1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002 Josh Coalson
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 #ifndef FLAC__STREAM_ENCODER_H
21 #define FLAC__STREAM_ENCODER_H
24 #include "stream_decoder.h"
31 /** \file include/FLAC/stream_encoder.h
34 * This module contains the functions which implement the stream
37 * See the detailed documentation in the
38 * \link flac_stream_encoder stream encoder \endlink module.
41 /** \defgroup flac_encoder FLAC/ *_encoder.h: encoder interfaces
45 * This module describes the two encoder layers provided by libFLAC.
47 * For encoding FLAC streams, libFLAC provides two layers of access. The
48 * lowest layer is stream-level encoding, and the highest is file-level
49 * encoding. The interfaces are described in the \link flac_stream_encoder
50 * stream encoder \endlink and \link flac_file_encoder file encoder \endlink
51 * modules respectively. Typically you will choose the highest layer that
52 * your output source will support.
54 * The stream encoder relies on callbacks for writing the data and
55 * metadata. The file encoder provides these callbacks internally and you
56 * need only supply the filename.
59 /** \defgroup flac_stream_encoder FLAC/stream_encoder.h: stream encoder interface
60 * \ingroup flac_encoder
63 * This module contains the functions which implement the stream
66 * The basic usage of this encoder is as follows:
67 * - The program creates an instance of an encoder using
68 * FLAC__stream_encoder_new().
69 * - The program overrides the default settings and sets callbacks for
70 * writing and metadata reporting using
71 * FLAC__stream_encoder_set_*() functions.
72 * - The program initializes the instance to validate the settings and
73 * prepare for encoding using FLAC__stream_encoder_init().
74 * - The program calls FLAC__stream_encoder_process() or
75 * FLAC__stream_encoder_process_interleaved() to encode data, which
76 * subsequently calls the callbacks when there is encoder data ready
78 * - The program finishes the encoding with FLAC__stream_encoder_finish(),
79 * which causes the encoder to encode any data still in its input pipe,
80 * call the metadata callback with the final encoding statistics, and
81 * finally reset the encoder to the uninitialized state.
82 * - The instance may be used again or deleted with
83 * FLAC__stream_encoder_delete().
85 * In more detail, the stream encoder functions similarly to the
86 * \link flac_stream_decoder stream decoder \endlink, but has fewer
87 * callbacks and more options. Typically the user will create a new
88 * instance by calling FLAC__stream_encoder_new(), then set the necessary
89 * parameters and callbacks with FLAC__stream_encoder_set_*(), and
90 * initialize it by calling FLAC__stream_encoder_init().
92 * Unlike the decoders, the stream encoder has many options that can
93 * affect the speed and compression ratio. When setting these parameters
94 * you should have some basic knowledge of the format (see the
95 * <A HREF="../documentation.html#format">user-level documentation</A>
96 * or the <A HREF="../format.html">formal description</A>). The
97 * FLAC__stream_encoder_set_*() functions themselves do not validate the
98 * values as many are interdependent. The FLAC__stream_encoder_init()
99 * function will do this, so make sure to pay attention to the state
100 * returned by FLAC__stream_encoder_init() to make sure that it is
101 * FLAC__STREAM_ENCODER_OK. Any parameters that are not set before
102 * FLAC__stream_encoder_init() will take on the defaults from the
105 * The user must provide function pointers for the following callbacks:
107 * - Write callback - This function is called by the encoder anytime there
108 * is raw encoded data to write. It may include metadata mixed with
109 * encoded audio frames and the data is not guaranteed to be aligned on
110 * frame or metadata block boundaries.
111 * - Metadata callback - This function is called once at the end of
112 * encoding with the populated STREAMINFO structure. This is so file
113 * encoders can seek back to the beginning of the file and write the
114 * STREAMINFO block with the correct statistics after encoding (like
115 * minimum/maximum frame size).
117 * The call to FLAC__stream_encoder_init() currently will also immediately
118 * call the write callback several times, once with the \c fLaC signature,
119 * and once for each encoded metadata block.
