OLD | NEW |
---|---|
(Empty) | |
1 // Copyright 2014 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. | |
4 | |
5 #include "content/renderer/media/speech_recognition_audio_source_provider.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/memory/shared_memory.h" | |
9 #include "base/time/time.h" | |
10 #include "media/audio/audio_parameters.h" | |
11 #include "media/base/audio_fifo.h" | |
12 | |
13 namespace content { | |
14 | |
15 SpeechRecognitionAudioSourceProvider::SpeechRecognitionAudioSourceProvider( | |
16 const blink::WebMediaStreamTrack& track, | |
17 const media::AudioParameters& params, const base::SharedMemoryHandle memory, | |
18 base::SyncSocket* socket, OnStoppedCB on_stopped_cb) | |
19 : track_(track), | |
20 shared_memory_(memory, false), | |
21 socket_(socket), | |
22 output_params_(params), | |
23 track_stopped_(false), | |
24 buffer_index_(0), | |
25 on_stopped_cb_(on_stopped_cb) { | |
26 DCHECK(main_render_thread_checker_.CalledOnValidThread()); | |
27 DCHECK(params.IsValid()); | |
28 DCHECK(IsSupportedTrack(track)); | |
29 const size_t memory_length = media::AudioBus::CalculateMemorySize(params) + | |
30 sizeof(media::AudioInputBufferParameters); | |
31 CHECK(shared_memory_.Map(memory_length)); | |
32 | |
33 // Buffer index for sync with client is |params.size| on the shared memory. | |
34 uint8* ptr = static_cast<uint8*>(shared_memory_.memory()); | |
35 media::AudioInputBuffer* buffer = | |
36 reinterpret_cast<media::AudioInputBuffer*>(ptr); | |
37 peer_buffer_index_ = &(buffer->params.size); | |
38 | |
39 // Client must manage his own counter and reset it. | |
40 DCHECK_EQ(0U, *peer_buffer_index_); | |
41 output_bus_ = media::AudioBus::WrapMemory(params, buffer->audio); | |
42 | |
43 // Connect the source provider to the track as a sink. | |
44 MediaStreamAudioSink::AddToAudioTrack(this, track_); | |
45 } | |
46 | |
47 SpeechRecognitionAudioSourceProvider::~SpeechRecognitionAudioSourceProvider() { | |
48 DCHECK(main_render_thread_checker_.CalledOnValidThread()); | |
49 if (audio_converter_.get()) audio_converter_->RemoveInput(this); | |
no longer working on chromium
2014/09/17 15:55:19
nit, new line
burnik
2014/09/18 09:19:35
Done.
| |
50 | |
51 // Notify the track before this sink goes away. | |
52 if (!track_stopped_) | |
53 MediaStreamAudioSink::RemoveFromAudioTrack(this, track_); | |
54 } | |
55 | |
56 // static | |
57 bool SpeechRecognitionAudioSourceProvider::IsSupportedTrack( | |
58 const blink::WebMediaStreamTrack& track) { | |
59 if (track.source().type() != blink::WebMediaStreamSource::TypeAudio) | |
60 return false; | |
61 | |
62 MediaStreamAudioSource* native_source = | |
63 static_cast<MediaStreamAudioSource*>(track.source().extraData()); | |
64 if (!native_source) | |
65 return false; | |
66 | |
67 const StreamDeviceInfo& device_info = native_source->device_info(); | |
68 // Purposely only support tracks from an audio device. Dissallow WebAudio. | |
69 return (device_info.device.type == content::MEDIA_DEVICE_AUDIO_CAPTURE); | |
70 } | |
71 | |
72 void SpeechRecognitionAudioSourceProvider::OnSetFormat( | |
73 const media::AudioParameters& input_params) { | |
74 // We need detach the thread here because it will be a new capture thread | |
75 // calling OnSetFormat() and OnData() if the source is restarted. | |
76 capture_thread_checker_.DetachFromThread(); | |
77 DCHECK(capture_thread_checker_.CalledOnValidThread()); | |
78 DCHECK(input_params.IsValid()); | |
79 | |
80 input_params_ = input_params; | |
81 fifo_buffer_size_ = output_params_.frames_per_buffer() * | |
82 input_params_.sample_rate() / | |
83 output_params_.sample_rate(); | |
84 DCHECK_GE(fifo_buffer_size_, input_params_.frames_per_buffer()); | |
85 DCHECK_GE(fifo_buffer_size_, output_params_.frames_per_buffer()); | |
86 | |
87 // Allows for some delays on the endpoint client. | |
