564 lines
21 KiB
C
564 lines
21 KiB
C
/* libFLAC - Free Lossless Audio Codec library
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* Copyright (C) 2000,2001,2002 Josh Coalson
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef FLAC__STREAM_ENCODER_H
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#define FLAC__STREAM_ENCODER_H
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#include "format.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \file include/FLAC/stream_encoder.h
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*
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* \brief
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* This module contains the functions which implement the stream
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* encoder.
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*
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* See the detailed documentation in the
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* \link flac_stream_encoder stream encoder \endlink module.
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*/
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/** \defgroup flac_stream_encoder FLAC/stream_encoder.h: stream encoder interface
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* \ingroup flac
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*
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* \brief
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* This module contains the functions which implement the stream
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* encoder.
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*
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* The basic usage of a libFLAC encoder is as follows:
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* - The program creates an instance of an encoder using
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* FLAC__stream_encoder_new().
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* - The program overrides the default settings and sets callbacks for
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* reading, writing, error reporting, and metadata reporting using
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* FLAC__stream_encoder_set_*() functions.
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* - The program initializes the instance to validate the settings and
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* prepare for encoding using FLAC__stream_encoder_init().
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* - The program calls FLAC__stream_encoder_process() or
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* FLAC__stream_encoder_process_interleaved() to encode data, which
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* subsequently calls the callbacks.
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* - The program finishes the instance with FLAC__stream_encoder_finish(),
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* which flushes the input and output and resets the encoder to the
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* unitialized state.
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* - The instance may be used again or deleted with
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* FLAC__stream_encoder_delete().
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*
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* \note
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* The "set" functions may only be called when the encoder is in the
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* state FLAC__STREAM_ENCODER_UNINITIALIZED, i.e. after
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* FLAC__stream_encoder_new() or FLAC__stream_encoder_finish(), but
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* before FLAC__stream_encoder_init(). If this is the case they will
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* return true, otherwise false.
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*
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* \note
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* The "set" functions do not validate the values as many are
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* interdependent. The FLAC__stream_encoder_init() function will do
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* this, so make sure to pay attention to the state returned by
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* FLAC__stream_encoder_init() to make sure that it is
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* FLAC__STREAM_ENCODER_OK.
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*
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* \note
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* Unlike the decoders, the stream encoder has many options that can
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* affect the speed and compression ratio. When setting these parameters
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* you should have some basic knowledge of the format (see the
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* <A HREF="../documentation.html#format">user-level documentation</A>
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* or the <A HREF="../format.html">formal description</A>).
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*
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* \note
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* Any parameters that are not set before FLAC__stream_encoder_init()
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* will take on the defaults from the constructor.
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*
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* \note
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* FLAC__stream_encoder_finish() resets all settings to the constructor
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* defaults, including the callbacks.
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*
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* \{
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*/
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/** State values for a FLAC__StreamEncoder
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*
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* The encoder's state can be obtained by calling FLAC__stream_encoder_get_state().
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*/
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typedef enum {
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FLAC__STREAM_ENCODER_OK = 0,
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/**< The encoder is in the normal OK state. */
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FLAC__STREAM_ENCODER_INVALID_CALLBACK,
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/**< The encoder was initialized before setting all the required callbacks. */
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FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS,
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/**< The encoder has an invalid setting for number of channels. */
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FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE,
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/**< The encoder has an invalid setting for bits-per-sample.
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* FLAC supports 4-32 bps but the reference encoder currently supports
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* only up to 24 bps.
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*/
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FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE,
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/**< The encoder has an invalid setting for the input sample rate. */
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FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE,
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/**< The encoder has an invalid setting for the block size. */
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FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION,
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/**< The encoder has an invalid setting for the precision of the quantized linear predictor coefficients. */
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FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH,
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/**< Mid/side coding was specified but the number of channels is not equal to 2. */
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FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH,
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/**< Deprecated. */
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FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE,
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/**< Loose mid/side coding was specified but mid/side coding was not. */
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FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER,
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/**< The specified block size is less than the maximum LPC order. */
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FLAC__STREAM_ENCODER_NOT_STREAMABLE,
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/**< The encoder is bound to the "streamable subset" but other settings violate it. */
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FLAC__STREAM_ENCODER_FRAMING_ERROR,
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/**< An error occurred while writing the stream; usually, the write_callback returned an error. */
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FLAC__STREAM_ENCODER_INVALID_METADATA,
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/**< The metadata input to the encoder is invalid. */
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FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING,
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/**< An error occurred while writing the stream; usually, the write_callback returned an error. */
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FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING,
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/**< The write_callback returned an error. */
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FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR,
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/**< Memory allocation failed. */
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FLAC__STREAM_ENCODER_ALREADY_INITIALIZED,
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/**< FLAC__stream_encoder_init() was called when the encoder was
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* already initialized, usually because
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* FLAC__stream_encoder_finish() was not called.
