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Diffstat (limited to 'media/libstagefright/codecs/amrnb/common/include/d_gain_c.h')
-rw-r--r-- | media/libstagefright/codecs/amrnb/common/include/d_gain_c.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/common/include/d_gain_c.h b/media/libstagefright/codecs/amrnb/common/include/d_gain_c.h new file mode 100644 index 0000000..70868f4 --- /dev/null +++ b/media/libstagefright/codecs/amrnb/common/include/d_gain_c.h @@ -0,0 +1,125 @@ +/* ------------------------------------------------------------------ + * Copyright (C) 1998-2009 PacketVideo + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either + * express or implied. + * See the License for the specific language governing permissions + * and limitations under the License. + * ------------------------------------------------------------------- + */ +/**************************************************************************************** +Portions of this file are derived from the following 3GPP standard: + + 3GPP TS 26.073 + ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec + Available from http://www.3gpp.org + +(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) +Permission to distribute, modify and use this file under the standard license +terms listed above has been obtained from the copyright holder. +****************************************************************************************/ +/* + + Filename: /audio/gsm_amr/c/src/include/d_gain_c.h + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Moved _cplusplus #ifdef after Include section. + + Who: Date: + Description: + +------------------------------------------------------------------------------ + INCLUDE DESCRIPTION + + File : d_gain_c.h + Purpose : Decode the fixed codebook gain using the received index. + +------------------------------------------------------------------------------ +*/ + +#ifndef _D_GAIN_C_H_ +#define _D_GAIN_C_H_ +#define d_gain_c_h "$Id $" + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "typedef.h" +#include "mode.h" +#include "gc_pred.h" + +/*--------------------------------------------------------------------------*/ +#ifdef __cplusplus +extern "C" +{ +#endif + + /*---------------------------------------------------------------------------- + ; MACROS + ; [Define module specific macros here] + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; DEFINES + ; [Include all pre-processor statements here.] + ----------------------------------------------------------------------------*/ + + + /*---------------------------------------------------------------------------- + ; EXTERNAL VARIABLES REFERENCES + ; [Declare variables used in this module but defined elsewhere] + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; SIMPLE TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; ENUMERATED TYPEDEF'S + ----------------------------------------------------------------------------*/ + + /*---------------------------------------------------------------------------- + ; STRUCTURES TYPEDEF'S + ----------------------------------------------------------------------------*/ + + + /*---------------------------------------------------------------------------- + ; GLOBAL FUNCTION DEFINITIONS + ; [List function prototypes here] + ----------------------------------------------------------------------------*/ + /* + * Function : d_gain_code + * Purpose : Decode the fixed codebook gain using the received index. + * Description : The received index gives the gain correction factor + * gamma. The quantized gain is given by g_q = g0 * gamma + * where g0 is the predicted gain. To find g0, 4th order + * MA prediction is applied to the mean-removed innovation + * energy in dB. + * Returns : void + */ + void d_gain_code( + gc_predState *pred_state, /* i/o : MA predictor state */ + enum Mode mode, /* i : AMR mode */ + Word16 index, /* i : received quantization index */ + Word16 code[], /* i : innovation codevector */ + Word16 *gain_code, /* o : decoded innovation gain */ + Flag *pOverflow + ); + +#ifdef __cplusplus +} +#endif + +#endif /* _D_GAIN_C_H_ */ + + |