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/* libFLAC - Free Lossless Audio Codec library

 * Copyright (C) 2000-2009  Josh Coalson

 * Copyright (C) 2011-2016  Xiph.Org Foundation

 *

 * 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 <stdio.h> /* for FILE */

#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 encoder layers provided by libFLAC.

 *

 * The stream encoder can be used to encode complete streams either to the

 * client via callbacks, or directly to a file, depending on how it is

 * initialized.  When encoding via callbacks, the client provides a write

 * callback which will be called whenever FLAC data is ready to be written.

 * If the client also supplies a seek callback, the encoder will also

 * automatically handle the writing back of metadata discovered while

 * encoding, like stream info, seek points offsets, etc.  When encoding to

 * a file, the client needs only supply a filename or open \c FILE* and an

 * optional progress callback for periodic notification of progress; the

 * write and seek callbacks are supplied internally.  For more info see the

 * \link flac_stream_encoder stream encoder \endlink module.

 */

/** \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 stream encoder can encode to native FLAC, and optionally Ogg FLAC

 * (check FLAC_API_SUPPORTS_OGG_FLAC) streams and files.

 *

 * 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 using

 *   FLAC__stream_encoder_set_*() functions.  At a minimum, the following

 *   functions should be called:

 *   - FLAC__stream_encoder_set_channels()

 *   - FLAC__stream_encoder_set_bits_per_sample()

 *   - FLAC__stream_encoder_set_sample_rate()

 *   - FLAC__stream_encoder_set_ogg_serial_number() (if encoding to Ogg FLAC)

 *   - FLAC__stream_encoder_set_total_samples_estimate() (if known)

 * - If the application wants to control the compression level or set its own

 *   metadata, then the following should also be called:

 *   - FLAC__stream_encoder_set_compression_level()

 *   - FLAC__stream_encoder_set_verify()

 *   - FLAC__stream_encoder_set_metadata()

 * - The rest of the set functions should only be called if the client needs

 *   exact control over how the audio is compressed; thorough understanding

 *   of the FLAC format is necessary to achieve good results.

 * - The program initializes the instance to validate the settings and

 *   prepare for encoding using

 *   - FLAC__stream_encoder_init_stream() or FLAC__stream_encoder_init_FILE()

 *     or FLAC__stream_encoder_init_file() for native FLAC

 *   - FLAC__stream_encoder_init_ogg_stream() or FLAC__stream_encoder_init_ogg_FILE()

 *     or FLAC__stream_encoder_init_ogg_file() for Ogg FLAC

 * - 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,

 *   update the metadata with the final encoding statistics if output

 *   seeking is possible, 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 client will create a new

 * instance by calling FLAC__stream_encoder_new(), then set the necessary

 * parameters with FLAC__stream_encoder_set_*(), and initialize it by

 * calling one of the FLAC__stream_encoder_init_*() functions.

 *

 * 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_format_overview.html">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_*()

 * functions 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_INIT_STATUS_OK.  Any parameters that are not set

 * before FLAC__stream_encoder_init_*() will take on the defaults from

 * the constructor.

 *

 * There are three initialization functions for native FLAC, one for

 * setting up the encoder to encode FLAC data to the client via

 * callbacks, and two for encoding directly to a file.

 *

 * For encoding via callbacks, use FLAC__stream_encoder_init_stream().

 * You must also supply a write callback which will be called anytime

 * there is raw encoded data to write.  If the client can seek the output

 * it is best to also supply seek and tell callbacks, as this allows the

 * encoder to go back after encoding is finished to write back

 * information that was collected while encoding, like seek point offsets,

 * frame sizes, etc.

 *

 * For encoding directly to a file, use FLAC__stream_encoder_init_FILE()

 * or FLAC__stream_encoder_init_file().  Then you must only supply a

 * filename or open \c FILE*; the encoder will handle all the callbacks

 * internally.  You may also supply a progress callback for periodic

 * notification of the encoding progress.

