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2233 lines
88 KiB
ObjectPascal
2233 lines
88 KiB
ObjectPascal
(*
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* copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of ffm.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*)
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unit ffm.avformat;
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{$i ffmpeg.inc}
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interface
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uses
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ffm.log, ffm.ctypes, ffm.libavcodec.avcodec, ffm.avio, ffm.frame, ffm.rational, ffm.dict, ffm.avutil;
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(*
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* @defgroup libavf I/O and Muxing/Demuxing Library
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* @{
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*
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* Libavformat (lavf) is a library for dealing with various media container
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* formats. Its main two purposes are demuxing - i.e. splitting a media file
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* into component streams, and the reverse process of muxing - writing supplied
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* data in a specified container format. It also has an @ref lavf_io
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* "I/O module" which supports a number of protocols for accessing the data (e.g.
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* file, tcp, http and others). Before using lavf, you need to call
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* av_register_all() to register all compiled muxers, demuxers and protocols.
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* Unless you are absolutely sure you won't use libavformat's network
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* capabilities, you should also call avformat_network_init().
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*
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* A supported input format is described by an AVInputFormat struct, conversely
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* an output format is described by AVOutputFormat. You can iterate over all
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* registered input/output formats using the av_iformat_next() /
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* av_oformat_next() functions. The protocols layer is not part of the public
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* API, so you can only get the names of supported protocols with the
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* avio_enum_protocols() function.
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*
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* Main lavf structure used for both muxing and demuxing is AVFormatContext,
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* which exports all information about the file being read or written. As with
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* most Libavformat structures, its size is not part of public ABI, so it cannot be
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* allocated on stack or directly with av_malloc(). To create an
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* AVFormatContext, use avformat_alloc_context() (some functions, like
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* avformat_open_input() might do that for you).
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*
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* Most importantly an AVFormatContext contains:
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* @li the @ref AVFormatContext.iformat "input" or @ref AVFormatContext.oformat
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* "output" format. It is either autodetected or set by user for input;
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* always set by user for output.
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* @li an @ref AVFormatContext.streams "array" of AVStreams, which describe all
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* elementary streams stored in the file. AVStreams are typically referred to
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* using their index in this array.
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* @li an @ref AVFormatContext.pb "I/O context". It is either opened by lavf or
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* set by user for input, always set by user for output (unless you are dealing
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* with an AVFMT_NOFILE format).
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*
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* @section lavf_options Passing options to (de)muxers
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* Lavf allows to configure muxers and demuxers using the @ref avoptions
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* mechanism. Generic (format-independent) libavformat options are provided by
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* AVFormatContext, they can be examined from a user program by calling
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* av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
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* from avformat_get_class()). Private (format-specific) options are provided by
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* AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
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* AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
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* Further options may be provided by the @ref AVFormatContext.pb "I/O context",
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* if its AVClass is non-NULL, and the protocols layer. See the discussion on
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* nesting in @ref avoptions documentation to learn how to access those.
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*
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* @defgroup lavf_decoding Demuxing
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* @{
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* Demuxers read a media file and split it into chunks of data (@em packets). A
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* @ref AVPacket "packet" contains one or more encoded frames which belongs to a
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* single elementary stream. In the lavf API this process is represented by the
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* avformat_open_input() function for opening a file, av_read_frame() for
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* reading a single packet and finally avformat_close_input(), which does the
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* cleanup.
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*
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* @section lavf_decoding_open Opening a media file
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* The minimum information required to open a file is its URL or filename, which
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* is passed to avformat_open_input(), as in the following code:
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* @code
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* const char *url = "in.mp3";
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* AVFormatContext *s = NULL;
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* int ret = avformat_open_input(&s, url, NULL, NULL);
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* if (ret < 0)
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* abort();
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* @endcode
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* The above code attempts to allocate an AVFormatContext, open the
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* specified file (autodetecting the format) and read the header, exporting the
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* information stored there into s. Some formats do not have a header or do not
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* store enough information there, so it is recommended that you call the
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* avformat_find_stream_info() function which tries to read and decode a few
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* frames to find missing information.
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*
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* In some cases you might want to preallocate an AVFormatContext yourself with
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* avformat_alloc_context() and do some tweaking on it before passing it to
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* avformat_open_input(). One such case is when you want to use custom functions
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* for reading input data instead of lavf internal I/O layer.
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* To do that, create your own AVIOContext with avio_alloc_context(), passing
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* your reading callbacks to it. Then set the @em pb field of your
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* AVFormatContext to newly created AVIOContext.
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*
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* Since the format of the opened file is in general not known until after
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* avformat_open_input() has returned, it is not possible to set demuxer private
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* options on a preallocated context. Instead, the options should be passed to
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* avformat_open_input() wrapped in an AVDictionary:
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* @code
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* AVDictionary *options = NULL;
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* av_dict_set(&options, "video_size", "640x480", 0);
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* av_dict_set(&options, "pixel_format", "rgb24", 0);
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*
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* if (avformat_open_input(&s, url, NULL, &options) < 0)
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* abort();
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* av_dict_free(&options);
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* @endcode
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* This code passes the private options 'video_size' and 'pixel_format' to the
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* demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
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* cannot know how to interpret raw video data otherwise. If the format turns
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* out to be something different than raw video, those options will not be
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* recognized by the demuxer and therefore will not be applied. Such unrecognized
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* options are then returned in the options dictionary (recognized options are
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* consumed). The calling program can handle such unrecognized options as it
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* wishes, e.g.
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* @code
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* AVDictionaryEntry *e;
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* if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
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* fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
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* abort();
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* }
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* @endcode
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*
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* After you have finished reading the file, you must close it with
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* avformat_close_input(). It will free everything associated with the file.
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*
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* @section lavf_decoding_read Reading from an opened file
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* Reading data from an opened AVFormatContext is done by repeatedly calling
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* av_read_frame() on it. Each call, if successful, will return an AVPacket
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* containing encoded data for one AVStream, identified by
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* AVPacket.stream_index. This packet may be passed straight into the libavcodec
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* decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
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* avcodec_decode_subtitle2() if the caller wishes to decode the data.
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*
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* AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
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* set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
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* pts/dts, 0 for duration) if the stream does not provide them. The timing
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* information will be in AVStream.time_base units, i.e. it has to be
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* multiplied by the timebase to convert them to seconds.
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*
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* If AVPacket.buf is set on the returned packet, then the packet is
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* allocated dynamically and the user may keep it indefinitely.
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* Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
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* static storage somewhere inside the demuxer and the packet is only valid
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* until the next av_read_frame() call or closing the file. If the caller
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* requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
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* of it.
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* In both cases, the packet must be freed with av_free_packet() when it is no
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* longer needed.
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*)
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// struct AVFormatContext;
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(*
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* @defgroup metadata_api Public Metadata API
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* @{
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* @ingroup libavf
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* The metadata API allows libavformat to export metadata tags to a client
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* application when demuxing. Conversely it allows a client application to
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* set metadata when muxing.
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*
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* Metadata is exported or set as pairs of key/value strings in the 'metadata'
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* fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
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* using the @ref lavu_dict "AVDictionary" API. Like all strings in FFmpeg,
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* metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
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* exported by demuxers isn't checked to be valid UTF-8 in most cases.
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*
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* Important concepts to keep in mind:
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* - Keys are unique; there can never be 2 tags with the same key. This is
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* also meant semantically, i.e., a demuxer should not knowingly produce
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* several keys that are literally different but semantically identical.
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* E.g., key=Author5, key=Author6. In this example, all authors must be
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* placed in the same tag.
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* - Metadata is flat, not hierarchical; there are no subtags. If you
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* want to store, e.g., the email address of the child of producer Alice
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* and actor Bob, that could have key=alice_and_bobs_childs_email_address.
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* - Several modifiers can be applied to the tag name. This is done by
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* appending a dash character ('-') and the modifier name in the order
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* they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
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* - language -- a tag whose value is localized for a particular language
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* is appended with the ISO 639-2/B 3-letter language code.
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* For example: Author-ger=Michael, Author-eng=Mike
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* The original/default language is in the unqualified "Author" tag.
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* A demuxer should set a default if it sets any translated tag.
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* - sorting -- a modified version of a tag that should be used for
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* sorting will have '-sort' appended. E.g. artist="The Beatles",
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* artist-sort="Beatles, The".
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*
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* - Demuxers attempt to export metadata in a generic format, however tags
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* with no generic equivalents are left as they are stored in the container.
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* Follows a list of generic tag names:
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*
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@verbatim
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album -- name of the set this work belongs to
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album_artist -- main creator of the set/album, if different from artist.
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e.g. "Various Artists" for compilation albums.
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artist -- main creator of the work
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comment -- any additional description of the file.
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composer -- who composed the work, if different from artist.
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copyright -- name of copyright holder.
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creation_time-- date when the file was created, preferably in ISO 8601.
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date -- date when the work was created, preferably in ISO 8601.
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disc -- number of a subset, e.g. disc in a multi-disc collection.
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encoder -- name/settings of the software/hardware that produced the file.
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encoded_by -- person/group who created the file.
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filename -- original name of the file.
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genre -- <self-evident>.
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language -- main language in which the work is performed, preferably
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in ISO 639-2 format. Multiple languages can be specified by
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separating them with commas.
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performer -- artist who performed the work, if different from artist.
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E.g for "Also sprach Zarathustra", artist would be "Richard
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Strauss" and performer "London Philharmonic Orchestra".
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publisher -- name of the label/publisher.
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service_name -- name of the service in broadcasting (channel name).
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service_provider -- name of the service provider in broadcasting.
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title -- name of the work.
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track -- number of this work in the set, can be in form current/total.
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variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
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@endverbatim
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*
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* Look in the examples section for an application example how to use the Metadata API.
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*
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* @}
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*)
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// * packet functions */
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(*
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* Allocate and read the payload of a packet and initialize its
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* fields with default values.
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*
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* @param pkt packet
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* @param size desired payload size
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* @return >0 (read size) if OK, AVERROR_xxx otherwise
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*)
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// int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
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(*
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* Read data and append it to the current content of the AVPacket.
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* If pkt->size is 0 this is identical to av_get_packet.
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* Note that this uses av_grow_packet and thus involves a realloc
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* which is inefficient. Thus this function should only be used
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* when there is no reasonable way to know (an upper bound of)
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* the final size.
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*
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* @param pkt packet
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* @param size amount of data to read
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* @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
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* will not be lost even if an error occurs.
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*)
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// int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
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(*
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***********************************************/
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// * fractional numbers for exact pts handling
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*)
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(*
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* The exact value of the fractional number is: 'val + num / den'.
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* num is assumed to be 0 <= num < den.
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*)
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Type
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TAVFrac = { packed } record
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val, num, den: int64_t;
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end;
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(* ***********************************************/
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* input/output formats
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*)
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const
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/// < score for file extension
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AVPROBE_SCORE_MAX = 100;
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AVPROBE_SCORE_RETRY = (AVPROBE_SCORE_MAX / 4);
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AVPROBE_SCORE_EXTENSION = 50;
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// < maximum score
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AVPROBE_PADDING_SIZE = 32; // < extra allocated bytes at the end of the probe buffer
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// Demuxer will use avio_open, no opened file should be provided by the caller.
