src/stream.cpp

   1 /*
   2  * ALURE  OpenAL utility library
   3  * Copyright (c) 2009 by Chris Robinson.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to
   7  * deal in the Software without restriction, including without limitation the
   8  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   9  * sell copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /* Title: Streaming */
  25
  26 #include "config.h"
  27
  28 #include "main.h"
  29
  30 #include <string.h>
  31
  32 #include <memory>
  33
  34 static bool SizeIsUS = false;
  35
  36 static alureStream *InitStream(alureStream *instream, ALsizei chunkLength, ALsizei numBufs, ALuint *bufs)
  37 {
  38     std::auto_ptr<std::istream> fstream(instream->fstream);
  39     std::auto_ptr<alureStream> stream(instream);
  40     ALenum format;
  41     ALuint freq, blockAlign;
  42
  43     if(!stream->GetFormat(&format, &freq, &blockAlign))
  44     {
  45         SetError("Could not get stream format");
  46         return NULL;
  47     }
  48
  49     if(format == AL_NONE)
  50     {
  51         SetError("No valid format");
  52         return NULL;
  53     }
  54     if(blockAlign == 0)
  55     {
  56         SetError("Invalid block size");
  57         return NULL;
  58     }
  59     if(freq == 0)
  60     {
  61         SetError("Invalid sample rate");
  62         return NULL;
  63     }
  64
  65     if(SizeIsUS)
  66     {
  67         ALuint framesPerBlock = DetectCompressionRate(format);
  68         ALuint blockSize = DetectBlockAlignment(format);
  69         if(framesPerBlock == 0 || blockSize == 0)
  70         {
  71             SetError("Unknown compression rate");
  72             return NULL;
  73         }
  74
  75         alureUInt64 len64 = chunkLength;
  76         len64 = len64 * freq / 1000000 / framesPerBlock * blockSize;
  77         if(len64 > 0x7FFFFFFF)
  78         {
  79             SetError("Chunk length too large");
  80             return NULL;
  81         }
  82         chunkLength = len64;
  83     }
  84
  85     chunkLength -= chunkLength%blockAlign;
  86     if(chunkLength <= 0)
  87     {
  88         SetError("Chunk length too small");
  89         return NULL;
  90     }
  91
  92     stream->dataChunk.resize(chunkLength);
  93
  94     if(numBufs > 0)
  95     {
  96         alGenBuffers(numBufs, bufs);
  97         if(alGetError() != AL_NO_ERROR)
  98         {
  99             SetError("Buffer creation failed");
 100             return NULL;
 101         }
 102     }
 103
 104     ALsizei filled;
 105     for(filled = 0;filled < numBufs;filled++)
 106     {
 107         ALuint got = stream->GetData(&stream->dataChunk[0], stream->dataChunk.size());
 108         got -= got%blockAlign;
 109         if(got == 0) break;
 110
 111         alBufferData(bufs[filled], format, &stream->dataChunk[0], got, freq);
 112     }
 113
 114     while(filled < numBufs)
 115     {
 116         alBufferData(bufs[filled], format, &stream->dataChunk[0], 0, freq);
 117         filled++;
 118     }
 119     if(alGetError() != AL_NO_ERROR)
 120     {
 121         alDeleteBuffers(numBufs, bufs);
 122         alGetError();
 123
 124         SetError("Buffering error");
 125         return NULL;
 126     }
 127
 128     fstream.release();
 129     return stream.release();
 130 }
 131
 132
 133 extern "C" {
 134
 135 /* Function: alureStreamSizeIsMicroSec
 136  *
 137  * Specifies if the chunk size value given to the alureCreateStream functions
 138  * is in bytes (default) or microseconds. Specifying the size in microseconds
 139  * can help manage the time needed in between needed updates (since the format
 140  * and sample rate of the stream may not be known), while specifying the size
 141  * in bytes can help control memory usage.
 142  *
 143  * Returns:
 144  * Previously set value.
 145  *
 146  * *Version Added*: 1.1
 147  *
 148  * See Also:
 149  * <alureCreateStreamFromFile>, <alureCreateStreamFromMemory>,
 150  * <alureCreateStreamFromStaticMemory>, <alureCreateStreamFromCallback>
 151  */
 152 ALURE_API ALboolean ALURE_APIENTRY alureStreamSizeIsMicroSec(ALboolean useUS)
 153 {
 154     ALboolean old = (SizeIsUS ? AL_TRUE : AL_FALSE);
 155     SizeIsUS = !!useUS;
 156     return old;
 157 }
 158
 159 /* Function: alureCreateStreamFromFile
 160  *
 161  * Opens a file and sets it up for streaming. The given chunkLength is the
 162  * number of bytes, or microseconds worth of bytes if
 163  * <alureStreamSizeIsMicroSec> was last called with AL_TRUE, each buffer will
 164  * fill with. ALURE will optionally generate the specified number of buffer
 165  * objects, fill them with the beginning of the data, then place the new IDs
 166  * into the provided storage, before returning. Requires an active context.
