1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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32 #ifndef FLAC__FILE_DECODER_H
33 #define FLAC__FILE_DECODER_H
36 #include "seekable_stream_decoder.h"
43 /** \file include/FLAC/file_decoder.h
46 * This module contains the functions which implement the file
49 * See the detailed documentation in the
50 * \link flac_file_decoder file decoder \endlink module.
53 /** \defgroup flac_file_decoder FLAC/file_decoder.h: file decoder interface
54 * \ingroup flac_decoder
57 * This module contains the functions which implement the file
60 * The basic usage of this decoder is as follows:
61 * - The program creates an instance of a decoder using
62 * FLAC__file_decoder_new().
63 * - The program overrides the default settings and sets callbacks for
64 * writing, error reporting, and metadata reporting using
65 * FLAC__file_decoder_set_*() functions.
66 * - The program initializes the instance to validate the settings and
67 * prepare for decoding using FLAC__file_decoder_init().
68 * - The program calls the FLAC__file_decoder_process_*() functions
69 * to decode data, which subsequently calls the callbacks.
70 * - The program finishes the decoding with FLAC__file_decoder_finish(),
71 * which flushes the input and output and resets the decoder to the
72 * uninitialized state.
73 * - The instance may be used again or deleted with
74 * FLAC__file_decoder_delete().
76 * The file decoder is a trivial wrapper around the
77 * \link flac_seekable_stream_decoder seekable stream decoder \endlink
78 * meant to simplfy the process of decoding from a standard file. The
79 * file decoder supplies all but the Write/Metadata/Error callbacks.
80 * The user needs only to provide the path to the file and the file
81 * decoder handles the rest.
83 * Like the seekable stream decoder, seeking is exposed through the
84 * FLAC__file_decoder_seek_absolute() method. At any point after the file
85 * decoder has been initialized, the user can call this function to seek to
86 * an exact sample within the file. Subsequently, the first time the write
87 * callback is called it will be passed a (possibly partial) block starting
90 * The file decoder also inherits MD5 signature checking from the seekable
91 * stream decoder. If this is turned on before initialization,
92 * FLAC__file_decoder_finish() will report when the decoded MD5 signature
93 * does not match the one stored in the STREAMINFO block. MD5 checking is
94 * automatically turned off if there is no signature in the STREAMINFO
95 * block or when a seek is attempted.
97 * Make sure to read the detailed descriptions of the
98 * \link flac_seekable_stream_decoder seekable stream decoder module \endlink
99 * and \link flac_stream_decoder stream decoder module \endlink
100 * since the file decoder inherits much of its behavior from them.
103 * The "set" functions may only be called when the decoder is in the
104 * state FLAC__FILE_DECODER_UNINITIALIZED, i.e. after
105 * FLAC__file_decoder_new() or FLAC__file_decoder_finish(), but
106 * before FLAC__file_decoder_init(). If this is the case they will
107 * return \c true, otherwise \c false.
110 * FLAC__file_decoder_finish() resets all settings to the constructor
111 * defaults, including the callbacks.
117 /** State values for a FLAC__FileDecoder
119 * The decoder's state can be obtained by calling FLAC__file_decoder_get_state().
123 FLAC__FILE_DECODER_OK = 0,
124 /**< The decoder is in the normal OK state. */
126 FLAC__FILE_DECODER_END_OF_FILE,
127 /**< The decoder has reached the end of the file. */
129 FLAC__FILE_DECODER_ERROR_OPENING_FILE,
130 /**< An error occurred opening the input file. */
132 FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR,
133 /**< An error occurred allocating memory. */
135 FLAC__FILE_DECODER_SEEK_ERROR,
136 /**< An error occurred while seeking. */
138 FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR,
139 /**< An error occurred in the underlying seekable stream decoder. */
141 FLAC__FILE_DECODER_ALREADY_INITIALIZED,
142 /**< FLAC__file_decoder_init() was called when the decoder was already
143 * initialized, usually because FLAC__file_decoder_finish() was not
147 FLAC__FILE_DECODER_INVALID_CALLBACK,
148 /**< FLAC__file_decoder_init() was called without all callbacks
152 FLAC__FILE_DECODER_UNINITIALIZED
153 /**< The decoder is in the uninitialized state. */
155 } FLAC__FileDecoderState;
157 /** Maps a FLAC__FileDecoderState to a C string.