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AVFMT_NOFILE = $0001;
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AVFMT_NEEDNUMBER = $0002; // **< Needs '%d' in filename. */
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AVFMT_SHOW_IDS = $0008; // **< Show format stream IDs numbers. */
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AVFMT_RAWPICTURE = $0020; // **< Format wants AVPicture structure for
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// raw picture data. */
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AVFMT_GLOBALHEADER = $0040; // **< Format wants global header. */
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AVFMT_NOTIMESTAMPS = $0080; // **< Format does not need / have any timestamps. */
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AVFMT_GENERIC_INDEX = $0100; // **< Use generic index building code. */
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AVFMT_TS_DISCONT = $0200;
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// **< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
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AVFMT_VARIABLE_FPS = $0400; // **< Format allows variable fps. */
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AVFMT_NODIMENSIONS = $0800; // **< Format does not need width/height */
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AVFMT_NOSTREAMS = $1000; // **< Format does not require any streams */
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AVFMT_NOBINSEARCH = $2000; // **< Format does not allow to fall back on binary search via read_timestamp */
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AVFMT_NOGENSEARCH = $4000; // **< Format does not allow to fall back on generic search */
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AVFMT_NO_BYTE_SEEK = $8000; // **< Format does not allow seeking by bytes */
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AVFMT_ALLOW_FLUSH = $10000;
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// **< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
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// #if LIBAVFORMAT_VERSION_MAJOR <= 54
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// #define AVFMT_TS_NONSTRICT $8020000 //we try to be compatible to the ABIs of ffmpeg and major forks
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// #else
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// #define AVFMT_TS_NONSTRICT $20000
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// #endif
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// /**< Format does not require strictly
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// increasing timestamps, but they must
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// still be monotonic */
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// #define AVFMT_TS_NEGATIVE $40000 /**< Format allows muxing negative
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// timestamps. If not set the timestamp
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// will be shifted in av_write_frame and
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// av_interleaved_write_frame so they
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// start from 0.
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// The user or muxer can override this through
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// AVFormatContext.avoid_negative_ts
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//
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// #define AVFMT_SEEK_TO_PTS $4000000 /**< Seeking is based on PTS */
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//
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AVFMT_FLAG_GENPTS = $0001;
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/// < Generate missing pts even if it requires parsing future frames.
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AVFMT_FLAG_IGNIDX = $0002;
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/// < Ignore index.
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AVFMT_FLAG_NONBLOCK = $0004;
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/// < Do not block when reading packets from input.
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AVFMT_FLAG_IGNDTS = $0008;
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/// < Ignore DTS on frames that contain both DTS & PTS
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AVFMT_FLAG_NOFILLIN = $0010;
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/// < Do not infer any values from other values, just return what is stored in the container
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AVFMT_FLAG_NOPARSE = $0020;
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/// < Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
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AVFMT_FLAG_NOBUFFER = $0040;
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/// < Do not buffer frames when possible
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AVFMT_FLAG_CUSTOM_IO = $0080;
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/// < The caller has supplied a custom AVIOContext, don't avio_close() it.
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AVFMT_FLAG_DISCARD_CORRUPT = $0100;
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/// < Discard frames marked corrupted
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AVFMT_FLAG_FLUSH_PACKETS = $0200;
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/// < Flush the AVIOContext every packet.
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AVFMT_FLAG_MP4A_LATM = $8000;
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/// < Enable RTP MP4A-LATM payload
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AVFMT_FLAG_SORT_DTS = $10000;
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/// < try to interleave outputted packets by dts (using this flag can slow demuxing down)
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AVFMT_FLAG_PRIV_OPT = $20000;
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/// < Enable use of private options by delaying codec open (this could be made default once all code is converted)
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AVFMT_FLAG_KEEP_SIDE_DATA = $40000;
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// < Don't merge side data but keep it separate.
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FF_FDEBUG_TS = $0001;
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MAX_STD_TIMEBASES = (60 * 12 + 6);
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MAX_PROBE_PACKETS = 2500;
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MAX_REORDER_DELAY = 16;
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//
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AVINDEX_KEYFRAME = $0001;
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//
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AV_DISPOSITION_DEFAULT = $0001;
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AV_DISPOSITION_DUB = $0002;
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AV_DISPOSITION_ORIGINAL = $0004;
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AV_DISPOSITION_COMMENT = $0008;
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AV_DISPOSITION_LYRICS = $0010;
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AV_DISPOSITION_KARAOKE = $0020;
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//
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AV_PROGRAM_RUNNING = 1;
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//
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AVFMTCTX_NOHEADER = $0001; (* < signal that no header is present
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(streams are added dynamically) *)
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//
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RAW_PACKET_BUFFER_SIZE = 2500000;
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type
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pAVFormatContext = ^TAVFormatContext;
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ppAVFormatContext = ^pAVFormatContext;
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ppAVCodecTag = ^pAVCodecTag;
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pAVCodecTag = Pointer;
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(*
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* This structure contains the data a format has to probe a file.
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*)
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pAVProbeData = ^TAVProbeData;
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TAVProbeData = { packed } record
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filename: pAnsiChar;
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buf: pByte; (* < Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. *)
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buf_size: Integer; (* < Size of buf except extra allocated bytes *)
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end;
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pAVOutputFormat = ^TAVOutputFormat;
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TAVOutputFormat = { packed } record
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name: pAnsiChar;
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(*
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* Descriptive name for the format, meant to be more human-readable
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|
* than name. You should use the NULL_IF_CONFIG_SMALL() macro
|
|
* to define it.
|
|
*)
|
|
long_name: pAnsiChar;
|
|
mime_type: pAnsiChar;
|
|
extensions: pAnsiChar; // **< comma-separated filename extensions */
|
|
// * output support */
|
|
audio_codec: TAVCodecID; // **< default audio codec */
|
|
video_codec: TAVCodecID; // **< default video codec */
|
|
subtitle_codec: TAVCodecID; // **< default subtitle codec */
|
|
(*
|
|
* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
|
|
* AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
|
|
* AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
|
|
* AVFMT_TS_NONSTRICT
|
|
*)
|
|
flags: Integer;
|
|
(*
|
|
* List of supported codec_id-codec_tag pairs, ordered by "better
|
|
* choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
|
|
*)
|
|
codec_tag: ppAVCodecTag;
|
|
priv_class: pAVClass; // < AVClass for the private context
|
|
|
|
(* ***************************************************************
|
|
* No fields below this line are part of the public API. They
|
|
* may not be used outside of libavformat and can be changed and
|
|
* removed at will.
|
|
* New public fields should be added right above.
|
|
*****************************************************************
|
|
*)
|
|
next: pAVOutputFormat;
|
|
(*
|
|
* size of private data so that it can be allocated in the wrapper
|
|
*)
|
|
priv_data_size: Integer;
|
|
// int (*write_header)(struct AVFormatContext *);
|
|
write_header: function(AV_FormatContext: pAVFormatContext): Integer; cdecl;
|
|
(*
|
|
* Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
|
|
* pkt can be NULL in order to flush data buffered in the muxer.
|
|
* When flushing, return 0 if there still is more data to flush,
|
|
* or 1 if everything was flushed and there is no more buffered
|
|
* data.
|
|
*)
|
|
// int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
|
|
write_packet: function(AVFormatContext: pAVFormatContext; pkt: pAVPacket): Integer; cdecl;
|
|
// int (*write_trailer)(struct AVFormatContext *);
|
|
write_trailer: function(AVFormatContext: pAVFormatContext): Integer; cdecl;
|
|
(*
|
|
* Currently only used to set pixel format if not YUV420P.
|
|
*)
|
|
// int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
|
|
interleave_packet: function(AVFormatContext: pAVFormatContext; AVPacket_out: pAVPacket; AVPacket_in: pAVPacket;
|
|
flush: Integer): Integer; cdecl;
|
|
(*
|
|
* Test if the given codec can be stored in this container.
|
|
*
|
|
* @return 1 if the codec is supported, 0 if it is not.
|
|
* A negative number if unknown.
|
|
* MKTAG('A', 'P', 'I', 'C') if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC
|
|
*)
|
|
// int (*query_codec)(enum AVCodecID id, int std_compliance);
|
|
query_codec: function(id: TAVCodecID; std_compliance: Integer): Integer; cdecl;
|
|
// void (*get_output_timestamp)(struct AVFormatContext *s, int stream, int64_t *dts, int64_t *wall);
|
|
get_output_timestamp: procedure(s: pAVFormatContext; stream: Integer; dts: pint64_t; wall: pint64_t); cdecl;
|
|
end;
|
|
|
|
pAVInputFormat = ^TAVInputFormat;
|
|
|
|
TAVInputFormat = { packed } record
|
|
(*
|
|
* A comma separated list of short names for the format. New names
|
|
* may be appended with a minor bump.
|
|
*)
|
|
name: pAnsiChar;
|
|
(*
|
|
* Descriptive name for the format, meant to be more human-readable
|
|
* than name. You should use the NULL_IF_CONFIG_SMALL() macro
|
|
* to define it.
|
|
*)
|
|
long_name: pAnsiChar;
|
|
(*
|
|
* Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
|
|
* AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
|
|
* AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
|
|
*)
|
|
flags: Integer;
|
|
(*
|
|
* If extensions are defined, then no probe is done. You should
|
|
* usually not use extension format guessing because it is not
|
|
* reliable enough
|
|
*)
|
|
extensions: pAnsiChar;
|
|
codec_tag: ppAVCodecTag;
|
|
priv_class: pAVClass; // < AVClass for the private context
|
|
(*
|
|
*****************************************************************
|
|
* No fields below this line are part of the public API. They
|
|
* may not be used outside of libavformat and can be changed and
|
|
* removed at will.
|
|
* New public fields should be added right above.
|
|
*****************************************************************
|
|
*)
|
|
next: pAVInputFormat;
|
|
(*
|
|
* Raw demuxers store their codec ID here.
|
|
*)
|
|
raw_codec_id: Integer;
|
|
(*
|
|
* Size of private data so that it can be allocated in the wrapper.
|
|
*)
|
|
priv_data_size: Integer;
|
|
(*
|
|
* Tell if a given file has a chance of being parsed as this format.
|
|
* The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
|
|
* big so you do not have to check for that unless you need more.
|
|
*)
|
|
// int (* read_probe)(AVProbeData *);
|
|
read_probe: function(AV_ProbeData: pAVProbeData): Integer; cdecl;
|
|
(*
|
|
* Read the format header and initialize the AVFormatContext
|
|
* structure. Return 0 if OK. Only used in raw format right
|
|
* now. 'avformat_new_stream' should be called to create new streams.
|
|
*)
|
|
// int (*read_header)(struct AVFormatContext *);
|
|
read_header: function(AV_FormatContext: pAVFormatContext): Integer; cdecl;
|
|
(*
|
|
* Read one packet and put it in 'pkt'. pts and flags are also
|
|
* set. 'avformat_new_stream' can be called only if the flag
|
|
* AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
|
|
* background thread).
|
|
* @return 0 on success, < 0 on error.
|
|
* When returning an error, pkt must not have been allocated
|
|
* or must be freed before returning
|
|
*)
|
|
// int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
|
|
read_packet: function(AV_FormatContext: pAVFormatContext; pkt: pAVPacket): Integer; cdecl;
|
|
(*
|
|
* Close the stream. The AVFormatContext and AVStreams are not
|
|
* freed by this function
|
|
*)
|
|
// int (*read_close)(struct AVFormatContext *);
|
|
read_close: function(AV_FormatContext: pAVFormatContext): Integer; cdecl;
|
|
(*
|
|
* Seek to a given timestamp relative to the frames in
|
|
* stream component stream_index.
|
|
* @param stream_index Must not be -1.
|
|
* @param flags Selects which direction should be preferred if no exact
|
|
* match is available.
