1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003,2004,2005,2006 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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13 * documentation and/or other materials provided with the distribution.
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16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
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20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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32 #ifndef FLAC__STREAM_ENCODER_H
33 #define FLAC__STREAM_ENCODER_H
35 #include <stdio.h> /* for FILE */
38 #include "stream_decoder.h"
45 /** \file include/FLAC/stream_encoder.h
48 * This module contains the functions which implement the stream
51 * See the detailed documentation in the
52 * \link flac_stream_encoder stream encoder \endlink module.
55 /** \defgroup flac_encoder FLAC/ *_encoder.h: encoder interfaces
59 * This module describes the two encoder layers provided by libFLAC.
61 * libFLAC provides two ways of encoding FLAC streams. There is a @@@@@@frame encoder which encodes single frames at a time, and a stream encoder which encodes whole streams.
63 * @@@@@@TODO frame encoder
65 * The stream encoder can be used encode complete streams either to the
66 * client via callbacks, or directly to a file, depending on how it is
67 * initialized. When encoding via callbacks, the client provides a write
68 * callback which will be called whenever FLAC data is ready to be written.
69 * If the client also supplies a seek callback, the encoder will also
70 * automatically handle the writing back of metadata discovered while
71 * encoding, like stream info, seek points offsets, etc. When encoding to
72 * a file, the client needs only supply a filename or open \c FILE* and an
73 * optional progress callback for periodic notification of progress; the
74 * write and seek callbacks are supplied internally. For more info see the
75 * \link flac_stream_encoder stream encoder \endlink module.
78 /** \defgroup flac_stream_encoder FLAC/stream_encoder.h: stream encoder interface
79 * \ingroup flac_encoder
82 * This module contains the functions which implement the stream
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.
90 * - The program initializes the instance to validate the settings and
91 * prepare for encoding using FLAC__stream_encoder_init_stream() or
92 * FLAC__stream_encoder_init_FILE() or FLAC__stream_encoder_init_file(),
93 * depending on the nature of the output.
94 * - The program calls FLAC__stream_encoder_process() or
95 * FLAC__stream_encoder_process_interleaved() to encode data, which
96 * subsequently calls the callbacks when there is encoder data ready
98 * - The program finishes the encoding with FLAC__stream_encoder_finish(),
99 * which causes the encoder to encode any data still in its input pipe,
100 * update the metadata with the final encoding statistics if output
101 * seeking is possible, and finally reset the encoder to the
102 * uninitialized state.
103 * - The instance may be used again or deleted with
104 * FLAC__stream_encoder_delete().
106 * In more detail, the stream encoder functions similarly to the
107 * \link flac_stream_decoder stream decoder \endlink, but has fewer
108 * callbacks and more options. Typically the user will create a new
109 * instance by calling FLAC__stream_encoder_new(), then set the necessary
110 * parameters with FLAC__stream_encoder_set_*(), and initialize it by
111 * calling FLAC__stream_encoder_init_stream() or
112 * FLAC__stream_encoder_init_file() or FLAC__stream_encoder_init_FILE().
114 * Unlike the decoders, the stream encoder has many options that can
115 * affect the speed and compression ratio. When setting these parameters
116 * you should have some basic knowledge of the format (see the
117 * <A HREF="../documentation.html#format">user-level documentation</A>
118 * or the <A HREF="../format.html">formal description</A>). The
119 * FLAC__stream_encoder_set_*() functions themselves do not validate the
120 * values as many are interdependent. The FLAC__stream_encoder_init_*()
121 * functions will do this, so make sure to pay attention to the state
122 * returned by FLAC__stream_encoder_init_*() to make sure that it is
123 * FLAC__STREAM_ENCODER_INIT_STATUS_OK. Any parameters that are not set
124 * before FLAC__stream_encoder_init_*() will take on the defaults from
127 * There are three initialization functions, one for setting up the encoder
128 * to encode FLAC data to the client via callbacks, and two for encoding
129 * directly to a file.
131 * For encoding via callbacks, use FLAC__stream_encoder_init_stream().
132 * You must also supply a write callback which will be called anytime
133 * there is raw encoded data to write. If the client can seek the output
134 * it is best to also supply seek and tell callbacks, as this allows the
135 * encoder to go back after encoding is finished to write back
136 * information that was collected while encoding, like seek point offsets,
139 * For encoding directly to a file, use FLAC__stream_encoder_init_FILE()
140 * or FLAC__stream_encoder_init_file(). Then you must only supply a
141 * filename or open \c FILE*; the encoder will handle all the callbacks
142 * internally. You may also supply a progress callback for periodic
143 * notification of the encoding progress.
145 * The call to FLAC__stream_encoder_init_*() currently will also immediately
146 * call the write callback several times, once with the \c fLaC signature,
147 * and once for each encoded metadata block.
149 * After initializing the instance, the user may feed audio data to the
150 * encoder in one of two ways:
152 * - Channel separate, through FLAC__stream_encoder_process() - The user
153 * will pass an array of pointers to buffers, one for each channel, to
154 * the encoder, each of the same length. The samples need not be
156 * - Channel interleaved, through
157 * FLAC__stream_encoder_process_interleaved() - The user will pass a single
158 * pointer to data that is channel-interleaved (i.e. channel0_sample0,
159 * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
160 * Again, the samples need not be block-aligned but they must be
161 * sample-aligned, i.e. the first value should be channel0_sample0 and
162 * the last value channelN_sampleM.