121 * After initializing the instance, the user may feed audio data to the
122 * encoder in one of two ways:
124 * - Channel separate, through FLAC__stream_encoder_process() - The user
125 * will pass an array of pointers to buffers, one for each channel, to
126 * the encoder, each of the same length. The samples need not be
128 * - Channel interleaved, through
129 * FLAC__stream_encoder_process_interleaved() - The user will pass a single
130 * pointer to data that is channel-interleaved (i.e. channel0_sample0,
131 * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
132 * Again, the samples need not be block-aligned but they must be
133 * sample-aligned, i.e. the first value should be channel0_sample0 and
134 * the last value channelN_sampleM.
136 * When the user is finished encoding data, it calls
137 * FLAC__stream_encoder_finish(), which causes the encoder to encode any
138 * data still in its input pipe, and call the metadata callback with the
139 * final encoding statistics. Then the instance may be deleted with
140 * FLAC__stream_encoder_delete() or initialized again to encode another
143 * For programs that write their own metadata, but that do not know the
144 * actual metadata until after encoding, it is advantageous to instruct
145 * the encoder to write a PADDING block of the correct size, so that
146 * instead of rewriting the whole stream after encoding, the program can
147 * just overwrite the PADDING block. If only the maximum size of the
148 * metadata is known, the program can write a slightly larger padding
149 * block, then split it after encoding.
151 * Make sure you understand how lengths are calculated. All FLAC metadata
152 * blocks have a 4 byte header which contains the type and length. This
153 * length does not include the 4 bytes of the header. See the format page
154 * for the specification of metadata blocks and their lengths.
157 * The "set" functions may only be called when the encoder is in the
158 * state FLAC__STREAM_ENCODER_UNINITIALIZED, i.e. after
159 * FLAC__stream_encoder_new() or FLAC__stream_encoder_finish(), but
160 * before FLAC__stream_encoder_init(). If this is the case they will
161 * return \c true, otherwise \c false.
164 * FLAC__stream_encoder_finish() resets all settings to the constructor
165 * defaults, including the callbacks.
171 /** State values for a FLAC__StreamEncoder
173 * The encoder's state can be obtained by calling FLAC__stream_encoder_get_state().
177 FLAC__STREAM_ENCODER_OK = 0,
178 /**< The encoder is in the normal OK state. */
180 FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR,
181 /**< An error occurred in the underlying verify stream decoder;
182 * check FLAC__stream_encoder_get_verify_decoder_state().
185 FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA,
186 /**< The verify decoder detected a mismatch between the original
187 * audio signal and the decoded audio signal.
190 FLAC__STREAM_ENCODER_INVALID_CALLBACK,
191 /**< The encoder was initialized before setting all the required callbacks. */
193 FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS,
194 /**< The encoder has an invalid setting for number of channels. */
196 FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE,
197 /**< The encoder has an invalid setting for bits-per-sample.
198 * FLAC supports 4-32 bps but the reference encoder currently supports
202 FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE,
203 /**< The encoder has an invalid setting for the input sample rate. */
205 FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE,
206 /**< The encoder has an invalid setting for the block size. */
208 FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION,
209 /**< The encoder has an invalid setting for the precision of the quantized linear predictor coefficients. */
211 FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH,
212 /**< Mid/side coding was specified but the number of channels is not equal to 2. */
214 FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH,
217 FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE,
218 /**< Loose mid/side coding was specified but mid/side coding was not. */
220 FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER,
221 /**< The specified block size is less than the maximum LPC order. */
223 FLAC__STREAM_ENCODER_NOT_STREAMABLE,
224 /**< The encoder is bound to the "streamable subset" but other settings violate it. */
226 FLAC__STREAM_ENCODER_FRAMING_ERROR,
227 /**< An error occurred while writing the stream; usually, the write_callback returned an error. */
229 FLAC__STREAM_ENCODER_INVALID_METADATA,
230 /**< The metadata input to the encoder is invalid, in one of the following ways:
231 * - FLAC__stream_encoder_set_metadata() was called with a null pointer but a block count > 0
232 * - It contains an illegal SEEKTABLE as checked by FLAC__format_seektable_is_legal()
233 * - It contains more than one SEEKTABLE block or more than one VORBIS_COMMENT block
236 FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING,
237 /**< An error occurred while writing the stream; usually, the write_callback returned an error. */
239 FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING,
240 /**< The write_callback returned an error. */
242 FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR,
243 /**< Memory allocation failed. */
245 FLAC__STREAM_ENCODER_ALREADY_INITIALIZED,
246 /**< FLAC__stream_encoder_init() was called when the encoder was
247 * already initialized, usually because
248 * FLAC__stream_encoder_finish() was not called.
