示例#1
0
文件: wv.c 项目: eugenehp/ffmbc
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;
}
示例#2
0
文件: wv.c 项目: DonDiego/libav
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;
}