164 * When the user is finished encoding data, it calls
165 * FLAC__stream_encoder_finish(), which causes the encoder to encode any
166 * data still in its input pipe, and call the metadata callback with the
167 * final encoding statistics. Then the instance may be deleted with
168 * FLAC__stream_encoder_delete() or initialized again to encode another
171 * For programs that write their own metadata, but that do not know the
172 * actual metadata until after encoding, it is advantageous to instruct
173 * the encoder to write a PADDING block of the correct size, so that
174 * instead of rewriting the whole stream after encoding, the program can
175 * just overwrite the PADDING block. If only the maximum size of the
176 * metadata is known, the program can write a slightly larger padding
177 * block, then split it after encoding.
179 * Make sure you understand how lengths are calculated. All FLAC metadata
180 * blocks have a 4 byte header which contains the type and length. This
181 * length does not include the 4 bytes of the header. See the format page
182 * for the specification of metadata blocks and their lengths.
185 * If you are writing the FLAC data to a file via callbacks, make sure it
186 * is open for update (e.g. mode "w+" for stdio streams). This is because
187 * after the first encoding pass, the encoder will try to seek back to the
188 * beginning of the stream, to the STREAMINFO block, to write some data
189 * there. (If using FLAC__stream_encoder_init_file() or
190 * FLAC__stream_encoder_init_FILE(), the file is managed internally.)
193 * The "set" functions may only be called when the encoder is in the
194 * state FLAC__STREAM_ENCODER_UNINITIALIZED, i.e. after
195 * FLAC__stream_encoder_new() or FLAC__stream_encoder_finish(), but
196 * before FLAC__stream_encoder_init(). If this is the case they will
197 * return \c true, otherwise \c false.
200 * FLAC__stream_encoder_finish() resets all settings to the constructor
207 /** State values for a FLAC__StreamEncoder.
209 * The encoder's state can be obtained by calling FLAC__stream_encoder_get_state().
211 * If the encoder gets into any other state besides \c FLAC__STREAM_ENCODER_OK
212 * or \c FLAC__STREAM_ENCODER_UNINITIALIZED, it becomes invalid for encoding and
213 * must be deleted with FLAC__stream_encoder_delete().
217 FLAC__STREAM_ENCODER_OK = 0,
218 /**< The encoder is in the normal OK state and samples can be processed. */
220 FLAC__STREAM_ENCODER_UNINITIALIZED,
221 /**< The encoder is in the uninitialized state; one of the
222 * FLAC__stream_encoder_init_*() functions must be called before samples
226 FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR,
227 /**< An error occurred in the underlying verify stream decoder;
228 * check FLAC__stream_encoder_get_verify_decoder_state().
231 FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA,
232 /**< The verify decoder detected a mismatch between the original
233 * audio signal and the decoded audio signal.
236 FLAC__STREAM_ENCODER_CLIENT_ERROR,
237 /**< One of the callbacks returned a fatal error. */
239 FLAC__STREAM_ENCODER_IO_ERROR,
240 /**< An I/O error occurred while opening/reading/writing a file.
244 FLAC__STREAM_ENCODER_FRAMING_ERROR,
245 /**< An error occurred while writing the stream; usually, the
246 * write_callback returned an error.
249 FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR
250 /**< Memory allocation failed. */
252 } FLAC__StreamEncoderState;
254 /** Maps a FLAC__StreamEncoderState to a C string.
256 * Using a FLAC__StreamEncoderState as the index to this array
257 * will give the string equivalent. The contents should not be modified.
259 extern FLAC_API const char * const FLAC__StreamEncoderStateString[];
261 /** Possible return values for the FLAC__stream_encoder_init_*() functions.
265 FLAC__STREAM_ENCODER_INIT_STATUS_OK = 0,
266 /**< Initialization was successful. */
268 FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR,
269 /**< General failure to set up encoder; call FLAC__stream_encoder_get_state() for cause. */
271 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS,
272 /**< A required callback was not supplied. */
274 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS,
275 /**< The encoder has an invalid setting for number of channels. */
277 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BITS_PER_SAMPLE,
278 /**< The encoder has an invalid setting for bits-per-sample.
279 * FLAC supports 4-32 bps but the reference encoder currently supports
283 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_SAMPLE_RATE,
284 /**< The encoder has an invalid setting for the input sample rate. */
286 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE,
287 /**< The encoder has an invalid setting for the block size. */
289 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER,
290 /**< The encoder has an invalid setting for the maximum LPC order. */
292 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION,
293 /**< The encoder has an invalid setting for the precision of the quantized linear predictor coefficients. */
295 FLAC__STREAM_ENCODER_INIT_STATUS_MID_SIDE_CHANNELS_MISMATCH,
296 /**< Mid/side coding was specified but the number of channels is not equal to 2. */
298 FLAC__STREAM_ENCODER_INIT_STATUS_MID_SIDE_SAMPLE_SIZE_MISMATCH,
301 FLAC__STREAM_ENCODER_INIT_STATUS_ILLEGAL_MID_SIDE_FORCE,
302 /**< Loose mid/side coding was specified but mid/side coding was not. */
304 FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER,
305 /**< The specified block size is less than the maximum LPC order. */
307 FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE,
308 /**< The encoder is bound to the "streamable subset" but other settings violate it. */
310 FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA,
311 /**< The metadata input to the encoder is invalid, in one of the following ways:
312 * - FLAC__stream_encoder_set_metadata() was called with a null pointer but a block count > 0
313 * - One of the metadata blocks contains an undefined type
314 * - It contains an illegal CUESHEET as checked by FLAC__format_cuesheet_is_legal()
315 * - It contains an illegal SEEKTABLE as checked by FLAC__format_seektable_is_legal()
316 * - It contains more than one SEEKTABLE block or more than one VORBIS_COMMENT block
319 FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED
320 /**< FLAC__stream_encoder_init_*() was called when the encoder was
321 * already initialized, usually because
322 * FLAC__stream_encoder_finish() was not called.
325 } FLAC__StreamEncoderInitStatus;
327 /** Maps a FLAC__StreamEncoderInitStatus to a C string.