251 FLAC__STREAM_ENCODER_UNINITIALIZED
252 /**< The encoder is in the uninitialized state. */
254 } FLAC__StreamEncoderState;
256 /** Maps a FLAC__StreamEncoderState to a C string.
258 * Using a FLAC__StreamEncoderState as the index to this array
259 * will give the string equivalent. The contents should not be modified.
261 extern const char * const FLAC__StreamEncoderStateString[];
263 /** Return values for the FLAC__StreamEncoder write callback.
267 FLAC__STREAM_ENCODER_WRITE_STATUS_OK = 0,
268 /**< The write was OK and encoding can continue. */
270 FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR
271 /**< An unrecoverable error occurred. The encoder will return from the process call. */
273 } FLAC__StreamEncoderWriteStatus;
275 /** Maps a FLAC__StreamEncoderWriteStatus to a C string.
277 * Using a FLAC__StreamEncoderWriteStatus as the index to this array
278 * will give the string equivalent. The contents should not be modified.
280 extern const char * const FLAC__StreamEncoderWriteStatusString[];
283 /***********************************************************************
285 * class FLAC__StreamEncoder
287 ***********************************************************************/
289 struct FLAC__StreamEncoderProtected;
290 struct FLAC__StreamEncoderPrivate;
291 /** The opaque structure definition for the stream encoder type.
292 * See the \link flac_stream_encoder stream encoder module \endlink
293 * for a detailed description.
296 struct FLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
297 struct FLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
298 } FLAC__StreamEncoder;
300 /** Signature for the write callback.
301 * See FLAC__stream_encoder_set_write_callback() for more info.
303 * \param encoder The encoder instance calling the callback.
304 * \param buffer An array of encoded data of length \a bytes.
305 * \param bytes The byte length of \a buffer.
306 * \param samples The number of samples encoded by \a buffer.
307 * \c 0 has a special meaning; see
308 * FLAC__stream_encoder_set_write_callback().
309 * \param current_frame The number of the current frame being encoded.
310 * \param client_data The callee's client data set through
311 * FLAC__stream_encoder_set_client_data().
312 * \retval FLAC__StreamDecoderWriteStatus
313 * The callee's return status.
315 typedef FLAC__StreamEncoderWriteStatus (*FLAC__StreamEncoderWriteCallback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
317 /** Signature for the metadata callback.
318 * See FLAC__stream_encoder_set_metadata_callback() for more info.
320 * \param encoder The encoder instance calling the callback.
321 * \param metadata The final populated STREAMINFO block.
322 * \param client_data The callee's client data set through
323 * FLAC__stream_encoder_set_client_data().
325 typedef void (*FLAC__StreamEncoderMetadataCallback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data);
328 /***********************************************************************
330 * Class constructor/destructor
332 ***********************************************************************/
334 /** Create a new stream encoder instance. The instance is created with
335 * default settings; see the individual FLAC__stream_encoder_set_*()
336 * functions for each setting's default.
338 * \retval FLAC__StreamEncoder*
339 * \c NULL if there was an error allocating memory, else the new instance.
341 FLAC__StreamEncoder *FLAC__stream_encoder_new();
343 /** Free an encoder instance. Deletes the object pointed to by \a encoder.
345 * \param encoder A pointer to an existing encoder.
347 * \code encoder != NULL \endcode
349 void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder);
351 /***********************************************************************
353 * Public class method prototypes
355 ***********************************************************************/
357 /** Set the "verify" flag. If \c true, the encoder will verify it's own
358 * encoded output by feeding it through an internal decoder and comparing
359 * the original signal against the decoded signal. If a mismatch occurs,
360 * the process call will return \c false. Note that this will slow the
361 * encoding process by the extra time required for decoding and comparison.
364 * \param encoder An encoder instance to set.
365 * \param value Flag value (see above).
367 * \code encoder != NULL \endcode
369 * \c false if the encoder is already initialized, else \c true.
371 FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value);
373 /** Set the "streamable subset" flag. If \c true, the encoder will comply
374 * with the subset (see the format specification) and will check the
375 * settings during FLAC__stream_encoder_init() to see if all settings
376 * comply. If \c false, the settings may take advantage of the full
377 * range that the format allows.
