view Alc/backends/send.c @ 14:63312ec4a2bf

limit to 16bit mono for now.
author Robert McIntyre <rlm@mit.edu>
date Mon, 31 Oct 2011 08:01:08 -0700
parents 92b416b4e027
children 19ff95c69cf5
line wrap: on
line source
1 #include "config.h"
2 #include <stdlib.h>
3 #include "alMain.h"
4 #include "AL/al.h"
5 #include "AL/alc.h"
6 #include "alSource.h"
7 #include <jni.h>
9 //////////////////// Summary
11 struct send_data;
12 struct context_data;
14 static void addContext(ALCdevice *, ALCcontext *);
15 static void syncContexts(ALCcontext *master, ALCcontext *slave);
16 static void syncSources(ALsource *master, ALsource *slave,
17 ALCcontext *masterCtx, ALCcontext *slaveCtx);
19 static void syncSourcei(ALuint master, ALuint slave,
20 ALCcontext *masterCtx, ALCcontext *ctx2, ALenum param);
21 static void syncSourcef(ALuint master, ALuint slave,
22 ALCcontext *masterCtx, ALCcontext *ctx2, ALenum param);
23 static void syncSource3f(ALuint master, ALuint slave,
24 ALCcontext *masterCtx, ALCcontext *ctx2, ALenum param);
26 static void swapInContext(ALCdevice *, struct context_data *);
27 static void saveContext(ALCdevice *, struct context_data *);
28 static void limitContext(ALCdevice *, ALCcontext *);
29 static void unLimitContext(ALCdevice *);
31 static void init(ALCdevice *);
32 static void renderData(ALCdevice *, int samples);
34 #define UNUSED(x) (void)(x)
36 //////////////////// State
38 typedef struct context_data {
39 ALfloat ClickRemoval[MAXCHANNELS];
40 ALfloat PendingClicks[MAXCHANNELS];
41 ALvoid *renderBuffer;
42 ALCcontext *ctx;
43 } context_data;
45 typedef struct send_data {
46 ALuint size;
47 context_data **contexts;
48 ALuint numContexts;
49 ALuint maxContexts;
50 } send_data;
54 //////////////////// Context Creation / Synchronization
56 #define _MAKE_SYNC(NAME, INIT_EXPR, GET_EXPR, SET_EXPR) \
57 void NAME (ALuint sourceID1, ALuint sourceID2, \
58 ALCcontext *ctx1, ALCcontext *ctx2, \
59 ALenum param){ \
60 INIT_EXPR; \
61 ALCcontext *current = alcGetCurrentContext(); \
62 alcMakeContextCurrent(ctx1); \
63 GET_EXPR; \
64 alcMakeContextCurrent(ctx2); \
65 SET_EXPR; \
66 alcMakeContextCurrent(current); \
67 }
69 #define MAKE_SYNC(NAME, TYPE, GET, SET) \
70 _MAKE_SYNC(NAME, \
71 TYPE value, \
72 GET(sourceID1, param, &value), \
73 SET(sourceID2, param, value))
75 #define MAKE_SYNC3(NAME, TYPE, GET, SET) \
76 _MAKE_SYNC(NAME, \
77 TYPE value1; TYPE value2; TYPE value3;, \
78 GET(sourceID1, param, &value1, &value2, &value3), \
79 SET(sourceID2, param, value1, value2, value3))
81 MAKE_SYNC( syncSourcei, ALint, alGetSourcei, alSourcei);
82 MAKE_SYNC( syncSourcef, ALfloat, alGetSourcef, alSourcef);
