1 /* libFLAC - Free Lossless Audio Codec library 2 * Copyright (C) 2000-2009 Josh Coalson 3 * Copyright (C) 2011-2016 Xiph.Org Foundation 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * - Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * - Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * - Neither the name of the Xiph.org Foundation nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef FLAC__STREAM_ENCODER_H 34 #define FLAC__STREAM_ENCODER_H 35 36 #include <stdio.h> /* for FILE */ 37 #include "export.h" 38 #include "format.h" 39 #include "stream_decoder.h" 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 46 /** \file include/FLAC/stream_encoder.h 47 * 48 * \brief 49 * This module contains the functions which implement the stream 50 * encoder. 51 * 52 * See the detailed documentation in the 53 * \link flac_stream_encoder stream encoder \endlink module. 54 */ 55 56 /** \defgroup flac_encoder FLAC/ \*_encoder.h: encoder interfaces 57 * \ingroup flac 58 * 59 * \brief 60 * This module describes the encoder layers provided by libFLAC. 61 * 62 * The stream encoder can be used to encode complete streams either to the 63 * client via callbacks, or directly to a file, depending on how it is 64 * initialized. When encoding via callbacks, the client provides a write 65 * callback which will be called whenever FLAC data is ready to be written. 66 * If the client also supplies a seek callback, the encoder will also 67 * automatically handle the writing back of metadata discovered while 68 * encoding, like stream info, seek points offsets, etc. When encoding to 69 * a file, the client needs only supply a filename or open \c FILE* and an 70 * optional progress callback for periodic notification of progress; the 71 * write and seek callbacks are supplied internally. For more info see the 72 * \link flac_stream_encoder stream encoder \endlink module. 73 */ 74 75 /** \defgroup flac_stream_encoder FLAC/stream_encoder.h: stream encoder interface 76 * \ingroup flac_encoder 77 * 78 * \brief 79 * This module contains the functions which implement the stream 80 * encoder. 81 * 82 * The stream encoder can encode to native FLAC, and optionally Ogg FLAC 83 * (check FLAC_API_SUPPORTS_OGG_FLAC) streams and files. 84 * 85 * The basic usage of this encoder is as follows: 86 * - The program creates an instance of an encoder using 87 * FLAC__stream_encoder_new(). 88 * - The program overrides the default settings using 89 * FLAC__stream_encoder_set_*() functions. At a minimum, the following 90 * functions should be called: 91 * - FLAC__stream_encoder_set_channels() 92 * - FLAC__stream_encoder_set_bits_per_sample() 93 * - FLAC__stream_encoder_set_sample_rate() 94 * - FLAC__stream_encoder_set_ogg_serial_number() (if encoding to Ogg FLAC) 95 * - FLAC__stream_encoder_set_total_samples_estimate() (if known) 96 * - If the application wants to control the compression level or set its own 97 * metadata, then the following should also be called: 98 * - FLAC__stream_encoder_set_compression_level() 99 * - FLAC__stream_encoder_set_verify() 100 * - FLAC__stream_encoder_set_metadata() 101 * - The rest of the set functions should only be called if the client needs 102 * exact control over how the audio is compressed; thorough understanding 103 * of the FLAC format is necessary to achieve good results. 104 * - The program initializes the instance to validate the settings and 105 * prepare for encoding using 106 * - FLAC__stream_encoder_init_stream() or FLAC__stream_encoder_init_FILE() 107 * or FLAC__stream_encoder_init_file() for native FLAC 108 * - FLAC__stream_encoder_init_ogg_stream() or FLAC__stream_encoder_init_ogg_FILE() 109 * or FLAC__stream_encoder_init_ogg_file() for Ogg FLAC 110 * - The program calls FLAC__stream_encoder_process() or 111 * FLAC__stream_encoder_process_interleaved() to encode data, which 112 * subsequently calls the callbacks when there is encoder data ready 113 * to be written. 114 * - The program finishes the encoding with FLAC__stream_encoder_finish(), 115 * which causes the encoder to encode any data still in its input pipe, 116 * update the metadata with the final encoding statistics if output 117 * seeking is possible, and finally reset the encoder to the 118 * uninitialized state. 119 * - The instance may be used again or deleted with 120 * FLAC__stream_encoder_delete(). 121 * 122 * In more detail, the stream encoder functions similarly to the 123 * \link flac_stream_decoder stream decoder \endlink, but has fewer 124 * callbacks and more options. Typically the client will create a new 125 * instance by calling FLAC__stream_encoder_new(), then set the necessary 126 * parameters with FLAC__stream_encoder_set_*(), and initialize it by 127 * calling one of the FLAC__stream_encoder_init_*() functions. 128 * 129 * Unlike the decoders, the stream encoder has many options that can 130 * affect the speed and compression ratio. When setting these parameters 131 * you should have some basic knowledge of the format (see the 132 * <A HREF="../documentation_format_overview.html">user-level documentation</A> 133 * or the <A HREF="../format.html">formal description</A>). The 134 * FLAC__stream_encoder_set_*() functions themselves do not validate the 135 * values as many are interdependent. The FLAC__stream_encoder_init_*() 136 * functions will do this, so make sure to pay attention to the state 137 * returned by FLAC__stream_encoder_init_*() to make sure that it is 138 * FLAC__STREAM_ENCODER_INIT_STATUS_OK. Any parameters that are not set 139 * before FLAC__stream_encoder_init_*() will take on the defaults from 140 * the constructor. 141 * 142 * There are three initialization functions for native FLAC, one for 143 * setting up the encoder to encode FLAC data to the client via 144 * callbacks, and two for encoding directly to a file. 145 * 146 * For encoding via callbacks, use FLAC__stream_encoder_init_stream(). 147 * You must also supply a write callback which will be called anytime 148 * there is raw encoded data to write. If the client can seek the output 149 * it is best to also supply seek and tell callbacks, as this allows the 150 * encoder to go back after encoding is finished to write back 151 * information that was collected while encoding, like seek point offsets, 152 * frame sizes, etc. 153 * 154 * For encoding directly to a file, use FLAC__stream_encoder_init_FILE() 155 * or FLAC__stream_encoder_init_file(). Then you must only supply a 156 * filename or open \c FILE*; the encoder will handle all the callbacks 157 * internally. You may also supply a progress callback for periodic 158 * notification of the encoding progress. 159 * 160 * There are three similarly-named init functions for encoding to Ogg 161 * FLAC streams. Check \c FLAC_API_SUPPORTS_OGG_FLAC to find out if the 162 * library has been built with Ogg support. 163 * 164 * The call to FLAC__stream_encoder_init_*() currently will also immediately 165 * call the write callback several times, once with the \c fLaC signature, 166 * and once for each encoded metadata block. Note that for Ogg FLAC 167 * encoding you will usually get at least twice the number of callbacks than 168 * with native FLAC, one for the Ogg page header and one for the page body. 169 * 170 * After initializing the instance, the client may feed audio data to the 171 * encoder in one of two ways: 172 * 173 * - Channel separate, through FLAC__stream_encoder_process() - The client 174 * will pass an array of pointers to buffers, one for each channel, to 175 * the encoder, each of the same length. The samples need not be 176 * block-aligned, but each channel should have the same number of samples. 177 * - Channel interleaved, through 178 * FLAC__stream_encoder_process_interleaved() - The client will pass a single 179 * pointer to data that is channel-interleaved (i.e. channel0_sample0, 180 * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...). 181 * Again, the samples need not be block-aligned but they must be 182 * sample-aligned, i.e. the first value should be channel0_sample0 and 183 * the last value channelN_sampleM. 184 * 185 * Note that for either process call, each sample in the buffers should be a 186 * signed integer, right-justified to the resolution set by 187 * FLAC__stream_encoder_set_bits_per_sample(). For example, if the resolution 188 * is 16 bits per sample, the samples should all be in the range [-32768,32767]. 189 * 190 * When the client is finished encoding data, it calls 191 * FLAC__stream_encoder_finish(), which causes the encoder to encode any 192 * data still in its input pipe, and call the metadata callback with the 193 * final encoding statistics. Then the instance may be deleted with 194 * FLAC__stream_encoder_delete() or initialized again to encode another 195 * stream. 196 * 197 * For programs that write their own metadata, but that do not know the 198 * actual metadata until after encoding, it is advantageous to instruct 199 * the encoder to write a PADDING block of the correct size, so that 200 * instead of rewriting the whole stream after encoding, the program can 201 * just overwrite the PADDING block. If only the maximum size of the 202 * metadata is known, the program can write a slightly larger padding 203 * block, then split it after encoding. 204 * 205 * Make sure you understand how lengths are calculated. All FLAC metadata 206 * blocks have a 4 byte header which contains the type and length. This 207 * length does not include the 4 bytes of the header. See the format page 208 * for the specification of metadata blocks and their lengths. 209 * 210 * \note 211 * If you are writing the FLAC data to a file via callbacks, make sure it 212 * is open for update (e.g. mode "w+" for stdio streams). This is because 213 * after the first encoding pass, the encoder will try to seek back to the 214 * beginning of the stream, to the STREAMINFO block, to write some data 215 * there. (If using FLAC__stream_encoder_init*_file() or 216 * FLAC__stream_encoder_init*_FILE(), the file is managed internally.) 