329 * Using a FLAC__StreamEncoderInitStatus as the index to this array
330 * will give the string equivalent. The contents should not be modified.
332 extern FLAC_API const char * const FLAC__StreamEncoderInitStatusString[];
334 /** Return values for the FLAC__StreamEncoder write callback.
338 FLAC__STREAM_ENCODER_WRITE_STATUS_OK = 0,
339 /**< The write was OK and encoding can continue. */
341 FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR
342 /**< An unrecoverable error occurred. The encoder will return from the process call. */
344 } FLAC__StreamEncoderWriteStatus;
346 /** Maps a FLAC__StreamEncoderWriteStatus to a C string.
348 * Using a FLAC__StreamEncoderWriteStatus as the index to this array
349 * will give the string equivalent. The contents should not be modified.
351 extern FLAC_API const char * const FLAC__StreamEncoderWriteStatusString[];
353 /** Return values for the FLAC__StreamEncoder seek callback.
357 FLAC__STREAM_ENCODER_SEEK_STATUS_OK,
358 /**< The seek was OK and encoding can continue. */
360 FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR,
361 /**< An unrecoverable error occurred. */
363 FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED
364 /**< Client does not support seeking. */
366 } FLAC__StreamEncoderSeekStatus;
368 /** Maps a FLAC__StreamEncoderSeekStatus to a C string.
370 * Using a FLAC__StreamEncoderSeekStatus as the index to this array
371 * will give the string equivalent. The contents should not be modified.
373 extern FLAC_API const char * const FLAC__StreamEncoderSeekStatusString[];
376 /** Return values for the FLAC__StreamEncoder tell callback.
380 FLAC__STREAM_ENCODER_TELL_STATUS_OK,
381 /**< The tell was OK and encoding can continue. */
383 FLAC__STREAM_ENCODER_TELL_STATUS_ERROR,
384 /**< An unrecoverable error occurred. */
386 FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED
387 /**< Client does not support seeking. */
389 } FLAC__StreamEncoderTellStatus;
391 /** Maps a FLAC__StreamEncoderTellStatus to a C string.
393 * Using a FLAC__StreamEncoderTellStatus as the index to this array
394 * will give the string equivalent. The contents should not be modified.
396 extern FLAC_API const char * const FLAC__StreamEncoderTellStatusString[];
399 /***********************************************************************
401 * class FLAC__StreamEncoder
403 ***********************************************************************/
405 struct FLAC__StreamEncoderProtected;
406 struct FLAC__StreamEncoderPrivate;
407 /** The opaque structure definition for the stream encoder type.
408 * See the \link flac_stream_encoder stream encoder module \endlink
409 * for a detailed description.
412 struct FLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
413 struct FLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
414 } FLAC__StreamEncoder;
416 /** Signature for the write callback.
418 * A function pointer matching this signature must be passed to
419 * FLAC__stream_encoder_init_stream(). The supplied function will be called
420 * by the encoder anytime there is raw encoded data ready to write. It may
421 * include metadata mixed with encoded audio frames and the data is not
422 * guaranteed to be aligned on frame or metadata block boundaries.
424 * The only duty of the callback is to write out the \a bytes worth of data
425 * in \a buffer to the current position in the output stream. The arguments
426 * \a samples and \a current_frame are purely informational. If \a samples
427 * is greater than \c 0, then \a current_frame will hold the current frame
428 * number that is being written; otherwise it indicates that the write
429 * callback is being called to write metadata.
431 * \note In general, FLAC__StreamEncoder functions which change the
432 * state should not be called on the \a encoder while in the callback.
434 * \param encoder The encoder instance calling the callback.
435 * \param buffer An array of encoded data of length \a bytes.
436 * \param bytes The byte length of \a buffer.
437 * \param samples The number of samples encoded by \a buffer.
438 * \c 0 has a special meaning; see above.
439 * \param current_frame The number of the current frame being encoded.
440 * \param client_data The callee's client data set through
441 * FLAC__stream_encoder_init_*().
442 * \retval FLAC__StreamEncoderWriteStatus
443 * The callee's return status.
445 typedef FLAC__StreamEncoderWriteStatus (*FLAC__StreamEncoderWriteCallback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
447 /** Signature for the seek callback.
449 * A function pointer matching this signature may be passed to
450 * FLAC__stream_encoder_init_stream(). The supplied function will be called
451 * when the encoder needs to seek the output stream. The encoder will pass
452 * the absolute byte offset to seek to, 0 meaning the beginning of the stream.
454 * \note In general, FLAC__StreamEncoder functions which change the
455 * state should not be called on the \a encoder while in the callback.
457 * \param encoder The encoder instance calling the callback.
458 * \param absolute_byte_offset The offset from the beginning of the stream
460 * \param client_data The callee's client data set through
461 * FLAC__stream_encoder_init_*().
462 * \retval FLAC__StreamEncoderSeekStatus
463 * The callee's return status.
465 typedef FLAC__StreamEncoderSeekStatus (*FLAC__StreamEncoderSeekCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data);
467 /** Signature for the tell callback.
469 * A function pointer matching this signature may be passed to
470 * FLAC__stream_encoder_init_stream(). The supplied function will be called
471 * when the encoder needs to know the current position of the output stream.
474 * The callback must return the true current byte offset of the output to
475 * which the encoder is writing. If you are buffering the output, make
476 * sure and take this into account. If you are writing directly to a
477 * FILE* from your write callback, ftell() is sufficient. If you are
478 * writing directly to a file descriptor from your write callback, you
479 * can use lseek(fd, SEEK_CUR, 0). The encoder may later seek back to
480 * these points to rewrite metadata after encoding.
482 * \note In general, FLAC__StreamEncoder functions which change the
483 * state should not be called on the \a encoder while in the callback.