83 MAKE_SYNC3(syncSource3i, ALint, alGetSource3i, alSource3i);
84 MAKE_SYNC3(syncSource3f, ALfloat, alGetSource3f, alSource3f);
86 void syncSources(ALsource *masterSource, ALsource *slaveSource,
87 ALCcontext *masterCtx, ALCcontext *slaveCtx){
88 ALuint master = masterSource->source;
89 ALuint slave = slaveSource->source;
90 ALCcontext *current = alcGetCurrentContext();
92 syncSourcef(master,slave,masterCtx,slaveCtx,AL_PITCH);
93 syncSourcef(master,slave,masterCtx,slaveCtx,AL_GAIN);
94 syncSourcef(master,slave,masterCtx,slaveCtx,AL_MAX_DISTANCE);
95 syncSourcef(master,slave,masterCtx,slaveCtx,AL_ROLLOFF_FACTOR);
96 syncSourcef(master,slave,masterCtx,slaveCtx,AL_REFERENCE_DISTANCE);
97 syncSourcef(master,slave,masterCtx,slaveCtx,AL_MIN_GAIN);
98 syncSourcef(master,slave,masterCtx,slaveCtx,AL_MAX_GAIN);
99 syncSourcef(master,slave,masterCtx,slaveCtx,AL_CONE_OUTER_GAIN);
100 syncSourcef(master,slave,masterCtx,slaveCtx,AL_CONE_INNER_ANGLE);
101 syncSourcef(master,slave,masterCtx,slaveCtx,AL_CONE_OUTER_ANGLE);
102 syncSourcef(master,slave,masterCtx,slaveCtx,AL_SEC_OFFSET);
103 syncSourcef(master,slave,masterCtx,slaveCtx,AL_SAMPLE_OFFSET);
104 syncSourcef(master,slave,masterCtx,slaveCtx,AL_BYTE_OFFSET);
106 syncSource3f(master,slave,masterCtx,slaveCtx,AL_POSITION);
107 syncSource3f(master,slave,masterCtx,slaveCtx,AL_VELOCITY);
108 syncSource3f(master,slave,masterCtx,slaveCtx,AL_DIRECTION);
110 syncSourcei(master,slave,masterCtx,slaveCtx,AL_SOURCE_RELATIVE);
111 syncSourcei(master,slave,masterCtx,slaveCtx,AL_LOOPING);
113 alcMakeContextCurrent(masterCtx);
114 ALint source_type;
115 alGetSourcei(master, AL_SOURCE_TYPE, &source_type);
117 // Only static sources are currently synchronized!
118 if (AL_STATIC == source_type){
119 ALint master_buffer;
120 ALint slave_buffer;
121 alGetSourcei(master, AL_BUFFER, &master_buffer);
122 alcMakeContextCurrent(slaveCtx);
123 alGetSourcei(slave, AL_BUFFER, &slave_buffer);
124 if (master_buffer != slave_buffer){
125 alSourcei(slave, AL_BUFFER, master_buffer);
126 }
127 }
129 // Synchronize the state of the two sources.
130 alcMakeContextCurrent(masterCtx);
131 ALint masterState;
132 ALint slaveState;
134 alGetSourcei(master, AL_SOURCE_STATE, &masterState);
135 alcMakeContextCurrent(slaveCtx);
136 alGetSourcei(slave, AL_SOURCE_STATE, &slaveState);
138 if (masterState != slaveState){
139 switch (masterState){
140 case AL_INITIAL : alSourceRewind(slave); break;
141 case AL_PLAYING : alSourcePlay(slave); break;
142 case AL_PAUSED : alSourcePause(slave); break;
143 case AL_STOPPED : alSourceStop(slave); break;
144 }
145 }
146 // Restore whatever context was previously active.
