static int wsvqa_read_packet(AVFormatContext *s, AVPacket *pkt) { WsVqaDemuxContext *wsvqa = s->priv_data; AVIOContext *pb = s->pb; int ret = -1; unsigned char preamble[VQA_PREAMBLE_SIZE]; unsigned int chunk_type; unsigned int chunk_size; int skip_byte; while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) { chunk_type = AV_RB32(&preamble[0]); chunk_size = AV_RB32(&preamble[4]); skip_byte = chunk_size & 0x01; if ((chunk_type == SND0_TAG) || (chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) { ret= av_get_packet(pb, pkt, chunk_size); if (ret<0) return AVERROR(EIO); switch (chunk_type) { case SND0_TAG: case SND1_TAG: case SND2_TAG: if (wsvqa->audio_stream_index == -1) { AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); wsvqa->audio_stream_index = st->index; if (!wsvqa->sample_rate) wsvqa->sample_rate = 22050; if (!wsvqa->channels) wsvqa->channels = 1; if (!wsvqa->bps) wsvqa->bps = 8; st->codec->sample_rate = wsvqa->sample_rate; st->codec->bits_per_coded_sample = wsvqa->bps; st->codec->channels = wsvqa->channels; st->codec->codec_type = AVMEDIA_TYPE_AUDIO; avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); switch (chunk_type) { case SND0_TAG: if (wsvqa->bps == 16) st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; else st->codec->codec_id = AV_CODEC_ID_PCM_U8; break; case SND1_TAG: st->codec->codec_id = AV_CODEC_ID_WESTWOOD_SND1; break; case SND2_TAG: st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; st->codec->extradata_size = 2; st->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) return AVERROR(ENOMEM); AV_WL16(st->codec->extradata, wsvqa->version); break; } } pkt->stream_index = wsvqa->audio_stream_index; switch (chunk_type) { case SND1_TAG: /* unpacked size is stored in header */ pkt->duration = AV_RL16(pkt->data) / wsvqa->channels; break; case SND2_TAG: /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */ pkt->duration = (chunk_size * 2) / wsvqa->channels; break; } break; case VQFR_TAG: pkt->stream_index = wsvqa->video_stream_index; pkt->duration = 1; break; } /* stay on 16-bit alignment */ if (skip_byte) avio_skip(pb, 1); return ret; } else { switch(chunk_type){ case CMDS_TAG: break; default: av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type); } avio_skip(pb, chunk_size + skip_byte); } } return ret; }