290 lines
15 KiB
C
290 lines
15 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__SEEKABLE_STREAM_DECODER_H
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#define FLAC__SEEKABLE_STREAM_DECODER_H
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#include "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/seekable_stream_decoder.h
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*
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* \brief
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* This module contains the functions which implement the seekable stream
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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_seekable_stream_decoder seekable stream decoder \endlink module.
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*/
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/** \defgroup flac_seekable_stream_decoder FLAC/seekable_stream_decoder.h: seekable stream 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 seekable stream
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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__seekable_stream_decoder_new().
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* - The program overrides the default settings and sets callbacks for
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* reading, writing, seeking, error reporting, and metadata reporting
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* using FLAC__seekable_stream_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__seekable_stream_decoder_init().
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* - The program calls the FLAC__seekable_stream_decoder_process_*()
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* functions to decode data, which subsequently calls the callbacks.
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* - The program finishes the decoding with
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* FLAC__seekable_stream_decoder_finish(), which flushes the input and
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* output and resets the decoder to the uninitialized state.
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* - The instance may be used again or deleted with
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* FLAC__seekable_stream_decoder_delete().
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*
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* The seekable stream decoder is a wrapper around the
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* \link flac_stream_decoder stream decoder \endlink which also provides
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* seeking capability. In addition to the Read/Write/Metadata/Error
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* callbacks of the stream decoder, the user must also provide the following:
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*
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* - Seek callback - This function will be called when the decoder wants to
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* seek to an absolute position in the stream.
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* - Tell callback - This function will be called when the decoder wants to
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* know the current absolute position of the stream.
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* - Length callback - This function will be called when the decoder wants
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* to know length of the stream. The seeking algorithm currently requires
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* that the overall stream length be known.
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* - EOF callback - This function will be called when the decoder wants to
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* know if it is at the end of the stream. This could be synthesized from
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* the tell and length callbacks but it may be more expensive that way, so
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* there is a separate callback for it.
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*
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* Seeking is exposed through the
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* FLAC__seekable_stream_decoder_seek_absolute() method. At any point after
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* the seekable stream decoder has been initialized, the user can call this
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* function to seek to an exact sample within the stream. Subsequently, the
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* first time the write callback is called it will be passed a (possibly
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* partial) block starting at that sample.
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*
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* The seekable stream decoder also provides MD5 signature checking. If
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* this is turned on before initialization,
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* FLAC__seekable_stream_decoder_finish() will report when the decoded MD5
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* signature does not match the one stored in the STREAMINFO block. MD5
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* checking is automatically turned off (until the next
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* FLAC__seekable_stream_decoder_reset()) if there is no signature in the
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* STREAMINFO block or when a seek is attempted.
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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__SEEKABLE_STREAM_DECODER_UNINITIALIZED, i.e. after
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* FLAC__seekable_stream_decoder_new() or
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* FLAC__seekable_stream_decoder_finish(), but before
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* FLAC__seekable_stream_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__stream_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__SeekableStreamDecoder
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*
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* The decoder's state can be obtained by calling FLAC__seekable_tream_decoder_get_state().
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*/
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typedef enum {
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FLAC__SEEKABLE_STREAM_DECODER_OK = 0,
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FLAC__SEEKABLE_STREAM_DECODER_SEEKING,
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FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM,
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FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR,
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FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR,
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FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR,
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FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR,
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FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED,
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FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK,
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FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED
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} FLAC__SeekableStreamDecoderState;
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extern const char * const FLAC__SeekableStreamDecoderStateString[];
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typedef enum {
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FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK,
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FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR
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} FLAC__SeekableStreamDecoderReadStatus;
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extern const char * const FLAC__SeekableStreamDecoderReadStatusString[];
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typedef enum {
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FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK,
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FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR
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} FLAC__SeekableStreamDecoderSeekStatus;
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extern const char * const FLAC__SeekableStreamDecoderSeekStatusString[];
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typedef enum {
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FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK,
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FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR
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} FLAC__SeekableStreamDecoderTellStatus;
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extern const char * const FLAC__SeekableStreamDecoderTellStatusString[];
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typedef enum {
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FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK,
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FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR
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} FLAC__SeekableStreamDecoderLengthStatus;
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extern const char * const FLAC__SeekableStreamDecoderLengthStatusString[];
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/***********************************************************************
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*
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* class FLAC__SeekableStreamDecoder : public FLAC__StreamDecoder
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*
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***********************************************************************/
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struct FLAC__SeekableStreamDecoderProtected;
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struct FLAC__SeekableStreamDecoderPrivate;
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typedef struct {
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struct FLAC__SeekableStreamDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
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struct FLAC__SeekableStreamDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
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} FLAC__SeekableStreamDecoder;
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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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/*
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* Any parameters that are not set before FLAC__seekable_stream_decoder_init()
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* will take on the defaults from the constructor, shown below.
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* For more on what the parameters mean, see the documentation.
