/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2000-2009 Josh Coalson
* Copyright (C) 2011-2025 Xiph.Org Foundation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Xiph.org Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FLAC__STREAM_DECODER_H
#define FLAC__STREAM_DECODER_H
#include <stdio.h> /* for FILE */
#include "export.h"
#include "format.h"
#ifdef __cplusplus
extern "C" {
#endif
/** \file include/FLAC/stream_decoder.h
*
* \brief
* This module contains the functions which implement the stream
* decoder.
*
* See the detailed documentation in the
* \link flac_stream_decoder stream decoder \endlink module.
*/
/** \defgroup flac_decoder FLAC/ \*_decoder.h: decoder interfaces
* \ingroup flac
*
* \brief
* This module describes the decoder layers provided by libFLAC.
*
* The stream decoder can be used to decode complete streams either from
* the client via callbacks, or directly from a file, depending on how
* it is initialized. When decoding via callbacks, the client provides
* callbacks for reading FLAC data and writing decoded samples, and
* handling metadata and errors. If the client also supplies seek-related
* callback, the decoder function for sample-accurate seeking within the
* FLAC input is also available. When decoding from a file, the client
* needs only supply a filename or open \c FILE* and write/metadata/error
* callbacks; the rest of the callbacks are supplied internally. For more
* info see the \link flac_stream_decoder stream decoder \endlink module.
*/
/** \defgroup flac_stream_decoder FLAC/stream_decoder.h: stream decoder interface
* \ingroup flac_decoder
*
* \brief
* This module contains the functions which implement the stream
* decoder.
*
* The stream decoder can decode native FLAC, and optionally Ogg FLAC
* (check FLAC_API_SUPPORTS_OGG_FLAC) streams and files.
*
* The basic usage of this decoder is as follows:
* - The program creates an instance of a decoder using
* FLAC__stream_decoder_new().
* - The program overrides the default settings using
* FLAC__stream_decoder_set_*() functions.
* - The program initializes the instance to validate the settings and
* prepare for decoding using
* - FLAC__stream_decoder_init_stream() or FLAC__stream_decoder_init_FILE()
* or FLAC__stream_decoder_init_file() for native FLAC,
* - FLAC__stream_decoder_init_ogg_stream() or FLAC__stream_decoder_init_ogg_FILE()
* or FLAC__stream_decoder_init_ogg_file() for Ogg FLAC
* - The program calls the FLAC__stream_decoder_process_*() functions
* to decode data, which subsequently calls the callbacks.
* - The program finishes the decoding with FLAC__stream_decoder_finish(),
* which flushes the input and output and resets the decoder to the
* uninitialized state.
* - The instance may be used again or deleted with
* FLAC__stream_decoder_delete().
*
* In more detail, the program will create a new instance by calling
* FLAC__stream_decoder_new(), then call FLAC__stream_decoder_set_*()
* functions to override the default decoder options, and call
* one of the FLAC__stream_decoder_init_*() functions.
*
* There are three initialization functions for native FLAC, one for
* setting up the decoder to decode FLAC data from the client via
* callbacks, and two for decoding directly from a FLAC file.
*
* For decoding via callbacks, use FLAC__stream_decoder_init_stream().
* You must also supply several callbacks for handling I/O. Some (like
* seeking) are optional, depending on the capabilities of the input.
*
* For decoding directly from a file, use FLAC__stream_decoder_init_FILE()
* or FLAC__stream_decoder_init_file(). Then you must only supply an open
* \c FILE* or filename and fewer callbacks; the decoder will handle
* the other callbacks internally.
*
* There are three similarly-named init functions for decoding from Ogg
* FLAC streams. Check \c FLAC_API_SUPPORTS_OGG_FLAC to find out if the
* library has been built with Ogg support.
*
* Once the decoder is initialized, your program will call one of several
* functions to start the decoding process:
*
* - FLAC__stream_decoder_process_single() - Tells the decoder to process at
* most one metadata block or audio frame and return, calling either the
* metadata callback or write callback, respectively, once. If the decoder
* loses sync it will return with only the error callback being called.
* - FLAC__stream_decoder_process_until_end_of_metadata() - Tells the decoder
* to process the stream from the current location and stop upon reaching
* the first audio frame. The client will get one metadata, write, or error
* callback per metadata block, audio frame, or sync error, respectively.
* - FLAC__stream_decoder_process_until_end_of_stream() - Tells the decoder
* to process the stream from the current location until the read callback
* returns FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM or
* FLAC__STREAM_DECODER_READ_STATUS_ABORT. The client will get one metadata,
* write, or error callback per metadata block, audio frame, or sync error,
* respectively.
*
* When the decoder has finished decoding (normally or through an abort),
* the instance is finished by calling FLAC__stream_decoder_finish(), which
* ensures the decoder is in the correct state and frees memory. Then the
* instance may be deleted with FLAC__stream_decoder_delete() or initialized
* again to decode another stream.
*
* Seeking is exposed through the FLAC__stream_decoder_seek_absolute() method.
* At any point after the stream decoder has been initialized, the client can
* call this function to seek to an exact sample within the stream.
* Subsequently, the first time the write callback is called it will be
* passed a (possibly partial) block starting at that sample.
*
* If the client cannot seek via the callback interface provided, but still
* has another way of seeking, it can flush the decoder using
* FLAC__stream_decoder_flush() and start feeding data from the new position
* through the read callback.
*
* The stream decoder also provides MD5 signature checking. If this is
* turned on before initialization, FLAC__stream_decoder_finish() will
* report when the decoded MD5 signature does not match the one stored
* in the STREAMINFO block. MD5 checking is automatically turned off
* (until the next FLAC__stream_decoder_reset()) if there is no signature
* in the STREAMINFO block or when a seek is attempted.
*
* The FLAC__stream_decoder_set_metadata_*() functions deserve special
* attention. By default, the decoder only calls the metadata_callback for
* the STREAMINFO block. These functions allow you to tell the decoder
* explicitly which blocks to parse and return via the metadata_callback
* and/or which to skip. Use a FLAC__stream_decoder_set_metadata_respond_all(),
* FLAC__stream_decoder_set_metadata_ignore() ... or FLAC__stream_decoder_set_metadata_ignore_all(),
* FLAC__stream_decoder_set_metadata_respond() ... sequence to exactly specify
* which blocks to return. Remember that metadata blocks can potentially
* be big (for example, cover art) so filtering out the ones you don't
* use can reduce the memory requirements of the decoder. Also note the
* special forms FLAC__stream_decoder_set_metadata_respond_application(id)
* and FLAC__stream_decoder_set_metadata_ignore_application(id) for
* filtering APPLICATION blocks based on the application ID.
*
* STREAMINFO and SEEKTABLE blocks are always parsed and used internally, but
* they still can legally be filtered from the metadata_callback.
