| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_ |
| #define MEDIA_AUDIO_SIMPLE_SOURCES_H_ |
| |
| #include <stdint.h> |
| |
| #include <memory> |
| |
| #include "base/files/file_path.h" |
| #include "base/synchronization/lock.h" |
| #include "base/time/time.h" |
| #include "media/audio/audio_io.h" |
| #include "media/base/audio_converter.h" |
| #include "media/base/seekable_buffer.h" |
| |
| namespace media { |
| |
| class WavAudioHandler; |
| |
| // An audio source that produces a pure sinusoidal tone. |
| class MEDIA_EXPORT SineWaveAudioSource |
| : public AudioOutputStream::AudioSourceCallback { |
| public: |
| // |channels| is the number of audio channels, |freq| is the frequency in |
| // hertz and it has to be less than half of the sampling frequency |
| // |sample_freq| or else you will get aliasing. |
| SineWaveAudioSource(int channels, double freq, double sample_freq); |
| ~SineWaveAudioSource() override; |
| |
| // Return up to |cap| samples of data via OnMoreData(). Use Reset() to |
| // allow more data to be served. |
| void CapSamples(int cap); |
| void Reset(); |
| |
| // Implementation of AudioSourceCallback. |
| int OnMoreData(base::TimeDelta delay, |
| base::TimeTicks timestamp, |
| int prior_frames_skipped, |
| AudioBus* dest) override; |
| void OnError() override; |
| |
| // The number of OnMoreData() and OnError() calls respectively. |
| int callbacks() { return callbacks_; } |
| int errors() { return errors_; } |
| |
| protected: |
| int channels_; |
| double f_; |
| int time_state_; |
| int cap_; |
| int callbacks_; |
| int errors_; |
| base::Lock time_lock_; |
| }; |
| |
| class MEDIA_EXPORT FileSource : public AudioOutputStream::AudioSourceCallback, |
| public AudioConverter::InputCallback { |
| public: |
| FileSource(const AudioParameters& params, |
| const base::FilePath& path_to_wav_file, |
| bool loop); |
| ~FileSource() override; |
| |
| // Implementation of AudioSourceCallback. |
| int OnMoreData(base::TimeDelta delay, |
| base::TimeTicks delay_timestamp, |
| int prior_frames_skipped, |
| AudioBus* dest) override; |
| void OnError() override; |
| |
| private: |
| AudioParameters params_; |
| base::FilePath path_to_wav_file_; |
| |
| // The WAV data at |path_to_wav_file_| is read into memory and kept here. |
| // This memory needs to survive for the lifetime of |wav_audio_handler_|, |
| // so declare it first. Do not access this member directly. |
| std::unique_ptr<char[]> raw_wav_data_; |
| |
| std::unique_ptr<WavAudioHandler> wav_audio_handler_; |
| std::unique_ptr<AudioConverter> file_audio_converter_; |
| int wav_file_read_pos_; |
| bool load_failed_; |
| bool looping_; |
| |
| // Provides audio data from wav_audio_handler_ into the file audio converter. |
| double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override; |
| |
| // Loads the wav file on the first OnMoreData invocation. |
| void LoadWavFile(const base::FilePath& path_to_wav_file); |
| |
| // Rewinds the player to the start of the loaded wav file. |
| void Rewind(); |
| }; |
| |
| class BeepingSource : public AudioOutputStream::AudioSourceCallback { |
| public: |
| explicit BeepingSource(const AudioParameters& params); |
| ~BeepingSource() override; |
| |
| // Implementation of AudioSourceCallback. |
| int OnMoreData(base::TimeDelta delay, |
| base::TimeTicks delay_timestamp, |
| int prior_frames_skipped, |
| AudioBus* dest) override; |
| void OnError() override; |
| |
| static void BeepOnce(); |
| private: |
| int buffer_size_; |
| std::unique_ptr<uint8_t[]> buffer_; |
| AudioParameters params_; |
| base::TimeTicks last_callback_time_; |
| base::TimeDelta interval_from_last_beep_; |
| int beep_duration_in_buffers_; |
| int beep_generated_in_buffers_; |
| int beep_period_in_frames_; |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_AUDIO_SIMPLE_SOURCES_H_ |