379 * Make sure you know what it entails before setting this to \c false.
382 * \param encoder An encoder instance to set.
383 * \param value Flag value (see above).
385 * \code encoder != NULL \endcode
387 * \c false if the encoder is already initialized, else \c true.
389 FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value);
391 /** Set to \c true to enable mid-side encoding on stereo input. The
392 * number of channels must be 2. Set to \c false to use only
393 * independent channel coding.
396 * \param encoder An encoder instance to set.
397 * \param value Flag value (see above).
399 * \code encoder != NULL \endcode
401 * \c false if the encoder is already initialized, else \c true.
403 FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
405 /** Set to \c true to enable adaptive switching between mid-side and
406 * left-right encoding on stereo input. The number of channels must
407 * be 2. Set to \c false to use exhaustive searching. In either
408 * case, the mid/side stereo setting must be \c true.
411 * \param encoder An encoder instance to set.
412 * \param value Flag value (see above).
414 * \code encoder != NULL \endcode
416 * \c false if the encoder is already initialized, else \c true.
418 FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
420 /** Set the number of channels to be encoded.
423 * \param encoder An encoder instance to set.
424 * \param value See above.
426 * \code encoder != NULL \endcode
428 * \c false if the encoder is already initialized, else \c true.
430 FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value);
432 /** Set the sample resolution of the input to be encoded.
435 * Do not feed the encoder data that is wider than the value you
436 * set here or you will generate an invalid stream.
439 * \param encoder An encoder instance to set.
440 * \param value See above.
442 * \code encoder != NULL \endcode
444 * \c false if the encoder is already initialized, else \c true.
446 FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value);
448 /** Set the sample rate (in Hz) of the input to be encoded.
451 * \param encoder An encoder instance to set.
452 * \param value See above.
454 * \code encoder != NULL \endcode
456 * \c false if the encoder is already initialized, else \c true.
458 FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value);
460 /** Set the blocksize to use while encoding.
463 * \param encoder An encoder instance to set.
464 * \param value See above.
466 * \code encoder != NULL \endcode
468 * \c false if the encoder is already initialized, else \c true.
470 FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value);
472 /** Set the maximum LPC order, or \c 0 to use only the fixed predictors.
475 * \param encoder An encoder instance to set.
476 * \param value See above.
478 * \code encoder != NULL \endcode
480 * \c false if the encoder is already initialized, else \c true.
482 FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value);
484 /** Set the precision, in bits, of the quantized linear predictor
485 * coefficients, or \c 0 to let the encoder select it based on the
489 * In the current implementation, qlp_coeff_precision + bits_per_sample must
493 * \param encoder An encoder instance to set.
494 * \param value See above.
496 * \code encoder != NULL \endcode
498 * \c false if the encoder is already initialized, else \c true.
500 FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value);
502 /** Set to \c false to use only the specified quantized linear predictor
503 * coefficient precision, or \c true to search neighboring precision
504 * values and use the best one.
507 * \param encoder An encoder instance to set.
508 * \param value See above.
510 * \code encoder != NULL \endcode
512 * \c false if the encoder is already initialized, else \c true.
514 FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
516 /** Deprecated. Setting this value has no effect.
519 * \param encoder An encoder instance to set.
520 * \param value See above.
522 * \code encoder != NULL \endcode
524 * \c false if the encoder is already initialized, else \c true.
526 FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value);
528 /** Set to \c false to let the encoder estimate the best model order
529 * based on the residual signal energy, or \c true to force the
530 * encoder to evaluate all order models and select the best.
533 * \param encoder An encoder instance to set.
534 * \param value See above.
536 * \code encoder != NULL \endcode
538 * \c false if the encoder is already initialized, else \c true.
540 FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
542 /** Set the minimum partition order to search when coding the residual.
543 * This is used in tandem with
544 * FLAC__stream_encoder_set_max_residual_partition_order().
546 * The partition order determines the context size in the residual.
547 * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
549 * Set both min and max values to \c 0 to force a single context,
550 * whose Rice parameter is based on the residual signal variance.
551 * Otherwise, set a min and max order, and the encoder will search
552 * all orders, using the mean of each context for its Rice parameter,
556 * \param encoder An encoder instance to set.
557 * \param value See above.
559 * \code encoder != NULL \endcode
561 * \c false if the encoder is already initialized, else \c true.
