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FFmpeg/libavformat/mov_chan.c

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/*
* Copyright (c) 2011 Justin Ruggles
*
* 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
*/
/**
* mov 'chan' tag reading/writing.
* @author Justin Ruggles
*/
#include <assert.h>
#include <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "libavcodec/codec_id.h"
#include "mov_chan.h"
enum {
c_L = AV_CHAN_FRONT_LEFT,
c_R = AV_CHAN_FRONT_RIGHT,
c_C = AV_CHAN_FRONT_CENTER,
c_LFE = AV_CHAN_LOW_FREQUENCY,
c_Rls = AV_CHAN_BACK_LEFT,
c_Rrs = AV_CHAN_BACK_RIGHT,
c_Lc = AV_CHAN_FRONT_LEFT_OF_CENTER,
c_Rc = AV_CHAN_FRONT_RIGHT_OF_CENTER,
c_Cs = AV_CHAN_BACK_CENTER,
c_Ls = AV_CHAN_SIDE_LEFT,
c_Rs = AV_CHAN_SIDE_RIGHT,
c_Ts = AV_CHAN_TOP_CENTER,
c_Vhl = AV_CHAN_TOP_FRONT_LEFT,
c_Vhc = AV_CHAN_TOP_FRONT_CENTER,
c_Vhr = AV_CHAN_TOP_FRONT_RIGHT,
c_Rlt = AV_CHAN_TOP_BACK_LEFT,
// = AV_CHAN_TOP_BACK_CENTER,
c_Rrt = AV_CHAN_TOP_BACK_RIGHT,
c_Lt = AV_CHAN_STEREO_LEFT,
c_Rt = AV_CHAN_STEREO_RIGHT,
c_Lw = AV_CHAN_WIDE_LEFT,
c_Rw = AV_CHAN_WIDE_RIGHT,
c_Lsd = AV_CHAN_SURROUND_DIRECT_LEFT,
c_Rsd = AV_CHAN_SURROUND_DIRECT_RIGHT,
c_LFE2 = AV_CHAN_LOW_FREQUENCY_2,
// = AV_CHAN_TOP_SIDE_LEFT,
// = AV_CHAN_TOP_SIDE_RIGHT,
// = AV_CHAN_BOTTOM_FRONT_CENTER,
// = AV_CHAN_BOTTOM_FRONT_LEFT,
// = AV_CHAN_BOTTOM_FRONT_RIGHT,
c_W = AV_CHAN_AMBISONIC_BASE,
c_Y = AV_CHAN_AMBISONIC_BASE + 1,
c_Z = AV_CHAN_AMBISONIC_BASE + 2,
c_X = AV_CHAN_AMBISONIC_BASE + 3,
/* The following have no exact counterparts */
c_LFE1 = AV_CHAN_LOW_FREQUENCY,
c_Csd = AV_CHAN_NONE,
c_HI = AV_CHAN_NONE,
c_VI = AV_CHAN_NONE,
c_Haptic = AV_CHAN_NONE,
};
enum {
iso_L = AV_CHAN_FRONT_LEFT,
iso_R = AV_CHAN_FRONT_RIGHT,
iso_C = AV_CHAN_FRONT_CENTER,
iso_LFE = AV_CHAN_LOW_FREQUENCY,
iso_Lsr = AV_CHAN_BACK_LEFT,
iso_Rsr = AV_CHAN_BACK_RIGHT,
iso_Lc = AV_CHAN_FRONT_LEFT_OF_CENTER,
iso_Rc = AV_CHAN_FRONT_RIGHT_OF_CENTER,
iso_Cs = AV_CHAN_BACK_CENTER,
/* Side and surround are not exactly the same, but in order to have
* consistent 5.1/7.1 layouts we map them to the side channels. */
iso_Ls = AV_CHAN_SIDE_LEFT,
iso_Lss = AV_CHAN_SIDE_LEFT,
iso_Rs = AV_CHAN_SIDE_RIGHT,
iso_Rss = AV_CHAN_SIDE_RIGHT,
iso_Ts = AV_CHAN_TOP_CENTER,
iso_Lv = AV_CHAN_TOP_FRONT_LEFT,
iso_Cv = AV_CHAN_TOP_FRONT_CENTER,
iso_Rv = AV_CHAN_TOP_FRONT_RIGHT,
iso_Lvr = AV_CHAN_TOP_BACK_LEFT,
iso_Cvr = AV_CHAN_TOP_BACK_CENTER,
iso_Rvr = AV_CHAN_TOP_BACK_RIGHT,
// = AV_CHAN_STEREO_LEFT,
// = AV_CHAN_STEREO_RIGHT,
iso_Lw = AV_CHAN_WIDE_LEFT,
iso_Rw = AV_CHAN_WIDE_RIGHT,
iso_Lsd = AV_CHAN_SURROUND_DIRECT_LEFT,
iso_Rsd = AV_CHAN_SURROUND_DIRECT_RIGHT,
iso_LFE2 = AV_CHAN_LOW_FREQUENCY_2,
iso_Lvss = AV_CHAN_TOP_SIDE_LEFT,
iso_Rvss = AV_CHAN_TOP_SIDE_RIGHT,
iso_Cb = AV_CHAN_BOTTOM_FRONT_CENTER,