|
|
* @return >= 0 on success (but not necessarily the new offset)
|
|
*)
|
|
// int (*read_seek)(struct AVFormatContext *, int stream_index, int64_t timestamp, int flags);
|
|
read_seek: function(AV_FormatContext: pAVFormatContext; stream_index: Integer; timestamp: int64_t; flags: Integer)
|
|
: Integer; cdecl;
|
|
(*
|
|
* Get the next timestamp in stream[stream_index].time_base units.
|
|
* @return the timestamp or AV_NOPTS_VALUE if an error occurred
|
|
*)
|
|
// int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index, int64_t *pos, int64_t pos_limit);
|
|
read_timestamp: function(s: pAVFormatContext; stream_index: Integer; pos: pint64_t; pos_limit: int64_t)
|
|
: int64_t; cdecl;
|
|
(*
|
|
* Start/resume playing - only meaningful if using a network-based format
|
|
* (RTSP).
|
|
*)
|
|
read_play: function(AV_FormatContext: pAVFormatContext): Integer; cdecl;
|
|
(*
|
|
* Pause playing - only meaningful if using a network-based format
|
|
* (RTSP).
|
|
*)
|
|
read_pause: function(AV_FormatContext: pAVFormatContext): Integer; cdecl;
|
|
(*
|
|
* Seek to timestamp ts.
|
|
* Seeking will be done so that the point from which all active streams
|
|
* can be presented successfully will be closest to ts and within min/max_ts.
|
|
* Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
|
|
*)
|
|
// int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
|
|
read_seek2: function(s: pAVFormatContext; stream_index: Integer; min_ts: int64_t; ts: int64_t; max_ts: int64_t;
|
|
flags: Integer): Integer; cdecl;
|
|
end;
|
|
|
|
TAVStreamParseType = ( //
|
|
AVSTREAM_PARSE_NONE, AVSTREAM_PARSE_FULL, // **< full parsing and repack */
|
|
AVSTREAM_PARSE_HEADERS, // **< Only parse headers, do not repack. */
|
|
AVSTREAM_PARSE_TIMESTAMPS,
|
|
// **< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
|
|
AVSTREAM_PARSE_FULL_ONCE,
|
|
// **< full parsing and repack of the first frame only, only implemented for H.264 currently */
|
|
AVSTREAM_PARSE_FULL_RAW = $57415230 // MKTAG(0,'R','A','W')
|
|
(* < full parsing and repack with timestamp and position generation by parser for raw
|
|
this assumes that each packet in the file contains no demuxer level headers and
|
|
just codec level data, otherwise position generation would fail *)
|
|
);
|
|
pAVIndexEntry = ^TAVIndexEntry;
|
|
|
|
TAVIndexEntry = { packed } record
|
|
pos: int64_t;
|
|
timestamp: int64_t;
|
|
// * Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are available
|
|
// * when seeking to this entry. That means preferable PTS on keyframe based formats.
|
|
// * But demuxers can choose to store a different timestamp, if it is more convenient for the implementation or nothing better
|
|
// * is known
|
|
// int flags:2;
|
|
// int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
|
|
flag_size: int32;
|
|
min_distance: Integer;
|
|
(* < Minimum distance between this and the previous keyframe, used to avoid unneeded searching. *)
|
|
end;
|
|
(*
|
|
* Track should be used during playback by default.
|
|
* Useful for subtitle track that should be displayed
|
|
* even when user did not explicitly ask for subtitles.
|
|
*)
|
|
// #define AV_DISPOSITION_FORCED $0040
|
|
// #define AV_DISPOSITION_HEARING_IMPAIRED $0080 /**< stream for hearing impaired audiences */
|
|
// #define AV_DISPOSITION_VISUAL_IMPAIRED $0100 /**< stream for visual impaired audiences */
|
|
// #define AV_DISPOSITION_CLEAN_EFFECTS $0200 /**< stream without voice */
|
|
(*
|
|
// * The stream is stored in the file as an attached picture/"cover art" (e.g.
|
|
// * APIC frame in ID3v2). The single packet associated with it will be returned
|
|
// * among the first few packets read from the file unless seeking takes place.
|
|
// * It can also be accessed at any time in AVStream.attached_pic.
|
|
*)
|
|
// #define AV_DISPOSITION_ATTACHED_PIC $0400
|
|
//
|
|
(*
|
|
// * To specify text track kind (different from subtitles default).
|
|
*)
|
|
// #define AV_DISPOSITION_CAPTIONS $10000
|
|
// #define AV_DISPOSITION_DESCRIPTIONS $20000
|
|
// #define AV_DISPOSITION_METADATA $40000
|
|
//
|
|
(*
|
|
// * Options for behavior on timestamp wrap detection.
|
|
*)
|
|
// #define AV_PTS_WRAP_IGNORE 0 ///< ignore the wrap
|
|
// #define AV_PTS_WRAP_ADD_OFFSET 1 ///< add the format specific offset on wrap detection
|
|
// #define AV_PTS_WRAP_SUB_OFFSET -1 ///< subtract the format specific offset on wrap detection
|
|
//
|
|
(*
|
|
// * Stream structure.
|
|
// * New fields can be added to the end with minor version bumps.
|
|
// * Removal, reordering and changes to existing fields require a major
|
|
// * version bump.
|
|
// * sizeof(AVStream) must not be used outside libav*.
|
|
*)
|
|
|
|
TDuration_error = array [0 .. 1, 0 .. MAX_STD_TIMEBASES - 1] of double;
|
|
pDuration_error = ^TDuration_error;
|
|
|
|
pInfo = ^TInfo;
|
|
|
|
TInfo = { packed } record
|
|
last_dts: int64_t;
|
|
duration_gcd: int64_t;
|
|
duration_count: Integer;
|
|
duration_error: pDuration_error;
|
|
codec_info_duration: int64_t;
|
|
codec_info_duration_fields: int64_t;
|
|
found_decoder: Integer;
|
|
last_duration: int64_t;
|
|
(*
|
|
* Those are used for average framerate estimation.
|
|
*)
|
|
fps_first_dts: int64_t;
|
|
fps_first_dts_idx: Integer;
|
|
fps_last_dts: int64_t;
|
|
fps_last_dts_idx: Integer;
|
|
end;
|
|
|
|
pAVPacketList = ^TAVPacketList;
|
|
|
|
pAVStream = ^TAVStream;
|
|
ppAVStream = ^pAVStream;
|
|
|
|
TAVStream = { packed } record
|
|
index: Integer; // **< stream index in AVFormatContext */
|
|
(*
|
|
* Format-specific stream ID.
|
|
* decoding: set by libavformat
|
|
* encoding: set by the user, replaced by libavformat if left unset
|
|
*)
|
|
id: Integer;
|
|
(*
|
|
* Codec context associated with this stream. Allocated and freed by
|
|
* libavformat.
|
|
*
|
|
* - decoding: The demuxer exports codec information stored in the headers
|
|
* here.
|
|
* - encoding: The user sets codec information, the muxer writes it to the
|
|
* output. Mandatory fields as specified in AVCodecContext
|
|
* documentation must be set even if this AVCodecContext is
|
|
* not actually used for encoding.
|
|
*)
|
|
codec: pAVCodecContext;
|
|
priv_data: Pointer;
|
|
(*
|
|
* encoding: pts generation when outputting stream
|
|
*)
|
|
pts: TAVFrac;
|
|
(*
|
|
* This is the fundamental unit of time (in seconds) in terms
|
|
* of which frame timestamps are represented.
|
|
*
|
|
* decoding: set by libavformat
|
|
* encoding: set by libavformat in avformat_write_header. The muxer may use the
|
|
* user-provided value of @ref AVCodecContext.time_base "codec->time_base"
|
|
* as a hint.
|
|
*)
|
|
time_base: TAVRational;
|
|
(*
|
|
* Decoding: pts of the first frame of the stream in presentation order, in stream time base.
|
|
* Only set this if you are absolutely 100% sure that the value you set
|
|
* it to really is the pts of the first frame.
|
|
* This may be undefined (AV_NOPTS_VALUE).
|
|
* @note The ASF header does NOT contain a correct start_time the ASF
|
|
* demuxer must NOT set this.
|
|
*)
|
|
start_time: int64_t;
|
|
(*
|
|
* Decoding: duration of the stream, in stream time base.
|
|
* If a source file does not specify a duration, but does specify
|
|
* a bitrate, this value will be estimated from bitrate and file size.
|
|
*)
|
|
duration: int64_t;
|
|
nb_frames: int64_t; // < number of frames in this stream if known or 0
|
|
disposition: Integer; // **< AV_DISPOSITION_* bit field */
|
|
discard: TAVDiscard;
|
|
/// < Selects which packets can be discarded at will and do not need to be demuxed.
|
|
(*
|
|
* sample aspect ratio (0 if unknown)
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavformat.
|
|
*)
|
|
sample_aspect_ratio: TAVRational;
|
|
metadata: pAVDictionary;
|
|
(*
|
|
* Average framerate
|
|
*)
|
|
avg_frame_rate: TAVRational;
|
|
(*
|
|
* For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
|
|
* will contain the attached picture.
|
|
*
|
|
* decoding: set by libavformat, must not be modified by the caller.
|
|
* encoding: unused
|
|
*)
|
|
attached_pic: TAVPacket;
|
|
(* ***************************************************************
|
|
* All fields below this line are not part of the public API. They
|
|
* may not be used outside of libavformat and can be changed and
|
|
* removed at will.
|
|
* New public fields should be added right above.
|
|
*****************************************************************
|
|
*)
|
|
(*
|
|
* Stream information used internally by av_find_stream_info()
|
|
*)
|
|
// #define MAX_STD_TIMEBASES (60*12+6)
|
|
Info: pInfo;
|
|
pts_wrap_bits: Integer; // **< number of bits in pts (used for wrapping control) */
|
|
{$IFDEF FF_API_REFERENCE_DTS}
|
|
// * a hack to keep ABI compatibility for ffmpeg and other applications, which accesses parser even
|
|
// * though it should not */
|
|
do_not_use: int64_t;
|
|
{$ENDIF}
|
|
// Timestamp generation support:
|
|
(*
|
|
* Timestamp corresponding to the last dts sync point.
|
|
*
|
|
* Initialized when AVCodecParserContext.dts_sync_point >= 0 and
|
|
* a DTS is received from the underlying container. Otherwise set to
|
|
* AV_NOPTS_VALUE by default.
|
|
*)
|
|
first_dts: int64_t;
|
|
cur_dts: int64_t;
|
|
last_IP_pts: int64_t;
|
|
last_IP_duration: Integer;
|
|
(*
|
|
* Number of packets to buffer for codec probing
|
|
*)
|
|
// #define MAX_PROBE_PACKETS 2500
|
|
probe_packets: Integer;
|
|
(*
|
|
* Number of frames that have been demuxed during av_find_stream_info()
|
|
*)
|
|
codec_info_nb_frames: Integer;
|
|
|
|
// * av_read_frame() support */
|
|
need_parsing: TAVStreamParseType;
|
|
parser: pAVCodecParserContext;
|
|
(*
|
|
* last packet in packet_buffer for this stream when muxing.
|
|
*)
|
|
last_in_packet_buffer: pAVPacketList;
|
|
probe_data: TAVProbeData;
|
|
// #define MAX_REORDER_DELAY 16
|
|
pts_buffer: array [0 .. MAX_REORDER_DELAY] of int64_t;
|
|
index_entries: pAVIndexEntry; (* < Only used if the format does not
|
|
support seeking natively. *)
|
|
nb_index_entries: Integer;
|
|
index_entries_allocated_size: Cardinal;
|
|
(*
|
|
* Real base framerate of the stream.
