stream_encoder.h
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C/C++
- /* libFLAC - Free Lossless Audio Codec library
- * Copyright (C) 2000,2001,2002,2003,2004,2005 Josh Coalson
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of the Xiph.org Foundation nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #ifndef FLAC__STREAM_ENCODER_H
- #define FLAC__STREAM_ENCODER_H
- #include "export.h"
- #include "format.h"
- #include "stream_decoder.h"
- #ifdef __cplusplus
- 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_encoder FLAC/ *_encoder.h: encoder interfaces
- * ingroup flac
- *
- * brief
- * This module describes the two encoder layers provided by libFLAC.
- *
- * For encoding FLAC streams, libFLAC provides three layers of access. The
- * lowest layer is non-seekable stream-level encoding, the next is seekable
- * stream-level encoding, and the highest layer is file-level encoding. The
- * interfaces are described in the link flac_stream_encoder stream encoder
- * endlink, link flac_seekable_stream_encoder seekable stream encoder
- * endlink, and link flac_file_encoder file encoder endlink modules
- * respectively. Typically you will choose the highest layer that your input
- * source will support.
- * The stream encoder relies on callbacks for writing the data and
- * metadata. The file encoder provides these callbacks internally and you
- * need only supply the filename.
- *
- * The stream encoder relies on callbacks for writing the data and has no
- * provisions for seeking the output. The seekable stream encoder wraps
- * the stream encoder and also automaticallay handles the writing back of
- * metadata discovered while encoding. However, you must provide extra
- * callbacks for seek-related operations on your output, like seek and
- * tell. The file encoder wraps the seekable stream encoder and supplies
- * all of the callbacks internally, simplifying the processing of standard
- * files. The only callback exposed is for progress reporting, and that
- * is optional.
- */
- /** defgroup flac_stream_encoder FLAC/stream_encoder.h: stream encoder interface
- * ingroup flac_encoder
- *
- * brief
- * This module contains the functions which implement the stream
- * encoder.
- *
- * The basic usage of this 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 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 when there is encoder data ready
- * to be written.
- * - The program finishes the encoding with FLAC__stream_encoder_finish(),
- * which causes the encoder to encode any data still in its input pipe,
- * call the metadata callback with the final encoding statistics, and
- * finally reset the encoder to the uninitialized state.
- * - The instance may be used again or deleted with
- * FLAC__stream_encoder_delete().
- *
- * In more detail, the stream encoder functions similarly to the
- * link flac_stream_decoder stream decoder endlink, but has fewer
- * callbacks and more options. Typically the user will create a new
- * instance by calling FLAC__stream_encoder_new(), then set the necessary
- * parameters and callbacks with FLAC__stream_encoder_set_*(), and
- * initialize it by calling FLAC__stream_encoder_init().
- *
- * 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>). The
- * FLAC__stream_encoder_set_*() functions themselves 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. Any parameters that are not set before
- * FLAC__stream_encoder_init() will take on the defaults from the
- * constructor.
- *
- * The user must provide function pointers for the following callbacks:
- *
- * - Write callback - This function is called by the encoder anytime there
- * is raw encoded data to write. It may include metadata mixed with
- * encoded audio frames and the data is not guaranteed to be aligned on
- * frame or metadata block boundaries.
- * - Metadata callback - This function is called once at the end of
- * encoding with the populated STREAMINFO structure. This is so file
- * encoders can seek back to the beginning of the file and write the
- * STREAMINFO block with the correct statistics after encoding (like
- * minimum/maximum frame size).
- *
- * The call to FLAC__stream_encoder_init() currently will also immediately
- * call the write callback several times, once with the c fLaC signature,
- * and once for each encoded metadata block.
- *
- * After initializing the instance, the user may feed audio data to the
- * encoder in one of two ways:
- *
- * - Channel separate, through FLAC__stream_encoder_process() - The user
- * will pass an array of pointers to buffers, one for each channel, to
- * the encoder, each of the same length. The samples need not be
- * block-aligned.