 *

 * There are three similarly-named init functions for encoding to Ogg

 * FLAC streams.  Check \c FLAC_API_SUPPORTS_OGG_FLAC to find out if the

 * library has been built with Ogg support.

 *

 * 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.  Note that for Ogg FLAC

 * encoding you will usually get at least twice the number of callbacks than

 * with native FLAC, one for the Ogg page header and one for the page body.

 *

 * After initializing the instance, the client may feed audio data to the

 * encoder in one of two ways:

 *

 * - Channel separate, through FLAC__stream_encoder_process() - The client

 *   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, but each channel should have the same number of samples.

 * - Channel interleaved, through

 *   FLAC__stream_encoder_process_interleaved() - The client 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.

 *

 * Note that for either process call, each sample in the buffers should be a

 * signed integer, right-justified to the resolution set by

 * FLAC__stream_encoder_set_bits_per_sample().  For example, if the resolution

 * is 16 bits per sample, the samples should all be in the range [-32768,32767].

 *

 * When the client 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

 * If you are writing the FLAC data to a file via callbacks, make sure it

 * is open for update (e.g. mode "w+" for stdio streams).  This is because

 * after the first encoding pass, the encoder will try to seek back to the

 * beginning of the stream, to the STREAMINFO block, to write some data

 * there.  (If using FLAC__stream_encoder_init*_file() or

 * FLAC__stream_encoder_init*_FILE(), the file is managed internally.)

 *

 * \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.

 *

 * \{

 */

/** State values for a FLAC__StreamEncoder.

 *

 * The encoder's state can be obtained by calling FLAC__stream_encoder_get_state().

 *

 * If the encoder gets into any other state besides \c FLAC__STREAM_ENCODER_OK

 * or \c FLAC__STREAM_ENCODER_UNINITIALIZED, it becomes invalid for encoding and

 * must be deleted with FLAC__stream_encoder_delete().

 */

typedef enum {

        FLAC__STREAM_ENCODER_OK = 0,

        /**< The encoder is in the normal OK state and samples can be processed. */

        FLAC__STREAM_ENCODER_UNINITIALIZED,

        /**< The encoder is in the uninitialized state; one of the

         * FLAC__stream_encoder_init_*() functions must be called before samples

         * can be processed.

         */

        FLAC__STREAM_ENCODER_OGG_ERROR,

        /**< An error occurred in the underlying Ogg layer.  */

        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_CLIENT_ERROR,

        /**< One of the callbacks returned a fatal error. */

        FLAC__STREAM_ENCODER_IO_ERROR,

        /**< An I/O error occurred while opening/reading/writing a file.

         * Check \c errno.

         */

        FLAC__STREAM_ENCODER_FRAMING_ERROR,

        /**< An error occurred while writing the stream; usually, the

         * write_callback returned an error.

         */

        FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR

        /**< Memory allocation failed. */

} 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[];

/** Possible return values for the FLAC__stream_encoder_init_*() functions.

 */

typedef enum {

        FLAC__STREAM_ENCODER_INIT_STATUS_OK = 0,

        /**< Initialization was successful. */

        FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR,

        /**< General failure to set up encoder; call FLAC__stream_encoder_get_state() for cause. */

        FLAC__STREAM_ENCODER_INIT_STATUS_UNSUPPORTED_CONTAINER,

        /**< The library was not compiled with support for the given container

         * format.