iso_Lb = AV_CHAN_BOTTOM_FRONT_LEFT,
iso_Rb = AV_CHAN_BOTTOM_FRONT_RIGHT,
/* The following have no exact counterparts */
iso_Lvs = AV_CHAN_NONE,
iso_Rvs = AV_CHAN_NONE,
};
struct MovChannelLayoutMap {
union {
uint32_t tag;
enum AVChannel id;
};
};
#define TAG(_tag, _cnt) {.tag = _tag}
#define ID(_0) {.id = c_##_0}
#define CHLIST01(_tag, _1) CHLIST(_tag, 1, ID(_1))
#define CHLIST02(_tag, _1, _2) CHLIST(_tag, 2, ID(_1), ID(_2))
#define CHLIST03(_tag, _1, _2, _3) CHLIST(_tag, 3, ID(_1), ID(_2), ID(_3))
#define CHLIST04(_tag, _1, _2, _3, _4) CHLIST(_tag, 4, ID(_1), ID(_2), ID(_3), ID(_4))
#define CHLIST05(_tag, _1, _2, _3, _4, _5) CHLIST(_tag, 5, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5))
#define CHLIST06(_tag, _1, _2, _3, _4, _5, _6) CHLIST(_tag, 6, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6))
#define CHLIST07(_tag, _1, _2, _3, _4, _5, _6, _7) CHLIST(_tag, 7, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7))
#define CHLIST08(_tag, _1, _2, _3, _4, _5, _6, _7, _8) CHLIST(_tag, 8, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7), ID(_8))
#define CHLIST09(_tag, _1, _2, _3, _4, _5, _6, _7, _8, _9) CHLIST(_tag, 9, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7), ID(_8), ID(_9))
#define CHLIST16(_tag, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
CHLIST(_tag, 16, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7), ID(_8), ID(_9), ID(_10), \
ID(_11), ID(_12), ID(_13), ID(_14), ID(_15), ID(_16))
#define CHLIST21(_tag, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21) \
CHLIST(_tag, 21, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7), ID(_8), ID(_9), ID(_10), \
ID(_11), ID(_12), ID(_13), ID(_14), ID(_15), ID(_16), ID(_17), ID(_18), ID(_19), ID(_20), ID(_21))
#define CHLIST24(_tag, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24) \
CHLIST(_tag, 24, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7), ID(_8), ID(_9), ID(_10), \
ID(_11), ID(_12), ID(_13), ID(_14), ID(_15), ID(_16), ID(_17), ID(_18), ID(_19), ID(_20), \
ID(_21), ID(_22), ID(_23), ID(_24))
#define MOV_CH_LAYOUT_MAP \
CHLIST01( MOV_CH_LAYOUT_MONO, C )\
CHLIST02( MOV_CH_LAYOUT_STEREO, L, R )\
CHLIST02( MOV_CH_LAYOUT_STEREOHEADPHONES, L, R )\
CHLIST02( MOV_CH_LAYOUT_BINAURAL, L, R )\
CHLIST02( MOV_CH_LAYOUT_MIDSIDE, L, R )\
CHLIST02( MOV_CH_LAYOUT_XY, L, R )\
CHLIST02( MOV_CH_LAYOUT_MATRIXSTEREO, Lt, Rt )\
CHLIST02( MOV_CH_LAYOUT_AC3_1_0_1, C, LFE )\
CHLIST03( MOV_CH_LAYOUT_MPEG_3_0_A, L, R, C )\
CHLIST03( MOV_CH_LAYOUT_MPEG_3_0_B, C, L, R )\
CHLIST03( MOV_CH_LAYOUT_AC3_3_0, L, C, R )\
CHLIST03( MOV_CH_LAYOUT_ITU_2_1, L, R, Cs )\
CHLIST03( MOV_CH_LAYOUT_DVD_4, L, R, LFE )\
CHLIST04( MOV_CH_LAYOUT_AMBISONIC_B_FORMAT, W, X, Y, Z )\
CHLIST04( MOV_CH_LAYOUT_QUADRAPHONIC, L, R, Rls, Rrs )\
