15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define MEDIA_AUDIO_SIMPLE_SOURCES_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/synchronization/lock.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/audio/audio_io.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/seekable_buffer.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// An audio source that produces a pure sinusoidal tone. 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class MEDIA_EXPORT SineWaveAudioSource 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : public AudioOutputStream::AudioSourceCallback { 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |channels| is the number of audio channels, |freq| is the frequency in 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // hertz and it has to be less than half of the sampling frequency 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |sample_freq| or else you will get aliasing. 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SineWaveAudioSource(int channels, double freq, double sample_freq); 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~SineWaveAudioSource() {} 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Return up to |cap| samples of data via OnMoreData(). Use Reset() to 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // allow more data to be served. 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void CapSamples(int cap); 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void Reset(); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Implementation of AudioSourceCallback. 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual int OnMoreData(AudioBus* audio_bus, 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AudioBuffersState audio_buffers) OVERRIDE; 322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnError(AudioOutputStream* stream) OVERRIDE; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The number of OnMoreData()+OnMoreIOData() and OnError() calls respectively. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int callbacks() { return callbacks_; } 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int errors() { return errors_; } 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) protected: 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int channels_; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) double f_; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int time_state_; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int cap_; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int callbacks_; 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int errors_; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Lock time_lock_; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // MEDIA_AUDIO_SIMPLE_SOURCES_H_ 51