|
|
* This is the lowest framerate with which all timestamps can be
|
|
* represented accurately (it is the least common multiple of all
|
|
* framerates in the stream). Note, this value is just a guess!
|
|
* For example, if the time base is 1/90000 and all frames have either
|
|
* approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
|
|
*
|
|
* Code outside avformat should access this field using:
|
|
* av_stream_get/set_r_frame_rate(stream)
|
|
*)
|
|
r_frame_rate: TAVRational;
|
|
(*
|
|
* Stream Identifier
|
|
* This is the MPEG-TS stream identifier +1
|
|
* 0 means unknown
|
|
*)
|
|
stream_identifier: Integer;
|
|
|
|
interleaver_chunk_size: int64_t;
|
|
interleaver_chunk_duration: int64_t;
|
|
|
|
(*
|
|
* stream probing state
|
|
* -1 -> probing finished
|
|
* 0 -> no probing requested
|
|
* rest -> perform probing with request_probe being the minimum score to accept.
|
|
* NOT PART OF PUBLIC API
|
|
*)
|
|
request_probe: Integer;
|
|
(*
|
|
* Indicates that everything up to the next keyframe
|
|
* should be discarded.
|
|
*)
|
|
skip_to_keyframe: Integer;
|
|
(*
|
|
* Number of samples to skip at the start of the frame decoded from the next packet.
|
|
*)
|
|
skip_samples: Integer;
|
|
(*
|
|
* Number of internally decoded frames, used internally in libavformat, do not access
|
|
* its lifetime differs from info which is why it is not in that structure.
|
|
*)
|
|
nb_decoded_frames: Integer;
|
|
(*
|
|
* Timestamp offset added to timestamps before muxing
|
|
* NOT PART OF PUBLIC API
|
|
*)
|
|
mux_ts_offset: int64_t;
|
|
(*
|
|
* Internal data to check for wrapping of the time stamp
|
|
*)
|
|
pts_wrap_reference: int64_t;
|
|
(*
|
|
* Options for behavior, when a wrap is detected.
|
|
*
|
|
* Defined by AV_PTS_WRAP_ values.
|
|
*
|
|
* If correction is enabled, there are two possibilities:
|
|
* If the first time stamp is near the wrap point, the wrap offset
|
|
* will be subtracted, which will create negative time stamps.
|
|
* Otherwise the offset will be added.
|
|
*)
|
|
pts_wrap_behavior: Integer;
|
|
end;
|
|
|
|
// AVRational av_stream_get_r_frame_rate(const AVStream *s);
|
|
// void av_stream_set_r_frame_rate(AVStream *s, AVRational r);
|
|
|
|
(*
|
|
* New fields can be added to the end with minor version bumps.
|
|
* Removal, reordering and changes to existing fields require a major
|
|
* version bump.
|
|
* sizeof(AVProgram) must not be used outside libav*.
|
|
*)
|
|
pAVProgram = ^TAVProgram;
|
|
ppAVProgram = ^pAVProgram;
|
|
|
|
TAVProgram = { packed } record
|
|
id: Integer;
|
|
flags: Integer;
|
|
discard: TAVDiscard;
|
|
/// < selects which program to discard and which to feed to the caller
|
|
stream_index: pCardinal;
|
|
nb_stream_indexes: Cardinal;
|
|
metadata: pAVDictionary;
|
|
program_num: Integer;
|
|
pmt_pid: Integer;
|
|
pcr_pid: Integer;
|
|
(* ***************************************************************
|
|
* All fields below this line are not part of the public API. They
|
|
* may not be used outside of libavformat and can be changed and
|
|
* removed at will.
|
|
* New public fields should be added right above.
|
|
*****************************************************************
|
|
*)
|
|
start_time: int64_t;
|
|
end_time: int64_t;
|
|
pts_wrap_reference: int64_t;
|
|
/// < reference dts for wrap detection
|
|
pts_wrap_behavior: Integer;
|
|
/// < behavior on wrap detection
|
|
end;
|
|
|
|
pAVChapter = ^TAVChapter;
|
|
ppAVChapter = ^pAVChapter;
|
|
|
|
TAVChapter = { packed } record
|
|
id: Integer;
|
|
/// < unique ID to identify the chapter
|
|
time_base: TAVRational;
|
|
/// < time base in which the start/end timestamps are specified
|
|
start, _end: int64_t;
|
|
/// < chapter start/end time in time_base units
|
|
metadata: pAVDictionary;
|
|
end;
|
|
(*
|
|
// * The duration of a video can be estimated through various ways, and this enum can be used
|
|
// * to know how the duration was estimated.
|
|
*)
|
|
|
|
TAVDurationEstimationMethod = ( //
|
|
AVFMT_DURATION_FROM_PTS,
|
|
/// < Duration accurately estimated from PTSes
|
|
AVFMT_DURATION_FROM_STREAM,
|
|
/// < Duration estimated from a stream with a known duration
|
|
AVFMT_DURATION_FROM_BITRATE
|
|
/// < Duration estimated from bitrate (less accurate)
|
|
);
|
|
|
|
(* *
|
|
* Format I/O context.
|
|
* New fields can be added to the end with minor version bumps.
|
|
* Removal, reordering and changes to existing fields require a major
|
|
* version bump.
|
|
* sizeof(AVFormatContext) must not be used outside libav*, use
|
|
* avformat_alloc_context() to create an AVFormatContext.
|
|
*)
|
|
|
|
TAVFormatContext = { packed } record
|
|
(*
|
|
* A class for logging and AVOptions. Set by avformat_alloc_context().
|
|
* Exports (de)muxer private options if they exist.
|
|
*)
|
|
av_class: pAVClass;
|
|
(*
|
|
* Can only be iformat or oformat, not both at the same time.
|
|
*
|
|
* decoding: set by avformat_open_input().
|
|
* encoding: set by the user.
|
|
*)
|
|
iformat: pAVInputFormat; //
|
|
oformat: pAVOutputFormat;
|
|
(*
|
|
* Format private data. This is an AVOptions-enabled struct
|
|
* if and only if iformat/oformat.priv_class is not NULL.
|
|
*)
|
|
priv_data: Pointer;
|
|
(*
|
|
* I/O context.
|
|
*
|
|
* decoding: either set by the user before avformat_open_input() (then
|
|
* the user must close it manually) or set by avformat_open_input().
|
|
* encoding: set by the user.
|
|
*
|
|
* Do NOT set this field if AVFMT_NOFILE flag is set in
|
|
* iformat/oformat.flags. In such a case, the (de)muxer will handle
|
|
* I/O in some other way and this field will be NULL.
|
|
*)
|
|
pb: pAVIOContext;
|
|
|
|
(* stream info *)
|
|
ctx_flags: Integer; // **< Format-specific flags, see AVFMTCTX_xx */
|
|
|
|
(*
|
|
* A list of all streams in the file. New streams are created with
|
|
* avformat_new_stream().
|
|
*
|
|
* decoding: streams are created by libavformat in avformat_open_input().
|
|
* If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
|
|
* appear in av_read_frame().
|
|
* encoding: streams are created by the user before avformat_write_header().
|
|
*)
|
|
nb_streams: Cardinal;
|
|
streams: ppAVStream; //
|
|
filename: array [0 .. 1023] of AnsiChar; // <input or output filename //
|
|
(*
|
|
* Decoding: position of the first frame of the component, in
|
|
* AV_TIME_BASE fractional seconds. NEVER set this value directly:
|
|
* It is deduced from the AVStream values.
|
|
*)
|
|
start_time: int64_t;
|
|
(*
|
|
* Decoding: duration of the stream, in AV_TIME_BASE fractional
|
|
* seconds. Only set this value if you know none of the individual stream
|
|
* durations and also do not set any of them. This is deduced from the
|
|
* AVStream values if not set.
|
|
*)
|
|
duration: int64_t;
|
|
(*
|
|
* Decoding: total stream bitrate in bit/s, 0 if not
|
|
* available. Never set it directly if the file_size and the
|
|
* duration are known as FFmpeg can compute it automatically.
|
|
*)
|
|
bit_rate: Integer;
|
|
packet_size: Cardinal;
|
|
max_delay: Integer;
|
|
flags: Integer;
|
|
(*
|
|
// * decoding: size of data to probe; encoding: unused.
|
|
*)
|
|
probesize: Cardinal;
|
|
(*
|
|
// * decoding: maximum time (in AV_TIME_BASE units) during which the input should
|
|
// * be analyzed in avformat_find_stream_info().
|
|
*)
|
|
max_analyze_duration: Integer;
|
|
key: pByte;
|
|
keylen: Integer;
|
|
nb_programs: Cardinal;
|
|
programs: ppAVProgram;
|
|
(*
|
|
* Forced video codec_id.
|
|
* Demuxing: Set by user.
|
|
*)
|
|
video_codec_id: TAVCodecID;
|
|
(*
|
|
* Forced audio codec_id.
|
|
* Demuxing: Set by user.
|
|
*)
|
|
audio_codec_id: TAVCodecID;
|
|
(*
|
|
* Forced subtitle codec_id.
|
|
* Demuxing: Set by user.
|
|
*)
|
|
subtitle_codec_id: TAVCodecID;
|
|
(*
|
|
* Maximum amount of memory in bytes to use for the index of each stream.
|
|
* If the index exceeds this size, entries will be discarded as
|
|
* needed to maintain a smaller size. This can lead to slower or less
|
|
* accurate seeking (depends on demuxer).
|
|
* Demuxers for which a full in-memory index is mandatory will ignore
|
|
* this.
|
|
* muxing : unused
|
|
* demuxing: set by user
|
|
*)
|
|
max_index_size: Cardinal;
|
|
(*
|
|
* Maximum amount of memory in bytes to use for buffering frames
|
|
* obtained from realtime capture devices.
|
|
*)
|
|
max_picture_buffer: Cardinal;
|
|
(*
|
|
* Number of chapters in AVChapter array.
|
|
* When muxing, chapters are normally written in the file header,
|
|
* so nb_chapters should normally be initialized before write_header
|
|
* is called. Some muxers (e.g. mov and mkv) can also write chapters
|
|
* in the trailer. To write chapters in the trailer, nb_chapters
|
|
* must be zero when write_header is called and non-zero when
|
|
* write_trailer is called.
|
|
* muxing : set by user
|
|
* demuxing: set by libavformat
|
|
*)
|
|
nb_chapters: Cardinal;
|
|
chapters: ppAVChapter;
|
|
metadata: pAVDictionary;
|
|
(*
|
|
* Start time of the stream in real world time, in microseconds
|
|
* since the unix epoch (00:00 1st January 1970). That is, pts=0
|
|
* in the stream was captured at this real world time.
|
|
* - encoding: Set by user.
|
|
* - decoding: Unused.
|
|
*)
|
|
start_time_realtime: int64_t;
|
|
(*
|
|
* decoding: number of frames used to probe fps
|
|
*)
|
|
fps_probe_size: Integer;
|
|
(*
|
|
* Error recognition; higher values will detect more errors but may
|
|
* misdetect some more or less valid parts as errors.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*)
|
|
error_recognition: Integer;
|
|
(*
|
|
* Custom interrupt callbacks for the I/O layer.
|
|
*
|
|
* decoding: set by the user before avformat_open_input().
|
|
* encoding: set by the user before avformat_write_header()
|
|
* (mainly useful for AVFMT_NOFILE formats). The callback
|
|
* should also be passed to avio_open2() if it's used to
|
|
* open the file.