CHLIST04( MOV_CH_LAYOUT_MPEG_4_0_A, L, R, C, Cs )\
CHLIST04( MOV_CH_LAYOUT_MPEG_4_0_B, C, L, R, Cs )\
CHLIST04( MOV_CH_LAYOUT_AC3_3_1, L, C, R, Cs )\
CHLIST04( MOV_CH_LAYOUT_ITU_2_2, L, R, Ls, Rs )\
CHLIST04( MOV_CH_LAYOUT_DVD_5, L, R, LFE, Cs )\
CHLIST04( MOV_CH_LAYOUT_AC3_2_1_1, L, R, Cs, LFE )\
CHLIST04( MOV_CH_LAYOUT_DVD_10, L, R, C, LFE )\
CHLIST04( MOV_CH_LAYOUT_AC3_3_0_1, L, C, R, LFE )\
CHLIST04( MOV_CH_LAYOUT_DTS_3_1, C, L, R, LFE )\
CHLIST05( MOV_CH_LAYOUT_PENTAGONAL, L, R, Rls, Rrs, C )\
CHLIST05( MOV_CH_LAYOUT_MPEG_5_0_A, L, R, C, Ls, Rs )\
CHLIST05( MOV_CH_LAYOUT_MPEG_5_0_B, L, R, Ls, Rs, C )\
CHLIST05( MOV_CH_LAYOUT_MPEG_5_0_C, L, C, R, Ls, Rs )\
CHLIST05( MOV_CH_LAYOUT_MPEG_5_0_D, C, L, R, Ls, Rs )\
CHLIST05( MOV_CH_LAYOUT_DVD_6, L, R, LFE, Ls, Rs )\
CHLIST05( MOV_CH_LAYOUT_DVD_18, L, R, Ls, Rs, LFE )\
CHLIST05( MOV_CH_LAYOUT_DVD_11, L, R, C, LFE, Cs )\
CHLIST05( MOV_CH_LAYOUT_AC3_3_1_1, L, C, R, Cs, LFE )\
CHLIST05( MOV_CH_LAYOUT_DTS_4_1, C, L, R, Cs, LFE )\
CHLIST06( MOV_CH_LAYOUT_HEXAGONAL, L, R, Rls, Rrs, C, Cs )\
CHLIST06( MOV_CH_LAYOUT_DTS_6_0_C, C, Cs, L, R, Rls, Rrs )\
CHLIST06( MOV_CH_LAYOUT_MPEG_5_1_A, L, R, C, LFE, Ls, Rs )\
CHLIST06( MOV_CH_LAYOUT_MPEG_5_1_B, L, R, Ls, Rs, C, LFE )\
CHLIST06( MOV_CH_LAYOUT_MPEG_5_1_C, L, C, R, Ls, Rs, LFE )\
CHLIST06( MOV_CH_LAYOUT_MPEG_5_1_D, C, L, R, Ls, Rs, LFE )\
CHLIST06( MOV_CH_LAYOUT_AUDIOUNIT_6_0, L, R, Ls, Rs, C, Cs )\
CHLIST06( MOV_CH_LAYOUT_AAC_6_0, C, L, R, Ls, Rs, Cs )\
CHLIST06( MOV_CH_LAYOUT_EAC3_6_0_A, L, C, R, Ls, Rs, Cs )\
CHLIST06( MOV_CH_LAYOUT_DTS_6_0_A, Lc, Rc, L, R, Ls, Rs )\
CHLIST06( MOV_CH_LAYOUT_DTS_6_0_B, C, L, R, Rls, Rrs, Ts )\
CHLIST07( MOV_CH_LAYOUT_MPEG_6_1_A, L, R, C, LFE, Ls, Rs, Cs )\
CHLIST07( MOV_CH_LAYOUT_AAC_6_1, C, L, R, Ls, Rs, Cs, LFE )\
CHLIST07( MOV_CH_LAYOUT_EAC3_6_1_A, L, C, R, Ls, Rs, LFE, Cs )\
CHLIST07( MOV_CH_LAYOUT_DTS_6_1_D, C, L, R, Ls, Rs, LFE, Cs )\
CHLIST07( MOV_CH_LAYOUT_AUDIOUNIT_7_0, L, R, Ls, Rs, C, Rls, Rrs )\
CHLIST07( MOV_CH_LAYOUT_AAC_7_0, C, L, R, Ls, Rs, Rls, Rrs )\
CHLIST07( MOV_CH_LAYOUT_EAC3_7_0_A, L, C, R, Ls, Rs, Rls, Rrs )\
CHLIST07( MOV_CH_LAYOUT_AUDIOUNIT_7_0_FRONT, L, R, Ls, Rs, C, Lc, Rc )\
CHLIST07( MOV_CH_LAYOUT_DTS_7_0, Lc, C, Rc, L, R, Ls, Rs )\
CHLIST07( MOV_CH_LAYOUT_EAC3_6_1_B, L, C, R, Ls, Rs, LFE, Ts )\
CHLIST07( MOV_CH_LAYOUT_EAC3_6_1_C, L, C, R, Ls, Rs, LFE, Vhc )\
CHLIST07( MOV_CH_LAYOUT_DTS_6_1_A, Lc, Rc, L, R, Ls, Rs, LFE )\
CHLIST07( MOV_CH_LAYOUT_DTS_6_1_B, C, L, R, Rls, Rrs, Ts, LFE )\
CHLIST07( MOV_CH_LAYOUT_DTS_6_1_C, C, Cs, L, R, Rls, Rrs, LFE )\
CHLIST08( MOV_CH_LAYOUT_OCTAGONAL, L, R, Rls, Rrs, C, Cs, Ls, Rs )\
CHLIST08( MOV_CH_LAYOUT_AAC_OCTAGONAL, C, L, R, Ls, Rs, Rls, Rrs, Cs )\
CHLIST08( MOV_CH_LAYOUT_CUBE, L, R, Rls, Rrs, Vhl, Vhr, Rlt, Rrt )\