 167  *
 168  * Returns:
 169  * An opaque handle used to control the opened stream, or NULL on error.
 170  *
 171  * See Also:
 172  * <alureStreamSizeIsMicroSec>, <alureCreateStreamFromMemory>,
 173  * <alureCreateStreamFromStaticMemory>, <alureCreateStreamFromCallback>
 174  */
 175 ALURE_API alureStream* ALURE_APIENTRY alureCreateStreamFromFile(const ALchar *fname, ALsizei chunkLength, ALsizei numBufs, ALuint *bufs)
 176 {
 177     if(alGetError() != AL_NO_ERROR)
 178     {
 179         SetError("Existing OpenAL error");
 180         return NULL;
 181     }
 182
 183     if(chunkLength < 0)
 184     {
 185         SetError("Invalid chunk length");
 186         return NULL;
 187     }
 188
 189     if(numBufs < 0)
 190     {
 191         SetError("Invalid buffer count");
 192         return NULL;
 193     }
 194
 195     alureStream *stream = create_stream(fname);
 196     if(!stream) return NULL;
 197
 198     return InitStream(stream, chunkLength, numBufs, bufs);
 199 }
 200
 201 /* Function: alureCreateStreamFromMemory
 202  *
 203  * Opens a file image from memory and sets it up for streaming, similar to
 204  * <alureCreateStreamFromFile>. The given data buffer can be safely deleted
 205  * after calling this function. Requires an active context.
 206  *
 207  * Returns:
 208  * An opaque handle used to control the opened stream, or NULL on error.
 209  *
 210  * See Also:
 211  * <alureStreamSizeIsMicroSec>, <alureCreateStreamFromFile>,
 212  * <alureCreateStreamFromStaticMemory>, <alureCreateStreamFromCallback>
 213  */
 214 ALURE_API alureStream* ALURE_APIENTRY alureCreateStreamFromMemory(const ALubyte *fdata, ALuint length, ALsizei chunkLength, ALsizei numBufs, ALuint *bufs)
 215 {
 216     if(alGetError() != AL_NO_ERROR)
 217     {
 218         SetError("Existing OpenAL error");
 219         return NULL;
 220     }
 221
 222     if(chunkLength < 0)
 223     {
 224         SetError("Invalid chunk length");
 225         return NULL;
 226     }
 227
 228     if(numBufs < 0)
 229     {
 230         SetError("Invalid buffer count");
 231         return NULL;
 232     }
 233
 234     if(length <= 0)
 235     {
 236         SetError("Invalid data length");
 237         return NULL;
 238     }
 239
 240     ALubyte *streamData = new ALubyte[length];
 241     memcpy(streamData, fdata, length);
 242
 243     MemDataInfo memData;
 244     memData.Data = streamData;
 245     memData.Length = length;
 246     memData.Pos = 0;
 247
 248     alureStream *stream = create_stream(memData);
 249     if(!stream) return NULL;
 250
 251     stream->data = streamData;
 252     return InitStream(stream, chunkLength, numBufs, bufs);
 253 }
 254
 255 /* Function: alureCreateStreamFromStaticMemory
 256  *
 257  * Identical to <alureCreateStreamFromMemory>, except the given memory is used
 258  * directly and not duplicated. As a consequence, the data buffer must remain
 259  * valid while the stream is alive. Requires an active context.
 260  *
 261  * Returns:
 262  * An opaque handle used to control the opened stream, or NULL on error.
 263  *
 264  * See Also:
 265  * <alureStreamSizeIsMicroSec>, <alureCreateStreamFromFile>,
 266  * <alureCreateStreamFromMemory>, <alureCreateStreamFromCallback>
 267  */
 268 ALURE_API alureStream* ALURE_APIENTRY alureCreateStreamFromStaticMemory(const ALubyte *fdata, ALuint length, ALsizei chunkLength, ALsizei numBufs, ALuint *bufs)
 269 {
 270     if(alGetError() != AL_NO_ERROR)
 271     {
 272         SetError("Existing OpenAL error");
 273         return NULL;
 274     }
 275
 276     if(chunkLength < 0)
 277     {
 278         SetError("Invalid chunk length");
 279         return NULL;
 280     }
 281
 282     if(numBufs < 0)
 283     {
 284         SetError("Invalid buffer count");
 285         return NULL;
 286     }
 287
 288     if(length <= 0)
 289     {
 290         SetError("Invalid data length");
 291         return NULL;
 292     }
 293
 294     MemDataInfo memData;
 295     memData.Data = fdata;
 296     memData.Length = length;
 297     memData.Pos = 0;
 298
 299     alureStream *stream = create_stream(memData);
 300     if(!stream) return NULL;
 301
 302     return InitStream(stream, chunkLength, numBufs, bufs);
 303 }
 304
 305 /* Function: alureCreateStreamFromCallback
 306  *
 307  * Creates a stream using the specified callback to retrieve data. Requires an
 308  * active context.