485 * \param encoder The encoder instance calling the callback.
486 * \param absolute_byte_offset The address at which to store the current
487 * position of the output.
488 * \param client_data The callee's client data set through
489 * FLAC__stream_encoder_init_*().
490 * \retval FLAC__StreamEncoderTellStatus
491 * The callee's return status.
493 typedef FLAC__StreamEncoderTellStatus (*FLAC__StreamEncoderTellCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
495 /** Signature for the metadata callback.
497 * A function pointer matching this signature may be passed to
498 * FLAC__stream_encoder_init_stream(). The supplied function will be called
499 * once at the end of encoding with the populated STREAMINFO structure. This
500 * is so the client can seek back to the beginning of the file and write the
501 * STREAMINFO block with the correct statistics after encoding (like
502 * minimum/maximum frame size and total samples).
504 * \note In general, FLAC__StreamEncoder functions which change the
505 * state should not be called on the \a encoder while in the callback.
507 * \param encoder The encoder instance calling the callback.
508 * \param metadata The final populated STREAMINFO block.
509 * \param client_data The callee's client data set through
510 * FLAC__stream_encoder_init_*().
512 typedef void (*FLAC__StreamEncoderMetadataCallback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data);
514 /** Signature for the progress callback.
516 * A function pointer matching this signature may be passed to
517 * FLAC__stream_encoder_init_file() or FLAC__stream_encoder_init_FILE().
518 * The supplied function will be called when the encoder has finished
519 * writing a frame. The \c total_frames_estimate argument to the
520 * callback will be based on the value from
521 * FLAC__file_encoder_set_total_samples_estimate().
523 * \note In general, FLAC__StreamEncoder functions which change the
524 * state should not be called on the \a encoder while in the callback.
526 * \param encoder The encoder instance calling the callback.
527 * \param bytes_written Bytes written so far.
528 * \param samples_written Samples written so far.
529 * \param frames_written Frames written so far.
530 * \param total_frames_estimate The estimate of the total number of
531 * frames to be written.
532 * \param client_data The callee's client data set through
533 * FLAC__stream_encoder_init_*().
535 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);
538 /***********************************************************************
540 * Class constructor/destructor
542 ***********************************************************************/
544 /** Create a new stream encoder instance. The instance is created with
545 * default settings; see the individual FLAC__stream_encoder_set_*()
546 * functions for each setting's default.
548 * \retval FLAC__StreamEncoder*
549 * \c NULL if there was an error allocating memory, else the new instance.
551 FLAC_API FLAC__StreamEncoder *FLAC__stream_encoder_new();
553 /** Free an encoder instance. Deletes the object pointed to by \a encoder.
555 * \param encoder A pointer to an existing encoder.
557 * \code encoder != NULL \endcode
559 FLAC_API void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder);
562 /***********************************************************************
564 * Public class method prototypes
566 ***********************************************************************/
568 /** Set the "verify" flag. If \c true, the encoder will verify it's own
569 * encoded output by feeding it through an internal decoder and comparing
570 * the original signal against the decoded signal. If a mismatch occurs,
571 * the process call will return \c false. Note that this will slow the
572 * encoding process by the extra time required for decoding and comparison.
575 * \param encoder An encoder instance to set.
576 * \param value Flag value (see above).
578 * \code encoder != NULL \endcode
580 * \c false if the encoder is already initialized, else \c true.
582 FLAC_API FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value);
584 /** Set the "streamable subset" flag. If \c true, the encoder will comply
585 * with the subset (see the format specification) and will check the
586 * settings during FLAC__stream_encoder_init() to see if all settings
587 * comply. If \c false, the settings may take advantage of the full
588 * range that the format allows.
590 * Make sure you know what it entails before setting this to \c false.
593 * \param encoder An encoder instance to set.
594 * \param value Flag value (see above).
596 * \code encoder != NULL \endcode
598 * \c false if the encoder is already initialized, else \c true.
600 FLAC_API FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value);
602 /** Set to \c true to enable mid-side encoding on stereo input. The
603 * number of channels must be 2. Set to \c false to use only
604 * independent channel coding.
607 * \param encoder An encoder instance to set.
608 * \param value Flag value (see above).
610 * \code encoder != NULL \endcode
612 * \c false if the encoder is already initialized, else \c true.
614 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
616 /** Set to \c true to enable adaptive switching between mid-side and
617 * left-right encoding on stereo input. The number of channels must
618 * be 2. Set to \c false to use exhaustive searching. In either
619 * case, the mid/side stereo setting must be \c true.
622 * \param encoder An encoder instance to set.
623 * \param value Flag value (see above).
625 * \code encoder != NULL \endcode
627 * \c false if the encoder is already initialized, else \c true.
629 FLAC_API FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
631 /** Set the number of channels to be encoded.
634 * \param encoder An encoder instance to set.
635 * \param value See above.
637 * \code encoder != NULL \endcode
639 * \c false if the encoder is already initialized, else \c true.
641 FLAC_API FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value);
643 /** Set the sample resolution of the input to be encoded.
646 * Do not feed the encoder data that is wider than the value you
647 * set here or you will generate an invalid stream.
650 * \param encoder An encoder instance to set.
651 * \param value See above.
653 * \code encoder != NULL \endcode
655 * \c false if the encoder is already initialized, else \c true.
657 FLAC_API FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value);
659 /** Set the sample rate (in Hz) of the input to be encoded.
662 * \param encoder An encoder instance to set.
663 * \param value See above.
665 * \code encoder != NULL \endcode
667 * \c false if the encoder is already initialized, else \c true.
669 FLAC_API FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value);
671 /** Set the blocksize to use while encoding.
674 * \param encoder An encoder instance to set.
675 * \param value See above.
677 * \code encoder != NULL \endcode
679 * \c false if the encoder is already initialized, else \c true.
