Fix decoder to handle display size correctly

The decoder ignored the display width & height
specified in the frame header.

This patch adds a control, VP9D_GET_DISPLAY_SIZE, to
allow the application to obtain the display width and
height from the frame header.

vpxdec has been modified to scale the output frame to
this size.

Should the request for the display size fail vpxdec will
use the native width and height of the raw decoded
frame instead.

Change-Id: I25db04407426dac730263720c75a7dd6400af68a

diff --git a/vp9/vp9_dx_iface.c b/vp9/vp9_dx_iface.c
index 5dacab4..fde73e4 100644 (file)
--- a/vp9/vp9_dx_iface.c
+++ b/vp9/vp9_dx_iface.c
@@ -668,6 +668,25 @@ static vpx_codec_err_t get_frame_corrupted(vpx_codec_alg_priv_t *ctx,
   }
 }
 
+static vpx_codec_err_t get_display_size(vpx_codec_alg_priv_t *ctx,
+                                        int ctrl_id,
+                                        va_list args) {
+  int *const display_size = va_arg(args, int *);
+
+  if (display_size) {
+    const VP9D_COMP *const pbi = (VP9D_COMP *)ctx->pbi;
+    if (pbi) {
+      display_size[0] = pbi->common.display_width;
+      display_size[1] = pbi->common.display_height;
+    } else {
+      return VPX_CODEC_ERROR;
+    }
+    return VPX_CODEC_OK;
+  } else {
+    return VPX_CODEC_INVALID_PARAM;
+  }
+}
+
 static vpx_codec_err_t set_invert_tile_order(vpx_codec_alg_priv_t *ctx,
                                              int ctr_id,
                                              va_list args) {
@@ -686,6 +705,7 @@ static vpx_codec_ctrl_fn_map_t ctf_maps[] = {
   {VP8D_GET_LAST_REF_UPDATES,     get_last_ref_updates},
   {VP8D_GET_FRAME_CORRUPTED,      get_frame_corrupted},
   {VP9_GET_REFERENCE,             get_reference},
+  {VP9D_GET_DISPLAY_SIZE,         get_display_size},
   {VP9_INVERT_TILE_DECODE_ORDER,  set_invert_tile_order},
   { -1, NULL},
 };

diff --git a/vpx/vp8dx.h b/vpx/vp8dx.h
index d3093c4..b457b93 100644 (file)
--- a/vpx/vp8dx.h
+++ b/vpx/vp8dx.h
@@ -73,6 +73,9 @@ enum vp8_dec_control_id {
    */
   VP8D_SET_DECRYPTOR,
 
+  /** control function to get the display dimensions for the current frame. */
+  VP9D_GET_DISPLAY_SIZE,
+
   /** For testing. */
   VP9_INVERT_TILE_DECODE_ORDER,
 
@@ -105,6 +108,7 @@ VPX_CTRL_USE_TYPE(VP8D_GET_LAST_REF_UPDATES,   int *)
 VPX_CTRL_USE_TYPE(VP8D_GET_FRAME_CORRUPTED,    int *)
 VPX_CTRL_USE_TYPE(VP8D_GET_LAST_REF_USED,      int *)
 VPX_CTRL_USE_TYPE(VP8D_SET_DECRYPTOR,          vp8_decrypt_init *)
+VPX_CTRL_USE_TYPE(VP9D_GET_DISPLAY_SIZE,       int *)
 VPX_CTRL_USE_TYPE(VP9_INVERT_TILE_DECODE_ORDER, int)
 
 /*! @} - end defgroup vp8_decoder */

diff --git a/vpxdec.c b/vpxdec.c
index dc2eec8..051a461 100644 (file)
--- a/vpxdec.c
+++ b/vpxdec.c
@@ -426,7 +426,6 @@ int main_loop(int argc, const char **argv_) {
   int                     frames_corrupted = 0;
   int                     dec_flags = 0;
   int                     do_scale = 0;
-  int                     stream_w = 0, stream_h = 0;
   vpx_image_t             *scaled_img = NULL;
   int                     frame_avail, got_data;
 
@@ -771,9 +770,18 @@ int main_loop(int argc, const char **argv_) {
       }
 
       if (do_scale) {
+        int stream_w = 0, stream_h = 0;
         if (img && frame_out == 1) {
-          stream_w = img->d_w;
-          stream_h = img->d_h;
+          int display_size[2];
+          if (vpx_codec_control(&decoder, VP9D_GET_DISPLAY_SIZE,
+                                display_size)) {
+            // Fallback to use raw image size if display size not available.
+            stream_w = img->d_w;
+            stream_h = img->d_h;
+          } else {
+            stream_w = display_size[0];
+            stream_h = display_size[1];
+          }
           scaled_img = vpx_img_alloc(NULL, VPX_IMG_FMT_I420,
                                      stream_w, stream_h, 16);
         }
@@ -794,7 +802,6 @@ int main_loop(int argc, const char **argv_) {
           img = scaled_img;
         }
       }
-
       if (img) {
         unsigned int y;
         char out_fn[PATH_MAX];