*
* \note
* The "set" functions may only be called when the decoder is in the
* state FLAC__STREAM_DECODER_UNINITIALIZED, i.e. after
* FLAC__stream_decoder_new() or FLAC__stream_decoder_finish(), but
* before FLAC__stream_decoder_init_*(). If this is the case they will
* return \c true, otherwise \c false.
*
* \note
* FLAC__stream_decoder_finish() resets all settings to the constructor
* defaults, including the callbacks.
*
* \{
*/
/** State values for a FLAC__StreamDecoder
*
* The decoder's state can be obtained by calling FLAC__stream_decoder_get_state().
*/
typedef enum {
FLAC__STREAM_DECODER_SEARCH_FOR_METADATA = 0,
/**< The decoder is ready to search for metadata. */
FLAC__STREAM_DECODER_READ_METADATA,
/**< The decoder is ready to or is in the process of reading metadata. */
FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC,
/**< The decoder is ready to or is in the process of searching for the
* frame sync code.
*/
FLAC__STREAM_DECODER_READ_FRAME,
/**< The decoder is ready to or is in the process of reading a frame. */
FLAC__STREAM_DECODER_END_OF_STREAM,
/**< The decoder has reached the end of the stream. */
FLAC__STREAM_DECODER_OGG_ERROR,
/**< An error occurred in the underlying Ogg layer. */
FLAC__STREAM_DECODER_SEEK_ERROR,
/**< An error occurred while seeking. The decoder must be flushed
* with FLAC__stream_decoder_flush() or reset with
* FLAC__stream_decoder_reset() before decoding can continue.
*/
FLAC__STREAM_DECODER_ABORTED,
/**< The decoder was aborted by the read or write callback. */
FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR,
/**< An error occurred allocating memory. The decoder is in an invalid
* state and can no longer be used.
*/
FLAC__STREAM_DECODER_UNINITIALIZED,
/**< The decoder is in the uninitialized state; one of the
* FLAC__stream_decoder_init_*() functions must be called before samples
* can be processed.
*/
FLAC__STREAM_DECODER_END_OF_LINK
/**< The decoder has reached the end of an Ogg FLAC chain link and a new
* link follows; FLAC__stream_decoder_finish_link() has to be called to
* progress. This state is only returned when decoding of chained
* streams is enabled with
* FLAC__stream_decoder_set_decode_chained_stream()
*/
} FLAC__StreamDecoderState;
/** Maps a FLAC__StreamDecoderState to a C string.
*
* Using a FLAC__StreamDecoderState as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderStateString[];
/** Possible return values for the FLAC__stream_decoder_init_*() functions.
*/
typedef enum {
FLAC__STREAM_DECODER_INIT_STATUS_OK = 0,
/**< Initialization was successful. */
FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER,
/**< The library was not compiled with support for the given container
* format.
*/
FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS,
/**< A required callback was not supplied. */
FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR,
/**< An error occurred allocating memory. */
FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE,
/**< fopen() failed in FLAC__stream_decoder_init_file() or
* FLAC__stream_decoder_init_ogg_file(). */
FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED
/**< FLAC__stream_decoder_init_*() was called when the decoder was
* already initialized, usually because
* FLAC__stream_decoder_finish() was not called.
*/
} FLAC__StreamDecoderInitStatus;
/** Maps a FLAC__StreamDecoderInitStatus to a C string.
*
* Using a FLAC__StreamDecoderInitStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderInitStatusString[];
/** Return values for the FLAC__StreamDecoder read callback.
*/
typedef enum {
FLAC__STREAM_DECODER_READ_STATUS_CONTINUE,
/**< The read was OK and decoding can continue. */
FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM,
/**< The read was attempted while at the end of the stream. Note that
* the client must only return this value when the read callback was
* called when already at the end of the stream. Otherwise, if the read
* itself moves to the end of the stream, the client should still return
* the data and \c FLAC__STREAM_DECODER_READ_STATUS_CONTINUE, and then on
* the next read callback it should return
* \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM with a byte count
* of \c 0.
*/
FLAC__STREAM_DECODER_READ_STATUS_ABORT,
/**< An unrecoverable error occurred. The decoder will return from the process call. */
FLAC__STREAM_DECODER_READ_STATUS_END_OF_LINK
/**< The read was attempted while at the end of the link. The semantics
* are the same as for FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM.
*/
} FLAC__StreamDecoderReadStatus;
/** Maps a FLAC__StreamDecoderReadStatus to a C string.
*
* Using a FLAC__StreamDecoderReadStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderReadStatusString[];
/** Return values for the FLAC__StreamDecoder seek callback.
*/
typedef enum {
FLAC__STREAM_DECODER_SEEK_STATUS_OK,
/**< The seek was OK and decoding can continue. */
FLAC__STREAM_DECODER_SEEK_STATUS_ERROR,
/**< An unrecoverable error occurred. The decoder will return from the process call. */
FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED
/**< Client does not support seeking. */
} FLAC__StreamDecoderSeekStatus;
/** Maps a FLAC__StreamDecoderSeekStatus to a C string.
*
* Using a FLAC__StreamDecoderSeekStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[];
/** Return values for the FLAC__StreamDecoder tell callback.
*/
typedef enum {
FLAC__STREAM_DECODER_TELL_STATUS_OK,
/**< The tell was OK and decoding can continue. */
FLAC__STREAM_DECODER_TELL_STATUS_ERROR,
/**< An unrecoverable error occurred. The decoder will return from the process call. */
FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED
/**< Client does not support telling the position. */
} FLAC__StreamDecoderTellStatus;
/** Maps a FLAC__StreamDecoderTellStatus to a C string.
*
* Using a FLAC__StreamDecoderTellStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderTellStatusString[];
/** Return values for the FLAC__StreamDecoder length callback.
*/
typedef enum {
FLAC__STREAM_DECODER_LENGTH_STATUS_OK,
/**< The length call was OK and decoding can continue. */
FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR,
/**< An unrecoverable error occurred. The decoder will return from the process call. */
FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED
/**< Client does not support reporting the length. */
} FLAC__StreamDecoderLengthStatus;
/** Maps a FLAC__StreamDecoderLengthStatus to a C string.
*
* Using a FLAC__StreamDecoderLengthStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[];
/** Return values for the FLAC__StreamDecoder write callback.
*/
typedef enum {
FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE,
/**< The write was OK and decoding can continue. */
FLAC__STREAM_DECODER_WRITE_STATUS_ABORT
/**< An unrecoverable error occurred. The decoder will return from the process call. */
} FLAC__StreamDecoderWriteStatus;
/** Maps a FLAC__StreamDecoderWriteStatus to a C string.
*
* Using a FLAC__StreamDecoderWriteStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[];
/** Possible values passed back to the FLAC__StreamDecoder error callback.