- * - Channel interleaved, through
- * FLAC__stream_encoder_process_interleaved() - The user will pass a single
- * pointer to data that is channel-interleaved (i.e. channel0_sample0,
- * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
- * Again, the samples need not be block-aligned but they must be
- * sample-aligned, i.e. the first value should be channel0_sample0 and
- * the last value channelN_sampleM.
- *
- * When the user is finished encoding data, it calls
- * FLAC__stream_encoder_finish(), which causes the encoder to encode any
- * data still in its input pipe, and call the metadata callback with the
- * final encoding statistics. Then the instance may be deleted with
- * FLAC__stream_encoder_delete() or initialized again to encode another
- * stream.
- *
- * For programs that write their own metadata, but that do not know the
- * actual metadata until after encoding, it is advantageous to instruct
- * the encoder to write a PADDING block of the correct size, so that
- * instead of rewriting the whole stream after encoding, the program can
- * just overwrite the PADDING block. If only the maximum size of the
- * metadata is known, the program can write a slightly larger padding
- * block, then split it after encoding.
- *
- * Make sure you understand how lengths are calculated. All FLAC metadata
- * blocks have a 4 byte header which contains the type and length. This
- * length does not include the 4 bytes of the header. See the format page
- * for the specification of metadata blocks and their lengths.
- *
- * 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 c true, otherwise c false.
- *
- * 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_VERIFY_DECODER_ERROR,
- /**< An error occurred in the underlying verify stream decoder;
- * check FLAC__stream_encoder_get_verify_decoder_state().
- */
- FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA,
- /**< The verify decoder detected a mismatch between the original
- * audio signal and the decoded audio signal.
- */
- 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_MAX_LPC_ORDER,
- /**< The encoder has an invalid setting for the maximum LPC order. */
- 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, in one of the following ways:
- * - FLAC__stream_encoder_set_metadata() was called with a null pointer but a block count > 0
- * - One of the metadata blocks contains an undefined type
- * - It contains an illegal CUESHEET as checked by FLAC__format_cuesheet_is_legal()
- * - It contains an illegal SEEKTABLE as checked by FLAC__format_seektable_is_legal()
- * - It contains more than one SEEKTABLE block or more than one VORBIS_COMMENT block
- */
- FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING,
- /**< 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 FLAC_API const char * const FLAC__StreamEncoderStateString[];
- /** Return values for the FLAC__StreamEncoder write callback.
- */
- typedef enum {
- FLAC__STREAM_ENCODER_WRITE_STATUS_OK = 0,
- /**< The write was OK and encoding can continue. */
- FLAC__STREAM_ENCODER_WRITE_STATUS_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 FLAC_API const char * const FLAC__StreamEncoderWriteStatusString[];
- /***********************************************************************
- *
- * class FLAC__StreamEncoder
- *
- ***********************************************************************/
- struct FLAC__StreamEncoderProtected;
- struct FLAC__StreamEncoderPrivate;
- /** The opaque structure definition for the stream encoder type.
- * See the link flac_stream_encoder stream encoder module endlink
- * for a detailed description.
- */
- typedef struct {
- struct FLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
- struct FLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
- } FLAC__StreamEncoder;
- /** Signature for the write callback.
- * See FLAC__stream_encoder_set_write_callback() for more info.
- *
- * param encoder The encoder instance calling the callback.
- * param buffer An array of encoded data of length a bytes.
- * param bytes The byte length of a buffer.
- * param samples The number of samples encoded by a buffer.
- * c 0 has a special meaning; see
- * FLAC__stream_encoder_set_write_callback().
- * param current_frame The number of the current frame being encoded.
- * param client_data The callee's client data set through
- * FLAC__stream_encoder_set_client_data().
- * retval FLAC__StreamEncoderWriteStatus
- * The callee's return status.
- */
- typedef FLAC__StreamEncoderWriteStatus (*FLAC__StreamEncoderWriteCallback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
- /** Signature for the metadata callback.
- * See FLAC__stream_encoder_set_metadata_callback() for more info.
- *
- * param encoder The encoder instance calling the callback.
- * param metadata The final populated STREAMINFO block.
- * param client_data The callee's client data set through
- * FLAC__stream_encoder_set_client_data().