         */

        FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS,

        /**< A required callback was not supplied. */

        FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS,

        /**< The encoder has an invalid setting for number of channels. */

        FLAC__STREAM_ENCODER_INIT_STATUS_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_INIT_STATUS_INVALID_SAMPLE_RATE,

        /**< The encoder has an invalid setting for the input sample rate. */

        FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE,

        /**< The encoder has an invalid setting for the block size. */

        FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER,

        /**< The encoder has an invalid setting for the maximum LPC order. */

        FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION,

        /**< The encoder has an invalid setting for the precision of the quantized linear predictor coefficients. */

        FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER,

        /**< The specified block size is less than the maximum LPC order. */

        FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE,

        /**< The encoder is bound to the <A HREF="../format.html#subset">Subset</A> but other settings violate it. */

        FLAC__STREAM_ENCODER_INIT_STATUS_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_INIT_STATUS_ALREADY_INITIALIZED

        /**< FLAC__stream_encoder_init_*() was called when the encoder was

         * already initialized, usually because

         * FLAC__stream_encoder_finish() was not called.

         */

} FLAC__StreamEncoderInitStatus;

/** Maps a FLAC__StreamEncoderInitStatus to a C string.

 *

 *  Using a FLAC__StreamEncoderInitStatus as the index to this array

 *  will give the string equivalent.  The contents should not be modified.

 */

extern FLAC_API const char * const FLAC__StreamEncoderInitStatusString[];

/** Return values for the FLAC__StreamEncoder read callback.

 */

typedef enum {

        FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE,

        /**< The read was OK and decoding can continue. */

        FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM,

        /**< The read was attempted at the end of the stream. */

        FLAC__STREAM_ENCODER_READ_STATUS_ABORT,

        /**< An unrecoverable error occurred. */

        FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED

        /**< Client does not support reading back from the output. */

} FLAC__StreamEncoderReadStatus;

/** Maps a FLAC__StreamEncoderReadStatus to a C string.

 *

 *  Using a FLAC__StreamEncoderReadStatus as the index to this array

 *  will give the string equivalent.  The contents should not be modified.

 */

extern FLAC_API const char * const FLAC__StreamEncoderReadStatusString[];

/** 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[];

/** Return values for the FLAC__StreamEncoder seek callback.

 */

typedef enum {

        FLAC__STREAM_ENCODER_SEEK_STATUS_OK,

        /**< The seek was OK and encoding can continue. */

        FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR,

        /**< An unrecoverable error occurred. */

        FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED

        /**< Client does not support seeking. */

} FLAC__StreamEncoderSeekStatus;

/** Maps a FLAC__StreamEncoderSeekStatus to a C string.

 *

 *  Using a FLAC__StreamEncoderSeekStatus as the index to this array

 *  will give the string equivalent.  The contents should not be modified.

 */

extern FLAC_API const char * const FLAC__StreamEncoderSeekStatusString[];

/** Return values for the FLAC__StreamEncoder tell callback.

 */

typedef enum {

        FLAC__STREAM_ENCODER_TELL_STATUS_OK,

        /**< The tell was OK and encoding can continue. */

        FLAC__STREAM_ENCODER_TELL_STATUS_ERROR,

        /**< An unrecoverable error occurred. */

        FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED

        /**< Client does not support seeking. */

} FLAC__StreamEncoderTellStatus;

/** Maps a FLAC__StreamEncoderTellStatus to a C string.

 *

 *  Using a FLAC__StreamEncoderTellStatus as the index to this array

 *  will give the string equivalent.  The contents should not be modified.

 */

extern FLAC_API const char * const FLAC__StreamEncoderTellStatusString[];

/***********************************************************************

 *

 * 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 read callback.

 *

 *  A function pointer matching this signature must be passed to

 *  FLAC__stream_encoder_init_ogg_stream() if seeking is supported.

 *  The supplied function will be called when the encoder needs to read back

 *  encoded data.  This happens during the metadata callback, when the encoder

 *  has to read, modify, and rewrite the metadata (e.g. seekpoints) gathered

 *  while encoding.  The address of the buffer to be filled is supplied, along

 *  with the number of bytes the buffer can hold.  The callback may choose to

 *  supply less data and modify the byte count but must be careful not to

 *  overflow the buffer.  The callback then returns a status code chosen from

 *  FLAC__StreamEncoderReadStatus.