CHLIST08( MOV_CH_LAYOUT_MPEG_7_1_A, L, R, C, LFE, Ls, Rs, Lc, Rc )\
CHLIST08( MOV_CH_LAYOUT_MPEG_7_1_B, C, Lc, Rc, L, R, Ls, Rs, LFE )\
CHLIST08( MOV_CH_LAYOUT_EMAGIC_DEFAULT_7_1, L, R, Ls, Rs, C, LFE, Lc, Rc )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_B, L, C, R, Ls, Rs, LFE, Lc, Rc )\
CHLIST08( MOV_CH_LAYOUT_DTS_7_1, Lc, C, Rc, L, R, Ls, Rs, LFE )\
CHLIST08( MOV_CH_LAYOUT_MPEG_7_1_C, L, R, C, LFE, Ls, Rs, Rls, Rrs )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_A, L, C, R, Ls, Rs, LFE, Rls, Rrs )\
CHLIST08( MOV_CH_LAYOUT_SMPTE_DTV, L, R, C, LFE, Ls, Rs, Lt, Rt )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_C, L, C, R, Ls, Rs, LFE, Lsd, Rsd )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_D, L, C, R, Ls, Rs, LFE, Lw, Rw )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_E, L, C, R, Ls, Rs, LFE, Vhl, Vhr )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_F, L, C, R, Ls, Rs, LFE, Cs, Ts )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_G, L, C, R, Ls, Rs, LFE, Cs, Vhc )\
CHLIST08( MOV_CH_LAYOUT_EAC3_7_1_H, L, C, R, Ls, Rs, LFE, Ts, Vhc )\
CHLIST08( MOV_CH_LAYOUT_DTS_8_0_A, Lc, Rc, L, R, Ls, Rs, Rls, Rrs )\
CHLIST08( MOV_CH_LAYOUT_DTS_8_0_B, Lc, C, Rc, L, R, Ls, Cs, Rs )\
CHLIST09( MOV_CH_LAYOUT_DTS_8_1_A, Lc, Rc, L, R, Ls, Rs, Rls, Rrs, LFE )\
CHLIST09( MOV_CH_LAYOUT_DTS_8_1_B, Lc, C, Rc, L, R, Ls, Cs, Rs, LFE )\
CHLIST16( MOV_CH_LAYOUT_TMH_10_2_STD, L, R, C, Vhc, Lsd, Rsd, Ls, Rs, Vhl, Vhr, Lw, Rw, Csd, Cs, LFE1, LFE2 )\
CHLIST21( MOV_CH_LAYOUT_TMH_10_2_FULL, L, R, C, Vhc, Lsd, Rsd, Ls, Rs, Vhl, Vhr, Lw, Rw, Csd, Cs, LFE1, LFE2, Lc, Rc, HI, VI, Haptic )\
#define CHLIST(_tag, _cnt, ...) static_assert((_tag & 0xffff) == _cnt, "Channel count of " #_tag " is not " #_cnt);
MOV_CH_LAYOUT_MAP
#undef CHLIST
#define CHLIST(_tag, _cnt, ...) TAG(_tag, _cnt), __VA_ARGS__,
static const struct MovChannelLayoutMap mov_ch_layout_map[] = {
MOV_CH_LAYOUT_MAP
{ {0} },
};
#undef ID
#undef TAG
#define ID(_0) {.id = iso_##_0}
#define TAG(_tag, _cnt) {.tag = (_tag << 16) | _cnt}
/* ISO/IEC 23001-8 */
static const struct MovChannelLayoutMap iso_ch_layout_map[] = {
CHLIST01( 1, C )
CHLIST02( 2, L, R )
CHLIST03( 3, C, L, R )
CHLIST04( 4, C, L, R, Cs )
CHLIST05( 5, C, L, R, Ls, Rs )
CHLIST06( 6, C, L, R, Ls, Rs, LFE )
CHLIST08( 7, C, Lc, Rc, L, R, Ls, Rs, LFE )
CHLIST03( 9, L, R, Cs )
CHLIST04( 10, L, R, Ls, Rs )
CHLIST07( 11, C, L, R, Ls, Rs, Cs, LFE )
CHLIST08( 12, C, L, R, Ls, Rs, Lsr, Rsr, LFE )
CHLIST24( 13, C, Lc, Rc, L, R, Lss, Rss, Lsr, Rsr, Cs, LFE, LFE2, Cv, Lv, Rv, Lvss, Rvss, Ts, Lvr, Rvr, Cvr, Cb, Lb, Rb)
CHLIST08( 14, C, L, R, Ls, Rs, LFE, Lv, Rv)
{ {0} },
};
static const enum MovChannelLayoutTag mov_ch_layouts_aac[] = {
MOV_CH_LAYOUT_MONO,
MOV_CH_LAYOUT_STEREO,
MOV_CH_LAYOUT_AC3_1_0_1,
MOV_CH_LAYOUT_MPEG_3_0_B,