* \c FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC is the generic catch-
* all. The rest could be caused by bad sync (false synchronization on
* data that is not the start of a frame) or corrupted data. The error
* itself is the decoder's best guess at what happened assuming a correct
* sync. For example \c FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER
* could be caused by a correct sync on the start of a frame, but some
* data in the frame header was corrupted. Or it could be the result of
* syncing on a point the stream that looked like the starting of a frame
* but was not. \c FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM
* could be because the decoder encountered a valid frame made by a future
* version of the encoder which it cannot parse, or because of a false
* sync making it appear as though an encountered frame was generated by
* a future encoder. \c FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA is
* caused by finding data that doesn't fit a metadata block (too large
* or too small) or finding inconsistencies in the metadata, for example
* a PICTURE block with an image that exceeds the size of the metadata
* block.
*/
typedef enum {
FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC,
/**< An error in the stream caused the decoder to lose synchronization. */
FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER,
/**< The decoder encountered a corrupted frame header. */
FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH,
/**< The frame's data did not match the CRC in the footer. */
FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM,
/**< The decoder encountered reserved fields in use in the stream. */
FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA,
/**< The decoder encountered a corrupted metadata block. */
FLAC__STREAM_DECODER_ERROR_STATUS_OUT_OF_BOUNDS,
/**< The decoder encountered a otherwise valid frame in which
* the decoded samples exceeded the range offered by the stated
* bit depth. */
FLAC__STREAM_DECODER_ERROR_STATUS_MISSING_FRAME
/**< Two adjacent frames had frame numbers increasing by more than
* 1 or sample numbers increasing by more than the blocksize,
* indicating that one or more frame/frames was missing between
* them. The decoder will sent out one or more ´fake' constant
* subframes to fill up the gap. */
} FLAC__StreamDecoderErrorStatus;
/** Maps a FLAC__StreamDecoderErrorStatus to a C string.
*
* Using a FLAC__StreamDecoderErrorStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[];
/***********************************************************************
*
* class FLAC__StreamDecoder
*
***********************************************************************/
struct FLAC__StreamDecoderProtected;
struct FLAC__StreamDecoderPrivate;
/** The opaque structure definition for the stream decoder type.
* See the \link flac_stream_decoder stream decoder module \endlink
* for a detailed description.
*/
typedef struct {
struct FLAC__StreamDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
struct FLAC__StreamDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
} FLAC__StreamDecoder;
/** Signature for the read callback.
*
* A function pointer matching this signature must be passed to
* FLAC__stream_decoder_init*_stream(). The supplied function will be
* called when the decoder needs more input data. The address of the
* buffer to be filled is supplied, along with the number of bytes the
* buffer can hold. The callback may choose to supply less data and
* modify the byte count but must be careful not to overflow the buffer.
* The callback then returns a status code chosen from
* FLAC__StreamDecoderReadStatus.
*
* Here is an example of a read callback for stdio streams:
* \code
* FLAC__StreamDecoderReadStatus read_cb(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
* {
* FILE *file = ((MyClientData*)client_data)->file;
* if(*bytes > 0) {
* *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, file);
* if(ferror(file))
* return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
* else if(*bytes == 0)
* return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
* else
* return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
* }
* else
* return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
* }
* \endcode
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param buffer A pointer to a location for the callee to store
* data to be decoded.
* \param bytes A pointer to the size of the buffer. On entry
* to the callback, it contains the maximum number
* of bytes that may be stored in \a buffer. The
* callee must set it to the actual number of bytes
* stored (0 in case of error or end-of-stream) before
* returning.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
* \retval FLAC__StreamDecoderReadStatus
* The callee's return status. Note that the callback should return
* \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM if and only if
* zero bytes were read and there is no more data to be read.
*/
typedef FLAC__StreamDecoderReadStatus (*FLAC__StreamDecoderReadCallback)(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
/** Signature for the seek callback.
*
* A function pointer matching this signature may be passed to
* FLAC__stream_decoder_init*_stream(). The supplied function will be
* called when the decoder needs to seek the input stream. The decoder
* will pass the absolute byte offset to seek to, 0 meaning the
* beginning of the stream.
*
* Here is an example of a seek callback for stdio streams:
* \code
* FLAC__StreamDecoderSeekStatus seek_cb(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
* {
* FILE *file = ((MyClientData*)client_data)->file;
* if(file == stdin)
* return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
* else if(fseeko(file, (off_t)absolute_byte_offset, SEEK_SET) < 0)
* return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
* else
* return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
* }
* \endcode
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param absolute_byte_offset The offset from the beginning of the stream
* to seek to.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
* \retval FLAC__StreamDecoderSeekStatus
* The callee's return status.
*/
typedef FLAC__StreamDecoderSeekStatus (*FLAC__StreamDecoderSeekCallback)(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
/** Signature for the tell callback.
*
* A function pointer matching this signature may be passed to
* FLAC__stream_decoder_init*_stream(). The supplied function will be
* called when the decoder wants to know the current position of the
* stream. The callback should return the byte offset from the
* beginning of the stream.
*
* Here is an example of a tell callback for stdio streams:
* \code
* FLAC__StreamDecoderTellStatus tell_cb(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
* {
* FILE *file = ((MyClientData*)client_data)->file;
* off_t pos;
* if(file == stdin)
* return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
* else if((pos = ftello(file)) < 0)
* return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
* else {
* *absolute_byte_offset = (FLAC__uint64)pos;
* return FLAC__STREAM_DECODER_TELL_STATUS_OK;
* }
* }
* \endcode
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param absolute_byte_offset A pointer to storage for the current offset
* from the beginning of the stream.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
* \retval FLAC__StreamDecoderTellStatus
* The callee's return status.
*/
typedef FLAC__StreamDecoderTellStatus (*FLAC__StreamDecoderTellCallback)(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
/** Signature for the length callback.
*
* A function pointer matching this signature may be passed to
* FLAC__stream_decoder_init*_stream(). The supplied function will be
* called when the decoder wants to know the total length of the stream
* in bytes.
*
* Here is an example of a length callback for stdio streams:
* \code
* FLAC__StreamDecoderLengthStatus length_cb(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
* {
* FILE *file = ((MyClientData*)client_data)->file;
* struct stat filestats;
*
* if(file == stdin)
* return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
* else if(fstat(fileno(file), &filestats) != 0)
* return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
* else {
* *stream_length = (FLAC__uint64)filestats.st_size;
* return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
* }
* }
* \endcode
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param stream_length A pointer to storage for the length of the stream
* in bytes.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
* \retval FLAC__StreamDecoderLengthStatus
* The callee's return status.
*/
typedef FLAC__StreamDecoderLengthStatus (*FLAC__StreamDecoderLengthCallback)(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
/** Signature for the EOF callback.
*
* A function pointer matching this signature may be passed to
* FLAC__stream_decoder_init*_stream(). The supplied function will be
* called when the decoder needs to know if the end of the stream has
* been reached.
*
* Here is an example of a EOF callback for stdio streams:
* FLAC__bool eof_cb(const FLAC__StreamDecoder *decoder, void *client_data)
* \code
* {
* FILE *file = ((MyClientData*)client_data)->file;
* return feof(file)? true : false;
* }
* \endcode
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
* \retval FLAC__bool
* \c true if the currently at the end of the stream, else \c false.