- */
- typedef void (*FLAC__StreamEncoderMetadataCallback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data);
- /***********************************************************************
- *
- * Class constructor/destructor
- *
- ***********************************************************************/
- /** 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.
- *
- * retval FLAC__StreamEncoder*
- * c NULL if there was an error allocating memory, else the new instance.
- */
- FLAC_API 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
- */
- FLAC_API void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder);
- /***********************************************************************
- *
- * Public class method prototypes
- *
- ***********************************************************************/
- /** Set the "verify" flag. If c true, the encoder will verify it's own
- * encoded output by feeding it through an internal decoder and comparing
- * the original signal against the decoded signal. If a mismatch occurs,
- * the process call will return c false. Note that this will slow the
- * encoding process by the extra time required for decoding and comparison.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value);
- /** 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.
- *
- * Make sure you know what it entails before setting this to c false.
- *
- * 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_API 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_API 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_API 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_API 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_API 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_API 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_API 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_API 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_API FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value);
- /** Set to c false to use only the specified quantized linear predictor
- * coefficient precision, or c true to search neighboring precision
- * values and use the best one.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
- /** Deprecated. Setting this value has no effect.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value);
- /** Set to c false to let the encoder estimate the best model order
- * based on the residual signal energy, or c true to force the
- * encoder to evaluate all order models and select the best.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
- /** Set the minimum partition order to search when coding the residual.
- * This is used in tandem with
- * FLAC__stream_encoder_set_max_residual_partition_order().
- *
- * The partition order determines the context size in the residual.
- * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
- *
- * Set both min and max values to c 0 to force a single context,
- * whose Rice parameter is based on the residual signal variance.
- * Otherwise, set a min and max order, and the encoder will search
- * all orders, using the mean of each context for its Rice parameter,
- * and use the best.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
- /** Set the maximum partition order to search when coding the residual.
- * This is used in tandem with
- * FLAC__stream_encoder_set_min_residual_partition_order().
- *
- * The partition order determines the context size in the residual.
- * The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
- *
- * Set both min and max values to c 0 to force a single context,
- * whose Rice parameter is based on the residual signal variance.
- * Otherwise, set a min and max order, and the encoder will search
- * all orders, using the mean of each context for its Rice parameter,
- * and use the best.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
- /** Deprecated. Setting this value has no effect.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value);
- /** Set an estimate of the total samples that will be encoded.
- * This is merely an estimate and may be set to c 0 if unknown.
- * This value will be written to the STREAMINFO block before encoding,
- * and can remove the need for the caller to rewrite the value later
- * if the value is known before encoding.
- *
- * 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_API FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value);
- /** Set the metadata blocks to be emitted to the stream before encoding.
- * A value of c NULL, c 0 implies no metadata; otherwise, supply an
- * array of pointers to metadata blocks. The array is non-const since
- * the encoder may need to change the a is_last flag inside them.
- * Otherwise, the encoder will not modify or free the blocks. It is up
- * to the caller to free the metadata blocks after encoding.
- *
- * note
- * The encoder stores only the a metadata pointer; the passed-in array
- * must survive at least until after FLAC__stream_encoder_init() returns.
- * Do not modify the array or free the blocks until then.
- *
- * note
- * The STREAMINFO block is always written and no STREAMINFO block may
- * occur in the supplied array.
- *
- * note
- * By default the encoder does not create a SEEKTABLE. If one is supplied
- * in the a metadata array it will be written verbatim. However by itself
- * this is not very useful as the user will not know the stream offsets for
- * the seekpoints ahead of time. You must use the seekable stream encoder
- * to generate a legal seektable
- * (see FLAC__seekable_stream_encoder_set_metadata())
- *
- * note
- * A VORBIS_COMMENT block may be supplied. The vendor string in it
- * will be ignored. libFLAC will use it's own vendor string. libFLAC
- * will not modify the passed-in VORBIS_COMMENT's vendor string, it
- * will simply write it's own into the stream. If no VORBIS_COMMENT
- * block is present in the a metadata array, libFLAC will write an
- * empty one, containing only the vendor string.
- *
- * default c NULL, 0
- * param encoder An encoder instance to set.
