avformat/mov_chan: add support for omitted_channel bitmask in chnl atom
Signed-off-by: Marton Balint <cus@passwd.hu>
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c38f785be4
@ -370,25 +370,33 @@ static const struct MovChannelLayoutMap* find_layout_map(uint32_t tag, const str
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* @param[in] tag channel layout tag
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* @return <0 on error
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*/
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static int mov_get_channel_layout(AVChannelLayout *ch_layout, uint32_t tag, const struct MovChannelLayoutMap *map)
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static int mov_get_channel_layout(AVChannelLayout *ch_layout, uint32_t tag, uint64_t omitted_channel_map, const struct MovChannelLayoutMap *map)
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{
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int i, channels;
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const struct MovChannelLayoutMap *layout_map;
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channels = tag & 0xFFFF;
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/* find the channel layout for the specified layout tag */
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layout_map = find_layout_map(tag, map);
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if (layout_map) {
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int ret;
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int map_layout_nb_channels = tag & 0xFFFF;
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int nb_channels = ch_layout->nb_channels;
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/* Omitted channel bits must not exceed number of channels in map */
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if (omitted_channel_map >> map_layout_nb_channels)
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return AVERROR_INVALIDDATA;
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av_channel_layout_uninit(ch_layout);
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ret = av_channel_layout_custom_init(ch_layout, channels);
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ret = av_channel_layout_custom_init(ch_layout, nb_channels);
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if (ret < 0)
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return ret;
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for (i = 0; i < channels; i++) {
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enum AVChannel id = layout_map[i].id;
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ch_layout->u.map[i].id = (id != AV_CHAN_NONE ? id : AV_CHAN_UNKNOWN);
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for (int i = 0, idx = 0; i < map_layout_nb_channels && idx < nb_channels; i++, omitted_channel_map >>= 1) {
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if (!(omitted_channel_map & 1)) {
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enum AVChannel id = layout_map[i].id;
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ch_layout->u.map[idx++].id = (id != AV_CHAN_NONE ? id : AV_CHAN_UNKNOWN);
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}
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}
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return av_channel_layout_retype(ch_layout, 0, AV_CHANNEL_LAYOUT_RETYPE_FLAG_CANONICAL);
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}
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return 0;
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@ -583,7 +591,7 @@ int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st,
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if (!ch_layout->nb_channels)
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ch_layout->nb_channels = nb_channels;
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if (nb_channels == ch_layout->nb_channels) {
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ret = mov_get_channel_layout(ch_layout, layout_tag, mov_ch_layout_map);
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ret = mov_get_channel_layout(ch_layout, layout_tag, 0, mov_ch_layout_map);
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if (ret < 0)
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return ret;
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} else {
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@ -744,16 +752,17 @@ int ff_mov_get_channel_config_from_layout(const AVChannelLayout *layout, int *co
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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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int ff_mov_get_channel_layout_from_config(int config, AVChannelLayout *layout, uint64_t omitted_channel_map)
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{
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if (config > 0) {
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uint32_t layout_tag;
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int nb_omitted_channels = av_popcount64(omitted_channel_map);
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if (layout->nb_channels <= 0 || layout->nb_channels > UINT16_MAX)
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if (layout->nb_channels <= 0 || layout->nb_channels > UINT16_MAX - nb_omitted_channels)
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return AVERROR_INVALIDDATA;
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layout_tag = (config << 16) | layout->nb_channels;
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return mov_get_channel_layout(layout, layout_tag, iso_ch_layout_map);
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layout_tag = (config << 16) | (layout->nb_channels + nb_omitted_channels);
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return mov_get_channel_layout(layout, layout_tag, omitted_channel_map, iso_ch_layout_map);
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}
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return 1;
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}
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@ -829,13 +838,7 @@ int ff_mov_read_chnl(AVFormatContext *s, AVIOContext *pb, AVStream *st)
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return ret;
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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(s, "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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ret = ff_mov_get_channel_layout_from_config(layout, &st->codecpar->ch_layout);
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ret = ff_mov_get_channel_layout_from_config(layout, &st->codecpar->ch_layout, omitted_channel_map);
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if (ret < 0)
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return ret;
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}
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@ -176,7 +176,7 @@ int ff_mov_get_channel_config_from_layout(const AVChannelLayout *layout, int *co
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* 0 if the config was found
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* <0 on error
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*/
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int ff_mov_get_channel_layout_from_config(int config, AVChannelLayout *layout);
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int ff_mov_get_channel_layout_from_config(int config, AVChannelLayout *layout, uint64_t omitted_channel_map);
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/**
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* Get ISO/IEC 23001-8 OutputChannelPosition from AVChannelLayout.
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