Add VP9 decoder control to get frame size

Adds a control function that allows the caller to get
the size of the current frame.

Change-Id: Iddfdedc0f3aa9aa46119f87d294681c82f275c9f

test/decode_api_test.cc

@@ -80,6 +80,7 @@ void TestVp9Controls(vpx_codec_ctx_t *dec) {
     VP8D_GET_LAST_REF_UPDATES,
     VP8D_GET_FRAME_CORRUPTED,
     VP9D_GET_DISPLAY_SIZE,
+    VP9D_GET_FRAME_SIZE
   };
   int val[2];
 

vp9/vp9_dx_iface.c

@@ -923,6 +923,33 @@ static vpx_codec_err_t ctrl_get_frame_corrupted(vpx_codec_alg_priv_t *ctx,
   }
 }
 
+static vpx_codec_err_t ctrl_get_frame_size(vpx_codec_alg_priv_t *ctx,
+                                           va_list args) {
+  int *const frame_size = va_arg(args, int *);
+
+  // Only support this function in serial decode.
+  if (ctx->frame_parallel_decode) {
+    set_error_detail(ctx, "Not supported in frame parallel decode");
+    return VPX_CODEC_INCAPABLE;
+  }
+
+  if (frame_size) {
+    if (ctx->frame_workers) {
+      VP9Worker *const worker = ctx->frame_workers;
+      FrameWorkerData *const frame_worker_data =
+          (FrameWorkerData *)worker->data1;
+      const VP9_COMMON *const cm = &frame_worker_data->pbi->common;
+      frame_size[0] = cm->width;
+      frame_size[1] = cm->height;
+      return VPX_CODEC_OK;
+    } else {
+      return VPX_CODEC_ERROR;
+    }
+  } else {
+    return VPX_CODEC_INVALID_PARAM;
+  }
+}
+
 static vpx_codec_err_t ctrl_get_display_size(vpx_codec_alg_priv_t *ctx,
                                              va_list args) {
   int *const display_size = va_arg(args, int *);
@@ -1027,6 +1054,7 @@ static vpx_codec_ctrl_fn_map_t decoder_ctrl_maps[] = {
   {VP9_GET_REFERENCE,             ctrl_get_reference},
   {VP9D_GET_DISPLAY_SIZE,         ctrl_get_display_size},
   {VP9D_GET_BIT_DEPTH,            ctrl_get_bit_depth},
+  {VP9D_GET_FRAME_SIZE,           ctrl_get_frame_size},
 
   { -1, NULL},
 };

vpx/vp8dx.h

@@ -76,7 +76,14 @@ enum vp8_dec_control_id {
   VPXD_SET_DECRYPTOR,
   VP8D_SET_DECRYPTOR = VPXD_SET_DECRYPTOR,
 
-  /** control function to get the display dimensions for the current frame. */
+  /** control function to get the dimensions that the current frame is decoded
+   * at. This may be different to the intended display size for the frame as
+   * specified in the wrapper or frame header (see VP9D_GET_DISPLAY_SIZE). */
+  VP9D_GET_FRAME_SIZE,
+
+  /** control function to get the current frame's intended display dimensions
+   * (as specified in the wrapper or frame header). This may be different to
+   * the decoded dimensions of this frame (see VP9D_GET_FRAME_SIZE). */
   VP9D_GET_DISPLAY_SIZE,
 
   /** control function to get the bit depth of the stream. */
@@ -140,6 +147,7 @@ VPX_CTRL_USE_TYPE(VPXD_SET_DECRYPTOR,           vpx_decrypt_init *)
 VPX_CTRL_USE_TYPE(VP8D_SET_DECRYPTOR,           vpx_decrypt_init *)
 VPX_CTRL_USE_TYPE(VP9D_GET_DISPLAY_SIZE,        int *)
 VPX_CTRL_USE_TYPE(VP9D_GET_BIT_DEPTH,           unsigned int *)
+VPX_CTRL_USE_TYPE(VP9D_GET_FRAME_SIZE,          int *)
 VPX_CTRL_USE_TYPE(VP9_INVERT_TILE_DECODE_ORDER, int)
 
 /*! @} - end defgroup vp8_decoder */