utils: Use data buffers directly instead of an AVPicture

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavcodec/utils.c

@@ -337,7 +337,8 @@ static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
 
     switch (avctx->codec_type) {
     case AVMEDIA_TYPE_VIDEO: {
-        AVPicture picture;
+        uint8_t *data[4];
+        int linesize[4];
         int size[4] = { 0 };
         int w = frame->width;
         int h = frame->height;
@@ -352,27 +353,27 @@ static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
         do {
             // NOTE: do not align linesizes individually, this breaks e.g. assumptions
             // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
-            av_image_fill_linesizes(picture.linesize, avctx->pix_fmt, w);
+            av_image_fill_linesizes(linesize, avctx->pix_fmt, w);
             // increase alignment of w for next try (rhs gives the lowest bit set in w)
             w += w & ~(w - 1);
 
             unaligned = 0;
             for (i = 0; i < 4; i++)
-                unaligned |= picture.linesize[i] % pool->stride_align[i];
+                unaligned |= linesize[i] % pool->stride_align[i];
         } while (unaligned);
 
-        tmpsize = av_image_fill_pointers(picture.data, avctx->pix_fmt, h,
-                                         NULL, picture.linesize);
+        tmpsize = av_image_fill_pointers(data, avctx->pix_fmt, h,
+                                         NULL, linesize);
         if (tmpsize < 0)
             return -1;
 
-        for (i = 0; i < 3 && picture.data[i + 1]; i++)
-            size[i] = picture.data[i + 1] - picture.data[i];
-        size[i] = tmpsize - (picture.data[i] - picture.data[0]);
+        for (i = 0; i < 3 && data[i + 1]; i++)
+            size[i] = data[i + 1] - data[i];
+        size[i] = tmpsize - (data[i] - data[0]);
 
         for (i = 0; i < 4; i++) {
             av_buffer_pool_uninit(&pool->pools[i]);
-            pool->linesize[i] = picture.linesize[i];
+            pool->linesize[i] = linesize[i];
             if (size[i]) {
                 pool->pools[i] = av_buffer_pool_init(size[i] + 16, NULL);
                 if (!pool->pools[i]) {