582 lines
22 KiB
C
582 lines
22 KiB
C
/* libOggFLAC - Free Lossless Audio Codec + Ogg library
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* Copyright (C) 2002,2003 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 OggFLAC__STREAM_DECODER_H
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#define OggFLAC__STREAM_DECODER_H
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#include "export.h"
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#include "FLAC/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/OggFLAC/stream_decoder.h
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*
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* \brief
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* This module contains the functions which implement the 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 oggflac_stream_decoder stream decoder \endlink module.
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*/
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/** \defgroup oggflac_decoder OggFLAC/ *_decoder.h: decoder interfaces
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* \ingroup oggflac
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*
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* \brief
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* This module describes the decoder layers provided by libOggFLAC.
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*
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* libOggFLAC currently provides the same stream layer access as libFLAC;
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* the interface is identical. See the \link flac_decoder FLAC
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* decoder module \endlink for full documentation.
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*/
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/** \defgroup oggflac_stream_decoder OggFLAC/stream_decoder.h: stream decoder interface
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* \ingroup oggflac_decoder
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*
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* \brief
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* This module contains the functions which implement the stream
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* decoder.
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*
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* The interface here is identical to FLAC's stream decoder,
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* including the callbacks. See the \link flac_stream_decoder
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* FLAC stream decoder module \endlink for full documentation.
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*
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* \{
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*/
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/** State values for an OggFLAC__StreamDecoder
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*
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* The decoder's state can be obtained by calling OggFLAC__stream_decoder_get_state().
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*/
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typedef enum {
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OggFLAC__STREAM_DECODER_OK = 0,
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/**< The decoder is in the normal OK state. */
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OggFLAC__STREAM_DECODER_OGG_ERROR,
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/**< An error occurred in the underlying Ogg layer. */
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OggFLAC__STREAM_DECODER_READ_ERROR,
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/**< The read callback returned an error. */
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OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR,
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/**< An error occurred in the underlying FLAC stream decoder;
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* check OggFLAC__stream_decoder_get_FLAC_stream_decoder_state().
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*/
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OggFLAC__STREAM_DECODER_INVALID_CALLBACK,
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/**< The decoder was initialized before setting all the required callbacks. */
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OggFLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR,
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/**< Memory allocation failed. */
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OggFLAC__STREAM_DECODER_ALREADY_INITIALIZED,
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/**< OggFLAC__stream_decoder_init() was called when the decoder was
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* already initialized, usually because
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* OggFLAC__stream_decoder_finish() was not called.
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*/
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OggFLAC__STREAM_DECODER_UNINITIALIZED
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/**< The decoder is in the uninitialized state. */
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} OggFLAC__StreamDecoderState;
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/** Maps an OggFLAC__StreamDecoderState to a C string.
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*
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* Using an OggFLAC__StreamDecoderState 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 OggFLAC_API const char * const OggFLAC__StreamDecoderStateString[];
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/***********************************************************************
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*
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* class OggFLAC__StreamDecoder
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*
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***********************************************************************/
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struct OggFLAC__StreamDecoderProtected;
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struct OggFLAC__StreamDecoderPrivate;
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/** The opaque structure definition for the stream decoder type.
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* See the \link oggflac_stream_decoder stream decoder module \endlink
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* for a detailed description.
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*/
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typedef struct {
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struct OggFLAC__StreamDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
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struct OggFLAC__StreamDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
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} OggFLAC__StreamDecoder;
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/** Signature for the read callback.
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* See OggFLAC__stream_decoder_set_read_callback()
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* and FLAC__StreamDecoderReadCallback for more info.
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*
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* \param decoder The decoder instance calling the callback.
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* \param buffer A pointer to a location for the callee to store
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* data to be decoded.
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* \param bytes A pointer to the size of the buffer.
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* \param client_data The callee's client data set through
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* OggFLAC__stream_decoder_set_client_data().
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* \retval FLAC__StreamDecoderReadStatus
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* The callee's return status.
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*/
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typedef FLAC__StreamDecoderReadStatus (*OggFLAC__StreamDecoderReadCallback)(const OggFLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
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/** Signature for the write callback.
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* See OggFLAC__stream_decoder_set_write_callback()
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* and FLAC__StreamDecoderWriteCallback for more info.
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*
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* \param decoder The decoder instance calling the callback.
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* \param frame The description of the decoded frame.
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* \param buffer An array of pointers to decoded channels of data.
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* \param client_data The callee's client data set through
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* OggFLAC__stream_decoder_set_client_data().
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* \retval FLAC__StreamDecoderWriteStatus
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* The callee's return status.