 309  *
 310  * Parameters:
 311  * callback - This is called when more data is needed from the stream. Up to
 312  *            the specified number of bytes should be written to the data
 313  *            pointer, and the number of bytes actually written should be
 314  *            returned. The number of bytes written must be block aligned for
 315  *            the format (eg. a multiple of 4 for AL_FORMAT_STEREO16), or an
 316  *            OpenAL error may occur during buffering.
 317  * userdata - A handle passed through to the callback.
 318  * format - The format of the data the callback will be giving. The format must
 319  *          be valid for the context.
 320  * samplerate - The sample rate (frequency) of the stream
 321  *
 322  * Returns:
 323  * An opaque handle used to control the opened stream, or NULL on error.
 324  *
 325  * See Also:
 326  * <alureStreamSizeIsMicroSec>, <alureCreateStreamFromFile>,
 327  * <alureCreateStreamFromMemory>, <alureCreateStreamFromStaticMemory>
 328  */
 329 ALURE_API alureStream* ALURE_APIENTRY alureCreateStreamFromCallback(
 330       ALuint (*callback)(void *userdata, ALubyte *data, ALuint bytes),
 331       void *userdata, ALenum format, ALuint samplerate,
 332       ALsizei chunkLength, ALsizei numBufs, ALuint *bufs)
 333 {
 334     if(alGetError() != AL_NO_ERROR)
 335     {
 336         SetError("Existing OpenAL error");
 337         return NULL;
 338     }
 339
 340     if(callback == NULL)
 341     {
 342         SetError("Invalid callback");
 343         return NULL;
 344     }
 345
 346     if(chunkLength < 0)
 347     {
 348         SetError("Invalid chunk length");
 349         return NULL;
 350     }
 351
 352     if(numBufs < 0)
 353     {
 354         SetError("Invalid buffer count");
 355         return NULL;
 356     }
 357
 358     UserCallbacks newcb;
 359     newcb.open_file = NULL;
 360     newcb.open_mem  = NULL;
 361     newcb.get_fmt   = NULL;
 362     newcb.decode    = callback;
 363     newcb.rewind    = NULL;
 364     newcb.close     = NULL;
 365
 366     alureStream *stream = create_stream(userdata, format, samplerate, newcb);
 367     return InitStream(stream, chunkLength, numBufs, bufs);
 368 }
 369
 370 /* Function: alureGetStreamFrequency
 371  *
 372  * Retrieves the frequency used for the given stream.
 373  *
 374  * Returns:
 375  * 0 on error.
 376  *
 377  * *Version Added*: 1.1
 378  */
 379 ALURE_API ALsizei ALURE_APIENTRY alureGetStreamFrequency(alureStream *stream)
 380 {
 381     ALenum format;
 382     ALuint rate, balign;
 383
 384     if(!alureStream::Verify(stream))
 385     {
 386         SetError("Invalid stream pointer");
 387         return 0;
 388     }
 389
 390     if(!stream->GetFormat(&format, &rate, &balign))
 391     {
 392         SetError("Could not get stream format");
 393         return 0;
 394     }
 395
 396     return rate;
 397 }
 398
 399 /* Function: alureBufferDataFromStream
 400  *
 401  * Buffers the given buffer objects with the next chunks of data from the
 402  * stream. The given buffer objects do not need to be ones given by the
 403  * alureCreateStreamFrom* functions. Requires an active context.
 404  *
 405  * Returns:
 406  * The number of buffers filled with new data, or -1 on error. If the value
 407  * returned is less than the number requested, the end of the stream has been
 408  * reached.