- * param metadata See above.
- * param num_blocks See above.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * c false if the encoder is already initialized, else c true.
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks);
- /** Set the write callback.
- * The supplied function will be called by the encoder anytime there is raw
- * encoded data ready to write. It may include metadata mixed with encoded
- * audio frames and the data is not guaranteed to be aligned on frame or
- * metadata block boundaries.
- *
- * The only duty of the callback is to write out the a bytes worth of data
- * in a buffer to the current position in the output stream. The arguments
- * a samples and a current_frame are purely informational. If a samples
- * is greater than c 0, then a current_frame will hold the current frame
- * number that is being written; otherwise, the write callback is being called
- * to write metadata.
- *
- * note
- * The callback is mandatory and must be set before initialization.
- *
- * default c NULL
- * 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_API FLAC__bool FLAC__stream_encoder_set_write_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteCallback value);
- /** Set the metadata callback.
- * The supplied function will be called once at the end of encoding with
- * the populated STREAMINFO structure. This is so file encoders can seek
- * back to the beginning of the file and write the STREAMINFO block with
- * the correct statistics after encoding (like minimum/maximum frame size
- * and total samples).
- *
- * note
- * The callback is mandatory and must be set before initialization.
- *
- * default c NULL
- * 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_API FLAC__bool FLAC__stream_encoder_set_metadata_callback(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderMetadataCallback value);
- /** 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 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_API FLAC__bool FLAC__stream_encoder_set_client_data(FLAC__StreamEncoder *encoder, void *value);
- /** Get the current encoder state.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__StreamEncoderState
- * The current encoder state.
- */
- FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder);
- /** Get the state of the verify stream decoder.
- * Useful when the stream encoder state is
- * c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__StreamDecoderState
- * The verify stream decoder state.
- */
- FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder);
- /** Get the current encoder state as a C string.
- * This version automatically resolves
- * c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR by getting the
- * verify decoder's state.
- *
- * param encoder A encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval const char *
- * The encoder state as a C string. Do not modify the contents.
- */
- FLAC_API const char *FLAC__stream_encoder_get_resolved_state_string(const FLAC__StreamEncoder *encoder);
- /** Get relevant values about the nature of a verify decoder error.
- * Useful when the stream encoder state is
- * c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR. The arguments should
- * be addresses in which the stats will be returned, or NULL if value
- * is not desired.
- *
- * param encoder An encoder instance to query.
- * param absolute_sample The absolute sample number of the mismatch.
- * param frame_number The number of the frame in which the mismatch occurred.
- * param channel The channel in which the mismatch occurred.
- * param sample The number of the sample (relative to the frame) in
- * which the mismatch occurred.
- * param expected The expected value for the sample in question.
- * param got The actual value returned by the decoder.
- * assert
- * code encoder != NULL endcode
- */
- FLAC_API void FLAC__stream_encoder_get_verify_decoder_error_stats(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_sample, unsigned *frame_number, unsigned *channel, unsigned *sample, FLAC__int32 *expected, FLAC__int32 *got);
- /** Get the "verify" flag.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * See FLAC__stream_encoder_set_verify().
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder);
- /** Get the "streamable subset" flag.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * See FLAC__stream_encoder_set_streamable_subset().
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder);
- /** Get the "mid/side stereo coding" flag.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * See FLAC__stream_encoder_get_do_mid_side_stereo().
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder);
- /** Get the "adaptive mid/side switching" flag.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * See FLAC__stream_encoder_set_loose_mid_side_stereo().
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder);
- /** Get the number of input channels being processed.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_channels().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder);
- /** Get the input sample resolution setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_bits_per_sample().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder);
- /** Get the input sample rate setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_sample_rate().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder);
- /** Get the blocksize setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_blocksize().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder);
- /** Get the maximum LPC order setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_max_lpc_order().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder);
- /** Get the quantized linear predictor coefficient precision setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_qlp_coeff_precision().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder);
- /** Get the qlp coefficient precision search flag.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * See FLAC__stream_encoder_set_do_qlp_coeff_prec_search().
