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Josh Coalson 2002-07-24 06:15:56 +00:00
parent 47ca4f423b
commit 5cc58dfc3a
3 changed files with 429 additions and 48 deletions
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24
include/FLAC/all.h
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@ -31,7 +31,7 @@
/** \mainpage
*
* \section intro Introduction.
* \section intro Introduction
*
* This is the documentation for the FLAC C and C++ APIs. It is
* highly interconnected; this introduction should give you a top
@ -40,12 +40,29 @@
* knowledge of the FLAC format, documented
* <A HREF="../format.html">here</A>.
*
* \section c_api FLAC C API
*
* The FLAC C API is the interface to libFLAC, a set of structures
* describing the components of FLAC streams, and functions for
* encoding and decoding streams, as well as manipulating FLAC
* metadata in files. The public include files will be installed
* in your include area as <include>/FLAC/...
*
* By writing a little code and linking against libFLAC, it is
* relatively easy to add FLAC support to another program. The
* library is licensed under the
* <A HREF="http://www.gnu.org/copyleft/lesser.html">LGPL</A>.
* Complete source code of libFLAC as well as the command-line
* encoder and plugins is available and is a useful source of
* examples.
*
* libFLAC usually only requires the standard C library and C math
* library. In particular, threading is not used so there is no
* dependency on a thread library. However, libFLAC does not use
* global variables and should be thread-safe.
*
* \section cpp_api FLAC C API
*
* The FLAC C++ API is a set of classes that encapsulate the
* structures and functions in libFLAC. They provide slightly more
* functionality with respect to metadata but are otherwise
@ -55,6 +72,11 @@
* for the C++ API will be installed in your include area as
* <include>/FLAC++/...
*
* libFLAC++ is also licensed under the
* <A HREF="http://www.gnu.org/copyleft/lesser.html">LGPL</A>.
*
* \section getting_started Getting Started
*
* A good starting point for learning the API is to browse through
* the <A HREF="modules.html">modules</A>. Modules are logical
* groupings of related functions or classes, which correspond roughly

8
include/FLAC/format.h
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@ -552,13 +552,7 @@ typedef struct {
extern const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN; /**< == 32 (bits) */
/*****************************************************************************
*
* 1: =1 if this is the last meta-data block, else =0
* 7: meta-data type (c.f. FLAC__MetadataType)
* 24: length (in bytes) of the block-specific data to follow
*---- -----------------
* 4 bytes total
/** FLAC metadata block structure. (c.f. <A HREF="../format.html#metadata_block">format specification</A>)
*/
typedef struct {
FLAC__MetadataType type;

445
include/FLAC/stream_encoder.h
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@ -27,35 +27,171 @@ extern "C" {
#endif
/** \file include/FLAC/stream_encoder.h
*
* \brief
* This module contains the functions which implement the stream
* encoder.
*
* See the detailed documentation in the
* \link flac_stream_encoder stream encoder \endlink module.
*/
/** \defgroup flac_stream_encoder FLAC/stream_encoder.h: stream encoder interface
* \ingroup flac
*
* \brief
* This module contains the functions which implement the stream
* encoder.
*
* The basic usage of a libFLAC encoder is as follows:
* - The program creates an instance of an encoder using
* FLAC__stream_encoder_new().
* - The program overrides the default settings and sets callbacks for
* reading, writing, error reporting, and metadata reporting using
* FLAC__stream_encoder_set_*() functions.
* - The program initializes the instance to validate the settings and
* prepare for encoding using FLAC__stream_encoder_init().
* - The program calls FLAC__stream_encoder_process() or
* FLAC__stream_encoder_process_interleaved() to encode data, which
* subsequently calls the callbacks.
* - The program finishes the instance with FLAC__stream_encoder_finish(),
* which flushes the input and output and resets the encoder to the
* unitialized state.
* - The instance may be used again or deleted with
* FLAC__stream_encoder_delete().
*
* \note
* The "set" functions may only be called when the encoder is in the
* state FLAC__STREAM_ENCODER_UNINITIALIZED, i.e. after
* FLAC__stream_encoder_new() or FLAC__stream_encoder_finish(), but
* before FLAC__stream_encoder_init(). If this is the case they will
* return true, otherwise false.
