flac/include/OggFLAC/stream_decoder.h
2002-08-07 17:39:24 +00:00

519 lines
19 KiB
C

/* libOggFLAC - Free Lossless Audio Codec + Ogg library
* Copyright (C) 2002 Josh Coalson
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef OggFLAC__STREAM_DECODER_H
#define OggFLAC__STREAM_DECODER_H
#include "FLAC/stream_decoder.h"
#ifdef __cplusplus
extern "C" {
#endif
/** \file include/OggFLAC/stream_decoder.h
*
* \brief
* This module contains the functions which implement the stream
* decoder.
*
* See the detailed documentation in the
* \link oggflac_stream_decoder stream decoder \endlink module.
*/
/** \defgroup oggflac_decoder OggFLAC/ *_decoder.h: decoder interfaces
* \ingroup oggflac
*
* \brief
* This module describes the three decoder layers provided by libOggFLAC.
*
* libOggFLAC provides the same three layers of access as libFLAC and the
* interface is identical. See the \link flac_decoder FLAC decoder module
* \endlink for full documentation.
*/
/** \defgroup oggflac_stream_decoder OggFLAC/stream_decoder.h: stream decoder interface
* \ingroup oggflac_decoder
*
* \brief
* This module contains the functions which implement the stream
* decoder.
*
* The interface here is identical to FLAC's stream decoder. See the
* defaults, including the callbacks. See the \link flac_stream_decoder
* FLAC stream decoder module \endlink for full documentation.
*
* \{
*/
/** State values for an OggFLAC__StreamDecoder
*
* The decoder's state can be obtained by calling OggFLAC__stream_decoder_get_state().
*/
typedef enum {
OggFLAC__STREAM_DECODER_OK = 0,
/**< The decoder is in the normal OK state. */
OggFLAC__STREAM_DECODER_OGG_ERROR,
/**< An error occurred in the underlying Ogg layer. */
OggFLAC__STREAM_DECODER_READ_ERROR,
/**< The read callback returned an error. */
OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR,
/**< An error occurred in the underlying FLAC stream decoder;
* check OggFLAC__stream_decoder_get_FLAC_stream_decoder_state().
*/
OggFLAC__STREAM_DECODER_INVALID_CALLBACK,
/**< The decoder was initialized before setting all the required callbacks. */
OggFLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR,
/**< Memory allocation failed. */
OggFLAC__STREAM_DECODER_ALREADY_INITIALIZED,
/**< OggFLAC__stream_decoder_init() was called when the decoder was
* already initialized, usually because
* OggFLAC__stream_decoder_finish() was not called.
*/
OggFLAC__STREAM_DECODER_UNINITIALIZED
/**< The decoder is in the uninitialized state. */
} OggFLAC__StreamDecoderState;
/** Maps an OggFLAC__StreamDecoderState to a C string.
*
* Using an OggFLAC__StreamDecoderState as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern const char * const OggFLAC__StreamDecoderStateString[];
/***********************************************************************
*
* class OggFLAC__StreamDecoder
*
***********************************************************************/
struct OggFLAC__StreamDecoderProtected;
struct OggFLAC__StreamDecoderPrivate;
/** The opaque structure definition for the stream decoder type.
* See the \link oggflac_stream_decoder stream decoder module \endlink
* for a detailed description.
*/
typedef struct {
struct OggFLAC__StreamDecoderProtected *protected_; /* avoid the C++ keyword 'protected' */
struct OggFLAC__StreamDecoderPrivate *private_; /* avoid the C++ keyword 'private' */
} OggFLAC__StreamDecoder;
typedef FLAC__StreamDecoderReadStatus (*OggFLAC__StreamDecoderReadCallback)(const OggFLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
typedef FLAC__StreamDecoderWriteStatus (*OggFLAC__StreamDecoderWriteCallback)(const OggFLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
typedef void (*OggFLAC__StreamDecoderMetadataCallback)(const OggFLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
typedef void (*OggFLAC__StreamDecoderErrorCallback)(const OggFLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
/***********************************************************************
*
* Class constructor/destructor
*
***********************************************************************/
/** Create a new stream decoder instance. The instance is created with
* default settings; see the individual OggFLAC__stream_decoder_set_*()
* functions for each setting's default.
*
* \retval OggFLAC__StreamDecoder*
* \c NULL if there was an error allocating memory, else the new instance.
*/
OggFLAC__StreamDecoder *OggFLAC__stream_decoder_new();
/** Free a decoder instance. Deletes the object pointed to by \a decoder.
*
* \param decoder A pointer to an existing decoder.
* \assert
* \code decoder != NULL \endcode
*/
void OggFLAC__stream_decoder_delete(OggFLAC__StreamDecoder *decoder);
/***********************************************************************
*
* Public class method prototypes
*
***********************************************************************/
/** Set the read callback.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_read_callback()
*
* \note
* The callback is mandatory and must be set before initialization.
*
* \default \c NULL
* \param decoder An decoder instance to set.
* \param value See above.