217 * 218 * \note 219 * The "set" functions may only be called when the encoder is in the 220 * state FLAC__STREAM_ENCODER_UNINITIALIZED, i.e. after 221 * FLAC__stream_encoder_new() or FLAC__stream_encoder_finish(), but 222 * before FLAC__stream_encoder_init_*(). If this is the case they will 223 * return \c true, otherwise \c false. 224 * 225 * \note 226 * FLAC__stream_encoder_finish() resets all settings to the constructor 227 * defaults. 228 * 229 * \{ 230 */ 231 232 233 /** State values for a FLAC__StreamEncoder. 234 * 235 * The encoder's state can be obtained by calling FLAC__stream_encoder_get_state(). 236 * 237 * If the encoder gets into any other state besides \c FLAC__STREAM_ENCODER_OK 238 * or \c FLAC__STREAM_ENCODER_UNINITIALIZED, it becomes invalid for encoding and 239 * must be deleted with FLAC__stream_encoder_delete(). 240 */ 241 typedef enum { 242 243 FLAC__STREAM_ENCODER_OK = 0, 244 /**< The encoder is in the normal OK state and samples can be processed. */ 245 246 FLAC__STREAM_ENCODER_UNINITIALIZED, 247 /**< The encoder is in the uninitialized state; one of the 248 * FLAC__stream_encoder_init_*() functions must be called before samples 249 * can be processed. 250 */ 251 252 FLAC__STREAM_ENCODER_OGG_ERROR, 253 /**< An error occurred in the underlying Ogg layer. */ 254 255 FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR, 256 /**< An error occurred in the underlying verify stream decoder; 257 * check FLAC__stream_encoder_get_verify_decoder_state(). 258 */ 259 260 FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA, 261 /**< The verify decoder detected a mismatch between the original 262 * audio signal and the decoded audio signal. 263 */ 264 265 FLAC__STREAM_ENCODER_CLIENT_ERROR, 266 /**< One of the callbacks returned a fatal error. */ 267 268 FLAC__STREAM_ENCODER_IO_ERROR, 269 /**< An I/O error occurred while opening/reading/writing a file. 270 * Check \c errno. 271 */ 272 273 FLAC__STREAM_ENCODER_FRAMING_ERROR, 274 /**< An error occurred while writing the stream; usually, the 275 * write_callback returned an error. 276 */ 277 278 FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR 279 /**< Memory allocation failed. */ 280 281 } FLAC__StreamEncoderState; 282 283 /** Maps a FLAC__StreamEncoderState to a C string. 284 * 285 * Using a FLAC__StreamEncoderState as the index to this array 286 * will give the string equivalent. The contents should not be modified. 287 */ 288 extern FLAC_API const char * const FLAC__StreamEncoderStateString[]; 289 290 291 /** Possible return values for the FLAC__stream_encoder_init_*() functions. 292 */ 293 typedef enum { 294 295 FLAC__STREAM_ENCODER_INIT_STATUS_OK = 0, 296 /**< Initialization was successful. */ 297 298 FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR, 299 /**< General failure to set up encoder; call FLAC__stream_encoder_get_state() for cause. */ 300 301 FLAC__STREAM_ENCODER_INIT_STATUS_UNSUPPORTED_CONTAINER, 302 /**< The library was not compiled with support for the given container 303 * format. 304 */ 305 306 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS, 307 /**< A required callback was not supplied. */ 308 309 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS, 310 /**< The encoder has an invalid setting for number of channels. */ 311 312 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BITS_PER_SAMPLE, 313 /**< The encoder has an invalid setting for bits-per-sample. 314 * FLAC supports 4-32 bps but the reference encoder currently supports 315 * only up to 24 bps. 316 */ 317 318 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_SAMPLE_RATE, 319 /**< The encoder has an invalid setting for the input sample rate. */ 320 321 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE, 322 /**< The encoder has an invalid setting for the block size. */ 323 324 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER, 325 /**< The encoder has an invalid setting for the maximum LPC order. */ 326 327 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION, 328 /**< The encoder has an invalid setting for the precision of the quantized linear predictor coefficients. */ 329 330 FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER, 331 /**< The specified block size is less than the maximum LPC order. */ 332 333 FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE, 334 /**< The encoder is bound to the <A HREF="../format.html#subset">Subset</A> but other settings violate it. */ 335 336 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA, 337 /**< The metadata input to the encoder is invalid, in one of the following ways: 338 * - FLAC__stream_encoder_set_metadata() was called with a null pointer but a block count > 0 339 * - One of the metadata blocks contains an undefined type 340 * - It contains an illegal CUESHEET as checked by FLAC__format_cuesheet_is_legal() 341 * - It contains an illegal SEEKTABLE as checked by FLAC__format_seektable_is_legal() 342 * - It contains more than one SEEKTABLE block or more than one VORBIS_COMMENT block 343 */ 344 345 FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED 346 /**< FLAC__stream_encoder_init_*() was called when the encoder was 347 * already initialized, usually because 348 * FLAC__stream_encoder_finish() was not called. 349 */ 350 351 } FLAC__StreamEncoderInitStatus; 352 353 /** Maps a FLAC__StreamEncoderInitStatus to a C string. 354 * 355 * Using a FLAC__StreamEncoderInitStatus as the index to this array 356 * will give the string equivalent. The contents should not be modified. 357 */ 358 extern FLAC_API const char * const FLAC__StreamEncoderInitStatusString[]; 359 360 361 /** Return values for the FLAC__StreamEncoder read callback. 362 */ 363 typedef enum { 364 365 FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE, 366 /**< The read was OK and decoding can continue. */ 367 368 FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM, 369 /**< The read was attempted at the end of the stream. */ 370 371 FLAC__STREAM_ENCODER_READ_STATUS_ABORT, 372 /**< An unrecoverable error occurred. */ 373 374 FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED 375 /**< Client does not support reading back from the output. */ 376 377 } FLAC__StreamEncoderReadStatus; 378 379 /** Maps a FLAC__StreamEncoderReadStatus to a C string. 380 * 381 * Using a FLAC__StreamEncoderReadStatus as the index to this array 382 * will give the string equivalent. The contents should not be modified. 383 */ 384 extern FLAC_API const char * const FLAC__StreamEncoderReadStatusString[]; 385 386 387 /** Return values for the FLAC__StreamEncoder write callback. 388 */ 389 typedef enum { 390 391 FLAC__STREAM_ENCODER_WRITE_STATUS_OK = 0, 392 /**< The write was OK and encoding can continue. */ 393 394 FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR 395 /**< An unrecoverable error occurred. The encoder will return from the process call. */ 396 397 } FLAC__StreamEncoderWriteStatus; 398 399 /** Maps a FLAC__StreamEncoderWriteStatus to a C string. 400 * 401 * Using a FLAC__StreamEncoderWriteStatus as the index to this array 402 * will give the string equivalent. The contents should not be modified. 403 */ 404 extern FLAC_API const char * const FLAC__StreamEncoderWriteStatusString[]; 405 406 407 /** Return values for the FLAC__StreamEncoder seek callback. 408 */ 409 typedef enum { 410 411 FLAC__STREAM_ENCODER_SEEK_STATUS_OK, 412 /**< The seek was OK and encoding can continue. */ 413 414 FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR, 415 /**< An unrecoverable error occurred. */ 416 417 FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED 418 /**< Client does not support seeking. */ 419 420 } FLAC__StreamEncoderSeekStatus; 421 422 /** Maps a FLAC__StreamEncoderSeekStatus to a C string. 423 * 424 * Using a FLAC__StreamEncoderSeekStatus as the index to this array 425 * will give the string equivalent. The contents should not be modified. 426 */ 427 extern FLAC_API const char * const FLAC__StreamEncoderSeekStatusString[]; 428 429 430 /** Return values for the FLAC__StreamEncoder tell callback. 431 */ 432 typedef enum { 433 434 FLAC__STREAM_ENCODER_TELL_STATUS_OK, 435 /**< The tell was OK and encoding can continue. */ 436 437 FLAC__STREAM_ENCODER_TELL_STATUS_ERROR, 438 /**< An unrecoverable error occurred. */ 439 440 FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED 441 /**< Client does not support seeking. */ 442 443 } FLAC__StreamEncoderTellStatus; 444 445 /** Maps a FLAC__StreamEncoderTellStatus to a C string. 446 * 447 * Using a FLAC__StreamEncoderTellStatus as the index to this array 448 * will give the string equivalent. The contents should not be modified. 449 */ 450 extern FLAC_API const char * const FLAC__StreamEncoderTellStatusString[]; 451 452 453 /*********************************************************************** 454 * 455 * class FLAC__StreamEncoder 456 * 457 ***********************************************************************/ 458 459 struct FLAC__StreamEncoderProtected; 460 struct FLAC__StreamEncoderPrivate; 461 /** The opaque structure definition for the stream encoder type. 462 * See the \link flac_stream_encoder stream encoder module \endlink 463 * for a detailed description. 464 */ 465 typedef struct { 466 struct FLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */ 467 struct FLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */ 468 } FLAC__StreamEncoder; 469 470 /** Signature for the read callback. 471 * 472 * A function pointer matching this signature must be passed to 473 * FLAC__stream_encoder_init_ogg_stream() if seeking is supported. 474 * The supplied function will be called when the encoder needs to read back 475 * encoded data. This happens during the metadata callback, when the encoder 476 * has to read, modify, and rewrite the metadata (e.g. seekpoints) gathered 477 * while encoding. The address of the buffer to be filled is supplied, along 478 * with the number of bytes the buffer can hold. The callback may choose to 479 * supply less data and modify the byte count but must be careful not to 480 * overflow the buffer. The callback then returns a status code chosen from 481 * FLAC__StreamEncoderReadStatus. 