int ff_mov_read_chan(AVFormatContext *s, AVStream *st, int64_t size) { AVIOContext *pb = s->pb; uint32_t layout_tag, bitmap, num_descr, label_mask; int i; if (size < 12) return AVERROR_INVALIDDATA; layout_tag = avio_rb32(pb); bitmap = avio_rb32(pb); num_descr = avio_rb32(pb); av_dlog(s, "chan: layout=%u bitmap=%u num_descr=%u\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; label = avio_rb32(pb); // mChannelLabel avio_rb32(pb); // mChannelFlags avio_rl32(pb); // mCoordinates[0] avio_rl32(pb); // mCoordinates[1] avio_rl32(pb); // mCoordinates[2] if (layout_tag == 0) { uint32_t mask_incr = mov_get_channel_label(label); if (mask_incr == 0) { label_mask = 0; break; } label_mask |= mask_incr; } } if (layout_tag == 0) st->codec->channel_layout = label_mask; else st->codec->channel_layout = ff_mov_get_channel_layout(layout_tag, bitmap); return 0; }