*
* \note
* The "set" functions do not validate the values as many are
* interdependent. The FLAC__stream_encoder_init() function will do
* this, so make sure to pay attention to the state returned by
* FLAC__stream_encoder_init() to make sure that it is
* FLAC__STREAM_ENCODER_OK.
*
* \note
* Unlike the decoders, the stream encoder has many options that can
* affect the speed and compression ratio. When setting these parameters
* you should have some basic knowledge of the format (see the
* <A HREF="../documentation.html#format">user-level documentation</A>
* or the <A HREF="../format.html">formal description</A>).
*
* \note
* Any parameters that are not set before FLAC__stream_encoder_init()
* will take on the defaults from the constructor.
*
* \note
* FLAC__stream_encoder_finish() resets all settings to the constructor
* defaults, including the callbacks.
*
* \{
*/
/** State values for a FLAC__StreamEncoder
*
* The encoder's state can be obtained by calling FLAC__stream_encoder_get_state().
*/
typedef enum {
FLAC__STREAM_ENCODER_OK = 0,
/**< The encoder is in the normal OK state. */
FLAC__STREAM_ENCODER_INVALID_CALLBACK,
/**< The encoder was initialized before setting all the required callbacks. */
FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS,
/**< The encoder has an invalid setting for number of channels. */
FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE,
/**< The encoder has an invalid setting for bits-per-sample.
* FLAC supports 4-32 bps but the reference encoder currently supports
* only up to 24 bps.
*/
FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE,
/**< The encoder has an invalid setting for the input sample rate. */
FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE,
/**< The encoder has an invalid setting for the block size. */
FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION,
/**< The encoder has an invalid setting for the precision of the quantized linear predictor coefficients. */
FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH,
/**< Mid/side coding was specified but the number of channels is not equal to 2. */
FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH,
/**< Deprecated. */
FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE,
/**< Loose mid/side coding was specified but mid/side coding was not. */
FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER,
/**< The specified block size is less than the maximum LPC order. */
FLAC__STREAM_ENCODER_NOT_STREAMABLE,
/**< The encoder is bound to the "streamable subset" but other settings violate it. */
FLAC__STREAM_ENCODER_FRAMING_ERROR,
/**< An error occurred while writing the stream; usually, the write_callback returned an error. */
FLAC__STREAM_ENCODER_INVALID_METADATA,
/**< The metadata input to the encoder is invalid. */
FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING,
FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING, /* that is, the write_callback returned an error */
/**< An error occurred while writing the stream; usually, the write_callback returned an error. */
FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING,
/**< The write_callback returned an error. */
FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR,
/**< Memory allocation failed. */
FLAC__STREAM_ENCODER_ALREADY_INITIALIZED,
/**< FLAC__stream_encoder_init() was called when the encoder was
* already initialized, usually because
* FLAC__stream_encoder_finish() was not called.
*/
FLAC__STREAM_ENCODER_UNINITIALIZED
/**< The encoder is in the uninitialized state. */
} FLAC__StreamEncoderState;
/** Maps a FLAC__StreamEncoderState to a C string.
*
* Using a FLAC__StreamEncoderState as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern const char * const FLAC__StreamEncoderStateString[];
/** Return values for the FLAC__StreamEncoder write callback.
*/
typedef enum {
FLAC__STREAM_ENCODER_WRITE_OK = 0,
/**< The write was OK and encoding can continue. */
FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR
/**< An unrecoverable error occurred. The encoder will return from the process call. */
} FLAC__StreamEncoderWriteStatus;
/** Maps a FLAC__StreamEncoderWriteStatus to a C string.
*
* Using a FLAC__StreamEncoderWriteStatus as the index to this array
* will give the string equivalent. The contents should not be modified.
*/
extern const char * const FLAC__StreamEncoderWriteStatusString[];
/***********************************************************************
*
* class FLAC__StreamEncoder
@ -64,46 +200,35 @@ extern const char * const FLAC__StreamEncoderWriteStatusString[];
struct FLAC__StreamEncoderProtected;
struct FLAC__StreamEncoderPrivate;
/** The opaque structure definition for the stream encoder type.
*/
typedef struct {
struct FLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
struct FLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
} FLAC__StreamEncoder;
/***********************************************************************
*
* Class constructor/destructor
*
***********************************************************************/
/*
* Any parameters that are not set before FLAC__stream_encoder_init()
* will take on the defaults from the constructor, shown below.