 *

 * Here is an example of a read callback for stdio streams:

 * \code

 * FLAC__StreamEncoderReadStatus read_cb(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data)

 * {

 *   FILE *file = ((MyClientData*)client_data)->file;

 *   if(*bytes > 0) {

 *     *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, file);

 *     if(ferror(file))

 *       return FLAC__STREAM_ENCODER_READ_STATUS_ABORT;

 *     else if(*bytes == 0)

 *       return FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM;

 *     else

 *       return FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE;

 *   }

 *   else

 *     return FLAC__STREAM_ENCODER_READ_STATUS_ABORT;

 * }

 * \endcode

 *

 * \note In general, FLAC__StreamEncoder functions which change the

 * state should not be called on the \a encoder while in the callback.

 *

 * \param  encoder  The encoder instance calling the callback.

 * \param  buffer   A pointer to a location for the callee to store

 *                  data to be encoded.

 * \param  bytes    A pointer to the size of the buffer.  On entry

 *                  to the callback, it contains the maximum number

 *                  of bytes that may be stored in \a buffer.  The

 *                  callee must set it to the actual number of bytes

 *                  stored (0 in case of error or end-of-stream) before

 *                  returning.

 * \param  client_data  The callee's client data set through

 *                      FLAC__stream_encoder_set_client_data().

 * \retval FLAC__StreamEncoderReadStatus

 *    The callee's return status.

 */

typedef FLAC__StreamEncoderReadStatus (*FLAC__StreamEncoderReadCallback)(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data);

/** Signature for the write callback.

 *

 *  A function pointer matching this signature must be passed to

 *  FLAC__stream_encoder_init*_stream().  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 it indicates that the write

 *  callback is being called to write metadata.

 *

 * \note

 * Unlike when writing to native FLAC, when writing to Ogg FLAC the

 * write callback will be called twice when writing each audio

 * frame; once for the page header, and once for the page body.

 * When writing the page header, the \a samples argument to the

 * write callback will be \c 0.

 *

 * \note In general, FLAC__StreamEncoder functions which change the

 * state should not be called on the \a encoder while in the callback.

 *

 * \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 above.

 * \param  current_frame  The number of the current frame being encoded.

 * \param  client_data  The callee's client data set through

 *                      FLAC__stream_encoder_init_*().

 * \retval FLAC__StreamEncoderWriteStatus

 *    The callee's return status.

 */

typedef FLAC__StreamEncoderWriteStatus (*FLAC__StreamEncoderWriteCallback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data);

/** Signature for the seek callback.

 *

 *  A function pointer matching this signature may be passed to

 *  FLAC__stream_encoder_init*_stream().  The supplied function will be called

 *  when the encoder needs to seek the output stream.  The encoder will pass

 *  the absolute byte offset to seek to, 0 meaning the beginning of the stream.

 *

 * Here is an example of a seek callback for stdio streams:

 * \code

 * FLAC__StreamEncoderSeekStatus seek_cb(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data)

 * {

 *   FILE *file = ((MyClientData*)client_data)->file;

 *   if(file == stdin)

 *     return FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED;

 *   else if(fseeko(file, (off_t)absolute_byte_offset, SEEK_SET) < 0)

 *     return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR;

 *   else

 *     return FLAC__STREAM_ENCODER_SEEK_STATUS_OK;

 * }

 * \endcode

 *

 * \note In general, FLAC__StreamEncoder functions which change the

 * state should not be called on the \a encoder while in the callback.

 *

 * \param  encoder  The encoder instance calling the callback.

 * \param  absolute_byte_offset  The offset from the beginning of the stream

 *                               to seek to.

 * \param  client_data  The callee's client data set through

 *                      FLAC__stream_encoder_init_*().

 * \retval FLAC__StreamEncoderSeekStatus

 *    The callee's return status.

 */

typedef FLAC__StreamEncoderSeekStatus (*FLAC__StreamEncoderSeekCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data);

/** Signature for the tell callback.