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*/
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typedef FLAC__StreamDecoderWriteStatus (*OggFLAC__StreamDecoderWriteCallback)(const OggFLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
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/** Signature for the metadata callback.
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* See OggFLAC__stream_decoder_set_metadata_callback()
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* and FLAC__StreamDecoderMetadataCallback for more info.
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*
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* \param decoder The decoder instance calling the callback.
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* \param metadata The decoded metadata block.
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* \param client_data The callee's client data set through
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* OggFLAC__stream_decoder_set_client_data().
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*/
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typedef void (*OggFLAC__StreamDecoderMetadataCallback)(const OggFLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
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/** Signature for the error callback.
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* See OggFLAC__stream_decoder_set_error_callback()
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* and FLAC__StreamDecoderErrorCallback for more info.
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*
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* \param decoder The decoder instance calling the callback.
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* \param status The error encountered by the decoder.
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* \param client_data The callee's client data set through
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* OggFLAC__stream_decoder_set_client_data().
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*/
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typedef void (*OggFLAC__StreamDecoderErrorCallback)(const OggFLAC__StreamDecoder *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 stream decoder instance. The instance is created with
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* default settings; see the individual OggFLAC__stream_decoder_set_*()
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* functions for each setting's default.
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*
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* \retval OggFLAC__StreamDecoder*
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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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OggFLAC_API OggFLAC__StreamDecoder *OggFLAC__stream_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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OggFLAC_API void OggFLAC__stream_decoder_delete(OggFLAC__StreamDecoder *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 read callback.
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* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_read_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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_read_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderReadCallback value);
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/** Set the write callback.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_write_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderWriteCallback value);
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/** Set the metadata callback.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderMetadataCallback value);
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/** Set the error callback.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_error_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderErrorCallback 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 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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_client_data(OggFLAC__StreamDecoder *decoder, void *value);
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/** Set the serial number for the Ogg stream.
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* The default behavior is to use the serial number of the first Ogg
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* page. Setting a serial number here will explicitly define which
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* stream is to be decoded.
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*
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* \default \c use serial number of first page
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* \param decoder A decoder instance to set.
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* \param serial_number 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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_serial_number(OggFLAC__StreamDecoder *decoder, long serial_number);
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/** Direct the decoder to pass on all metadata blocks of type \a type.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_respond(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type);
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/** Direct the decoder to pass on all APPLICATION metadata blocks of the
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* given \a id.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
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/** Direct the decoder to pass on all metadata blocks of any type.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_all(OggFLAC__StreamDecoder *decoder);
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/** Direct the decoder to filter out all metadata blocks of type \a type.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type);
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/** Direct the decoder to filter out all APPLICATION metadata blocks of
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* the given \a id.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
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/** Direct the decoder to filter out all metadata blocks of any type.
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* This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_all(OggFLAC__StreamDecoder *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 OggFLAC__StreamDecoderState
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* The current decoder state.
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*/
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OggFLAC_API OggFLAC__StreamDecoderState OggFLAC__stream_decoder_get_state(const OggFLAC__StreamDecoder *decoder);
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/** Get the state of the underlying FLAC stream decoder.
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* Useful when the stream decoder state is
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* \c OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR.
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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__StreamDecoderState
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* The FLAC stream decoder state.
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*/
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OggFLAC_API FLAC__StreamDecoderState OggFLAC__stream_decoder_get_FLAC_stream_decoder_state(const OggFLAC__StreamDecoder *decoder);
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/** This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API unsigned OggFLAC__stream_decoder_get_channels(const OggFLAC__StreamDecoder *decoder);
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/** This is inherited from FLAC__StreamDecoder; see FLAC__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 OggFLAC__ChannelAssignment
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* See above.
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*/
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OggFLAC_API FLAC__ChannelAssignment OggFLAC__stream_decoder_get_channel_assignment(const OggFLAC__StreamDecoder *decoder);
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/** This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API unsigned OggFLAC__stream_decoder_get_bits_per_sample(const OggFLAC__StreamDecoder *decoder);
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/** This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API unsigned OggFLAC__stream_decoder_get_sample_rate(const OggFLAC__StreamDecoder *decoder);
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/** This is inherited from FLAC__StreamDecoder; see FLAC__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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OggFLAC_API unsigned OggFLAC__stream_decoder_get_blocksize(const OggFLAC__StreamDecoder *decoder);
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/** Initialize the decoder instance.