MOV_CH_LAYOUT_ITU_2_1,
MOV_CH_LAYOUT_DVD_4,
MOV_CH_LAYOUT_QUADRAPHONIC,
MOV_CH_LAYOUT_MPEG_4_0_B,
MOV_CH_LAYOUT_ITU_2_2,
MOV_CH_LAYOUT_AC3_2_1_1,
MOV_CH_LAYOUT_DTS_3_1,
MOV_CH_LAYOUT_MPEG_5_0_D,
MOV_CH_LAYOUT_DVD_18,
MOV_CH_LAYOUT_DTS_4_1,
MOV_CH_LAYOUT_MPEG_5_1_D,
MOV_CH_LAYOUT_AAC_6_0,
MOV_CH_LAYOUT_DTS_6_0_A,
MOV_CH_LAYOUT_AAC_6_1,
MOV_CH_LAYOUT_AAC_7_0,
MOV_CH_LAYOUT_DTS_6_1_A,
MOV_CH_LAYOUT_AAC_OCTAGONAL,
MOV_CH_LAYOUT_MPEG_7_1_B,
MOV_CH_LAYOUT_DTS_8_0_A,
0,
};
static const enum MovChannelLayoutTag mov_ch_layouts_ac3[] = {
MOV_CH_LAYOUT_MONO,
MOV_CH_LAYOUT_STEREO,
MOV_CH_LAYOUT_AC3_1_0_1,
MOV_CH_LAYOUT_AC3_3_0,
MOV_CH_LAYOUT_ITU_2_1,
MOV_CH_LAYOUT_DVD_4,
MOV_CH_LAYOUT_AC3_3_1,
MOV_CH_LAYOUT_ITU_2_2,
MOV_CH_LAYOUT_AC3_2_1_1,
MOV_CH_LAYOUT_AC3_3_0_1,
MOV_CH_LAYOUT_MPEG_5_0_C,
MOV_CH_LAYOUT_DVD_18,
MOV_CH_LAYOUT_AC3_3_1_1,
MOV_CH_LAYOUT_MPEG_5_1_C,
0,
};
static const enum MovChannelLayoutTag mov_ch_layouts_alac[] = {
MOV_CH_LAYOUT_MONO,
MOV_CH_LAYOUT_STEREO,
MOV_CH_LAYOUT_MPEG_3_0_B,
MOV_CH_LAYOUT_MPEG_4_0_B,
MOV_CH_LAYOUT_MPEG_5_0_D,
MOV_CH_LAYOUT_MPEG_5_1_D,
MOV_CH_LAYOUT_AAC_6_1,
MOV_CH_LAYOUT_MPEG_7_1_B,
0,
};
static const enum MovChannelLayoutTag mov_ch_layouts_wav[] = {
MOV_CH_LAYOUT_MONO,
MOV_CH_LAYOUT_STEREO,
MOV_CH_LAYOUT_MATRIXSTEREO,
MOV_CH_LAYOUT_MPEG_3_0_A,
MOV_CH_LAYOUT_QUADRAPHONIC,
MOV_CH_LAYOUT_MPEG_5_0_A,
MOV_CH_LAYOUT_MPEG_5_1_A,
MOV_CH_LAYOUT_MPEG_6_1_A,
MOV_CH_LAYOUT_MPEG_7_1_A,
MOV_CH_LAYOUT_MPEG_7_1_C,
MOV_CH_LAYOUT_SMPTE_DTV,
0,
};
static const struct {
enum AVCodecID codec_id;
const enum MovChannelLayoutTag *layouts;
} mov_codec_ch_layouts[] = {
{ AV_CODEC_ID_AAC, mov_ch_layouts_aac },
{ AV_CODEC_ID_AC3, mov_ch_layouts_ac3 },
{ AV_CODEC_ID_ALAC, mov_ch_layouts_alac },
{ AV_CODEC_ID_PCM_U8, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_S8, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_S16LE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_S16BE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_S24LE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_S24BE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_S32LE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_S32BE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_F32LE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_F32BE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_F64LE, mov_ch_layouts_wav },
{ AV_CODEC_ID_PCM_F64BE, mov_ch_layouts_wav },
{ AV_CODEC_ID_NONE, NULL },
};
static const struct MovChannelLayoutMap* find_layout_map(uint32_t tag, const struct MovChannelLayoutMap *map)
{
for (int i = 0; map[i].tag & 0xffff; i += 1 + (map[i].tag & 0xffff))
if (map[i].tag == tag)
return &map[i + 1];
return NULL;
}
/**
* Get the channel layout for the specified non-special channel layout tag if
* known.
