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avformat/mov: parse ISO-14496-12 ChannelLayout
Only support chnl version 0 now. Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
Zhao Zhili
@@ -940,6 +940,88 @@ static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
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return 0;
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}
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static int mov_read_chnl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
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{
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int64_t end = av_sat_add64(avio_tell(pb), atom.size);
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int stream_structure;
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int version, flags;
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int ret = 0;
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AVStream *st;
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if (c->fc->nb_streams < 1)
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return 0;
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st = c->fc->streams[c->fc->nb_streams-1];
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version = avio_r8(pb);
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flags = avio_rb24(pb);
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if (version != 0 || flags != 0) {
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av_log(c->fc, AV_LOG_ERROR,
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"Unsupported 'chnl' box with version %d, flags: %#x",
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version, flags);
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return AVERROR_INVALIDDATA;
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}
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stream_structure = avio_r8(pb);
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// stream carries channels
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if (stream_structure & 1) {
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int layout = avio_r8(pb);
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av_log(c->fc, AV_LOG_TRACE, "'chnl' layout %d\n", layout);
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if (!layout) {
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uint8_t *positions = av_malloc(st->codecpar->ch_layout.nb_channels);
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if (!positions)
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return AVERROR(ENOMEM);
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for (int i = 0; i < st->codecpar->ch_layout.nb_channels; i++) {
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int speaker_pos = avio_r8(pb);
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av_log(c->fc, AV_LOG_TRACE, "speaker_position %d\n", speaker_pos);
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if (speaker_pos == 126) { // explicit position
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avpriv_request_sample(c->fc, "explicit position");
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av_freep(&positions);
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return AVERROR_PATCHWELCOME;
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} else {
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positions[i] = speaker_pos;
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}
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}
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ret = ff_mov_get_layout_from_channel_positions(positions,
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st->codecpar->ch_layout.nb_channels,
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&st->codecpar->ch_layout);
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av_freep(&positions);
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if (ret) {
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av_log(c->fc, AV_LOG_ERROR,
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"get channel layout from speaker positions failed, %s\n",
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av_err2str(ret));
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return ret;
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}
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} else {
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uint64_t omitted_channel_map = avio_rb64(pb);
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if (omitted_channel_map) {
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avpriv_request_sample(c->fc, "omitted_channel_map 0x%" PRIx64 " != 0",
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omitted_channel_map);
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return AVERROR_PATCHWELCOME;
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}
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ff_mov_get_channel_layout_from_config(layout, &st->codecpar->ch_layout);
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}
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}
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// stream carries objects
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if (stream_structure & 2) {
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int obj_count = avio_r8(pb);
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av_log(c->fc, AV_LOG_TRACE, "'chnl' with object_count %d\n", obj_count);
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}
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if (avio_tell(pb) != end) {
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av_log(c->fc, AV_LOG_WARNING, "skip %" PRId64 " bytes of unknown data inside chnl\n",
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end - avio_tell(pb));
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avio_seek(pb, end, SEEK_SET);
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}
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return ret;
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}
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static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
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{
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AVStream *st;
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@@ -7817,7 +7899,8 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
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{ MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
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{ MKTAG('w','f','e','x'), mov_read_wfex },
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{ MKTAG('c','m','o','v'), mov_read_cmov },
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{ MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */
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{ MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout from quicktime */
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{ MKTAG('c','h','n','l'), mov_read_chnl }, /* channel layout from ISO-14496-12 */
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{ MKTAG('d','v','c','1'), mov_read_dvc1 },
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{ MKTAG('s','g','p','d'), mov_read_sgpd },
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{ MKTAG('s','b','g','p'), mov_read_sbgp },
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@@ -551,3 +551,299 @@ int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st,
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return 0;
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}
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/* ISO/IEC 23001-8, 8.2 */
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static const AVChannelLayout iso_channel_configuration[] = {
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// 0: any setup
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{},
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// 1: centre front
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AV_CHANNEL_LAYOUT_MONO,
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// 2: left front, right front
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AV_CHANNEL_LAYOUT_STEREO,
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// 3: centre front, left front, right front
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AV_CHANNEL_LAYOUT_SURROUND,
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// 4: centre front, left front, right front, rear centre
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AV_CHANNEL_LAYOUT_4POINT0,
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// 5: centre front, left front, right front, left surround, right surround
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AV_CHANNEL_LAYOUT_5POINT0,
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// 6: 5 + LFE
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AV_CHANNEL_LAYOUT_5POINT1,
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// 7: centre front, left front centre, right front centre,
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// left front, right front, left surround, right surround, LFE
