1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef MEDIA_AUDIO_MAC_AUDIO_INPUT_MAC_H_
6 #define MEDIA_AUDIO_MAC_AUDIO_INPUT_MAC_H_
8 #include <AudioToolbox/AudioFormat.h>
9 #include <AudioToolbox/AudioQueue.h>
11 #include "base/cancelable_callback.h"
12 #include "base/compiler_specific.h"
13 #include "base/time/time.h"
14 #include "media/audio/audio_io.h"
15 #include "media/audio/audio_parameters.h"
19 class AudioManagerMac;
21 // Implementation of AudioInputStream for Mac OS X using the audio queue service
22 // present in OS 10.5 and later. Design reflects PCMQueueOutAudioOutputStream.
23 class PCMQueueInAudioInputStream : public AudioInputStream {
25 // Parameters as per AudioManager::MakeAudioInputStream.
26 PCMQueueInAudioInputStream(AudioManagerMac* manager,
27 const AudioParameters& params);
28 virtual ~PCMQueueInAudioInputStream();
30 // Implementation of AudioInputStream.
31 virtual bool Open() OVERRIDE;
32 virtual void Start(AudioInputCallback* callback) OVERRIDE;
33 virtual void Stop() OVERRIDE;
34 virtual void Close() OVERRIDE;
35 virtual double GetMaxVolume() OVERRIDE;
36 virtual void SetVolume(double volume) OVERRIDE;
37 virtual double GetVolume() OVERRIDE;
38 virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
39 virtual bool GetAutomaticGainControl() OVERRIDE;
42 // Issue the OnError to |callback_|;
43 void HandleError(OSStatus err);
45 // Allocates and prepares the memory that will be used for recording.
48 // Sends a buffer to the audio driver for recording.
49 OSStatus QueueNextBuffer(AudioQueueBufferRef audio_buffer);
51 // Callback from OS, delegates to non-static version below.
52 static void HandleInputBufferStatic(
54 AudioQueueRef audio_queue,
55 AudioQueueBufferRef audio_buffer,
56 const AudioTimeStamp* start_time,
58 const AudioStreamPacketDescription* desc);
60 // Handles callback from OS. Will be called on OS internal thread.
61 void HandleInputBuffer(AudioQueueRef audio_queue,
62 AudioQueueBufferRef audio_buffer,
63 const AudioTimeStamp* start_time,
65 const AudioStreamPacketDescription* packet_desc);
67 static const int kNumberBuffers = 3;
69 // Manager that owns this stream, used for closing down.
70 AudioManagerMac* manager_;
71 // We use the callback mostly to periodically supply the recorded audio data.
72 AudioInputCallback* callback_;
73 // Structure that holds the stream format details such as bitrate.
74 AudioStreamBasicDescription format_;
75 // Handle to the OS audio queue object.
76 AudioQueueRef audio_queue_;
77 // Size of each of the buffers in |audio_buffers_|
78 uint32 buffer_size_bytes_;
79 // True iff Start() has been called successfully.
81 // Used to determine if we need to slow down |callback_| calls.
82 base::TimeTicks last_fill_;
83 // Used to defer Start() to workaround http://crbug.com/160920.
84 base::CancelableClosure deferred_start_cb_;
86 DISALLOW_COPY_AND_ASSIGN(PCMQueueInAudioInputStream);
91 #endif // MEDIA_AUDIO_MAC_AUDIO_INPUT_MAC_H_