Adding new function ReadFrames() that returns the audio frame in planar

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 a07985c9fd8ca9fb4f3545f429ee851c5cdad363..3dacd38a9592986e6d7270b68c539dbfd746df35 100644
--- a/media/base/audio_buffer.h
+++ b/media/base/audio_buffer.h
@@ -73,6 +73,12 @@ class MEDIA_EXPORT AudioBuffer
                   int dest_frame_offset,
                   AudioBus* dest);
 
+  // Copy |frames_to_copy| frames into |dest|, |frames_to_copy| is the size of
+  // buffer pointed to by |dest| NOT the per channel number of frames. The
+  // frames are converted from their source format into interleaved int32.
+  // Note: |frames_to_copy| must be a multiple of channel_count.
+  void ReadFramesInterleavedS32(int frames_to_copy, int32* dest);
+
   // Trim an AudioBuffer by removing |frames_to_trim| frames from the start.
   // Timestamp and duration are adjusted to reflect the fewer frames.
   // Note that repeated calls to TrimStart() may result in timestamp() and