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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "media/audio/cras/cras_unified.h" | 5 #include "media/audio/cras/cras_unified.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "media/audio/cras/audio_manager_cras.h" | 8 #include "media/audio/cras/audio_manager_cras.h" |
9 | 9 |
10 namespace media { | 10 namespace media { |
11 | 11 |
12 // Overview of operation: | 12 // Overview of operation: |
13 // 1) An object of CrasUnifiedStream is created by the AudioManager | 13 // 1) An object of CrasUnifiedStream is created by the AudioManager |
14 // factory: audio_man->MakeAudioStream(). | 14 // factory: audio_man->MakeAudioStream(). |
15 // 2) Next some thread will call Open(), at that point a client is created and | 15 // 2) Next some thread will call Open(), at that point a client is created and |
16 // configured for the correct format and sample rate. | 16 // configured for the correct format and sample rate. |
17 // 3) Then Start(source) is called and a stream is added to the CRAS client | 17 // 3) Then Start(source) is called and a stream is added to the CRAS client |
18 // which will create its own thread that periodically calls the source for more | 18 // which will create its own thread that periodically calls the source for more |
19 // data as buffers are being consumed. | 19 // data as buffers are being consumed. |
20 // 4) When finished Stop() is called, which is handled by stopping the stream. | 20 // 4) When finished Stop() is called, which is handled by stopping the stream. |
21 // 5) Finally Close() is called. It cleans up and notifies the audio manager, | 21 // 5) Finally Close() is called. It cleans up and notifies the audio manager, |
22 // which likely will destroy this object. | 22 // which likely will destroy this object. |
23 // | 23 // |
24 // For output-only streams, a unified stream is created with 0 input channels. | |
25 // | |
26 // Simplified data flow for unified streams: | |
27 // | |
28 // +-------------+ +------------------+ | |
29 // | CRAS Server | | Chrome Client | | |
30 // +------+------+ Add Stream +---------+--------+ | |
31 // |<----------------------------------| | |
32 // | | | |
33 // | buffer_frames captured to shm | | |
34 // |---------------------------------->| | |
35 // | | UnifiedCallback() | |
36 // | | ReadWriteAudio() | |
37 // | | | |
38 // | buffer_frames written to shm | | |
39 // |<----------------------------------| | |
40 // | | | |
41 // ... Repeats for each block. ... | |
42 // | | | |
43 // | | | |
44 // | Remove stream | | |
45 // |<----------------------------------| | |
46 // | | | |
47 // | |
48 // Simplified data flow for output only streams: | 24 // Simplified data flow for output only streams: |
49 // | 25 // |
50 // +-------------+ +------------------+ | 26 // +-------------+ +------------------+ |
51 // | CRAS Server | | Chrome Client | | 27 // | CRAS Server | | Chrome Client | |
52 // +------+------+ Add Stream +---------+--------+ | 28 // +------+------+ Add Stream +---------+--------+ |
53 // |<----------------------------------| | 29 // |<----------------------------------| |
54 // | | | 30 // | | |
55 // | Near out of samples, request more | | 31 // | Near out of samples, request more | |
56 // |---------------------------------->| | 32 // |---------------------------------->| |
57 // | | UnifiedCallback() | 33 // | | UnifiedCallback() |
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79 params_(params), | 55 params_(params), |
80 bytes_per_frame_(0), | 56 bytes_per_frame_(0), |
81 is_playing_(false), | 57 is_playing_(false), |
82 volume_(1.0), | 58 volume_(1.0), |
83 manager_(manager), | 59 manager_(manager), |
84 source_callback_(NULL), | 60 source_callback_(NULL), |
85 stream_direction_(CRAS_STREAM_OUTPUT) { | 61 stream_direction_(CRAS_STREAM_OUTPUT) { |
86 DCHECK(manager_); | 62 DCHECK(manager_); |
87 DCHECK(params_.channels() > 0); | 63 DCHECK(params_.channels() > 0); |
88 | 64 |
89 // Must have at least one input or output. If there are both they must be the | |
90 // same. | |
91 int input_channels = params_.input_channels(); | |
92 | |
93 if (input_channels) { | |
94 // A unified stream for input and output. | |
95 DCHECK(params_.channels() == input_channels); | |
96 stream_direction_ = CRAS_STREAM_UNIFIED; | |
97 input_bus_ = AudioBus::Create(input_channels, | |
98 params_.frames_per_buffer()); | |
99 } | |
100 | |
101 output_bus_ = AudioBus::Create(params); | 65 output_bus_ = AudioBus::Create(params); |
102 } | 66 } |
103 | 67 |
104 CrasUnifiedStream::~CrasUnifiedStream() { | 68 CrasUnifiedStream::~CrasUnifiedStream() { |
105 DCHECK(!is_playing_); | 69 DCHECK(!is_playing_); |
106 } | 70 } |
107 | 71 |
108 bool CrasUnifiedStream::Open() { | 72 bool CrasUnifiedStream::Open() { |
