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// Copyright (c) 2012 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_AUDIO_MAC_AUDIO_INPUT_MAC_H_
#define MEDIA_AUDIO_MAC_AUDIO_INPUT_MAC_H_
#include <AudioToolbox/AudioFormat.h>
#include <AudioToolbox/AudioQueue.h>
#include "base/compiler_specific.h"
#include "base/time/time.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_parameters.h"
namespace media {
class AudioManagerBase;
// Implementation of AudioInputStream for Mac OS X using the audio queue service
// present in OS 10.5 and later. Design reflects PCMQueueOutAudioOutputStream.
class PCMQueueInAudioInputStream : public AudioInputStream {
public:
// Parameters as per AudioManager::MakeAudioInputStream.
PCMQueueInAudioInputStream(AudioManagerBase* manager,
const AudioParameters& params);
virtual ~PCMQueueInAudioInputStream();
// Implementation of AudioInputStream.
virtual bool Open() OVERRIDE;
virtual void Start(AudioInputCallback* callback) OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Close() OVERRIDE;
virtual double GetMaxVolume() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE;
virtual double GetVolume() OVERRIDE;
virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
virtual bool GetAutomaticGainControl() OVERRIDE;
private:
// 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;
// Manager that owns this stream, used for closing down.
AudioManagerBase* manager_;
// We use the callback mostly to periodically supply the recorded audio data.
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 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_;
DISALLOW_COPY_AND_ASSIGN(PCMQueueInAudioInputStream);
};
} // namespace media
#endif // MEDIA_AUDIO_MAC_AUDIO_INPUT_MAC_H_