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* Should be called after OggFLAC__stream_decoder_new() and
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* OggFLAC__stream_decoder_set_*() but before any of the
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* OggFLAC__stream_decoder_process_*() functions. Will set and return the
|
|
* decoder state, which will be OggFLAC__STREAM_DECODER_OK
|
|
* if initialization succeeded.
|
|
*
|
|
* \param decoder An uninitialized decoder instance.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \retval OggFLAC__StreamDecoderState
|
|
* \c OggFLAC__STREAM_DECODER_OK if initialization was
|
|
* successful; see OggFLAC__StreamDecoderState for the meanings of other
|
|
* return values.
|
|
*/
|
|
OggFLAC_API OggFLAC__StreamDecoderState OggFLAC__stream_decoder_init(OggFLAC__StreamDecoder *decoder);
|
|
|
|
/** Finish the decoding process.
|
|
* Flushes the decoding buffer, releases resources, resets the decoder
|
|
* settings to their defaults, and returns the decoder state to
|
|
* OggFLAC__STREAM_DECODER_UNINITIALIZED.
|
|
*
|
|
* In the event of a prematurely-terminated decode, it is not strictly
|
|
* necessary to call this immediately before OggFLAC__stream_decoder_delete()
|
|
* but it is good practice to match every OggFLAC__stream_decoder_init()
|
|
* with an OggFLAC__stream_decoder_finish().
|
|
*
|
|
* \param decoder An uninitialized decoder instance.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
*/
|
|
OggFLAC_API void OggFLAC__stream_decoder_finish(OggFLAC__StreamDecoder *decoder);
|
|
|
|
/** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_flush()
|
|
*
|
|
* \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.
|
|
*/
|
|
OggFLAC_API FLAC__bool OggFLAC__stream_decoder_flush(OggFLAC__StreamDecoder *decoder);
|
|
|
|
/** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_reset()
|
|
*
|
|
* \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.
|
|
*/
|
|
OggFLAC_API FLAC__bool OggFLAC__stream_decoder_reset(OggFLAC__StreamDecoder *decoder);
|
|
|
|
/** Decode one metadata block or audio frame.
|
|
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_process_single()
|
|
*
|
|
* \param decoder An initialized decoder instance in the state
|
|
* \c OggFLAC__STREAM_DECODER_OK.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \code OggFLAC__stream_decoder_get_state(decoder) == OggFLAC__STREAM_DECODER_OK \endcode
|
|
* \retval FLAC__bool
|
|
* \c false if any read or write error occurred (except
|
|
* \c FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
|
|
* in any case, check the decoder state with
|
|
* OggFLAC__stream_decoder_get_state() to see what went wrong or to
|
|
* check for lost synchronization (a sign of stream corruption).
|
|
*/
|
|
OggFLAC_API FLAC__bool OggFLAC__stream_decoder_process_single(OggFLAC__StreamDecoder *decoder);
|
|
|
|
/** Decode until the end of the metadata.
|
|
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_process_until_end_of_metadata()
|
|
*
|
|
* \param decoder An initialized decoder instance in the state
|
|
* \c OggFLAC__STREAM_DECODER_OK.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \code OggFLAC__stream_decoder_get_state(decoder) == OggFLAC__STREAM_DECODER_OK \endcode
|
|
* \retval FLAC__bool
|
|
* \c false if any read or write error occurred (except
|
|
* \c OggFLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
|
|
* in any case, check the decoder state with
|
|
* OggFLAC__stream_decoder_get_state() to see what went wrong or to
|
|
* check for lost synchronization (a sign of stream corruption).
|
|
*/
|
|
OggFLAC_API FLAC__bool OggFLAC__stream_decoder_process_until_end_of_metadata(OggFLAC__StreamDecoder *decoder);
|
|
|
|
/** Decode until the end of the stream.
|
|
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_process_until_end_of_stream()
|
|
*
|
|
* \param decoder An initialized decoder instance in the state
|
|
* \c OggFLAC__STREAM_DECODER_OK.
|
|
* \assert
|
|
* \code decoder != NULL \endcode
|
|
* \code OggFLAC__stream_decoder_get_state(decoder) == OggFLAC__STREAM_DECODER_OK \endcode
|
|
* \retval FLAC__bool
|
|
* \c false if any read or write error occurred (except
|
|
* \c OggFLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC), else \c true;
|
|
* in any case, check the decoder state with
|
|
* OggFLAC__stream_decoder_get_state() to see what went wrong or to
|
|
* check for lost synchronization (a sign of stream corruption).
|
|
*/
|
|
OggFLAC_API FLAC__bool OggFLAC__stream_decoder_process_until_end_of_stream(OggFLAC__StreamDecoder *decoder);
|
|
|
|
/* \} */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|