Function wavpack_decode_block

libavcodec/wavpack.c:1089–1612

}

static int wavpack_decode_block(AVCodecContext *avctx, AVFrame *frame, int block_no,
                                const uint8_t *buf, int buf_size, int *new_progress)
{
    WavpackContext *wc = avctx->priv_data;
    WavpackFrameContext *s;
    GetByteContext gb;
    enum AVSampleFormat sample_fmt;
    void *samples_l = NULL, *samples_r = NULL;
    int ret;
    int got_terms   = 0, got_weights = 0, got_samples = 0,
        got_entropy = 0, got_pcm     = 0, got_float   = 0, got_hybrid = 0;
    int got_dsd = 0;
    int i, j, id, size, ssize, weights, t;
    int bpp, chan = 0, orig_bpp, sample_rate = 0, rate_x = 1, dsd_mode = 0;
    int multiblock;
    uint64_t chmask = 0;

    if (block_no >= wc->fdec_num && wv_alloc_frame_context(wc) < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error creating frame decode context\n");
        return AVERROR_INVALIDDATA;
    }

    s = wc->fdec[block_no];

    memset(s->decorr, 0, MAX_TERMS * sizeof(Decorr));
    memset(s->ch, 0, sizeof(s->ch));
    s->extra_bits     = 0;
    s->and            = s->or = s->shift = 0;
    s->got_extra_bits = 0;

    bytestream2_init(&gb, buf, buf_size);

    s->samples = bytestream2_get_le32(&gb);
    if (s->samples != wc->samples) {
        av_log(avctx, AV_LOG_ERROR, "Mismatching number of samples in "
               "a sequence: %d and %d\n", wc->samples, s->samples);
        return AVERROR_INVALIDDATA;
    }
    s->frame_flags = bytestream2_get_le32(&gb);

    if (s->frame_flags & (WV_FLOAT_DATA | WV_DSD_DATA))
        sample_fmt = AV_SAMPLE_FMT_FLTP;
    else if ((s->frame_flags & 0x03) <= 1)
        sample_fmt = AV_SAMPLE_FMT_S16P;
    else
        sample_fmt = AV_SAMPLE_FMT_S32P;

    if (wc->ch_offset && avctx->sample_fmt != sample_fmt)
        return AVERROR_INVALIDDATA;

    bpp            = av_get_bytes_per_sample(sample_fmt);
    orig_bpp       = ((s->frame_flags & 0x03) + 1) << 3;
    multiblock     = (s->frame_flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK;

    s->stereo         = !(s->frame_flags & WV_MONO);
    s->stereo_in      =  (s->frame_flags & WV_FALSE_STEREO) ? 0 : s->stereo;
    s->joint          =   s->frame_flags & WV_JOINT_STEREO;
    s->hybrid         =   s->frame_flags & WV_HYBRID_MODE;