*
* @param[in,out] ch_layout channel layout
* @param[in] tag channel layout tag
* @return <0 on error
*/
static int mov_get_channel_layout(AVChannelLayout *ch_layout, uint32_t tag, uint64_t omitted_channel_map, const struct MovChannelLayoutMap *map)
{
const struct MovChannelLayoutMap *layout_map;
/* find the channel layout for the specified layout tag */
layout_map = find_layout_map(tag, map);
if (layout_map) {
int ret;
int map_layout_nb_channels = tag & 0xFFFF;
int nb_channels = ch_layout->nb_channels;
/* Omitted channel bits must not exceed number of channels in map */
if (omitted_channel_map >> map_layout_nb_channels)
return AVERROR_INVALIDDATA;
av_channel_layout_uninit(ch_layout);
ret = av_channel_layout_custom_init(ch_layout, nb_channels);
if (ret < 0)
return ret;
for (int i = 0, idx = 0; i < map_layout_nb_channels && idx < nb_channels; i++, omitted_channel_map >>= 1) {
if (!(omitted_channel_map & 1)) {
enum AVChannel id = layout_map[i].id;
ch_layout->u.map[idx++].id = (id != AV_CHAN_NONE ? id : AV_CHAN_UNKNOWN);
}
}
return av_channel_layout_retype(ch_layout, 0, AV_CHANNEL_LAYOUT_RETYPE_FLAG_CANONICAL);
}
return 0;
}
static enum AVChannel mov_get_channel_id(uint32_t label)
{
if (label == 0)
return AV_CHAN_UNUSED;
if (label <= 18)
return (label - 1);
if (label == 35)
return AV_CHAN_WIDE_LEFT;
if (label == 36)
return AV_CHAN_WIDE_RIGHT;
if (label == 37)
return AV_CHAN_LOW_FREQUENCY_2;
if (label == 38)
return AV_CHAN_STEREO_LEFT;
if (label == 39)
return AV_CHAN_STEREO_RIGHT;
return AV_CHAN_UNKNOWN;
}
static uint32_t mov_get_channel_label(enum AVChannel channel)
{
if (channel < 0)
return 0;
if (channel <= AV_CHAN_TOP_BACK_RIGHT)
return channel + 1;
if (channel == AV_CHAN_WIDE_LEFT)
return 35;
if (channel == AV_CHAN_WIDE_RIGHT)
return 36;
if (channel == AV_CHAN_LOW_FREQUENCY_2)
return 37;
if (channel == AV_CHAN_STEREO_LEFT)
return 38;
if (channel == AV_CHAN_STEREO_RIGHT)
return 39;
return 0;
}
static int is_layout_valid_for_tag(const AVChannelLayout *ch_layout, uint32_t tag, const struct MovChannelLayoutMap *map)
{
const struct MovChannelLayoutMap *layout_map;
int channels = ch_layout->nb_channels;
/* get the layout map based on the channel count */
if ((tag & 0xFFFF) != channels)
return 0;
layout_map = find_layout_map(tag, map);
if (layout_map) {
int i;
for (i = 0; i < channels; i++) {
if (av_channel_layout_channel_from_index(ch_layout, i) != layout_map[i].id)
break;
}
if (i == channels)
return 1;
}
return 0;
}
int ff_mov_get_channel_layout_tag(const AVCodecParameters *par,
uint32_t *layout,
uint32_t *bitmap,
uint32_t **pchannel_desc)
{
int i;
uint32_t tag = 0;
const enum MovChannelLayoutTag *layouts = NULL;
/* find the layout list for the specified codec */
for (i = 0; mov_codec_ch_layouts[i].codec_id != AV_CODEC_ID_NONE; i++) {
if (mov_codec_ch_layouts[i].codec_id == par->codec_id)
break;
}
if (mov_codec_ch_layouts[i].codec_id != AV_CODEC_ID_NONE)
layouts = mov_codec_ch_layouts[i].layouts;
if (layouts) {
/* find the layout tag for the specified channel layout */
for (i = 0; layouts[i] != 0; i++)
if (is_layout_valid_for_tag(&par->ch_layout, layouts[i], mov_ch_layout_map))
break;
tag = layouts[i];
}
*layout = tag;
*bitmap = 0;
*pchannel_desc = NULL;
/* if no tag was found, use channel bitmap or description as a backup if possible */
if (tag == 0) {
uint32_t *channel_desc;
if (par->ch_layout.order == AV_CHANNEL_ORDER_NATIVE &&
par->ch_layout.u.mask < 0x40000) {
*layout = MOV_CH_LAYOUT_USE_BITMAP;
*bitmap = (uint32_t)par->ch_layout.u.mask;
return 0;
} else if (par->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
return AVERROR(ENOSYS);
channel_desc = av_malloc_array(par->ch_layout.nb_channels, sizeof(*channel_desc));
if (!channel_desc)
return AVERROR(ENOMEM);
for (i = 0; i < par->ch_layout.nb_channels; i++) {
channel_desc[i] =
mov_get_channel_label(av_channel_layout_channel_from_index(&par->ch_layout, i));
