Mercurial > audio-send

     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>

     8 

     9 //////////////////// Summary

    10 

    11 struct send_data;

    12 struct context_data;

    13 

    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);

    18 

    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);

    25 

    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 *);

    30 

    31 static void init(ALCdevice *);

    32 static void renderData(ALCdevice *, int samples);

    33 

    34 #define UNUSED(x)  (void)(x)

    35 

    36 ////////////////////  State

    37 

    38 typedef struct context_data {

    39   ALfloat ClickRemoval[MAXCHANNELS];

    40   ALfloat PendingClicks[MAXCHANNELS];

    41   ALvoid *renderBuffer;

    42   ALCcontext *ctx;

    43 } context_data;

    44 

    45 typedef struct send_data {

    46   ALuint size;

    47   context_data **contexts;

    48   ALuint numContexts;

    49   ALuint maxContexts;

    50 } send_data;

    51 

    52 

    53 

    54 ////////////////////  Context Creation / Synchronization

    55 

    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   }

    68   

    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))

    74   

    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))

    80 

    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);

    85   

    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();

    91 

    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);

   105     

   106   syncSource3f(master,slave,masterCtx,slaveCtx,AL_POSITION);

   107   syncSource3f(master,slave,masterCtx,slaveCtx,AL_VELOCITY);

   108   syncSource3f(master,slave,masterCtx,slaveCtx,AL_DIRECTION);

   109   

   110   syncSourcei(master,slave,masterCtx,slaveCtx,AL_SOURCE_RELATIVE);

   111   syncSourcei(master,slave,masterCtx,slaveCtx,AL_LOOPING);

   112 

   113   alcMakeContextCurrent(masterCtx);

   114   ALint source_type;

   115   alGetSourcei(master, AL_SOURCE_TYPE, &source_type);

   116 

   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   }

   128   

   129   // Synchronize the state of the two sources.

   130   alcMakeContextCurrent(masterCtx);

   131   ALint masterState;

   132   ALint slaveState;

   133 

   134   alGetSourcei(master, AL_SOURCE_STATE, &masterState);

   135   alcMakeContextCurrent(slaveCtx);

   136   alGetSourcei(slave, AL_SOURCE_STATE, &slaveState);

   137 

   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 }

   149 

   150 

   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();

   155 

   156   UIntMap *masterSourceMap = &(master->SourceMap);

   157   UIntMap *slaveSourceMap = &(slave->SourceMap);

   158   ALuint numMasterSources = masterSourceMap->size;

   159   ALuint numSlaveSources = slaveSourceMap->size;

   160 

   161   alcMakeContextCurrent(slave);

   162   if (numSlaveSources < numMasterSources){

   163     ALuint numMissingSources = numMasterSources - numSlaveSources;

   164     ALuint newSources[numMissingSources];

   165     alGenSources(numMissingSources, newSources);

   166   }

   167 

   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 }

   179 

   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 = malloc(data->size);

   192   ctxData->ctx = context;

   193 

   194   data->contexts[data->numContexts] = ctxData;

   195   data->numContexts++;

   196 }

   197 

   198 

   199 ////////////////////  Context Switching 

   200 

   201 /* A device brings along with it two pieces of state

   202  * which have to be swapped in and out with each context.

   203  */

   204 static void swapInContext(ALCdevice *Device, context_data *ctxData){

   205   memcpy(Device->ClickRemoval, ctxData->ClickRemoval, sizeof(ALfloat)*MAXCHANNELS);

   206   memcpy(Device->PendingClicks, ctxData->PendingClicks, sizeof(ALfloat)*MAXCHANNELS);

   207 }

   208 

   209 static void saveContext(ALCdevice *Device, context_data *ctxData){

   210   memcpy(ctxData->ClickRemoval, Device->ClickRemoval, sizeof(ALfloat)*MAXCHANNELS);

   211   memcpy(ctxData->PendingClicks, Device->PendingClicks, sizeof(ALfloat)*MAXCHANNELS);

   212 }  

   213 

   214 static ALCcontext **currentContext;

   215 static ALuint currentNumContext;

   216 

   217 /* By default, all contexts are rendered at once for each call to aluMixData.

   218  * This function uses the internals of the ALCdecice struct to temporarly 

   219  * cause aluMixData to only render the chosen context.