482 * 483 * Here is an example of a read callback for stdio streams: 484 * \code 485 * FLAC__StreamEncoderReadStatus read_cb(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data) 486 * { 487 * FILE *file = ((MyClientData*)client_data)->file; 488 * if(*bytes > 0) { 489 * *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, file); 490 * if(ferror(file)) 491 * return FLAC__STREAM_ENCODER_READ_STATUS_ABORT; 492 * else if(*bytes == 0) 493 * return FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM; 494 * else 495 * return FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE; 496 * } 497 * else 498 * return FLAC__STREAM_ENCODER_READ_STATUS_ABORT; 499 * } 500 * \endcode 501 * 502 * \note In general, FLAC__StreamEncoder functions which change the 503 * state should not be called on the \a encoder while in the callback. 504 * 505 * \param encoder The encoder instance calling the callback. 506 * \param buffer A pointer to a location for the callee to store 507 * data to be encoded. 508 * \param bytes A pointer to the size of the buffer. On entry 509 * to the callback, it contains the maximum number 510 * of bytes that may be stored in \a buffer. The 511 * callee must set it to the actual number of bytes 512 * stored (0 in case of error or end-of-stream) before 513 * returning. 514 * \param client_data The callee's client data set through 515 * FLAC__stream_encoder_set_client_data(). 516 * \retval FLAC__StreamEncoderReadStatus 517 * The callee's return status. 518 */ 519 typedef FLAC__StreamEncoderReadStatus (*FLAC__StreamEncoderReadCallback)(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data); 520 521 /** Signature for the write callback. 522 * 523 * A function pointer matching this signature must be passed to 524 * FLAC__stream_encoder_init*_stream(). The supplied function will be called 525 * by the encoder anytime there is raw encoded data ready to write. It may 526 * include metadata mixed with encoded audio frames and the data is not 527 * guaranteed to be aligned on frame or metadata block boundaries. 528 * 529 * The only duty of the callback is to write out the \a bytes worth of data 530 * in \a buffer to the current position in the output stream. The arguments 531 * \a samples and \a current_frame are purely informational. If \a samples 532 * is greater than \c 0, then \a current_frame will hold the current frame 533 * number that is being written; otherwise it indicates that the write 534 * callback is being called to write metadata. 535 * 536 * \note 537 * Unlike when writing to native FLAC, when writing to Ogg FLAC the 538 * write callback will be called twice when writing each audio 539 * frame; once for the page header, and once for the page body. 540 * When writing the page header, the \a samples argument to the 541 * write callback will be \c 0. 542 * 543 * \note In general, FLAC__StreamEncoder functions which change the 544 * state should not be called on the \a encoder while in the callback. 545 * 546 * \param encoder The encoder instance calling the callback. 547 * \param buffer An array of encoded data of length \a bytes. 548 * \param bytes The byte length of \a buffer. 549 * \param samples The number of samples encoded by \a buffer. 550 * \c 0 has a special meaning; see above. 551 * \param current_frame The number of the current frame being encoded. 552 * \param client_data The callee's client data set through 553 * FLAC__stream_encoder_init_*(). 554 * \retval FLAC__StreamEncoderWriteStatus 555 * The callee's return status. 556 */ 557 typedef FLAC__StreamEncoderWriteStatus (*FLAC__StreamEncoderWriteCallback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data); 558 559 /** Signature for the seek callback. 560 * 561 * A function pointer matching this signature may be passed to 562 * FLAC__stream_encoder_init*_stream(). The supplied function will be called 563 * when the encoder needs to seek the output stream. The encoder will pass 564 * the absolute byte offset to seek to, 0 meaning the beginning of the stream. 565 * 566 * Here is an example of a seek callback for stdio streams: 567 * \code 568 * FLAC__StreamEncoderSeekStatus seek_cb(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data) 569 * { 570 * FILE *file = ((MyClientData*)client_data)->file; 571 * if(file == stdin) 572 * return FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED; 573 * else if(fseeko(file, (off_t)absolute_byte_offset, SEEK_SET) < 0) 574 * return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR; 575 * else 576 * return FLAC__STREAM_ENCODER_SEEK_STATUS_OK; 577 * } 578 * \endcode 579 * 580 * \note In general, FLAC__StreamEncoder functions which change the 581 * state should not be called on the \a encoder while in the callback. 582 * 583 * \param encoder The encoder instance calling the callback. 584 * \param absolute_byte_offset The offset from the beginning of the stream 585 * to seek to. 586 * \param client_data The callee's client data set through 587 * FLAC__stream_encoder_init_*(). 588 * \retval FLAC__StreamEncoderSeekStatus 589 * The callee's return status. 590 */ 591 typedef FLAC__StreamEncoderSeekStatus (*FLAC__StreamEncoderSeekCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data); 592 593 /** Signature for the tell callback. 594 * 595 * A function pointer matching this signature may be passed to 596 * FLAC__stream_encoder_init*_stream(). The supplied function will be called 597 * when the encoder needs to know the current position of the output stream. 598 * 599 * \warning 600 * The callback must return the true current byte offset of the output to 601 * which the encoder is writing. If you are buffering the output, make 602 * sure and take this into account. If you are writing directly to a 603 * FILE* from your write callback, ftell() is sufficient. If you are 604 * writing directly to a file descriptor from your write callback, you 605 * can use lseek(fd, SEEK_CUR, 0). The encoder may later seek back to 606 * these points to rewrite metadata after encoding. 607 * 608 * Here is an example of a tell callback for stdio streams: 609 * \code 610 * FLAC__StreamEncoderTellStatus tell_cb(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data) 611 * { 612 * FILE *file = ((MyClientData*)client_data)->file; 613 * off_t pos; 614 * if(file == stdin) 615 * return FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED; 616 * else if((pos = ftello(file)) < 0) 617 * return FLAC__STREAM_ENCODER_TELL_STATUS_ERROR; 618 * else { 619 * *absolute_byte_offset = (FLAC__uint64)pos; 620 * return FLAC__STREAM_ENCODER_TELL_STATUS_OK; 621 * } 622 * } 623 * \endcode 624 * 625 * \note In general, FLAC__StreamEncoder functions which change the 626 * state should not be called on the \a encoder while in the callback. 627 * 628 * \param encoder The encoder instance calling the callback. 629 * \param absolute_byte_offset The address at which to store the current 630 * position of the output. 631 * \param client_data The callee's client data set through 632 * FLAC__stream_encoder_init_*(). 633 * \retval FLAC__StreamEncoderTellStatus 634 * The callee's return status. 635 */ 636 typedef FLAC__StreamEncoderTellStatus (*FLAC__StreamEncoderTellCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data); 637 638 /** Signature for the metadata callback. 639 * 640 * A function pointer matching this signature may be passed to 641 * FLAC__stream_encoder_init*_stream(). The supplied function will be called 642 * once at the end of encoding with the populated STREAMINFO structure. This 643 * is so the client can seek back to the beginning of the file and write the 644 * STREAMINFO block with the correct statistics after encoding (like 645 * minimum/maximum frame size and total samples). 646 * 647 * \note In general, FLAC__StreamEncoder functions which change the 648 * state should not be called on the \a encoder while in the callback. 649 * 650 * \param encoder The encoder instance calling the callback. 651 * \param metadata The final populated STREAMINFO block. 652 * \param client_data The callee's client data set through 653 * FLAC__stream_encoder_init_*(). 654 */ 655 typedef void (*FLAC__StreamEncoderMetadataCallback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data); 656 657 /** Signature for the progress callback. 658 * 659 * A function pointer matching this signature may be passed to 660 * FLAC__stream_encoder_init*_file() or FLAC__stream_encoder_init*_FILE(). 661 * The supplied function will be called when the encoder has finished 662 * writing a frame. The \c total_frames_estimate argument to the 663 * callback will be based on the value from 664 * FLAC__stream_encoder_set_total_samples_estimate(). 665 * 666 * \note In general, FLAC__StreamEncoder functions which change the 667 * state should not be called on the \a encoder while in the callback. 668 * 669 * \param encoder The encoder instance calling the callback. 670 * \param bytes_written Bytes written so far. 671 * \param samples_written Samples written so far. 672 * \param frames_written Frames written so far. 673 * \param total_frames_estimate The estimate of the total number of 674 * frames to be written. 675 * \param client_data The callee's client data set through 676 * FLAC__stream_encoder_init_*(). 677 */ 678 typedef void (*FLAC__StreamEncoderProgressCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate, void *client_data); 679 680 681 /*********************************************************************** 682 * 683 * Class constructor/destructor 684 * 685 ***********************************************************************/ 686 687 /** Create a new stream encoder instance. The instance is created with 688 * default settings; see the individual FLAC__stream_encoder_set_*() 689 * functions for each setting's default. 