src/starboard/shared/starboard/audio_sink/audio_sink_get_min_buffer_size_in_frames.cc

// Copyright 2019 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "starboard/audio_sink.h"

#include "starboard/common/log.h"

int SbAudioSinkGetMinBufferSizeInFrames(int channels,
                                        SbMediaAudioSampleType sample_type,
                                        int sampling_frequency_hz) {
  if (channels <= 0 || channels > SbAudioSinkGetMaxChannels()) {
    SB_LOG(ERROR) << "Not support channels count " << channels;
    return -1;
  }
  if (sample_type != kSbMediaAudioSampleTypeInt16Deprecated &&
      sample_type != kSbMediaAudioSampleTypeFloat32) {
    SB_LOG(ERROR) << "Not support sample type " << sample_type;
    return -1;
  }
  if (sampling_frequency_hz <= 0) {
    SB_LOG(ERROR) << "Not support sample frequency " << sampling_frequency_hz;
    return -1;
  }
  // Larger buffer size would have more latency when changing playback rate.
  if (sampling_frequency_hz < 24000) {
    return 4 * 1024;
  }

  return 8 * 1024;
}