Fake video decoder in clearkey CDM.

webkit/media/crypto/ppapi/clear_key_cdm.cc

Index: webkit/media/crypto/ppapi/clear_key_cdm.cc
diff --git a/webkit/media/crypto/ppapi/clear_key_cdm.cc b/webkit/media/crypto/ppapi/clear_key_cdm.cc
index 406a93497b4e40edafd9e934a55bef622ce22a13..6e6c96c476071d7da1185f7bf770b1fbb7a54eaf 100644
--- a/webkit/media/crypto/ppapi/clear_key_cdm.cc
+++ b/webkit/media/crypto/ppapi/clear_key_cdm.cc
@@ -236,8 +236,13 @@ cdm::Status ClearKeyCdm::Decrypt(
 
 cdm::Status ClearKeyCdm::InitializeVideoDecoder(
     const cdm::VideoDecoderConfig& video_decoder_config) {
+#if !defined(CLEAR_KEY_CDM_USE_FAKE_DECODER)
+  NOTIMPLEMENTED();
+  return cdm::kSessionError;
+#else
   video_size_ = video_decoder_config.coded_size;
   return cdm::kSuccess;
+#endif
 }
 
 void ClearKeyCdm::ResetDecoder(cdm::StreamType) {
@@ -271,25 +276,37 @@ cdm::Status ClearKeyCdm::DecryptAndDecodeFrame(
   if (status == media::Decryptor::kNoKey)
     return cdm::kNoKey;
 
+#if !defined(CLEAR_KEY_CDM_USE_FAKE_DECODER)
+  NOTIMPLEMENTED();
+  return cdm::kDecodeError;
+#else
   GenerateFakeVideoFrame(decoder_buffer->GetTimestamp(), video_frame);
   return cdm::kSuccess;
+#endif
 }
 
+#if defined(CLEAR_KEY_CDM_USE_FAKE_DECODER)
 void ClearKeyCdm::GenerateFakeVideoFrame(base::TimeDelta timestamp,
                                          cdm::VideoFrame* video_frame) {
+  // Choose non-zero alignment and padding on purpose for testing.
+  const int kAlignment = 8;
+  const int kPadding = 16;
+  const int kPlanePadding = 128;
+
   int width = video_size_.width;
   int height = video_size_.height;
-  int alignment = 8;
-  int padding = 16;
-  int y_stride = (width + alignment - 1) / alignment * alignment + padding;
-  int uv_stride = (width / 2 + alignment - 1) / alignment * alignment + padding;
+  DCHECK(width % 2 == 0);
+  DCHECK(height % 2 == 0);
+
+  int y_stride = (width + kAlignment - 1) / kAlignment * kAlignment + kPadding;
+  int uv_stride =
+      (width / 2 + kAlignment - 1) / kAlignment * kAlignment + kPadding;
   int y_rows = height;
   int uv_rows = height / 2;
-  int plane_padding = 128;
   int y_offset = 0;
-  int v_offset = y_stride * y_rows + plane_padding;
-  int u_offset = v_offset + uv_stride * uv_rows + plane_padding;
-  int frame_size = u_offset + uv_stride * uv_rows + plane_padding;
+  int v_offset = y_stride * y_rows + kPlanePadding;
+  int u_offset = v_offset + uv_stride * uv_rows + kPlanePadding;
+  int frame_size = u_offset + uv_stride * uv_rows + kPlanePadding;
 
   video_frame->set_format(cdm::kYv12);
   video_frame->set_size(video_size_);
@@ -308,5 +325,6 @@ void ClearKeyCdm::GenerateFakeVideoFrame(base::TimeDelta timestamp,
   memset(reinterpret_cast<void*>(video_frame->frame_buffer()->data()),
          color, frame_size);
 }
+#endif  // CLEAR_KEY_CDM_USE_FAKE_DECODER
 
 }  // namespace webkit_media