690 * 691 * \retval FLAC__StreamEncoder* 692 * \c NULL if there was an error allocating memory, else the new instance. 693 */ 694 FLAC_API FLAC__StreamEncoder *FLAC__stream_encoder_new(void); 695 696 /** Free an encoder instance. Deletes the object pointed to by \a encoder. 697 * 698 * \param encoder A pointer to an existing encoder. 699 * \assert 700 * \code encoder != NULL \endcode 701 */ 702 FLAC_API void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder); 703 704 705 /*********************************************************************** 706 * 707 * Public class method prototypes 708 * 709 ***********************************************************************/ 710 711 /** Set the serial number for the FLAC stream to use in the Ogg container. 712 * 713 * \note 714 * This does not need to be set for native FLAC encoding. 715 * 716 * \note 717 * It is recommended to set a serial number explicitly as the default of '0' 718 * may collide with other streams. 719 * 720 * \default \c 0 721 * \param encoder An encoder instance to set. 722 * \param serial_number See above. 723 * \assert 724 * \code encoder != NULL \endcode 725 * \retval FLAC__bool 726 * \c false if the encoder is already initialized, else \c true. 727 */ 728 FLAC_API FLAC__bool FLAC__stream_encoder_set_ogg_serial_number(FLAC__StreamEncoder *encoder, long serial_number); 729 730 /** Set the "verify" flag. If \c true, the encoder will verify it's own 731 * encoded output by feeding it through an internal decoder and comparing 732 * the original signal against the decoded signal. If a mismatch occurs, 733 * the process call will return \c false. Note that this will slow the 734 * encoding process by the extra time required for decoding and comparison. 735 * 736 * \default \c false 737 * \param encoder An encoder instance to set. 738 * \param value Flag value (see above). 739 * \assert 740 * \code encoder != NULL \endcode 741 * \retval FLAC__bool 742 * \c false if the encoder is already initialized, else \c true. 743 */ 744 FLAC_API FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value); 745 746 /** Set the <A HREF="../format.html#subset">Subset</A> flag. If \c true, 747 * the encoder will comply with the Subset and will check the 748 * settings during FLAC__stream_encoder_init_*() to see if all settings 749 * comply. If \c false, the settings may take advantage of the full 750 * range that the format allows. 751 * 752 * Make sure you know what it entails before setting this to \c false. 753 * 754 * \default \c true 755 * \param encoder An encoder instance to set. 756 * \param value Flag value (see above). 757 * \assert 758 * \code encoder != NULL \endcode 759 * \retval FLAC__bool 760 * \c false if the encoder is already initialized, else \c true. 761 */ 762 FLAC_API FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value); 763 764 /** Set the number of channels to be encoded. 765 * 766 * \default \c 2 767 * \param encoder An encoder instance to set. 768 * \param value See above. 769 * \assert 770 * \code encoder != NULL \endcode 771 * \retval FLAC__bool 772 * \c false if the encoder is already initialized, else \c true. 773 */ 774 FLAC_API FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value); 775 776 /** Set the sample resolution of the input to be encoded. 777 * 778 * \warning 779 * Do not feed the encoder data that is wider than the value you 780 * set here or you will generate an invalid stream. 781 * 782 * \default \c 16 783 * \param encoder An encoder instance to set. 784 * \param value See above. 785 * \assert 786 * \code encoder != NULL \endcode 787 * \retval FLAC__bool 788 * \c false if the encoder is already initialized, else \c true. 789 */ 790 FLAC_API FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value); 791 792 /** Set the sample rate (in Hz) of the input to be encoded. 793 * 794 * \default \c 44100 795 * \param encoder An encoder instance to set. 796 * \param value See above. 797 * \assert 798 * \code encoder != NULL \endcode 799 * \retval FLAC__bool 800 * \c false if the encoder is already initialized, else \c true. 801 */ 802 FLAC_API FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value); 803 804 /** Set the compression level 805 * 806 * The compression level is roughly proportional to the amount of effort 807 * the encoder expends to compress the file. A higher level usually 808 * means more computation but higher compression. The default level is 809 * suitable for most applications. 810 * 811 * Currently the levels range from \c 0 (fastest, least compression) to 812 * \c 8 (slowest, most compression). A value larger than \c 8 will be 813 * treated as \c 8. 814 * 815 * This function automatically calls the following other \c _set_ 816 * functions with appropriate values, so the client does not need to 817 * unless it specifically wants to override them: 818 * - FLAC__stream_encoder_set_do_mid_side_stereo() 819 * - FLAC__stream_encoder_set_loose_mid_side_stereo() 820 * - FLAC__stream_encoder_set_apodization() 821 * - FLAC__stream_encoder_set_max_lpc_order() 822 * - FLAC__stream_encoder_set_qlp_coeff_precision() 823 * - FLAC__stream_encoder_set_do_qlp_coeff_prec_search() 824 * - FLAC__stream_encoder_set_do_escape_coding() 825 * - FLAC__stream_encoder_set_do_exhaustive_model_search() 826 * - FLAC__stream_encoder_set_min_residual_partition_order() 827 * - FLAC__stream_encoder_set_max_residual_partition_order() 828 * - FLAC__stream_encoder_set_rice_parameter_search_dist() 829 * 830 * The actual values set for each level are: 831 * <table> 832 * <tr> 833 * <td><b>level</b></td> 834 * <td>do mid-side stereo</td> 835 * <td>loose mid-side stereo</td> 836 * <td>apodization</td> 837 * <td>max lpc order</td> 838 * <td>qlp coeff precision</td> 839 * <td>qlp coeff prec search</td> 840 * <td>escape coding</td> 841 * <td>exhaustive model search</td> 842 * <td>min residual partition order</td> 843 * <td>max residual partition order</td> 844 * <td>rice parameter search dist</td> 845 * </tr> 846 * <tr> <td><b>0</b></td> <td>false</td> <td>false</td> <td>tukey(0.5)<td> <td>0</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>3</td> <td>0</td> </tr> 847 * <tr> <td><b>1</b></td> <td>true</td> <td>true</td> <td>tukey(0.5)<td> <td>0</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>3</td> <td>0</td> </tr> 848 * <tr> <td><b>2</b></td> <td>true</td> <td>false</td> <td>tukey(0.5)<td> <td>0</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>3</td> <td>0</td> </tr> 849 * <tr> <td><b>3</b></td> <td>false</td> <td>false</td> <td>tukey(0.5)<td> <td>6</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>4</td> <td>0</td> </tr> 850 * <tr> <td><b>4</b></td> <td>true</td> <td>true</td> <td>tukey(0.5)<td> <td>8</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>4</td> <td>0</td> </tr> 851 * <tr> <td><b>5</b></td> <td>true</td> <td>false</td> <td>tukey(0.5)<td> <td>8</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>5</td> <td>0</td> </tr> 852 * <tr> <td><b>6</b></td> <td>true</td> <td>false</td> <td>tukey(0.5);partial_tukey(2)<td> <td>8</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>6</td> <td>0</td> </tr> 853 * <tr> <td><b>7</b></td> <td>true</td> <td>false</td> <td>tukey(0.5);partial_tukey(2)<td> <td>12</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>6</td> <td>0</td> </tr> 854 * <tr> <td><b>8</b></td> <td>true</td> <td>false</td> <td>tukey(0.5);partial_tukey(2);punchout_tukey(3)</td> <td>12</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>6</td> <td>0</td> </tr> 855 * </table> 856 * 857 * \default \c 5 858 * \param encoder An encoder instance to set. 859 * \param value See above. 860 * \assert 861 * \code encoder != NULL \endcode 862 * \retval FLAC__bool 863 * \c false if the encoder is already initialized, else \c true. 864 */ 865 FLAC_API FLAC__bool FLAC__stream_encoder_set_compression_level(FLAC__StreamEncoder *encoder, unsigned value); 866 867 /** Set the blocksize to use while encoding. 868 * 869 * The number of samples to use per frame. Use \c 0 to let the encoder 870 * estimate a blocksize; this is usually best. 871 * 872 * \default \c 0 873 * \param encoder An encoder instance to set. 874 * \param value See above. 875 * \assert 876 * \code encoder != NULL \endcode 877 * \retval FLAC__bool 878 * \c false if the encoder is already initialized, else \c true. 879 */ 880 FLAC_API FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value); 881 882 /** Set to \c true to enable mid-side encoding on stereo input. The 883 * number of channels must be 2 for this to have any effect. Set to 884 * \c false to use only independent channel coding. 885 * 886 * \default \c false 887 * \param encoder An encoder instance to set. 888 * \param value Flag value (see above). 889 * \assert 890 * \code encoder != NULL \endcode 891 * \retval FLAC__bool 892 * \c false if the encoder is already initialized, else \c true. 893 */ 894 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value); 895 896 /** Set to \c true to enable adaptive switching between mid-side and 897 * left-right encoding on stereo input. Set to \c false to use 898 * exhaustive searching. Setting this to \c true requires 899 * FLAC__stream_encoder_set_do_mid_side_stereo() to also be set to 900 * \c true in order to have any effect. 901 * 902 * \default \c false 903 * \param encoder An encoder instance to set. 904 * \param value Flag value (see above). 905 * \assert 906 * \code encoder != NULL \endcode 907 * \retval FLAC__bool 908 * \c false if the encoder is already initialized, else \c true. 909 */ 910 FLAC_API FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value); 911 912 /** Sets the apodization function(s) the encoder will use when windowing 913 * audio data for LPC analysis. 