681 FLAC_API FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value);
683 /** Sets the apodization function(s) the encoder will use when windowing
684 * audio data for LPC analysis.
686 * The \a specification is a plain ASCII string which specifies exactly
687 * which functions to use. There may be more than one (up to 32),
688 * separated by \c ';' characters. Some functions take one or more
689 * comma-separated arguments in parentheses.
691 * The available functions are \c bartlett, \c bartlett_hann,
692 * \c blackman, \c blackman_harris_4term_92db, \c connes, \c flattop,
693 * \c gauss(STDDEV), \c hamming, \c hann, \c kaiser_bessel, \c nuttall,
694 * \c rectangle, \c triangle, \c tukey(P), \c welch.
696 * For \c gauss(STDDEV), STDDEV specifies the standard deviation
699 * For \c tukey(P), P specifies the fraction of the window that is
700 * tapered (0<=P<=1). P=0 corresponds to \c rectangle and P=1
701 * corresponds to \c hann.
703 * Example specifications are \c "blackman" or
704 * \c "hann;triangle;tukey(0.5);tukey(0.25);tukey(0.125)"
706 * Any function that is specified erroneously is silently dropped. Up
707 * to 32 functions are kept, the rest are dropped. If the specification
708 * is empty the encoder defaults to \c "tukey(0.5)".
710 * When more than one function is specified, then for every subframe the
711 * encoder will try each of them separately and choose the window that
712 * results in the smallest compressed subframe.
714 * Note that each function specified causes the encoder to occupy a
715 * floating point array in which to store the window.
717 * \default \c "tukey(0.5)"
718 * \param encoder An encoder instance to set.
719 * \param specification See above.
721 * \code encoder != NULL \endcode
722 * \code specification != NULL \endcode
724 * \c false if the encoder is already initialized, else \c true.
726 /* @@@@add to unit tests*/
727 FLAC_API FLAC__bool FLAC__stream_encoder_set_apodization(FLAC__StreamEncoder *encoder, const char *specification);
729 /** Set the maximum LPC order, or \c 0 to use only the fixed predictors.
732 * \param encoder An encoder instance to set.
733 * \param value See above.
735 * \code encoder != NULL \endcode
737 * \c false if the encoder is already initialized, else \c true.
739 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value);
741 /** Set the precision, in bits, of the quantized linear predictor
742 * coefficients, or \c 0 to let the encoder select it based on the
746 * In the current implementation, qlp_coeff_precision + bits_per_sample must
750 * \param encoder An encoder instance to set.
751 * \param value See above.
753 * \code encoder != NULL \endcode
755 * \c false if the encoder is already initialized, else \c true.
757 FLAC_API FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value);
759 /** Set to \c false to use only the specified quantized linear predictor
760 * coefficient precision, or \c true to search neighboring precision
761 * values and use the best one.
764 * \param encoder An encoder instance to set.
765 * \param value See above.
767 * \code encoder != NULL \endcode
769 * \c false if the encoder is already initialized, else \c true.
771 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
773 /** Deprecated. Setting this value has no effect.
776 * \param encoder An encoder instance to set.
777 * \param value See above.
779 * \code encoder != NULL \endcode
781 * \c false if the encoder is already initialized, else \c true.
783 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value);
785 /** Set to \c false to let the encoder estimate the best model order
786 * based on the residual signal energy, or \c true to force the
787 * encoder to evaluate all order models and select the best.
790 * \param encoder An encoder instance to set.
791 * \param value See above.
793 * \code encoder != NULL \endcode
795 * \c false if the encoder is already initialized, else \c true.
797 FLAC_API FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
799 /** Set the minimum partition order to search when coding the residual.
800 * This is used in tandem with
801 * FLAC__stream_encoder_set_max_residual_partition_order().
803 * The partition order determines the context size in the residual.
804 * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
806 * Set both min and max values to \c 0 to force a single context,
807 * whose Rice parameter is based on the residual signal variance.
808 * Otherwise, set a min and max order, and the encoder will search
809 * all orders, using the mean of each context for its Rice parameter,
813 * \param encoder An encoder instance to set.
814 * \param value See above.
816 * \code encoder != NULL \endcode
818 * \c false if the encoder is already initialized, else \c true.
820 FLAC_API FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
822 /** Set the maximum partition order to search when coding the residual.
823 * This is used in tandem with
824 * FLAC__stream_encoder_set_min_residual_partition_order().
826 * The partition order determines the context size in the residual.
827 * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
829 * Set both min and max values to \c 0 to force a single context,
830 * whose Rice parameter is based on the residual signal variance.
831 * Otherwise, set a min and max order, and the encoder will search
832 * all orders, using the mean of each context for its Rice parameter,
836 * \param encoder An encoder instance to set.
837 * \param value See above.
839 * \code encoder != NULL \endcode
841 * \c false if the encoder is already initialized, else \c true.
843 FLAC_API FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
845 /** Deprecated. Setting this value has no effect.
848 * \param encoder An encoder instance to set.
849 * \param value See above.
851 * \code encoder != NULL \endcode
853 * \c false if the encoder is already initialized, else \c true.
855 FLAC_API FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value);
857 /** Set an estimate of the total samples that will be encoded.
858 * This is merely an estimate and may be set to \c 0 if unknown.
859 * This value will be written to the STREAMINFO block before encoding,
860 * and can remove the need for the caller to rewrite the value later
861 * if the value is known before encoding.
864 * \param encoder An encoder instance to set.
865 * \param value See above.
867 * \code encoder != NULL \endcode
869 * \c false if the encoder is already initialized, else \c true.
871 FLAC_API FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value);
873 /** Set the metadata blocks to be emitted to the stream before encoding.
