static int wv_read_packet(AVFormatContext *s, AVPacket *pkt) { WVContext *wc = s->priv_data; int ret; int size, ver, off; if (url_feof(s->pb)) return AVERROR(EIO); if(wc->block_parsed){ if(wv_read_block_header(s, s->pb, 0) < 0) return -1; } off = wc->multichannel ? 4 : 0; if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0) return AVERROR(ENOMEM); if(wc->multichannel) AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12); memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE); ret = avio_read(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize); if(ret != wc->blksize){ av_free_packet(pkt); return AVERROR(EIO); } while(!(wc->flags & WV_END_BLOCK)){ if(avio_rl32(s->pb) != MKTAG('w', 'v', 'p', 'k')){ av_free_packet(pkt); return -1; } if((ret = av_append_packet(s->pb, pkt, 4)) < 0){ av_free_packet(pkt); return ret; } size = AV_RL32(pkt->data + pkt->size - 4); if(size < 24 || size > WV_BLOCK_LIMIT){ av_free_packet(pkt); av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size); return -1; } wc->blksize = size; ver = avio_rl16(s->pb); if(ver < 0x402 || ver > 0x410){ av_free_packet(pkt); av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver); return -1; } avio_r8(s->pb); // track no avio_r8(s->pb); // track sub index wc->samples = avio_rl32(s->pb); // total samples in file wc->soff = avio_rl32(s->pb); // offset in samples of current block if((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0){ av_free_packet(pkt); return ret; } memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE); if(wv_read_block_header(s, s->pb, 1) < 0){ av_free_packet(pkt); return -1; } ret = av_append_packet(s->pb, pkt, wc->blksize); if(ret < 0){ av_free_packet(pkt); return ret; } } pkt->stream_index = 0; wc->block_parsed = 1; pkt->pts = wc->soff; av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME); return 0; }
static int wv_read_packet(AVFormatContext *s, AVPacket *pkt) { WVContext *wc = s->priv_data; int ret; int size, ver, off; int64_t pos; uint32_t block_samples; if (s->pb->eof_reached) return AVERROR_EOF; if (wc->block_parsed) { if ((ret = wv_read_block_header(s, s->pb, 0)) < 0) return ret; } pos = wc->pos; off = wc->multichannel ? 4 : 0; if (av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0) return AVERROR(ENOMEM); if (wc->multichannel) AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12); memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE); ret = avio_read(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize); if (ret != wc->blksize) { av_free_packet(pkt); return AVERROR(EIO); } while (!(wc->flags & WV_END_BLOCK)) { if (avio_rl32(s->pb) != MKTAG('w', 'v', 'p', 'k')) { av_free_packet(pkt); return AVERROR_INVALIDDATA; } if ((ret = av_append_packet(s->pb, pkt, 4)) < 0) { av_free_packet(pkt); return ret; } size = AV_RL32(pkt->data + pkt->size - 4); if (size < 24 || size > WV_BLOCK_LIMIT) { av_free_packet(pkt); av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size); return AVERROR_INVALIDDATA; } wc->blksize = size; ver = avio_rl16(s->pb); if (ver < 0x402 || ver > 0x410) { av_free_packet(pkt); av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver); return AVERROR_PATCHWELCOME; } avio_r8(s->pb); // track no avio_r8(s->pb); // track sub index wc->samples = avio_rl32(s->pb); // total samples in file wc->soff = avio_rl32(s->pb); // offset in samples of current block if ((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0) { av_free_packet(pkt); return ret; } memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE); if ((ret = wv_read_block_header(s, s->pb, 1)) < 0) { av_free_packet(pkt); return ret; } ret = av_append_packet(s->pb, pkt, wc->blksize); if (ret < 0) { av_free_packet(pkt); return ret; } } pkt->stream_index = 0; wc->block_parsed = 1; pkt->pts = wc->soff; block_samples = AV_RN32(wc->extra); if (block_samples > INT32_MAX) av_log(s, AV_LOG_WARNING, "Too many samples in block: %"PRIu32"\n", block_samples); else pkt->duration = block_samples; av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME); return 0; }