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AV_CHANNEL_LAYOUT_7POINT1_WIDE,
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// 8: channel1, channel2
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AV_CHANNEL_LAYOUT_STEREO_DOWNMIX,
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// 9: left front, right front, rear centre
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AV_CHANNEL_LAYOUT_2_1,
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// 10: left front, right front, left surround, right surround
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AV_CHANNEL_LAYOUT_2_2,
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// 11: centre front, left front, right front, left surround, right surround, rear centre, LFE
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AV_CHANNEL_LAYOUT_6POINT1,
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// 12: centre front, left front, right front
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// left surround, right surround
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// rear surround left, rear surround right
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// LFE
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AV_CHANNEL_LAYOUT_7POINT1,
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// 13:
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AV_CHANNEL_LAYOUT_22POINT2,
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// 14:
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AV_CHANNEL_LAYOUT_7POINT1_TOP_BACK,
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// TODO: 15 - 20
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};
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/* ISO/IEC 23001-8, table 8 */
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static const enum AVChannel iso_channel_position[] = {
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// 0: left front
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AV_CHAN_FRONT_LEFT,
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// 1: right front
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AV_CHAN_FRONT_RIGHT,
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// 2: centre front
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AV_CHAN_FRONT_CENTER,
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// 3: low frequence enhancement
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AV_CHAN_LOW_FREQUENCY,
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// 4: left surround
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// TODO
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AV_CHAN_NONE,
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// 5: right surround
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// TODO
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AV_CHAN_NONE,
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// 6: left front centre
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AV_CHAN_FRONT_LEFT_OF_CENTER,
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// 7: right front centre
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AV_CHAN_FRONT_RIGHT_OF_CENTER,
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// 8: rear surround left
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AV_CHAN_BACK_LEFT,
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// 9: rear surround right
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AV_CHAN_BACK_RIGHT,
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// 10: rear centre
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AV_CHAN_BACK_CENTER,
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// 11: left surround direct
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AV_CHAN_SURROUND_DIRECT_LEFT,
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// 12: right surround direct
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AV_CHAN_SURROUND_DIRECT_RIGHT,
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// 13: left side surround
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AV_CHAN_SIDE_LEFT,
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// 14: right side surround
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AV_CHAN_SIDE_RIGHT,
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// 15: left wide front
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AV_CHAN_WIDE_LEFT,
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// 16: right wide front
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AV_CHAN_WIDE_RIGHT,
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// 17: left front vertical height
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AV_CHAN_TOP_FRONT_LEFT,
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// 18: right front vertical height
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AV_CHAN_TOP_FRONT_RIGHT,
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// 19: centre front vertical height
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AV_CHAN_TOP_FRONT_CENTER,
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// 20: left surround vertical height rear
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AV_CHAN_TOP_BACK_LEFT,
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// 21: right surround vertical height rear
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AV_CHAN_TOP_BACK_RIGHT,
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// 22: centre vertical height rear
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AV_CHAN_TOP_BACK_CENTER,
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// 23: left vertical height side surround
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AV_CHAN_TOP_SIDE_LEFT,
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// 24: right vertical height side surround
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AV_CHAN_TOP_SIDE_RIGHT,
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// 25: top centre surround
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AV_CHAN_TOP_CENTER,
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// 26: low frequency enhancement 2
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AV_CHAN_LOW_FREQUENCY_2,
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// 27: left front vertical bottom
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AV_CHAN_BOTTOM_FRONT_LEFT,
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// 28: right front vertical bottom
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AV_CHAN_BOTTOM_FRONT_RIGHT,
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// 29: centre front vertical bottom
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AV_CHAN_BOTTOM_FRONT_CENTER,
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// 30: left vertical height surround
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// TODO
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AV_CHAN_NONE,
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// 31: right vertical height surround
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// TODO
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AV_CHAN_NONE,
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// 32, 33, 34, 35, reserved
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AV_CHAN_NONE,
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AV_CHAN_NONE,
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AV_CHAN_NONE,
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AV_CHAN_NONE,
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// 36: low frequency enhancement 3
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AV_CHAN_NONE,
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// 37: left edge of screen
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AV_CHAN_NONE,
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// 38: right edge of screen
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AV_CHAN_NONE,
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// 39: half-way between centre of screen and left edge of screen
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AV_CHAN_NONE,
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// 40: half-way between centre of screen and right edge of screen
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AV_CHAN_NONE,
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// 41: left back surround
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AV_CHAN_NONE,
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// 42: right back surround
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AV_CHAN_NONE,
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// 43 - 125: reserved
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// 126: explicit position
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// 127: unknown /undefined
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};
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int ff_mov_get_channel_config_from_layout(const AVChannelLayout *layout, int *config)
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{
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// Set default value which means any setup in 23001-8