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*/
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FLAC__STREAM_ENCODER_UNINITIALIZED
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/**< The encoder is in the uninitialized state. */
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} FLAC__StreamEncoderState;
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/** Maps a FLAC__StreamEncoderState to a C string.
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*
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* Using a FLAC__StreamEncoderState as the index to this array
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* will give the string equivalent. The contents should not be modified.
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*/
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extern const char * const FLAC__StreamEncoderStateString[];
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/** Return values for the FLAC__StreamEncoder write callback.
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*/
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typedef enum {
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FLAC__STREAM_ENCODER_WRITE_OK = 0,
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/**< The write was OK and encoding can continue. */
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FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR
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/**< An unrecoverable error occurred. The encoder will return from the process call. */
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} FLAC__StreamEncoderWriteStatus;
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/** Maps a FLAC__StreamEncoderWriteStatus to a C string.
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*
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* Using a FLAC__StreamEncoderWriteStatus as the index to this array
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* will give the string equivalent. The contents should not be modified.
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*/
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extern const char * const FLAC__StreamEncoderWriteStatusString[];
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/***********************************************************************
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*
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* class FLAC__StreamEncoder
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*
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***********************************************************************/
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struct FLAC__StreamEncoderProtected;
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struct FLAC__StreamEncoderPrivate;
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/** The opaque structure definition for the stream encoder type.
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*/
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typedef struct {
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struct FLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
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struct FLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
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} FLAC__StreamEncoder;
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/***********************************************************************
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*
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* Class constructor/destructor
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*
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***********************************************************************/
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/** Create a new stream encoder instance. The instance is created with
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* default settings; see the individual FLAC__stream_encoder_set_*()
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* functions for each setting's default.
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*
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* \retval FLAC__StreamEncoder*
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* \c NULL if there was an error allocating memory, else the new instance.
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*/
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FLAC__StreamEncoder *FLAC__stream_encoder_new();
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/** Free an encoder instance. Deletes the object pointed to by \a encoder.
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*
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* \param encoder A pointer to an existing encoder.
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* \assert
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* \code encoder != NULL \endcode
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*/
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void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder);
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/***********************************************************************
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*
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* Public class method prototypes
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*
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***********************************************************************/
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/*
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* FLAC__bool do_qlp_coeff_prec_search (DEFAULT: false ) false => use qlp_coeff_precision, true => search around qlp_coeff_precision, take best
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* FLAC__bool do_escape_coding (DEFAULT: false ) true => search for escape codes in the entropy coding stage for slightly better compression
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* FLAC__bool do_exhaustive_model_search (DEFAULT: false ) false => use estimated bits per residual for scoring, true => generate all, take shortest
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* unsigned min_residual_partition_order (DEFAULT: 0 ) 0 => estimate Rice parameter based on residual variance; >0 => partition residual, use parameter
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* unsigned max_residual_partition_order (DEFAULT: 0 ) for each based on mean; min_ and max_ specify the min and max Rice partition order
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* unsigned rice_parameter_search_dist (DEFAULT: 0 ) 0 => try only calc'd parameter k; else try all [k-dist..k+dist] parameters, use best
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* 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
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* FLAC__StreamMetadata **metadata (DEFAULT: NULL,0) optional metadata blocks to prepend. STREAMINFO is not allowed since it is done internally.
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* + unsigned num_blocks
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* void* client_data (DEFAULT: NULL ) passed back through the callbacks
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*/
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/** Set the "streamable subset" flag. If \c true, the encoder will comply
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* with the subset (see the format specification) and will check the
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* settings during FLAC__stream_encoder_init() to see if all settings
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* comply. If \c false, the settings may take advantage of the full
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* range that the format allows.
