OpenAL audio player that at least "somewhat works" on Windows.
Originally committed to SVN as r1173.
This commit is contained in:
Niels Martin Hansen
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commit
f7893b932e
1 changed files with 388 additions and 0 deletions
388
aegisub/audio_player_openal.cpp
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388
aegisub/audio_player_openal.cpp
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// Copyright (c) 2007, Niels Martin Hansen
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// -----------------------------------------------------------------------------
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//
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// AEGISUB
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//
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// Website: http://aegisub.cellosoft.com
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// Contact: mailto:jiifurusu@gmail.com
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//
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///////////
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// Headers
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#include <wx/wxprec.h>
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#include "audio_player.h"
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#include "audio_provider.h"
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#include "utils.h"
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#include "main.h"
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#include "frame_main.h"
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#include "audio_player.h"
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#include "options.h"
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#include <al.h>
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#include <alc.h>
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// Auto-link to OpenAL lib for MSVC
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#ifdef _MSC_VER
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#pragma comment(lib, "openal32.lib")
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#endif
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/////////////////
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// OpenAL player
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class OpenALPlayer : public AudioPlayer, wxTimer {
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private:
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bool open;
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volatile bool playing;
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volatile float volume;
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static const ALsizei num_buffers = 8;
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ALsizei buffer_length;
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ALsizei samplerate;
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volatile unsigned long start_frame; // first frame of playback
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volatile unsigned long cur_frame; // last written frame + 1
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volatile unsigned long end_frame; // last frame to play
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unsigned long bpf; // bytes per frame
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AudioProvider *provider;
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ALCdevice *device; // device handle
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ALCcontext *context; // sound context
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ALuint buffers[num_buffers]; // sound buffers
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ALuint source; // playback source
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ALsizei buf_first_free; // index into buffers, first free (unqueued) buffer
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ALsizei buf_first_queued; // index into buffers, first queued (non-free) buffer
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ALsizei buffers_free; // number of free buffers
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ALsizei buffers_played;
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void FillBuffers(ALsizei count);
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protected:
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void Notify(); // from wxTimer
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public:
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OpenALPlayer();
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~OpenALPlayer();
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void OpenStream();
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void CloseStream();
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void Play(__int64 start,__int64 count);
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void Stop(bool timerToo=true);
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bool IsPlaying();
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__int64 GetStartPosition();
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__int64 GetEndPosition();
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__int64 GetCurrentPosition();
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void SetEndPosition(__int64 pos);
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void SetCurrentPosition(__int64 pos);
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void SetVolume(double vol) { volume = vol; }
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double GetVolume() { return volume; }
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};
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///////////
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// Factory
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class OpenALPlayerFactory : public AudioPlayerFactory {
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public:
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AudioPlayer *CreatePlayer() { return new OpenALPlayer(); }
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OpenALPlayerFactory() : AudioPlayerFactory(_T("openal")) {}
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} registerOALPlayer;
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///////////////
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// Constructor
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OpenALPlayer::OpenALPlayer()
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{
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volume = 1.0f;
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open = false;
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playing = false;
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start_frame = cur_frame = end_frame = bpf = 0;
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provider = 0;
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}
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//////////////
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// Destructor
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OpenALPlayer::~OpenALPlayer()
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{
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CloseStream();
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}
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///////////////
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// Open stream
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void OpenALPlayer::OpenStream()
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{
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CloseStream();
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// Get provider
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provider = GetProvider();
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bpf = provider->GetChannels() * provider->GetBytesPerSample();
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// Open device
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device = alcOpenDevice(0);
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if (!device) {
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throw _T("Failed opening default OpenAL device");
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}
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// Create context
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context = alcCreateContext(device, 0);
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if (!context) {
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alcCloseDevice(device);
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throw _T("Failed creating OpenAL context");
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}
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if (!alcMakeContextCurrent(context)) {
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alcDestroyContext(context);
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alcCloseDevice(device);
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throw _T("Failed selecting OpenAL context");
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}
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// Clear error code
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alGetError();
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// Generate buffers
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alGenBuffers(num_buffers, buffers);
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if (alGetError() != AL_NO_ERROR) {
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alcDestroyContext(context);
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alcCloseDevice(device);
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throw _T("Error generating OpenAL buffers");
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}
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// Generate source
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alGenSources(1, &source);
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if (alGetError() != AL_NO_ERROR) {
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alDeleteBuffers(num_buffers, buffers);
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alcDestroyContext(context);
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alcCloseDevice(device);
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throw _T("Error generating OpenAL source");
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}
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// Determine buffer length
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samplerate = provider->GetSampleRate();
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buffer_length = samplerate * 2 / num_buffers; // buffers for two seconds of audio
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// Now ready
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open = true;
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}
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////////////////
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// Close stream
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void OpenALPlayer::CloseStream()
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{
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if (!open) return;
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Stop();
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alDeleteSources(1, &source);
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alDeleteBuffers(num_buffers, buffers);
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alcDestroyContext(context);
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alcCloseDevice(device);
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// No longer working
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open = false;
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}
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////////
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// Play
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void OpenALPlayer::Play(__int64 start,__int64 count)
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{
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if (playing) {
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// Quick reset
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playing = false;
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alSourceStop(source);
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alSourcei(source, AL_BUFFER, 0);
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}
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// Set params
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start_frame = start;
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cur_frame = start;
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end_frame = start + count;
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playing = true;
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// Prepare buffers
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buffers_free = num_buffers;
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buffers_played = 0;
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buf_first_free = 0;
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buf_first_queued = 0;
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FillBuffers(num_buffers);
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// And go!
