media/base/sample_format.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_BASE_SAMPLE_FORMAT_H
   6 #define MEDIA_BASE_SAMPLE_FORMAT_H
   7
   8 #include "media/base/media_export.h"
   9
  10 namespace media {
  11
  12 enum SampleFormat {
  13   // These values are histogrammed over time; do not change their ordinal
  14   // values.  When deleting a sample format replace it with a dummy value; when
  15   // adding a sample format, do so at the bottom before kSampleFormatMax, and
  16   // update the value of kSampleFormatMax.
  17   kUnknownSampleFormat = 0,
  18   kSampleFormatU8,         // Unsigned 8-bit w/ bias of 128.
  19   kSampleFormatS16,        // Signed 16-bit.
  20   kSampleFormatS32,        // Signed 32-bit.
  21   kSampleFormatF32,        // Float 32-bit.
  22   kSampleFormatPlanarS16,  // Signed 16-bit planar.
  23   kSampleFormatPlanarF32,  // Float 32-bit planar.
  24
  25   // Must always be equal to largest value ever logged.
  26   kSampleFormatMax = kSampleFormatPlanarF32,
  27 };
  28
  29 // Returns the number of bytes used per channel for the specified
  30 // |sample_format|.
  31 MEDIA_EXPORT int SampleFormatToBytesPerChannel(SampleFormat sample_format);
  32
  33 // Returns the name of the sample format as a string
  34 MEDIA_EXPORT const char* SampleFormatToString(SampleFormat sample_format);
  35
  36 }  // namespace media
  37
  38 #endif  // MEDIA_BASE_SAMPLE_FORMAT_H