lavc: Add an internal wrapper around get_format()

It will be useful in the following commits.

libavcodec/8bps.c

@@ -159,7 +159,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
         c->planemap[0] = 0; // 1st plane is palette indexes
         break;
     case 24:
-        avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
+        avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24);
         c->planes      = 3;
         c->planemap[0] = 2; // 1st plane is red
         c->planemap[1] = 1; // 2nd plane is green

libavcodec/h263dec.c

@@ -57,7 +57,7 @@ av_cold int ff_h263_decode_init(AVCodecContext *avctx)
     if (avctx->codec->id == AV_CODEC_ID_MSS2)
         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
     else
-        avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
+        avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
     s->unrestricted_mv = 1;
 
     /* select sub codec */

libavcodec/h264_slice.c

@@ -1008,11 +1008,11 @@ static enum AVPixelFormat get_pixel_format(H264Context *h)
             return h->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ422P
                                                              : AV_PIX_FMT_YUV422P;
         } else {
-            return h->avctx->get_format(h->avctx, h->avctx->codec->pix_fmts ?
-                                        h->avctx->codec->pix_fmts :
-                                        h->avctx->color_range == AVCOL_RANGE_JPEG ?
-                                        h264_hwaccel_pixfmt_list_jpeg_420 :
-                                        h264_hwaccel_pixfmt_list_420);
+            return ff_get_format(h->avctx, h->avctx->codec->pix_fmts ?
+                                 h->avctx->codec->pix_fmts :
+                                 h->avctx->color_range == AVCOL_RANGE_JPEG ?
+                                 h264_hwaccel_pixfmt_list_jpeg_420 :
+                                 h264_hwaccel_pixfmt_list_420);
         }
         break;
     default:

libavcodec/internal.h

@@ -186,6 +186,13 @@ int ff_set_dimensions(AVCodecContext *s, int width, int height);
 int ff_side_data_update_matrix_encoding(AVFrame *frame,
                                         enum AVMatrixEncoding matrix_encoding);
 
+/**
+ * Select the (possibly hardware accelerated) pixel format.
+ * This is a wrapper around AVCodecContext.get_format() and should be used
+ * instead of calling get_format() directly.
+ */
+int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
+
 /**
  * Set various frame properties from the codec context / packet data.
  */

libavcodec/mpeg12dec.c

@@ -1188,12 +1188,12 @@ static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
 #if FF_API_XVMC
 FF_DISABLE_DEPRECATION_WARNINGS
     if (avctx->xvmc_acceleration)
-        return avctx->get_format(avctx, pixfmt_xvmc_mpg2_420);
+        return ff_get_format(avctx, pixfmt_xvmc_mpg2_420);
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif /* FF_API_XVMC */
 
     if (s->chroma_format < 2)
-        return avctx->get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
+        return ff_get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
     else if (s->chroma_format == 2)
         return AV_PIX_FMT_YUV422P;
     else

libavcodec/utils.c

@@ -864,6 +864,11 @@ enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const en
     return fmt[0];
 }
 
+int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
+{
+    return avctx->get_format(avctx, fmt);
+}
+
 #if FF_API_AVFRAME_LAVC
 void avcodec_get_frame_defaults(AVFrame *frame)
 {

libavcodec/vc1dec.c

@@ -5595,7 +5595,7 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
     if (!avctx->extradata_size || !avctx->extradata)
         return -1;
     if (!(avctx->flags & CODEC_FLAG_GRAY))
-        avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
+        avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
     else
         avctx->pix_fmt = AV_PIX_FMT_GRAY8;
     avctx->hwaccel = ff_find_hwaccel(avctx);