914 * 915 * The \a specification is a plain ASCII string which specifies exactly 916 * which functions to use. There may be more than one (up to 32), 917 * separated by \c ';' characters. Some functions take one or more 918 * comma-separated arguments in parentheses. 919 * 920 * The available functions are \c bartlett, \c bartlett_hann, 921 * \c blackman, \c blackman_harris_4term_92db, \c connes, \c flattop, 922 * \c gauss(STDDEV), \c hamming, \c hann, \c kaiser_bessel, \c nuttall, 923 * \c rectangle, \c triangle, \c tukey(P), \c partial_tukey(n[/ov[/P]]), 924 * \c punchout_tukey(n[/ov[/P]]), \c welch. 925 * 926 * For \c gauss(STDDEV), STDDEV specifies the standard deviation 927 * (0<STDDEV<=0.5). 928 * 929 * For \c tukey(P), P specifies the fraction of the window that is 930 * tapered (0<=P<=1). P=0 corresponds to \c rectangle and P=1 931 * corresponds to \c hann. 932 * 933 * Specifying \c partial_tukey or \c punchout_tukey works a little 934 * different. These do not specify a single apodization function, but 935 * a series of them with some overlap. partial_tukey specifies a series 936 * of small windows (all treated separately) while punchout_tukey 937 * specifies a series of windows that have a hole in them. In this way, 938 * the predictor is constructed with only a part of the block, which 939 * helps in case a block consists of dissimilar parts. 940 * 941 * The three parameters that can be specified for the functions are 942 * n, ov and P. n is the number of functions to add, ov is the overlap 943 * of the windows in case of partial_tukey and the overlap in the gaps 944 * in case of punchout_tukey. P is the fraction of the window that is 945 * tapered, like with a regular tukey window. The function can be 946 * specified with only a number, a number and an overlap, or a number 947 * an overlap and a P, for example, partial_tukey(3), partial_tukey(3/0.3) 948 * and partial_tukey(3/0.3/0.5) are all valid. ov should be smaller than 1 949 * and can be negative. 950 * 951 * Example specifications are \c "blackman" or 952 * \c "hann;triangle;tukey(0.5);tukey(0.25);tukey(0.125)" 953 * 954 * Any function that is specified erroneously is silently dropped. Up 955 * to 32 functions are kept, the rest are dropped. If the specification 956 * is empty the encoder defaults to \c "tukey(0.5)". 957 * 958 * When more than one function is specified, then for every subframe the 959 * encoder will try each of them separately and choose the window that 960 * results in the smallest compressed subframe. 961 * 962 * Note that each function specified causes the encoder to occupy a 963 * floating point array in which to store the window. Also note that the 964 * values of P, STDDEV and ov are locale-specific, so if the comma 965 * separator specified by the locale is a comma, a comma should be used. 966 * 967 * \default \c "tukey(0.5)" 968 * \param encoder An encoder instance to set. 969 * \param specification See above. 970 * \assert 971 * \code encoder != NULL \endcode 972 * \code specification != NULL \endcode 973 * \retval FLAC__bool 974 * \c false if the encoder is already initialized, else \c true. 975 */ 976 FLAC_API FLAC__bool FLAC__stream_encoder_set_apodization(FLAC__StreamEncoder *encoder, const char *specification); 977 978 /** Set the maximum LPC order, or \c 0 to use only the fixed predictors. 979 * 980 * \default \c 0 981 * \param encoder An encoder instance to set. 982 * \param value See above. 983 * \assert 984 * \code encoder != NULL \endcode 985 * \retval FLAC__bool 986 * \c false if the encoder is already initialized, else \c true. 987 */ 988 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value); 989 990 /** Set the precision, in bits, of the quantized linear predictor 991 * coefficients, or \c 0 to let the encoder select it based on the 992 * blocksize. 993 * 994 * \note 995 * In the current implementation, qlp_coeff_precision + bits_per_sample must 996 * be less than 32. 997 * 998 * \default \c 0 999 * \param encoder An encoder instance to set. 1000 * \param value See above. 1001 * \assert 1002 * \code encoder != NULL \endcode 1003 * \retval FLAC__bool 1004 * \c false if the encoder is already initialized, else \c true. 1005 */ 1006 FLAC_API FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value); 1007 1008 /** Set to \c false to use only the specified quantized linear predictor 1009 * coefficient precision, or \c true to search neighboring precision 1010 * values and use the best one. 1011 * 1012 * \default \c false 1013 * \param encoder An encoder instance to set. 1014 * \param value See above. 1015 * \assert 1016 * \code encoder != NULL \endcode 1017 * \retval FLAC__bool 1018 * \c false if the encoder is already initialized, else \c true. 1019 */ 1020 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value); 1021 1022 /** Deprecated. Setting this value has no effect. 1023 * 1024 * \default \c false 1025 * \param encoder An encoder instance to set. 1026 * \param value See above. 1027 * \assert 1028 * \code encoder != NULL \endcode 1029 * \retval FLAC__bool 1030 * \c false if the encoder is already initialized, else \c true. 1031 */ 1032 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value); 1033 1034 /** Set to \c false to let the encoder estimate the best model order 1035 * based on the residual signal energy, or \c true to force the 1036 * encoder to evaluate all order models and select the best. 1037 * 1038 * \default \c false 1039 * \param encoder An encoder instance to set. 1040 * \param value See above. 1041 * \assert 1042 * \code encoder != NULL \endcode 1043 * \retval FLAC__bool 1044 * \c false if the encoder is already initialized, else \c true. 1045 */ 1046 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value); 1047 1048 /** Set the minimum partition order to search when coding the residual. 1049 * This is used in tandem with 1050 * FLAC__stream_encoder_set_max_residual_partition_order(). 1051 * 1052 * The partition order determines the context size in the residual. 1053 * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>. 1054 * 1055 * Set both min and max values to \c 0 to force a single context, 1056 * whose Rice parameter is based on the residual signal variance. 1057 * Otherwise, set a min and max order, and the encoder will search 1058 * all orders, using the mean of each context for its Rice parameter, 1059 * and use the best. 1060 * 1061 * \default \c 0 1062 * \param encoder An encoder instance to set. 1063 * \param value See above. 1064 * \assert 1065 * \code encoder != NULL \endcode 1066 * \retval FLAC__bool 1067 * \c false if the encoder is already initialized, else \c true. 1068 */ 1069 FLAC_API FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value); 1070 1071 /** Set the maximum partition order to search when coding the residual. 1072 * This is used in tandem with 1073 * FLAC__stream_encoder_set_min_residual_partition_order(). 1074 * 1075 * The partition order determines the context size in the residual. 1076 * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>. 1077 * 1078 * Set both min and max values to \c 0 to force a single context, 1079 * whose Rice parameter is based on the residual signal variance. 1080 * Otherwise, set a min and max order, and the encoder will search 1081 * all orders, using the mean of each context for its Rice parameter, 1082 * and use the best. 1083 * 1084 * \default \c 0 1085 * \param encoder An encoder instance to set. 1086 * \param value See above. 1087 * \assert 1088 * \code encoder != NULL \endcode 1089 * \retval FLAC__bool 1090 * \c false if the encoder is already initialized, else \c true. 1091 */ 1092 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value); 1093 1094 /** Deprecated. Setting this value has no effect. 1095 * 1096 * \default \c 0 1097 * \param encoder An encoder instance to set. 1098 * \param value See above. 1099 * \assert 1100 * \code encoder != NULL \endcode 1101 * \retval FLAC__bool 1102 * \c false if the encoder is already initialized, else \c true. 1103 */ 1104 FLAC_API FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value); 1105 1106 /** Set an estimate of the total samples that will be encoded. 1107 * This is merely an estimate and may be set to \c 0 if unknown. 1108 * This value will be written to the STREAMINFO block before encoding, 1109 * and can remove the need for the caller to rewrite the value later 1110 * if the value is known before encoding. 1111 * 1112 * \default \c 0 1113 * \param encoder An encoder instance to set. 1114 * \param value See above. 1115 * \assert 1116 * \code encoder != NULL \endcode 1117 * \retval FLAC__bool 1118 * \c false if the encoder is already initialized, else \c true. 1119 */ 1120 FLAC_API FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value); 1121 1122 /** Set the metadata blocks to be emitted to the stream before encoding. 1123 * A value of \c NULL, \c 0 implies no metadata; otherwise, supply an 1124 * array of pointers to metadata blocks. The array is non-const since 1125 * the encoder may need to change the \a is_last flag inside them, and 1126 * in some cases update seek point offsets. Otherwise, the encoder will 1127 * not modify or free the blocks. It is up to the caller to free the 1128 * metadata blocks after encoding finishes. 1129 * 1130 * \note 1131 * The encoder stores only copies of the pointers in the \a metadata array; 1132 * the metadata blocks themselves must survive at least until after 1133 * FLAC__stream_encoder_finish() returns. Do not free the blocks until then. 1134 * 1135 * \note 1136 * The STREAMINFO block is always written and no STREAMINFO block may 1137 * occur in the supplied array. 