(* * Copyright (c) 2006 Michael Niedermayer * Copyright (c) 2008 Peter Ross * * This file is part of FFmpeg. * * 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.channel_layout; {$i ffmpeg.inc} interface Uses ffm.ctypes; (* * * @file * audio channel layout utility functions *) (* * * @addtogroup lavu_audio * @{ *) (* * * @defgroup channel_masks Audio channel masks * * A channel layout is a 64-bits integer with a bit set for every channel. * The number of bits set must be equal to the number of channels. * The value 0 means that the channel layout is not known. * @note this data structure is not powerful enough to handle channels * combinations that have the same channel multiple times, such as * dual-mono. * * @{ *) Const AV_CH_FRONT_LEFT = $00000001; AV_CH_FRONT_RIGHT = $00000002; AV_CH_FRONT_CENTER = $00000004; AV_CH_LOW_FREQUENCY = $00000008; AV_CH_BACK_LEFT = $00000010; AV_CH_BACK_RIGHT = $00000020; AV_CH_FRONT_LEFT_OF_CENTER = $00000040; AV_CH_FRONT_RIGHT_OF_CENTER = $00000080; AV_CH_BACK_CENTER = $00000100; AV_CH_SIDE_LEFT = $00000200; AV_CH_SIDE_RIGHT = $00000400; AV_CH_TOP_CENTER = $00000800; AV_CH_TOP_FRONT_LEFT = $00001000; AV_CH_TOP_FRONT_CENTER = $00002000; AV_CH_TOP_FRONT_RIGHT = $00004000; AV_CH_TOP_BACK_LEFT = $00008000; AV_CH_TOP_BACK_CENTER = $00010000; AV_CH_TOP_BACK_RIGHT = $00020000; AV_CH_STEREO_LEFT = $20000000; /// < Stereo downmix. AV_CH_STEREO_RIGHT = $40000000; /// < See AV_CH_STEREO_LEFT. AV_CH_WIDE_LEFT = $0000000080000000; AV_CH_WIDE_RIGHT = $0000000100000000; AV_CH_SURROUND_DIRECT_LEFT = $0000000200000000; AV_CH_SURROUND_DIRECT_RIGHT = $0000000400000000; AV_CH_LOW_FREQUENCY_2 = $0000000800000000; (* * Channel mask value used for AVCodecContext.request_channel_layout to indicate that the user requests the channel order of the decoder output to be the native codec channel order. *) AV_CH_LAYOUT_NATIVE = $8000000000000000; (* * * @} * @defgroup channel_mask_c Audio channel convenience macros * @{ * *) AV_CH_LAYOUT_MONO = (AV_CH_FRONT_CENTER); AV_CH_LAYOUT_STEREO = (AV_CH_FRONT_LEFT or AV_CH_FRONT_RIGHT); AV_CH_LAYOUT_2POINT1 = (AV_CH_LAYOUT_STEREO or AV_CH_LOW_FREQUENCY); AV_CH_LAYOUT_2_1 = (AV_CH_LAYOUT_STEREO or AV_CH_BACK_CENTER); AV_CH_LAYOUT_SURROUND = (AV_CH_LAYOUT_STEREO or AV_CH_FRONT_CENTER); AV_CH_LAYOUT_3POINT1 = (AV_CH_LAYOUT_SURROUND or AV_CH_LOW_FREQUENCY); AV_CH_LAYOUT_4POINT0 = (AV_CH_LAYOUT_SURROUND or AV_CH_BACK_CENTER); AV_CH_LAYOUT_4POINT1 = (AV_CH_LAYOUT_4POINT0 or AV_CH_LOW_FREQUENCY); AV_CH_LAYOUT_2_2 = (AV_CH_LAYOUT_STEREO or AV_CH_SIDE_LEFT or AV_CH_SIDE_RIGHT); AV_CH_LAYOUT_QUAD = (AV_CH_LAYOUT_STEREO or AV_CH_BACK_LEFT or AV_CH_BACK_RIGHT); AV_CH_LAYOUT_5POINT0 = (AV_CH_LAYOUT_SURROUND or AV_CH_SIDE_LEFT or AV_CH_SIDE_RIGHT); AV_CH_LAYOUT_5POINT1 = (AV_CH_LAYOUT_5POINT0 or AV_CH_LOW_FREQUENCY); AV_CH_LAYOUT_5POINT0_BACK = (AV_CH_LAYOUT_SURROUND or AV_CH_BACK_LEFT or AV_CH_BACK_RIGHT); AV_CH_LAYOUT_5POINT1_BACK = (AV_CH_LAYOUT_5POINT0_BACK or AV_CH_LOW_FREQUENCY); AV_CH_LAYOUT_6POINT0 = (AV_CH_LAYOUT_5POINT0 or AV_CH_BACK_CENTER); AV_CH_LAYOUT_6POINT0_FRONT = (AV_CH_LAYOUT_2_2 or AV_CH_FRONT_LEFT_OF_CENTER or AV_CH_FRONT_RIGHT_OF_CENTER); AV_CH_LAYOUT_HEXAGONAL = (AV_CH_LAYOUT_5POINT0_BACK or AV_CH_BACK_CENTER); AV_CH_LAYOUT_6POINT1 = (AV_CH_LAYOUT_5POINT1 or AV_CH_BACK_CENTER); AV_CH_LAYOUT_6POINT1_BACK = (AV_CH_LAYOUT_5POINT1_BACK or AV_CH_BACK_CENTER); AV_CH_LAYOUT_6POINT1_FRONT = (AV_CH_LAYOUT_6POINT0_FRONT or AV_CH_LOW_FREQUENCY); AV_CH_LAYOUT_7POINT0 = (AV_CH_LAYOUT_5POINT0 or AV_CH_BACK_LEFT or AV_CH_BACK_RIGHT); AV_CH_LAYOUT_7POINT0_FRONT = (AV_CH_LAYOUT_5POINT0 or AV_CH_FRONT_LEFT_OF_CENTER or AV_CH_FRONT_RIGHT_OF_CENTER); AV_CH_LAYOUT_7POINT1 = (AV_CH_LAYOUT_5POINT1 or AV_CH_BACK_LEFT or AV_CH_BACK_RIGHT); AV_CH_LAYOUT_7POINT1_WIDE = (AV_CH_LAYOUT_5POINT1 or AV_CH_FRONT_LEFT_OF_CENTER