563 FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
565 /** Set the minimum partition order to search when coding the residual.
566 * This is used in tandem with
567 * FLAC__stream_encoder_set_min_residual_partition_order().
569 * The partition order determines the context size in the residual.
570 * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
572 * Set both min and max values to \c 0 to force a single context,
573 * whose Rice parameter is based on the residual signal variance.
574 * Otherwise, set a min and max order, and the encoder will search
575 * all orders, using the mean of each context for its Rice parameter,
579 * \param encoder An encoder instance to set.
580 * \param value See above.
582 * \code encoder != NULL \endcode
584 * \c false if the encoder is already initialized, else \c true.
586 FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
588 /** Deprecated. Setting this value has no effect.
591 * \param encoder An encoder instance to set.
592 * \param value See above.
594 * \code encoder != NULL \endcode
596 * \c false if the encoder is already initialized, else \c true.
598 FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value);
600 /** Set an estimate of the total samples that will be encoded.
601 * This is merely an estimate and may be set to \c 0 if unknown.
602 * This value will be written to the STREAMINFO block before encoding,
603 * and can remove the need for the caller to rewrite the value later
604 * if the value is known before encoding.
607 * \param encoder An encoder instance to set.
608 * \param value See above.
610 * \code encoder != NULL \endcode
612 * \c false if the encoder is already initialized, else \c true.
614 FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value);
616 /** Set the metadata blocks to be emitted to the stream before encoding.
617 * A value of \c NULL, \c 0 implies no metadata; otherwise, supply an
618 * array of pointers to metadata blocks. The array is non-const since
619 * the encoder may need to change the \a is_last flag inside them.
620 * Otherwise, the encoder will not modify or free the blocks. It is up
621 * to the caller to free the metadata blocks after encoding.
624 * The encoder stores only the \a metadata pointer; the passed-in array
625 * must survive at least until after FLAC__stream_encoder_init() returns.
626 * Do not modify the array or free the blocks until then.
629 * The STREAMINFO block is always written and no STREAMINFO block may
630 * occur in the supplied array.
633 * A VORBIS_COMMENT block may be supplied. The vendor string in it
634 * will be ignored. libFLAC will use it's own vendor string. libFLAC
635 * will not modify the passed-in VORBIS_COMMENT's vendor string, it
636 * will simply write it's own into the stream. If no VORBIS_COMMENT
637 * block is present in the \a metadata array, libFLAC will write an
638 * empty one, containing only the vendor string.
640 * \default \c NULL, 0
641 * \param encoder An encoder instance to set.
642 * \param metadata See above.
643 * \param num_blocks See above.
645 * \code encoder != NULL \endcode
647 * \c false if the encoder is already initialized, else \c true.
649 FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks);
651 /** Set the write callback.
652 * The supplied function will be called by the encoder anytime there is raw
653 * encoded data ready to write. It may include metadata mixed with encoded
654 * audio frames and the data is not guaranteed to be aligned on frame or
655 * metadata block boundaries.
657 * The only duty of the callback is to write out the \a bytes worth of data
658 * in \a buffer to the current position in the output stream. The arguments
659 * \a samples and \a current_frame are purely informational. If \a samples
660 * is greater than \c 0, then \a current_frame will hold the current frame
661 * number that is being written; otherwise, the write callback is being called
665 * The callback is mandatory and must be set before initialization.
668 * \param encoder An encoder instance to set.
669 * \param value See above.
671 * \code encoder != NULL \endcode
672 * \code value != NULL \endcode
674 * \c false if the encoder is already initialized, else \c true.
676 FLAC__bool FLAC__stream_encoder_set_write_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteCallback value);
678 /** Set the metadata callback.
679 * The supplied function will be called once at the end of encoding with
680 * the populated STREAMINFO structure. This is so file encoders can seek
681 * back to the beginning of the file and write the STREAMINFO block with
682 * the correct statistics after encoding (like minimum/maximum frame size
683 * and total samples).
686 * The callback is mandatory and must be set before initialization.
689 * \param encoder An encoder instance to set.
690 * \param value See above.
692 * \code encoder != NULL \endcode
693 * \code value != NULL \endcode
695 * \c false if the encoder is already initialized, else \c true.
697 FLAC__bool FLAC__stream_encoder_set_metadata_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderMetadataCallback value);
699 /** Set the client data to be passed back to callbacks.