147 alcMakeContextCurrent(current);
148 }
151 void syncContexts(ALCcontext *master, ALCcontext *slave){
152 /* If there aren't sufficient sources in slave to mirror
153 the sources in master, create them. */
154 ALCcontext *current = alcGetCurrentContext();
156 UIntMap *masterSourceMap = &(master->SourceMap);
157 UIntMap *slaveSourceMap = &(slave->SourceMap);
158 ALuint numMasterSources = masterSourceMap->size;
159 ALuint numSlaveSources = slaveSourceMap->size;
161 alcMakeContextCurrent(slave);
162 if (numSlaveSources < numMasterSources){
163 ALuint numMissingSources = numMasterSources - numSlaveSources;
164 ALuint newSources[numMissingSources];
165 alGenSources(numMissingSources, newSources);
166 }
168 /* Now, slave is gauranteed to have at least as many sources
169 as master. Sync each source from master to the corresponding
170 source in slave. */
171 int i;
172 for(i = 0; i < masterSourceMap->size; i++){
173 syncSources((ALsource*)masterSourceMap->array[i].value,
174 (ALsource*)slaveSourceMap->array[i].value,
175 master, slave);
176 }
177 alcMakeContextCurrent(current);
178 }
180 static void addContext(ALCdevice *Device, ALCcontext *context){
181 send_data *data = (send_data*)Device->ExtraData;
182 // expand array if necessary
183 if (data->numContexts >= data->maxContexts){
184 ALuint newMaxContexts = data->maxContexts*2 + 1;
185 data->contexts = realloc(data->contexts, newMaxContexts*sizeof(context_data));
186 data->maxContexts = newMaxContexts;
187 }
188 // create context_data and add it to the main array
189 context_data *ctxData;
190 ctxData = (context_data*)calloc(1, sizeof(*ctxData));
191 ctxData->renderBuffer =
192 malloc(BytesFromDevFmt(Device->FmtType) *
193 Device->NumChan * Device->UpdateSize);
194 ctxData->ctx = context;
196 data->contexts[data->numContexts] = ctxData;
197 data->numContexts++;
198 }
201 //////////////////// Context Switching
203 /* A device brings along with it two pieces of state
204 * which have to be swapped in and out with each context.
205 */
206 static void swapInContext(ALCdevice *Device, context_data *ctxData){
207 memcpy(Device->ClickRemoval, ctxData->ClickRemoval, sizeof(ALfloat)*MAXCHANNELS);
208 memcpy(Device->PendingClicks, ctxData->PendingClicks, sizeof(ALfloat)*MAXCHANNELS);
209 }
211 static void saveContext(ALCdevice *Device, context_data *ctxData){
212 memcpy(ctxData->ClickRemoval, Device->ClickRemoval, sizeof(ALfloat)*MAXCHANNELS);
213 memcpy(ctxData->PendingClicks, Device->PendingClicks, sizeof(ALfloat)*MAXCHANNELS);
214 }
216 static ALCcontext **currentContext;
217 static ALuint currentNumContext;
219 /* By default, all contexts are rendered at once for each call to aluMixData.
220 * This function uses the internals of the ALCdecice struct to temporarly
221 * cause aluMixData to only render the chosen context.
222 */
223 static void limitContext(ALCdevice *Device, ALCcontext *ctx){
224 currentContext = Device->Contexts;
225 currentNumContext = Device->NumContexts;
226 Device->Contexts = &ctx;
227 Device->NumContexts = 1;
228 }
230 static void unLimitContext(ALCdevice *Device){
231 Device->Contexts = currentContext;
232 Device->NumContexts = currentNumContext;
233 }
236 //////////////////// Main Device Loop
238 /* Establish the LWJGL context as the main context, which will
239 * be synchronized to all the slave contexts
240 */
241 static void init(ALCdevice *Device){
242 ALCcontext *masterContext = alcGetCurrentContext();
243 addContext(Device, masterContext);
244 }
247 static void renderData(ALCdevice *Device, int samples){
248 if(!Device->Connected){return;}
249 send_data *data = (send_data*)Device->ExtraData;
250 ALCcontext *current = alcGetCurrentContext();
252 ALuint i;
253 for (i = 1; i < data->numContexts; i++){
254 syncContexts(data->contexts[0]->ctx , data->contexts[i]->ctx);
