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Side by Side Diff: media/base/multi_channel_resampler.h

Issue 1211203006: Fixes issue where Web Speech API drops a frame every 5.1 seconds (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 5 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 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 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 #ifndef MEDIA_BASE_MULTI_CHANNEL_RESAMPLER_H_ 5 #ifndef MEDIA_BASE_MULTI_CHANNEL_RESAMPLER_H_
6 #define MEDIA_BASE_MULTI_CHANNEL_RESAMPLER_H_ 6 #define MEDIA_BASE_MULTI_CHANNEL_RESAMPLER_H_
7 7
8 #include <vector> 8 #include <vector>
9 9
10 #include "base/callback.h" 10 #include "base/callback.h"
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28 // Constructs a MultiChannelResampler with the specified |read_cb|, which is 28 // Constructs a MultiChannelResampler with the specified |read_cb|, which is
29 // used to acquire audio data for resampling. |io_sample_rate_ratio| is the 29 // used to acquire audio data for resampling. |io_sample_rate_ratio| is the
30 // ratio of input / output sample rates. |request_frames| is the size in 30 // ratio of input / output sample rates. |request_frames| is the size in
31 // frames of the AudioBus to be filled by |read_cb|. 31 // frames of the AudioBus to be filled by |read_cb|.
32 MultiChannelResampler(int channels, 32 MultiChannelResampler(int channels,
33 double io_sample_rate_ratio, 33 double io_sample_rate_ratio,
34 size_t request_frames, 34 size_t request_frames,
35 const ReadCB& read_cb); 35 const ReadCB& read_cb);
36 virtual ~MultiChannelResampler(); 36 virtual ~MultiChannelResampler();
37 37
38 void PrimeWithSilence();
39
38 // Resamples |frames| of data from |read_cb_| into AudioBus. 40 // Resamples |frames| of data from |read_cb_| into AudioBus.
39 void Resample(int frames, AudioBus* audio_bus); 41 void Resample(int frames, AudioBus* audio_bus);
40 42
41 // Flush all buffered data and reset internal indices. Not thread safe, do 43 // Flush all buffered data and reset internal indices. Not thread safe, do
42 // not call while Resample() is in progress. 44 // not call while Resample() is in progress.
43 void Flush(); 45 void Flush();
44 46
45 // Update ratio for all SincResamplers. SetRatio() will cause reconstruction 47 // Update ratio for all SincResamplers. SetRatio() will cause reconstruction
46 // of the kernels used for resampling. Not thread safe, do not call while 48 // of the kernels used for resampling. Not thread safe, do not call while
47 // Resample() is in progress. 49 // Resample() is in progress.
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75 // The number of output frames that have successfully been processed during 77 // The number of output frames that have successfully been processed during
76 // the current Resample() call. 78 // the current Resample() call.
77 int output_frames_ready_; 79 int output_frames_ready_;
78 80
79 DISALLOW_COPY_AND_ASSIGN(MultiChannelResampler); 81 DISALLOW_COPY_AND_ASSIGN(MultiChannelResampler);
80 }; 82 };
81 83
82 } // namespace media 84 } // namespace media
83 85
84 #endif // MEDIA_BASE_MULTI_CHANNEL_RESAMPLER_H_ 86 #endif // MEDIA_BASE_MULTI_CHANNEL_RESAMPLER_H_
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