+/**
+ * Releases a frame buffer
+ */
+static void free_frame_buffer(MpegEncContext *s, Picture *pic)
+{
+ s->avctx->release_buffer(s->avctx, (AVFrame*)pic);
+ av_freep(&pic->hwaccel_picture_private);
+}
+
+/**
+ * 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;
+}
+