255 }
257 if ((uint) samples > Device->UpdateSize){
258 printf("exceeding internal buffer size; dropping samples\n");
259 printf("requested %d; available %d\n", samples, Device->UpdateSize);
260 samples = (int) Device->UpdateSize;
261 }
263 for (i = 0; i < data->numContexts; i++){
264 context_data *ctxData = data->contexts[i];
265 ALCcontext *ctx = ctxData->ctx;
266 alcMakeContextCurrent(ctx);
267 limitContext(Device, ctx);
268 swapInContext(Device, ctxData);
269 aluMixData(Device, ctxData->renderBuffer, samples);
270 saveContext(Device, ctxData);
271 unLimitContext(Device);
272 }
273 alcMakeContextCurrent(current);
274 }
277 //////////////////// JNI Methods
279 #include "com_aurellem_send_AudioSend.h"
281 /*
282 * Class: com_aurellem_send_AudioSend
283 * Method: nstep
284 * Signature: (JI)V
285 */
286 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_nstep
287 (JNIEnv *env, jclass clazz, jlong device, jint samples){
288 UNUSED(env);UNUSED(clazz);UNUSED(device);
289 renderData((ALCdevice*)((intptr_t)device), samples);
290 }
292 /*
293 * Class: com_aurellem_send_AudioSend
294 * Method: ngetSamples
295 * Signature: (JLjava/nio/ByteBuffer;III)V
296 */
297 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_ngetSamples
298 (JNIEnv *env, jclass clazz, jlong device, jobject buffer, jint position,
299 jint samples, jint n){
300 UNUSED(clazz);
302 ALvoid *buffer_address =
303 ((ALbyte *)(((char*)(*env)->GetDirectBufferAddress(env, buffer)) + position));
304 ALCdevice *recorder = (ALCdevice*) ((intptr_t)device);
305 send_data *data = (send_data*)recorder->ExtraData;
306 if ((ALuint)n > data->numContexts){return;}
307 //if ((uint) samples > data->size){
308 // samples = (int) data->size;
309 //}
310 printf("Want %d samples for listener %d\n", samples, n);
311 printf("Device's format type is %d bytes per sample,\n",
312 BytesFromDevFmt(recorder->FmtType));
313 printf("and it has %d channels, making for %d requested bytes\n",
314 recorder->NumChan,
315 BytesFromDevFmt(recorder->FmtType) * recorder->NumChan * samples);
317 memcpy(buffer_address, data->contexts[n]->renderBuffer,
318 BytesFromDevFmt(recorder->FmtType) * recorder->NumChan * samples);
319 //samples*sizeof(ALfloat));
320 }
322 /*
323 * Class: com_aurellem_send_AudioSend
324 * Method: naddListener
325 * Signature: (J)V
326 */
327 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_naddListener
328 (JNIEnv *env, jclass clazz, jlong device){
329 UNUSED(env); UNUSED(clazz);
330 printf("creating new context via naddListener\n");
331 ALCdevice *Device = (ALCdevice*) ((intptr_t)device);
332 ALCcontext *new = alcCreateContext(Device, NULL);
333 addContext(Device, new);
334 }
336 /*
337 * Class: com_aurellem_send_AudioSend
338 * Method: nsetNthListener3f
339 * Signature: (IFFFJI)V
340 */
341 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_nsetNthListener3f
342 (JNIEnv *env, jclass clazz, jint param,
343 jfloat v1, jfloat v2, jfloat v3, jlong device, jint contextNum){
344 UNUSED(env);UNUSED(clazz);
346 ALCdevice *Device = (ALCdevice*) ((intptr_t)device);
347 send_data *data = (send_data*)Device->ExtraData;
349 ALCcontext *current = alcGetCurrentContext();
350 if ((ALuint)contextNum > data->numContexts){return;}
351 alcMakeContextCurrent(data->contexts[contextNum]->ctx);
352 alListener3f(param, v1, v2, v3);
353 alcMakeContextCurrent(current);
354 }
356 /*
357 * Class: com_aurellem_send_AudioSend
358 * Method: nsetNthListenerf
359 * Signature: (IFJI)V
360 */
361 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_nsetNthListenerf
362 (JNIEnv *env, jclass clazz, jint param, jfloat v1, jlong device,
363 jint contextNum){
365 UNUSED(env);UNUSED(clazz);
367 ALCdevice *Device = (ALCdevice*) ((intptr_t)device);
368 send_data *data = (send_data*)Device->ExtraData;
370 ALCcontext *current = alcGetCurrentContext();
371 if ((ALuint)contextNum > data->numContexts){return;}
372 alcMakeContextCurrent(data->contexts[contextNum]->ctx);
373 alListenerf(param, v1);
374 alcMakeContextCurrent(current);
375 }
377 /*
378 * Class: com_aurellem_send_AudioSend
379 * Method: ninitDevice
380 * Signature: (J)V
381 */
382 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_ninitDevice
383 (JNIEnv *env, jclass clazz, jlong device){
384 UNUSED(env);UNUSED(clazz);
386 ALCdevice *Device = (ALCdevice*) ((intptr_t)device);
387 init(Device);
389 }
392 /*
393 * Class: com_aurellem_send_AudioSend
394 * Method: ngetAudioFormat
395 * Signature: (J)Ljavax/sound/sampled/AudioFormat;
396 */
397 JNIEXPORT jobject JNICALL Java_com_aurellem_send_AudioSend_ngetAudioFormat
398 (JNIEnv *env, jclass clazz, jlong device){
399 UNUSED(clazz);
400 jclass AudioFormatClass =
401 (*env)->FindClass(env, "javax/sound/sampled/AudioFormat");
402 jmethodID AudioFormatConstructor =
403 (*env)->GetMethodID(env, AudioFormatClass, "<init>", "(FIIZZ)V");
405 ALCdevice *Device = (ALCdevice*) ((intptr_t)device);
407 //float frequency
409 int isSigned;
410 switch (Device->FmtType)
411 {
412 case DevFmtUByte:
413 case DevFmtUShort: isSigned = 0; break;
414 default : isSigned = 1;
415 }
416 float frequency = Device->Frequency;
417 int bitsPerFrame = (8 * BytesFromDevFmt(Device->FmtType));
418 int channels = Device->NumChan;
421 printf("freq = %f, bpf = %d, channels = %d, signed? = %d\n",
422 frequency, bitsPerFrame, channels, isSigned);
424 jobject format = (*env)->
425 NewObject(
426 env,AudioFormatClass,AudioFormatConstructor,
427 frequency,
428 bitsPerFrame,
429 channels,
430 isSigned,
431 0);
432 return format;
433 }
437 //////////////////// Device Initilization / Management
439 static const ALCchar sendDevice[] = "Multiple Audio Send";
441 static ALCboolean send_open_playback(ALCdevice *device,
442 const ALCchar *deviceName)
443 {
444 send_data *data;
445 // stop any buffering for stdout, so that I can
446 // see the printf statements in my terminal immediatley
447 setbuf(stdout, NULL);
449 if(!deviceName)
450 deviceName = sendDevice;
451 else if(strcmp(deviceName, sendDevice) != 0)
452 return ALC_FALSE;
453 data = (send_data*)calloc(1, sizeof(*data));
454 device->szDeviceName = strdup(deviceName);
455 device->ExtraData = data;
456 return ALC_TRUE;
457 }
459 static void send_close_playback(ALCdevice *device)
460 {
461 send_data *data = (send_data*)device->ExtraData;
462 alcMakeContextCurrent(NULL);
463 ALuint i;
464 // Destroy all slave contexts. LWJGL will take care of
465 // its own context.
466 for (i = 1; i < data->numContexts; i++){
467 context_data *ctxData = data->contexts[i];
468 alcDestroyContext(ctxData->ctx);
469 free(ctxData->renderBuffer);
470 free(ctxData);
471 }
472 free(data);
473 device->ExtraData = NULL;
474 }
476 static ALCboolean send_reset_playback(ALCdevice *device)
477 {
478 SetDefaultWFXChannelOrder(device);
479 return ALC_TRUE;
480 }
482 static void send_stop_playback(ALCdevice *Device){
483 UNUSED(Device);
484 }
486 static const BackendFuncs send_funcs = {
487 send_open_playback,
488 send_close_playback,
489 send_reset_playback,
490 send_stop_playback,
491 NULL,
492 NULL, /* These would be filled with functions to */
493 NULL, /* handle capturing audio if we we into that */
494 NULL, /* sort of thing... */
495 NULL,
496 NULL
497 };
499 ALCboolean alc_send_init(BackendFuncs *func_list){
500 *func_list = send_funcs;
501 return ALC_TRUE;
502 }
504 void alc_send_deinit(void){}
506 void alc_send_probe(enum DevProbe type)
507 {
508 switch(type)
509 {
510 case DEVICE_PROBE:
511 AppendDeviceList(sendDevice);
512 break;
513 case ALL_DEVICE_PROBE:
514 AppendAllDeviceList(sendDevice);
515 break;
516 case CAPTURE_DEVICE_PROBE:
517 break;
518 }
519 }