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Diffstat (limited to 'media/libstagefright/codecs/amrnb/common/include/gc_pred.h')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/common/include/gc_pred.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/amrnb/common/include/gc_pred.h b/media/libstagefright/codecs/amrnb/common/include/gc_pred.h new file mode 100644 index 0000000..b82603c --- /dev/null +++ b/media/libstagefright/codecs/amrnb/common/include/gc_pred.h @@ -0,0 +1,176 @@ +/* ------------------------------------------------------------------ + * 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/gc_pred.h + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: Replaced "int" and/or "char" with OSCL defined types. + + Description: Moved _cplusplus #ifdef after Include section. + + Who: Date: + Description: + +------------------------------------------------------------------------------ + INCLUDE DESCRIPTION + + File : gc_pred.h + Purpose : codebook gain MA prediction + +------------------------------------------------------------------------------ +*/ + +#ifndef _GC_PRED_H_ +#define _GC_PRED_H_ +#define gc_pred_h "$Id $" + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ +#include "typedef.h" +#include "mode.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 + ----------------------------------------------------------------------------*/ + typedef struct + { + Word16 past_qua_en[4]; /* normal MA predictor memory, Q10 */ + /* (contains 20*log10(qua_err)) */ + Word16 past_qua_en_MR122[4]; /* MA predictor memory for MR122 mode, Q10 */ + /* (contains log2(qua_err)) */ + } gc_predState; + + /*---------------------------------------------------------------------------- + ; GLOBAL FUNCTION DEFINITIONS + ; [List function prototypes here] + ----------------------------------------------------------------------------*/ + + Word16 gc_pred_reset(gc_predState *st); + /* reset of codebook gain MA predictor state (i.e. set state memory to zero) + returns 0 on success + */ + void gc_pred_exit(gc_predState **st); + /* de-initialize codebook gain MA predictor state (i.e. free state struct) + stores NULL in *st + */ + + void + gc_pred_copy( + gc_predState *st_src, /* i : State struct */ + gc_predState *st_dest /* o : State struct */ + ); + + /* + * FUNCTION: gc_pred() + * PURPOSE: MA prediction of the innovation energy + * (in dB/(20*log10(2))) with mean removed). + */ + void gc_pred( + gc_predState *st, /* i/o: State struct */ + enum Mode mode, /* i : AMR mode */ + Word16 *code, /* i : innovative codebook vector (L_SUBFR) */ + /* MR122: Q12, other modes: Q13 */ + Word16 *exp_gcode0, /* o : exponent of predicted gain factor, Q0 */ + Word16 *frac_gcode0,/* o : fraction of predicted gain factor Q15 */ + Word16 *exp_en, /* o : exponent of innovation energy, Q0 */ + /* (only calculated for MR795) */ + Word16 *frac_en, /* o : fraction of innovation energy, Q15 */ + /* (only calculated for MR795) */ + Flag *pOverflow + ); + + /* + * FUNCTION: gc_pred_update() + * PURPOSE: update MA predictor with last quantized energy + */ + void gc_pred_update( + gc_predState *st, /* i/o: State struct */ + Word16 qua_ener_MR122, /* i : quantized energy for update, Q10 */ + /* (log2(qua_err)) */ + Word16 qua_ener /* i : quantized energy for update, Q10 */ + /* (20*log10(qua_err)) */ + ); + + /* + * FUNCTION: gc_pred_average_limited() + * PURPOSE: get average of MA predictor state values (with a lower limit) + * [used in error concealment] + */ + void gc_pred_average_limited( + gc_predState *st, /* i: State struct */ + Word16 *ener_avg_MR122, /* o: averaged quantized energy, Q10 */ + /* (log2(qua_err)) */ + Word16 *ener_avg, /* o: averaged quantized energy, Q10 */ + /* (20*log10(qua_err)) */ + Flag *pOverflow + ); + + +#ifdef __cplusplus +} +#endif + +#endif /* _GC_PRED_H_ */ + + + |