Aegisub/src/audio_player_openal.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 Project http://www.aegisub.org/
/// @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
#include <vector>
#include <wx/timer.h>
class OpenALPlayer : public AudioPlayer, wxTimer {
/// Number of OpenAL buffers to use
static const ALsizei num_buffers = 8;
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bool playing = false; ///< Is audio currently playing?
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float volume = 1.f; ///< Current audio volume
ALsizei samplerate; ///< Sample rate of the audio
int bpf; ///< Bytes per frame
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int64_t start_frame = 0; ///< First frame of playbacka
int64_t cur_frame = 0; ///< Next frame to write to playback buffers
int64_t end_frame = 0; ///< Last frame to play
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ALCdevice *device = nullptr; ///< OpenAL device handle
ALCcontext *context = nullptr; ///< OpenAL sound context
ALuint buffers[num_buffers]; ///< OpenAL sound buffers
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ALuint source = 0; ///< OpenAL playback source
/// Index into buffers, first free (unqueued) buffer to be filled
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ALsizei buf_first_free = 0;
/// Index into buffers, first queued (non-free) buffer
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ALsizei buf_first_queued = 0;
/// Number of free buffers
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ALsizei buffers_free = 0;
/// Number of buffers which have been fully played since playback was last started
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ALsizei buffers_played = 0;
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
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void Notify() override;
public:
OpenALPlayer(AudioProvider *provider);
~OpenALPlayer();
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void Play(int64_t start,int64_t count) override;
void Stop() override;
bool IsPlaying() override { return playing; }
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int64_t GetEndPosition() override { return end_frame; }
int64_t GetCurrentPosition() override;
void SetEndPosition(int64_t pos) override;
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void SetVolume(double vol) override { volume = vol; }
};
#endif