* For more on what the parameters mean, see the documentation.
/** Create a new stream encoder instance. The instance is created with
* default settings; see the individual FLAC__stream_encoder_set_*()
* functions for each setting's default.
*
* FLAC__bool streamable_subset (DEFAULT: true ) true to limit encoder to generating a Subset stream, else false
* FLAC__bool do_mid_side_stereo (DEFAULT: false ) if true then channels must be 2
* FLAC__bool loose_mid_side_stereo (DEFAULT: false ) if true then do_mid_side_stereo must be true
* unsigned channels (DEFAULT: 2 ) must be <= FLAC__MAX_CHANNELS
* unsigned bits_per_sample (DEFAULT: 16 ) do not give the encoder wider data than what you specify here or bad things will happen!
* unsigned sample_rate (DEFAULT: 44100 )
* unsigned blocksize (DEFAULT: 1152 )
* unsigned max_lpc_order (DEFAULT: 0 ) 0 => encoder will not try general LPC, only fixed predictors; must be <= FLAC__MAX_LPC_ORDER
* unsigned qlp_coeff_precision (DEFAULT: 0 ) >= FLAC__MIN_QLP_COEFF_PRECISION, or 0 to let encoder select based on blocksize;
* qlp_coeff_precision+bits_per_sample must be < 32
* FLAC__bool do_qlp_coeff_prec_search (DEFAULT: false ) false => use qlp_coeff_precision, true => search around qlp_coeff_precision, take best
* FLAC__bool do_escape_coding (DEFAULT: false ) true => search for escape codes in the entropy coding stage for slightly better compression
* FLAC__bool do_exhaustive_model_search (DEFAULT: false ) false => use estimated bits per residual for scoring, true => generate all, take shortest
* unsigned min_residual_partition_order (DEFAULT: 0 ) 0 => estimate Rice parameter based on residual variance; >0 => partition residual, use parameter
* unsigned max_residual_partition_order (DEFAULT: 0 ) for each based on mean; min_ and max_ specify the min and max Rice partition order
* unsigned rice_parameter_search_dist (DEFAULT: 0 ) 0 => try only calc'd parameter k; else try all [k-dist..k+dist] parameters, use best
* FLAC__uint64 total_samples_estimate (DEFAULT: 0 ) may be 0 if unknown. acts as a placeholder in the STREAMINFO until the actual total is calculated
* FLAC__StreamMetadata **metadata (DEFAULT: NULL,0) optional metadata blocks to prepend. STREAMINFO is not allowed since it is done internally.
* + unsigned num_blocks
* (*write_callback)() (DEFAULT: NULL ) The callbacks are the only values that MUST be set before FLAC__stream_encoder_init()
* (*metadata_callback)() (DEFAULT: NULL )
* void* client_data (DEFAULT: NULL ) passed back through the callbacks
* \retval FLAC__StreamEncoder*
* \c NULL if there was an error allocating memory, else the new instance.
*/
FLAC__StreamEncoder *FLAC__stream_encoder_new();
/** Free an encoder instance. Deletes the object pointed to by \a encoder.
*
* \param encoder A pointer to an existing encoder.
* \assert
* \code encoder != NULL \endcode
*/
void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder);
/***********************************************************************
@ -113,41 +238,279 @@ void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder);
***********************************************************************/
/*
* Various "set" methods. These may only be called when the encoder
* is in the state FLAC__STREAM_ENCODER_UNINITIALIZED, i.e. after
* FLAC__stream_encoder_new() or FLAC__stream_encoder_finish(), but
* before FLAC__stream_encoder_init(). If this is the case they will
* return true, otherwise false.
* FLAC__bool do_qlp_coeff_prec_search (DEFAULT: false ) false => use qlp_coeff_precision, true => search around qlp_coeff_precision, take best
* FLAC__bool do_escape_coding (DEFAULT: false ) true => search for escape codes in the entropy coding stage for slightly better compression
* FLAC__bool do_exhaustive_model_search (DEFAULT: false ) false => use estimated bits per residual for scoring, true => generate all, take shortest
* unsigned min_residual_partition_order (DEFAULT: 0 ) 0 => estimate Rice parameter based on residual variance; >0 => partition residual, use parameter
* unsigned max_residual_partition_order (DEFAULT: 0 ) for each based on mean; min_ and max_ specify the min and max Rice partition order
* unsigned rice_parameter_search_dist (DEFAULT: 0 ) 0 => try only calc'd parameter k; else try all [k-dist..k+dist] parameters, use best
* FLAC__uint64 total_samples_estimate (DEFAULT: 0 ) may be 0 if unknown. acts as a placeholder in the STREAMINFO until the actual total is calculated
* FLAC__StreamMetadata **metadata (DEFAULT: NULL,0) optional metadata blocks to prepend. STREAMINFO is not allowed since it is done internally.
