Aegisub/aegisub/src/audio_player_openal.h
2012-01-08 01:33:39 +00:00

126 lines
3.8 KiB
C++

// 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 Project http://www.aegisub.org/
//
// $Id$
/// @file audio_player_openal.h
/// @see audio_player_openal.cpp
/// @ingroup audio_output
///
#ifdef WITH_OPENAL
#include "include/aegisub/audio_player.h"
#include "include/aegisub/audio_provider.h"
#ifdef __WINDOWS__
#include <al.h>
#include <alc.h>
#elif defined(__APPLE__)
#include <OpenAL/al.h>
#include <OpenAL/alc.h>
#else
#include <AL/al.h>
#include <AL/alc.h>
#endif
#ifndef AGI_PRE
#include <vector>
#endif
/// DOCME
/// @class OpenALPlayer
/// @brief DOCME
///
/// DOCME
class OpenALPlayer : public AudioPlayer, wxTimer {
/// Number of OpenAL buffers to use
static const ALsizei num_buffers = 8;
bool open; ///< Is the player ready to play?
bool playing; ///< Is audio currently playing?
float volume; ///< Current audio volume
ALsizei samplerate; ///< Sample rate of the audio
int bpf; ///< Bytes per frame
int64_t start_frame; ///< First frame of playbacka
int64_t cur_frame; ///< Next frame to write to playback buffers
int64_t end_frame; ///< Last frame to play
ALCdevice *device; ///< OpenAL device handle
ALCcontext *context; ///< OpenAL sound context
ALuint buffers[num_buffers]; ///< OpenAL sound buffers
ALuint source; ///< OpenAL playback source
/// Index into buffers, first free (unqueued) buffer to be filled
ALsizei buf_first_free;
/// Index into buffers, first queued (non-free) buffer
ALsizei buf_first_queued;
/// Number of free buffers
ALsizei buffers_free;
/// Number of buffers which have been fully played since playback was last started
ALsizei buffers_played;
/// DOCME
wxStopWatch playback_segment_timer;
/// Buffer to decode audio into
std::vector<char> decode_buffer;
/// Fill count OpenAL buffers
void FillBuffers(ALsizei count);
protected:
/// wxTimer override to periodically fill available buffers
void Notify();
public:
OpenALPlayer();
~OpenALPlayer();
void OpenStream();
void CloseStream();
void Play(int64_t start,int64_t count);
void Stop(bool timerToo=true);
bool IsPlaying() { return playing; }
int64_t GetStartPosition() { return start_frame; }
int64_t GetEndPosition() { return end_frame; }
int64_t GetCurrentPosition();
void SetEndPosition(int64_t pos);
void SetCurrentPosition(int64_t pos);
void SetVolume(double vol) { volume = vol; }
double GetVolume() { return volume; }
};
#endif