88 static const int kNumberOfBuffersInFifo = 2; | |
89 int frames_in_fifo = kNumberOfBuffersInFifo * fifo_buffer_size_; | |
90 fifo_.reset(new media::AudioFifo(input_params.channels(), frames_in_fifo)); | |
91 input_bus_ = media::AudioBus::Create(input_params.channels(), | |
92 input_params.frames_per_buffer()); | |
93 | |
94 // Create the audio converter with |disable_fifo| as false so that the | |
95 // converter will request input_params.frames_per_buffer() each time. | |
96 // This will not increase the complexity as there is only one client to | |
97 // the converter. | |
98 audio_converter_.reset( | |
99 new media::AudioConverter(input_params, output_params_, false)); | |
100 audio_converter_->AddInput(this); | |
101 } | |
102 | |
103 void SpeechRecognitionAudioSourceProvider::OnReadyStateChanged( | |
104 blink::WebMediaStreamSource::ReadyState state) { | |
105 DCHECK(main_render_thread_checker_.CalledOnValidThread()); | |
106 DCHECK(!track_stopped_); | |
107 | |
108 if (state == blink::WebMediaStreamSource::ReadyStateEnded) { | |
109 track_stopped_ = true; | |
110 if (!on_stopped_cb_.is_null()) | |
111 on_stopped_cb_.Run(); | |
112 } | |
113 } | |
114 | |
115 void SpeechRecognitionAudioSourceProvider::OnData(const int16* audio_data, | |
116 int sample_rate, | |
117 int number_of_channels, | |
118 int number_of_frames) { | |
119 DCHECK(capture_thread_checker_.CalledOnValidThread()); | |
120 DCHECK(peer_buffer_index_); | |
121 DCHECK_EQ(input_bus_->frames(), number_of_frames); | |
122 DCHECK_EQ(input_bus_->channels(), number_of_channels); | |
123 if (fifo_->frames() + number_of_frames > fifo_->max_frames()) { | |
124 NOTREACHED() << "Audio FIFO overflow"; | |
125 return; | |
126 } | |
127 // TODO(xians): A better way to handle the interleaved and deinterleaved | |
128 // format switching, see issue/317710. | |
129 input_bus_->FromInterleaved(audio_data, number_of_frames, | |
130 sizeof(audio_data[0])); | |
131 | |
132 fifo_->Push(input_bus_.get()); | |
133 // Wait for FIFO to have at least |fifo_buffer_size_| frames ready. | |
134 if (fifo_->frames() < fifo_buffer_size_) | |
135 return; | |
136 | |
137 // Make sure the previous output buffer was consumed by client before we send | |
138 // the next buffer. |peer_buffer_index_| is pointing to shared memory. | |
139 // The client must write to it (incrementing by 1) once the the buffer was | |
140 // consumed. This is intentional not to block this audio capturing thread. | |
141 if (buffer_index_ != (*peer_buffer_index_)) { | |
142 DLOG(WARNING) << "Buffer synchronization lag"; | |
no longer working on chromium
2014/09/17 15:55:19
hmm, thinking about these code a bit, it seems ris
burnik
2014/09/18 09:19:35
If indices are out of sync, that would indicate th
| |
143 return; | |
144 } | |
145 | |
146 audio_converter_->Convert(output_bus_.get()); | |
147 | |
148 // Notify client to consume buffer |buffer_index_| on |output_bus_|. | |
149 const size_t bytes_sent = | |
150 socket_->Send(&buffer_index_, sizeof(buffer_index_)); | |
151 if (bytes_sent != sizeof(buffer_index_)) { | |
152 // The send usually fails if the user changes his input audio device. | |
153 DVLOG(1) << "Failed sending buffer index to peer"; | |
154 // We have discarded this buffer, but could still recover on the next one. | |
155 return; | |
156 } | |
157 | |
158 // Count the sent buffer. We expect the client to do the same on his end. | |
159 ++buffer_index_; | |
160 } | |
161 | |
162 double SpeechRecognitionAudioSourceProvider::ProvideInput( | |
163 media::AudioBus* audio_bus, base::TimeDelta buffer_delay) { | |
164 DCHECK(capture_thread_checker_.CalledOnValidThread()); | |
165 if (fifo_->frames() >= audio_bus->frames()) | |
166 fifo_->Consume(audio_bus, 0, audio_bus->frames()); | |
167 else | |
168 audio_bus->Zero(); | |
169 | |
170 return 1.0; | |
171 } | |
172 | |
173 } // namespace content | |
OLD | NEW |