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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;
// Implementation of AudioOutputStream using sndio(7)
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;
void SetOutputDeviceForAec(const std::string& output_device_id) override;
private:
enum StreamState {
kClosed, // Not opened yet
kStopped, // Device opened, but not started yet
kRunning, // Started, device playing
kStopWait // Stopping, waiting for the real-time thread to exit
};
// C-style call-backs
static void OnMoveCallback(void *arg, int delta);
static void* ThreadEntry(void *arg);
// Continuously moves data from the device to the consumer
void ThreadLoop();
// Our creator, the audio manager needs to be notified when we close.
AudioManagerBase* manager;
// Parameters of the source
AudioParameters params;
// We store data here for consumer
std::unique_ptr<AudioBus> audio_bus;
// Call-back that consumes recorded data
AudioInputCallback* callback; // Valid during a recording session.
// Handle of the audio device
struct sio_hdl* hdl;
// Current state of the stream
enum StreamState state;
// High priority thread running ThreadLoop()
pthread_t thread;
// Number of frames buffered in the hardware
int hw_delay;
// Temporary buffer where data is stored sndio-compatible format
char* buffer;
DISALLOW_COPY_AND_ASSIGN(SndioAudioInputStream);
};
} // namespace media
#endif // MEDIA_AUDIO_SNDIO_SNDIO_INPUT_H_
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