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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <AudioToolbox/AudioFormat.h>
#include <AudioToolbox/AudioQueue.h>
#include <stdint.h>
#include <memory>
#include "base/atomicops.h"
#include "base/cancelable_callback.h"
#include "base/compiler_specific.h"
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "media/audio/audio_io.h"
#include "media/base/audio_parameters.h"
namespace media {
class AudioBus;
class AudioManagerMac;
// Implementation of AudioInputStream for macOS using the Audio Queue service
// in Audio Toolbox. Design reflects PCMQueueOutAudioOutputStream.
class PCMQueueInAudioInputStream : public AudioInputStream {
// Parameters as per AudioManager::MakeAudioInputStream.
PCMQueueInAudioInputStream(AudioManagerMac* manager,
const AudioParameters& params);
PCMQueueInAudioInputStream(const PCMQueueInAudioInputStream&) = delete;
PCMQueueInAudioInputStream& operator=(const PCMQueueInAudioInputStream&) =
~PCMQueueInAudioInputStream() override;
// Implementation of AudioInputStream.
AudioInputStream::OpenOutcome Open() override;
void Start(AudioInputCallback* callback) override;
void Stop() override;
void Close() override;
double GetMaxVolume() override;
void SetVolume(double volume) override;
double GetVolume() override;
bool SetAutomaticGainControl(bool enabled) override;
bool GetAutomaticGainControl() override;
bool IsMuted() override;
void SetOutputDeviceForAec(const std::string& output_device_id) override;
// Issue the OnError to |callback_|;
void HandleError(OSStatus err);
// Allocates and prepares the memory that will be used for recording.
bool SetupBuffers();
// Sends a buffer to the audio driver for recording.
OSStatus QueueNextBuffer(AudioQueueBufferRef audio_buffer);
// Callback from OS, delegates to non-static version below.
static void HandleInputBufferStatic(
void* data,
AudioQueueRef audio_queue,
AudioQueueBufferRef audio_buffer,
const AudioTimeStamp* start_time,
UInt32 num_packets,
const AudioStreamPacketDescription* desc);
// Handles callback from OS. Will be called on OS internal thread.
void HandleInputBuffer(AudioQueueRef audio_queue,
AudioQueueBufferRef audio_buffer,
const AudioTimeStamp* start_time,
UInt32 num_packets,
const AudioStreamPacketDescription* packet_desc);
static const int kNumberBuffers = 3;
// Helper methods to set and get atomic |input_callback_is_active_|.
void SetInputCallbackIsActive(bool active);
bool GetInputCallbackIsActive();
// Checks if a stream was started successfully and the audio unit also starts
// to call InputProc() as it should. This method is called once when a timer
// expires, a few seconds after calling Start().
void CheckInputStartupSuccess();
// Manager that owns this stream, used for closing down.
raw_ptr<AudioManagerMac> manager_;
// We use the callback mostly to periodically supply the recorded audio data.
raw_ptr<AudioInputCallback> callback_;
// Structure that holds the stream format details such as bitrate.
AudioStreamBasicDescription format_;
// Handle to the OS audio queue object.
AudioQueueRef audio_queue_;
// Size of each of the buffers in |audio_buffers_|
uint32_t buffer_size_bytes_;
// True iff Start() has been called successfully.
bool started_;
// Used to determine if we need to slow down |callback_| calls.
base::TimeTicks last_fill_;
// Used to defer Start() to workaround
base::CancelableOnceClosure deferred_start_cb_;
// Is set to true on the internal AUHAL IO thread in the first input callback
// after Start() has bee called.
base::subtle::Atomic32 input_callback_is_active_;
// Timer which triggers CheckInputStartupSuccess() to verify that input
// callbacks have started as intended after a successful call to Start().
// This timer lives on the main browser thread.
std::unique_ptr<base::OneShotTimer> input_callback_timer_;
std::unique_ptr<media::AudioBus> audio_bus_;
} // namespace media