Function decode_frame

libavcodec/ffv1dec.c:795–903

}

static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
                        int *got_frame, AVPacket *avpkt)
{
    FFV1Context *f      = avctx->priv_data;
    int ret;
    AVFrame *p;
    const FFHWAccel *hwaccel = NULL;

    /* This is copied onto the first slice's range coder context */
    RangeCoder c;

    ff_progress_frame_unref(&f->last_picture);
    av_refstruct_unref(&f->hwaccel_last_picture_private);

    FFSWAP(ProgressFrame, f->picture, f->last_picture);
    FFSWAP(void *, f->hwaccel_picture_private, f->hwaccel_last_picture_private);

    f->avctx = avctx;
    f->frame_damaged = 0;

    ret = decode_header(avctx, &c, avpkt->data, avpkt->size);
    if (ret < 0)
        return ret;

    if (avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
               f->version, !!f->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);

    if (avctx->skip_frame >= AVDISCARD_ALL)
        return avpkt->size;

    if (avctx->hwaccel)
        hwaccel = ffhwaccel(avctx->hwaccel);

    ret = ff_progress_frame_get_buffer(avctx, &f->picture,
                                       AV_GET_BUFFER_FLAG_REF);
    if (ret < 0)
        return ret;

    ret = ff_hwaccel_frame_priv_alloc(avctx, &f->hwaccel_picture_private);
    if (ret < 0)
        return ret;

    p = f->picture.f;

    p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P
    p->flags     = (p->flags & ~AV_FRAME_FLAG_KEY) | f->key_frame;

    if (f->version < 3 && avctx->field_order > AV_FIELD_PROGRESSIVE) {
        /* we have interlaced material flagged in container */
        p->flags |= AV_FRAME_FLAG_INTERLACED;
        if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
            p->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
    }

    /* Start */
    if (hwaccel) {
        ret = hwaccel->start_frame(avctx, avpkt->buf, avpkt->data, avpkt->size);