|
|
*)
|
|
interrupt_callback: TAVIOInterruptCB;
|
|
(*
|
|
* Flags to enable debugging.
|
|
*)
|
|
debug: Integer;
|
|
(*
|
|
* Transport stream id.
|
|
* This will be moved into demuxer private options. Thus no API/ABI compatibility
|
|
*)
|
|
// int ts_id;
|
|
ts_id: Integer;
|
|
(*
|
|
* Audio preload in microseconds.
|
|
* Note, not all formats support this and unpredictable things may happen if it is used when not supported.
|
|
* - encoding: Set by user via AVOptions (NO direct access)
|
|
* - decoding: unused
|
|
*)
|
|
// int audio_preload;
|
|
audio_preload: Integer;
|
|
(*
|
|
* Max chunk time in microseconds.
|
|
* Note, not all formats support this and unpredictable things may happen if it is used when not supported.
|
|
* - encoding: Set by user via AVOptions (NO direct access)
|
|
* - decoding: unused
|
|
*)
|
|
// int max_chunk_duration;
|
|
max_chunk_duration: Integer;
|
|
(*
|
|
* Max chunk size in bytes
|
|
* Note, not all formats support this and unpredictable things may happen if it is used when not supported.
|
|
* - encoding: Set by user via AVOptions (NO direct access)
|
|
* - decoding: unused
|
|
*)
|
|
// int max_chunk_size;
|
|
max_chunk_size: Integer;
|
|
(*
|
|
* forces the use of wallclock timestamps as pts/dts of packets
|
|
* This has undefined results in the presence of B frames.
|
|
* - encoding: unused
|
|
* - decoding: Set by user via AVOptions (NO direct access)
|
|
*)
|
|
// int use_wallclock_as_timestamps;
|
|
use_wallclock_as_timestamps: Integer;
|
|
(*
|
|
* Avoid negative timestamps during muxing.
|
|
* 0 -> allow negative timestamps
|
|
* 1 -> avoid negative timestamps
|
|
* -1 -> choose automatically (default)
|
|
* Note, this only works when interleave_packet_per_dts is in use.
|
|
* - encoding: Set by user via AVOptions (NO direct access)
|
|
* - decoding: unused
|
|
*)
|
|
// int avoid_negative_ts;
|
|
avoid_negative_ts: Integer;
|
|
(*
|
|
* avio flags, used to force AVIO_FLAG_DIRECT.
|
|
* - encoding: unused
|
|
* - decoding: Set by user via AVOptions (NO direct access)
|
|
*)
|
|
// int avio_flags;
|
|
avio_flags: Integer;
|
|
(*
|
|
* The duration field can be estimated through various ways, and this field can be used
|
|
* to know how the duration was estimated.
|
|
* - encoding: unused
|
|
* - decoding: Read by user via AVOptions (NO direct access)
|
|
*)
|
|
// enum AVDurationEstimationMethod duration_estimation_method;
|
|
duration_estimation_method: TAVDurationEstimationMethod;
|
|
(*
|
|
* Skip initial bytes when opening stream
|
|
* - encoding: unused
|
|
* - decoding: Set by user via AVOptions (NO direct access)
|
|
*)
|
|
// unsigned int skip_initial_bytes;
|
|
skip_initial_bytes: Cardinal;
|
|
(*
|
|
* Correct single timestamp overflows
|
|
* - encoding: unused
|
|
* - decoding: Set by user via AVOPtions (NO direct access)
|
|
*)
|
|
// unsigned int correct_ts_overflow;
|
|
correct_ts_overflow: Cardinal;
|
|
(*
|
|
* Force seeking to any (also non key) frames.
|
|
* - encoding: unused
|
|
* - decoding: Set by user via AVOPtions (NO direct access)
|
|
*)
|
|
// int seek2any;
|
|
seek2any: Integer;
|
|
(*
|
|
* Flush the I/O context after each packet.
|
|
* - encoding: Set by user via AVOptions (NO direct access)
|
|
* - decoding: unused
|
|
*)
|
|
// int flush_packets;
|
|
flush_packets: Integer;
|
|
(*
|
|
* format probing score.
|
|
* The maximal score is AVPROBE_SCORE_MAX, its set when the demuxer probes
|
|
* the format.
|
|
* - encoding: unused
|
|
* - decoding: set by avformat, read by user via av_format_get_probe_score() (NO direct access)
|
|
*)
|
|
// int probe_score;
|
|
probe_score: Integer;
|
|
(* ***************************************************************
|
|
* All fields below this line are not part of the public API. They
|
|
* may not be used outside of libavformat and can be changed and
|
|
* removed at will.
|
|
* New public fields should be added right above.
|
|
*****************************************************************
|
|
*)
|
|
|
|
(*
|
|
* This buffer is only needed when packets were already buffered but
|
|
* not decoded, for example to get the codec parameters in MPEG
|
|
* streams.
|
|
*)
|
|
// struct AVPacketList *packet_buffer;
|
|
packet_buffer: pAVPacketList;
|
|
// struct AVPacketList *packet_buffer_end;
|
|
packet_buffer_end: pAVPacketList;
|
|
|
|
(* av_seek_frame() support *)
|
|
// int64_t data_offset; /**< offset of the first packet */
|
|
data_offset: int64_t;
|
|
|
|
(*
|
|
* Raw packets from the demuxer, prior to parsing and decoding.
|
|
* This buffer is used for buffering packets until the codec can
|
|
* be identified, as parsing cannot be done without knowing the
|
|
* codec.
|
|
*)
|
|
// struct AVPacketList *raw_packet_buffer;
|
|
raw_packet_buffer: pAVPacketList;
|
|
// struct AVPacketList *raw_packet_buffer_end;
|
|
raw_packet_buffer_end: pAVPacketList;
|
|
(*
|
|
* Packets split by the parser get queued here.
|
|
*)
|
|
// struct AVPacketList *parse_queue;
|
|
parse_queue: pAVPacketList;
|
|
// struct AVPacketList *parse_queue_end;
|
|
parse_queue_end: pAVPacketList;
|
|
(*
|
|
* Remaining size available for raw_packet_buffer, in bytes.
|
|
*)
|
|
// #define RAW_PACKET_BUFFER_SIZE 2500000
|
|
// int raw_packet_buffer_remaining_size;
|
|
raw_packet_buffer_remaining_size: Integer;
|
|
|
|
(*
|
|
* Offset to remap timestamps to be non-negative.
|
|
* Expressed in timebase units.
|
|
* @see AVStream.mux_ts_offset
|
|
*)
|
|
// int64_t offset;
|
|
offset: int64_t;
|
|
|
|
(*
|
|
* Timebase for the timestamp offset.
|
|
*)
|
|
// AVRational offset_timebase;
|
|
offset_timebase: TAVRational;
|
|
|
|
(*
|
|
* IO repositioned flag.
|
|
* This is set by avformat when the underlaying IO context read pointer
|
|
* is repositioned, for example when doing byte based seeking.
|
|
* Demuxers can use the flag to detect such changes.
|
|
*)
|
|
// int io_repositioned;
|
|
io_repositioned: Integer;
|
|
|
|
(*
|
|
* Forced video codec.
|
|
* This allows forcing a specific decoder, even when there are multiple with
|
|
* the same codec_id.
|
|
* Demuxing: Set by user via av_format_set_video_codec (NO direct access).
|
|
*)
|
|
// AVCodec *video_codec;
|
|
video_codec: pAVCodec;
|
|
|
|
(*
|
|
* Forced audio codec.
|
|
* This allows forcing a specific decoder, even when there are multiple with
|
|
* the same codec_id.
|
|
* Demuxing: Set by user via av_format_set_audio_codec (NO direct access).
|
|
*)
|
|
// AVCodec *audio_codec;
|
|
audio_codec: pAVCodec;
|
|
|
|
(*
|
|
* Forced subtitle codec.
|
|
* This allows forcing a specific decoder, even when there are multiple with
|
|
* the same codec_id.
|
|
* Demuxing: Set by user via av_format_set_subtitle_codec (NO direct access).
|
|
*)
|
|
subtitle_codec: pAVCodec;
|
|
end;
|
|
|
|
// int av_format_get_probe_score(const AVFormatContext *s);
|
|
// AVCodec * av_format_get_video_codec(const AVFormatContext *s);
|
|
// void av_format_set_video_codec(AVFormatContext *s, AVCodec *c);
|
|
// AVCodec * av_format_get_audio_codec(const AVFormatContext *s);
|
|
// void av_format_set_audio_codec(AVFormatContext *s, AVCodec *c);
|
|
// AVCodec * av_format_get_subtitle_codec(const AVFormatContext *s);
|
|
// void av_format_set_subtitle_codec(AVFormatContext *s, AVCodec *c);
|
|
//
|
|
(*
|
|
// * Returns the method used to set ctx->duration.
|
|
// *
|
|
// * @return AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.
|
|
*)
|
|
// enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx);
|
|
|
|
TAVPacketList = { packed } record
|
|
pkt: TAVPacket;
|
|
next: pAVPacketList;
|
|
end;
|
|
|
|
(*
|
|
// * Return the LIBAVFORMAT_VERSION_INT constant.
|
|
*)
|
|
// unsigned avformat_version(void);
|
|
//
|
|
(*
|
|
// * Return the libavformat build-time configuration.
|
|
*)
|
|
// const char *avformat_configuration(void);
|
|
//
|
|
(*
|
|
// * Return the libavformat license.
|
|
*)
|
|
// const char *avformat_license(void);
|
|
//
|
|
(*
|
|
// * Initialize libavformat and register all the muxers, demuxers and
|
|
// * protocols. If you do not call this function, then you can select
|
|
// * exactly which formats you want to support.
|
|
// *
|
|
// * @see av_register_input_format()
|
|
// * @see av_register_output_format()
|
|
*)
|
|
// void av_register_all(void);
|
|
procedure av_register_all(); cdecl;
|
|
//
|
|
// void av_register_input_format(AVInputFormat *format);
|
|
// void av_register_output_format(AVOutputFormat *format);
|
|
//
|
|
(*
|
|
// * Do global initialization of network components. This is optional,
|
|
// * but recommended, since it avoids the overhead of implicitly
|
|
// * doing the setup for each session.
|
|
// *
|
|
// * Calling this function will become mandatory if using network
|
|
// * protocols at some major version bump.
|
|
*)
|
|
// int avformat_network_init(void);
|
|
function avformat_network_init(): Integer; cdecl;
|
|
//
|
|
(*
|
|
// * Undo the initialization done by avformat_network_init.
|
|
*)
|
|
// int avformat_network_deinit(void);
|
|
function avformat_network_deinit(): Integer; cdecl;
|
|
//
|
|
(*
|
|
// * If f is NULL, returns the first registered input format,
|
|
// * if f is non-NULL, returns the next registered input format after f
|
|
// * or NULL if f is the last one.
|
|
*)
|
|
// AVInputFormat *av_iformat_next(AVInputFormat *f);
|
|
//
|
|
(*
|
|
// * If f is NULL, returns the first registered output format,
|
|
// * if f is non-NULL, returns the next registered output format after f
|
|
// * or NULL if f is the last one.
|
|
*)
|
|
// AVOutputFormat *av_oformat_next(AVOutputFormat *f);
|
|
//
|
|
(*
|
|
// * Allocate an AVFormatContext.
|
|
// * avformat_free_context() can be used to free the context and everything
|
|
// * allocated by the framework within it.
|
|
*)
|
|
function avformat_alloc_context(): pAVFormatContext; cdecl;
|
|
//
|
|
(*
|
|
// * Free an AVFormatContext and all its streams.