 409  */
 410 ALURE_API ALsizei ALURE_APIENTRY alureBufferDataFromStream(alureStream *stream, ALsizei numBufs, ALuint *bufs)
 411 {
 412     if(alGetError() != AL_NO_ERROR)
 413     {
 414         SetError("Existing OpenAL error");
 415         return -1;
 416     }
 417
 418     if(!alureStream::Verify(stream))
 419     {
 420         SetError("Invalid stream pointer");
 421         return -1;
 422     }
 423
 424     if(numBufs < 0)
 425     {
 426         SetError("Invalid buffer count");
 427         return -1;
 428     }
 429
 430     for(ALsizei i = 0;i < numBufs;i++)
 431     {
 432         if(!bufs[i] || !alIsBuffer(bufs[i]))
 433         {
 434             SetError("Invalid buffer ID");
 435             return -1;
 436         }
 437     }
 438
 439     ALenum format;
 440     ALuint freq, blockAlign;
 441
 442     if(!stream->GetFormat(&format, &freq, &blockAlign))
 443     {
 444         SetError("Could not get stream format");
 445         return -1;
 446     }
 447
 448     ALsizei filled;
 449     for(filled = 0;filled < numBufs;filled++)
 450     {
 451         ALuint got = stream->GetData(&stream->dataChunk[0], stream->dataChunk.size());
 452         got -= got%blockAlign;
 453         if(got == 0) break;
 454
 455         alBufferData(bufs[filled], format, &stream->dataChunk[0], got, freq);
 456         if(alGetError() != AL_NO_ERROR)
 457         {
 458             SetError("Buffer load failed");
 459             return -1;
 460         }
 461     }
 462
 463     return filled;
 464 }
 465
 466 /* Function: alureRewindStream
 467  *
 468  * Rewinds the stream so that the next alureBufferDataFromStream call will
 469  * restart from the beginning of the audio file.
 470  *
 471  * Returns:
 472  * AL_FALSE on error.
 473  *
 474  * See Also:
 475  * <alureSetStreamOrder>
 476  */
 477 ALURE_API ALboolean ALURE_APIENTRY alureRewindStream(alureStream *stream)
 478 {
 479     if(!alureStream::Verify(stream))
 480     {
 481         SetError("Invalid stream pointer");
 482         return AL_FALSE;
 483     }
 484
 485     return stream->Rewind();
 486 }
 487
 488 /* Function: alureSetStreamOrder
 489  *
 490  * Skips the module decoder to the specified order, so following buffering
 491  * calls will decode from the specified order. For non-module formats, setting
 492  * order 0 is identical to rewinding the stream (other orders will fail).
 493  *
 494  * Returns:
 495  * AL_FALSE on error.
 496  *
 497  * *Version Added*: 1.1
 498  *
 499  * See Also:
 500  * <alureRewindStream>
 501  */
 502 ALURE_API ALboolean ALURE_APIENTRY alureSetStreamOrder(alureStream *stream, ALuint order)
 503 {
 504     if(!alureStream::Verify(stream))
 505     {
 506         SetError("Invalid stream pointer");
 507         return AL_FALSE;
 508     }
 509
 510     return stream->SetOrder(order);
 511 }
 512
 513 /* Function: alureSetStreamPatchset
 514  *
 515  * Specifies the patchset to use for MIDI streams. By default, the FluidSynth
 516  * decoder will look for one in the FLUID_SOUNDFONT environment variable, but
 517  * this can be used to change it to something different. On non-MIDI streams,
 518  * this has no effect.
 519  *
 520  * Returns:
 521  * AL_FALSE on error.
 522  *
 523  * *Version Added*: 1.1
 524  */
 525 ALURE_API ALboolean ALURE_APIENTRY alureSetStreamPatchset(alureStream *stream, const ALchar *patchset)
 526 {
 527     if(!alureStream::Verify(stream))
 528     {
 529         SetError("Invalid stream pointer");
 530         return AL_FALSE;
 531     }
 532
 533     return stream->SetPatchset(patchset);
 534 }
 535
 536 /* Function: alureDestroyStream
 537  *
 538  * Closes an opened stream. For convenience, it will also delete the given
 539  * buffer objects. The given buffer objects do not need to be ones given by the
 540  * alureCreateStreamFrom* functions. Requires an active context.
 541  *
 542  * Returns:
 543  * AL_FALSE on error.
 544  */
 545 ALURE_API ALboolean ALURE_APIENTRY alureDestroyStream(alureStream *stream, ALsizei numBufs, ALuint *bufs)
 546 {
 547     if(alGetError() != AL_NO_ERROR)
 548     {
 549         SetError("Existing OpenAL error");
 550         return AL_FALSE;
 551     }
 552
 553     if(numBufs < 0)
 554     {
 555         SetError("Invalid buffer count");
 556         return AL_FALSE;
 557     }
 558
 559     if(stream && !alureStream::Verify(stream))
 560     {
 561         SetError("Invalid stream pointer");
 562         return AL_FALSE;
 563     }
 564
 565     if(numBufs > 0)
 566     {
 567         alDeleteBuffers(numBufs, bufs);
 568         if(alGetError() != AL_NO_ERROR)
 569         {
 570             SetError("Buffer deletion failed");
 571             return AL_FALSE;
 572         }
 573     }
 574
 575     if(stream)
 576     {
 577         StopStream(stream);
 578         std::istream *f = stream->fstream;
 579         delete stream;
 580         delete f;
 581     }
 582     return AL_TRUE;
 583 }
 584
 585 }