*/
typedef FLAC__bool (*FLAC__StreamDecoderEofCallback)(const FLAC__StreamDecoder *decoder, void *client_data);
/** Signature for the write callback.
*
* A function pointer matching this signature must be passed to one of
* the FLAC__stream_decoder_init_*() functions.
* The supplied function will be called when the decoder has decoded a
* single audio frame. The decoder will pass the frame metadata as well
* as an array of pointers (one for each channel) pointing to the
* decoded audio.
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param frame The description of the decoded frame. See
* FLAC__Frame.
* \param buffer An array of pointers to decoded channels of data.
* Each pointer will point to an array of signed
* samples of length \a frame->header.blocksize.
* Channels will be ordered according to the FLAC
* specification; see the documentation for the
* <A HREF="https://xiph.org/flac/format.html#frame_header">frame header</A>.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
* \retval FLAC__StreamDecoderWriteStatus
* The callee's return status.
*/
typedef FLAC__StreamDecoderWriteStatus (*FLAC__StreamDecoderWriteCallback)(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
/** Signature for the metadata callback.
*
* A function pointer matching this signature must be passed to one of
* the FLAC__stream_decoder_init_*() functions.
* The supplied function will be called when the decoder has decoded a
* metadata block. In a valid FLAC file there will always be one
* \c STREAMINFO block, followed by zero or more other metadata blocks.
* These will be supplied by the decoder in the same order as they
* appear in the stream and always before the first audio frame (i.e.
* write callback). The metadata block that is passed in must not be
* modified, and it doesn't live beyond the callback, so you should make
* a copy of it with FLAC__metadata_object_clone() if you will need it
* elsewhere. Since metadata blocks can potentially be large, by
* default the decoder only calls the metadata callback for the
* \c STREAMINFO block; you can instruct the decoder to pass or filter
* other blocks with FLAC__stream_decoder_set_metadata_*() calls.
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param metadata The decoded metadata block.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
*/
typedef void (*FLAC__StreamDecoderMetadataCallback)(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
/** Signature for the error callback.
*
* A function pointer matching this signature must be passed to one of
* the FLAC__stream_decoder_init_*() functions.
* The supplied function will be called whenever an error occurs during
* decoding.
*
* \note In general, FLAC__StreamDecoder functions which change the
* state should not be called on the \a decoder while in the callback.
*
* \param decoder The decoder instance calling the callback.
* \param status The error encountered by the decoder.
* \param client_data The callee's client data set through
* FLAC__stream_decoder_init_*().
*/
typedef void (*FLAC__StreamDecoderErrorCallback)(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
/***********************************************************************
*
* Class constructor/destructor
*
***********************************************************************/
/** Create a new stream decoder instance. The instance is created with
* default settings; see the individual FLAC__stream_decoder_set_*()
* functions for each setting's default.
*
* \retval FLAC__StreamDecoder*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void);
/** Free a decoder instance. Deletes the object pointed to by \a decoder.
*
* \param decoder A pointer to an existing decoder.
* \assert
* \code decoder != NULL \endcode
*/
FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder);
/***********************************************************************
*
* Public class method prototypes
*
***********************************************************************/
/** Set the serial number for the FLAC stream within the Ogg container.
* The default behavior is to use the serial number of the first Ogg
* page. Setting a serial number here will explicitly specify which
* stream is to be decoded.
*
* \note
* This does not need to be set for native FLAC decoding.
*
* \default \c use serial number of first page
* \param decoder A decoder instance to set.
* \param serial_number See above.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long serial_number);
/** Set the "decode chained stream" flag. If set to \c false, the
* decoder will stop decoding when it encounters the end-of-stream
* of the first link in the chain. If set to \c true, decoding will
* continue: at the start of each link, FLAC__stream_decoder_get_state
* will return FLAC__STREAM_DECODER_SEARCH_FOR_METADATA.
*
* This function was made to decode chained Ogg streams, but it should
* be possible to chain regular FLAC files through the read callback
* by using FLAC__STREAM_DECODER_READ_STATUS_END_OF_LINK
* appropriately.
*
* Note that when this flag is set to true, the serial number set
* with FLAC__stream_decoder_set_ogg_serial_number is ignored.
*
* \note
* This function has no effect with native FLAC decoding.
*
* \default \c false
* \param decoder A decoder instance to set.
* \param allow Whether to allow chained streams.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_decode_chained_stream(FLAC__StreamDecoder* decoder, FLAC__bool value);
/** Set the "MD5 signature checking" flag. If \c true, the decoder will
* compute the MD5 signature of the unencoded audio data while decoding
* and compare it to the signature from the STREAMINFO block, if it
* exists, during FLAC__stream_decoder_finish().
*
* MD5 signature checking will be turned off (until the next
* FLAC__stream_decoder_reset()) if there is no signature in the
* STREAMINFO block or when a seek is attempted.
*
* Clients that do not use the MD5 check should leave this off to speed
* up decoding.
*
* \default \c false
* \param decoder A decoder instance to set.
* \param value Flag value (see above).
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value);
/** Direct the decoder to pass on all metadata blocks of type \a type.
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param type See above.
* \assert
* \code decoder != NULL \endcode
* \a type is valid
* \retval FLAC__bool
* \c false if type is invalid, else \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type);
/** Direct the decoder to pass on all APPLICATION metadata blocks of the
* given \a id.
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param id See above.
* \assert
* \code decoder != NULL \endcode
* \code id != NULL \endcode
* \retval FLAC__bool
* \c false when memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
/** Direct the decoder to pass on all metadata blocks of any type.
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c always \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder);
/** Direct the decoder to filter out all metadata blocks of type \a type.
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param type See above.
* \assert
* \code decoder != NULL \endcode
* \a type is valid
* \retval FLAC__bool
* \c false if type is invalid, else \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type);
/** Direct the decoder to filter out all APPLICATION metadata blocks of
* the given \a id.
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param id See above.
* \assert
* \code decoder != NULL \endcode
* \code id != NULL \endcode
* \retval FLAC__bool
* \c false if memory allocation fails, else \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
/** Direct the decoder to filter out all metadata blocks of any type.
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c always \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder);
/** Get the current decoder state.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__StreamDecoderState
* The current decoder state.
*/
FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder);
/** Get the current decoder state as a C string.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval const char *
* The decoder state as a C string. Do not modify the contents.
*/
FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder);
/** Get the "decode chained stream" flag as described in
* \code FLAC__stream_decoder_set_decode_chained_stream \endcode.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* See above.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_chained_stream(const FLAC__StreamDecoder* decoder);
/** Get the "MD5 signature checking" flag.
* This is the value of the setting, not whether or not the decoder is
* currently checking the MD5 (remember, it can be turned off automatically
* by a seek). When the decoder is reset the flag will be restored to the
* value returned by this function.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* See above.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder);
/** Get the total number of samples in the stream being decoded.
* Will only be valid after decoding has started and will contain the
* value from the \c STREAMINFO block. A value of \c 0 means "unknown".