159 * Using a FLAC__FileDecoderState as the index to this array
160 * will give the string equivalent. The contents should not be modified.
162 extern FLAC_API const char * const FLAC__FileDecoderStateString[];
165 /***********************************************************************
167 * class FLAC__FileDecoder : public FLAC__StreamDecoder
169 ***********************************************************************/
171 struct FLAC__FileDecoderProtected;
172 struct FLAC__FileDecoderPrivate;
173 /** The opaque structure definition for the file decoder type. See the
174 * \link flac_file_decoder file decoder module \endlink for a detailed
178 struct FLAC__FileDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
179 struct FLAC__FileDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
182 /** Signature for the write callback.
183 * See FLAC__file_decoder_set_write_callback()
184 * and FLAC__SeekableStreamDecoderWriteCallback for more info.
186 * \param decoder The decoder instance calling the callback.
187 * \param frame The description of the decoded frame.
188 * \param buffer An array of pointers to decoded channels of data.
189 * \param client_data The callee's client data set through
190 * FLAC__file_decoder_set_client_data().
191 * \retval FLAC__StreamDecoderWriteStatus
192 * The callee's return status.
194 typedef FLAC__StreamDecoderWriteStatus (*FLAC__FileDecoderWriteCallback)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
196 /** Signature for the metadata callback.
197 * See FLAC__file_decoder_set_metadata_callback()
198 * and FLAC__SeekableStreamDecoderMetadataCallback for more info.
200 * \param decoder The decoder instance calling the callback.
201 * \param metadata The decoded metadata block.
202 * \param client_data The callee's client data set through
203 * FLAC__file_decoder_set_client_data().
205 typedef void (*FLAC__FileDecoderMetadataCallback)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
207 /** Signature for the error callback.
208 * See FLAC__file_decoder_set_error_callback()
209 * and FLAC__SeekableStreamDecoderErrorCallback for more info.
211 * \param decoder The decoder instance calling the callback.
212 * \param status The error encountered by the decoder.
213 * \param client_data The callee's client data set through
214 * FLAC__file_decoder_set_client_data().
216 typedef void (*FLAC__FileDecoderErrorCallback)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
219 /***********************************************************************
221 * Class constructor/destructor
223 ***********************************************************************/
225 /** Create a new file decoder instance. The instance is created with
226 * default settings; see the individual FLAC__file_decoder_set_*()
227 * functions for each setting's default.
229 * \retval FLAC__FileDecoder*
230 * \c NULL if there was an error allocating memory, else the new instance.
232 FLAC_API FLAC__FileDecoder *FLAC__file_decoder_new();
234 /** Free a decoder instance. Deletes the object pointed to by \a decoder.
236 * \param decoder A pointer to an existing decoder.
238 * \code decoder != NULL \endcode
240 FLAC_API void FLAC__file_decoder_delete(FLAC__FileDecoder *decoder);
243 /***********************************************************************
245 * Public class method prototypes
247 ***********************************************************************/
249 /** Set the "MD5 signature checking" flag.
250 * This is inherited from FLAC__SeekableStreamDecoder; see
251 * FLAC__seekable_stream_decoder_set_md5_checking().
254 * \param decoder A decoder instance to set.
255 * \param value See above.
257 * \code decoder != NULL \endcode
259 * \c false if the decoder is already initialized, else \c true.
261 FLAC_API FLAC__bool FLAC__file_decoder_set_md5_checking(FLAC__FileDecoder *decoder, FLAC__bool value);
263 /** Set the input file name to decode.
266 * \param decoder A decoder instance to set.
267 * \param value The input file name, or "-" for \c stdin.
269 * \code decoder != NULL \endcode
270 * \code value != NULL \endcode
272 * \c false if the decoder is already initialized, or there was a memory
273 * allocation error, else \c true.
