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: ");
38 StreamSoundSource::~StreamSoundSource()
42 alDeleteBuffers(STREAMFRAGMENTS, buffers);
43 SoundManager::check_al_error("Couldn't delete audio buffers: ");
47 StreamSoundSource::set_sound_file(SoundFile* newfile)
53 alGetSourcei(source, AL_BUFFERS_QUEUED, &queued);
54 for(size_t i = 0; i < STREAMFRAGMENTS - queued; ++i) {
55 if(fillBufferAndQueue(buffers[i]) == false)
61 StreamSoundSource::update()
64 alGetSourcei(source, AL_BUFFERS_PROCESSED, &processed);
65 for(ALint i = 0; i < processed; ++i) {
67 alSourceUnqueueBuffers(source, 1, &buffer);
68 SoundManager::check_al_error("Couldn't unqueu audio buffer: ");
70 if(fillBufferAndQueue(buffer) == false)
75 if(processed == 0 || !looping)
78 // we might have to restart the source if we had a buffer underrun
79 log_info << "Restarting audio source because of buffer underrun" << std::endl;
83 if(fade_state == FadingOn) {
84 float time = real_time - fade_start_time;
85 if(time >= fade_time) {
87 fade_state = NoFading;
89 set_gain(time / fade_time);
91 } else if(fade_state == FadingOff) {
92 float time = real_time - fade_start_time;
93 if(time >= fade_time) {
95 fade_state = NoFading;
97 set_gain( (fade_time-time) / fade_time);
103 StreamSoundSource::set_fading(FadeState state, float fade_time)
105 this->fade_state = state;
106 this->fade_time = fade_time;
107 this->fade_start_time = real_time;
111 StreamSoundSource::fillBufferAndQueue(ALuint buffer)
114 char* bufferdata = new char[STREAMFRAGMENTSIZE];
115 size_t bytesread = 0;
117 bytesread += file->read(bufferdata + bytesread,
118 STREAMFRAGMENTSIZE - bytesread);
120 if(bytesread < STREAMFRAGMENTSIZE) {
126 } while(bytesread < STREAMFRAGMENTSIZE);
129 ALenum format = SoundManager::get_sample_format(file);
130 alBufferData(buffer, format, bufferdata, bytesread, file->rate);
132 SoundManager::check_al_error("Couldn't refill audio buffer: ");
134 alSourceQueueBuffers(source, 1, &buffer);
135 SoundManager::check_al_error("Couldn't queue audio buffer: ");
138 // return false if there aren't more buffers to fill
139 return bytesread >= STREAMFRAGMENTSIZE;