109 // Sanity check input values. | 73 // Sanity check input values. |
110 if (params_.sample_rate() <= 0) { | 74 if (params_.sample_rate() <= 0) { |
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318 uint8* input_samples, | 282 uint8* input_samples, |
319 uint8* output_samples, | 283 uint8* output_samples, |
320 const timespec* input_ts, | 284 const timespec* input_ts, |
321 const timespec* output_ts) { | 285 const timespec* output_ts) { |
322 switch (stream_direction_) { | 286 switch (stream_direction_) { |
323 case CRAS_STREAM_OUTPUT: | 287 case CRAS_STREAM_OUTPUT: |
324 return WriteAudio(frames, output_samples, output_ts); | 288 return WriteAudio(frames, output_samples, output_ts); |
325 case CRAS_STREAM_INPUT: | 289 case CRAS_STREAM_INPUT: |
326 NOTREACHED() << "CrasUnifiedStream doesn't support input streams."; | 290 NOTREACHED() << "CrasUnifiedStream doesn't support input streams."; |
327 return 0; | 291 return 0; |
328 case CRAS_STREAM_UNIFIED: | |
329 return ReadWriteAudio(frames, input_samples, output_samples, | |
330 input_ts, output_ts); | |
331 default: | 292 default: |
332 break; | 293 break; |
333 } | 294 } |
334 | 295 |
335 return 0; | 296 return 0; |
336 } | 297 } |
337 | 298 |
338 // Note these are run from a real time thread, so don't waste cycles here. | |
339 uint32 CrasUnifiedStream::ReadWriteAudio(size_t frames, | |
340 uint8* input_samples, | |
341 uint8* output_samples, | |
342 const timespec* input_ts, | |
343 const timespec* output_ts) { | |
344 DCHECK_EQ(frames, static_cast<size_t>(output_bus_->frames())); | |
345 DCHECK(source_callback_); | |
346 | |
347 uint32 bytes_per_sample = bytes_per_frame_ / params_.channels(); | |
348 input_bus_->FromInterleaved(input_samples, frames, bytes_per_sample); | |
349 | |
350 // Determine latency and pass that on to the source. We have the capture time | |
351 // of the first input sample and the playback time of the next audio sample | |
352 // passed from the audio server, add them together for total latency. | |
353 uint32 total_delay_bytes; | |
354 timespec latency_ts = {0, 0}; | |
355 cras_client_calc_capture_latency(input_ts, &latency_ts); | |
356 total_delay_bytes = GetBytesLatency(latency_ts); | |
357 cras_client_calc_playback_latency(output_ts, &latency_ts); | |
358 total_delay_bytes += GetBytesLatency(latency_ts); | |
359 | |
360 int frames_filled = source_callback_->OnMoreData( | |
361 output_bus_.get(), | |
362 AudioBuffersState(0, total_delay_bytes)); | |
363 | |
364 output_bus_->ToInterleaved(frames_filled, bytes_per_sample, output_samples); | |
365 | |
366 return frames_filled; | |
367 } | |
368 | |
369 uint32 CrasUnifiedStream::WriteAudio(size_t frames, | 299 uint32 CrasUnifiedStream::WriteAudio(size_t frames, |
370 uint8* buffer, | 300 uint8* buffer, |
371 const timespec* sample_ts) { | 301 const timespec* sample_ts) { |
372 DCHECK_EQ(frames, static_cast<size_t>(output_bus_->frames())); | 302 DCHECK_EQ(frames, static_cast<size_t>(output_bus_->frames())); |
373 | 303 |
374 // Determine latency and pass that on to the source. | 304 // Determine latency and pass that on to the source. |
375 timespec latency_ts = {0, 0}; | 305 timespec latency_ts = {0, 0}; |
376 cras_client_calc_playback_latency(sample_ts, &latency_ts); | 306 cras_client_calc_playback_latency(sample_ts, &latency_ts); |
377 | 307 |
378 int frames_filled = source_callback_->OnMoreData( | 308 int frames_filled = source_callback_->OnMoreData( |
379 output_bus_.get(), AudioBuffersState(0, GetBytesLatency(latency_ts))); | 309 output_bus_.get(), AudioBuffersState(0, GetBytesLatency(latency_ts))); |
380 | 310 |
381 // Note: If this ever changes to output raw float the data must be clipped and | 311 // Note: If this ever changes to output raw float the data must be clipped and |
382 // sanitized since it may come from an untrusted source such as NaCl. | 312 // sanitized since it may come from an untrusted source such as NaCl. |
383 output_bus_->ToInterleaved( | 313 output_bus_->ToInterleaved( |
384 frames_filled, bytes_per_frame_ / params_.channels(), buffer); | 314 frames_filled, bytes_per_frame_ / params_.channels(), buffer); |
385 | 315 |
386 return frames_filled; | 316 return frames_filled; |
387 } | 317 } |
388 | 318 |
389 void CrasUnifiedStream::NotifyStreamError(int err) { | 319 void CrasUnifiedStream::NotifyStreamError(int err) { |
390 // This will remove the stream from the client. | 320 // This will remove the stream from the client. |
391 if (source_callback_) | 321 if (source_callback_) |
392 source_callback_->OnError(this); | 322 source_callback_->OnError(this); |
393 } | 323 } |
394 | 324 |
395 } // namespace media | 325 } // namespace media |
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