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval uint32_t
* See above.
*/
FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder);
/** Seek to the end of the file being decoded to find the total number
* of samples. This will return a number of samples even if
* FLAC__stream_decoder_get_total_samples() returns 0. It can also
* be used to find the total number of samples of a chained stream,
* as it returns the total number of samples in all chain links
* combined. See FLAC__stream_decoder_set_decode_chained_stream()
*
* For this function to work, the stream must be seekable. Also, as
* seeking can fail, this function returns 0 when it was unable to
* find the total number of samples. Use
* FLAC__stream_decoder_get_state() in that case to find out whether
* the decoder is still valid.
*
* The state in which the decoder is left after calling this function
* is undefined and might change in the future. Use
* FLAC__stream_decoder_reset() to return the decoder to a defined
* state.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval uint32_t
* See above.
*/
FLAC_API FLAC__uint64 FLAC__stream_decoder_find_total_samples(FLAC__StreamDecoder *decoder);
/** Get the current number of channels in the stream being decoded.
* Will only be valid after decoding has started and will contain the
* value from the most recently decoded frame header.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval uint32_t
* See above.
*/
FLAC_API uint32_t FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder);
/** Get the current channel assignment in the stream being decoded.
* Will only be valid after decoding has started and will contain the
* value from the most recently decoded frame header.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__ChannelAssignment
* See above.
*/
FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder);
/** Get the current sample resolution in the stream being decoded.
* Will only be valid after decoding has started and will contain the
* value from the most recently decoded frame header.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval uint32_t
* See above.
*/
FLAC_API uint32_t FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder);
/** Get the current sample rate in Hz of the stream being decoded.
* Will only be valid after decoding has started and will contain the
* value from the most recently decoded frame header.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval uint32_t
* See above.
*/
FLAC_API uint32_t FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder);
/** Get the current blocksize of the stream being decoded.
* Will only be valid after decoding has started and will contain the
* value from the most recently decoded frame header.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval uint32_t
* See above.
*/
FLAC_API uint32_t FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder);
/** Returns the decoder's current read position within the stream.
* The position is the byte offset from the start of the stream.
* Bytes before this position have been fully decoded. Note that
* there may still be undecoded bytes in the decoder's read FIFO.
* The returned position is correct even after a seek.
*
* \warning This function currently only works for native FLAC,
* not Ogg FLAC streams.
*
* \param decoder A decoder instance to query.
* \param position Address at which to return the desired position.
* \assert
* \code decoder != NULL \endcode
* \code position != NULL \endcode
* \retval FLAC__bool
* \c true if successful, \c false if the stream is not native FLAC,
* or there was an error from the 'tell' callback or it returned
* \c FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position);
/** Return client_data from decoder.
* The data pointed to by the pointer should not be modified.
*
* \param decoder A decoder instance.
* \retval const void *
* The callee's client data set through FLAC__stream_decoder_init_*().
* Do not modify the contents.
*/
FLAC_API const void *FLAC__stream_decoder_get_client_data(FLAC__StreamDecoder *decoder);
#define FLAC__STREAM_DECODER_GET_LINK_LENGTHS_INVALID -1
#define FLAC__STREAM_DECODER_GET_LINK_LENGTHS_NOT_INDEXED -2
#define FLAC__STREAM_DECODER_GET_LINK_LENGTHS_MEMORY_ALLOCATION_ERROR -3
/** Get the link lengths in samples in a chained stream
*
* After either processing the whole file or using
* FLAC__stream_decoder_find_total_samples, this function
* returns an array with link lengths in samples. If it fails,
* it returns a negative number as error code, currently either
* FLAC__STREAM_DECODER_GET_LINK_LENGTHS_INVALID if the current
* decoder is not in a valid state or not processing a chained
* stream, FLAC__STREAM_DECODER_GET_LINK_LENGTHS_NOT_INDEXED if
* the stream hasn't been indexed yet, and
* FLAC__STREAM_DECODER_GET_LINK_LENGTHS_MEMORY_ALLOCATION_ERROR
* if allocating memory failed.
*
* If the function succeeds, the return value is the number of
* links. The link_lengths parameter is a FLAC__uint64 pointer
* which is allocated by the call, and must be freed by the user.
* If a null pointer is passed, the function only returns the
* number of links, not their lengths. The length of the returned
* array is equal to the number of links and thus to the return
* value of the function.
*
* \param decoder A decoder instance to query.
* \param link_lengths Address at which to return the link lengths
* array.
* \assert
* \code decoder != NULL \endcode
* \retval int32_t
* \c the number of links if successful, zero or a negative
* number if unsuccessful
*/
FLAC_API int32_t FLAC__stream_decoder_get_link_lengths(FLAC__StreamDecoder *decoder, FLAC__uint64 **link_lengths);
/** Initialize the decoder instance to decode native FLAC streams.
*
* This flavor of initialization sets up the decoder to decode from a
* native FLAC stream. I/O is performed via callbacks to the client.
* For decoding from a plain file via filename or open FILE*,
* FLAC__stream_decoder_init_file() and FLAC__stream_decoder_init_FILE()
* provide a simpler interface.
*
* This function should be called after FLAC__stream_decoder_new() and
* FLAC__stream_decoder_set_*() but before any of the
* FLAC__stream_decoder_process_*() functions. Will set and return the
* decoder state, which will be FLAC__STREAM_DECODER_SEARCH_FOR_METADATA
* if initialization succeeded.
*
* \param decoder An uninitialized decoder instance.
* \param read_callback See FLAC__StreamDecoderReadCallback. This
* pointer must not be \c NULL.
* \param seek_callback See FLAC__StreamDecoderSeekCallback. This
* pointer may be \c NULL if seeking is not
* supported. If \a seek_callback is not \c NULL then a
* \a tell_callback, \a length_callback, and \a eof_callback must also be supplied.
* Alternatively, a dummy seek callback that just
* returns \c FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param tell_callback See FLAC__StreamDecoderTellCallback. This
* pointer may be \c NULL if not supported by the client. If
* \a seek_callback is not \c NULL then a
* \a tell_callback must also be supplied.
* Alternatively, a dummy tell callback that just
* returns \c FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param length_callback See FLAC__StreamDecoderLengthCallback. This
* pointer may be \c NULL if not supported by the client. If
* \a seek_callback is not \c NULL then a
* \a length_callback must also be supplied.
* Alternatively, a dummy length callback that just
* returns \c FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param eof_callback See FLAC__StreamDecoderEofCallback. This
* pointer may be \c NULL if not supported by the client. If
* \a seek_callback is not \c NULL then a
* \a eof_callback must also be supplied.
* Alternatively, a dummy length callback that just
* returns \c false
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param write_callback See FLAC__StreamDecoderWriteCallback. This
* pointer must not be \c NULL.
* \param metadata_callback See FLAC__StreamDecoderMetadataCallback. This
* pointer may be \c NULL if the callback is not
* desired.
