1 /*
2 * OpenAL audio output driver for MPlayer
3 *
4 * Copyleft 2006 by Reimar Döffinger (Reimar.Doeffinger@stud.uni-karlsruhe.de)
5 *
6 * This file is part of MPlayer.
7 *
8 * MPlayer is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * MPlayer is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * along with MPlayer; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "config.h"
24
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <inttypes.h>
28 #ifdef OPENAL_AL_H
29 #include <OpenAL/alc.h>
30 #include <OpenAL/al.h>
31 #else
32 #include <AL/alc.h>
33 #include <AL/al.h>
34 #endif
35
36 #include "mp_msg.h"
37 #include "help_mp.h"
38
39 #include "audio_out.h"
40 #include "audio_out_internal.h"
41 #include "libaf/af_format.h"
42 #include "osdep/timer.h"
43 #include "subopt-helper.h"
44
45 static const ao_info_t info =
46 {
47 "OpenAL audio output",
48 "openal",
49 "Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>",
50 ""
51 };
52
53 LIBAO_EXTERN(openal)
54
55 #define MAX_CHANS 8
56 #define NUM_BUF 128
57 #define CHUNK_SIZE 512
58 static ALuint buffers[MAX_CHANS][NUM_BUF];
59 static ALuint sources[MAX_CHANS];
60
61 static int cur_buf[MAX_CHANS];
62 static int unqueue_buf[MAX_CHANS];
63 static int16_t *tmpbuf;
64
65
control(int cmd,void * arg)66 static int control(int cmd, void *arg) {
67 switch (cmd) {
68 case AOCONTROL_GET_VOLUME:
69 case AOCONTROL_SET_VOLUME: {
70 ALfloat volume;
71 ao_control_vol_t *vol = (ao_control_vol_t *)arg;
72 if (cmd == AOCONTROL_SET_VOLUME) {
73 volume = (vol->left + vol->right) / 200.0;
74 alListenerf(AL_GAIN, volume);
75 }
76 alGetListenerf(AL_GAIN, &volume);
77 vol->left = vol->right = volume * 100;
78 return CONTROL_TRUE;
79 }
80 }
81 return CONTROL_UNKNOWN;
82 }
83
84 /**
85 * \brief print suboption usage help
86 */
print_help(void)87 static void print_help(void) {
88 mp_msg(MSGT_AO, MSGL_FATAL,
89 "\n-ao openal commandline help:\n"
90 "Example: mplayer -ao openal\n"
91 "\nOptions:\n"
92 );
93 }
94
init(int rate,int channels,int format,int flags)95 static int init(int rate, int channels, int format, int flags) {
96 float position[3] = {0, 0, 0};
97 float direction[6] = {0, 0, 1, 0, -1, 0};
98 float sppos[MAX_CHANS][3] = {
99 {-1, 0, 0.5}, {1, 0, 0.5},
100 {-1, 0, -1}, {1, 0, -1},
101 {0, 0, 1}, {0, 0, 0.1},
102 {-1, 0, 0}, {1, 0, 0},
103 };
104 ALCdevice *dev = NULL;
105 ALCcontext *ctx = NULL;
106 ALCint freq = 0;
107 ALCint attribs[] = {ALC_FREQUENCY, rate, 0, 0};
108 int i;
109 const opt_t subopts[] = {
110 {NULL}
111 };
112 if (subopt_parse(ao_subdevice, subopts) != 0) {
113 print_help();
114 return 0;
115 }
116 if (channels > MAX_CHANS) {
117 mp_msg(MSGT_AO, MSGL_FATAL, "[OpenAL] Invalid number of channels: %i\n", channels);
118 goto err_out;
119 }
120 dev = alcOpenDevice(NULL);
121 if (!dev) {
122 mp_msg(MSGT_AO, MSGL_FATAL, "[OpenAL] could not open device\n");
123 goto err_out;
124 }
125 ctx = alcCreateContext(dev, attribs);
126 alcMakeContextCurrent(ctx);
127 alListenerfv(AL_POSITION, position);
128 alListenerfv(AL_ORIENTATION, direction);
129 alGenSources(channels, sources);
130 for (i = 0; i < channels; i++) {
131 cur_buf[i] = 0;
132 unqueue_buf[i] = 0;
133 alGenBuffers(NUM_BUF, buffers[i]);
134 alSourcefv(sources[i], AL_POSITION, sppos[i]);
135 alSource3f(sources[i], AL_VELOCITY, 0, 0, 0);
136 }
137 if (channels == 1)
138 alSource3f(sources[0], AL_POSITION, 0, 0, 1);
139 ao_data.channels = channels;