1138 * 1139 * \note 1140 * By default the encoder does not create a SEEKTABLE. If one is supplied 1141 * in the \a metadata array, but the client has specified that it does not 1142 * support seeking, then the SEEKTABLE will be written verbatim. However 1143 * by itself this is not very useful as the client will not know the stream 1144 * offsets for the seekpoints ahead of time. In order to get a proper 1145 * seektable the client must support seeking. See next note. 1146 * 1147 * \note 1148 * SEEKTABLE blocks are handled specially. Since you will not know 1149 * the values for the seek point stream offsets, you should pass in 1150 * a SEEKTABLE 'template', that is, a SEEKTABLE object with the 1151 * required sample numbers (or placeholder points), with \c 0 for the 1152 * \a frame_samples and \a stream_offset fields for each point. If the 1153 * client has specified that it supports seeking by providing a seek 1154 * callback to FLAC__stream_encoder_init_stream() or both seek AND read 1155 * callback to FLAC__stream_encoder_init_ogg_stream() (or by using 1156 * FLAC__stream_encoder_init*_file() or FLAC__stream_encoder_init*_FILE()), 1157 * then while it is encoding the encoder will fill the stream offsets in 1158 * for you and when encoding is finished, it will seek back and write the 1159 * real values into the SEEKTABLE block in the stream. There are helper 1160 * routines for manipulating seektable template blocks; see metadata.h: 1161 * FLAC__metadata_object_seektable_template_*(). If the client does 1162 * not support seeking, the SEEKTABLE will have inaccurate offsets which 1163 * will slow down or remove the ability to seek in the FLAC stream. 1164 * 1165 * \note 1166 * The encoder instance \b will modify the first \c SEEKTABLE block 1167 * as it transforms the template to a valid seektable while encoding, 1168 * but it is still up to the caller to free all metadata blocks after 1169 * encoding. 1170 * 1171 * \note 1172 * A VORBIS_COMMENT block may be supplied. The vendor string in it 1173 * will be ignored. libFLAC will use it's own vendor string. libFLAC 1174 * will not modify the passed-in VORBIS_COMMENT's vendor string, it 1175 * will simply write it's own into the stream. If no VORBIS_COMMENT 1176 * block is present in the \a metadata array, libFLAC will write an 1177 * empty one, containing only the vendor string. 1178 * 1179 * \note The Ogg FLAC mapping requires that the VORBIS_COMMENT block be 1180 * the second metadata block of the stream. The encoder already supplies 1181 * the STREAMINFO block automatically. If \a metadata does not contain a 1182 * VORBIS_COMMENT block, the encoder will supply that too. Otherwise, if 1183 * \a metadata does contain a VORBIS_COMMENT block and it is not the 1184 * first, the init function will reorder \a metadata by moving the 1185 * VORBIS_COMMENT block to the front; the relative ordering of the other 1186 * blocks will remain as they were. 1187 * 1188 * \note The Ogg FLAC mapping limits the number of metadata blocks per 1189 * stream to \c 65535. If \a num_blocks exceeds this the function will 1190 * return \c false. 1191 * 1192 * \default \c NULL, 0 1193 * \param encoder An encoder instance to set. 1194 * \param metadata See above. 1195 * \param num_blocks See above. 1196 * \assert 1197 * \code encoder != NULL \endcode 1198 * \retval FLAC__bool 1199 * \c false if the encoder is already initialized, else \c true. 1200 * \c false if the encoder is already initialized, or if 1201 * \a num_blocks > 65535 if encoding to Ogg FLAC, else \c true. 1202 */ 1203 FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks); 1204 1205 /** Get the current encoder state. 1206 * 1207 * \param encoder An encoder instance to query. 1208 * \assert 1209 * \code encoder != NULL \endcode 1210 * \retval FLAC__StreamEncoderState 1211 * The current encoder state. 1212 */ 1213 FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder); 1214 1215 /** Get the state of the verify stream decoder. 1216 * Useful when the stream encoder state is 1217 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR. 1218 * 1219 * \param encoder An encoder instance to query. 1220 * \assert 1221 * \code encoder != NULL \endcode 1222 * \retval FLAC__StreamDecoderState 1223 * The verify stream decoder state. 1224 */ 1225 FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder); 1226 1227 /** Get the current encoder state as a C string. 1228 * This version automatically resolves 1229 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR by getting the 1230 * verify decoder's state. 1231 * 1232 * \param encoder A encoder instance to query. 1233 * \assert 1234 * \code encoder != NULL \endcode 1235 * \retval const char * 1236 * The encoder state as a C string. Do not modify the contents. 1237 */ 1238 FLAC_API const char *FLAC__stream_encoder_get_resolved_state_string(const FLAC__StreamEncoder *encoder); 1239 1240 /** Get relevant values about the nature of a verify decoder error. 1241 * Useful when the stream encoder state is 1242 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR. The arguments should 1243 * be addresses in which the stats will be returned, or NULL if value 1244 * is not desired. 1245 * 1246 * \param encoder An encoder instance to query. 1247 * \param absolute_sample The absolute sample number of the mismatch. 1248 * \param frame_number The number of the frame in which the mismatch occurred. 1249 * \param channel The channel in which the mismatch occurred. 1250 * \param sample The number of the sample (relative to the frame) in 1251 * which the mismatch occurred. 1252 * \param expected The expected value for the sample in question. 1253 * \param got The actual value returned by the decoder. 1254 * \assert 1255 * \code encoder != NULL \endcode 1256 */ 1257 FLAC_API void FLAC__stream_encoder_get_verify_decoder_error_stats(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_sample, unsigned *frame_number, unsigned *channel, unsigned *sample, FLAC__int32 *expected, FLAC__int32 *got); 1258 1259 /** Get the "verify" flag. 1260 * 1261 * \param encoder An encoder instance to query. 1262 * \assert 1263 * \code encoder != NULL \endcode 1264 * \retval FLAC__bool 1265 * See FLAC__stream_encoder_set_verify(). 1266 */ 1267 FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder); 1268 1269 /** Get the <A HREF="../format.html#subset>Subset</A> flag. 1270 * 1271 * \param encoder An encoder instance to query. 1272 * \assert 1273 * \code encoder != NULL \endcode 1274 * \retval FLAC__bool 1275 * See FLAC__stream_encoder_set_streamable_subset(). 1276 */ 1277 FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder); 1278 1279 /** Get the number of input channels being processed. 1280 * 1281 * \param encoder An encoder instance to query. 1282 * \assert 1283 * \code encoder != NULL \endcode 1284 * \retval unsigned 1285 * See FLAC__stream_encoder_set_channels(). 1286 */ 1287 FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder); 1288 1289 /** Get the input sample resolution setting. 1290 * 1291 * \param encoder An encoder instance to query. 1292 * \assert 1293 * \code encoder != NULL \endcode 1294 * \retval unsigned 1295 * See FLAC__stream_encoder_set_bits_per_sample(). 1296 */ 1297 FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder); 1298 1299 /** Get the input sample rate setting. 1300 * 1301 * \param encoder An encoder instance to query. 1302 * \assert 1303 * \code encoder != NULL \endcode 1304 * \retval unsigned 1305 * See FLAC__stream_encoder_set_sample_rate(). 1306 */ 1307 FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder); 1308 1309 /** Get the blocksize setting. 1310 * 1311 * \param encoder An encoder instance to query. 1312 * \assert 1313 * \code encoder != NULL \endcode 1314 * \retval unsigned 1315 * See FLAC__stream_encoder_set_blocksize(). 1316 */ 1317 FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder); 1318 1319 /** Get the "mid/side stereo coding" flag. 1320 * 1321 * \param encoder An encoder instance to query. 1322 * \assert 1323 * \code encoder != NULL \endcode 1324 * \retval FLAC__bool 1325 * See FLAC__stream_encoder_get_do_mid_side_stereo(). 1326 */ 1327 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder); 1328 1329 /** Get the "adaptive mid/side switching" flag. 1330 * 1331 * \param encoder An encoder instance to query. 1332 * \assert 1333 * \code encoder != NULL \endcode 1334 * \retval FLAC__bool 1335 * See FLAC__stream_encoder_set_loose_mid_side_stereo(). 1336 */ 1337 FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder); 1338 1339 /** Get the maximum LPC order setting. 1340 * 1341 * \param encoder An encoder instance to query. 1342 * \assert 1343 * \code encoder != NULL \endcode 1344 * \retval unsigned 1345 * See FLAC__stream_encoder_set_max_lpc_order(). 1346 */ 1347 FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder); 1348 1349 /** Get the quantized linear predictor coefficient precision setting. 1350 * 1351 * \param encoder An encoder instance to query. 1352 * \assert 1353 * \code encoder != NULL \endcode 1354 * \retval unsigned 1355 * See FLAC__stream_encoder_set_qlp_coeff_precision(). 1356 */ 1357 FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder); 1358 1359 /** Get the qlp coefficient precision search flag. 1360 * 1361 * \param encoder An encoder instance to query. 1362 * \assert 1363 * \code encoder != NULL \endcode 1364 * \retval FLAC__bool 1365 * See FLAC__stream_encoder_set_do_qlp_coeff_prec_search(). 1366 */ 1367 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder); 1368 1369 /** Get the "escape coding" flag. 1370 * 1371 * \param encoder An encoder instance to query. 1372 * \assert 1373 * \code encoder != NULL \endcode 1374 * \retval FLAC__bool 1375 * See FLAC__stream_encoder_set_do_escape_coding(). 1376 */ 1377 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder); 1378 1379 /** Get the exhaustive model search flag. 1380 * 1381 * \param encoder An encoder instance to query. 1382 * \assert 1383 * \code encoder != NULL \endcode 1384 * \retval FLAC__bool 1385 * See FLAC__stream_encoder_set_do_exhaustive_model_search(). 1386 */ 1387 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder); 1388 1389 /** Get the minimum residual partition order setting. 1390 * 1391 * \param encoder An encoder instance to query. 