Function alloc_frame_buffer

libavcodec/mpegvideo.c:213–249

* Allocates a frame buffer */

 * Allocates a frame buffer
 */
static int alloc_frame_buffer(MpegEncContext *s, Picture *pic)
{
    int r;

    if (s->avctx->hwaccel) {
        assert(!pic->hwaccel_picture_private);
        if (s->avctx->hwaccel->priv_data_size) {
            pic->hwaccel_picture_private = av_mallocz(s->avctx->hwaccel->priv_data_size);
            if (!pic->hwaccel_picture_private) {
                av_log(s->avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
                return -1;
            }
        }
    }

    r = s->avctx->get_buffer(s->avctx, (AVFrame*)pic);

    if (r<0 || !pic->age || !pic->type || !pic->data[0]) {
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed (%d %d %d %p)\n", r, pic->age, pic->type, pic->data[0]);
        av_freep(&pic->hwaccel_picture_private);
        return -1;
    }

    if (s->linesize && (s->linesize != pic->linesize[0] || s->uvlinesize != pic->linesize[1])) {
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed (stride changed)\n");
        free_frame_buffer(s, pic);
        return -1;
    }

    if (pic->linesize[1] != pic->linesize[2]) {
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed (uv stride mismatch)\n");
        free_frame_buffer(s, pic);
        return -1;
    }

    return 0;
}

/**
 * allocates a Picture