874 * A value of \c NULL, \c 0 implies no metadata; otherwise, supply an
875 * array of pointers to metadata blocks. The array is non-const since
876 * the encoder may need to change the \a is_last flag inside them, and
877 * in some cases update seek point offsets. Otherwise, the encoder will
878 * not modify or free the blocks. It is up to the caller to free the
879 * metadata blocks after encoding.
882 * The encoder stores only the \a metadata pointer; the passed-in array
883 * must survive at least until after FLAC__stream_encoder_init() returns.
884 * Do not modify the array or free the blocks until then.
887 * The STREAMINFO block is always written and no STREAMINFO block may
888 * occur in the supplied array.
891 * By default the encoder does not create a SEEKTABLE. If one is supplied
892 * in the \a metadata array, but the client has specified that it does not
893 * support seeking, then the SEEKTABLE will be written verbatim. However
894 * by itself this is not very useful as the client will not know the stream
895 * offsets for the seekpoints ahead of time. In order to get a proper
896 * seektable the client must support seeking. See next note.
899 * SEEKTABLE blocks are handled specially. Since you will not know
900 * the values for the seek point stream offsets, you should pass in
901 * a SEEKTABLE 'template', that is, a SEEKTABLE object with the
902 * required sample numbers (or placeholder points), with \c 0 for the
903 * \a frame_samples and \a stream_offset fields for each point. If the
904 * client has specified that it supports seeking by providing a seek
905 * callback to FLAC__stream_encoder_init_stream() (or by using
906 * FLAC__stream_encoder_init_file() or FLAC__stream_encoder_init_FILE()),
907 * then while it is encoding the encoder will fill the stream offsets in
908 * for you and when encoding is finished, it will seek back and write the
909 * real values into the SEEKTABLE block in the stream. There are helper
910 * routines for manipulating seektable template blocks; see metadata.h:
911 * FLAC__metadata_object_seektable_template_*(). If the client does
912 * not support seeking, the SEEKTABLE will have inaccurate offsets which
913 * will slow down or remove the ability to seek in the FLAC stream.
916 * The encoder instance \b will modify the first \c SEEKTABLE block
917 * as it transforms the template to a valid seektable while encoding,
918 * but it is still up to the caller to free all metadata blocks after
922 * A VORBIS_COMMENT block may be supplied. The vendor string in it
923 * will be ignored. libFLAC will use it's own vendor string. libFLAC
924 * will not modify the passed-in VORBIS_COMMENT's vendor string, it
925 * will simply write it's own into the stream. If no VORBIS_COMMENT
926 * block is present in the \a metadata array, libFLAC will write an
927 * empty one, containing only the vendor string.
929 * \default \c NULL, 0
930 * \param encoder An encoder instance to set.
931 * \param metadata See above.
932 * \param num_blocks See above.
934 * \code encoder != NULL \endcode
936 * \c false if the encoder is already initialized, else \c true.
938 FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks);
940 /** Get the current encoder state.
942 * \param encoder An encoder instance to query.
944 * \code encoder != NULL \endcode
945 * \retval FLAC__StreamEncoderState
946 * The current encoder state.
948 FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder);
950 /** Get the state of the verify stream decoder.
951 * Useful when the stream encoder state is
952 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR.
954 * \param encoder An encoder instance to query.
956 * \code encoder != NULL \endcode
957 * \retval FLAC__StreamDecoderState
958 * The verify stream decoder state.
960 FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder);
962 /** Get the current encoder state as a C string.
963 * This version automatically resolves
964 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR by getting the
965 * verify decoder's state.
967 * \param encoder A encoder instance to query.
969 * \code encoder != NULL \endcode
970 * \retval const char *
971 * The encoder state as a C string. Do not modify the contents.
973 FLAC_API const char *FLAC__stream_encoder_get_resolved_state_string(const FLAC__StreamEncoder *encoder);
975 /** Get relevant values about the nature of a verify decoder error.
976 * Useful when the stream encoder state is
977 * \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR. The arguments should
978 * be addresses in which the stats will be returned, or NULL if value
981 * \param encoder An encoder instance to query.
982 * \param absolute_sample The absolute sample number of the mismatch.
983 * \param frame_number The number of the frame in which the mismatch occurred.
984 * \param channel The channel in which the mismatch occurred.
985 * \param sample The number of the sample (relative to the frame) in
986 * which the mismatch occurred.
987 * \param expected The expected value for the sample in question.
988 * \param got The actual value returned by the decoder.
990 * \code encoder != NULL \endcode
992 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);
994 /** Get the "verify" flag.
996 * \param encoder An encoder instance to query.
998 * \code encoder != NULL \endcode
1000 * See FLAC__stream_encoder_set_verify().
1002 FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder);
1004 /** Get the "streamable subset" flag.
1006 * \param encoder An encoder instance to query.
1008 * \code encoder != NULL \endcode
1009 * \retval FLAC__bool
1010 * See FLAC__stream_encoder_set_streamable_subset().
1012 FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder);
1014 /** Get the "mid/side stereo coding" flag.
1016 * \param encoder An encoder instance to query.
1018 * \code encoder != NULL \endcode
1019 * \retval FLAC__bool
1020 * See FLAC__stream_encoder_get_do_mid_side_stereo().
1022 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder);
1024 /** Get the "adaptive mid/side switching" flag.
1026 * \param encoder An encoder instance to query.
1028 * \code encoder != NULL \endcode
1029 * \retval FLAC__bool
1030 * See FLAC__stream_encoder_set_loose_mid_side_stereo().
1032 FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder);
1034 /** Get the number of input channels being processed.
1036 * \param encoder An encoder instance to query.
1038 * \code encoder != NULL \endcode
1040 * See FLAC__stream_encoder_set_channels().
1042 FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder);
1044 /** Get the input sample resolution setting.