700 * This value will be supplied to callbacks in their \a client_data
704 * \param encoder An encoder instance to set.
705 * \param value See above.
707 * \code encoder != NULL \endcode
709 * \c false if the encoder is already initialized, else \c true.
711 FLAC__bool FLAC__stream_encoder_set_client_data(FLAC__StreamEncoder *encoder, void *value);
713 /** Get the current encoder state.
715 * \param encoder An encoder instance to query.
717 * \code encoder != NULL \endcode
718 * \retval FLAC__StreamEncoderState
719 * The current encoder state.
721 FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder);
723 /** Get the state of the verify stream decoder.
724 * Useful when the stream encoder state is
725 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR.
727 * \param encoder An encoder instance to query.
729 * \code encoder != NULL \endcode
730 * \retval FLAC__StreamDecoderState
731 * The verify stream decoder state.
733 FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder);
735 /** Get relevant values about the nature of a verify decoder error.
736 * Useful when the stream encoder state is
737 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR. The arguments should
738 * be addresses in which the stats will be returned, or NULL if value
741 * \param encoder An encoder instance to query.
742 * \param absolute_sample The absolute sample number of the mismatch.
743 * \param frame_number The number of the frame in which the mismatch occurred.
744 * \param channel The channel in which the mismatch occurred.
745 * \param sample The number of the sample (relative to the frame) in
746 * which the mismatch occurred.
747 * \param expected The expected value for the sample in question.
748 * \param got The actual value returned by the decoder.
750 * \code encoder != NULL \endcode
752 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);
754 /** Get the "verify" flag.
756 * \param encoder An encoder instance to query.
758 * \code encoder != NULL \endcode
760 * See FLAC__stream_encoder_set_verify().
762 FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder);
764 /** Get the "streamable subset" flag.
766 * \param encoder An encoder instance to query.
768 * \code encoder != NULL \endcode
770 * See FLAC__stream_encoder_set_streamable_subset().
772 FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder);
774 /** Get the "mid/side stereo coding" flag.
776 * \param encoder An encoder instance to query.
778 * \code encoder != NULL \endcode
780 * See FLAC__stream_encoder_get_do_mid_side_stereo().
782 FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder);
784 /** Get the "adaptive mid/side switching" flag.
786 * \param encoder An encoder instance to query.
788 * \code encoder != NULL \endcode
790 * See FLAC__stream_encoder_set_loose_mid_side_stereo().
792 FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder);
794 /** Get the number of input channels being processed.
796 * \param encoder An encoder instance to query.
798 * \code encoder != NULL \endcode
800 * See FLAC__stream_encoder_set_channels().
802 unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder);
804 /** Get the input sample resolution setting.
806 * \param encoder An encoder instance to query.
808 * \code encoder != NULL \endcode
810 * See FLAC__stream_encoder_set_bits_per_sample().
812 unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder);
814 /** Get the input sample rate setting.
816 * \param encoder An encoder instance to query.
818 * \code encoder != NULL \endcode
820 * See FLAC__stream_encoder_set_sample_rate().
822 unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder);
824 /** Get the blocksize setting.
826 * \param encoder An encoder instance to query.
828 * \code encoder != NULL \endcode
830 * See FLAC__stream_encoder_set_blocksize().
832 unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder);
834 /** Get the maximum LPC order setting.
836 * \param encoder An encoder instance to query.
838 * \code encoder != NULL \endcode
840 * See FLAC__stream_encoder_set_max_lpc_order().
842 unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder);
844 /** Get the quantized linear predictor coefficient precision setting.
846 * \param encoder An encoder instance to query.
848 * \code encoder != NULL \endcode
850 * See FLAC__stream_encoder_set_qlp_coeff_precision().
852 unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder);
854 /** Get the qlp coefficient precision search flag.
856 * \param encoder An encoder instance to query.
858 * \code encoder != NULL \endcode
860 * See FLAC__stream_encoder_set_do_qlp_coeff_prec_search().
862 FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder);
864 /** Get the "escape coding" flag.
866 * \param encoder An encoder instance to query.
868 * \code encoder != NULL \endcode
870 * See FLAC__stream_encoder_set_do_escape_coding().
872 FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder);
874 /** Get the exhaustive model search flag.
