4 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
6 // This program is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU General Public License
8 // as published by the Free Software Foundation; either version 2
9 // of the License, or (at your option) any later version.
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include "stream_sound_source.hpp"
26 #include "sound_manager.hpp"
27 #include "sound_file.hpp"
31 StreamSoundSource::StreamSoundSource()
32 : file(0), fade_state(NoFading), looping(false)
34 alGenBuffers(STREAMFRAGMENTS, buffers);
35 SoundManager::check_al_error("Couldn't allocate audio buffers: ");
36 //add me to update list
37 sound_manager->register_for_update( this );
40 StreamSoundSource::~StreamSoundSource()
42 //don't update me any longer
43 sound_manager->remove_from_update( this );
46 alDeleteBuffers(STREAMFRAGMENTS, buffers);
47 SoundManager::check_al_error("Couldn't delete audio buffers: ");
51 StreamSoundSource::set_sound_file(SoundFile* newfile)
57 alGetSourcei(source, AL_BUFFERS_QUEUED, &queued);
58 for(size_t i = 0; i < STREAMFRAGMENTS - queued; ++i) {
59 if(fillBufferAndQueue(buffers[i]) == false)
65 StreamSoundSource::update()
68 alGetSourcei(source, AL_BUFFERS_PROCESSED, &processed);
69 for(ALint i = 0; i < processed; ++i) {
71 alSourceUnqueueBuffers(source, 1, &buffer);
72 SoundManager::check_al_error("Couldn't unqueu audio buffer: ");
74 if(fillBufferAndQueue(buffer) == false)
79 if(processed == 0 || !looping)
82 // we might have to restart the source if we had a buffer underrun
83 log_info << "Restarting audio source because of buffer underrun" << std::endl;
87 if(fade_state == FadingOn) {
88 float time = real_time - fade_start_time;
89 if(time >= fade_time) {
91 fade_state = NoFading;
93 set_gain(time / fade_time);
95 } else if(fade_state == FadingOff) {
96 float time = real_time - fade_start_time;
97 if(time >= fade_time) {
99 fade_state = NoFading;
101 set_gain( (fade_time-time) / fade_time);
107 StreamSoundSource::set_fading(FadeState state, float fade_time)
109 this->fade_state = state;
110 this->fade_time = fade_time;
111 this->fade_start_time = real_time;
115 StreamSoundSource::fillBufferAndQueue(ALuint buffer)
118 char* bufferdata = new char[STREAMFRAGMENTSIZE];
119 size_t bytesread = 0;
121 bytesread += file->read(bufferdata + bytesread,
122 STREAMFRAGMENTSIZE - bytesread);
124 if(bytesread < STREAMFRAGMENTSIZE) {
130 } while(bytesread < STREAMFRAGMENTSIZE);
133 ALenum format = SoundManager::get_sample_format(file);
134 alBufferData(buffer, format, bufferdata, bytesread, file->rate);
135 SoundManager::check_al_error("Couldn't refill audio buffer: ");
137 alSourceQueueBuffers(source, 1, &buffer);
138 SoundManager::check_al_error("Couldn't queue audio buffer: ");
142 // return false if there aren't more buffers to fill
143 return bytesread >= STREAMFRAGMENTSIZE;