* \assert
* \code decoder != NULL \endcode
* \code value != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_read_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderReadCallback);
/** Set the write callback.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_write_callback()
*
* \note
* The callback is mandatory and must be set before initialization.
*
* \default \c NULL
* \param decoder An decoder instance to set.
* \param value See above.
* \assert
* \code decoder != NULL \endcode
* \code value != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_write_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderWriteCallback);
/** Set the metadata callback.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_callback()
*
* \note
* The callback is mandatory and must be set before initialization.
*
* \default \c NULL
* \param decoder An decoder instance to set.
* \param value See above.
* \assert
* \code decoder != NULL \endcode
* \code value != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_metadata_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderMetadataCallback);
/** Set the error callback.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_error_callback()
*
* \note
* The callback is mandatory and must be set before initialization.
*
* \default \c NULL
* \param decoder An decoder instance to set.
* \param value See above.
* \assert
* \code decoder != NULL \endcode
* \code value != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_error_callback(OggFLAC__StreamDecoder *decoder, OggFLAC__StreamDecoderErrorCallback);
/** Set the client data to be passed back to callbacks.
* This value will be supplied to callbacks in their \a client_data
* argument.
*
* \default \c NULL
* \param decoder An decoder instance to set.
* \param value See above.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_client_data(OggFLAC__StreamDecoder *decoder, void *value);
/** Direct the decoder to pass on all metadata blocks of type \a type.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_respond()
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param type See above.
* \assert
* \code decoder != NULL \endcode
* \a type is valid
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_metadata_respond(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type);
/** Direct the decoder to pass on all APPLICATION metadata blocks of the
* given \a id.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_respond_application()
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param id See above.
* \assert
* \code decoder != NULL \endcode
* \code id != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
/** Direct the decoder to pass on all metadata blocks of any type.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_respond_all()
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_metadata_respond_all(OggFLAC__StreamDecoder *decoder);
/** Direct the decoder to filter out all metadata blocks of type \a type.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_ignore()
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param type See above.
* \assert
* \code decoder != NULL \endcode
* \a type is valid
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore(OggFLAC__StreamDecoder *decoder, FLAC__MetadataType type);
/** Direct the decoder to filter out all APPLICATION metadata blocks of
* the given \a id.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_ignore_application()
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \param id See above.
* \assert
* \code decoder != NULL \endcode
* \code id != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_application(OggFLAC__StreamDecoder *decoder, const FLAC__byte id[4]);
/** Direct the decoder to filter out all metadata blocks of any type.
* This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_set_metadata_ignore_all()
*
* \default By default, only the \c STREAMINFO block is returned via the
* metadata callback.
* \param decoder A decoder instance to set.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__bool
* \c false if the decoder is already initialized, else \c true.
*/
FLAC__bool OggFLAC__stream_decoder_set_metadata_ignore_all(OggFLAC__StreamDecoder *decoder);
/** Get the current decoder state.
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval OggFLAC__StreamDecoderState
* The current decoder state.
*/
OggFLAC__StreamDecoderState OggFLAC__stream_decoder_get_state(const OggFLAC__StreamDecoder *decoder);
/** Get the state of the underlying FLAC stream decoder.
* Useful when the stream decoder state is
* \c OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR.
*
* \param decoder An decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval FLAC__StreamDecoderState
* The FLAC stream decoder state.
*/
FLAC__StreamDecoderState OggFLAC__stream_decoder_get_FLAC_stream_decoder_state(const OggFLAC__StreamDecoder *decoder);
/** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_channels()
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval unsigned
* See above.
*/
unsigned OggFLAC__stream_decoder_get_channels(const OggFLAC__StreamDecoder *decoder);
/** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_channel_assignment()
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval OggFLAC__ChannelAssignment
* See above.
*/
FLAC__ChannelAssignment OggFLAC__stream_decoder_get_channel_assignment(const OggFLAC__StreamDecoder *decoder);
/** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_bits_per_sample()
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval unsigned
* See above.
*/
unsigned OggFLAC__stream_decoder_get_bits_per_sample(const OggFLAC__StreamDecoder *decoder);
/** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_sample_rate()
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval unsigned
* See above.
*/
unsigned OggFLAC__stream_decoder_get_sample_rate(const OggFLAC__StreamDecoder *decoder);
/** This is inherited from FLAC__StreamDecoder; see FLAC__stream_decoder_get_blocksize()
*
* \param decoder A decoder instance to query.
* \assert
* \code decoder != NULL \endcode
* \retval unsigned
* See above.
*/
unsigned OggFLAC__stream_decoder_get_blocksize(const OggFLAC__StreamDecoder *decoder);
/** Initialize the decoder instance.
* Should be called after OggFLAC__stream_decoder_new() and
* OggFLAC__stream_decoder_set_*() but before any of the
* 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__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
*/
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.
*/
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.
*/
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 false;
* 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).
*/
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 false;
* 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).
*/
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 false;
* 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).
*/
FLAC__bool OggFLAC__stream_decoder_process_until_end_of_stream(OggFLAC__StreamDecoder *decoder);
/* \} */
#ifdef __cplusplus
}
#endif
#endif