 *

 *  A function pointer matching this signature may be passed to

 *  FLAC__stream_encoder_init*_stream().  The supplied function will be called

 *  when the encoder needs to know the current position of the output stream.

 *

 * \warning

 * The callback must return the true current byte offset of the output to

 * which the encoder is writing.  If you are buffering the output, make

 * sure and take this into account.  If you are writing directly to a

 * FILE* from your write callback, ftell() is sufficient.  If you are

 * writing directly to a file descriptor from your write callback, you

 * can use lseek(fd, SEEK_CUR, 0).  The encoder may later seek back to

 * these points to rewrite metadata after encoding.

 *

 * Here is an example of a tell callback for stdio streams:

 * \code

 * FLAC__StreamEncoderTellStatus tell_cb(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data)

 * {

 *   FILE *file = ((MyClientData*)client_data)->file;

 *   off_t pos;

 *   if(file == stdin)

 *     return FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED;

 *   else if((pos = ftello(file)) < 0)

 *     return FLAC__STREAM_ENCODER_TELL_STATUS_ERROR;

 *   else {

 *     *absolute_byte_offset = (FLAC__uint64)pos;

 *     return FLAC__STREAM_ENCODER_TELL_STATUS_OK;

 *   }

 * }

 * \endcode

 *

 * \note In general, FLAC__StreamEncoder functions which change the

 * state should not be called on the \a encoder while in the callback.

 *

 * \param  encoder  The encoder instance calling the callback.

 * \param  absolute_byte_offset  The address at which to store the current

 *                               position of the output.

 * \param  client_data  The callee's client data set through

 *                      FLAC__stream_encoder_init_*().

 * \retval FLAC__StreamEncoderTellStatus

 *    The callee's return status.

 */

typedef FLAC__StreamEncoderTellStatus (*FLAC__StreamEncoderTellCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data);

/** Signature for the metadata callback.

 *

 *  A function pointer matching this signature may be passed to

 *  FLAC__stream_encoder_init*_stream().  The supplied function will be called

 *  once at the end of encoding with the populated STREAMINFO structure.  This

 *  is so the client 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 In general, FLAC__StreamEncoder functions which change the

 * state should not be called on the \a encoder while in the callback.

 *

 * \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_init_*().

 */

typedef void (*FLAC__StreamEncoderMetadataCallback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data);

/** Signature for the progress callback.

 *

 *  A function pointer matching this signature may be passed to

 *  FLAC__stream_encoder_init*_file() or FLAC__stream_encoder_init*_FILE().

 *  The supplied function will be called when the encoder has finished

 *  writing a frame.  The \c total_frames_estimate argument to the

 *  callback will be based on the value from

 *  FLAC__stream_encoder_set_total_samples_estimate().

 *

 * \note In general, FLAC__StreamEncoder functions which change the

 * state should not be called on the \a encoder while in the callback.

 *

 * \param  encoder          The encoder instance calling the callback.

 * \param  bytes_written    Bytes written so far.

 * \param  samples_written  Samples written so far.

 * \param  frames_written   Frames written so far.

 * \param  total_frames_estimate  The estimate of the total number of

 *                                frames to be written.

 * \param  client_data      The callee's client data set through

 *                          FLAC__stream_encoder_init_*().

 */

typedef void (*FLAC__StreamEncoderProgressCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate, 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(void);

/** 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 serial number for the FLAC stream to use in the Ogg container.

 *

 * \note

 * This does not need to be set for native FLAC encoding.

 *

 * \note

 * It is recommended to set a serial number explicitly as the default of '0'

 * may collide with other streams.

 *

 * \default \c 0

 * \param  encoder        An encoder instance to set.

 * \param  serial_number  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_ogg_serial_number(FLAC__StreamEncoder *encoder, long serial_number);

/** 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 <A HREF="../format.html#subset">Subset</A> flag.  If \c true,

 *  the encoder will comply with the Subset 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 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 compression level

 *

 * The compression level is roughly proportional to the amount of effort

 * the encoder expends to compress the file.  A higher level usually

 * means more computation but higher compression.  The default level is

 * suitable for most applications.