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder);
- /** Get the "escape coding" flag.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * See FLAC__stream_encoder_set_do_escape_coding().
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder);
- /** Get the exhaustive model search flag.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__bool
- * See FLAC__stream_encoder_set_do_exhaustive_model_search().
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder);
- /** Get the minimum residual partition order setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_min_residual_partition_order().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder);
- /** Get maximum residual partition order setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_max_residual_partition_order().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder);
- /** Get the Rice parameter search distance setting.
- *
- * param encoder An encoder instance to query.
- * assert
- * code encoder != NULL endcode
- * retval unsigned
- * See FLAC__stream_encoder_set_rice_parameter_search_dist().
- */
- FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder);
- /** Get the previously set estimate of the total samples to be encoded.
- * The encoder merely mimics back the value given to
- * FLAC__stream_encoder_set_total_samples_estimate() since it has no
- * other way of knowing how many samples the user will encode.
- *
- * param encoder An encoder instance to set.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__uint64
- * See FLAC__stream_encoder_get_total_samples_estimate().
- */
- FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder);
- /** Initialize the encoder instance.
- * Should be called after FLAC__stream_encoder_new() and
- * FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
- * or FLAC__stream_encoder_process_interleaved(). Will set and return
- * the encoder state, which will be FLAC__STREAM_ENCODER_OK if
- * initialization succeeded.
- *
- * The call to FLAC__stream_encoder_init() currently will also immediately
- * call the write callback several times, once with the c fLaC signature,
- * and once for each encoded metadata block.
- *
- * param encoder An uninitialized encoder instance.
- * assert
- * code encoder != NULL endcode
- * retval FLAC__StreamEncoderState
- * c FLAC__STREAM_ENCODER_OK if initialization was successful; see
- * FLAC__StreamEncoderState for the meanings of other return values.
- */
- FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder);
- /** Finish the encoding process.
- * Flushes the encoding buffer, releases resources, resets the encoder
- * settings to their defaults, and returns the encoder state to
- * FLAC__STREAM_ENCODER_UNINITIALIZED. Note that this can generate
- * one or more write callbacks before returning, and will generate
- * a metadata callback.
- *
- * In the event of a prematurely-terminated encode, it is not strictly
- * necessary to call this immediately before FLAC__stream_encoder_delete()
- * but it is good practice to match every FLAC__stream_encoder_init()
- * with a FLAC__stream_encoder_finish().
- *
- * param encoder An uninitialized encoder instance.
- * assert
- * code encoder != NULL endcode
- */
- FLAC_API void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder);
- /** Submit data for encoding.
- * This version allows you to supply the input data via an array of
- * pointers, each pointer pointing to an array of a samples samples
- * representing one channel. The samples need not be block-aligned,
- * but each channel should have the same number of samples.
- *
- * param encoder An initialized encoder instance in the OK state.
- * param buffer An array of pointers to each channel's signal.
- * param samples The number of samples in one channel.
- * assert
- * code encoder != NULL endcode
- * code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK endcode
- * retval FLAC__bool
- * c true if successful, else c false; in this case, check the
- * encoder state with FLAC__stream_encoder_get_state() to see what
- * went wrong.
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples);
- /** Submit data for encoding.
- * This version allows you to supply the input data where the channels
- * are interleaved into a single array (i.e. channel0_sample0,
- * channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
- * The samples need not be block-aligned but they must be
- * sample-aligned, i.e. the first value should be channel0_sample0
- * and the last value channelN_sampleM.
- *
- * param encoder An initialized encoder instance in the OK state.
- * param buffer An array of channel-interleaved data (see above).
- * param samples The number of samples in one channel, the same as for
- * FLAC__stream_encoder_process(). For example, if
- * encoding two channels, c 1000 a samples corresponds
- * to a a buffer of 2000 values.
- * assert
- * code encoder != NULL endcode
- * code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK endcode
- * retval FLAC__bool
- * c true if successful, else c false; in this case, check the
- * encoder state with FLAC__stream_encoder_get_state() to see what
- * went wrong.
- */
- FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples);
- /* } */
- #ifdef __cplusplus
- }
- #endif
- #endif