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media / base / sample_format.cc [blame]

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/base/sample_format.h"

#include <ostream>

#include "base/notreached.h"

namespace media {

int SampleFormatToBytesPerChannel(SampleFormat sample_format) {
  switch (sample_format) {
    case kUnknownSampleFormat:
      return 0;
    case kSampleFormatU8:
    case kSampleFormatPlanarU8:
    case kSampleFormatAc3:
    case kSampleFormatEac3:
    case kSampleFormatMpegHAudio:
    case kSampleFormatDts:
    case kSampleFormatDtsxP2:
    case kSampleFormatDtse:
      return 1;
    case kSampleFormatS16:
    case kSampleFormatPlanarS16:
      return 2;
    case kSampleFormatS24:
    case kSampleFormatS32:
    case kSampleFormatF32:
    case kSampleFormatPlanarF32:
    case kSampleFormatPlanarS32:
    case kSampleFormatIECDts:
      return 4;
  }

  NOTREACHED() << "Invalid sample format provided: " << sample_format;
}

int SampleFormatToBitsPerChannel(SampleFormat sample_format) {
  return SampleFormatToBytesPerChannel(sample_format) * 8;
}

const char* SampleFormatToString(SampleFormat sample_format) {
  switch(sample_format) {
    case kUnknownSampleFormat:
      return "Unknown sample format";
    case kSampleFormatU8:
      return "Unsigned 8-bit with bias of 128";
    case kSampleFormatS16:
      return "Signed 16-bit";
    case kSampleFormatS24:
      return "Signed 24-bit";
    case kSampleFormatS32:
      return "Signed 32-bit";
    case kSampleFormatF32:
      return "Float 32-bit";
    case kSampleFormatPlanarU8:
      return "Unsigned 8-bit with bias of 128 planar";
    case kSampleFormatPlanarS16:
      return "Signed 16-bit planar";
    case kSampleFormatPlanarF32:
      return "Float 32-bit planar";
    case kSampleFormatPlanarS32:
      return "Signed 32-bit planar";
    case kSampleFormatAc3:
      return "Compressed AC3 bitstream";
    case kSampleFormatEac3:
      return "Compressed E-AC3 bitstream";
    case kSampleFormatMpegHAudio:
      return "Compressed MPEG-H audio bitstream";
    case kSampleFormatDts:
      return "Compressed DTS bitstream";
    case kSampleFormatDtsxP2:
      return "Compressed DTSXP2 bitstream";
    case kSampleFormatIECDts:
      return "IEC-61937 encapsulated DTS bitstream";
    case kSampleFormatDtse:
      return "Compressed DTS Express bitstream";
  }
  NOTREACHED() << "Invalid sample format provided: " << sample_format;
}

bool IsPlanar(SampleFormat sample_format) {
  switch (sample_format) {
    case kSampleFormatPlanarU8:
    case kSampleFormatPlanarS16:
    case kSampleFormatPlanarF32:
    case kSampleFormatPlanarS32:
      return true;
    case kUnknownSampleFormat:
    case kSampleFormatU8:
    case kSampleFormatS16:
    case kSampleFormatS24:
    case kSampleFormatS32:
    case kSampleFormatF32:
    case kSampleFormatAc3:
    case kSampleFormatEac3:
    case kSampleFormatMpegHAudio:
    case kSampleFormatDts:
    case kSampleFormatDtsxP2:
    case kSampleFormatIECDts:
    case kSampleFormatDtse:
      return false;
  }

  NOTREACHED() << "Invalid sample format provided: " << sample_format;
}

bool IsInterleaved(SampleFormat sample_format) {
  switch (sample_format) {
    case kSampleFormatU8:
    case kSampleFormatS16:
    case kSampleFormatS24:
    case kSampleFormatS32:
    case kSampleFormatF32:
    case kSampleFormatAc3:
    case kSampleFormatEac3:
    case kSampleFormatMpegHAudio:
    case kSampleFormatDts:
    case kSampleFormatDtsxP2:
    case kSampleFormatIECDts:
    case kSampleFormatDtse:
      return true;
    case kUnknownSampleFormat:
    case kSampleFormatPlanarU8:
    case kSampleFormatPlanarS16:
    case kSampleFormatPlanarF32:
    case kSampleFormatPlanarS32:
      return false;
  }

  NOTREACHED() << "Invalid sample format provided: " << sample_format;
}

bool IsBitstream(SampleFormat sample_format) {
  switch (sample_format) {
    case kSampleFormatAc3:
    case kSampleFormatEac3:
    case kSampleFormatMpegHAudio:
    case kSampleFormatDts:
    case kSampleFormatDtsxP2:
    case kSampleFormatIECDts:
      // If on-device decoding is required, the sample format will be
      // kSampleFormatS16, so it will return false. If bit-stream passthrough
      // is required, the sample format would already be
      // kSampleFormatDts/DtsxP2. In this case, it should return true as below.
      return true;
    case kUnknownSampleFormat:
    case kSampleFormatU8:
    case kSampleFormatS16:
    case kSampleFormatS24:
    case kSampleFormatS32:
    case kSampleFormatF32:
    case kSampleFormatPlanarU8:
    case kSampleFormatPlanarS16:
    case kSampleFormatPlanarF32:
    case kSampleFormatPlanarS32:
    case kSampleFormatDtse:
      return false;
  }

  NOTREACHED() << "Invalid sample format provided: " << sample_format;
}

}  // namespace media