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alSourcePlay(source);
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wxTimer::Start(100);
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// Update timer
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if (displayTimer && !displayTimer->IsRunning()) displayTimer->Start(15);
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}
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////////
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// Stop
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void OpenALPlayer::Stop(bool timerToo)
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{
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if (!open) return;
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if (!playing) return;
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// Reset data
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wxTimer::Stop();
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playing = false;
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start_frame = 0;
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cur_frame = 0;
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end_frame = 0;
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// Then drop the playback
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alSourceStop(source);
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alSourcei(source, AL_BUFFER, 0);
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if (timerToo && displayTimer) {
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displayTimer->Stop();
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}
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}
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void OpenALPlayer::FillBuffers(ALsizei count)
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{
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wxLogDebug(_T("FillBuffers: count=%d, buffers_free=%d"), count, buffers_free);
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if (count > buffers_free) count = buffers_free;
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if (count < 1) count = 1;
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// Get memory to hold sound buffers
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void *data = malloc(buffer_length * bpf);
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// Do the actual filling/queueing
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ALuint bufid = buf_first_free;
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while (count > 0) {
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ALsizei fill_len = buffer_length;
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if (fill_len > end_frame - cur_frame) fill_len = end_frame - cur_frame;
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wxLogDebug(_T("buffer_length=%d, fill_len=%d, end_frame-cur_frame=%d"), buffer_length, fill_len, end_frame-cur_frame);
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if (fill_len > 0)
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// Get fill_len frames of audio
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provider->GetAudioWithVolume(data, cur_frame, fill_len, volume);
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if (fill_len < buffer_length)
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// And zerofill the rest
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memset((char*)data+(fill_len*bpf), 0, (buffer_length-fill_len)*bpf);
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cur_frame += fill_len;
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alBufferData(buffers[bufid], AL_FORMAT_MONO16, data, buffer_length*bpf, samplerate);
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alSourceQueueBuffers(source, 1, &buffers[bufid]); // FIXME: collect buffer handles and queue all at once instead of one at a time?
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if (++bufid >= num_buffers) bufid = 0;
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count--; buffers_free--;
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}
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buf_first_free = bufid;
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// Free buffer memory again
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free(data);
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}
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void OpenALPlayer::Notify()
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{
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ALsizei newplayed;
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alGetSourcei(source, AL_BUFFERS_PROCESSED, &newplayed);
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wxLogDebug(_T("OpenAL Player notify: buffers_played=%d, newplayed=%d, playeddiff=%d"), buffers_played, newplayed);
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if (newplayed > 0) {
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// Reclaim buffers
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ALuint *bufs = new ALuint[newplayed];
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ALsizei i = 0;
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while (i < newplayed) {
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bufs[i++] = buffers[buf_first_queued];
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if (++buf_first_queued >= num_buffers) buf_first_queued = 0;
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}
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alSourceUnqueueBuffers(source, newplayed, bufs);
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delete[] bufs;
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buffers_free += newplayed;
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// Update
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buffers_played += newplayed;
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// Fill more buffers
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FillBuffers(newplayed);
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}
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wxLogDebug(_T("frames played=%d, num frames=%d"), (buffers_played - num_buffers) * buffer_length, end_frame - start_frame);
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if ((buffers_played - num_buffers) * buffer_length > (ALsizei)(end_frame - start_frame)) {
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Stop(true);
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}
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}
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bool OpenALPlayer::IsPlaying()
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{
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return playing;
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}
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///////////
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// Set end
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void OpenALPlayer::SetEndPosition(__int64 pos)
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{
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end_frame = pos;
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}
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////////////////////////
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// Set current position
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void OpenALPlayer::SetCurrentPosition(__int64 pos)
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{
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cur_frame = pos;
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}
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__int64 OpenALPlayer::GetStartPosition()
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{
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return start_frame;
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}
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__int64 OpenALPlayer::GetEndPosition()
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{
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return end_frame;
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}
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////////////////////////
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// Get current position
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__int64 OpenALPlayer::GetCurrentPosition()
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{
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//snd_pcm_sframes_t delay = 0;
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//snd_pcm_delay(pcm_handle, &delay); // don't bother catching errors here
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//return cur_frame - delay;
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return buffers_played * buffer_length;
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}
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