* + unsigned num_blocks
* void* client_data (DEFAULT: NULL ) passed back through the callbacks
*/
/** Set the "streamable subset" flag. If \c true, the encoder will comply
* with the subset (see the format specification) and will check the
* settings during FLAC__stream_encoder_init() to see if all settings
* comply. If \c false, the settings may take advantage of the full
* range that the format allows.
*
* NOTE that these functions do not validate the values as many are
* interdependent. The FLAC__stream_encoder_init() function will do
* this, so make sure to pay attention to the state returned by
* FLAC__stream_encoder_init().
* Make sure you know what it entails before setting this to \c false.
*
* Any parameters that are not set before FLAC__stream_encoder_init()
* will take on the defaults from the constructor. NOTE that
* FLAC__stream_encoder_finish() does NOT reset the values to the
* constructor defaults.
* \default \c true
* \param encoder An encoder instance to set.
* \param value Flag value (see above).
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value);
/** Set to \c true to enable mid-side encoding on stereo input. The
* number of channels must be 2. Set to \c false to use only
* independent channel coding.
*
* \default \c false
* \param encoder An encoder instance to set.
* \param value Flag value (see above).
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
/** Set to \c true to enable adaptive switching between mid-side and
* left-right encoding on stereo input. The number of channels must
* be 2. Set to \c false to use exhaustive searching. In either
* case, the mid/side stereo setting must be \c true.
*
* \default \c false
* \param encoder An encoder instance to set.
* \param value Flag value (see above).
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
/** Set the number of channels to be encoded.
*
* \default \c 2
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the sample resolution of the input to be encoded.
*
* \warning
* Do not feed the encoder data that is wider than the value you
* set here or you will generate an invalid stream.
*
* \default \c 16
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the sample rate (in Hz) of the input to be encoded.
*
* \default \c 44100
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the blocksize to use while encoding.
*
* \default \c 1152
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the maximum LPC order, or \c 0 to use only the fixed predictors.
*
* \default \c 0
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the precision, in bits, of the quantized linear predictor
* coefficients, or \c 0 to let the encoder select it based on the
* blocksize.
*
* \note
* In the current implementation, qlp_coeff_precision + bits_per_sample must
* be less than 32.
*
* \default \c 0
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the number of channels to be encoded.
*
* \default \c false
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
/** Set the number of channels to be encoded.
*
* \default \c false
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value);
/** Set the number of channels to be encoded.
*
* \default \c false
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
/** Set the number of channels to be encoded.
*
* \default \c 0
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the number of channels to be encoded.
*
* \default \c 0
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the number of channels to be encoded.
*
* \default \c 0
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value);
/** Set the number of channels to be encoded.
*
* \default \c 0
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value);
/** Set the number of channels to be encoded.
*
* \default \c NULL, 0
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks);
/** Set the number of channels to be encoded.
*
* \default \c NULL; the callback is mandatory and must be set before initialization
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \code value != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_write_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteStatus (*value)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data));
/** Set the number of channels to be encoded.
*
* \default \c NULL; the callback is mandatory and must be set before initialization
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \code value != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_metadata_callback(FLAC__StreamEncoder *encoder, void (*value)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data));
/** Set the number of channels to be encoded.
*
* \default \c NULL
* \param encoder An encoder instance to set.
* \param value See above.
* \assert
* \code encoder != NULL \endcode
* \retval FLAC__bool
* \c false if the encoder is already initialized, else \c true.
*/
FLAC__bool FLAC__stream_encoder_set_client_data(FLAC__StreamEncoder *encoder, void *value);
/*
@ -191,6 +554,8 @@ void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder);
FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples);
FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples);
/* \} */
#ifdef __cplusplus
}
#endif