Add enumerations for compressed (E)AC3 sample format

media/base/sample_format.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_SAMPLE_FORMAT_H_
 #define MEDIA_BASE_SAMPLE_FORMAT_H_
 
 #include "media/base/media_export.h"
 
 namespace media {
 
 enum SampleFormat {
   // These values are histogrammed over time; do not change their ordinal
   // values.  When deleting a sample format replace it with a dummy value; when
   // adding a sample format, do so at the bottom before kSampleFormatMax, and
   // update the value of kSampleFormatMax.
   kUnknownSampleFormat = 0,
-  kSampleFormatU8,         // Unsigned 8-bit w/ bias of 128.
-  kSampleFormatS16,        // Signed 16-bit.
-  kSampleFormatS32,        // Signed 32-bit.
-  kSampleFormatF32,        // Float 32-bit.
-  kSampleFormatPlanarS16,  // Signed 16-bit planar.
-  kSampleFormatPlanarF32,  // Float 32-bit planar.
-  kSampleFormatPlanarS32,  // Signed 32-bit planar.
-  kSampleFormatS24,        // Signed 24-bit.
+  kSampleFormatU8,             // Unsigned 8-bit w/ bias of 128.
+  kSampleFormatS16,            // Signed 16-bit.
+  kSampleFormatS32,            // Signed 32-bit.
+  kSampleFormatF32,            // Float 32-bit.
+  kSampleFormatPlanarS16,      // Signed 16-bit planar.
+  kSampleFormatPlanarF32,      // Float 32-bit planar.
+  kSampleFormatPlanarS32,      // Signed 32-bit planar.
+  kSampleFormatS24,            // Signed 24-bit.
+  kSampleFormatBitstreamAc3,   // Compressed AC3 bitstream.

[DaleCurtis, 2016/11/17 00:02:15]

Just kSampleFormatAC3, ditto for EAC3?

[AndyWu, 2016/11/17 18:56:55]

Done.

+  kSampleFormatBitstreamEac3,  // Compressed E-AC3 bitstream.
 
   // Must always be equal to largest value ever logged.
-  kSampleFormatMax = kSampleFormatS24,
+  kSampleFormatMax = kSampleFormatBitstreamEac3,
 };
 
 // Returns the number of bytes used per channel for the specified
 // |sample_format|.
 MEDIA_EXPORT int SampleFormatToBytesPerChannel(SampleFormat sample_format);
 
 // Returns the name of the sample format as a string
 MEDIA_EXPORT const char* SampleFormatToString(SampleFormat sample_format);
 
 // Returns true if |sample_format| is planar, false otherwise.
 MEDIA_EXPORT bool IsPlanar(SampleFormat sample_format);
 
 // Returns true if |sample_format| is interleaved, false otherwise.
 MEDIA_EXPORT bool IsInterleaved(SampleFormat sample_format);
 
+// Returns true if |sample_format| is compressed bitstream, false otherwise.
+MEDIA_EXPORT bool IsCompressed(SampleFormat sample_format);
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_SAMPLE_FORMAT_H_