/* * 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 #include "libavutil/channel_layout.h" #include "libavcodec/codec_id.h" #include "mov_chan.h" struct MovChannelLayoutMap { uint32_t tag; uint64_t layout; }; static const struct MovChannelLayoutMap mov_ch_layout_map_misc[] = { { MOV_CH_LAYOUT_USE_DESCRIPTIONS, 0 }, { MOV_CH_LAYOUT_USE_BITMAP, 0 }, { MOV_CH_LAYOUT_DISCRETEINORDER, 0 }, { MOV_CH_LAYOUT_UNKNOWN, 0 }, { MOV_CH_LAYOUT_TMH_10_2_STD, 0 }, // L, R, C, Vhc, Lsd, Rsd, // Ls, Rs, Vhl, Vhr, Lw, Rw, // Csd, Cs, LFE1, LFE2 { MOV_CH_LAYOUT_TMH_10_2_FULL, 0 }, // L, R, C, Vhc, Lsd, Rsd, // Ls, Rs, Vhl, Vhr, Lw, Rw, // Csd, Cs, LFE1, LFE2, Lc, Rc, // HI, VI, Haptic { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_1ch[] = { { MOV_CH_LAYOUT_MONO, AV_CH_LAYOUT_MONO }, // C { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_2ch[] = { { MOV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO }, // L, R { MOV_CH_LAYOUT_STEREOHEADPHONES, AV_CH_LAYOUT_STEREO }, // L, R { MOV_CH_LAYOUT_BINAURAL, AV_CH_LAYOUT_STEREO }, // L, R { MOV_CH_LAYOUT_MIDSIDE, AV_CH_LAYOUT_STEREO }, // C, sides { MOV_CH_LAYOUT_XY, AV_CH_LAYOUT_STEREO }, // X (left), Y (right) { MOV_CH_LAYOUT_MATRIXSTEREO, AV_CH_LAYOUT_STEREO_DOWNMIX }, // Lt, Rt { MOV_CH_LAYOUT_AC3_1_0_1, AV_CH_LAYOUT_MONO | // C, LFE AV_CH_LOW_FREQUENCY }, { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_3ch[] = { { MOV_CH_LAYOUT_MPEG_3_0_A, AV_CH_LAYOUT_SURROUND }, // L, R, C { MOV_CH_LAYOUT_MPEG_3_0_B, AV_CH_LAYOUT_SURROUND }, // C, L, R { MOV_CH_LAYOUT_AC3_3_0, AV_CH_LAYOUT_SURROUND }, // L, C, R { MOV_CH_LAYOUT_ITU_2_1, AV_CH_LAYOUT_2_1 }, // L, R, Cs { MOV_CH_LAYOUT_DVD_4, AV_CH_LAYOUT_2POINT1 }, // L, R, LFE { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_4ch[] = { { MOV_CH_LAYOUT_AMBISONIC_B_FORMAT, 0 }, // W, X, Y, Z { MOV_CH_LAYOUT_QUADRAPHONIC, AV_CH_LAYOUT_QUAD }, // L, R, Rls, Rrs { MOV_CH_LAYOUT_MPEG_4_0_A, AV_CH_LAYOUT_4POINT0 }, // L, R, C, Cs { MOV_CH_LAYOUT_MPEG_4_0_B, AV_CH_LAYOUT_4POINT0 }, // C, L, R, Cs { MOV_CH_LAYOUT_AC3_3_1, AV_CH_LAYOUT_4POINT0 }, // L, C, R, Cs { MOV_CH_LAYOUT_ITU_2_2, AV_CH_LAYOUT_2_2 }, // L, R, Ls, Rs { MOV_CH_LAYOUT_DVD_5, AV_CH_LAYOUT_2_1 | // L, R, LFE, Cs AV_CH_LOW_FREQUENCY }, { MOV_CH_LAYOUT_AC3_2_1_1, AV_CH_LAYOUT_2_1 | // L, R, Cs, LFE AV_CH_LOW_FREQUENCY }, { MOV_CH_LAYOUT_DVD_10, AV_CH_LAYOUT_3POINT1 }, // L, R, C, LFE { MOV_CH_LAYOUT_AC3_3_0_1, AV_CH_LAYOUT_3POINT1 }, // L, C, R, LFE { MOV_CH_LAYOUT_DTS_3_1, AV_CH_LAYOUT_3POINT1 }, // C, L, R, LFE { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_5ch[] = { { MOV_CH_LAYOUT_PENTAGONAL, AV_CH_LAYOUT_5POINT0_BACK }, // L, R, Rls, Rrs, C { MOV_CH_LAYOUT_MPEG_5_0_A, AV_CH_LAYOUT_5POINT0 }, // L, R, C, Ls, Rs { MOV_CH_LAYOUT_MPEG_5_0_B, AV_CH_LAYOUT_5POINT0 }, // L, R, Ls, Rs, C { MOV_CH_LAYOUT_MPEG_5_0_C, AV_CH_LAYOUT_5POINT0 }, // L, C, R, Ls, Rs { MOV_CH_LAYOUT_MPEG_5_0_D, AV_CH_LAYOUT_5POINT0 }, // C, L, R, Ls, Rs { MOV_CH_LAYOUT_DVD_6, AV_CH_LAYOUT_2_2 | // L, R, LFE, Ls, Rs AV_CH_LOW_FREQUENCY }, { MOV_CH_LAYOUT_DVD_18, AV_CH_LAYOUT_2_2 | // L, R, Ls, Rs, LFE AV_CH_LOW_FREQUENCY }, { MOV_CH_LAYOUT_DVD_11, AV_CH_LAYOUT_4POINT1 }, // L, R, C, LFE, Cs { MOV_CH_LAYOUT_AC3_3_1_1, AV_CH_LAYOUT_4POINT1 }, // L, C, R, Cs, LFE { MOV_CH_LAYOUT_DTS_4_1, AV_CH_LAYOUT_4POINT1 }, // C, L, R, Cs, LFE { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_6ch[] = { { MOV_CH_LAYOUT_HEXAGONAL, AV_CH_LAYOUT_HEXAGONAL }, // L, R, Rls, Rrs, C, Cs { MOV_CH_LAYOUT_DTS_6_0_C, AV_CH_LAYOUT_HEXAGONAL }, // C, Cs, L, R, Rls, Rrs { MOV_CH_LAYOUT_MPEG_5_1_A, AV_CH_LAYOUT_5POINT1 }, // L, R, C, LFE, Ls, Rs { MOV_CH_LAYOUT_MPEG_5_1_B, AV_CH_LAYOUT_5POINT1 }, // L, R, Ls, Rs, C, LFE { MOV_CH_LAYOUT_MPEG_5_1_C, AV_CH_LAYOUT_5POINT1 }, // L, C, R, Ls, Rs, LFE { MOV_CH_LAYOUT_MPEG_5_1_D, AV_CH_LAYOUT_5POINT1 }, // C, L, R, Ls, Rs, LFE { MOV_CH_LAYOUT_AUDIOUNIT_6_0, AV_CH_LAYOUT_6POINT0 }, // L, R, Ls, Rs, C, Cs { MOV_CH_LAYOUT_AAC_6_0, AV_CH_LAYOUT_6POINT0 }, // C, L, R, Ls, Rs, Cs { MOV_CH_LAYOUT_EAC3_6_0_A, AV_CH_LAYOUT_6POINT0 }, // L, C, R, Ls, Rs, Cs { MOV_CH_LAYOUT_DTS_6_0_A, AV_CH_LAYOUT_6POINT0_FRONT }, // Lc, Rc, L, R, Ls, Rs { MOV_CH_LAYOUT_DTS_6_0_B, AV_CH_LAYOUT_5POINT0_BACK | // C, L, R, Rls, Rrs, Ts AV_CH_TOP_CENTER }, { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_7ch[] = { { MOV_CH_LAYOUT_MPEG_6_1_A, AV_CH_LAYOUT_6POINT1 }, // L, R, C, LFE, Ls, Rs, Cs { MOV_CH_LAYOUT_AAC_6_1, AV_CH_LAYOUT_6POINT1 }, // C, L, R, Ls, Rs, Cs, LFE { MOV_CH_LAYOUT_EAC3_6_1_A, AV_CH_LAYOUT_6POINT1 }, // L, C, R, Ls, Rs, LFE, Cs { MOV_CH_LAYOUT_DTS_6_1_D, AV_CH_LAYOUT_6POINT1 }, // C, L, R, Ls, Rs, LFE, Cs { MOV_CH_LAYOUT_AUDIOUNIT_7_0, AV_CH_LAYOUT_7POINT0 }, // L, R, Ls, Rs, C, Rls, Rrs { MOV_CH_LAYOUT_AAC_7_0, AV_CH_LAYOUT_7POINT0 }, // C, L, R, Ls, Rs, Rls, Rrs { MOV_CH_LAYOUT_EAC3_7_0_A, AV_CH_LAYOUT_7POINT0 }, // L, C, R, Ls, Rs, Rls, Rrs { MOV_CH_LAYOUT_AUDIOUNIT_7_0_FRONT, AV_CH_LAYOUT_7POINT0_FRONT }, // L, R, Ls, Rs, C, Lc, Rc { MOV_CH_LAYOUT_DTS_7_0, AV_CH_LAYOUT_7POINT0_FRONT }, // Lc, C, Rc, L, R, Ls, Rs { MOV_CH_LAYOUT_EAC3_6_1_B, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Ts AV_CH_TOP_CENTER }, { MOV_CH_LAYOUT_EAC3_6_1_C, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Vhc AV_CH_TOP_FRONT_CENTER }, { MOV_CH_LAYOUT_DTS_6_1_A, AV_CH_LAYOUT_6POINT1_FRONT }, // Lc, Rc, L, R, Ls, Rs, LFE { MOV_CH_LAYOUT_DTS_6_1_B, AV_CH_LAYOUT_5POINT1_BACK | // C, L, R, Rls, Rrs, Ts, LFE AV_CH_TOP_CENTER }, { MOV_CH_LAYOUT_DTS_6_1_C, AV_CH_LAYOUT_6POINT1_BACK }, // C, Cs, L, R, Rls, Rrs, LFE { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_8ch[] = { { MOV_CH_LAYOUT_OCTAGONAL, AV_CH_LAYOUT_OCTAGONAL }, // L, R, Rls, Rrs, C, Cs, Ls, Rs { MOV_CH_LAYOUT_AAC_OCTAGONAL, AV_CH_LAYOUT_OCTAGONAL }, // C, L, R, Ls, Rs, Rls, Rrs, Cs { MOV_CH_LAYOUT_CUBE, AV_CH_LAYOUT_CUBE }, // L, R, Rls, Rrs, Vhl, Vhr, Rlt, Rrt { MOV_CH_LAYOUT_MPEG_7_1_A, AV_CH_LAYOUT_7POINT1_WIDE }, // L, R, C, LFE, Ls, Rs, Lc, Rc { MOV_CH_LAYOUT_MPEG_7_1_B, AV_CH_LAYOUT_7POINT1_WIDE }, // C, Lc, Rc, L, R, Ls, Rs, LFE { MOV_CH_LAYOUT_EMAGIC_DEFAULT_7_1, AV_CH_LAYOUT_7POINT1_WIDE }, // L, R, Ls, Rs, C, LFE, Lc, Rc { MOV_CH_LAYOUT_EAC3_7_1_B, AV_CH_LAYOUT_7POINT1_WIDE }, // L, C, R, Ls, Rs, LFE, Lc, Rc { MOV_CH_LAYOUT_DTS_7_1, AV_CH_LAYOUT_7POINT1_WIDE }, // Lc, C, Rc, L, R, Ls, Rs, LFE { MOV_CH_LAYOUT_MPEG_7_1_C, AV_CH_LAYOUT_7POINT1 }, // L, R, C, LFE, Ls, Rs, Rls, Rrs { MOV_CH_LAYOUT_EAC3_7_1_A, AV_CH_LAYOUT_7POINT1 }, // L, C, R, Ls, Rs, LFE, Rls, Rrs { MOV_CH_LAYOUT_SMPTE_DTV, AV_CH_LAYOUT_5POINT1 | // L, R, C, LFE, Ls, Rs, Lt, Rt AV_CH_LAYOUT_STEREO_DOWNMIX }, { MOV_CH_LAYOUT_EAC3_7_1_C, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Lsd, Rsd AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT }, { MOV_CH_LAYOUT_EAC3_7_1_D, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Lw, Rw AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT }, { MOV_CH_LAYOUT_EAC3_7_1_E, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Vhl, Vhr AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT }, { MOV_CH_LAYOUT_EAC3_7_1_F, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Cs, Ts AV_CH_BACK_CENTER | AV_CH_TOP_CENTER }, { MOV_CH_LAYOUT_EAC3_7_1_G, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Cs, Vhc AV_CH_BACK_CENTER | AV_CH_TOP_FRONT_CENTER }, { MOV_CH_LAYOUT_EAC3_7_1_H, AV_CH_LAYOUT_5POINT1 | // L, C, R, Ls, Rs, LFE, Ts, Vhc AV_CH_TOP_CENTER | AV_CH_TOP_FRONT_CENTER }, { MOV_CH_LAYOUT_DTS_8_0_A, AV_CH_LAYOUT_2_2 | // Lc, Rc, L, R, Ls, Rs, Rls, Rrs AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT | AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER }, { MOV_CH_LAYOUT_DTS_8_0_B, AV_CH_LAYOUT_5POINT0 | // Lc, C, Rc, L, R, Ls, Cs, Rs AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_BACK_CENTER }, { 0, 0 }, }; static const struct MovChannelLayoutMap mov_ch_layout_map_9ch[] = { { MOV_CH_LAYOUT_DTS_8_1_A, AV_CH_LAYOUT_2_2 | // Lc, Rc, L, R, Ls, Rs, Rls, Rrs, LFE AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT | AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LOW_FREQUENCY }, { MOV_CH_LAYOUT_DTS_8_1_B, AV_CH_LAYOUT_7POINT1_WIDE | // Lc, C, Rc, L, R, Ls, Cs, Rs, LFE AV_CH_BACK_CENTER }, { 0, 0 }, }; static const struct