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*
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* FLAC__bool md5_checking (DEFAULT: false) MD5 checking will be turned off if a seek is requested
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* (*read_callback)() (DEFAULT: NULL ) The callbacks are the only values that MUST be set before FLAC__seekable_stream_decoder_init()
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* (*seek_callback)() (DEFAULT: NULL )
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* (*tell_callback)() (DEFAULT: NULL )
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* (*length_callback)() (DEFAULT: NULL )
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* (*eof_callback)() (DEFAULT: NULL )
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* (*write_callback)() (DEFAULT: NULL )
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* (*metadata_callback)() (DEFAULT: NULL )
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* (*error_callback)() (DEFAULT: NULL )
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* void* client_data (DEFAULT: NULL ) passed back through the callbacks
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* metadata_respond/ignore By default, only the STREAMINFO block is returned via metadata_callback()
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*/
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FLAC__SeekableStreamDecoder *FLAC__seekable_stream_decoder_new();
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void FLAC__seekable_stream_decoder_delete(FLAC__SeekableStreamDecoder *);
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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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/*
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* Various "set" methods. These may only be called when the decoder
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* is in the state FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED, i.e. after
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* FLAC__seekable_stream_decoder_new() or FLAC__seekable_stream_decoder_finish(),
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* but before FLAC__seekable_stream_decoder_init(). If this is the case they
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* will return true, otherwise false.
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*
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* NOTE that these functions do not validate the values as many are
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* interdependent. The FLAC__seekable_stream_decoder_init() function will
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* do this, so make sure to pay attention to the state returned by
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* FLAC__seekable_stream_decoder_init().
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*
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* Any parameters that are not set before FLAC__seekable_stream_decoder_init()
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* will take on the defaults from the constructor. NOTE that
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* FLAC__seekable_stream_decoder_flush() or FLAC__seekable_stream_decoder_reset()
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* do NOT reset the values to the constructor defaults.
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*/
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FLAC__bool FLAC__seekable_stream_decoder_set_md5_checking(FLAC__SeekableStreamDecoder *decoder, FLAC__bool value);
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FLAC__bool FLAC__seekable_stream_decoder_set_read_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderReadStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_seek_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderSeekStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_tell_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderTellStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_length_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__SeekableStreamDecoderLengthStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_eof_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__bool (*value)(const FLAC__SeekableStreamDecoder *decoder, void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_write_callback(FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderWriteStatus (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_metadata_callback(FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_error_callback(FLAC__SeekableStreamDecoder *decoder, void (*value)(const FLAC__SeekableStreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data));
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FLAC__bool FLAC__seekable_stream_decoder_set_client_data(FLAC__SeekableStreamDecoder *decoder, void *value);
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/*
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* See the comments for the equivalent functions in stream_decoder.h
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*/
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FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond(FLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type);
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FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_application(FLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4]);
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FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_all(FLAC__SeekableStreamDecoder *decoder);
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FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore(FLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type);
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FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_application(FLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4]);
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FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_all(FLAC__SeekableStreamDecoder *decoder);
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/*
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* Various "get" methods
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*/
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FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_get_state(const FLAC__SeekableStreamDecoder *decoder);
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FLAC__bool FLAC__seekable_stream_decoder_get_md5_checking(const FLAC__SeekableStreamDecoder *decoder);
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/*
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* Methods to return the current number of channels, channel assignment
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* bits-per-sample, sample rate in Hz, and blocksize in samples. These
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* will only be valid after decoding has started.
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*/
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unsigned FLAC__seekable_stream_decoder_get_channels(const FLAC__SeekableStreamDecoder *decoder);
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FLAC__ChannelAssignment FLAC__seekable_stream_decoder_get_channel_assignment(const FLAC__SeekableStreamDecoder *decoder);
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unsigned FLAC__seekable_stream_decoder_get_bits_per_sample(const FLAC__SeekableStreamDecoder *decoder);
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unsigned FLAC__seekable_stream_decoder_get_sample_rate(const FLAC__SeekableStreamDecoder *decoder);
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unsigned FLAC__seekable_stream_decoder_get_blocksize(const FLAC__SeekableStreamDecoder *decoder);
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/*
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* Initialize the instance; should be called after construction and
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* 'set' calls but before any of the 'process' or 'seek' calls. Will
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* set and return the decoder state, which will be
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* FLAC__SEEKABLE_STREAM_DECODER_OK if initialization succeeded.
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*/
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FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__SeekableStreamDecoder *decoder);
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/*
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* Flush the decoding buffer, release resources, and return the decoder
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* state to FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED. Only returns false if
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* md5_checking is set AND the stored MD5 sum is non-zero AND the stored
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* MD5 sum and computed MD5 sum do not match.
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*/
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FLAC__bool FLAC__seekable_stream_decoder_finish(FLAC__SeekableStreamDecoder *decoder);
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/*
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* state control methods
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*/
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FLAC__bool FLAC__seekable_stream_decoder_flush(FLAC__SeekableStreamDecoder *decoder);
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FLAC__bool FLAC__seekable_stream_decoder_reset(FLAC__SeekableStreamDecoder *decoder);
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/*
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* Methods for decoding the data
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*/
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FLAC__bool FLAC__seekable_stream_decoder_process_whole_stream(FLAC__SeekableStreamDecoder *decoder);
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FLAC__bool FLAC__seekable_stream_decoder_process_metadata(FLAC__SeekableStreamDecoder *decoder);
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FLAC__bool FLAC__seekable_stream_decoder_process_one_frame(FLAC__SeekableStreamDecoder *decoder);
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FLAC__bool FLAC__seekable_stream_decoder_process_remaining_frames(FLAC__SeekableStreamDecoder *decoder);
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FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample);
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/* \} */
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#ifdef __cplusplus
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}
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#endif
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#endif
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