Aegisub/aegisub/audio_player_alsa.h

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// Copyright (c) 2007, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:jiifurusu@gmail.com
//
#ifdef WITH_ALSA
///////////
// Headers
#include <wx/wxprec.h>
#include "audio_player.h"
#include "audio_provider.h"
#include "utils.h"
#include "main.h"
#include "frame_main.h"
#include "audio_player.h"
#include <alsa/asoundlib.h>
#include "options.h"
///////////////
// Alsa player
class AlsaPlayer : public AudioPlayer {
private:
bool open;
volatile bool playing;
volatile float volume;
volatile unsigned long start_frame; // first frame of playback
volatile unsigned long cur_frame; // last written frame + 1
volatile unsigned long end_frame; // last frame to play
unsigned long bpf; // bytes per frame
AudioProvider *provider;
snd_pcm_t *pcm_handle; // device handle
snd_pcm_stream_t stream; // stream direction
snd_async_handler_t *pcm_callback;
snd_pcm_format_t sample_format;
unsigned int rate; // sample rate of audio
unsigned int real_rate; // actual sample rate played back
unsigned int period_len; // length of period in microseconds
unsigned int buflen; // length of buffer in microseconds
snd_pcm_uframes_t period; // size of period in frames
snd_pcm_uframes_t bufsize; // size of buffer in frames
void SetUpHardware();
void SetUpAsync();
static void async_write_handler(snd_async_handler_t *pcm_callback);
public:
AlsaPlayer();
~AlsaPlayer();
void OpenStream();
void CloseStream();
void Play(int64_t start,int64_t count);
void Stop(bool timerToo=true);
bool IsPlaying();
int64_t GetStartPosition();
int64_t GetEndPosition();
int64_t GetCurrentPosition();
void SetEndPosition(int64_t pos);
void SetCurrentPosition(int64_t pos);
void SetVolume(double vol) { volume = vol; }
double GetVolume() { return volume; }
};
///////////
// Factory
class AlsaPlayerFactory : public AudioPlayerFactory {
public:
AudioPlayer *CreatePlayer() { return new AlsaPlayer(); }
AlsaPlayerFactory() : AudioPlayerFactory(_T("alsa")) {}
};
#endif