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_shmem_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.
  kSampleFormatAc3,         // Compressed AC3 bitstream.
  kSampleFormatEac3,        // Compressed E-AC3 bitstream.
  kSampleFormatMpegHAudio,  // Compressed MPEG-H audio bitstream.

  // Must always be equal to largest value ever logged.
  kSampleFormatMax = kSampleFormatMpegHAudio,
};

// Returns the number of bytes used per channel for the specified
// |sample_format|.
MEDIA_SHMEM_EXPORT int SampleFormatToBytesPerChannel(
    SampleFormat sample_format);
MEDIA_SHMEM_EXPORT int SampleFormatToBitsPerChannel(SampleFormat sample_format);

// Returns the name of the sample format as a string
MEDIA_SHMEM_EXPORT const char* SampleFormatToString(SampleFormat sample_format);

// Returns true if |sample_format| is planar, false otherwise.
MEDIA_SHMEM_EXPORT bool IsPlanar(SampleFormat sample_format);

// Returns true if |sample_format| is interleaved, false otherwise.
MEDIA_SHMEM_EXPORT bool IsInterleaved(SampleFormat sample_format);

// Returns true if |sample_format| is compressed bitstream, false otherwise.
MEDIA_SHMEM_EXPORT bool IsBitstream(SampleFormat sample_format);

}  // namespace media

#endif  // MEDIA_BASE_SAMPLE_FORMAT_H_