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132 lines
5.3 KiB
C
132 lines
5.3 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Copyright (c) 2008 Gregory Maxwell
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Written by Jean-Marc Valin and Gregory Maxwell */
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/**
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@file celt.h
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@brief Contains all the functions for encoding and decoding audio
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* this is a custom celt.h based on libcelt's, only importing and
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* renaming certain functions, allowing multiple libcelts to coexist.
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* See the original celt.h for extra info. */
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#ifndef _CELT_FSB_H
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#define _CELT_FSB_H
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#include "celt_types.h"
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#define EXPORT
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/** No error */
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#define CELT_OK 0
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/** GET the bit-stream version for compatibility check */
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#define CELT_GET_BITSTREAM_VERSION 2000
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/** State of the decoder. One decoder state is needed for each stream.
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It is initialised once at the beginning of the stream. Do *not*
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re-initialise the state for every frame */
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typedef struct CELT0061Decoder CELT0061Decoder;
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typedef struct CELT0110Decoder CELT0110Decoder;
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/** The mode contains all the information necessary to create an
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encoder. Both the encoder and decoder need to be initialised
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with exactly the same mode, otherwise the quality will be very
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bad */
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typedef struct CELT0061Mode CELT0061Mode;
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typedef struct CELT0110Mode CELT0110Mode;
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/* Mode calls */
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/** Creates a new mode struct. This will be passed to an encoder or
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decoder. The mode MUST NOT BE DESTROYED until the encoders and
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decoders that use it are destroyed as well.
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@param Fs Sampling rate (32000 to 96000 Hz)
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@param channels Number of channels
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@param frame_size Number of samples (per channel) to encode in each
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packet (even values; 64 - 512)
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@param error Returned error code (if NULL, no error will be returned)
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@return A newly created mode
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*/
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EXPORT CELT0061Mode *celt_0061_mode_create(celt_int32 Fs, int channels, int frame_size, int *error);
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EXPORT CELT0110Mode *celt_0110_mode_create(celt_int32 Fs, int frame_size, int *error);
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/** Destroys a mode struct. Only call this after all encoders and
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decoders using this mode are destroyed as well.
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@param mode Mode to be destroyed
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*/
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EXPORT void celt_0061_mode_destroy(CELT0061Mode *mode);
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EXPORT void celt_0110_mode_destroy(CELT0110Mode *mode);
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/** Query information from a mode */
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EXPORT int celt_0061_mode_info(const CELT0061Mode *mode, int request, celt_int32 *value);
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EXPORT int celt_0110_mode_info(const CELT0110Mode *mode, int request, celt_int32 *value);
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/* Decoder stuff */
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/** Creates a new decoder state. Each stream needs its own decoder state (can't
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be shared across simultaneous streams).
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@param mode Contains all the information about the characteristics of the
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stream (must be the same characteristics as used for the encoder)
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@param channels Number of channels
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@param error Returns an error code
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@return Newly created decoder state.
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*/
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EXPORT CELT0061Decoder *celt_0061_decoder_create(const CELT0061Mode *mode);
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EXPORT CELT0110Decoder *celt_0110_decoder_create_custom(const CELT0110Mode *mode, int channels, int *error);
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/** Destroys a a decoder state.
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@param st Decoder state to be destroyed
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*/
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EXPORT void celt_0061_decoder_destroy(CELT0061Decoder *st);
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EXPORT void celt_0110_decoder_destroy(CELT0110Decoder *st);
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/** Decodes a frame of audio.
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@param st Decoder state
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@param data Compressed data produced by an encoder
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@param len Number of bytes to read from "data". This MUST be exactly the number
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of bytes returned by the encoder. Using a larger value WILL NOT WORK.
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@param pcm One frame (frame_size samples per channel) of decoded PCM will be
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returned here in 16-bit PCM format (native endian).
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@return Error code.
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*/
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EXPORT int celt_0061_decode(CELT0061Decoder *st, const unsigned char *data, int len, celt_int16 *pcm);
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EXPORT int celt_0110_decode(CELT0110Decoder *st, const unsigned char *data, int len, celt_int16 *pcm, int frame_size);
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#endif /*_CELT_FSB_H */
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