1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /**************************************************************************************** 19 Portions of this file are derived from the following 3GPP standard: 20 21 3GPP TS 26.073 22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23 Available from http://www.3gpp.org 24 25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26 Permission to distribute, modify and use this file under the standard license 27 terms listed above has been obtained from the copyright holder. 28 ****************************************************************************************/ 29 /* 30 ******************************************************************************** 31 * 32 * GSM AMR-NB speech codec R98 Version 7.5.0 March 2, 2001 33 * R99 Version 3.2.0 34 * REL-4 Version 4.0.0 35 * 36 ******************************************************************************** 37 * 38 * File : d_gain_p.h 39 * Purpose : Decodes the pitch gain using the received index. 40 * 41 ******************************************************************************** 42 */ 43 #ifndef d_gain_p_h 44 #define d_gain_p_h "$Id $" 45 46 /* 47 ******************************************************************************** 48 * INCLUDE FILES 49 ******************************************************************************** 50 */ 51 #include "typedef.h" 52 #include "mode.h" 53 54 #ifdef __cplusplus 55 extern "C" 56 { 57 #endif 58 59 /* 60 ************************************************************************** 61 * 62 * Function : d_gain_pitch 63 * Purpose : Decodes the pitch gain using the received index. 64 * Description : In case of no frame erasure, the gain is obtained 65 * from the quantization table at the given index; 66 * otherwise, a downscaled past gain is used. 67 * Returns : Quantized pitch gain 68 * 69 ************************************************************************** 70 */ 71 Word16 d_gain_pitch( /* return value: gain (Q14) */ 72 enum Mode mode, /* i : AMR mode */ 73 Word16 index /* i : index of quantization */ 74 ); 75 76 #ifdef __cplusplus 77 } 78 #endif 79 80 #endif 81