if (channel_desc[i] == 0) {
av_free(channel_desc);
return AVERROR(ENOSYS);
}
}
*pchannel_desc = channel_desc;
}
return 0;
}
int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st,
int64_t size)
{
uint32_t layout_tag, bitmap, num_descr;
int ret;
AVChannelLayout *ch_layout = &st->codecpar->ch_layout;
if (size < 12)
return AVERROR_INVALIDDATA;
layout_tag = avio_rb32(pb);
bitmap = avio_rb32(pb);
num_descr = avio_rb32(pb);
av_log(s, AV_LOG_DEBUG, "chan: layout=%"PRIu32" "
"bitmap=%"PRIu32" num_descr=%"PRIu32"\n",
layout_tag, bitmap, num_descr);
if (size < 12ULL + num_descr * 20ULL)
return 0;
if (layout_tag == MOV_CH_LAYOUT_USE_DESCRIPTIONS) {
int nb_channels = ch_layout->nb_channels ? ch_layout->nb_channels : num_descr;
if (num_descr > nb_channels) {
av_log(s, AV_LOG_WARNING, "got %d channel descriptions, capping to the number of channels %d\n",
num_descr, nb_channels);
num_descr = nb_channels;
}
av_channel_layout_uninit(ch_layout);
ret = av_channel_layout_custom_init(ch_layout, nb_channels);
if (ret < 0)
goto out;
for (int i = 0; i < num_descr; i++) {
uint32_t label;
if (pb->eof_reached) {
av_log(s, AV_LOG_ERROR,
"reached EOF while reading channel layout\n");
return AVERROR_INVALIDDATA;
}
label = avio_rb32(pb); // mChannelLabel
avio_rb32(pb); // mChannelFlags
avio_rl32(pb); // mCoordinates[0]
avio_rl32(pb); // mCoordinates[1]
avio_rl32(pb); // mCoordinates[2]
size -= 20;
ch_layout->u.map[i].id = mov_get_channel_id(label);
}
ret = av_channel_layout_retype(ch_layout, 0, AV_CHANNEL_LAYOUT_RETYPE_FLAG_CANONICAL);
if (ret < 0)
goto out;
} else if (layout_tag == MOV_CH_LAYOUT_USE_BITMAP) {
if (!ch_layout->nb_channels || av_popcount(bitmap) == ch_layout->nb_channels) {
if (bitmap < 0x40000) {
av_channel_layout_uninit(ch_layout);
av_channel_layout_from_mask(ch_layout, bitmap);
}
} else {
av_log(s, AV_LOG_WARNING, "ignoring channel layout bitmap with %d channels because number of channels is %d\n",
av_popcount64(bitmap), ch_layout->nb_channels);
}
} else if (layout_tag & 0xFFFF) {
int nb_channels = layout_tag & 0xFFFF;
if (!ch_layout->nb_channels)
ch_layout->nb_channels = nb_channels;
if (nb_channels == ch_layout->nb_channels) {
ret = mov_get_channel_layout(ch_layout, layout_tag, 0, mov_ch_layout_map);
if (ret < 0)
return ret;
} else {
av_log(s, AV_LOG_WARNING, "ignoring layout tag with %d channels because number of channels is %d\n",
nb_channels, ch_layout->nb_channels);
}
}
ret = 0;
out:
avio_skip(pb, size - 12);
return ret;
}
/* ISO/IEC 23001-8, table 8 */
static const enum AVChannel iso_channel_position[] = {
// 0: left front
AV_CHAN_FRONT_LEFT,
// 1: right front
AV_CHAN_FRONT_RIGHT,
// 2: centre front
AV_CHAN_FRONT_CENTER,
// 3: low frequence enhancement
AV_CHAN_LOW_FREQUENCY,
// 4: left surround
// TODO
AV_CHAN_NONE,
// 5: right surround
// TODO
AV_CHAN_NONE,
// 6: left front centre
AV_CHAN_FRONT_LEFT_OF_CENTER,
// 7: right front centre
AV_CHAN_FRONT_RIGHT_OF_CENTER,
// 8: rear surround left
AV_CHAN_BACK_LEFT,
// 9: rear surround right
AV_CHAN_BACK_RIGHT,
// 10: rear centre
AV_CHAN_BACK_CENTER,
// 11: left surround direct
AV_CHAN_SURROUND_DIRECT_LEFT,
// 12: right surround direct
AV_CHAN_SURROUND_DIRECT_RIGHT,
// 13: left side surround
AV_CHAN_SIDE_LEFT,
// 14: right side surround
AV_CHAN_SIDE_RIGHT,
// 15: left wide front
AV_CHAN_WIDE_LEFT,
// 16: right wide front
AV_CHAN_WIDE_RIGHT,
// 17: left front vertical height
AV_CHAN_TOP_FRONT_LEFT,
// 18: right front vertical height
AV_CHAN_TOP_FRONT_RIGHT,
// 19: centre front vertical height
AV_CHAN_TOP_FRONT_CENTER,
// 20: left surround vertical height rear
AV_CHAN_TOP_BACK_LEFT,
// 21: right surround vertical height rear
AV_CHAN_TOP_BACK_RIGHT,
// 22: centre vertical height rear
AV_CHAN_TOP_BACK_CENTER,
// 23: left vertical height side surround
AV_CHAN_TOP_SIDE_LEFT,
// 24: right vertical height side surround
AV_CHAN_TOP_SIDE_RIGHT,