275 FLAC_API FLAC__bool FLAC__file_decoder_set_filename(FLAC__FileDecoder *decoder, const char *value);
277 /** Set the write callback.
278 * This is inherited from FLAC__SeekableStreamDecoder; see
279 * FLAC__seekable_stream_decoder_set_write_callback().
282 * The callback is mandatory and must be set before initialization.
285 * \param decoder A decoder instance to set.
286 * \param value See above.
288 * \code decoder != NULL \endcode
289 * \code value != NULL \endcode
291 * \c false if the decoder is already initialized, else \c true.
293 FLAC_API FLAC__bool FLAC__file_decoder_set_write_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderWriteCallback value);
295 /** Set the metadata callback.
296 * This is inherited from FLAC__SeekableStreamDecoder; see
297 * FLAC__seekable_stream_decoder_set_metadata_callback().
300 * The callback is mandatory and must be set before initialization.
303 * \param decoder A decoder instance to set.
304 * \param value See above.
306 * \code decoder != NULL \endcode
307 * \code value != NULL \endcode
309 * \c false if the decoder is already initialized, else \c true.
311 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderMetadataCallback value);
313 /** Set the error callback.
314 * This is inherited from FLAC__SeekableStreamDecoder; see
315 * FLAC__seekable_stream_decoder_set_error_callback().
318 * The callback is mandatory and must be set before initialization.
321 * \param decoder A decoder instance to set.
322 * \param value See above.
324 * \code decoder != NULL \endcode
325 * \code value != NULL \endcode
327 * \c false if the decoder is already initialized, else \c true.
329 FLAC_API FLAC__bool FLAC__file_decoder_set_error_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderErrorCallback value);
331 /** Set the client data to be passed back to callbacks.
332 * This value will be supplied to callbacks in their \a client_data
336 * \param decoder A decoder instance to set.
337 * \param value See above.
339 * \code decoder != NULL \endcode
341 * \c false if the decoder is already initialized, else \c true.
343 FLAC_API FLAC__bool FLAC__file_decoder_set_client_data(FLAC__FileDecoder *decoder, void *value);
345 /** This is inherited from FLAC__SeekableStreamDecoder; see
346 * FLAC__seekable_stream_decoder_set_metadata_respond().
348 * \default By default, only the \c STREAMINFO block is returned via the
350 * \param decoder A decoder instance to set.
351 * \param type See above.
353 * \code decoder != NULL \endcode
356 * \c false if the decoder is already initialized, else \c true.
358 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond(FLAC__FileDecoder *decoder, FLAC__MetadataType type);
360 /** This is inherited from FLAC__SeekableStreamDecoder; see
361 * FLAC__seekable_stream_decoder_set_metadata_respond_application().
363 * \default By default, only the \c STREAMINFO block is returned via the
365 * \param decoder A decoder instance to set.
366 * \param id See above.
368 * \code decoder != NULL \endcode
369 * \code id != NULL \endcode
371 * \c false if the decoder is already initialized, else \c true.
373 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4]);
375 /** This is inherited from FLAC__SeekableStreamDecoder; see
376 * FLAC__seekable_stream_decoder_set_metadata_respond_all().
378 * \default By default, only the \c STREAMINFO block is returned via the
380 * \param decoder A decoder instance to set.
382 * \code decoder != NULL \endcode
384 * \c false if the decoder is already initialized, else \c true.
386 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_respond_all(FLAC__FileDecoder *decoder);
388 /** This is inherited from FLAC__SeekableStreamDecoder; see
389 * FLAC__seekable_stream_decoder_set_metadata_ignore().
391 * \default By default, only the \c STREAMINFO block is returned via the
393 * \param decoder A decoder instance to set.
394 * \param type See above.
396 * \code decoder != NULL \endcode
399 * \c false if the decoder is already initialized, else \c true.
401 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore(FLAC__FileDecoder *decoder, FLAC__MetadataType type);
403 /** This is inherited from FLAC__SeekableStreamDecoder; see
404 * FLAC__seekable_stream_decoder_set_metadata_ignore_application().
406 * \default By default, only the \c STREAMINFO block is returned via the
408 * \param decoder A decoder instance to set.
409 * \param id See above.
411 * \code decoder != NULL \endcode
412 * \code id != NULL \endcode
414 * \c false if the decoder is already initialized, else \c true.
416 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4]);
418 /** This is inherited from FLAC__SeekableStreamDecoder; see
419 * FLAC__seekable_stream_decoder_set_metadata_ignore_all().
421 * \default By default, only the \c STREAMINFO block is returned via the
423 * \param decoder A decoder instance to set.
425 * \code decoder != NULL \endcode
427 * \c false if the decoder is already initialized, else \c true.
429 FLAC_API FLAC__bool FLAC__file_decoder_set_metadata_ignore_all(FLAC__FileDecoder *decoder);
431 /** Get the current decoder state.
433 * \param decoder A decoder instance to query.
435 * \code decoder != NULL \endcode
436 * \retval FLAC__FileDecoderState
437 * The current decoder state.
439 FLAC_API FLAC__FileDecoderState FLAC__file_decoder_get_state(const FLAC__FileDecoder *decoder);
441 /** Get the state of the underlying seekable stream decoder.
442 * Useful when the file decoder state is
443 * \c FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR.
445 * \param decoder A decoder instance to query.
447 * \code decoder != NULL \endcode
448 * \retval FLAC__SeekableStreamDecoderState
449 * The seekable stream decoder state.
451 FLAC_API FLAC__SeekableStreamDecoderState FLAC__file_decoder_get_seekable_stream_decoder_state(const FLAC__FileDecoder *decoder);
453 /** Get the state of the underlying stream decoder.
454 * Useful when the file decoder state is
455 * \c FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR and the seekable stream
456 * decoder state is \c FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR.
458 * \param decoder A decoder instance to query.
460 * \code decoder != NULL \endcode
461 * \retval FLAC__StreamDecoderState
462 * The seekable stream decoder state.
464 FLAC_API FLAC__StreamDecoderState FLAC__file_decoder_get_stream_decoder_state(const FLAC__FileDecoder *decoder);
466 /** Get the current decoder state as a C string.
467 * This version automatically resolves
468 * \c FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR by getting the
469 * seekable stream decoder's state.
471 * \param decoder A decoder instance to query.
473 * \code decoder != NULL \endcode
474 * \retval const char *
475 * The decoder state as a C string. Do not modify the contents.
477 FLAC_API const char *FLAC__file_decoder_get_resolved_state_string(const FLAC__FileDecoder *decoder);
479 /** Get the "MD5 signature checking" flag.
480 * This is inherited from FLAC__SeekableStreamDecoder; see
481 * FLAC__seekable_stream_decoder_get_md5_checking().
483 * \param decoder A decoder instance to query.
485 * \code decoder != NULL \endcode
489 FLAC_API FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *decoder);
491 /** This is inherited from FLAC__SeekableStreamDecoder; see
492 * FLAC__seekable_stream_decoder_get_channels().
494 * \param decoder A decoder instance to query.
496 * \code decoder != NULL \endcode
500 FLAC_API unsigned FLAC__file_decoder_get_channels(const FLAC__FileDecoder *decoder);
502 /** This is inherited from FLAC__SeekableStreamDecoder; see
503 * FLAC__seekable_stream_decoder_get_channel_assignment().
505 * \param decoder A decoder instance to query.
507 * \code decoder != NULL \endcode
508 * \retval FLAC__ChannelAssignment
511 FLAC_API FLAC__ChannelAssignment FLAC__file_decoder_get_channel_assignment(const FLAC__FileDecoder *decoder);
513 /** This is inherited from FLAC__SeekableStreamDecoder; see
514 * FLAC__seekable_stream_decoder_get_bits_per_sample().
516 * \param decoder A decoder instance to query.
518 * \code decoder != NULL \endcode
522 FLAC_API unsigned FLAC__file_decoder_get_bits_per_sample(const FLAC__FileDecoder *decoder);
524 /** This is inherited from FLAC__SeekableStreamDecoder; see
525 * FLAC__seekable_stream_decoder_get_sample_rate().
