590 lines
21 KiB
C
590 lines
21 KiB
C
/* libFLAC - Free Lossless Audio Codec library
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* Copyright (C) 2000,2001,2002 Josh Coalson
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef FLAC__FILE_DECODER_H
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#define FLAC__FILE_DECODER_H
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#include "seekable_stream_decoder.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \file include/FLAC/file_decoder.h
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*
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* \brief
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* This module contains the functions which implement the file
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* decoder.
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*
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* See the detailed documentation in the
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* \link flac_file_decoder file decoder \endlink module.
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*/
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/** \defgroup flac_file_decoder FLAC/file_decoder.h: file decoder interface
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* \ingroup flac_decoder
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*
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* \brief
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* This module contains the functions which implement the file
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* decoder.
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*
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* The basic usage of this decoder is as follows:
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* - The program creates an instance of a decoder using
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* FLAC__file_decoder_new().
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* - The program overrides the default settings and sets callbacks for
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* writing, error reporting, and metadata reporting using
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* FLAC__file_decoder_set_*() functions.
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* - The program initializes the instance to validate the settings and
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* prepare for decoding using FLAC__file_decoder_init().
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* - The program calls the FLAC__file_decoder_process_*() functions
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* to decode data, which subsequently calls the callbacks.
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* - The program finishes the decoding with FLAC__file_decoder_finish(),
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* which flushes the input and output and resets the decoder to the
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* uninitialized state.
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* - The instance may be used again or deleted with
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* FLAC__file_decoder_delete().
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*
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* The file decoder is a trivial wrapper around the
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* \link flac_seekable_stream_decoder seekable stream decoder \endlink
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* meant to simplfy the process of decoding from a standard file. The
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* file decoder supplies all but the Write/Metadata/Error callbacks.
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* The user needs only to provide the path to the file and the file
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* decoder handles the rest.
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*
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* Like the seekable stream decoder, seeking is exposed through the
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* FLAC__file_decoder_seek_absolute() method. At any point after the file
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* decoder has been initialized, the user can call this function to seek to
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* an exact sample within the file. Subsequently, the first time the write
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* callback is called it will be passed a (possibly partial) block starting
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* at that sample.
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*
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* The file decoder also inherits MD5 signature checking from the seekable
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* stream decoder. If this is turned on before initialization,
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* FLAC__file_decoder_finish() will report when the decoded MD5 signature
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* does not match the one stored in the STREAMINFO block. MD5 checking is
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* automatically turned off if there is no signature in the STREAMINFO
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* block or when a seek is attempted.
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*
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* Make sure to read the detailed descriptions of the
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* \link flac_seekable_stream_decoder seekable stream decoder module \endlink
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* and \link flac_stream_decoder stream decoder module \endlink
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* since the file decoder inherits much of its behavior from them.
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*
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* \note
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* The "set" functions may only be called when the decoder is in the
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* state FLAC__FILE_DECODER_UNINITIALIZED, i.e. after
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* FLAC__file_decoder_new() or FLAC__file_decoder_finish(), but
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* before FLAC__file_decoder_init(). If this is the case they will
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* return \c true, otherwise \c false.
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*
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* \note
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* FLAC__file_decoder_finish() resets all settings to the constructor
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* defaults, including the callbacks.
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*
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* \{
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*/
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/** State values for a FLAC__FileDecoder
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*
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* The decoder's state can be obtained by calling FLAC__file_decoder_get_state().
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*/
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typedef enum {
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FLAC__FILE_DECODER_OK = 0,
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/**< The decoder is in the normal OK state. */
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FLAC__FILE_DECODER_END_OF_FILE,
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/**< The decoder has reached the end of the file. */
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FLAC__FILE_DECODER_ERROR_OPENING_FILE,
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/**< An error occurred opening the input file. */
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FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR,
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/**< An error occurred allocating memory. */
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FLAC__FILE_DECODER_SEEK_ERROR,
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/**< An error occurred while seeking. */
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FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR,
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/**< An error occurred in the underlying seekable stream decoder. */
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FLAC__FILE_DECODER_ALREADY_INITIALIZED,
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/**< FLAC__file_decoder_init() was called when the decoder was already
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* initialized, usually because FLAC__file_decoder_finish() was not
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* called.