* \param error_callback See FLAC__StreamDecoderErrorCallback. This
* pointer must not be \c NULL.
* \param client_data This value will be supplied to callbacks in their
* \a client_data argument.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__StreamDecoderInitStatus
* \c FLAC__STREAM_DECODER_INIT_STATUS_OK if initialization was successful;
* see FLAC__StreamDecoderInitStatus for the meanings of other return values.
*/
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
FLAC__StreamDecoder *decoder,
FLAC__StreamDecoderReadCallback read_callback,
FLAC__StreamDecoderSeekCallback seek_callback,
FLAC__StreamDecoderTellCallback tell_callback,
FLAC__StreamDecoderLengthCallback length_callback,
FLAC__StreamDecoderEofCallback eof_callback,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
);
/** Initialize the decoder instance to decode Ogg FLAC streams.
*
* This flavor of initialization sets up the decoder to decode from a
* FLAC stream in an Ogg container. I/O is performed via callbacks to the
* client. For decoding from a plain file via filename or open FILE*,
* FLAC__stream_decoder_init_ogg_file() and FLAC__stream_decoder_init_ogg_FILE()
* provide a simpler interface.
*
* This function should be called after FLAC__stream_decoder_new() and
* FLAC__stream_decoder_set_*() but before any of the
* FLAC__stream_decoder_process_*() functions. Will set and return the
* decoder state, which will be FLAC__STREAM_DECODER_SEARCH_FOR_METADATA
* if initialization succeeded.
*
* \note Support for Ogg FLAC in the library is optional. If this
* library has been built without support for Ogg FLAC, this function
* will return \c FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER.
*
* \param decoder An uninitialized decoder instance.
* \param read_callback See FLAC__StreamDecoderReadCallback. This
* pointer must not be \c NULL.
* \param seek_callback See FLAC__StreamDecoderSeekCallback. This
* pointer may be \c NULL if seeking is not
* supported. If \a seek_callback is not \c NULL then a
* \a tell_callback, \a length_callback, and \a eof_callback must also be supplied.
* Alternatively, a dummy seek callback that just
* returns \c FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param tell_callback See FLAC__StreamDecoderTellCallback. This
* pointer may be \c NULL if not supported by the client. If
* \a seek_callback is not \c NULL then a
* \a tell_callback must also be supplied.
* Alternatively, a dummy tell callback that just
* returns \c FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param length_callback See FLAC__StreamDecoderLengthCallback. This
* pointer may be \c NULL if not supported by the client. If
* \a seek_callback is not \c NULL then a
* \a length_callback must also be supplied.
* Alternatively, a dummy length callback that just
* returns \c FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param eof_callback See FLAC__StreamDecoderEofCallback. This
* pointer may be \c NULL if not supported by the client. If
* \a seek_callback is not \c NULL then a
* \a eof_callback must also be supplied.
* Alternatively, a dummy length callback that just
* returns \c false
* may also be supplied, all though this is slightly
* less efficient for the decoder.
* \param write_callback See FLAC__StreamDecoderWriteCallback. This
* pointer must not be \c NULL.
* \param metadata_callback See FLAC__StreamDecoderMetadataCallback. This
* pointer may be \c NULL if the callback is not
* desired.
* \param error_callback See FLAC__StreamDecoderErrorCallback. This
* pointer must not be \c NULL.
* \param client_data This value will be supplied to callbacks in their
* \a client_data argument.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__StreamDecoderInitStatus
* \c FLAC__STREAM_DECODER_INIT_STATUS_OK if initialization was successful;
* see FLAC__StreamDecoderInitStatus for the meanings of other return values.
*/
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
FLAC__StreamDecoder *decoder,
FLAC__StreamDecoderReadCallback read_callback,
FLAC__StreamDecoderSeekCallback seek_callback,
FLAC__StreamDecoderTellCallback tell_callback,
FLAC__StreamDecoderLengthCallback length_callback,
FLAC__StreamDecoderEofCallback eof_callback,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
);
/** Initialize the decoder instance to decode native FLAC files.
*
* This flavor of initialization sets up the decoder to decode from a
* plain native FLAC file. For non-stdio streams, you must use
* FLAC__stream_decoder_init_stream() and provide callbacks for the I/O.
*
* This function should be called after FLAC__stream_decoder_new() and
* FLAC__stream_decoder_set_*() but before any of the
* FLAC__stream_decoder_process_*() functions. Will set and return the
* decoder state, which will be FLAC__STREAM_DECODER_SEARCH_FOR_METADATA
* if initialization succeeded.
*
* \param decoder An uninitialized decoder instance.
* \param file An open FLAC file. The file should have been
* opened with mode \c "rb" and rewound. The file
* becomes owned by the decoder and should not be
* manipulated by the client while decoding.
* Unless \a file is \c stdin, it will be closed
* when FLAC__stream_decoder_finish() is called.
* Note however that seeking will not work when
* decoding from \c stdin since it is not seekable.
* \param write_callback See FLAC__StreamDecoderWriteCallback. This
* pointer must not be \c NULL.
* \param metadata_callback See FLAC__StreamDecoderMetadataCallback. This
* pointer may be \c NULL if the callback is not
* desired.
* \param error_callback See FLAC__StreamDecoderErrorCallback. This
* pointer must not be \c NULL.
* \param client_data This value will be supplied to callbacks in their
* \a client_data argument.
* \assert
* \code decoder != NULL \endcode
* \code file != NULL \endcode
* \retval FLAC__StreamDecoderInitStatus
* \c FLAC__STREAM_DECODER_INIT_STATUS_OK if initialization was successful;
* see FLAC__StreamDecoderInitStatus for the meanings of other return values.
*/
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
FLAC__StreamDecoder *decoder,
FILE *file,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
);
/** Initialize the decoder instance to decode Ogg FLAC files.
*
* This flavor of initialization sets up the decoder to decode from a
* plain Ogg FLAC file. For non-stdio streams, you must use
* FLAC__stream_decoder_init_ogg_stream() and provide callbacks for the I/O.
*
* This function should be called after FLAC__stream_decoder_new() and
* FLAC__stream_decoder_set_*() but before any of the
* FLAC__stream_decoder_process_*() functions. Will set and return the
* decoder state, which will be FLAC__STREAM_DECODER_SEARCH_FOR_METADATA
* if initialization succeeded.
*
* \note Support for Ogg FLAC in the library is optional. If this
* library has been built without support for Ogg FLAC, this function
* will return \c FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER.
*
* \param decoder An uninitialized decoder instance.
* \param file An open FLAC file. The file should have been
* opened with mode \c "rb" and rewound. The file
* becomes owned by the decoder and should not be
* manipulated by the client while decoding.
* Unless \a file is \c stdin, it will be closed
* when FLAC__stream_decoder_finish() is called.
* Note however that seeking will not work when
* decoding from \c stdin since it is not seekable.
* \param write_callback See FLAC__StreamDecoderWriteCallback. This
* pointer must not be \c NULL.