or AV_CH_FRONT_RIGHT_OF_CENTER); AV_CH_LAYOUT_7POINT1_WIDE_BACK = (AV_CH_LAYOUT_5POINT1_BACK or AV_CH_FRONT_LEFT_OF_CENTER or AV_CH_FRONT_RIGHT_OF_CENTER); AV_CH_LAYOUT_OCTAGONAL = (AV_CH_LAYOUT_5POINT0 or AV_CH_BACK_LEFT or AV_CH_BACK_CENTER or AV_CH_BACK_RIGHT); AV_CH_LAYOUT_STEREO_DOWNMIX = (AV_CH_STEREO_LEFT or AV_CH_STEREO_RIGHT); Type TAVMatrixEncoding = ( // AV_MATRIX_ENCODING_NONE, // AV_MATRIX_ENCODING_DOLBY, // AV_MATRIX_ENCODING_DPLII, // AV_MATRIX_ENCODING_DPLIIX, // AV_MATRIX_ENCODING_DPLIIZ, // AV_MATRIX_ENCODING_DOLBYEX, // AV_MATRIX_ENCODING_DOLBYHEADPHONE, // AV_MATRIX_ENCODING_NB); (* * * @} *) (* * * Return a channel layout id that matches name, or 0 if no match is found. * * name can be one or several of the following notations, * separated by '+' or ' or ': * - the name of an usual channel layout (mono, stereo, 4.0, quad, 5.0, * 5.0(side), 5.1, 5.1(side), 7.1, 7.1(wide), downmix); * - the name of a single channel (FL, FR, FC, LFE, BL, BR, FLC, FRC, BC, * SL, SR, TC, TFL, TFC, TFR, TBL, TBC, TBR, DL, DR); * - a number of channels, in decimal, optionally followed by 'c', yielding * the default channel layout for that number of channels (@see * av_get_default_channel_layout); * - a channel layout mask, in hexadecimal starting with "$" (see the * AV_CH_* macros). * * @warning Starting from the next major bump the trailing character * 'c' to specify a number of channels will be required, while a * channel layout mask could also be specified as a decimal number * (if and only if not followed by "c"). * * Example: "stereo+FC" = "2c+FC" = "2c+1c" = "$7" *) // uint64_t av_get_channel_layout(const char *name); (* * * Return a description of a channel layout. * If nb_channels is <= 0, it is guessed from the channel_layout. * * @param buf put here the string containing the channel layout * @param buf_size size in bytes of the buffer *) // void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout); // struct AVBPrint; (* * * Append a description of a channel layout to a bprint buffer. *) // void av_bprint_channel_layout(struct AVBPrint *bp, int nb_channels, uint64_t channel_layout); (* * * Return the number of channels in the channel layout. *) // int av_get_channel_layout_nb_channels(uint64_t channel_layout); function av_get_channel_layout_nb_channels(channel_layout: uint64_t): Integer; cdecl; (* * * Return default channel layout for a given number of channels. *) // int64_t av_get_default_channel_layout(int nb_channels); (* * * Get the index of a channel in channel_layout. * * @param channel a channel layout describing exactly one channel which must be * present in channel_layout. * * @return index of channel in channel_layout on success, a negative AVERROR * on error. *) // int av_get_channel_layout_channel_index(uint64_t channel_layout,uint64_t channel); (* * * Get the channel with the given index in channel_layout. *) // uint64_t av_channel_layout_extract_channel(uint64_t channel_layout, int index); (* * * Get the name of a given channel. * * @return channel name on success, NULL on error. *) // const char *av_get_channel_name(uint64_t channel); (* * * Get the description of a given channel. * * @param channel a channel layout with a single channel * @return channel description on success, NULL on error *) // const char *av_get_channel_description(uint64_t channel); (* * * Get the value and name of a standard channel layout. * * @param[in] index index in an internal list, starting at 0 * @param[out] layout channel layout mask * @param[out] name name of the layout * @return 0 if the layout exists, * <0 if index is beyond the limits *) // int av_get_standard_channel_layout(unsigned index, uint64_t *layout, const char **name); implementation uses ffm.lib; function av_get_channel_layout_nb_channels; external avutil_dll; end.