|
|
// * @param s context to free
|
|
*)
|
|
// void avformat_free_context(AVFormatContext *s);
|
|
procedure avformat_free_context(s: pAVFormatContext); cdecl;
|
|
(*
|
|
// * Get the AVClass for AVFormatContext. It can be used in combination with
|
|
// * AV_OPT_SEARCH_FAKE_OBJ for examining options.
|
|
// *
|
|
// * @see av_opt_find().
|
|
*)
|
|
// const AVClass *avformat_get_class(void);
|
|
//
|
|
(*
|
|
// * Add a new stream to a media file.
|
|
// *
|
|
// * When demuxing, it is called by the demuxer in read_header(). If the
|
|
// * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
|
|
// * be called in read_packet().
|
|
// *
|
|
// * When muxing, should be called by the user before avformat_write_header().
|
|
// *
|
|
// * User is required to call avcodec_close() and avformat_free_context() to
|
|
// * clean up the allocation by avformat_new_stream().
|
|
// *
|
|
// * @param c If non-NULL, the AVCodecContext corresponding to the new stream
|
|
// * will be initialized to use this codec. This is needed for e.g. codec-specific
|
|
// * defaults to be set, so codec should be provided if it is known.
|
|
// *
|
|
// * @return newly created stream or NULL on error.
|
|
*)
|
|
// AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c);
|
|
function avformat_new_stream(s: pAVFormatContext; const c: pAVCodec): pAVStream; cdecl;
|
|
// AVProgram *av_new_program(AVFormatContext *s, int id);
|
|
//
|
|
(*
|
|
// * @}
|
|
*)
|
|
//
|
|
//
|
|
// #if FF_API_ALLOC_OUTPUT_CONTEXT
|
|
(*
|
|
* @deprecated deprecated in favor of avformat_alloc_output_context2()
|
|
*)
|
|
// attribute_deprecated
|
|
// AVFormatContext *avformat_alloc_output_context(const char *format,
|
|
// AVOutputFormat *oformat,
|
|
// const char *filename);
|
|
// #endif
|
|
//
|
|
(*
|
|
* Allocate an AVFormatContext for an output format.
|
|
* avformat_free_context() can be used to free the context and
|
|
* everything allocated by the framework within it.
|
|
*
|
|
* @param *ctx is set to the created format context, or to NULL in
|
|
* case of failure
|
|
* @param oformat format to use for allocating the context, if NULL
|
|
* format_name and filename are used instead
|
|
* @param format_name the name of output format to use for allocating the
|
|
* context, if NULL filename is used instead
|
|
* @param filename the name of the filename to use for allocating the
|
|
* context, may be NULL
|
|
* @return >= 0 in case of success, a negative AVERROR code in case of
|
|
* failure
|
|
*)
|
|
// int avformat_alloc_output_context2(AVFormatContext **ctx, AVOutputFormat *oformat, const char *format_name, const char *filename);
|
|
function avformat_alloc_output_context2(Var ctx: pAVFormatContext; oformat: pAVOutputFormat;
|
|
const format_name: pAnsiChar; const filename: pAnsiChar): Integer; cdecl;
|
|
(*
|
|
// * @addtogroup lavf_decoding
|
|
// * @{
|
|
*)
|
|
//
|
|
(*
|
|
// * Find AVInputFormat based on the short name of the input format.
|
|
*)
|
|
// AVInputFormat *av_find_input_format(const char *short_name);
|
|
//
|
|
(*
|
|
* Guess the file format.
|
|
*
|
|
* @param is_opened Whether the file is already opened; determines whether
|
|
* demuxers with or without AVFMT_NOFILE are probed.
|
|
*)
|
|
// AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
|
|
//
|
|
(*
|
|
* Guess the file format.
|
|
*
|
|
* @param is_opened Whether the file is already opened; determines whether
|
|
* demuxers with or without AVFMT_NOFILE are probed.
|
|
* @param score_max A probe score larger that this is required to accept a
|
|
* detection, the variable is set to the actual detection
|
|
* score afterwards.
|
|
* If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
|
|
* to retry with a larger probe buffer.
|
|
*)
|
|
// AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
|
|
//
|
|
(*
|
|
* Guess the file format.
|
|
*
|
|
* @param is_opened Whether the file is already opened; determines whether
|
|
* demuxers with or without AVFMT_NOFILE are probed.
|
|
* @param score_ret The score of the best detection.
|
|
*)
|
|
// AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
|
|
//
|
|
(*
|
|
* Probe a bytestream to determine the input format. Each time a probe returns
|
|
* with a score that is too low, the probe buffer size is increased and another
|
|
* attempt is made. When the maximum probe size is reached, the input format
|
|
* with the highest score is returned.
|
|
*
|
|
* @param pb the bytestream to probe
|
|
* @param fmt the input format is put here
|
|
* @param filename the filename of the stream
|
|
* @param logctx the log context
|
|
* @param offset the offset within the bytestream to probe from
|
|
* @param max_probe_size the maximum probe buffer size (zero for default)
|
|
* @return the score in case of success, a negative value corresponding to an
|
|
* the maximal score is AVPROBE_SCORE_MAX
|
|
* AVERROR code otherwise
|
|
*)
|
|
// int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt,
|
|
// const char *filename, void *logctx,
|
|
// unsigned int offset, unsigned int max_probe_size);
|
|
//
|
|
(*
|
|
* Like av_probe_input_buffer2() but returns 0 on success
|
|
*)
|
|
// int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
|
|
// const char *filename, void *logctx,
|
|
// unsigned int offset, unsigned int max_probe_size);
|
|
//
|
|
(*
|
|
* Open an input stream and read the header. The codecs are not opened.
|
|
* The stream must be closed with avformat_close_input().
|
|
*
|
|
* @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
|
|
* May be a pointer to NULL, in which case an AVFormatContext is allocated by this
|
|
* function and written into ps.
|
|
* Note that a user-supplied AVFormatContext will be freed on failure.
|
|
* @param filename Name of the stream to open.
|
|
* @param fmt If non-NULL, this parameter forces a specific input format.
|
|
* Otherwise the format is autodetected.
|
|
* @param options A dictionary filled with AVFormatContext and demuxer-private options.
|
|
* On return this parameter will be destroyed and replaced with a dict containing
|
|
* options that were not found. May be NULL.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on failure.
|
|
*
|
|
* @note If you want to use custom IO, preallocate the format context and set its pb field.
|
|
*)
|
|
|
|
// int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
|
|
function avformat_open_input(var ps: pAVFormatContext; const filename: pAnsiChar; fmt: pAVInputFormat;
|
|
options: ppAVDictionary): Integer; cdecl;
|
|
|
|
// attribute_deprecated
|
|
// int av_demuxer_open(AVFormatContext *ic);
|
|
//
|
|
// #if FF_API_FORMAT_PARAMETERS
|
|
(*
|
|
// * Read packets of a media file to get stream information. This
|
|
// * is useful for file formats with no headers such as MPEG. This
|
|
// * function also computes the real framerate in case of MPEG-2 repeat
|
|
// * frame mode.
|
|
// * The logical file position is not changed by this function;
|
|
// * examined packets may be buffered for later processing.
|
|
// *
|
|
// * @param ic media file handle
|
|
// * @return >=0 if OK, AVERROR_xxx on error
|
|
// * @todo Let the user decide somehow what information is needed so that
|
|
// * we do not waste time getting stuff the user does not need.
|
|
// *
|
|
// * @deprecated use avformat_find_stream_info.
|
|
*)
|
|
// attribute_deprecated
|
|
// int av_find_stream_info(AVFormatContext *ic);
|
|
// #endif
|
|
//
|
|
(*
|
|
* Read packets of a media file to get stream information. This
|
|
* is useful for file formats with no headers such as MPEG. This
|
|
* function also computes the real framerate in case of MPEG-2 repeat
|
|
* frame mode.
|
|
* The logical file position is not changed by this function;
|
|
* examined packets may be buffered for later processing.
|
|
*
|
|
* @param ic media file handle
|
|
* @param options If non-NULL, an ic.nb_streams long array of pointers to
|
|
* dictionaries, where i-th member contains options for
|
|
* codec corresponding to i-th stream.
|
|
* On return each dictionary will be filled with options that were not found.
|
|
* @return >=0 if OK, AVERROR_xxx on error
|
|
*
|
|
* @note this function isn't guaranteed to open all the codecs, so
|
|
* options being non-empty at return is a perfectly normal behavior.
|
|
*
|
|
* @todo Let the user decide somehow what information is needed so that
|
|
* we do not waste time getting stuff the user does not need.
|
|
*)
|
|
// int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
|
|
function avformat_find_stream_info(ic: pAVFormatContext; options: ppAVDictionary): Integer; cdecl;
|
|
(*
|
|
// * Find the programs which belong to a given stream.
|
|
// *
|
|
// * @param ic media file handle
|
|
// * @param last the last found program, the search will start after this
|
|
// * program, or from the beginning if it is NULL
|
|
// * @param s stream index
|
|
// * @return the next program which belongs to s, NULL if no program is found or
|
|
// * the last program is not among the programs of ic.
|
|
*)
|
|
// AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s);
|
|
//
|
|
(*
|
|
// * Find the "best" stream in the file.
|
|
// * The best stream is determined according to various heuristics as the most
|
|
// * likely to be what the user expects.
|
|
// * If the decoder parameter is non-NULL, av_find_best_stream will find the
|
|
// * default decoder for the stream's codec; streams for which no decoder can
|
|
// * be found are ignored.
|
|
// *
|
|
// * @param ic media file handle
|
|
// * @param type stream type: video, audio, subtitles, etc.
|
|
// * @param wanted_stream_nb user-requested stream number,
|
|
// * or -1 for automatic selection
|
|
// * @param related_stream try to find a stream related (eg. in the same
|
|
// * program) to this one, or -1 if none
|
|
// * @param decoder_ret if non-NULL, returns the decoder for the
|
|
// * selected stream
|
|
// * @param flags flags; none are currently defined
|
|
// * @return the non-negative stream number in case of success,
|
|
// * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
|
|
// * could be found,
|
|
// * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
|
|
// * @note If av_find_best_stream returns successfully and decoder_ret is not
|
|
// * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
|
|
*)
|
|
// int av_find_best_stream(AVFormatContext *ic,
|
|
// enum AVMediaType type,
|
|
// int wanted_stream_nb,
|
|
// int related_stream,
|
|
// AVCodec **decoder_ret,
|
|
// int flags);
|
|
function av_find_best_stream(ic: pAVFormatContext; _type: TAVMediaType; wanted_stream_nb: Integer;
|
|
related_stream: Integer; Var decoder_ret: pAVCodec; flags: Integer): Integer; cdecl;
|
|
|
|
// #if FF_API_READ_PACKET
|
|
(*
|
|
// * @deprecated use AVFMT_FLAG_NOFILLIN | AVFMT_FLAG_NOPARSE to read raw
|
|
// * unprocessed packets
|
|
// *
|
|
// * Read a transport packet from a media file.
|
|
// *
|
|
// * This function is obsolete and should never be used.
|
|
// * Use av_read_frame() instead.
|
|
// *
|
|
// * @param s media file handle
|
|
// * @param pkt is filled
|
|
// * @return 0 if OK, AVERROR_xxx on error
|
|
*)
|
|
// attribute_deprecated
|
|
// int av_read_packet(AVFormatContext *s, AVPacket *pkt);
|
|
// #endif
|
|
//
|
|
(*
|
|
// * Return the next frame of a stream.