 *

 * Currently the levels range from \c 0 (fastest, least compression) to

 * \c 8 (slowest, most compression).  A value larger than \c 8 will be

 * treated as \c 8.

 *

 * This function automatically calls the following other \c _set_

 * functions with appropriate values, so the client does not need to

 * unless it specifically wants to override them:

 * - FLAC__stream_encoder_set_do_mid_side_stereo()

 * - FLAC__stream_encoder_set_loose_mid_side_stereo()

 * - FLAC__stream_encoder_set_apodization()

 * - FLAC__stream_encoder_set_max_lpc_order()

 * - FLAC__stream_encoder_set_qlp_coeff_precision()

 * - FLAC__stream_encoder_set_do_qlp_coeff_prec_search()

 * - FLAC__stream_encoder_set_do_escape_coding()

 * - FLAC__stream_encoder_set_do_exhaustive_model_search()

 * - FLAC__stream_encoder_set_min_residual_partition_order()

 * - FLAC__stream_encoder_set_max_residual_partition_order()

 * - FLAC__stream_encoder_set_rice_parameter_search_dist()

 *

 * The actual values set for each level are:

 * <table>

 * <tr>

 *  <td><b>level</b></td>

 *  <td>do mid-side stereo</td>

 *  <td>loose mid-side stereo</td>

 *  <td>apodization</td>

 *  <td>max lpc order</td>

 *  <td>qlp coeff precision</td>

 *  <td>qlp coeff prec search</td>

 *  <td>escape coding</td>

 *  <td>exhaustive model search</td>

 *  <td>min residual partition order</td>

 *  <td>max residual partition order</td>

 *  <td>rice parameter search dist</td>

 * </tr>

 * <tr>  <td><b>0</b></td> <td>false</td> <td>false</td> <td>tukey(0.5)<td>                                     <td>0</td>  <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>3</td> <td>0</td> </tr>

 * <tr>  <td><b>1</b></td> <td>true</td>  <td>true</td>  <td>tukey(0.5)<td>                                     <td>0</td>  <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>3</td> <td>0</td> </tr>

 * <tr>  <td><b>2</b></td> <td>true</td>  <td>false</td> <td>tukey(0.5)<td>                                     <td>0</td>  <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>3</td> <td>0</td> </tr>

 * <tr>  <td><b>3</b></td> <td>false</td> <td>false</td> <td>tukey(0.5)<td>                                     <td>6</td>  <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>4</td> <td>0</td> </tr>

 * <tr>  <td><b>4</b></td> <td>true</td>  <td>true</td>  <td>tukey(0.5)<td>                                     <td>8</td>  <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>4</td> <td>0</td> </tr>

 * <tr>  <td><b>5</b></td> <td>true</td>  <td>false</td> <td>tukey(0.5)<td>                                     <td>8</td>  <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>5</td> <td>0</td> </tr>

 * <tr>  <td><b>6</b></td> <td>true</td>  <td>false</td> <td>tukey(0.5);partial_tukey(2)<td>                    <td>8</td>  <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>6</td> <td>0</td> </tr>

 * <tr>  <td><b>7</b></td> <td>true</td>  <td>false</td> <td>tukey(0.5);partial_tukey(2)<td>                    <td>12</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>6</td> <td>0</td> </tr>

 * <tr>  <td><b>8</b></td> <td>true</td>  <td>false</td> <td>tukey(0.5);partial_tukey(2);punchout_tukey(3)</td> <td>12</td> <td>0</td> <td>false</td> <td>false</td> <td>false</td> <td>0</td> <td>6</td> <td>0</td> </tr>

 * </table>

 *

 * \default \c 5

 * \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_compression_level(FLAC__StreamEncoder *encoder, unsigned value);

/** Set the blocksize to use while encoding.

