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head/www/qt5-webengine/files/sndio_input.h
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// Copyright 2013 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_SNDIO_SNDIO_INPUT_H_ | |||||
#define MEDIA_AUDIO_SNDIO_SNDIO_INPUT_H_ | |||||
#include <stdint.h> | |||||
#include <string> | |||||
#include <sndio.h> | |||||
#include "base/compiler_specific.h" | |||||
#include "base/macros.h" | |||||
#include "base/memory/weak_ptr.h" | |||||
#include "base/time/time.h" | |||||
#include "media/audio/agc_audio_stream.h" | |||||
#include "media/audio/audio_io.h" | |||||
#include "media/audio/audio_device_description.h" | |||||
#include "media/base/audio_parameters.h" | |||||
namespace media { | |||||
class AudioManagerBase; | |||||
// call-backs invoked from C libraries, thus requiring C linkage | |||||
extern "C" { | |||||
// Invoked (on the real-time thread) at each sound card clock tick | |||||
void sndio_in_onmove(void *arg, int delta); | |||||
// Invoked (on the real-time thread) whenever the volume changes | |||||
void sndio_in_onvol(void *arg, unsigned int vol); | |||||
// Real-time thread entry point | |||||
void *sndio_in_threadstart(void *arg); | |||||
} | |||||
// Provides an input stream for audio capture based on the SNDIO PCM interface. | |||||
// This object is not thread safe and all methods should be invoked in the | |||||
// thread that created the object. | |||||
class SndioAudioInputStream : public AgcAudioStream<AudioInputStream> { | |||||
public: | |||||
// Pass this to the constructor if you want to attempt auto-selection | |||||
// of the audio recording device. | |||||
static const char kAutoSelectDevice[]; | |||||
// Create a PCM Output stream for the SNDIO device identified by | |||||
// |device_name|. If unsure of what to use for |device_name|, use | |||||
// |kAutoSelectDevice|. | |||||
SndioAudioInputStream(AudioManagerBase* audio_manager, | |||||
const std::string& device_name, | |||||
const AudioParameters& params); | |||||
~SndioAudioInputStream() override; | |||||
// Implementation of AudioInputStream. | |||||
bool Open() override; | |||||
void Start(AudioInputCallback* callback) override; | |||||
void Stop() override; | |||||
void Close() override; | |||||
double GetMaxVolume() override; | |||||
void SetVolume(double volume) override; | |||||
double GetVolume() override; | |||||
bool IsMuted() override; | |||||
// C-linkage call-backs are friends to access private data | |||||
friend void sndio_in_onmove(void *arg, int delta); | |||||
friend void sndio_in_onvol(void *arg, unsigned int vol); | |||||
friend void *sndio_in_threadstart(void *arg); | |||||
private: | |||||
// Logs the error and invokes any registered callbacks. | |||||
void HandleError(const char* method, int error); | |||||
// Reads one or more buffers of audio from the device, passes on to the | |||||
// registered callback and schedules the next read. | |||||
void ReadAudio(); | |||||
// Recovers from any device errors if possible. | |||||
bool Recover(int error); | |||||
// Non-refcounted pointer back to the audio manager. | |||||
// The AudioManager indirectly holds on to stream objects, so we don't | |||||
// want circular references. Additionally, stream objects live on the audio | |||||
// thread, which is owned by the audio manager and we don't want to addref | |||||
// the manager from that thread. | |||||
AudioManagerBase* audio_manager_; | |||||
std::string device_name_; | |||||
AudioParameters params_; | |||||
int bytes_per_buffer_; | |||||
base::TimeDelta buffer_duration_; // Length of each recorded buffer. | |||||
AudioInputCallback* callback_; // Valid during a recording session. | |||||
base::TimeTicks next_read_time_; // Scheduled time for next read callback. | |||||
struct sio_hdl* device_handle_; // Handle to the SNDIO PCM recording device. | |||||
std::unique_ptr<uint8_t[]> audio_buffer_; // Buffer used for reading audio data. | |||||
bool read_callback_behind_schedule_; | |||||
std::unique_ptr<AudioBus> audio_bus_; | |||||
int hw_delay_; | |||||
int sndio_rec_bufsize_; | |||||
int sndio_rec_bufsz_; | |||||
// High priority thread running RealTimeThread() | |||||
pthread_t thread_; | |||||
DISALLOW_COPY_AND_ASSIGN(SndioAudioInputStream); | |||||
}; | |||||
} // namespace media | |||||
#endif // MEDIA_AUDIO_SNDIO_SNDIO_INPUT_H_ |