static int mov_write_avcc_tag(ByteIOContext *pb, MOVTrack *track) { offset_t pos = url_ftell(pb); put_be32(pb, 0); put_tag(pb, "avcC"); if (track->vosLen > 6) { /* check for h264 start code */ if (AV_RB32(track->vosData) == 0x00000001) { uint8_t *buf, *end; uint32_t sps_size=0, pps_size=0; uint8_t *sps=0, *pps=0; avc_parse_nal_units(&track->vosData, &track->vosLen); buf = track->vosData; end = track->vosData + track->vosLen; /* look for sps and pps */ while (buf < end) { unsigned int size; uint8_t nal_type; size = AV_RB32(buf); nal_type = buf[4] & 0x1f; if (nal_type == 7) { /* SPS */ sps = buf + 4; sps_size = size; } else if (nal_type == 8) { /* PPS */ pps = buf + 4; pps_size = size; } buf += size + 4; } assert(sps); assert(pps); put_byte(pb, 1); /* version */ put_byte(pb, sps[1]); /* profile */ put_byte(pb, sps[2]); /* profile compat */ put_byte(pb, sps[3]); /* level */ put_byte(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */ put_byte(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */ put_be16(pb, sps_size); put_buffer(pb, sps, sps_size); put_byte(pb, 1); /* number of pps */ put_be16(pb, pps_size); put_buffer(pb, pps, pps_size); } else { put_buffer(pb, track->vosData, track->vosLen); } } return updateSize(pb, pos); }