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*/
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FLAC__FILE_DECODER_INVALID_CALLBACK,
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/**< FLAC__file_decoder_init() was called without all callbacks
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* being set.
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*/
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FLAC__FILE_DECODER_UNINITIALIZED
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/**< The decoder is in the uninitialized state. */
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} FLAC__FileDecoderState;
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/** Maps a FLAC__FileDecoderState to a C string.
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*
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* Using a FLAC__FileDecoderState as the index to this array
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* will give the string equivalent. The contents should not be modified.
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*/
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extern const char * const FLAC__FileDecoderStateString[];
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/***********************************************************************
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*
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* class FLAC__FileDecoder : public FLAC__StreamDecoder
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*
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***********************************************************************/
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struct FLAC__FileDecoderProtected;
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struct FLAC__FileDecoderPrivate;
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/** The opaque structure definition for the file decoder type. See the
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* \link flac_file_decoder file decoder module \endlink for a detailed
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* description.
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*/
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typedef struct {
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struct FLAC__FileDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
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struct FLAC__FileDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
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} FLAC__FileDecoder;
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/* @@@@ document */
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typedef FLAC__StreamDecoderWriteStatus (*FLAC__FileDecoderWriteCallback)(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
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typedef void (*FLAC__FileDecoderMetadataCallback)(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
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typedef void (*FLAC__FileDecoderErrorCallback)(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
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/***********************************************************************
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*
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* Class constructor/destructor
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*
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***********************************************************************/
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/** Create a new file decoder instance. The instance is created with
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* default settings; see the individual FLAC__file_decoder_set_*()
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* functions for each setting's default.
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*
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* \retval FLAC__FileDecoder*
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* \c NULL if there was an error allocating memory, else the new instance.
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*/
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FLAC__FileDecoder *FLAC__file_decoder_new();
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/** Free a decoder instance. Deletes the object pointed to by \a decoder.
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*
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* \param decoder A pointer to an existing decoder.
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* \assert
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* \code decoder != NULL \endcode
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*/
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void FLAC__file_decoder_delete(FLAC__FileDecoder *decoder);
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/***********************************************************************
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*
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* Public class method prototypes
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*
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***********************************************************************/
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/** Set the "MD5 signature checking" flag.
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* This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_md5_checking().
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*
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* \default \c false
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* \param decoder A decoder instance to set.
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* \param value See above.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_md5_checking(FLAC__FileDecoder *decoder, FLAC__bool value);
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/** Set the input file name to decode.
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*
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* \default \c "-"
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* \param decoder A decoder instance to set.
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* \param value The input file name, or "-" for \c stdin.
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* \assert
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* \code decoder != NULL \endcode
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* \code value != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, or there was a memory
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* allocation error, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_filename(FLAC__FileDecoder *decoder, const char *value);
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/** Set the write callback.
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* This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_write_callback().
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*
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* \note
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* The callback is mandatory and must be set before initialization.
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*
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* \default \c NULL
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* \param decoder A decoder instance to set.
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* \param value See above.
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* \assert
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* \code decoder != NULL \endcode
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* \code value != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_write_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderWriteCallback value);
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/** Set the metadata callback.
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* This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_metadata_callback().
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*
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* \note
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* The callback is mandatory and must be set before initialization.
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*
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* \default \c NULL
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* \param decoder A decoder instance to set.
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* \param value See above.
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* \assert
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* \code decoder != NULL \endcode
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* \code value != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_metadata_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderMetadataCallback value);
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/** Set the error callback.
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* This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_error_callback().
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*
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* \note
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* The callback is mandatory and must be set before initialization.
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*
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* \default \c NULL
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* \param decoder A decoder instance to set.
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* \param value See above.
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* \assert
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* \code decoder != NULL \endcode
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* \code value != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_error_callback(FLAC__FileDecoder *decoder, FLAC__FileDecoderErrorCallback value);
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/** Set the client data to be passed back to callbacks.
