static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt) { CDXLDemuxContext *cdxl = s->priv_data; AVIOContext *pb = s->pb; uint32_t current_size, video_size, image_size; uint16_t audio_size, palette_size, width, height; int64_t pos; int ret; if (pb->eof_reached) return AVERROR_EOF; pos = avio_tell(pb); if (!cdxl->read_chunk && avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE) return AVERROR_EOF; if (cdxl->header[0] != 1) { av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n"); return AVERROR_INVALIDDATA; } current_size = AV_RB32(&cdxl->header[2]); width = AV_RB16(&cdxl->header[14]); height = AV_RB16(&cdxl->header[16]); palette_size = AV_RB16(&cdxl->header[20]); audio_size = AV_RB16(&cdxl->header[22]); image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8; video_size = palette_size + image_size; if (palette_size > 512) return AVERROR_INVALIDDATA; if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE) return AVERROR_INVALIDDATA; if (cdxl->read_chunk && audio_size) { if (cdxl->audio_stream_index == -1) { AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_tag = 0; st->codec->codec_id = CODEC_ID_PCM_S8; st->codec->channels = cdxl->header[1] & 0x10 ? 2 : 1; st->codec->sample_rate = cdxl->sample_rate; st->start_time = 0; cdxl->audio_stream_index = st->index; avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); } ret = av_get_packet(pb, pkt, audio_size); if (ret < 0) return ret; pkt->stream_index = cdxl->audio_stream_index; pkt->pos = pos; pkt->duration = audio_size; cdxl->read_chunk = 0; } else { if (cdxl->video_stream_index == -1) { AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_tag = 0; st->codec->codec_id = CODEC_ID_CDXL; st->codec->width = width; st->codec->height = height; st->start_time = 0; cdxl->video_stream_index = st->index; if (cdxl->framerate) avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num); else avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); } if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0) return AVERROR(ENOMEM); memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE); ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size); if (ret < 0) { av_free_packet(pkt); return ret; } pkt->stream_index = cdxl->video_stream_index; pkt->flags |= AV_PKT_FLAG_KEY; pkt->pos = pos; pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220; cdxl->read_chunk = audio_size; } if (!cdxl->read_chunk) avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE); return ret; }