Misc. bit-depth related changes

Sets the bit-depth field as default 8 in the image structure in vp8.
Generalizes yuv read in preparation for support for reading 422/444
for 8-bit and 10/12-bit.

Change-Id: I560c13c348b122fd028e408431156376b895058c

tools_common.c

@@ -83,11 +83,12 @@ int read_yuv_frame(struct VpxInputContext *input_ctx, vpx_image_t *yuv_frame) {
   struct FileTypeDetectionBuffer *detect = &input_ctx->detect;
   int plane = 0;
   int shortread = 0;
+  const int bytespp = (input_ctx->fmt & VPX_IMG_FMT_HIGH) ? 2 : 1;
 
   for (plane = 0; plane < 3; ++plane) {
     uint8_t *ptr;
-    const int w = (plane ? (1 + yuv_frame->d_w) / 2 : yuv_frame->d_w);
-    const int h = (plane ? (1 + yuv_frame->d_h) / 2 : yuv_frame->d_h);
+    const int w = vpx_img_plane_width(yuv_frame, plane);
+    const int h = vpx_img_plane_height(yuv_frame, plane);
     int r;
 
     /* Determine the correct plane based on the image format. The for-loop
@@ -108,7 +109,7 @@ int read_yuv_frame(struct VpxInputContext *input_ctx, vpx_image_t *yuv_frame) {
     }
 
     for (r = 0; r < h; ++r) {
-      size_t needed = w;
+      size_t needed = w * bytespp;
       size_t buf_position = 0;
       const size_t left = detect->buf_read - detect->position;
       if (left > 0) {

vp8/vp8_dx_iface.c

@@ -269,6 +269,7 @@ static void yuvconfig2image(vpx_image_t               *img,
     img->stride[VPX_PLANE_U] = yv12->uv_stride;
     img->stride[VPX_PLANE_V] = yv12->uv_stride;
     img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
+    img->bit_depth = 8;
     img->bps = 12;
     img->user_priv = user_priv;
     img->img_data = yv12->buffer_alloc;

vpxdec.c

@@ -875,6 +875,7 @@ int main_loop(int argc, const char **argv_) {
           }
           scaled_img = vpx_img_alloc(NULL, VPX_IMG_FMT_I420, display_width,
                                      display_height, 16);
+          scaled_img->bit_depth = img->bit_depth;
         }
 
         if (img->d_w != scaled_img->d_w || img->d_h != scaled_img->d_h) {
@@ -901,7 +902,7 @@ int main_loop(int argc, const char **argv_) {
                                         vpx_input_ctx.width,
                                         vpx_input_ctx.height,
                                         &vpx_input_ctx.framerate,
-                                        img->fmt, 8);
+                                        img->fmt, img->bit_depth);
             if (do_md5) {
               MD5Update(&md5_ctx, (md5byte *)buf, (unsigned int)len);
             } else {