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// Copyright 2022 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_FILTERS_MAC_AUDIO_TOOLBOX_AUDIO_DECODER_H_
#define MEDIA_FILTERS_MAC_AUDIO_TOOLBOX_AUDIO_DECODER_H_
#include <memory>
#include <AudioToolbox/AudioToolbox.h>
#include "base/memory/free_deleter.h"
#include "media/base/audio_bus.h"
#include "media/base/audio_decoder.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/media_export.h"
namespace media {
class AudioBufferMemoryPool;
class AudioDiscardHelper;
// Audio decoder based on macOS's AudioToolbox API. The AudioToolbox
// API is required to decode codecs that aren't supported by Chromium.
class MEDIA_EXPORT AudioToolboxAudioDecoder : public AudioDecoder {
public:
AudioToolboxAudioDecoder();
AudioToolboxAudioDecoder(const AudioToolboxAudioDecoder&) = delete;
AudioToolboxAudioDecoder& operator=(const AudioToolboxAudioDecoder&) = delete;
~AudioToolboxAudioDecoder() override;
// AudioDecoder implementation.
AudioDecoderType GetDecoderType() const override;
void Initialize(const AudioDecoderConfig& config,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) override;
void Decode(scoped_refptr<DecoderBuffer> buffer, DecodeCB decode_cb) override;
void Reset(base::OnceClosure reset_cb) override;
bool NeedsBitstreamConversion() const override;
private:
bool CreateAACDecoder(const AudioDecoderConfig& config);
// "Converter" for turning encoded samples into raw audio.
AudioConverterRef decoder_;
// Actual channel count and layout from decoder, may be different than config.
uint32_t channel_count_ = 0u;
ChannelLayout channel_layout_ = CHANNEL_LAYOUT_UNSUPPORTED;
// Actual sample rate from the decoder, may be different than config.
uint32_t sample_rate_ = 0u;
// Callback that delivers output frames.
OutputCB output_cb_;
std::unique_ptr<AudioDiscardHelper> discard_helper_;
// Pool which helps avoid thrashing memory when returning audio buffers.
scoped_refptr<AudioBufferMemoryPool> pool_;
// Staging structures for receiving decoded data.
std::unique_ptr<AudioBus> output_bus_;
std::unique_ptr<AudioBufferList, base::FreeDeleter> output_buffer_list_;
};
} // namespace media
#endif // MEDIA_FILTERS_MAC_AUDIO_TOOLBOX_AUDIO_DECODER_H_
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