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// 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_PULSE_PULSE_UTIL_H_
#define MEDIA_AUDIO_PULSE_PULSE_UTIL_H_
#include <pulse/pulseaudio.h>
#include <string>
#include "base/macros.h"
#include "base/time/time.h"
#include "media/audio/audio_device_name.h"
#include "media/base/channel_layout.h"
namespace media {
class AudioParameters;
namespace pulse {
// A helper class that acquires pa_threaded_mainloop_lock() while in scope.
class AutoPulseLock {
public:
explicit AutoPulseLock(pa_threaded_mainloop* pa_mainloop)
: pa_mainloop_(pa_mainloop) {
pa_threaded_mainloop_lock(pa_mainloop_);
}
~AutoPulseLock() {
pa_threaded_mainloop_unlock(pa_mainloop_);
}
private:
pa_threaded_mainloop* pa_mainloop_;
DISALLOW_COPY_AND_ASSIGN(AutoPulseLock);
};
bool MEDIA_EXPORT InitPulse(pa_threaded_mainloop** mainloop,
pa_context** context);
void DestroyPulse(pa_threaded_mainloop* mainloop, pa_context* context);
// Triggers pa_threaded_mainloop_signal() to avoid deadlocks.
void StreamSuccessCallback(pa_stream* s, int error, void* mainloop);
void ContextStateCallback(pa_context* context, void* mainloop);
pa_sample_format_t BitsToPASampleFormat(int bits_per_sample);
pa_channel_map ChannelLayoutToPAChannelMap(ChannelLayout channel_layout);
void WaitForOperationCompletion(pa_threaded_mainloop* mainloop,
pa_operation* operation);
base::TimeDelta GetHardwareLatency(pa_stream* stream);
// Create a recording stream for the threaded mainloop, return true if success,
// otherwise false. |mainloop| and |context| have to be from a valid Pulse
// threaded mainloop and the handle of the created stream will be returned by
// |stream|.
bool CreateInputStream(pa_threaded_mainloop* mainloop,
pa_context* context,
pa_stream** stream,
const AudioParameters& params,
const std::string& device_id,
pa_stream_notify_cb_t stream_callback,
void* user_data);
// Create a playback stream for the threaded mainloop, return true if success,
// otherwise false. This function will create a new Pulse threaded mainloop,
// and the handles of the mainloop, context and stream will be returned by
// |mainloop|, |context| and |stream|.
bool CreateOutputStream(pa_threaded_mainloop** mainloop,
pa_context** context,
pa_stream** stream,
const AudioParameters& params,
const std::string& device_id,
const std::string& app_name,
pa_stream_notify_cb_t stream_callback,
pa_stream_request_cb_t write_callback,
void* user_data);
} // namespace pulse
} // namespace media
#endif // MEDIA_AUDIO_PULSE_PULSE_UTIL_H_