1046 * \param encoder An encoder instance to query.
1048 * \code encoder != NULL \endcode
1050 * See FLAC__stream_encoder_set_bits_per_sample().
1052 FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder);
1054 /** Get the input sample rate setting.
1056 * \param encoder An encoder instance to query.
1058 * \code encoder != NULL \endcode
1060 * See FLAC__stream_encoder_set_sample_rate().
1062 FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder);
1064 /** Get the blocksize setting.
1066 * \param encoder An encoder instance to query.
1068 * \code encoder != NULL \endcode
1070 * See FLAC__stream_encoder_set_blocksize().
1072 FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder);
1074 /** Get the maximum LPC order setting.
1076 * \param encoder An encoder instance to query.
1078 * \code encoder != NULL \endcode
1080 * See FLAC__stream_encoder_set_max_lpc_order().
1082 FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder);
1084 /** Get the quantized linear predictor coefficient precision setting.
1086 * \param encoder An encoder instance to query.
1088 * \code encoder != NULL \endcode
1090 * See FLAC__stream_encoder_set_qlp_coeff_precision().
1092 FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder);
1094 /** Get the qlp coefficient precision search flag.
1096 * \param encoder An encoder instance to query.
1098 * \code encoder != NULL \endcode
1099 * \retval FLAC__bool
1100 * See FLAC__stream_encoder_set_do_qlp_coeff_prec_search().
1102 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder);
1104 /** Get the "escape coding" flag.
1106 * \param encoder An encoder instance to query.
1108 * \code encoder != NULL \endcode
1109 * \retval FLAC__bool
1110 * See FLAC__stream_encoder_set_do_escape_coding().
1112 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder);
1114 /** Get the exhaustive model search flag.
1116 * \param encoder An encoder instance to query.
1118 * \code encoder != NULL \endcode
1119 * \retval FLAC__bool
1120 * See FLAC__stream_encoder_set_do_exhaustive_model_search().
1122 FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder);
1124 /** Get the minimum residual partition order setting.
1126 * \param encoder An encoder instance to query.
1128 * \code encoder != NULL \endcode
1130 * See FLAC__stream_encoder_set_min_residual_partition_order().
1132 FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder);
1134 /** Get maximum residual partition order setting.
1136 * \param encoder An encoder instance to query.
1138 * \code encoder != NULL \endcode
1140 * See FLAC__stream_encoder_set_max_residual_partition_order().
1142 FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder);
1144 /** Get the Rice parameter search distance setting.
1146 * \param encoder An encoder instance to query.
1148 * \code encoder != NULL \endcode
1150 * See FLAC__stream_encoder_set_rice_parameter_search_dist().
1152 FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder);
1154 /** Get the previously set estimate of the total samples to be encoded.
1155 * The encoder merely mimics back the value given to
1156 * FLAC__stream_encoder_set_total_samples_estimate() since it has no
1157 * other way of knowing how many samples the user will encode.
1159 * \param encoder An encoder instance to set.
1161 * \code encoder != NULL \endcode
1162 * \retval FLAC__uint64
1163 * See FLAC__stream_encoder_get_total_samples_estimate().
1165 FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder);
1167 /** Initialize the encoder instance.
1169 * This flavor of initialization sets up the encoder to encode to a stream.
1170 * I/O is performed via callbacks to the client. For encoding to a plain file
1171 * via filename or open \c FILE*, FLAC__stream_encoder_init_file() and
1172 * FLAC__stream_encoder_init_FILE() provide a simpler interface.
1174 * This function should be called after FLAC__stream_encoder_new() and
1175 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
1176 * or FLAC__stream_encoder_process_interleaved().
1177 * initialization succeeded.
1179 * The call to FLAC__stream_encoder_init_stream() currently will also immediately
1180 * call the write callback several times, once with the \c fLaC signature,
1181 * and once for each encoded metadata block.
1183 * \param encoder An uninitialized encoder instance.
1184 * \param write_callback See FLAC__StreamEncoderWriteCallback. This
1185 * pointer must not be \c NULL.
1186 * \param seek_callback See FLAC__StreamEncoderSeekCallback. This
1187 * pointer may be \c NULL if seeking is not
1188 * supported. The encoder uses seeking to go back
1189 * and write some some stream statistics to the
1190 * STREAMINFO block; this is recommended but not
1191 * necessary to create a valid FLAC stream. If
1192 * \a seek_callback is not \c NULL then a
1193 * \a tell_callback must also be supplied.
1194 * Alternatively, a dummy seek callback that just
1195 * returns \c FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED
1196 * may also be supplied, all though this is slightly
1197 * less efficient for the decoder.
1198 * \param tell_callback See FLAC__StreamEncoderTellCallback. This
1199 * pointer may be \c NULL if seeking is not
1200 * supported. If \a seek_callback is \c NULL then
1201 * this argument will be ignored. If
1202 * \a seek_callback is not \c NULL then a
1203 * \a tell_callback must also be supplied.
1204 * Alternatively, a dummy tell callback that just
1205 * returns \c FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED
1206 * may also be supplied, all though this is slightly
1207 * less efficient for the decoder.
1208 * \param metadata_callback See FLAC__StreamEncoderMetadataCallback. This
1209 * pointer may be \c NULL if the callback is not
1210 * desired. If the client provides a seek callback,
1211 * this function is not necessary as the encoder
1212 * will automatically seek back and update the
1213 * STREAMINFO block. It may also be \c NULL if the
1214 * client does not support seeking, since it will
1215 * have no way of going back to update the
1216 * STREAMINFO. However the client can still supply
1217 * a callback if it would like to know the details
1218 * from the STREAMINFO.
1219 * \param client_data This value will be supplied to callbacks in their
1220 * \a client_data argument.
