Use passthrough decoder for (E)AC3 formats

media/base/audio_buffer.h

Index: media/base/audio_buffer.h
diff --git a/media/base/audio_buffer.h b/media/base/audio_buffer.h
index d03a02ed4fcfa1ea7ffd2bbae91e0c669a37cb2a..530f86b578f7a8450fecbfc680d82f21c81bb84e 100644
--- a/media/base/audio_buffer.h
+++ b/media/base/audio_buffer.h
@@ -57,6 +57,19 @@ class MEDIA_EXPORT AudioBuffer
                                              const uint8_t* const* data,
                                              const base::TimeDelta timestamp);
 
+  // Create an AudioBuffer for compressed bitstream. Its channel data is copied
+  // from |data|, and the size is |data_size|. |data| must not be null and
+  // |frame_count| must be >= 0.
+  static scoped_refptr<AudioBuffer> CopyBitstreamFrom(
+      SampleFormat sample_format,
+      ChannelLayout channel_layout,
+      int channel_count,
+      int sample_rate,
+      int frame_count,
+      const uint8_t* const* data,
+      const size_t data_size,
+      const base::TimeDelta timestamp);
+
   // Create an AudioBuffer with |frame_count| frames. Buffer is allocated, but
   // not initialized. Timestamp and duration are set to kNoTimestamp.
   static scoped_refptr<AudioBuffer> CreateBuffer(SampleFormat sample_format,
@@ -65,6 +78,16 @@ class MEDIA_EXPORT AudioBuffer
                                                  int sample_rate,
                                                  int frame_count);
 
+  // Create an AudioBuffer for compressed bitstream. Buffer is allocated, but
+  // not initialized. Timestamp and duration are set to kNoTimestamp.
+  static scoped_refptr<AudioBuffer> CreateBitstreamBuffer(
+      SampleFormat sample_format,
+      ChannelLayout channel_layout,
+      int channel_count,
+      int sample_rate,
+      int frame_count,
+      size_t data_size);
+
   // Create an empty AudioBuffer with |frame_count| frames.
   static scoped_refptr<AudioBuffer> CreateEmptyBuffer(
       ChannelLayout channel_layout,
@@ -117,6 +140,9 @@ class MEDIA_EXPORT AudioBuffer
   // Return the sample rate.
   int sample_rate() const { return sample_rate_; }
 
+  // Return the sample format.
+  SampleFormat sample_format() const { return sample_format_; }
+
   // Return the channel layout.
   ChannelLayout channel_layout() const { return channel_layout_; }
 
@@ -157,6 +183,7 @@ class MEDIA_EXPORT AudioBuffer
               int frame_count,
               bool create_buffer,
               const uint8_t* const* data,
+              size_t data_size,
               const base::TimeDelta timestamp);
 
   virtual ~AudioBuffer();