 *

 * The number of samples to use per frame.  Use \c 0 to let the encoder

 * estimate a blocksize; this is usually 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_blocksize(FLAC__StreamEncoder *encoder, unsigned value);

/** Set to \c true to enable mid-side encoding on stereo input.  The

 *  number of channels must be 2 for this to have any effect.  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.  Set to \c false to use

 *  exhaustive searching.  Setting this to \c true requires

 *  FLAC__stream_encoder_set_do_mid_side_stereo() to also be set to

 *  \c true in order to have any effect.

 *

 * \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);

/** Sets the apodization function(s) the encoder will use when windowing

 *  audio data for LPC analysis.

 *

 * The \a specification is a plain ASCII string which specifies exactly

 * which functions to use.  There may be more than one (up to 32),

 * separated by \c ';' characters.  Some functions take one or more

 * comma-separated arguments in parentheses.

 *

 * The available functions are \c bartlett, \c bartlett_hann,

 * \c blackman, \c blackman_harris_4term_92db, \c connes, \c flattop,

 * \c gauss(STDDEV), \c hamming, \c hann, \c kaiser_bessel, \c nuttall,

 * \c rectangle, \c triangle, \c tukey(P), \c partial_tukey(n[/ov[/P]]),

 * \c punchout_tukey(n[/ov[/P]]), \c welch.

 *

 * For \c gauss(STDDEV), STDDEV specifies the standard deviation

 * (0<STDDEV<=0.5).

 *

 * For \c tukey(P), P specifies the fraction of the window that is

 * tapered (0<=P<=1).  P=0 corresponds to \c rectangle and P=1

 * corresponds to \c hann.

 *

 * Specifying \c partial_tukey or \c punchout_tukey works a little

 * different. These do not specify a single apodization function, but

 * a series of them with some overlap. partial_tukey specifies a series

 * of small windows (all treated separately) while punchout_tukey

 * specifies a series of windows that have a hole in them. In this way,

 * the predictor is constructed with only a part of the block, which

 * helps in case a block consists of dissimilar parts.

 *

 * The three parameters that can be specified for the functions are

 * n, ov and P. n is the number of functions to add, ov is the overlap

 * of the windows in case of partial_tukey and the overlap in the gaps

 * in case of punchout_tukey. P is the fraction of the window that is

 * tapered, like with a regular tukey window. The function can be

 * specified with only a number, a number and an overlap, or a number

 * an overlap and a P, for example, partial_tukey(3), partial_tukey(3/0.3)

 * and partial_tukey(3/0.3/0.5) are all valid. ov should be smaller than 1

 * and can be negative.

 *

 * Example specifications are \c "blackman" or

 * \c "hann;triangle;tukey(0.5);tukey(0.25);tukey(0.125)"

 *

 * Any function that is specified erroneously is silently dropped.  Up

 * to 32 functions are kept, the rest are dropped.  If the specification

 * is empty the encoder defaults to \c "tukey(0.5)".

 *

 * When more than one function is specified, then for every subframe the

 * encoder will try each of them separately and choose the window that

 * results in the smallest compressed subframe.

 *

 * Note that each function specified causes the encoder to occupy a

 * floating point array in which to store the window. Also note that the

 * values of P, STDDEV and ov are locale-specific, so if the comma

 * separator specified by the locale is a comma, a comma should be used.

 *

 * \default \c "tukey(0.5)"

 * \param  encoder        An encoder instance to set.

 * \param  specification  See above.

 * \assert

 *    \code encoder != NULL \endcode

 *    \code specification != NULL \endcode

 * \retval FLAC__bool

 *    \c false if the encoder is already initialized, else \c true.

 */

FLAC_API FLAC__bool FLAC__stream_encoder_set_apodization(FLAC__StreamEncoder *encoder, const char *specification);

/** Set the maximum LPC order, or \c 0 to use only the fixed predictors.

 *