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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 <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.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,
};
struct MovChannelLayoutMap {
union {
uint32_t tag;
enum AVChannel id;
};
};
#define TAG(_0) {.tag = _0}
#define ID(_0) {.id = c_##_0}
#define CHLIST(_0, ...) TAG(_0), __VA_ARGS__
#define CHLIST01(_0, _1) CHLIST(_0, ID(_1))
#define CHLIST02(_0, _1, _2) CHLIST(_0, ID(_1), ID(_2))
#define CHLIST03(_0, _1, _2, _3) CHLIST(_0, ID(_1), ID(_2), ID(_3))
#define CHLIST04(_0, _1, _2, _3, _4) CHLIST(_0, ID(_1), ID(_2), ID(_3), ID(_4))
#define CHLIST05(_0, _1, _2, _3, _4, _5) CHLIST(_0, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5))
#define CHLIST06(_0, _1, _2, _3, _4, _5, _6) CHLIST(_0, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6))
#define CHLIST07(_0, _1, _2, _3, _4, _5, _6, _7) CHLIST(_0, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7))
#define CHLIST08(_0, _1, _2, _3, _4, _5, _6, _7, _8) CHLIST(_0, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7), ID(_8))
#define CHLIST09(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9) CHLIST(_0, ID(_1), ID(_2), ID(_3), ID(_4), ID(_5), ID(_6), ID(_7), ID(_8), ID(_9))
#define CHLIST16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
CHLIST(_0, 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(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21) \
CHLIST(_0, 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))
static const struct MovChannelLayoutMap 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 ), //C, sides
CHLIST02( MOV_CH_LAYOUT_XY, L, R ), //X (left ), Y (right )
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),
};
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)
{
#if defined(ASSERT_LEVEL) && ASSERT_LEVEL > 1
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(mov_ch_layout_map); i += 1 + (mov_ch_layout_map[i].tag & 0xffff))
av_assert2(mov_ch_layout_map[i].tag & 0xffff0000);
av_assert2(i == FF_ARRAY_ELEMS(mov_ch_layout_map));
}
#endif
for (int i = 0; i < FF_ARRAY_ELEMS(mov_ch_layout_map); i += 1 + (mov_ch_layout_map[i].tag & 0xffff))
if (mov_ch_layout_map[i].tag == tag)
return &mov_ch_layout_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)
{
int i, channels;
const struct MovChannelLayoutMap *layout_map;
channels = tag & 0xFFFF;
/* find the channel layout for the specified layout tag */
layout_map = find_layout_map(tag);
if (layout_map) {
int ret;
av_channel_layout_uninit(ch_layout);
ret = av_channel_layout_custom_init(ch_layout, channels);
if (ret < 0)
return ret;
for (i = 0; i < channels; i++) {
enum AVChannel id = layout_map[i].id;
ch_layout->u.map[i].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;
}
int ff_mov_get_channel_layout_tag(const AVCodecParameters *par,
uint32_t *layout,
uint32_t *bitmap,
uint32_t **pchannel_desc)
{
int i, j;
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) {
int channels;
const struct MovChannelLayoutMap *layout_map;
/* get the layout map based on the channel count */
channels = par->ch_layout.nb_channels;
/* find the layout tag for the specified channel layout */
for (i = 0; layouts[i] != 0; i++) {
if ((layouts[i] & 0xFFFF) != channels)
continue;
layout_map = find_layout_map(layouts[i]);
if (layout_map) {
for (j = 0; j < channels; j++) {
if (av_channel_layout_channel_from_index(&par->ch_layout, j) != layout_map[j].id)
break;
}
if (j == channels)
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);
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, 8.2 */
static const AVChannelLayout iso_channel_configuration[] = {
// 0: any setup
{0},
// 1: centre front
AV_CHANNEL_LAYOUT_MONO,
// 2: left front, right front
AV_CHANNEL_LAYOUT_STEREO,
// 3: centre front, left front, right front
AV_CHANNEL_LAYOUT_SURROUND,
// 4: centre front, left front, right front, rear centre
AV_CHANNEL_LAYOUT_4POINT0,
// 5: centre front, left front, right front, left surround, right surround
AV_CHANNEL_LAYOUT_5POINT0,
// 6: 5 + LFE
AV_CHANNEL_LAYOUT_5POINT1,
// 7: centre front, left front centre, right front centre,
// left front, right front, left surround, right surround, LFE
AV_CHANNEL_LAYOUT_7POINT1_WIDE,
// 8: channel1, channel2
AV_CHANNEL_LAYOUT_STEREO_DOWNMIX,
// 9: left front, right front, rear centre
AV_CHANNEL_LAYOUT_2_1,
// 10: left front, right front, left surround, right surround
AV_CHANNEL_LAYOUT_2_2,
// 11: centre front, left front, right front, left surround, right surround, rear centre, LFE
AV_CHANNEL_LAYOUT_6POINT1,
// 12: centre front, left front, right front
// left surround, right surround
// rear surround left, rear surround right
// LFE
AV_CHANNEL_LAYOUT_7POINT1,
// 13:
AV_CHANNEL_LAYOUT_22POINT2,
// 14:
AV_CHANNEL_LAYOUT_7POINT1_TOP_BACK,
// TODO: 15 - 20
};
/* 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; i < FF_ARRAY_ELEMS(iso_channel_configuration); i++) {
if (!av_channel_layout_compare(layout, iso_channel_configuration + i)) {
*config = i;
break;
}
}
return 0;
}
int ff_mov_get_channel_layout_from_config(int config, AVChannelLayout *layout)
{
if (config > 0 && config < FF_ARRAY_ELEMS(iso_channel_configuration)) {
av_channel_layout_copy(layout, &iso_channel_configuration[config]);
return 0;
}
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);
if (omitted_channel_map) {
avpriv_request_sample(s, "omitted_channel_map 0x%" PRIx64 " != 0",
omitted_channel_map);
return AVERROR_PATCHWELCOME;
}
ff_mov_get_channel_layout_from_config(layout, &st->codecpar->ch_layout);
}
}
// 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;
}