876 * \param encoder An encoder instance to query.
878 * \code encoder != NULL \endcode
880 * See FLAC__stream_encoder_set_do_exhaustive_model_search().
882 FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder);
884 /** Get the minimum residual partition order setting.
886 * \param encoder An encoder instance to query.
888 * \code encoder != NULL \endcode
890 * See FLAC__stream_encoder_set_min_residual_partition_order().
892 unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder);
894 /** Get maximum residual partition order setting.
896 * \param encoder An encoder instance to query.
898 * \code encoder != NULL \endcode
900 * See FLAC__stream_encoder_set_max_residual_partition_order().
902 unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder);
904 /** Get the Rice parameter search distance setting.
906 * \param encoder An encoder instance to query.
908 * \code encoder != NULL \endcode
910 * See FLAC__stream_encoder_set_rice_parameter_search_dist().
912 unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder);
914 /** Get the previously set estimate of the total samples to be encoded.
915 * The encoder merely mimics back the value given to
916 * FLAC__stream_encoder_set_total_samples_estimate() since it has no
917 * other way of knowing how many samples the user will encode.
919 * \param encoder An encoder instance to set.
921 * \code encoder != NULL \endcode
922 * \retval FLAC__uint64
923 * See FLAC__stream_encoder_get_total_samples_estimate().
925 FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder);
927 /** Initialize the encoder instance.
928 * Should be called after FLAC__stream_encoder_new() and
929 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
930 * or FLAC__stream_encoder_process_interleaved(). Will set and return
931 * the encoder state, which will be FLAC__STREAM_ENCODER_OK if
932 * initialization succeeded.
934 * The call to FLAC__stream_encoder_init() currently will also immediately
935 * call the write callback several times, once with the \c fLaC signature,
936 * and once for each encoded metadata block.
938 * \param encoder An uninitialized encoder instance.
940 * \code encoder != NULL \endcode
941 * \retval FLAC__StreamEncoderState
942 * \c FLAC__STREAM_ENCODER_OK if initialization was successful; see
943 * FLAC__StreamEncoderState for the meanings of other return values.
945 FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder);
947 /** Finish the encoding process.
948 * Flushes the encoding buffer, releases resources, resets the encoder
949 * settings to their defaults, and returns the encoder state to
950 * FLAC__STREAM_ENCODER_UNINITIALIZED. Note that this can generate
951 * one or more write callbacks before returning, and will generate
952 * a metadata callback.
954 * In the event of a prematurely-terminated encode, it is not strictly
955 * necessary to call this immediately before FLAC__stream_encoder_delete()
956 * but it is good practice to match every FLAC__stream_encoder_init()
957 * with a FLAC__stream_encoder_finish().
959 * \param encoder An uninitialized encoder instance.
961 * \code encoder != NULL \endcode
963 void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder);
965 /** Submit data for encoding.
966 * This version allows you to supply the input data via an array of
967 * pointers, each pointer pointing to an array of \a samples samples
968 * representing one channel. The samples need not be block-aligned,
969 * but each channel should have the same number of samples.
971 * \param encoder An initialized encoder instance in the OK state.
972 * \param buffer An array of pointers to each channel's signal.
973 * \param samples The number of samples in one channel.
975 * \code encoder != NULL \endcode
976 * \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
978 * \c true if successful, else \c false; in this case, check the
979 * encoder state with FLAC__stream_encoder_get_state() to see what
982 FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples);
984 /** Submit data for encoding.
985 * This version allows you to supply the input data where the channels
986 * are interleaved into a single array (i.e. channel0_sample0,
987 * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
988 * The samples need not be block-aligned but they must be
989 * sample-aligned, i.e. the first value should be channel0_sample0
990 * and the last value channelN_sampleM.
992 * \param encoder An initialized encoder instance in the OK state.
993 * \param buffer An array of channel-interleaved data (see above).
994 * \param samples The number of samples in one channel, the same as for
995 * FLAC__stream_encoder_process(). For example, if
996 * encoding two channels, \c 1000 \a samples corresponds
997 * to a \a buffer of 2000 values.
999 * \code encoder != NULL \endcode
1000 * \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
1001 * \retval FLAC__bool
1002 * \c true if successful, else \c false; in this case, check the
1003 * encoder state with FLAC__stream_encoder_get_state() to see what
1006 FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples);