1 /* libOggFLAC - Free Lossless Audio Codec + Ogg library
2 * Copyright (C) 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 OggFLAC__STREAM_DECODER_H
21 #define OggFLAC__STREAM_DECODER_H
23 #include "FLAC/stream_decoder.h"
30 /** \file include/OggFLAC/stream_decoder.h
33 * This module contains the functions which implement the stream
36 * See the detailed documentation in the
37 * \link oggflac_stream_decoder stream decoder \endlink module.
40 /** \defgroup oggflac_decoder OggFLAC/ *_decoder.h: decoder interfaces
44 * This module describes the decoder layers provided by libOggFLAC.
46 * libOggFLAC currently provides the same stream layer access as libFLAC;
47 * the interface is identical. See the \link flac_decoder FLAC
48 * decoder module \endlink for full documentation.
51 /** \defgroup oggflac_stream_decoder OggFLAC/stream_decoder.h: stream decoder interface
52 * \ingroup oggflac_decoder
55 * This module contains the functions which implement the stream
58 * The interface here is identical to FLAC's stream decoder,
59 * including the callbacks. See the \link flac_stream_decoder
60 * FLAC stream decoder module \endlink for full documentation.
66 /** State values for an OggFLAC__StreamDecoder
68 * The decoder's state can be obtained by calling OggFLAC__stream_decoder_get_state().
72 OggFLAC__STREAM_DECODER_OK = 0,
73 /**< The decoder is in the normal OK state. */
75 OggFLAC__STREAM_DECODER_OGG_ERROR,
76 /**< An error occurred in the underlying Ogg layer. */
78 OggFLAC__STREAM_DECODER_READ_ERROR,
79 /**< The read callback returned an error. */
81 OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR,
82 /**< An error occurred in the underlying FLAC stream decoder;
83 * check OggFLAC__stream_decoder_get_FLAC_stream_decoder_state().
86 OggFLAC__STREAM_DECODER_INVALID_CALLBACK,
87 /**< The decoder was initialized before setting all the required callbacks. */
89 OggFLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR,
90 /**< Memory allocation failed. */
92 OggFLAC__STREAM_DECODER_ALREADY_INITIALIZED,
93 /**< OggFLAC__stream_decoder_init() was called when the decoder was
94 * already initialized, usually because
95 * OggFLAC__stream_decoder_finish() was not called.
98 OggFLAC__STREAM_DECODER_UNINITIALIZED
99 /**< The decoder is in the uninitialized state. */
101 } OggFLAC__StreamDecoderState;
103 /** Maps an OggFLAC__StreamDecoderState to a C string.
105 * Using an OggFLAC__StreamDecoderState as the index to this array
106 * will give the string equivalent. The contents should not be modified.
108 extern const char * const OggFLAC__StreamDecoderStateString[];
111 /***********************************************************************
113 * class OggFLAC__StreamDecoder
115 ***********************************************************************/
117 struct OggFLAC__StreamDecoderProtected;
118 struct OggFLAC__StreamDecoderPrivate;
119 /** The opaque structure definition for the stream decoder type.
120 * See the \link oggflac_stream_decoder stream decoder module \endlink
121 * for a detailed description.
124 struct OggFLAC__StreamDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
125 struct OggFLAC__StreamDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
126 } OggFLAC__StreamDecoder;
128 /** Signature for the read callback.
129 * See OggFLAC__stream_decoder_set_read_callback()
130 * and FLAC__StreamDecoderReadCallback for more info.
132 * \param decoder The decoder instance calling the callback.
133 * \param buffer A pointer to a location for the callee to store
134 * data to be decoded.
135 * \param bytes A pointer to the size of the buffer.
136 * \param client_data The callee's client data set through
137 * OggFLAC__stream_decoder_set_client_data().
138 * \retval FLAC__StreamDecoderReadStatus
139 * The callee's return status.
141 typedef FLAC__StreamDecoderReadStatus (*OggFLAC__StreamDecoderReadCallback)(const OggFLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
143 /** Signature for the write callback.
144 * See OggFLAC__stream_decoder_set_write_callback()
145 * and FLAC__StreamDecoderWriteCallback for more info.
147 * \param decoder The decoder instance calling the callback.
148 * \param frame The description of the decoded frame.
149 * \param buffer An array of pointers to decoded channels of data.
150 * \param client_data The callee's client data set through
151 * OggFLAC__stream_decoder_set_client_data().
152 * \retval FLAC__StreamDecoderWriteStatus
153 * The callee's return status.
155 typedef FLAC__StreamDecoderWriteStatus (*OggFLAC__StreamDecoderWriteCallback)(const OggFLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
157 /** Signature for the metadata callback.
158 * See OggFLAC__stream_decoder_set_metadata_callback()
159 * and FLAC__StreamDecoderMetadataCallback for more info.
161 * \param decoder The decoder instance calling the callback.
162 * \param metadata The decoded metadata block.
163 * \param client_data The callee's client data set through
164 * OggFLAC__stream_decoder_set_client_data().
166 typedef void (*OggFLAC__StreamDecoderMetadataCallback)(const OggFLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
168 /** Signature for the error callback.
169 * See OggFLAC__stream_decoder_set_error_callback()
170 * and FLAC__StreamDecoderErrorCallback for more info.
172 * \param decoder The decoder instance calling the callback.
173 * \param status The error encountered by the decoder.
174 * \param client_data The callee's client data set through
175 * OggFLAC__stream_decoder_set_client_data().
177 typedef void (*OggFLAC__StreamDecoderErrorCallback)(const OggFLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
180 /***********************************************************************
182 * Class constructor/destructor
184 ***********************************************************************/
186 /** Create a new stream decoder instance. The instance is created with
187 * default settings; see the individual OggFLAC__stream_decoder_set_*()
188 * functions for each setting's default.
190 * \retval OggFLAC__StreamDecoder*
191 * \c NULL if there was an error allocating memory, else the new instance.
193 OggFLAC__StreamDecoder *OggFLAC__stream_decoder_new();
195 /** Free a decoder instance. Deletes the object pointed to by \a decoder.
197 * \param decoder A pointer to an existing decoder.
199 * \code decoder != NULL \endcode
201 void OggFLAC__stream_decoder_delete(OggFLAC__StreamDecoder *decoder);
204 /***********************************************************************
206 * Public class method prototypes
208 ***********************************************************************/
210 /** Set the read callback.
211 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_read_callback()
214 * The callback is mandatory and must be set before initialization.
217 * \param decoder A decoder instance to set.
218 * \param value See above.
220 * \code decoder != NULL \endcode
221 * \code value != NULL \endcode
223 * \c false if the decoder is already initialized, else \c true.
225 FLAC__bool OggFLAC__stream_decoder_set_read_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderReadCallback value);
227 /** Set the write callback.
228 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_write_callback()
231 * The callback is mandatory and must be set before initialization.
234 * \param decoder A decoder instance to set.
235 * \param value See above.
237 * \code decoder != NULL \endcode
238 * \code value != NULL \endcode
240 * \c false if the decoder is already initialized, else \c true.
242 FLAC__bool OggFLAC__stream_decoder_set_write_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderWriteCallback value);
244 /** Set the metadata callback.
245 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_callback()
248 * The callback is mandatory and must be set before initialization.
251 * \param decoder A decoder instance to set.
252 * \param value See above.
254 * \code decoder != NULL \endcode
255 * \code value != NULL \endcode
257 * \c false if the decoder is already initialized, else \c true.
259 FLAC__bool OggFLAC__stream_decoder_set_metadata_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderMetadataCallback value);
261 /** Set the error callback.
262 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_error_callback()
265 * The callback is mandatory and must be set before initialization.
268 * \param decoder A decoder instance to set.
269 * \param value See above.
271 * \code decoder != NULL \endcode
272 * \code value != NULL \endcode
274 * \c false if the decoder is already initialized, else \c true.
276 FLAC__bool OggFLAC__stream_decoder_set_error_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderErrorCallback value);
278 /** Set the client data to be passed back to callbacks.
279 * This value will be supplied to callbacks in their \a client_data
283 * \param decoder A decoder instance to set.
284 * \param value See above.
286 * \code decoder != NULL \endcode
288 * \c false if the decoder is already initialized, else \c true.
290 FLAC__bool OggFLAC__stream_decoder_set_client_data(OggFLAC__StreamDecoder *decoder, void *value);
292 /** Set the serial number for the Ogg stream.
293 * The default behavior is to use the serial number of the first Ogg
294 * page. Setting a serial number here will explicitly define which
295 * stream is to be decoded.
297 * \default \c use serial number of first page
298 * \param decoder A decoder instance to set.
299 * \param serial_number See above.
301 * \code decoder != NULL \endcode
303 * \c false if the decoder is already initialized, else \c true.
305 FLAC__bool OggFLAC__stream_decoder_set_serial_number(OggFLAC__StreamDecoder *decoder, long serial_number);
307 /** Direct the decoder to pass on all metadata blocks of type \a type.
308 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_respond()
310 * \default By default, only the \c STREAMINFO block is returned via the
312 * \param decoder A decoder instance to set.
313 * \param type See above.
315 * \code decoder != NULL \endcode
318 * \c false if the decoder is already initialized, else \c true.
320 FLAC__bool OggFLAC__stream_decoder_set_metadata_respond(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type);
322 /** Direct the decoder to pass on all APPLICATION metadata blocks of the
324 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_respond_application()
326 * \default By default, only the \c STREAMINFO block is returned via the
328 * \param decoder A decoder instance to set.
329 * \param id See above.
331 * \code decoder != NULL \endcode
332 * \code id != NULL \endcode
334 * \c false if the decoder is already initialized, else \c true.
336 FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
338 /** Direct the decoder to pass on all metadata blocks of any type.
339 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_respond_all()
341 * \default By default, only the \c STREAMINFO block is returned via the
343 * \param decoder A decoder instance to set.
345 * \code decoder != NULL \endcode
347 * \c false if the decoder is already initialized, else \c true.
349 FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_all(OggFLAC__StreamDecoder *decoder);
351 /** Direct the decoder to filter out all metadata blocks of type \a type.
352 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_ignore()
354 * \default By default, only the \c STREAMINFO block is returned via the
356 * \param decoder A decoder instance to set.
357 * \param type See above.
359 * \code decoder != NULL \endcode
362 * \c false if the decoder is already initialized, else \c true.
364 FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type);
366 /** Direct the decoder to filter out all APPLICATION metadata blocks of
368 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_ignore_application()
370 * \default By default, only the \c STREAMINFO block is returned via the
372 * \param decoder A decoder instance to set.
373 * \param id See above.
375 * \code decoder != NULL \endcode
376 * \code id != NULL \endcode
378 * \c false if the decoder is already initialized, else \c true.
380 FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
382 /** Direct the decoder to filter out all metadata blocks of any type.
383 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_ignore_all()
385 * \default By default, only the \c STREAMINFO block is returned via the
387 * \param decoder A decoder instance to set.
389 * \code decoder != NULL \endcode
391 * \c false if the decoder is already initialized, else \c true.
393 FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_all(OggFLAC__StreamDecoder *decoder);
395 /** Get the current decoder state.
397 * \param decoder A decoder instance to query.
399 * \code decoder != NULL \endcode
400 * \retval OggFLAC__StreamDecoderState
401 * The current decoder state.
403 OggFLAC__StreamDecoderState OggFLAC__stream_decoder_get_state(const OggFLAC__StreamDecoder *decoder);
405 /** Get the state of the underlying FLAC stream decoder.
406 * Useful when the stream decoder state is
407 * \c OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR.
409 * \param decoder A decoder instance to query.
411 * \code decoder != NULL \endcode
412 * \retval FLAC__StreamDecoderState
413 * The FLAC stream decoder state.
415 FLAC__StreamDecoderState OggFLAC__stream_decoder_get_FLAC_stream_decoder_state(const OggFLAC__StreamDecoder *decoder);
417 /** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_channels()
419 * \param decoder A decoder instance to query.
421 * \code decoder != NULL \endcode
425 unsigned OggFLAC__stream_decoder_get_channels(const OggFLAC__StreamDecoder *decoder);
427 /** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_channel_assignment()
429 * \param decoder A decoder instance to query.
431 * \code decoder != NULL \endcode
432 * \retval OggFLAC__ChannelAssignment
435 FLAC__ChannelAssignment OggFLAC__stream_decoder_get_channel_assignment(const OggFLAC__StreamDecoder *decoder);
437 /** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_bits_per_sample()
439 * \param decoder A decoder instance to query.
441 * \code decoder != NULL \endcode
445 unsigned OggFLAC__stream_decoder_get_bits_per_sample(const OggFLAC__StreamDecoder *decoder);
447 /** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_sample_rate()
449 * \param decoder A decoder instance to query.
451 * \code decoder != NULL \endcode
455 unsigned OggFLAC__stream_decoder_get_sample_rate(const OggFLAC__StreamDecoder *decoder);
457 /** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_blocksize()
459 * \param decoder A decoder instance to query.
461 * \code decoder != NULL \endcode
465 unsigned OggFLAC__stream_decoder_get_blocksize(const OggFLAC__StreamDecoder *decoder);
467 /** Initialize the decoder instance.
468 * Should be called after OggFLAC__stream_decoder_new() and
469 * OggFLAC__stream_decoder_set_*() but before any of the
470 * OggFLAC__stream_decoder_process_*() functions. Will set and return the
471 * decoder state, which will be OggFLAC__STREAM_DECODER_OK
472 * if initialization succeeded.
474 * \param decoder An uninitialized decoder instance.
476 * \code decoder != NULL \endcode
477 * \retval OggFLAC__StreamDecoderState
478 * \c OggFLAC__STREAM_DECODER_OK if initialization was
479 * successful; see OggFLAC__StreamDecoderState for the meanings of other
482 OggFLAC__StreamDecoderState OggFLAC__stream_decoder_init(OggFLAC__StreamDecoder *decoder);
484 /** Finish the decoding process.
485 * Flushes the decoding buffer, releases resources, resets the decoder
486 * settings to their defaults, and returns the decoder state to
487 * OggFLAC__STREAM_DECODER_UNINITIALIZED.
489 * In the event of a prematurely-terminated decode, it is not strictly
490 * necessary to call this immediately before OggFLAC__stream_decoder_delete()
491 * but it is good practice to match every OggFLAC__stream_decoder_init()
492 * with an OggFLAC__stream_decoder_finish().
494 * \param decoder An uninitialized decoder instance.
496 * \code decoder != NULL \endcode
498 void OggFLAC__stream_decoder_finish(OggFLAC__StreamDecoder *decoder);
500 /** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_flush()
502 * \param decoder A decoder instance.
504 * \code decoder != NULL \endcode
506 * \c true if successful, else \c false if a memory allocation
509 FLAC__bool OggFLAC__stream_decoder_flush(OggFLAC__StreamDecoder *decoder);
511 /** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_reset()
513 * \param decoder A decoder instance.
515 * \code decoder != NULL \endcode
517 * \c true if successful, else \c false if a memory allocation
520 FLAC__bool OggFLAC__stream_decoder_reset(OggFLAC__StreamDecoder *decoder);
522 /** Decode one metadata block or audio frame.
523 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_process_single()
525 * \param decoder An initialized decoder instance in the state
526 * \c OggFLAC__STREAM_DECODER_OK.
528 * \code decoder != NULL \endcode
529 * \code OggFLAC__stream_decoder_get_state(decoder) == OggFLAC__STREAM_DECODER_OK \endcode
531 * \c false if any read or write error occurred (except
532 * \c FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
533 * in any case, check the decoder state with
534 * OggFLAC__stream_decoder_get_state() to see what went wrong or to
535 * check for lost synchronization (a sign of stream corruption).
537 FLAC__bool OggFLAC__stream_decoder_process_single(OggFLAC__StreamDecoder *decoder);
539 /** Decode until the end of the metadata.
540 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_process_until_end_of_metadata()
542 * \param decoder An initialized decoder instance in the state
543 * \c OggFLAC__STREAM_DECODER_OK.
545 * \code decoder != NULL \endcode
546 * \code OggFLAC__stream_decoder_get_state(decoder) == OggFLAC__STREAM_DECODER_OK \endcode
548 * \c false if any read or write error occurred (except
549 * \c OggFLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
550 * in any case, check the decoder state with
551 * OggFLAC__stream_decoder_get_state() to see what went wrong or to
552 * check for lost synchronization (a sign of stream corruption).
554 FLAC__bool OggFLAC__stream_decoder_process_until_end_of_metadata(OggFLAC__StreamDecoder *decoder);
556 /** Decode until the end of the stream.
557 * This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_process_until_end_of_stream()
559 * \param decoder An initialized decoder instance in the state
560 * \c OggFLAC__STREAM_DECODER_OK.
562 * \code decoder != NULL \endcode
563 * \code OggFLAC__stream_decoder_get_state(decoder) == OggFLAC__STREAM_DECODER_OK \endcode
565 * \c false if any read or write error occurred (except
566 * \c OggFLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
567 * in any case, check the decoder state with
568 * OggFLAC__stream_decoder_get_state() to see what went wrong or to
569 * check for lost synchronization (a sign of stream corruption).
571 FLAC__bool OggFLAC__stream_decoder_process_until_end_of_stream(OggFLAC__StreamDecoder *decoder);