   220  */

   221 static void limitContext(ALCdevice *Device, ALCcontext *ctx){

   222   currentContext  = Device->Contexts;

   223   currentNumContext  = Device->NumContexts;

   224   Device->Contexts = &ctx;

   225   Device->NumContexts = 1;

   226 }

   227 

   228 static void unLimitContext(ALCdevice *Device){

   229   Device->Contexts = currentContext;

   230   Device->NumContexts = currentNumContext;

   231 }

   232 

   233 

   234 ////////////////////   Main Device Loop

   235 

   236 /* Establish the LWJGL context as the main context, which will

   237  * be synchronized to all the slave contexts

   238  */

   239 static void init(ALCdevice *Device){

   240   ALCcontext *masterContext = alcGetCurrentContext();

   241   addContext(Device, masterContext);

   242 }

   243 

   244 

   245 static void renderData(ALCdevice *Device, int samples){

   246   if(!Device->Connected){return;}

   247   send_data *data = (send_data*)Device->ExtraData;

   248   ALCcontext *current = alcGetCurrentContext();

   249 

   250   ALuint i;

   251   for (i = 1; i < data->numContexts; i++){

   252     syncContexts(data->contexts[0]->ctx , data->contexts[i]->ctx);

   253   }

   254   

   255   if ((uint) samples > Device->UpdateSize){

   256     printf("exceeding internal buffer size; dropping samples\n");

   257     printf("requested %d; available %d\n", samples, Device->UpdateSize);

   258     samples = (int) Device->UpdateSize;

   259   }

   260 

   261   for (i = 0; i < data->numContexts; i++){

   262     context_data *ctxData = data->contexts[i];

   263     ALCcontext *ctx = ctxData->ctx;

   264     alcMakeContextCurrent(ctx);

   265     limitContext(Device, ctx);

   266     swapInContext(Device, ctxData);

   267     aluMixData(Device, ctxData->renderBuffer, samples);

   268     saveContext(Device, ctxData);

   269     unLimitContext(Device);

   270   }

   271   alcMakeContextCurrent(current);

   272 }

   273 

   274 

   275 ////////////////////   JNI Methods

   276 

   277 #include "com_aurellem_send_AudioSend.h"

   278 

   279 /*

   280  * Class:     com_aurellem_send_AudioSend

   281  * Method:    nstep

   282  * Signature: (JI)V

   283  */

   284 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_nstep

   285 (JNIEnv *env, jclass clazz, jlong device, jint samples){

   286   UNUSED(env);UNUSED(clazz);UNUSED(device);

   287   renderData((ALCdevice*)((intptr_t)device), samples);

   288 }

   289 

   290 /*

   291  * Class:     com_aurellem_send_AudioSend

   292  * Method:    ngetSamples

   293  * Signature: (JLjava/nio/ByteBuffer;III)V

   294  */

   295 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_ngetSamples

   296 (JNIEnv *env, jclass clazz, jlong device, jobject buffer, jint position, 

   297  jint samples, jint n){

   298   UNUSED(clazz);  

   299 

   300   ALvoid *buffer_address = 

   301     ((ALbyte *)(((char*)(*env)->GetDirectBufferAddress(env, buffer)) + position));

   302   ALCdevice *recorder = (ALCdevice*) ((intptr_t)device);

   303   send_data *data = (send_data*)recorder->ExtraData;

   304   if ((ALuint)n > data->numContexts){return;}

   305   if ((uint) samples > data->size){

   306     samples = (int) data->size;

   307   }

   308   memcpy(buffer_address, data->contexts[n]->renderBuffer, samples*sizeof(ALfloat));

   309 }

   310 

   311 /*

   312  * Class:     com_aurellem_send_AudioSend

   313  * Method:    naddListener

   314  * Signature: (J)V

   315  */

   316 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_naddListener

   317 (JNIEnv *env, jclass clazz, jlong device){

   318   UNUSED(env); UNUSED(clazz);

   319   printf("creating new context via naddListener\n");

   320   ALCdevice *Device = (ALCdevice*) ((intptr_t)device);

   321   ALCcontext *new = alcCreateContext(Device, NULL);

   322   addContext(Device, new);

   323 }

   324 

   325 /*

   326  * Class:     com_aurellem_send_AudioSend

   327  * Method:    nsetNthListener3f

   328  * Signature: (IFFFJI)V

   329  */

   330 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_nsetNthListener3f

   331   (JNIEnv *env, jclass clazz, jint param, 

   332    jfloat v1, jfloat v2, jfloat v3, jlong device, jint contextNum){

   333   UNUSED(env);UNUSED(clazz);

   334 

   335   ALCdevice *Device = (ALCdevice*) ((intptr_t)device);

   336   send_data *data = (send_data*)Device->ExtraData;

   337   

   338   ALCcontext *current = alcGetCurrentContext();

   339   if ((ALuint)contextNum > data->numContexts){return;}

   340   alcMakeContextCurrent(data->contexts[contextNum]->ctx);

   341   alListener3f(param, v1, v2, v3);

   342   alcMakeContextCurrent(current);

