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// Copyright 2017 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 THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIARECORDER_AUDIO_TRACK_OPUS_ENCODER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIARECORDER_AUDIO_TRACK_OPUS_ENCODER_H_
#include <memory>
#include "base/macros.h"
#include "media/base/audio_bus.h"
#include "media/base/audio_converter.h"
#include "media/base/audio_fifo.h"
#include "media/base/audio_parameters.h"
#include "third_party/blink/renderer/modules/mediarecorder/audio_track_encoder.h"
#include "third_party/opus/src/include/opus.h"
namespace blink {
// Class encapsulating Opus-related encoding details. It contains an
// AudioConverter to adapt incoming data to the format Opus likes to have.
class AudioTrackOpusEncoder : public AudioTrackEncoder,
public media::AudioConverter::InputCallback {
public:
AudioTrackOpusEncoder(OnEncodedAudioCB on_encoded_audio_cb,
int32_t bits_per_second);
void OnSetFormat(const media::AudioParameters& params) override;
void EncodeAudio(std::unique_ptr<media::AudioBus> input_bus,
base::TimeTicks capture_time) override;
private:
~AudioTrackOpusEncoder() override;
bool is_initialized() const { return !!opus_encoder_; }
void DestroyExistingOpusEncoder();
// media::AudioConverted::InputCallback implementation.
double ProvideInput(media::AudioBus* audio_bus,
uint32_t frames_delayed) override;
// Target bitrate for Opus. If 0, Opus provide automatic bitrate is used.
const int32_t bits_per_second_;
// Output parameters after audio conversion. This differs from the input
// parameters only in sample_rate() and frames_per_buffer(): output should be
// 48ksamples/s and 2880, respectively.
media::AudioParameters converted_params_;
// Sample rate adapter from the input audio to what OpusEncoder desires.
std::unique_ptr<media::AudioConverter> converter_;
// Buffer for holding the original input audio before it goes to the
// converter.
std::unique_ptr<media::AudioFifo> fifo_;
// Buffer for passing AudioBus data from the converter to the encoder.
std::unique_ptr<float[]> buffer_;
OpusEncoder* opus_encoder_;
DISALLOW_COPY_AND_ASSIGN(AudioTrackOpusEncoder);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIARECORDER_AUDIO_TRACK_OPUS_ENCODER_H_