1222 * \code encoder != NULL \endcode
1223 * \retval FLAC__StreamEncoderInitStatus
1224 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
1225 * see FLAC__StreamEncoderInitStatus for the meanings of other return values.
1227 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);
1229 /** Initialize the encoder instance.
1231 * This flavor of initialization sets up the encoder to encode to a plain
1232 * file. For non-stdio streams, you must use
1233 * FLAC__stream_encoder_init_stream() and provide callbacks for the I/O.
1235 * This function should be called after FLAC__stream_encoder_new() and
1236 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
1237 * or FLAC__stream_encoder_process_interleaved().
1238 * initialization succeeded.
1240 * The call to FLAC__stream_encoder_init_stream() currently will also immediately
1241 * call the write callback several times, once with the \c fLaC signature,
1242 * and once for each encoded metadata block.
1244 * \param encoder An uninitialized encoder instance.
1245 * \param file An open file. The file should have been opened
1246 * with mode \c "w+b" and rewound. The file
1247 * becomes owned by the encoder and should not be
1248 * manipulated by the client while encoding.
1249 * Unless \a file is \c stdout, it will be closed
1250 * when FLAC__stream_encoder_finish() is called.
1251 * Note however that a proper SEEKTABLE cannot be
1252 * created when encoding to \c stdout since it is
1254 * \param progress_callback See FLAC__StreamEncoderProgressCallback. This
1255 * pointer may be \c NULL if the callback is not
1257 * \param client_data This value will be supplied to callbacks in their
1258 * \a client_data argument.
1260 * \code encoder != NULL \endcode
1261 * \code file != NULL \endcode
1262 * \retval FLAC__StreamEncoderInitStatus
1263 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
1264 * see FLAC__StreamEncoderInitStatus for the meanings of other return values.
1266 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_FILE(FLAC__StreamEncoder *encoder, FILE *file, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data);
1268 /** Initialize the encoder instance.
1270 * This flavor of initialization sets up the encoder to encode to a plain
1271 * file. If POSIX fopen() semantics are not sufficient (for example,
1272 * with Unicode filenames on Windows), you must use
1273 * FLAC__stream_encodeR_init_FILE(), or FLAC__stream_encoder_init_stream()
1274 * and provide callbacks for the I/O.
1276 * This function should be called after FLAC__stream_encoder_new() and
1277 * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
1278 * or FLAC__stream_encoder_process_interleaved().
1279 * initialization succeeded.
1281 * The call to FLAC__stream_encoder_init_stream() currently will also immediately
1282 * call the write callback several times, once with the \c fLaC signature,
1283 * and once for each encoded metadata block.
1285 * \param encoder An uninitialized encoder instance.
1286 * \param filename The name of the file to encode to. The file will
1287 * be opened with fopen(). Use \c NULL to encode to
1288 * \c stdout. Note however that a proper SEEKTABLE
1289 * cannot be created when encoding to \c stdout since
1290 * it is not seekable.
1291 * \param progress_callback See FLAC__StreamEncoderProgressCallback. This
1292 * pointer may be \c NULL if the callback is not
1294 * \param client_data This value will be supplied to callbacks in their
1295 * \a client_data argument.
1297 * \code encoder != NULL \endcode
1298 * \retval FLAC__StreamEncoderInitStatus
1299 * \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
1300 * see FLAC__StreamEncoderInitStatus for the meanings of other return values.
1302 FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_file(FLAC__StreamEncoder *encoder, const char *filename, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data);
1304 /** Finish the encoding process.
1305 * Flushes the encoding buffer, releases resources, resets the encoder
1306 * settings to their defaults, and returns the encoder state to
1307 * FLAC__STREAM_ENCODER_UNINITIALIZED. Note that this can generate
1308 * one or more write callbacks before returning, and will generate
1309 * a metadata callback.
1311 * In the event of a prematurely-terminated encode, it is not strictly
1312 * necessary to call this immediately before FLAC__stream_encoder_delete()
1313 * but it is good practice to match every FLAC__stream_encoder_init()
1314 * with a FLAC__stream_encoder_finish().
1316 * \param encoder An uninitialized encoder instance.
1318 * \code encoder != NULL \endcode
1320 FLAC_API void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder);
1322 /** Submit data for encoding.
1323 * This version allows you to supply the input data via an array of
1324 * pointers, each pointer pointing to an array of \a samples samples
1325 * representing one channel. The samples need not be block-aligned,
1326 * but each channel should have the same number of samples.
1328 * \param encoder An initialized encoder instance in the OK state.
1329 * \param buffer An array of pointers to each channel's signal.
1330 * \param samples The number of samples in one channel.
1332 * \code encoder != NULL \endcode
1333 * \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
1334 * \retval FLAC__bool
1335 * \c true if successful, else \c false; in this case, check the
1336 * encoder state with FLAC__stream_encoder_get_state() to see what
1339 FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples);
1341 /** Submit data for encoding.
1342 * This version allows you to supply the input data where the channels
1343 * are interleaved into a single array (i.e. channel0_sample0,
1344 * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
1345 * The samples need not be block-aligned but they must be
1346 * sample-aligned, i.e. the first value should be channel0_sample0
1347 * and the last value channelN_sampleM.
1349 * \param encoder An initialized encoder instance in the OK state.
1350 * \param buffer An array of channel-interleaved data (see above).
1351 * \param samples The number of samples in one channel, the same as for
1352 * FLAC__stream_encoder_process(). For example, if
1353 * encoding two channels, \c 1000 \a samples corresponds
1354 * to a \a buffer of 2000 values.
1356 * \code encoder != NULL \endcode
1357 * \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
1358 * \retval FLAC__bool
1359 * \c true if successful, else \c false; in this case, check the
1360 * encoder state with FLAC__stream_encoder_get_state() to see what
1363 FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples);