(*
  *
  * This file is part of ffm.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*)

unit ffm.buffersrc;

{$i ffmpeg.inc}

interface

uses
  ffm.frame, ffm.avfilter;

const
  (*
    * Do not check for format changes.
  *)
  AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT = 1;

{$IFDEF FF_API_AVFILTERBUFFER}
  (*
    * Ignored
  *)
  AV_BUFFERSRC_FLAG_NO_COPY = 2;
{$ENDIF}
  (*
    * Immediately push the frame to the output.
  *)
  AV_BUFFERSRC_FLAG_PUSH = 4;

  (*
    * Keep a reference to the frame.
    * If the frame if reference-counted, create a new reference; otherwise
    * copy the frame data.
  *)
  AV_BUFFERSRC_FLAG_KEEP_REF = 8;

  (*
    * Add buffer data in picref to buffer_src.
    *
    * @param buffer_src  pointer to a buffer source context
    * @param picref      a buffer reference, or NULL to mark EOF
    * @param flags       a combination of AV_BUFFERSRC_FLAG_*
    * @return            >= 0 in case of success, a negative AVERROR code
    *                    in case of failure
  *)
  // int av_buffersrc_add_ref(AVFilterContext *buffer_src,
  // AVFilterBufferRef *picref, int flags);

  (*
    * Get the number of failed requests.
    *
    * A failed request is when the request_frame method is called while no
    * frame is present in the buffer.
    * The number is reset when a frame is added.
  *)
  // unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src);

  // #if FF_API_AVFILTERBUFFER
  (*
    * Add a buffer to the filtergraph s.
    *
    * @param buf buffer containing frame data to be passed down the filtergraph.
    * This function will take ownership of buf, the user must not free it.
    * A NULL buf signals EOF -- i.e. no more frames will be sent to this filter.
    *
    * @deprecated use av_buffersrc_write_frame() or av_buffersrc_add_frame()
  *)
  // attribute_deprecated
  // int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf);
  // #endif

  (*
    * Add a frame to the buffer source.
    *
    * @param s an instance of the buffersrc filter.
    * @param frame frame to be added. If the frame is reference counted, this
    * function will make a new reference to it. Otherwise the frame data will be
    * copied.
    *
    * @return 0 on success, a negative AVERROR on error
    *
    * This function is equivalent to av_buffersrc_add_frame_flags() with the
    * AV_BUFFERSRC_FLAG_KEEP_REF flag.
  *)
  // int av_buffersrc_write_frame(AVFilterContext *s, const AVFrame *frame);

  (*
    * Add a frame to the buffer source.
    *
    * @param s an instance of the buffersrc filter.
    * @param frame frame to be added. If the frame is reference counted, this
    * function will take ownership of the reference(s) and reset the frame.
    * Otherwise the frame data will be copied. If this function returns an error,
    * the input frame is not touched.
    *
    * @return 0 on success, a negative AVERROR on error.
    *
    * @note the difference between this function and av_buffersrc_write_frame() is
    * that av_buffersrc_write_frame() creates a new reference to the input frame,
    * while this function takes ownership of the reference passed to it.
    *
    * This function is equivalent to av_buffersrc_add_frame_flags() without the
    * AV_BUFFERSRC_FLAG_KEEP_REF flag.
  *)
  // int av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame);

  (*
    * Add a frame to the buffer source.
    *
    * By default, if the frame is reference-counted, this function will take
    * ownership of the reference(s) and reset the frame. This can be controled
    * using the flags.
    *
    * If this function returns an error, the input frame is not touched.
    *
    * @param buffer_src  pointer to a buffer source context
    * @param frame       a frame, or NULL to mark EOF
    * @param flags       a combination of AV_BUFFERSRC_FLAG_*
    * @return            >= 0 in case of success, a negative AVERROR code
    *                    in case of failure
  *)
  // int av_buffersrc_add_frame_flags(AVFilterContext *buffer_src,
  // AVFrame *frame, int flags);
function av_buffersrc_add_frame_flags(buffer_src: pAVFilterContext; frame: pAVFrame; flags: Integer): Integer; cdecl;

implementation

uses ffm.lib;

function av_buffersrc_add_frame_flags; external avfilter_dll;

end.