media: Add support for playback of VP8 Alpha video streams

media/base/decoder_buffer.cc

Index: media/base/decoder_buffer.cc
diff --git a/media/base/decoder_buffer.cc b/media/base/decoder_buffer.cc
index 03f9bbbc566abc70abb878bc0dc00b34c82b7093..09e2011626e852f7a0290eb40daeeb8087f0841c 100644
--- a/media/base/decoder_buffer.cc
+++ b/media/base/decoder_buffer.cc
@@ -10,12 +10,14 @@
 namespace media {
 
 DecoderBuffer::DecoderBuffer(int size)
-    : size_(size) {
+    : size_(size),
+      side_data_size_(0) {
   Initialize();
 }
 
 DecoderBuffer::DecoderBuffer(const uint8* data, int size)
-    : size_(size) {
+    : size_(size),
+      side_data_size_(0) {
   if (!data) {
     CHECK_EQ(size_, 0);
     return;
@@ -32,6 +34,7 @@ void DecoderBuffer::Initialize() {
   data_.reset(reinterpret_cast<uint8*>(
       base::AlignedAlloc(size_ + kPaddingSize, kAlignmentSize)));
   memset(data_.get() + size_, 0, kPaddingSize);
+  side_data_size_ = 0;
 }
 
 // static
@@ -42,6 +45,16 @@ scoped_refptr<DecoderBuffer> DecoderBuffer::CopyFrom(const uint8* data,
   return make_scoped_refptr(new DecoderBuffer(data, data_size));
 }
 
+void DecoderBuffer::SetSideData(const uint8* side_data, int side_data_size) {
+  DCHECK(side_data);
+  DCHECK_GE(side_data_size_, 0);
+  side_data_size_ = side_data_size;
+  side_data_.reset(reinterpret_cast<uint8*>(
+      base::AlignedAlloc(side_data_size_ + kPaddingSize, kAlignmentSize)));
+  memset(side_data_.get() + side_data_size_, 0, kPaddingSize);
+  memcpy(side_data_.get(), side_data, side_data_size_);
+}
+
 // static
 scoped_refptr<DecoderBuffer> DecoderBuffer::CreateEOSBuffer() {
   return make_scoped_refptr(new DecoderBuffer(NULL, 0));
@@ -82,6 +95,14 @@ int DecoderBuffer::GetDataSize() const {
   return size_;
 }
 
+const uint8* DecoderBuffer::GetSideData() const {
+  return side_data_.get();

[scherkus (not reviewing), 2013/02/22 23:18:01]

add DCHECK(!IsEndOfStream());

[vignesh, 2013/02/25 21:51:42]

Done.

+}
+
+int DecoderBuffer::GetSideDataSize() const {
+  return side_data_size_;

[scherkus (not reviewing), 2013/02/22 23:18:01]

add DCHECK(!IsEndOfStream());

[vignesh, 2013/02/25 21:51:42]

Done.

+}
+
 const DecryptConfig* DecoderBuffer::GetDecryptConfig() const {
   DCHECK(!IsEndOfStream());
   return decrypt_config_.get();