* \param metadata_callback See FLAC__StreamDecoderMetadataCallback. This
* pointer may be \c NULL if the callback is not
* desired.
* \param error_callback See FLAC__StreamDecoderErrorCallback. This
* pointer must not be \c NULL.
* \param client_data This value will be supplied to callbacks in their
* \a client_data argument.
* \assert
* \code decoder != NULL \endcode
* \code file != NULL \endcode
* \retval FLAC__StreamDecoderInitStatus
* \c FLAC__STREAM_DECODER_INIT_STATUS_OK if initialization was successful;
* see FLAC__StreamDecoderInitStatus for the meanings of other return values.
*/
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
FLAC__StreamDecoder *decoder,
FILE *file,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
);
/** Initialize the decoder instance to decode native FLAC files.
*
* This flavor of initialization sets up the decoder to decode from a plain
* native FLAC file. If POSIX fopen() semantics are not sufficient, you must
* use FLAC__stream_decoder_init_FILE(), or FLAC__stream_decoder_init_stream()
* and provide callbacks for the I/O.
*
* On Windows, filename must be a UTF-8 encoded filename, which libFLAC
* internally translates to an appropriate representation to use with
* _wfopen. On all other systems, filename is passed to fopen without
* any translation.
*
* This function should be called after FLAC__stream_decoder_new() and
* FLAC__stream_decoder_set_*() but before any of the
* FLAC__stream_decoder_process_*() functions. Will set and return the
* decoder state, which will be FLAC__STREAM_DECODER_SEARCH_FOR_METADATA
* if initialization succeeded.
*
* \param decoder An uninitialized decoder instance.
* \param filename The name of the file to decode from. The file will
* be opened with fopen(). Use \c NULL to decode from
* \c stdin. Note that \c stdin is not seekable.
* \param write_callback See FLAC__StreamDecoderWriteCallback. This
* pointer must not be \c NULL.
* \param metadata_callback See FLAC__StreamDecoderMetadataCallback. This
* pointer may be \c NULL if the callback is not
* desired.
* \param error_callback See FLAC__StreamDecoderErrorCallback. This
* pointer must not be \c NULL.
* \param client_data This value will be supplied to callbacks in their
* \a client_data argument.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__StreamDecoderInitStatus
* \c FLAC__STREAM_DECODER_INIT_STATUS_OK if initialization was successful;
* see FLAC__StreamDecoderInitStatus for the meanings of other return values.
*/
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
FLAC__StreamDecoder *decoder,
const char *filename,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
);
/** Initialize the decoder instance to decode Ogg FLAC files.
*
* This flavor of initialization sets up the decoder to decode from a plain
* Ogg FLAC file. If POSIX fopen() semantics are not sufficient, you must use
* FLAC__stream_decoder_init_ogg_FILE(), or FLAC__stream_decoder_init_ogg_stream()
* and provide callbacks for the I/O.
*
* On Windows, filename must be a UTF-8 encoded filename, which libFLAC
* internally translates to an appropriate representation to use with
* _wfopen. On all other systems, filename is passed to fopen without
* any translation.
*
* This function should be called after FLAC__stream_decoder_new() and
* FLAC__stream_decoder_set_*() but before any of the
* FLAC__stream_decoder_process_*() functions. Will set and return the
* decoder state, which will be FLAC__STREAM_DECODER_SEARCH_FOR_METADATA
* if initialization succeeded.
*
* \note Support for Ogg FLAC in the library is optional. If this
* library has been built without support for Ogg FLAC, this function
* will return \c FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER.
*
* \param decoder An uninitialized decoder instance.
* \param filename The name of the file to decode from. The file will
* be opened with fopen(). Use \c NULL to decode from
* \c stdin. Note that \c stdin is not seekable.
* \param write_callback See FLAC__StreamDecoderWriteCallback. This
* pointer must not be \c NULL.
* \param metadata_callback See FLAC__StreamDecoderMetadataCallback. This
* pointer may be \c NULL if the callback is not
* desired.
* \param error_callback See FLAC__StreamDecoderErrorCallback. This
* pointer must not be \c NULL.
* \param client_data This value will be supplied to callbacks in their
* \a client_data argument.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__StreamDecoderInitStatus
* \c FLAC__STREAM_DECODER_INIT_STATUS_OK if initialization was successful;
* see FLAC__StreamDecoderInitStatus for the meanings of other return values.
*/
FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
FLAC__StreamDecoder *decoder,
const char *filename,
FLAC__StreamDecoderWriteCallback write_callback,
FLAC__StreamDecoderMetadataCallback metadata_callback,
FLAC__StreamDecoderErrorCallback error_callback,
void *client_data
);
/** Finish the decoding process.
* Flushes the decoding buffer, releases resources, resets the decoder
* settings to their defaults, and returns the decoder state to
* FLAC__STREAM_DECODER_UNINITIALIZED.
*
* In the event of a prematurely-terminated decode, it is not strictly
* necessary to call this immediately before FLAC__stream_decoder_delete()
* but it is good practice to match every FLAC__stream_decoder_init_*()
* with a FLAC__stream_decoder_finish().
*
* \param decoder An uninitialized decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if MD5 checking is on AND a STREAMINFO block was available
* AND the MD5 signature in the STREAMINFO block was non-zero AND the
* signature does not match the one computed by the decoder; else
* \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder);
/** Finish the decoding process of the current link.
* Checks MD5 for current link and start processing of the next link. This
* function should only be used when the decoder state is
* FLAC__STREAM_DECODER_END_OF_LINK. After calling this function, the state
* is set to FLAC__STREAM_DECODER_SEARCH_FOR_METADATA.
*
* \param decoder An uninitialized decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if MD5 checking is on AND a STREAMINFO block was available
* AND the MD5 signature in the STREAMINFO block was non-zero AND the
* signature does not match the one computed by the decoder; else
* \c true.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_finish_link(FLAC__StreamDecoder *decoder);
/** Flush the stream input.
* The decoder's input buffer will be cleared and the state set to
* \c FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC. This will also turn
* off MD5 checking.
*
* \param decoder A decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c true if successful, else \c false if a memory allocation
* error occurs (in which case the state will be set to
* \c FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR).
*/
FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder);
/** Reset the decoding process.
* The decoder's input buffer will be cleared and the state set to
* \c FLAC__STREAM_DECODER_SEARCH_FOR_METADATA. This is similar to
* FLAC__stream_decoder_finish() except that the settings are
* preserved; there is no need to call FLAC__stream_decoder_init_*()
* before decoding again. MD5 checking will be restored to its original
* setting.
*
* If the decoder is seekable, or was initialized with
* FLAC__stream_decoder_init*_FILE() or FLAC__stream_decoder_init*_file(),
* the decoder will also attempt to seek to the beginning of the file.
* If this rewind fails, this function will return \c false. It follows
* that FLAC__stream_decoder_reset() cannot be used when decoding from
* \c stdin.