MovChannelLayoutMap * const mov_ch_layout_map[] = { mov_ch_layout_map_misc, mov_ch_layout_map_1ch, mov_ch_layout_map_2ch, mov_ch_layout_map_3ch, mov_ch_layout_map_4ch, mov_ch_layout_map_5ch, mov_ch_layout_map_6ch, mov_ch_layout_map_7ch, mov_ch_layout_map_8ch, mov_ch_layout_map_9ch, }; 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 }, }; /** * Get the channel layout for the specified channel layout tag. * * @param[in] tag channel layout tag * @param[out] bitmap channel bitmap (only used if needed) * @return channel layout */ static uint64_t mov_get_channel_layout(uint32_t tag, uint32_t bitmap) { int i, channels; const struct MovChannelLayoutMap *layout_map; /* use ff_mov_get_channel_label() to build a layout instead */ if (tag == MOV_CH_LAYOUT_USE_DESCRIPTIONS) return 0; /* handle the use of the channel bitmap */ if (tag == MOV_CH_LAYOUT_USE_BITMAP) return bitmap < 0x40000 ? bitmap : 0; /* get the layout map based on the channel count for the specified layout tag */ channels = tag & 0xFFFF; if (channels > 9) channels = 0; layout_map = mov_ch_layout_map[channels]; /* find the channel layout for the specified layout tag */ for (i = 0; layout_map[i].tag != 0; i++) { if (layout_map[i].tag == tag) break; } return layout_map[i].layout; } static uint64_t mov_get_channel_mask(uint32_t label) { if (label == 0) return 0; if (label <= 18) return 1U << (label - 1); if (label == 35) return AV_CH_WIDE_LEFT; if (label == 36) return AV_CH_WIDE_RIGHT; if (label == 37) return AV_CH_LOW_FREQUENCY_2; if (label == 38) return AV_CH_STEREO_LEFT; if (label == 39) return AV_CH_STEREO_RIGHT; return 0; } 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; if (channels > 9) channels = 0; layout_map = mov_ch_layout_map[channels]; /* find the layout tag for the specified channel layout */ for (i = 0; layouts[i] != 0; i++) { if ((layouts[i] & 0xFFFF) != channels) continue; for (j = 0; layout_map[j].tag != 0; j++) { if (layout_map[j].tag == layouts[i] && (par->ch_layout.order == AV_CHANNEL_ORDER_NATIVE && layout_map[j].layout == par->ch_layout.u.mask)) break; } if (layout_map[j].tag) 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; uint64_t label_mask, mask = 0; int i; 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; label_mask = 0; for (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; if (layout_tag == 0) { uint64_t mask_incr = mov_get_channel_mask(label); if (mask_incr == 0) { label_mask = 0; break; } label_mask |= mask_incr; } } if (layout_tag == 0) { if (label_mask) mask = label_mask; } else mask = mov_get_channel_layout(layout_tag, bitmap); if (mask) { av_channel_layout_uninit(&st->codecpar->ch_layout); av_channel_layout_from_mask(&st->codecpar->ch_layout, mask); } avio_skip(pb, size - 12); return 0; }