527 * \param decoder A decoder instance to query.
529 * \code decoder != NULL \endcode
533 FLAC_API unsigned FLAC__file_decoder_get_sample_rate(const FLAC__FileDecoder *decoder);
535 /** This is inherited from FLAC__SeekableStreamDecoder; see
536 * FLAC__seekable_stream_decoder_get_blocksize().
538 * \param decoder A decoder instance to query.
540 * \code decoder != NULL \endcode
544 FLAC_API unsigned FLAC__file_decoder_get_blocksize(const FLAC__FileDecoder *decoder);
546 /** This is inherited from FLAC__SeekableStreamDecoder; see
547 * FLAC__seekable_stream_decoder_get_decode_position().
549 * \param decoder A decoder instance to query.
550 * \param position Address at which to return the desired position.
552 * \code decoder != NULL \endcode
553 * \code position != NULL \endcode
555 * \c true if successful, \c false if there was an error from
556 * the 'tell' callback.
558 FLAC_API FLAC__bool FLAC__file_decoder_get_decode_position(const FLAC__FileDecoder *decoder, FLAC__uint64 *position);
560 /** Initialize the decoder instance.
561 * Should be called after FLAC__file_decoder_new() and
562 * FLAC__file_decoder_set_*() but before any of the
563 * FLAC__file_decoder_process_*() functions. Will set and return
564 * the decoder state, which will be FLAC__FILE_DECODER_OK if
565 * initialization succeeded.
567 * \param decoder An uninitialized decoder instance.
569 * \code decoder != NULL \endcode
570 * \retval FLAC__FileDecoderState
571 * \c FLAC__FILE_DECODER_OK if initialization was successful; see
572 * FLAC__FileDecoderState for the meanings of other return values.
574 FLAC_API FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder);
576 /** Finish the decoding process.
577 * Flushes the decoding buffer, releases resources, resets the decoder
578 * settings to their defaults, and returns the decoder state to
579 * FLAC__FILE_DECODER_UNINITIALIZED.
581 * In the event of a prematurely-terminated decode, it is not strictly
582 * necessary to call this immediately before FLAC__file_decoder_delete()
583 * but it is good practice to match every FLAC__file_decoder_init() with
584 * a FLAC__file_decoder_finish().
586 * \param decoder An uninitialized decoder instance.
588 * \code decoder != NULL \endcode
590 * \c false if MD5 checking is on AND a STREAMINFO block was available
591 * AND the MD5 signature in the STREAMINFO block was non-zero AND the
592 * signature does not match the one computed by the decoder; else
595 FLAC_API FLAC__bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder);
597 /** This is inherited from FLAC__SeekableStreamDecoder; see
598 * FLAC__seekable_stream_decoder_process_single().
600 * \param decoder A decoder instance.
602 * \code decoder != NULL \endcode
606 FLAC_API FLAC__bool FLAC__file_decoder_process_single(FLAC__FileDecoder *decoder);
608 /** This is inherited from FLAC__SeekableStreamDecoder; see
609 * FLAC__seekable_stream_decoder_process_until_end_of_metadata().
611 * \param decoder A decoder instance.
613 * \code decoder != NULL \endcode
617 FLAC_API FLAC__bool FLAC__file_decoder_process_until_end_of_metadata(FLAC__FileDecoder *decoder);
619 /** This is inherited from FLAC__SeekableStreamDecoder; see
620 * FLAC__seekable_stream_decoder_process_until_end_of_stream().
622 * \param decoder A decoder instance.
624 * \code decoder != NULL \endcode
628 FLAC_API FLAC__bool FLAC__file_decoder_process_until_end_of_file(FLAC__FileDecoder *decoder);
630 /** Flush the input and seek to an absolute sample.
631 * This is inherited from FLAC__SeekableStreamDecoder; see
632 * FLAC__seekable_stream_decoder_seek_absolute().
634 * \param decoder A decoder instance.
635 * \param sample The target sample number to seek to.
637 * \code decoder != NULL \endcode
639 * \c true if successful, else \c false.
641 FLAC_API FLAC__bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, FLAC__uint64 sample);