   343 }

   344 

   345 /*

   346  * Class:     com_aurellem_send_AudioSend

   347  * Method:    nsetNthListenerf

   348  * Signature: (IFJI)V

   349  */

   350 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_nsetNthListenerf

   351 (JNIEnv *env, jclass clazz, jint param, jfloat v1, jlong device, 

   352  jint contextNum){

   353 

   354   UNUSED(env);UNUSED(clazz);

   355   

   356   ALCdevice *Device = (ALCdevice*) ((intptr_t)device);

   357   send_data *data = (send_data*)Device->ExtraData;

   358   

   359   ALCcontext *current = alcGetCurrentContext();

   360   if ((ALuint)contextNum > data->numContexts){return;}

   361   alcMakeContextCurrent(data->contexts[contextNum]->ctx);

   362   alListenerf(param, v1);

   363   alcMakeContextCurrent(current);

   364 }

   365 

   366 /*

   367  * Class:     com_aurellem_send_AudioSend

   368  * Method:    ninitDevice

   369  * Signature: (J)V

   370  */                     

   371 JNIEXPORT void JNICALL Java_com_aurellem_send_AudioSend_ninitDevice

   372 (JNIEnv *env, jclass clazz, jlong device){

   373   UNUSED(env);UNUSED(clazz);

   374   

   375   ALCdevice *Device = (ALCdevice*) ((intptr_t)device);

   376   init(Device);

   377 

   378 }

   379 

   380 

   381 ////////////////////   Device Initilization / Management

   382 

   383 static const ALCchar sendDevice[] = "Multiple Audio Send";

   384 

   385 static ALCboolean send_open_playback(ALCdevice *device, 

   386  const ALCchar *deviceName)

   387 {

   388   send_data *data;

   389   // stop any buffering for stdout, so that I can 

   390   // see the printf statements in my terminal immediatley

   391   setbuf(stdout, NULL);

   392 

   393   if(!deviceName)

   394     deviceName = sendDevice;

   395   else if(strcmp(deviceName, sendDevice) != 0)

   396     return ALC_FALSE;

   397   data = (send_data*)calloc(1, sizeof(*data));

   398   device->szDeviceName = strdup(deviceName);

   399   device->ExtraData = data;

   400   return ALC_TRUE;

   401 }

   402 

   403 static void send_close_playback(ALCdevice *device)

   404 {

   405   send_data *data = (send_data*)device->ExtraData;

   406   alcMakeContextCurrent(NULL);

   407   ALuint i;

   408   // Destroy all slave contexts. LWJGL will take care of 

   409   // its own context.

   410   for (i = 1; i < data->numContexts; i++){

   411     context_data *ctxData = data->contexts[i];

   412     alcDestroyContext(ctxData->ctx);

   413     free(ctxData->renderBuffer);

   414     free(ctxData);

   415   }

   416   free(data);

   417   device->ExtraData = NULL;

   418 }

   419 

   420 static ALCboolean send_reset_playback(ALCdevice *device)

   421 {

   422   send_data *data = (send_data*)device->ExtraData;

   423   ALuint channels=0, bits=0;

   424   device->FmtType = DevFmtShort;

   425   bits = BytesFromDevFmt(device->FmtType) * 8;

   426   channels = ChannelsFromDevFmt(device->FmtChans);

   427   data->size = device->UpdateSize * channels * bits / 8;

   428 

   429   return ALC_TRUE;

   430 }

   431 

   432 static void send_stop_playback(ALCdevice *Device){

   433   UNUSED(Device);

   434 }

   435 

   436 static const BackendFuncs send_funcs = {

   437   send_open_playback,

   438   send_close_playback,

   439   send_reset_playback,

   440   send_stop_playback,

   441   NULL,

   442   NULL,  /* These would be filled with functions to    */

   443   NULL,  /* handle capturing audio if we we into that  */

   444   NULL,  /* sort of thing...                           */

   445   NULL,

   446   NULL

   447 };

   448 

   449 ALCboolean alc_send_init(BackendFuncs *func_list){

   450   *func_list = send_funcs;

   451   return ALC_TRUE;

   452 }

   453 

   454 void alc_send_deinit(void){}

   455 

   456 void alc_send_probe(enum DevProbe type)

   457 {

   458   switch(type)

   459     {

   460     case DEVICE_PROBE:

   461       AppendDeviceList(sendDevice);

   462       break;

   463     case ALL_DEVICE_PROBE:

   464       AppendAllDeviceList(sendDevice);

   465       break;

   466     case CAPTURE_DEVICE_PROBE:

   467       break;

   468     }

   469 }

   470 

   471 

   472
author	Robert McIntyre <rlm@mit.edu>
date	Thu, 27 Oct 2011 02:47:28 -0700
parents	37f25cb34196
children	92b416b4e027