Function hcom_decode

libavcodec/hcom.c:84–127

}

static int hcom_decode(AVCodecContext *avctx, AVFrame *frame,
                       int *got_frame, AVPacket *pkt)
{
    HCOMContext *s = avctx->priv_data;
    GetBitContext gb;
    int ret, n = 0;

    if (pkt->size > INT16_MAX)
        return AVERROR_INVALIDDATA;

    frame->nb_samples = pkt->size * 8;
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;

    if ((ret = init_get_bits8(&gb, pkt->data, pkt->size)) < 0)
        return ret;

    while (get_bits_left(&gb) > 0) {
        if (get_bits1(&gb))
            s->dict_entry = s->dict[s->dict_entry].r;
        else
            s->dict_entry = s->dict[s->dict_entry].l;

        if (s->dict[s->dict_entry].l < 0) {
            int16_t datum;

            datum = s->dict[s->dict_entry].r;

            if (!s->delta_compression)
                s->sample = 0;
            s->sample = (s->sample + datum) & 0xFF;

            frame->data[0][n++] = s->sample;

            s->dict_entry = 0;
        }
    }

    frame->nb_samples = n;

    *got_frame = 1;

    return pkt->size;
}

static av_cold int hcom_close(AVCodecContext *avctx)
{