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*
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* Make sure you know what it entails before setting this to \c false.
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*
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* \default \c true
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* \param encoder An encoder instance to set.
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* \param value Flag value (see above).
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value);
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/** Set to \c true to enable mid-side encoding on stereo input. The
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* number of channels must be 2. Set to \c false to use only
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* independent channel coding.
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*
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* \default \c false
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* \param encoder An encoder instance to set.
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* \param value Flag value (see above).
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
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/** Set to \c true to enable adaptive switching between mid-side and
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* left-right encoding on stereo input. The number of channels must
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* be 2. Set to \c false to use exhaustive searching. In either
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* case, the mid/side stereo setting must be \c true.
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*
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* \default \c false
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* \param encoder An encoder instance to set.
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* \param value Flag value (see above).
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);
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/** Set the number of channels to be encoded.
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*
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* \default \c 2
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the sample resolution of the input to be encoded.
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*
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* \warning
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* Do not feed the encoder data that is wider than the value you
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* set here or you will generate an invalid stream.
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*
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* \default \c 16
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the sample rate (in Hz) of the input to be encoded.
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*
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* \default \c 44100
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the blocksize to use while encoding.
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*
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* \default \c 1152
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the maximum LPC order, or \c 0 to use only the fixed predictors.
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*
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* \default \c 0
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the precision, in bits, of the quantized linear predictor
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* coefficients, or \c 0 to let the encoder select it based on the
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* blocksize.
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*
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* \note
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* In the current implementation, qlp_coeff_precision + bits_per_sample must
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* be less than 32.
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*
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* \default \c 0
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the number of channels to be encoded.
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*
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* \default \c false
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
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/** Set the number of channels to be encoded.
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*
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* \default \c false
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value);
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/** Set the number of channels to be encoded.
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*
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* \default \c false
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value);
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/** Set the number of channels to be encoded.
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*
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* \default \c 0
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the number of channels to be encoded.
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*
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* \default \c 0
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the number of channels to be encoded.
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*
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* \default \c 0
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value);
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/** Set the number of channels to be encoded.
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*
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* \default \c 0
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value);
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/** Set the number of channels to be encoded.
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*
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* \default \c NULL, 0
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks);
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/** Set the number of channels to be encoded.
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*
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* \default \c NULL; the callback is mandatory and must be set before initialization
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
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* \code encoder != NULL \endcode
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* \code value != NULL \endcode
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* \retval FLAC__bool
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* \c false if the encoder is already initialized, else \c true.
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*/
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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));
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|
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/** Set the number of channels to be encoded.
|
|
*
|
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* \default \c NULL; the callback is mandatory and must be set before initialization
|
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* \param encoder An encoder instance to set.
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* \param value See above.
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* \assert
|
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* \code encoder != NULL \endcode
|
|
* \code value != NULL \endcode
|
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* \retval FLAC__bool
|
|
* \c false if the encoder is already initialized, else \c true.
|
|
*/
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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);
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|
|
|
/*
|
|
* Various "get" methods
|
|
*/
|
|
FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder);
|
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FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder);
|
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FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder);
|
|
FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder);
|
|
FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder);
|
|
FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder);
|
|
FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder);
|
|
unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder);
|
|
|
|
/*
|
|
* Initialize the instance; should be called after construction and
|
|
* 'set' calls but before any of the 'process' calls. Will set and
|
|
* return the encoder state, which will be FLAC__STREAM_ENCODER_OK
|
|
* if initialization succeeded.
|
|
*/
|
|
FLAC__StreamEncoderState FLAC__stream_encoder_init(FLAC__StreamEncoder *encoder);
|
|
|
|
/*
|
|
* Flush the encoding buffer, release resources, and return the encoder
|
|
* state to FLAC__STREAM_ENCODER_UNINITIALIZED. Note that this can
|
|
* generate one or more write_callback()s before returning.
|
|
*/
|
|
void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder);
|
|
|
|
/*
|
|
* Methods for encoding the data
|
|
*/
|
|
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
|
|
|
|
#endif
|