Common encode/decode function to get reference frame

Replaced encoder and decoder functions to get a pointer
to a reference frame with a common function, vp9_get_ref_frame,
and simplified it.

Change-Id: Icb206fcce8caace3bfd1db3dbfa318dde79043ee

vp9/common/vp9_onyxc_int.h

@@ -202,6 +202,12 @@ typedef struct VP9Common {
   ENTROPY_CONTEXT *above_context;
 } VP9_COMMON;
 
+static INLINE YV12_BUFFER_CONFIG *get_ref_frame(VP9_COMMON *cm, int index) {
+  if (index < 0 || index >= REF_FRAMES)
+    return NULL;
+  return &cm->frame_bufs[cm->ref_frame_map[index]].buf;
+}
+
 static INLINE YV12_BUFFER_CONFIG *get_frame_new_buffer(VP9_COMMON *cm) {
   return &cm->frame_bufs[cm->new_fb_idx].buf;
 }

vp9/decoder/vp9_decoder.c

@@ -181,17 +181,6 @@ vpx_codec_err_t vp9_set_reference_dec(VP9_COMMON *cm,
   return cm->error.error_code;
 }
 
-
-int vp9_get_reference_dec(VP9Decoder *pbi, int index, YV12_BUFFER_CONFIG **fb) {
-  VP9_COMMON *cm = &pbi->common;
-
-  if (index < 0 || index >= REF_FRAMES)
-    return -1;
-
-  *fb = &cm->frame_bufs[cm->ref_frame_map[index]].buf;
-  return 0;
-}
-
 /* If any buffer updating is signaled it should be done here. */
 static void swap_frame_buffers(VP9Decoder *pbi) {
   int ref_index = 0, mask;

vp9/decoder/vp9_decoder.h

@@ -74,9 +74,6 @@ vpx_codec_err_t vp9_set_reference_dec(VP9_COMMON *cm,
                                       VP9_REFFRAME ref_frame_flag,
                                       YV12_BUFFER_CONFIG *sd);
 
-int vp9_get_reference_dec(struct VP9Decoder *pbi,
-                          int index, YV12_BUFFER_CONFIG **fb);
-
 struct VP9Decoder *vp9_decoder_create();
 
 void vp9_decoder_remove(struct VP9Decoder *pbi);

vp9/encoder/vp9_encoder.c

@@ -1303,16 +1303,6 @@ int vp9_copy_reference_enc(VP9_COMP *cpi, VP9_REFFRAME ref_frame_flag,
   }
 }
 
-int vp9_get_reference_enc(VP9_COMP *cpi, int index, YV12_BUFFER_CONFIG **fb) {
-  VP9_COMMON *cm = &cpi->common;
-
-  if (index < 0 || index >= REF_FRAMES)
-    return -1;
-
-  *fb = &cm->frame_bufs[cm->ref_frame_map[index]].buf;
-  return 0;
-}
-
 int vp9_set_reference_enc(VP9_COMP *cpi, VP9_REFFRAME ref_frame_flag,
                           YV12_BUFFER_CONFIG *sd) {
   YV12_BUFFER_CONFIG *cfg = get_vp9_ref_frame_buffer(cpi, ref_frame_flag);

vp9/encoder/vp9_encoder.h

@@ -463,9 +463,6 @@ void vp9_update_reference(VP9_COMP *cpi, int ref_frame_flags);
 int vp9_copy_reference_enc(VP9_COMP *cpi, VP9_REFFRAME ref_frame_flag,
                            YV12_BUFFER_CONFIG *sd);
 
-int vp9_get_reference_enc(VP9_COMP *cpi, int index,
-                          YV12_BUFFER_CONFIG **fb);
-
 int vp9_set_reference_enc(VP9_COMP *cpi, VP9_REFFRAME ref_frame_flag,
                           YV12_BUFFER_CONFIG *sd);
 

vp9/vp9_cx_iface.c

@@ -1053,9 +1053,9 @@ static vpx_codec_err_t ctrl_get_reference(vpx_codec_alg_priv_t *ctx,
   vp9_ref_frame_t *const frame = va_arg(args, vp9_ref_frame_t *);
 
   if (frame != NULL) {
-    YV12_BUFFER_CONFIG *fb;
+    YV12_BUFFER_CONFIG *fb = get_ref_frame(&ctx->cpi->common, frame->idx);
+    if (fb == NULL) return VPX_CODEC_ERROR;
 
-    vp9_get_reference_enc(ctx->cpi, frame->idx, &fb);
     yuvconfig2image(&frame->img, fb, NULL);
     return VPX_CODEC_OK;
   } else {

vp9/vp9_dx_iface.c

@@ -583,9 +583,9 @@ static vpx_codec_err_t ctrl_get_reference(vpx_codec_alg_priv_t *ctx,
   vp9_ref_frame_t *data = va_arg(args, vp9_ref_frame_t *);
 
   if (data) {
-    YV12_BUFFER_CONFIG* fb;
+    YV12_BUFFER_CONFIG* fb = get_ref_frame(&ctx->pbi->common, data->idx);
+    if (fb == NULL) return VPX_CODEC_ERROR;
 
-    vp9_get_reference_dec(ctx->pbi, data->idx, &fb);
     yuvconfig2image(&data->img, fb, NULL);
     return VPX_CODEC_OK;
   } else {