// 25: top centre surround
AV_CHAN_TOP_CENTER,
// 26: low frequency enhancement 2
AV_CHAN_LOW_FREQUENCY_2,
// 27: left front vertical bottom
AV_CHAN_BOTTOM_FRONT_LEFT,
// 28: right front vertical bottom
AV_CHAN_BOTTOM_FRONT_RIGHT,
// 29: centre front vertical bottom
AV_CHAN_BOTTOM_FRONT_CENTER,
// 30: left vertical height surround
// TODO
AV_CHAN_NONE,
// 31: right vertical height surround
// TODO
AV_CHAN_NONE,
// 32, 33, 34, 35, reserved
AV_CHAN_NONE,
AV_CHAN_NONE,
AV_CHAN_NONE,
AV_CHAN_NONE,
// 36: low frequency enhancement 3
AV_CHAN_NONE,
// 37: left edge of screen
AV_CHAN_NONE,
// 38: right edge of screen
AV_CHAN_NONE,
// 39: half-way between centre of screen and left edge of screen
AV_CHAN_NONE,
// 40: half-way between centre of screen and right edge of screen
AV_CHAN_NONE,
// 41: left back surround
AV_CHAN_NONE,
// 42: right back surround
AV_CHAN_NONE,
// 43 - 125: reserved
// 126: explicit position
// 127: unknown /undefined
};
int ff_mov_get_channel_config_from_layout(const AVChannelLayout *layout, int *config)
{
// Set default value which means any setup in 23001-8
*config = 0;
for (int i = 0; iso_ch_layout_map[i].tag & 0xffff; i += 1 + (iso_ch_layout_map[i].tag & 0xffff)) {
if (is_layout_valid_for_tag(layout, iso_ch_layout_map[i].tag, &iso_ch_layout_map[i])) {
*config = iso_ch_layout_map[i].tag >> 16;
break;
}
}
return 0;
}
int ff_mov_get_channel_layout_from_config(int config, AVChannelLayout *layout, uint64_t omitted_channel_map)
{
if (config > 0) {
uint32_t layout_tag;
int nb_omitted_channels = av_popcount64(omitted_channel_map);
if (layout->nb_channels <= 0 || layout->nb_channels > UINT16_MAX - nb_omitted_channels)
return AVERROR_INVALIDDATA;
layout_tag = (config << 16) | (layout->nb_channels + nb_omitted_channels);
return mov_get_channel_layout(layout, layout_tag, omitted_channel_map, iso_ch_layout_map);
}
return 1;
}
int ff_mov_get_channel_positions_from_layout(const AVChannelLayout *layout,
uint8_t *position, int position_num)
{
enum AVChannel channel;
if (position_num < layout->nb_channels)
return AVERROR(EINVAL);
for (int i = 0; i < layout->nb_channels; i++) {
position[i] = 127;
channel = av_channel_layout_channel_from_index(layout, i);
if (channel == AV_CHAN_NONE)
return AVERROR(EINVAL);
for (int j = 0; j < FF_ARRAY_ELEMS(iso_channel_position); j++) {
if (iso_channel_position[j] == channel) {
position[i] = j;
break;
}
}
if (position[i] == 127)
return AVERROR(EINVAL);
}
return 0;
}
int ff_mov_read_chnl(AVFormatContext *s, AVIOContext *pb, AVStream *st)
{
int stream_structure = avio_r8(pb);
int ret;
// stream carries channels
if (stream_structure & 1) {
int layout = avio_r8(pb);
av_log(s, AV_LOG_TRACE, "'chnl' layout %d\n", layout);
if (!layout) {
AVChannelLayout *ch_layout = &st->codecpar->ch_layout;
int nb_channels = ch_layout->nb_channels;
av_channel_layout_uninit(ch_layout);
ret = av_channel_layout_custom_init(ch_layout, nb_channels);
if (ret < 0)
return ret;
for (int i = 0; i < nb_channels; i++) {
int speaker_pos = avio_r8(pb);
enum AVChannel channel;
if (speaker_pos == 126) // explicit position
avio_skip(pb, 3); // azimuth, elevation
if (speaker_pos >= FF_ARRAY_ELEMS(iso_channel_position))
channel = AV_CHAN_NONE;
else
channel = iso_channel_position[speaker_pos];
if (channel == AV_CHAN_NONE) {
av_log(s, AV_LOG_WARNING, "speaker position %d is not implemented\n", speaker_pos);
channel = AV_CHAN_UNKNOWN;
}
ch_layout->u.map[i].id = channel;
}
ret = av_channel_layout_retype(ch_layout, 0, AV_CHANNEL_LAYOUT_RETYPE_FLAG_CANONICAL);
if (ret < 0)
return ret;
} else {
uint64_t omitted_channel_map = avio_rb64(pb);
ret = ff_mov_get_channel_layout_from_config(layout, &st->codecpar->ch_layout, omitted_channel_map);
if (ret < 0)
return ret;
}
}
// stream carries objects
if (stream_structure & 2) {
int obj_count = avio_r8(pb);
av_log(s, AV_LOG_TRACE, "'chnl' with object_count %d\n", obj_count);
}
return 0;
}