| /* |
| * 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_ */ |