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* This value will be supplied to callbacks in their \a client_data
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* argument.
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*
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* \default \c NULL
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* \param decoder An decoder instance to set.
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* \param value See above.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_client_data(FLAC__FileDecoder *decoder, void *value);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_metadata_respond().
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*
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* \default By default, only the \c STREAMINFO block is returned via the
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* metadata callback.
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* \param decoder A decoder instance to set.
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* \param type See above.
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* \assert
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* \code decoder != NULL \endcode
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* \a type is valid
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_metadata_respond(FLAC__FileDecoder *decoder, FLAC__MetadataType type);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_metadata_respond_application().
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*
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* \default By default, only the \c STREAMINFO block is returned via the
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* metadata callback.
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* \param decoder A decoder instance to set.
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* \param id See above.
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* \assert
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* \code decoder != NULL \endcode
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* \code id != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_metadata_respond_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4]);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_metadata_respond_all().
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*
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* \default By default, only the \c STREAMINFO block is returned via the
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* metadata callback.
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* \param decoder A decoder instance to set.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_metadata_respond_all(FLAC__FileDecoder *decoder);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_metadata_ignore().
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*
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* \default By default, only the \c STREAMINFO block is returned via the
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* metadata callback.
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* \param decoder A decoder instance to set.
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* \param type See above.
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* \assert
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* \code decoder != NULL \endcode
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* \a type is valid
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_metadata_ignore(FLAC__FileDecoder *decoder, FLAC__MetadataType type);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_metadata_ignore_application().
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*
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* \default By default, only the \c STREAMINFO block is returned via the
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* metadata callback.
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* \param decoder A decoder instance to set.
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* \param id See above.
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* \assert
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* \code decoder != NULL \endcode
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* \code id != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_metadata_ignore_application(FLAC__FileDecoder *decoder, const FLAC__byte id[4]);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_set_metadata_ignore_all().
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*
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* \default By default, only the \c STREAMINFO block is returned via the
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* metadata callback.
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* \param decoder A decoder instance to set.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the decoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__file_decoder_set_metadata_ignore_all(FLAC__FileDecoder *decoder);
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/** Get the current decoder state.
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*
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* \param decoder A decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__FileDecoderState
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* The current decoder state.
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*/
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FLAC__FileDecoderState FLAC__file_decoder_get_state(const FLAC__FileDecoder *decoder);
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/** Get the state of the underlying seekable stream decoder.
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* Useful when the file decoder state is
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* \c FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR.
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*
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* \param decoder An decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__SeekableStreamDecoderState
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* The seekable stream decoder state.
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*/
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FLAC__SeekableStreamDecoderState FLAC__file_decoder_get_seekable_stream_decoder_state(const FLAC__FileDecoder *decoder);
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/** Get the state of the underlying stream decoder.
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* Useful when the file decoder state is
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* \c FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR and the seekable stream
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* decoder state is \c FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR.
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*
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* \param decoder An decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__SeekableStreamDecoderState
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* The seekable stream decoder state.
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*/
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FLAC__StreamDecoderState FLAC__file_decoder_get_stream_decoder_state(const FLAC__FileDecoder *decoder);
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/** Get the "MD5 signature checking" flag.
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* This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_get_md5_checking().
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*
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* \param decoder A decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__bool
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* See above.
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*/
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FLAC__bool FLAC__file_decoder_get_md5_checking(const FLAC__FileDecoder *decoder);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_get_channels().
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*
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* \param decoder A decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval unsigned
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* See above.
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*/
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unsigned FLAC__file_decoder_get_channels(const FLAC__FileDecoder *decoder);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_get_channel_assignment().
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*
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* \param decoder A decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__ChannelAssignment
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* See above.
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*/
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FLAC__ChannelAssignment FLAC__file_decoder_get_channel_assignment(const FLAC__FileDecoder *decoder);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_get_bits_per_sample().
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*
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* \param decoder A decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval unsigned
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* See above.
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*/
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unsigned FLAC__file_decoder_get_bits_per_sample(const FLAC__FileDecoder *decoder);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_get_sample_rate().
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*
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* \param decoder A decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval unsigned
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* See above.
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*/
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unsigned FLAC__file_decoder_get_sample_rate(const FLAC__FileDecoder *decoder);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
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* FLAC__seekable_stream_decoder_get_blocksize().
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*
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* \param decoder A decoder instance to query.
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* \assert
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* \code decoder != NULL \endcode
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* \retval unsigned
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* See above.
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*/
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unsigned FLAC__file_decoder_get_blocksize(const FLAC__FileDecoder *decoder);
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/** Initialize the decoder instance.
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* Should be called after FLAC__file_decoder_new() and
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* FLAC__file_decoder_set_*() but before any of the
|
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* FLAC__file_decoder_process_*() functions. Will set and return
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* the decoder state, which will be FLAC__FILE_DECODER_OK if
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* initialization succeeded.
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*
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* \param decoder An uninitialized decoder instance.
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* \assert
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* \code decoder != NULL \endcode
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* \retval FLAC__FileDecoderState
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* \c FLAC__FILE_DECODER_OK if initialization was successful; see
|
|
* FLAC__FileDecoderState for the meanings of other return values.
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*/
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FLAC__FileDecoderState FLAC__file_decoder_init(FLAC__FileDecoder *decoder);
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/** Finish the decoding process.
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* Flushes the decoding buffer, releases resources, resets the decoder
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* settings to their defaults, and returns the decoder state to
|
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* FLAC__FILE_DECODER_UNINITIALIZED.
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*
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|
* In the event of a prematurely-terminated decode, it is not strictly
|
|
* necessary to call this immediately before FLAC__file_decoder_delete()
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* but it is good practice to match every FLAC__file_decoder_init() with
|
|
* a FLAC__file_decoder_finish().
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*
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* \param decoder An uninitialized decoder instance.
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* \assert
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* \code decoder != NULL \endcode
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* \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
|
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* \c true.
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|
*/
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FLAC__bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder);
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/** This is inherited from FLAC__SeekableStreamDecoder; see
|
|
* FLAC__seekable_stream_decoder_process_single().
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|
*
|
|
* \param decoder A decoder instance.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \retval FLAC__bool
|
|
* See above.
|
|
*/
|
|
FLAC__bool FLAC__file_decoder_process_single(FLAC__FileDecoder *decoder);
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|
|
|
/** This is inherited from FLAC__SeekableStreamDecoder; see
|
|
* FLAC__seekable_stream_decoder_process_until_end_of_metadata().
|
|
*
|
|
* \param decoder A decoder instance.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \retval FLAC__bool
|
|
* See above.
|
|
*/
|
|
FLAC__bool FLAC__file_decoder_process_until_end_of_metadata(FLAC__FileDecoder *decoder);
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|
|
|
/** This is inherited from FLAC__SeekableStreamDecoder; see
|
|
* FLAC__seekable_stream_decoder_process_until_end_of_stream().
|
|
*
|
|
* \param decoder A decoder instance.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \retval FLAC__bool
|
|
* See above.
|
|
*/
|
|
FLAC__bool FLAC__file_decoder_process_until_end_of_file(FLAC__FileDecoder *decoder);
|
|
|
|
/** This is inherited from FLAC__SeekableStreamDecoder; see
|
|
* FLAC__seekable_stream_decoder_process_remaining_frames().
|
|
*
|
|
* \param decoder A decoder instance.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \retval FLAC__bool
|
|
* See above.
|
|
*/
|
|
FLAC__bool FLAC__file_decoder_process_remaining_frames(FLAC__FileDecoder *decoder);
|
|
|
|
/** Flush the input and seek to an absolute sample.
|
|
* This is inherited from FLAC__SeekableStreamDecoder; see
|
|
* FLAC__seekable_stream_decoder_seek_absolute().
|
|
*
|
|
* \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__bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, FLAC__uint64 sample);
|
|
|
|
/* \} */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|