|
|
// * This function returns what is stored in the file, and does not validate
|
|
// * that what is there are valid frames for the decoder. It will split what is
|
|
// * stored in the file into frames and return one for each call. It will not
|
|
// * omit invalid data between valid frames so as to give the decoder the maximum
|
|
// * information possible for decoding.
|
|
// *
|
|
// * If pkt->buf is NULL, then the packet is valid until the next
|
|
// * av_read_frame() or until avformat_close_input(). Otherwise the packet
|
|
// * is valid indefinitely. In both cases the packet must be freed with
|
|
// * av_free_packet when it is no longer needed. For video, the packet contains
|
|
// * exactly one frame. For audio, it contains an integer number of frames if each
|
|
// * frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames
|
|
// * have a variable size (e.g. MPEG audio), then it contains one frame.
|
|
// *
|
|
// * pkt->pts, pkt->dts and pkt->duration are always set to correct
|
|
// * values in AVStream.time_base units (and guessed if the format cannot
|
|
// * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
|
|
// * has B-frames, so it is better to rely on pkt->dts if you do not
|
|
// * decompress the payload.
|
|
// *
|
|
// * @return 0 if OK, < 0 on error or end of file
|
|
*)
|
|
// int av_read_frame(AVFormatContext *s, AVPacket *pkt);
|
|
function av_read_frame(s: pAVFormatContext; Var pkt: TAVPacket): Integer; cdecl;
|
|
//
|
|
(*
|
|
// * Seek to the keyframe at timestamp.
|
|
// * 'timestamp' in 'stream_index'.
|
|
// * @param stream_index If stream_index is (-1), a default
|
|
// * stream is selected, and timestamp is automatically converted
|
|
// * from AV_TIME_BASE units to the stream specific time_base.
|
|
// * @param timestamp Timestamp in AVStream.time_base units
|
|
// * or, if no stream is specified, in AV_TIME_BASE units.
|
|
// * @param flags flags which select direction and seeking mode
|
|
// * @return >= 0 on success
|
|
*)
|
|
// int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
|
|
// int flags);
|
|
//
|
|
(*
|
|
// * Seek to timestamp ts.
|
|
// * Seeking will be done so that the point from which all active streams
|
|
// * can be presented successfully will be closest to ts and within min/max_ts.
|
|
// * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
|
|
// *
|
|
// * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
|
|
// * are the file position (this may not be supported by all demuxers).
|
|
// * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
|
|
// * in the stream with stream_index (this may not be supported by all demuxers).
|
|
// * Otherwise all timestamps are in units of the stream selected by stream_index
|
|
// * or if stream_index is -1, in AV_TIME_BASE units.
|
|
// * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
|
|
// * keyframes (this may not be supported by all demuxers).
|
|
// * If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.
|
|
// *
|
|
// * @param stream_index index of the stream which is used as time base reference
|
|
// * @param min_ts smallest acceptable timestamp
|
|
// * @param ts target timestamp
|
|
// * @param max_ts largest acceptable timestamp
|
|
// * @param flags flags
|
|
// * @return >=0 on success, error code otherwise
|
|
// *
|
|
// * @note This is part of the new seek API which is still under construction.
|
|
// * Thus do not use this yet. It may change at any time, do not expect
|
|
// * ABI compatibility yet!
|
|
*)
|
|
// int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
|
|
//
|
|
(*
|
|
// * Start playing a network-based stream (e.g. RTSP stream) at the
|
|
// * current position.
|
|
*)
|
|
// int av_read_play(AVFormatContext *s);
|
|
//
|
|
(*
|
|
// * Pause a network-based stream (e.g. RTSP stream).
|
|
// *
|
|
// * Use av_read_play() to resume it.
|
|
*)
|
|
// int av_read_pause(AVFormatContext *s);
|
|
//
|
|
// #if FF_API_CLOSE_INPUT_FILE
|
|
(*
|
|
// * @deprecated use avformat_close_input()
|
|
// * Close a media file (but not its codecs).
|
|
// *
|
|
// * @param s media file handle
|
|
*)
|
|
// attribute_deprecated
|
|
// void av_close_input_file(AVFormatContext *s);
|
|
// #endif
|
|
//
|
|
(*
|
|
// * Close an opened input AVFormatContext. Free it and all its contents
|
|
// * and set *s to NULL.
|
|
*)
|
|
// void avformat_close_input(AVFormatContext **s);
|
|
procedure avformat_close_input(Var s: pAVFormatContext); cdecl;
|
|
(*
|
|
// * @}
|
|
*)
|
|
//
|
|
// #if FF_API_NEW_STREAM
|
|
(*
|
|
// * Add a new stream to a media file.
|
|
// *
|
|
// * Can only be called in the read_header() function. If the flag
|
|
// * AVFMTCTX_NOHEADER is in the format context, then new streams
|
|
// * can be added in read_packet too.
|
|
// *
|
|
// * @param s media file handle
|
|
// * @param id file-format-dependent stream ID
|
|
*)
|
|
// attribute_deprecated
|
|
// AVStream *av_new_stream(AVFormatContext *s, int id);
|
|
// #endif
|
|
//
|
|
// #if FF_API_SET_PTS_INFO
|
|
(*
|
|
// * @deprecated this function is not supposed to be called outside of lavf
|
|
*)
|
|
// attribute_deprecated
|
|
// void av_set_pts_info(AVStream *s, int pts_wrap_bits,
|
|
// unsigned int pts_num, unsigned int pts_den);
|
|
// #endif
|
|
//
|
|
// #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
|
|
// #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
|
|
// #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
|
|
// #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
|
|
//
|
|
(*
|
|
// * @addtogroup lavf_encoding
|
|
// * @{
|
|
*)
|
|
(*
|
|
// * Allocate the stream private data and write the stream header to
|
|
// * an output media file.
|
|
// *
|
|
// * @param s Media file handle, must be allocated with avformat_alloc_context().
|
|
// * Its oformat field must be set to the desired output format;
|
|
// * Its pb field must be set to an already opened AVIOContext.
|
|
// * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
|
|
// * On return this parameter will be destroyed and replaced with a dict containing
|
|
// * options that were not found. May be NULL.
|
|
// *
|
|
// * @return 0 on success, negative AVERROR on failure.
|
|
// *
|
|
// * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
|
|
*)
|
|
// int avformat_write_header(AVFormatContext *s, AVDictionary **options);
|
|
function avformat_write_header(s: pAVFormatContext; options: ppAVDictionary): Integer; cdecl;
|
|
(*
|
|
// * Write a packet to an output media file.
|
|
// *
|
|
// * The packet shall contain one audio or video frame.
|
|
// * The packet must be correctly interleaved according to the container
|
|
// * specification, if not then av_interleaved_write_frame must be used.
|
|
// *
|
|
// * @param s media file handle
|
|
// * @param pkt The packet, which contains the stream_index, buf/buf_size,
|
|
// * dts/pts, ...
|
|
// * This can be NULL (at any time, not just at the end), in
|
|
// * order to immediately flush data buffered within the muxer,
|
|
// * for muxers that buffer up data internally before writing it
|
|
// * to the output.
|
|
// * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
|
|
*)
|
|
// int av_write_frame(AVFormatContext *s, AVPacket *pkt);
|
|
function av_write_frame(s: pAVFormatContext; pkt: pAVPacket): Integer; cdecl;
|
|
(*
|
|
// * Write a packet to an output media file ensuring correct interleaving.
|
|
// *
|
|
// * The packet must contain one audio or video frame.
|
|
// * If the packets are already correctly interleaved, the application should
|
|
// * call av_write_frame() instead as it is slightly faster. It is also important
|
|
// * to keep in mind that completely non-interleaved input will need huge amounts
|
|
// * of memory to interleave with this, so it is preferable to interleave at the
|
|
// * demuxer level.
|
|
// *
|
|
// * @param s media file handle
|
|
// * @param pkt The packet containing the data to be written. pkt->buf must be set
|
|
// * to a valid AVBufferRef describing the packet data. Libavformat takes
|
|
// * ownership of this reference and will unref it when it sees fit. The caller
|
|
// * must not access the data through this reference after this function returns.
|
|
// * This can be NULL (at any time, not just at the end), to flush the
|
|
// * interleaving queues.
|
|
// * Packet's @ref AVPacket.stream_index "stream_index" field must be set to the
|
|
// * index of the corresponding stream in @ref AVFormatContext.streams
|
|
// * "s.streams".
|
|
// * It is very strongly recommended that timing information (@ref AVPacket.pts
|
|
// * "pts", @ref AVPacket.dts "dts" @ref AVPacket.duration "duration") is set to
|
|
// * correct values.
|
|
// *
|
|
// * @return 0 on success, a negative AVERROR on error.
|
|
*)
|
|
// int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
|
|
function av_interleaved_write_frame(s: pAVFormatContext; pkt: pAVPacket): Integer; cdecl;
|
|
|
|
(*
|
|
// * Write the stream trailer to an output media file and free the
|
|
// * file private data.
|
|
// *
|
|
// * May only be called after a successful call to avformat_write_header.
|
|
// *
|
|
// * @param s media file handle
|
|
// * @return 0 if OK, AVERROR_xxx on error
|
|
*)
|
|
// int av_write_trailer(AVFormatContext *s);
|
|
function av_write_trailer(s: pAVFormatContext): Integer; cdecl;
|
|
//
|
|
(*
|
|
// * Return the output format in the list of registered output formats
|
|
// * which best matches the provided parameters, or return NULL if
|
|
// * there is no match.
|
|
// *
|
|
// * @param short_name if non-NULL checks if short_name matches with the
|
|
// * names of the registered formats
|
|
// * @param filename if non-NULL checks if filename terminates with the
|
|
// * extensions of the registered formats
|
|
// * @param mime_type if non-NULL checks if mime_type matches with the
|
|
// * MIME type of the registered formats
|
|
*)
|
|
// AVOutputFormat *av_guess_format(const char *short_name,
|
|
// const char *filename,
|
|
// const char *mime_type);
|
|
|
|
function av_guess_format(const short_name: pAnsiChar; const filename: pAnsiChar; const mime_type: pAnsiChar)
|
|
: pAVOutputFormat; cdecl;
|
|
|
|
(*
|
|
// * Guess the codec ID based upon muxer and filename.
|
|
*)
|
|
// enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
|
|
// const char *filename, const char *mime_type,
|
|
// enum AVMediaType type);
|
|
//
|
|
(*
|
|
// * Get timing information for the data currently output.
|
|
// * The exact meaning of "currently output" depends on the format.
|
|
// * It is mostly relevant for devices that have an internal buffer and/or
|
|
// * work in real time.
|
|
// * @param s media file handle
|
|
// * @param stream stream in the media file
|
|
// * @param[out] dts DTS of the last packet output for the stream, in stream
|
|
// * time_base units
|
|
// * @param[out] wall absolute time when that packet whas output,
|
|
// * in microsecond
|
|
// * @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
|
|
// * Note: some formats or devices may not allow to measure dts and wall
|
|
// * atomically.
|
|
*)
|
|
// int av_get_output_timestamp(struct AVFormatContext *s, int stream,
|
|
// int64_t *dts, int64_t *wall);
|
|
//
|
|
//
|
|
(*
|
|
// * @}
|
|
*)
|
|
//
|
|
//
|
|
(*
|
|
// * @defgroup lavf_misc Utility functions
|
|
// * @ingroup libavf
|
|
// * @{
|
|
// *
|
|
// * Miscellaneous utility functions related to both muxing and demuxing
|
|
// * (or neither).