1392 * \assert 1393 * \code encoder != NULL \endcode 1394 * \retval unsigned 1395 * See FLAC__stream_encoder_set_min_residual_partition_order(). 1396 */ 1397 FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder); 1398 1399 /** Get maximum residual partition order setting. 1400 * 1401 * \param encoder An encoder instance to query. 1402 * \assert 1403 * \code encoder != NULL \endcode 1404 * \retval unsigned 1405 * See FLAC__stream_encoder_set_max_residual_partition_order(). 1406 */ 1407 FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder); 1408 1409 /** Get the Rice parameter search distance setting. 1410 * 1411 * \param encoder An encoder instance to query. 1412 * \assert 1413 * \code encoder != NULL \endcode 1414 * \retval unsigned 1415 * See FLAC__stream_encoder_set_rice_parameter_search_dist(). 1416 */ 1417 FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder); 1418 1419 /** Get the previously set estimate of the total samples to be encoded. 1420 * The encoder merely mimics back the value given to 1421 * FLAC__stream_encoder_set_total_samples_estimate() since it has no 1422 * other way of knowing how many samples the client will encode. 1423 * 1424 * \param encoder An encoder instance to set. 1425 * \assert 1426 * \code encoder != NULL \endcode 1427 * \retval FLAC__uint64 1428 * See FLAC__stream_encoder_get_total_samples_estimate(). 1429 */ 1430 FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder); 1431 1432 /** Initialize the encoder instance to encode native FLAC streams. 1433 * 1434 * This flavor of initialization sets up the encoder to encode to a 1435 * native FLAC stream. I/O is performed via callbacks to the client. 1436 * For encoding to a plain file via filename or open \c FILE*, 1437 * FLAC__stream_encoder_init_file() and FLAC__stream_encoder_init_FILE() 1438 * provide a simpler interface. 1439 * 1440 * This function should be called after FLAC__stream_encoder_new() and 1441 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process() 1442 * or FLAC__stream_encoder_process_interleaved(). 1443 * initialization succeeded. 1444 * 1445 * The call to FLAC__stream_encoder_init_stream() currently will also 1446 * immediately call the write callback several times, once with the \c fLaC 1447 * signature, and once for each encoded metadata block. 1448 * 1449 * \param encoder An uninitialized encoder instance. 1450 * \param write_callback See FLAC__StreamEncoderWriteCallback. This 1451 * pointer must not be \c NULL. 1452 * \param seek_callback See FLAC__StreamEncoderSeekCallback. This 1453 * pointer may be \c NULL if seeking is not 1454 * supported. The encoder uses seeking to go back 1455 * and write some some stream statistics to the 1456 * STREAMINFO block; this is recommended but not 1457 * necessary to create a valid FLAC stream. If 1458 * \a seek_callback is not \c NULL then a 1459 * \a tell_callback must also be supplied. 1460 * Alternatively, a dummy seek callback that just 1461 * returns \c FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED 1462 * may also be supplied, all though this is slightly 1463 * less efficient for the encoder. 1464 * \param tell_callback See FLAC__StreamEncoderTellCallback. This 1465 * pointer may be \c NULL if seeking is not 1466 * supported. If \a seek_callback is \c NULL then 1467 * this argument will be ignored. If 1468 * \a seek_callback is not \c NULL then a 1469 * \a tell_callback must also be supplied. 1470 * Alternatively, a dummy tell callback that just 1471 * returns \c FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED 1472 * may also be supplied, all though this is slightly 1473 * less efficient for the encoder. 1474 * \param metadata_callback See FLAC__StreamEncoderMetadataCallback. This 1475 * pointer may be \c NULL if the callback is not 1476 * desired. If the client provides a seek callback, 1477 * this function is not necessary as the encoder 1478 * will automatically seek back and update the 1479 * STREAMINFO block. It may also be \c NULL if the 1480 * client does not support seeking, since it will 1481 * have no way of going back to update the 1482 * STREAMINFO. However the client can still supply 1483 * a callback if it would like to know the details 1484 * from the STREAMINFO. 1485 * \param client_data This value will be supplied to callbacks in their 1486 * \a client_data argument. 1487 * \assert 1488 * \code encoder != NULL \endcode 1489 * \retval FLAC__StreamEncoderInitStatus 1490 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful; 1491 * see FLAC__StreamEncoderInitStatus for the meanings of other return values. 1492 */ 1493 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_stream(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteCallback write_callback, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderTellCallback tell_callback, FLAC__StreamEncoderMetadataCallback metadata_callback, void *client_data); 1494 1495 /** Initialize the encoder instance to encode Ogg FLAC streams. 1496 * 1497 * This flavor of initialization sets up the encoder to encode to a FLAC 1498 * stream in an Ogg container. I/O is performed via callbacks to the 1499 * client. For encoding to a plain file via filename or open \c FILE*, 1500 * FLAC__stream_encoder_init_ogg_file() and FLAC__stream_encoder_init_ogg_FILE() 1501 * provide a simpler interface. 1502 * 1503 * This function should be called after FLAC__stream_encoder_new() and 1504 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process() 1505 * or FLAC__stream_encoder_process_interleaved(). 1506 * initialization succeeded. 1507 * 1508 * The call to FLAC__stream_encoder_init_ogg_stream() currently will also 1509 * immediately call the write callback several times to write the metadata 1510 * packets. 1511 * 1512 * \param encoder An uninitialized encoder instance. 1513 * \param read_callback See FLAC__StreamEncoderReadCallback. This 1514 * pointer must not be \c NULL if \a seek_callback 1515 * is non-NULL since they are both needed to be 1516 * able to write data back to the Ogg FLAC stream 1517 * in the post-encode phase. 1518 * \param write_callback See FLAC__StreamEncoderWriteCallback. This 1519 * pointer must not be \c NULL. 1520 * \param seek_callback See FLAC__StreamEncoderSeekCallback. This 1521 * pointer may be \c NULL if seeking is not 1522 * supported. The encoder uses seeking to go back 1523 * and write some some stream statistics to the 1524 * STREAMINFO block; this is recommended but not 1525 * necessary to create a valid FLAC stream. If 1526 * \a seek_callback is not \c NULL then a 1527 * \a tell_callback must also be supplied. 1528 * Alternatively, a dummy seek callback that just 1529 * returns \c FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED 1530 * may also be supplied, all though this is slightly 1531 * less efficient for the encoder. 1532 * \param tell_callback See FLAC__StreamEncoderTellCallback. This 1533 * pointer may be \c NULL if seeking is not 1534 * supported. If \a seek_callback is \c NULL then 1535 * this argument will be ignored. If 1536 * \a seek_callback is not \c NULL then a 1537 * \a tell_callback must also be supplied. 1538 * Alternatively, a dummy tell callback that just 1539 * returns \c FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED 1540 * may also be supplied, all though this is slightly 1541 * less efficient for the encoder. 1542 * \param metadata_callback See FLAC__StreamEncoderMetadataCallback. This 1543 * pointer may be \c NULL if the callback is not 1544 * desired. If the client provides a seek callback, 1545 * this function is not necessary as the encoder 1546 * will automatically seek back and update the 1547 * STREAMINFO block. It may also be \c NULL if the 1548 * client does not support seeking, since it will 1549 * have no way of going back to update the 1550 * STREAMINFO. However the client can still supply 1551 * a callback if it would like to know the details 1552 * from the STREAMINFO. 1553 * \param client_data This value will be supplied to callbacks in their 1554 * \a client_data argument. 1555 * \assert 1556 * \code encoder != NULL \endcode 1557 * \retval FLAC__StreamEncoderInitStatus 1558 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful; 1559 * see FLAC__StreamEncoderInitStatus for the meanings of other return values. 1560 */ 1561 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_stream(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderReadCallback read_callback, FLAC__StreamEncoderWriteCallback write_callback, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderTellCallback tell_callback, FLAC__StreamEncoderMetadataCallback metadata_callback, void *client_data); 1562 1563 /** Initialize the encoder instance to encode native FLAC files. 1564 * 1565 * This flavor of initialization sets up the encoder to encode to a 1566 * plain native FLAC file. For non-stdio streams, you must use 1567 * FLAC__stream_encoder_init_stream() and provide callbacks for the I/O. 1568 * 1569 * This function should be called after FLAC__stream_encoder_new() and 1570 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process() 1571 * or FLAC__stream_encoder_process_interleaved(). 1572 * initialization succeeded. 1573 * 1574 * \param encoder An uninitialized encoder instance. 1575 * \param file An open file. The file should have been opened 1576 * with mode \c "w+b" and rewound. The file 1577 * becomes owned by the encoder and should not be 1578 * manipulated by the client while encoding. 1579 * Unless \a file is \c stdout, it will be closed 1580 * when FLAC__stream_encoder_finish() is called. 1581 * Note however that a proper SEEKTABLE cannot be 1582 * created when encoding to \c stdout since it is 1583 * not seekable. 1584 * \param progress_callback See FLAC__StreamEncoderProgressCallback. This 1585 * pointer may be \c NULL if the callback is not 1586 * desired. 1587 * \param client_data This value will be supplied to callbacks in their 1588 * \a client_data argument. 