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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* arith_routins.h
*
* Functions for arithmetic coding.
*
*/
#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_FIX_SOURCE_ARITH_ROUTINS_H_
#define WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_FIX_SOURCE_ARITH_ROUTINS_H_
#include "structs.h"
/****************************************************************************
* WebRtcIsacfix_EncLogisticMulti2(...)
*
* Arithmetic coding of spectrum.
*
* Input:
* - streamData : in-/output struct containing bitstream
* - dataQ7 : data vector in Q7
* - envQ8 : side info vector defining the width of the pdf
* in Q8
* - lenData : data vector length
*
* Return value : 0 if ok,
* <0 otherwise.
*/
int WebRtcIsacfix_EncLogisticMulti2(
Bitstr_enc *streamData,
WebRtc_Word16 *dataQ7,
const WebRtc_UWord16 *env,
const WebRtc_Word16 lenData);
/****************************************************************************
* WebRtcIsacfix_EncTerminate(...)
*
* Final call to the arithmetic coder for an encoder call. This function
* terminates and return byte stream.
*
* Input:
* - streamData : in-/output struct containing bitstream
*
* Return value : number of bytes in the stream
*/
WebRtc_Word16 WebRtcIsacfix_EncTerminate(Bitstr_enc *streamData);
/****************************************************************************
* WebRtcIsacfix_DecLogisticMulti2(...)
*
* Arithmetic decoding of spectrum.
*
* Input:
* - streamData : in-/output struct containing bitstream
* - envQ8 : side info vector defining the width of the pdf
* in Q8
* - lenData : data vector length
*
* Input/Output:
* - dataQ7 : input: dither vector, output: data vector, in Q7
*
* Return value : number of bytes in the stream so far
* <0 if error detected
*/
WebRtc_Word16 WebRtcIsacfix_DecLogisticMulti2(
WebRtc_Word16 *data,
Bitstr_dec *streamData,
const WebRtc_Word32 *env,
const WebRtc_Word16 lenData);
/****************************************************************************
* WebRtcIsacfix_EncHistMulti(...)
*
* Encode the histogram interval
*
* Input:
* - streamData : in-/output struct containing bitstream
* - data : data vector
* - cdf : array of cdf arrays
* - lenData : data vector length
*
* Return value : 0 if ok
* <0 if error detected
*/
int WebRtcIsacfix_EncHistMulti(
Bitstr_enc *streamData,
const WebRtc_Word16 *data,
const WebRtc_UWord16 **cdf,
const WebRtc_Word16 lenData);
/****************************************************************************
* WebRtcIsacfix_DecHistBisectMulti(...)
*
* Function to decode more symbols from the arithmetic bytestream, using
* method of bisection.
* C df tables should be of size 2^k-1 (which corresponds to an
* alphabet size of 2^k-2)
*
* Input:
* - streamData : in-/output struct containing bitstream
* - cdf : array of cdf arrays
* - cdfSize : array of cdf table sizes+1 (power of two: 2^k)
* - lenData : data vector length
*
* Output:
* - data : data vector
*
* Return value : number of bytes in the stream
* <0 if error detected
*/
WebRtc_Word16 WebRtcIsacfix_DecHistBisectMulti(
WebRtc_Word16 *data,
Bitstr_dec *streamData,
const WebRtc_UWord16 **cdf,
const WebRtc_UWord16 *cdfSize,
const WebRtc_Word16 lenData);
/****************************************************************************
* WebRtcIsacfix_DecHistOneStepMulti(...)
*
* Function to decode more symbols from the arithmetic bytestream, taking
* single step up or down at a time.
* cdf tables can be of arbitrary size, but large tables may take a lot of
* iterations.
*
* Input:
* - streamData : in-/output struct containing bitstream
* - cdf : array of cdf arrays
* - initIndex : vector of initial cdf table search entries
* - lenData : data vector length
*
* Output:
* - data : data vector
*
* Return value : number of bytes in original stream
* <0 if error detected
*/
WebRtc_Word16 WebRtcIsacfix_DecHistOneStepMulti(
WebRtc_Word16 *data,
Bitstr_dec *streamData,
const WebRtc_UWord16 **cdf,
const WebRtc_UWord16 *initIndex,
const WebRtc_Word16 lenData);
#endif /* WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_FIX_SOURCE_ARITH_ROUTINS_H_ */
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