*
* If the decoder was initialized with FLAC__stream_encoder_init*_stream()
* and is not seekable (i.e. no seek callback was provided or the seek
* callback returns \c FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED), it
* is the duty of the client to start feeding data from the beginning of
* the stream on the next FLAC__stream_decoder_process_*() call.
*
* \param decoder A decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c true if successful, else \c false if a memory allocation occurs
* (in which case the state will be set to
* \c FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR) or a seek error
* occurs (the state will be unchanged).
*/
FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder);
/** Decode one metadata block or audio frame.
* This version instructs the decoder to decode a either a single metadata
* block or a single frame and stop, unless the callbacks return a fatal
* error or the read callback returns
* \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM.
*
* As the decoder needs more input it will call the read callback.
* Depending on what was decoded, the metadata or write callback will be
* called with the decoded metadata block or audio frame.
*
* Unless there is a fatal read error or end of stream, this function
* will return once one whole frame is decoded. In other words, if the
* stream is not synchronized or points to a corrupt frame header, the
* decoder will continue to try and resync until it gets to a valid
* frame, then decode one frame, then return. If the decoder points to
* a frame whose frame CRC in the frame footer does not match the
* computed frame CRC, this function will issue a
* FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH error to the
* error callback, and return, having decoded one complete, although
* corrupt, frame. (Such corrupted frames are sent as silence of the
* correct length to the write callback.)
*
* \param decoder An initialized decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if any fatal read, write, or memory allocation error
* occurred (meaning decoding must stop), else \c true; for more
* information about the decoder, check the decoder state with
* FLAC__stream_decoder_get_state().
*/
FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder);
/** Decode until the end of the metadata.
* This version instructs the decoder to decode from the current position
* and continue until all the metadata has been read, or until the
* callbacks return a fatal error or the read callback returns
* \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM.
*
* As the decoder needs more input it will call the read callback.
* As each metadata block is decoded, the metadata callback will be called
* with the decoded metadata.
*
* \param decoder An initialized decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if any fatal read, write, or memory allocation error
* occurred (meaning decoding must stop), else \c true; for more
* information about the decoder, check the decoder state with
* FLAC__stream_decoder_get_state().
*/
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder);
/** Decode until the end of the Ogg chain link.
* This version instructs the decoder to decode from the current
* position and continue until the end of link or until the
* callbacks return a fatal error. This function should not be
* used without enabling decoding of chained streams with
* FLAC__stream_decoder_set_decode_chained_stream()
*
* To start processing the next link after calling this function,
* call FLAC__stream_decoder_finish_link()
*
* As the decoder needs more input it will call the read callback.
* As each metadata block and frame is decoded, the metadata or write
* callback will be called with the decoded metadata or frame.
*
* \param decoder An initialized decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if any fatal read, write, or memory allocation error
* occurred (meaning decoding must stop), else \c true; for more
* information about the decoder, check the decoder state with
* FLAC__stream_decoder_get_state().
*/
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_link(FLAC__StreamDecoder *decoder);
/** Decode until the end of the stream.
* This version instructs the decoder to decode from the current position
* and continue until the end of stream (the read callback returns
* \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM), or until the
* callbacks return a fatal error.
*
* As the decoder needs more input it will call the read callback.
* As each metadata block and frame is decoded, the metadata or write
* callback will be called with the decoded metadata or frame.
*
* \param decoder An initialized decoder instance.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if any fatal read, write, or memory allocation error
* occurred (meaning decoding must stop), else \c true; for more
* information about the decoder, check the decoder state with
* FLAC__stream_decoder_get_state().
*/
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder);
/** Skip one audio frame.
* This version instructs the decoder to 'skip' a single frame and stop,
* unless the callbacks return a fatal error or the read callback returns
* \c FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM.
*
* The decoding flow is the same as what occurs when
* FLAC__stream_decoder_process_single() is called to process an audio
* frame, except that this function does not decode the parsed data into
* PCM or call the write callback. The integrity of the frame is still
* checked the same way as in the other process functions.
*
* This function will return once one whole frame is skipped, in the
* same way that FLAC__stream_decoder_process_single() will return once
* one whole frame is decoded.
*
* This function can be used in more quickly determining FLAC frame
* boundaries when decoding of the actual data is not needed, for
* example when an application is separating a FLAC stream into frames
* for editing or storing in a container. To do this, the application
* can use FLAC__stream_decoder_skip_single_frame() to quickly advance
* to the next frame, then use
* FLAC__stream_decoder_get_decode_position() to find the new frame
* boundary.
*
* This function should only be called when the stream has advanced
* past all the metadata, otherwise it will return \c false.
*
* \param decoder An initialized decoder instance not in a metadata
* state.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if any fatal read, write, or memory allocation error
* occurred (meaning decoding must stop), or if the decoder
* is in the FLAC__STREAM_DECODER_SEARCH_FOR_METADATA or
* FLAC__STREAM_DECODER_READ_METADATA state, else \c true; for more
* information about the decoder, check the decoder state with
* FLAC__stream_decoder_get_state().
*/
FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder);
/** Skip one Ogg chain link.
* This version instructs the decoder to 'skip' the current ogg chain
* link. This function should not be used without enabling decoding
* of chained streams with
* FLAC__stream_decoder_set_decode_chained_stream()
*
* When the location ot the next link is already known (for example,
* because there has already been a seek in the stream) this function
* will seek to the end of the link and start processing, but when it
* is not, it will do various seeks (when possible) to find the end
* of the link. If seeking is not possible (or the tell and length
* callback do not work) it will simply read forward instead of
* seeking, much like a muted (but faster) version of
* FLAC__stream_decoder_process_until_end_of_link().
*
* \param decoder An initialized decoder instance not in a metadata
* state.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if any fatal read, write, or memory allocation error
* occurred (meaning decoding must stop), or when decoding a format
* that does not support chaining, else \c true; for more
* information about the decoder, check the decoder state with
* FLAC__stream_decoder_get_state().
*/
FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_link(FLAC__StreamDecoder *decoder);
/** Flush the input and seek to an absolute sample.
* Decoding will resume at the given sample. Note that because of
* this, the next write callback may contain a partial block. The
* client must support seeking the input or this function will fail
* and return \c false. Furthermore, if the decoder state is
* \c FLAC__STREAM_DECODER_SEEK_ERROR, then the decoder must be flushed
* with FLAC__stream_decoder_flush() or reset with
* FLAC__stream_decoder_reset() before decoding can continue.
*
* When seeking in a chained stream with decoding of such streams
* enabled with FLAC__stream_decoder_set_decode_chained_stream(),
* this function seeks in the whole stream, over all links. When
* a seek to another link is performed, the decoder will also
* return metadata blocks of that link. If this is not desired,
* use FLAC__stream_decoder_set_metadata_ignore_all() before
* seeking.
*
* \param decoder A decoder instance.
* \param sample The target sample number to seek to.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c true if successful, else \c false.
*/
FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample);
/* \} */
#ifdef __cplusplus
}
#endif
#endif