Function ff_mpv_alloc_dummy_frames

libavcodec/mpegvideo_dec.c:304–341

}

int ff_mpv_alloc_dummy_frames(MpegEncContext *s)
{
    AVCodecContext *avctx = s->avctx;
    int ret;

    av_assert1(!s->last_pic.ptr || s->last_pic.ptr->f->buf[0]);
    av_assert1(!s->next_pic.ptr || s->next_pic.ptr->f->buf[0]);
    if (!s->last_pic.ptr && s->pict_type != AV_PICTURE_TYPE_I) {
        if (s->pict_type == AV_PICTURE_TYPE_B && s->next_pic.ptr)
            av_log(avctx, AV_LOG_DEBUG,
                   "allocating dummy last picture for B frame\n");
        else if (s->codec_id != AV_CODEC_ID_H261 /* H.261 has no keyframes */ &&
                 (s->picture_structure == PICT_FRAME || s->first_field))
            av_log(avctx, AV_LOG_ERROR,
                   "warning: first frame is no keyframe\n");

        /* Allocate a dummy frame */
        ret = alloc_dummy_frame(s, &s->last_pic);
        if (ret < 0)
            return ret;

        if (!avctx->hwaccel) {
            int luma_val = s->codec_id == AV_CODEC_ID_FLV1 || s->codec_id == AV_CODEC_ID_H263 ? 16 : 0x80;
            color_frame(s->last_pic.ptr->f, luma_val);
        }
    }
    if (!s->next_pic.ptr && s->pict_type == AV_PICTURE_TYPE_B) {
        /* Allocate a dummy frame */
        ret = alloc_dummy_frame(s, &s->next_pic);
        if (ret < 0)
            return ret;
    }

    av_assert0(s->pict_type == AV_PICTURE_TYPE_I || (s->last_pic.ptr &&
                                                 s->last_pic.ptr->f->buf[0]));

    return 0;
}

/**
 * generic function called after decoding