140 alcGetIntegerv(dev, ALC_FREQUENCY, 1, &freq);
141 if (alcGetError(dev) == ALC_NO_ERROR && freq)
142 rate = freq;
143 ao_data.samplerate = rate;
144 ao_data.format = AF_FORMAT_S16_NE;
145 ao_data.bps = channels * rate * 2;
146 ao_data.buffersize = CHUNK_SIZE * NUM_BUF;
147 ao_data.outburst = channels * CHUNK_SIZE;
148 tmpbuf = malloc(CHUNK_SIZE);
149 return 1;
150
151 err_out:
152 return 0;
153 }
154
155 // close audio device
uninit(int immed)156 static void uninit(int immed) {
157 ALCcontext *ctx = alcGetCurrentContext();
158 ALCdevice *dev = alcGetContextsDevice(ctx);
159 free(tmpbuf);
160 if (!immed) {
161 ALint state;
162 alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
163 while (state == AL_PLAYING) {
164 usec_sleep(10000);
165 alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
166 }
167 }
168 reset();
169 alcMakeContextCurrent(NULL);
170 alcDestroyContext(ctx);
171 alcCloseDevice(dev);
172 }
173
unqueue_buffers(void)174 static void unqueue_buffers(void) {
175 ALint p;
176 int s;
177 for (s = 0; s < ao_data.channels; s++) {
178 int till_wrap = NUM_BUF - unqueue_buf[s];
179 alGetSourcei(sources[s], AL_BUFFERS_PROCESSED, &p);
180 if (p >= till_wrap) {
181 alSourceUnqueueBuffers(sources[s], till_wrap, &buffers[s][unqueue_buf[s]]);
182 unqueue_buf[s] = 0;
183 p -= till_wrap;
184 }
185 if (p) {
186 alSourceUnqueueBuffers(sources[s], p, &buffers[s][unqueue_buf[s]]);
187 unqueue_buf[s] += p;
188 }
189 }
190 }
191
192 /**
193 * \brief stop playing and empty buffers (for seeking/pause)
194 */
reset(void)195 static void reset(void) {
196 alSourceStopv(ao_data.channels, sources);
197 unqueue_buffers();
198 }
199
200 /**
201 * \brief stop playing, keep buffers (for pause)
202 */
audio_pause(void)203 static void audio_pause(void) {
204 alSourcePausev(ao_data.channels, sources);
205 }
206
207 /**
208 * \brief resume playing, after audio_pause()
209 */
audio_resume(void)210 static void audio_resume(void) {
211 alSourcePlayv(ao_data.channels, sources);
212 }
213
get_space(void)214 static int get_space(void) {
215 ALint queued;
216 unqueue_buffers();
217 alGetSourcei(sources[0], AL_BUFFERS_QUEUED, &queued);
218 queued = NUM_BUF - queued - 3;
219 if (queued < 0) return 0;
220 return queued * CHUNK_SIZE * ao_data.channels;
221 }
222
223 /**
224 * \brief write data into buffer and reset underrun flag
225 */
play(void * data,int len,int flags)226 static int play(void *data, int len, int flags) {
227 ALint state;
228 int i, j, k;
229 int ch;
230 int16_t *d = data;
231 len /= ao_data.channels * CHUNK_SIZE;
232 for (i = 0; i < len; i++) {
233 for (ch = 0; ch < ao_data.channels; ch++) {
234 for (j = 0, k = ch; j < CHUNK_SIZE / 2; j++, k += ao_data.channels)
235 tmpbuf[j] = d[k];
236 alBufferData(buffers[ch][cur_buf[ch]], AL_FORMAT_MONO16, tmpbuf,
237 CHUNK_SIZE, ao_data.samplerate);
238 alSourceQueueBuffers(sources[ch], 1, &buffers[ch][cur_buf[ch]]);
239 cur_buf[ch] = (cur_buf[ch] + 1) % NUM_BUF;
240 }
241 d += ao_data.channels * CHUNK_SIZE / 2;
242 }
243 alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
244 if (state != AL_PLAYING) // checked here in case of an underrun
245 alSourcePlayv(ao_data.channels, sources);
246 return len * ao_data.channels * CHUNK_SIZE;
247 }
248
get_delay(void)249 static float get_delay(void) {
250 ALint queued;
251 unqueue_buffers();
252 alGetSourcei(sources[0], AL_BUFFERS_QUEUED, &queued);
253 return queued * CHUNK_SIZE / 2 / (float)ao_data.samplerate;
254 }
255