|
|
*)
|
|
//
|
|
(*
|
|
// * Send a nice hexadecimal dump of a buffer to the specified file stream.
|
|
// *
|
|
// * @param f The file stream pointer where the dump should be sent to.
|
|
// * @param buf buffer
|
|
// * @param size buffer size
|
|
// *
|
|
// * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
|
|
*)
|
|
// void av_hex_dump(FILE *f, const uint8_t *buf, int size);
|
|
//
|
|
(*
|
|
// * Send a nice hexadecimal dump of a buffer to the log.
|
|
// *
|
|
// * @param avcl A pointer to an arbitrary struct of which the first field is a
|
|
// * pointer to an AVClass struct.
|
|
// * @param level The importance level of the message, lower values signifying
|
|
// * higher importance.
|
|
// * @param buf buffer
|
|
// * @param size buffer size
|
|
// *
|
|
// * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
|
|
*)
|
|
// void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
|
|
//
|
|
(*
|
|
// * Send a nice dump of a packet to the specified file stream.
|
|
// *
|
|
// * @param f The file stream pointer where the dump should be sent to.
|
|
// * @param pkt packet to dump
|
|
// * @param dump_payload True if the payload must be displayed, too.
|
|
// * @param st AVStream that the packet belongs to
|
|
*)
|
|
// void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
|
|
//
|
|
//
|
|
(*
|
|
// * Send a nice dump of a packet to the log.
|
|
// *
|
|
// * @param avcl A pointer to an arbitrary struct of which the first field is a
|
|
// * pointer to an AVClass struct.
|
|
// * @param level The importance level of the message, lower values signifying
|
|
// * higher importance.
|
|
// * @param pkt packet to dump
|
|
// * @param dump_payload True if the payload must be displayed, too.
|
|
// * @param st AVStream that the packet belongs to
|
|
*)
|
|
// void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
|
|
// AVStream *st);
|
|
//
|
|
(*
|
|
// * Get the AVCodecID for the given codec tag tag.
|
|
// * If no codec id is found returns AV_CODEC_ID_NONE.
|
|
// *
|
|
// * @param tags list of supported codec_id-codec_tag pairs, as stored
|
|
// * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
*)
|
|
// enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
|
|
//
|
|
(*
|
|
// * Get the codec tag for the given codec id id.
|
|
// * If no codec tag is found returns 0.
|
|
// *
|
|
// * @param tags list of supported codec_id-codec_tag pairs, as stored
|
|
// * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
*)
|
|
// unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
|
|
//
|
|
(*
|
|
// * Get the codec tag for the given codec id.
|
|
// *
|
|
// * @param tags list of supported codec_id - codec_tag pairs, as stored
|
|
// * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
// * @param id codec id that should be searched for in the list
|
|
// * @param tag A pointer to the found tag
|
|
// * @return 0 if id was not found in tags, > 0 if it was found
|
|
*)
|
|
// int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
|
|
// unsigned int *tag);
|
|
//
|
|
// int av_find_default_stream_index(AVFormatContext *s);
|
|
//
|
|
(*
|
|
// * Get the index for a specific timestamp.
|
|
// * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
|
|
// * to the timestamp which is <= the requested one, if backward
|
|
// * is 0, then it will be >=
|
|
// * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
|
|
// * @return < 0 if no such timestamp could be found
|
|
*)
|
|
// int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
|
|
//
|
|
(*
|
|
// * Add an index entry into a sorted list. Update the entry if the list
|
|
// * already contains it.
|
|
// *
|
|
// * @param timestamp timestamp in the time base of the given stream
|
|
*)
|
|
// int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
|
|
// int size, int distance, int flags);
|
|
//
|
|
//
|
|
(*
|
|
// * Split a URL string into components.
|
|
// *
|
|
// * The pointers to buffers for storing individual components may be null,
|
|
// * in order to ignore that component. Buffers for components not found are
|
|
// * set to empty strings. If the port is not found, it is set to a negative
|
|
// * value.
|
|
// *
|
|
// * @param proto the buffer for the protocol
|
|
// * @param proto_size the size of the proto buffer
|
|
// * @param authorization the buffer for the authorization
|
|
// * @param authorization_size the size of the authorization buffer
|
|
// * @param hostname the buffer for the host name
|
|
// * @param hostname_size the size of the hostname buffer
|
|
// * @param port_ptr a pointer to store the port number in
|
|
// * @param path the buffer for the path
|
|
// * @param path_size the size of the path buffer
|
|
// * @param url the URL to split
|
|
*)
|
|
// void av_url_split(char *proto, int proto_size,
|
|
// char *authorization, int authorization_size,
|
|
// char *hostname, int hostname_size,
|
|
// int *port_ptr,
|
|
// char *path, int path_size,
|
|
// const char *url);
|
|
//
|
|
//
|
|
// void av_dump_format(AVFormatContext *ic, int index, const char *url, int is_output);
|
|
procedure av_dump_format(ic: pAVFormatContext; index: Integer; url: pAnsiChar; is_output: Integer); cdecl;
|
|
|
|
(*
|
|
// * Return in 'buf' the path with '%d' replaced by a number.
|
|
// *
|
|
// * Also handles the '%0nd' format where 'n' is the total number
|
|
// * of digits and '%%'.
|
|
// *
|
|
// * @param buf destination buffer
|
|
// * @param buf_size destination buffer size
|
|
// * @param path numbered sequence string
|
|
// * @param number frame number
|
|
// * @return 0 if OK, -1 on format error
|
|
*)
|
|
// int av_get_frame_filename(char *buf, int buf_size,
|
|
// const char *path, int number);
|
|
//
|
|
(*
|
|
// * Check whether filename actually is a numbered sequence generator.
|
|
// *
|
|
// * @param filename possible numbered sequence string
|
|
// * @return 1 if a valid numbered sequence string, 0 otherwise
|
|
*)
|
|
// int av_filename_number_test(const char *filename);
|
|
//
|
|
(*
|
|
// * Generate an SDP for an RTP session.
|
|
// *
|
|
// * Note, this overwrites the id values of AVStreams in the muxer contexts
|
|
// * for getting unique dynamic payload types.
|
|
// *
|
|
// * @param ac array of AVFormatContexts describing the RTP streams. If the
|
|
// * array is composed by only one context, such context can contain
|
|
// * multiple AVStreams (one AVStream per RTP stream). Otherwise,
|
|
// * all the contexts in the array (an AVCodecContext per RTP stream)
|
|
// * must contain only one AVStream.
|
|
// * @param n_files number of AVCodecContexts contained in ac
|
|
// * @param buf buffer where the SDP will be stored (must be allocated by
|
|
// * the caller)
|
|
// * @param size the size of the buffer
|
|
// * @return 0 if OK, AVERROR_xxx on error
|
|
*)
|
|
// int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
|
|
//
|
|
(*
|
|
// * Return a positive value if the given filename has one of the given
|
|
// * extensions, 0 otherwise.
|
|
// *
|
|
// * @param extensions a comma-separated list of filename extensions
|
|
*)
|
|
// int av_match_ext(const char *filename, const char *extensions);
|
|
//
|
|
(*
|
|
// * Test if the given container can store a codec.
|
|
// *
|
|
// * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
|
|
// *
|
|
// * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
|
|
// * A negative number if this information is not available.
|
|
*)
|
|
// int avformat_query_codec(AVOutputFormat *ofmt, enum AVCodecID codec_id, int std_compliance);
|
|
//
|
|
(*
|
|
// * @defgroup riff_fourcc RIFF FourCCs
|
|
// * @{
|
|
// * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
|
|
// * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
|
|
// * following code:
|
|
// * @code
|
|
// * uint32_t tag = MKTAG('H', '2', '6', '4');
|
|
// * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
|
|
// * enum AVCodecID id = av_codec_get_id(table, tag);
|
|
// * @endcode
|
|
*)
|
|
(*
|
|
// * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
|
|
*)
|
|
// const struct AVCodecTag *avformat_get_riff_video_tags(void);
|
|
(*
|
|
// * @return the table mapping RIFF FourCCs for audio to AVCodecID.
|
|
*)
|
|
// const struct AVCodecTag *avformat_get_riff_audio_tags(void);
|
|
//
|
|
(*
|
|
// * @}
|
|
*)
|
|
//
|
|
(*
|
|
// * Guess the sample aspect ratio of a frame, based on both the stream and the
|
|
// * frame aspect ratio.
|
|
// *
|
|
// * Since the frame aspect ratio is set by the codec but the stream aspect ratio
|
|
// * is set by the demuxer, these two may not be equal. This function tries to
|
|
// * return the value that you should use if you would like to display the frame.
|
|
// *
|
|
// * Basic logic is to use the stream aspect ratio if it is set to something sane
|
|
// * otherwise use the frame aspect ratio. This way a container setting, which is
|
|
// * usually easy to modify can override the coded value in the frames.
|
|
// *
|
|
// * @param format the format context which the stream is part of
|
|
// * @param stream the stream which the frame is part of
|
|
// * @param frame the frame with the aspect ratio to be determined
|
|
// * @return the guessed (valid) sample_aspect_ratio, 0/1 if no idea
|
|
*)
|
|
// AVRational av_guess_sample_aspect_ratio(AVFormatContext *format, AVStream *stream, AVFrame *frame);
|
|
//
|
|
(*
|
|
// * Guess the frame rate, based on both the container and codec information.
|
|
// *
|
|
// * @param ctx the format context which the stream is part of
|
|
// * @param stream the stream which the frame is part of
|
|
// * @param frame the frame for which the frame rate should be determined, may be NULL
|
|
// * @return the guessed (valid) frame rate, 0/1 if no idea
|
|
*)
|
|
// AVRational av_guess_frame_rate(AVFormatContext *ctx, AVStream *stream, AVFrame *frame);
|
|
//
|
|
(*
|
|
// * Check if the stream st contained in s is matched by the stream specifier
|
|
// * spec.
|
|
// *
|
|
// * See the "stream specifiers" chapter in the documentation for the syntax
|
|
// * of spec.
|
|
// *
|
|
// * @return >0 if st is matched by spec;
|
|
// * 0 if st is not matched by spec;
|
|
// * AVERROR code if spec is invalid
|
|
// *
|
|
// * @note A stream specifier can match several streams in the format.
|
|
*)
|
|
// int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
|
|
// const char *spec);
|
|
//
|
|
// int avformat_queue_attached_pictures(AVFormatContext *s);
|
|
//
|
|
(*
|
|
// * @}
|
|
*)
|
|
|
|
implementation
|
|
|
|
uses ffm.lib;
|
|
|
|
procedure av_register_all; external avformat_dll;
|
|
function avformat_open_input; external avformat_dll;
|
|
function avformat_alloc_context; external avformat_dll;
|
|
procedure avformat_free_context; external avformat_dll;
|
|
function avformat_find_stream_info; external avformat_dll;
|
|
procedure av_dump_format; external avformat_dll;
|
|
function avformat_alloc_output_context2; external avformat_dll;
|
|
function av_find_best_stream; external avformat_dll;
|
|
procedure avformat_close_input; external avformat_dll;
|
|
function av_read_frame; external avformat_dll;
|
|
function avformat_network_init; external avformat_dll;
|
|
function avformat_network_deinit; external avformat_dll;
|
|
function av_guess_format; external avformat_dll;
|
|
function avformat_write_header; external avformat_dll;
|
|
function av_write_trailer; external avformat_dll;
|
|
function avformat_new_stream; external avformat_dll;
|
|
function av_interleaved_write_frame; external avformat_dll;
|
|
function av_write_frame; external avformat_dll;
|
|
|
|
end.
|