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*config = 0;
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for (int i = 0; i < FF_ARRAY_ELEMS(iso_channel_configuration); i++) {
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if (!av_channel_layout_compare(layout, iso_channel_configuration + i)) {
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*config = i;
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break;
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}
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}
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return 0;
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}
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int ff_mov_get_channel_layout_from_config(int config, AVChannelLayout *layout)
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{
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if (config > 0 && config < FF_ARRAY_ELEMS(iso_channel_configuration)) {
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av_channel_layout_copy(layout, &iso_channel_configuration[config]);
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return 0;
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}
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return -1;
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}
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int ff_mov_get_channel_positions_from_layout(const AVChannelLayout *layout,
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uint8_t *position, int position_num)
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{
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enum AVChannel channel;
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if (position_num < layout->nb_channels)
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return AVERROR(EINVAL);
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for (int i = 0; i < layout->nb_channels; i++) {
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position[i] = 127;
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channel = av_channel_layout_channel_from_index(layout, i);
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if (channel == AV_CHAN_NONE)
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return AVERROR(EINVAL);
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for (int j = 0; j < FF_ARRAY_ELEMS(iso_channel_position); j++) {
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if (iso_channel_position[j] == channel) {
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position[i] = j;
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break;
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}
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}
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if (position[i] == 127)
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return AVERROR(EINVAL);
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}
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return 0;
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}
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int ff_mov_get_layout_from_channel_positions(const uint8_t *position, int position_num,
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AVChannelLayout *layout)
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{
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int ret;
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enum AVChannel channel;
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av_channel_layout_uninit(layout);
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if (position_num <= 63) {
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layout->order = AV_CHANNEL_ORDER_NATIVE;
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layout->nb_channels = position_num;
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for (int i = 0; i < position_num; i++) {
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if (position[i] >= FF_ARRAY_ELEMS(iso_channel_position)) {
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ret = AVERROR_PATCHWELCOME;
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goto error;
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}
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channel = iso_channel_position[position[i]];
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// unsupported layout
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if (channel == AV_CHAN_NONE) {
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ret = AVERROR_PATCHWELCOME;
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goto error;
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}
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layout->u.mask |= 1ULL << channel;
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}
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} else {
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layout->order = AV_CHANNEL_ORDER_CUSTOM;
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layout->nb_channels = position_num;
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layout->u.map = av_calloc(position_num, sizeof(*layout->u.map));
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if (!layout->u.map) {
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ret = AVERROR(ENOMEM);
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goto error;
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}
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for (int i = 0; i < position_num; i++) {
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if (position[i] >= FF_ARRAY_ELEMS(iso_channel_position)) {
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ret = AVERROR_PATCHWELCOME;
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goto error;
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}
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channel = iso_channel_position[position[i]];
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// unsupported layout
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if (channel == AV_CHAN_NONE) {
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ret = AVERROR_PATCHWELCOME;
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goto error;
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}
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layout->u.map[i].id = channel;
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}
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}
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return 0;
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error:
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av_channel_layout_uninit(layout);
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return ret;
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}
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@@ -163,4 +163,30 @@ int ff_mov_get_channel_layout_tag(const AVCodecParameters *par,
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int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st,
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int64_t size);
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/**
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* Get ISO/IEC 23001-8 ChannelConfiguration from AVChannelLayout.
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*
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*/
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int ff_mov_get_channel_config_from_layout(const AVChannelLayout *layout, int *config);
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/**
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* Get AVChannelLayout from ISO/IEC 23001-8 ChannelConfiguration.
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*
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* @return 0 for success, -1 for doesn't match, layout is untouched on failure
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*/
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int ff_mov_get_channel_layout_from_config(int config, AVChannelLayout *layout);
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/**
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* Get ISO/IEC 23001-8 OutputChannelPosition from AVChannelLayout.
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*/
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int ff_mov_get_channel_positions_from_layout(const AVChannelLayout *layout,
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uint8_t *position, int position_num);
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/**
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* Get AVChannelLayout from ISO/IEC 23001-8 OutputChannelPosition.
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*/
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int ff_mov_get_layout_from_channel_positions(const uint8_t *position, int position_num,
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AVChannelLayout *layout);
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#endif /* AVFORMAT_MOV_CHAN_H */
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