1589 * \assert 1590 * \code encoder != NULL \endcode 1591 * \code file != NULL \endcode 1592 * \retval FLAC__StreamEncoderInitStatus 1593 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful; 1594 * see FLAC__StreamEncoderInitStatus for the meanings of other return values. 1595 */ 1596 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_FILE(FLAC__StreamEncoder *encoder, FILE *file, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data); 1597 1598 /** Initialize the encoder instance to encode Ogg FLAC files. 1599 * 1600 * This flavor of initialization sets up the encoder to encode to a 1601 * plain Ogg FLAC file. For non-stdio streams, you must use 1602 * FLAC__stream_encoder_init_ogg_stream() and provide callbacks for the I/O. 1603 * 1604 * This function should be called after FLAC__stream_encoder_new() and 1605 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process() 1606 * or FLAC__stream_encoder_process_interleaved(). 1607 * initialization succeeded. 1608 * 1609 * \param encoder An uninitialized encoder instance. 1610 * \param file An open file. The file should have been opened 1611 * with mode \c "w+b" and rewound. The file 1612 * becomes owned by the encoder and should not be 1613 * manipulated by the client while encoding. 1614 * Unless \a file is \c stdout, it will be closed 1615 * when FLAC__stream_encoder_finish() is called. 1616 * Note however that a proper SEEKTABLE cannot be 1617 * created when encoding to \c stdout since it is 1618 * not seekable. 1619 * \param progress_callback See FLAC__StreamEncoderProgressCallback. This 1620 * pointer may be \c NULL if the callback is not 1621 * desired. 1622 * \param client_data This value will be supplied to callbacks in their 1623 * \a client_data argument. 1624 * \assert 1625 * \code encoder != NULL \endcode 1626 * \code file != NULL \endcode 1627 * \retval FLAC__StreamEncoderInitStatus 1628 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful; 1629 * see FLAC__StreamEncoderInitStatus for the meanings of other return values. 1630 */ 1631 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_FILE(FLAC__StreamEncoder *encoder, FILE *file, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data); 1632 1633 /** Initialize the encoder instance to encode native FLAC files. 1634 * 1635 * This flavor of initialization sets up the encoder to encode to a plain 1636 * FLAC file. If POSIX fopen() semantics are not sufficient (for example, 1637 * with Unicode filenames on Windows), you must use 1638 * FLAC__stream_encoder_init_FILE(), or FLAC__stream_encoder_init_stream() 1639 * and provide callbacks for the I/O. 1640 * 1641 * This function should be called after FLAC__stream_encoder_new() and 1642 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process() 1643 * or FLAC__stream_encoder_process_interleaved(). 1644 * initialization succeeded. 1645 * 1646 * \param encoder An uninitialized encoder instance. 1647 * \param filename The name of the file to encode to. The file will 1648 * be opened with fopen(). Use \c NULL to encode to 1649 * \c stdout. Note however that a proper SEEKTABLE 1650 * cannot be created when encoding to \c stdout since 1651 * it is not seekable. 1652 * \param progress_callback See FLAC__StreamEncoderProgressCallback. This 1653 * pointer may be \c NULL if the callback is not 1654 * desired. 1655 * \param client_data This value will be supplied to callbacks in their 1656 * \a client_data argument. 1657 * \assert 1658 * \code encoder != NULL \endcode 1659 * \retval FLAC__StreamEncoderInitStatus 1660 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful; 1661 * see FLAC__StreamEncoderInitStatus for the meanings of other return values. 1662 */ 1663 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_file(FLAC__StreamEncoder *encoder, const char *filename, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data); 1664 1665 /** Initialize the encoder instance to encode Ogg FLAC files. 1666 * 1667 * This flavor of initialization sets up the encoder to encode to a plain 1668 * Ogg FLAC file. If POSIX fopen() semantics are not sufficient (for example, 1669 * with Unicode filenames on Windows), you must use 1670 * FLAC__stream_encoder_init_ogg_FILE(), or FLAC__stream_encoder_init_ogg_stream() 1671 * and provide callbacks for the I/O. 1672 * 1673 * This function should be called after FLAC__stream_encoder_new() and 1674 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process() 1675 * or FLAC__stream_encoder_process_interleaved(). 1676 * initialization succeeded. 1677 * 1678 * \param encoder An uninitialized encoder instance. 1679 * \param filename The name of the file to encode to. The file will 1680 * be opened with fopen(). Use \c NULL to encode to 1681 * \c stdout. Note however that a proper SEEKTABLE 1682 * cannot be created when encoding to \c stdout since 1683 * it is not seekable. 1684 * \param progress_callback See FLAC__StreamEncoderProgressCallback. This 1685 * pointer may be \c NULL if the callback is not 1686 * desired. 1687 * \param client_data This value will be supplied to callbacks in their 1688 * \a client_data argument. 1689 * \assert 1690 * \code encoder != NULL \endcode 1691 * \retval FLAC__StreamEncoderInitStatus 1692 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful; 1693 * see FLAC__StreamEncoderInitStatus for the meanings of other return values. 1694 */ 1695 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_file(FLAC__StreamEncoder *encoder, const char *filename, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data); 1696 1697 /** Finish the encoding process. 1698 * Flushes the encoding buffer, releases resources, resets the encoder 1699 * settings to their defaults, and returns the encoder state to 1700 * FLAC__STREAM_ENCODER_UNINITIALIZED. Note that this can generate 1701 * one or more write callbacks before returning, and will generate 1702 * a metadata callback. 1703 * 1704 * Note that in the course of processing the last frame, errors can 1705 * occur, so the caller should be sure to check the return value to 1706 * ensure the file was encoded properly. 1707 * 1708 * In the event of a prematurely-terminated encode, it is not strictly 1709 * necessary to call this immediately before FLAC__stream_encoder_delete() 1710 * but it is good practice to match every FLAC__stream_encoder_init_*() 1711 * with a FLAC__stream_encoder_finish(). 1712 * 1713 * \param encoder An uninitialized encoder instance. 1714 * \assert 1715 * \code encoder != NULL \endcode 1716 * \retval FLAC__bool 1717 * \c false if an error occurred processing the last frame; or if verify 1718 * mode is set (see FLAC__stream_encoder_set_verify()), there was a 1719 * verify mismatch; else \c true. If \c false, caller should check the 1720 * state with FLAC__stream_encoder_get_state() for more information 1721 * about the error. 1722 */ 1723 FLAC_API FLAC__bool FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder); 1724 1725 /** Submit data for encoding. 1726 * This version allows you to supply the input data via an array of 1727 * pointers, each pointer pointing to an array of \a samples samples 1728 * representing one channel. The samples need not be block-aligned, 1729 * but each channel should have the same number of samples. Each sample 1730 * should be a signed integer, right-justified to the resolution set by 1731 * FLAC__stream_encoder_set_bits_per_sample(). For example, if the 1732 * resolution is 16 bits per sample, the samples should all be in the 1733 * range [-32768,32767]. 1734 * 1735 * For applications where channel order is important, channels must 1736 * follow the order as described in the 1737 * <A HREF="../format.html#frame_header">frame header</A>. 1738 * 1739 * \param encoder An initialized encoder instance in the OK state. 1740 * \param buffer An array of pointers to each channel's signal. 1741 * \param samples The number of samples in one channel. 1742 * \assert 1743 * \code encoder != NULL \endcode 1744 * \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode 1745 * \retval FLAC__bool 1746 * \c true if successful, else \c false; in this case, check the 1747 * encoder state with FLAC__stream_encoder_get_state() to see what 1748 * went wrong. 1749 */ 1750 FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples); 1751 1752 /** Submit data for encoding. 1753 * This version allows you to supply the input data where the channels 1754 * are interleaved into a single array (i.e. channel0_sample0, 1755 * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...). 1756 * The samples need not be block-aligned but they must be 1757 * sample-aligned, i.e. the first value should be channel0_sample0 1758 * and the last value channelN_sampleM. Each sample should be a signed 1759 * integer, right-justified to the resolution set by 1760 * FLAC__stream_encoder_set_bits_per_sample(). For example, if the 1761 * resolution is 16 bits per sample, the samples should all be in the 1762 * range [-32768,32767]. 1763 * 1764 * For applications where channel order is important, channels must 1765 * follow the order as described in the 1766 * <A HREF="../format.html#frame_header">frame header</A>. 1767 * 1768 * \param encoder An initialized encoder instance in the OK state. 1769 * \param buffer An array of channel-interleaved data (see above). 1770 * \param samples The number of samples in one channel, the same as for 1771 * FLAC__stream_encoder_process(). For example, if 1772 * encoding two channels, \c 1000 \a samples corresponds 1773 * to a \a buffer of 2000 values. 1774 * \assert 1775 * \code encoder != NULL \endcode 1776 * \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode 1777 * \retval FLAC__bool 1778 * \c true if successful, else \c false; in this case, check the 1779 * encoder state with FLAC__stream_encoder_get_state() to see what 1780 * went wrong. 1781 */ 1782 FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples); 1783 1784 /* \} */ 1785 1786 #ifdef __cplusplus 1787 } 1788 #endif 1789 1790 #endif 1791
