www.pudn.com > g7x.rar > dec_g723.c
/* $Id: dec_g723.c,v 1.7 1999/05/20 10:23:32 purnhage Exp $ */
/************************* MPEG-2 NBC Audio Decoder **************************
* *
"This software module was originally developed by
Fraunhofer Gesellschaft IIS / University of Erlangen (UER) in the course of
development of the MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7,
14496-1,2 and 3. This software module is an implementation of a part of one or more
MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4
Audio standard. ISO/IEC gives users of the MPEG-2 NBC/MPEG-4 Audio
standards free license to this software module or modifications thereof for use in
hardware or software products claiming conformance to the MPEG-2 NBC/MPEG-4
Audio standards. Those intending to use this software module in hardware or
software products are advised that this use may infringe existing patents.
The original developer of this software module and his/her company, the subsequent
editors and their companies, and ISO/IEC have no liability for use of this software
module or modifications thereof in an implementation. Copyright is not released for
non MPEG-2 NBC/MPEG-4 Audio conforming products.The original developer
retains full right to use the code for his/her own purpose, assign or donate the
code to a third party and to inhibit third party from using the code for non
MPEG-2 NBC/MPEG-4 Audio conforming products. This copyright notice must
be included in all copies or derivative works."
Copyright(c)1996.
* *
****************************************************************************/
/* CREATED BY :
SE Sebastien Etienne, Jean Bernard Rault, CCETT */
/* 26-mar-97 SE first version. */
/* 13-may-97 SE integration in the VM. */
/*******************************************************************************************
*
* Master module for G723 based codecs
*
******************************************************************************************/
#include
#include
#include "block.h" /* handler, defines, enums */
#include "buffersHandle.h" /* handler, defines, enums */
#include "concealmentHandle.h" /* handler, defines, enums */
#include "interface.h" /* handler, defines, enums */
#include "mod_bufHandle.h" /* handler, defines, enums */
#include "reorderspecHandle.h" /* handler, defines, enums */
#include "resilienceHandle.h" /* handler, defines, enums */
#include "tf_mainHandle.h" /* handler, defines, enums */
#include "lpc_common.h" /* structs */
#include "nok_ltp_common.h" /* structs */
#include "obj_descr.h" /* structs */
#include "tf_mainStruct.h" /* structs */
#include "bitstream.h"
#include "common_m4a.h"
#include "dec_g723.h"
#include "typedef2.h"
#include "cst2.h" /* for frame definition */
#include "g723_decoder.h"
#include "../src_tf/tf_main.h" /* need MONO_CHAN */
#define PROGVER "ITU-T G.723.1 Floating Point Speech Coder ANSI C Source Code. Version 5.1F"
/* ITU-T G.723 variables: */
enum Crate WrkRate = Rate63;
Flag UseHp = True;
Flag UsePf = True;
Flag UseVx = False;
Flag UsePr = True;
/*****************************************************************************************
***
*** Function: DecG723Info
***
*** Purpose: Information about the G723-part of the VM
***
*** Description:
***
***
*** Parameters:
***
***
*** Return Value:
***
*** **** MPEG-4 VM ****
***
****************************************************************************************/
char *DecG723Info (
FILE *helpStream) /* in: print decPara help text to helpStream */
/* if helpStream not NULL */
/* returns: core version string */
{
if (helpStream != NULL) {
fprintf(helpStream,
PROGVER "\n"
"decoder parameter string format:\n"
"possible options:\n"
"-Noh : Highpassfilter disabled \n"
"-Nop : Postfilter disabled \n"
"-v : VAD/CNG enabled \n"
"\n");
}
return PROGVER;
}
/*****************************************************************************************
***
*** Function: DecG723Init
***
*** Purpose: Initialize the G723-part and the macro blocks of the G723 part of the VM
***
*** Description:
***
***
*** Parameters:
***
***
*** Return Value:
***
*** **** MPEG-4 VM ****
***
****************************************************************************************/
void DecG723Init ( int numChannel, /* in: num audio channels */
float fSample, /* in: sampling frequancy [Hz] */
float bitRate, /* in: bit rate [bit/sec] */
char* decPara, /* in: decoder parameter string */
int* frameNumSample, /* out: num samples per frame */
int* delayNumSample ) /* out: encoder delay (num samples) */
{
if( strstr( decPara, "-v" ) ) {
UseVx = True ;
}
if( strstr( decPara, "-Noh" ) ) {
UseHp = False;
}
if( strstr( decPara, "-Nop" ) ) {
UsePf = False;
}
if (numChannel != 1)
CommonExit(1,"EncG723Init: audio data has more the one channel (%d)",
numChannel);
if (fSample != 8000.0)
CommonExit(1,"EncG723Init: fsampe out of range (%f)",
fSample);
if ((bitRate != 5334) && (bitRate != 6400.0))
CommonExit(1,"EncG723Init: bitrate out of range (%f), must be 5333 or 6400",
bitRate);
if(UsePf == 0)
printf("EncG723Init: Postfilter disabled\n");
else
printf("EncG723Init: Postfilter enabled\n");
if (bitRate == 6400)
{
WrkRate = Rate63;
printf("EncG723Init: Rate 6.3 kb/s\n");
}
else
{
WrkRate = Rate53;
printf("EncG723Init: Rate 5.3 kb/s\n");
}
if (UseHp == 0)
printf("EncG723Init: Highpassfilter disabled\n");
else
printf("EncG723Init: Highpassfilter enabled\n");
if (UseVx == 0)
printf("EncG723Init: VAD/CNG disabled\n");
else
printf("EncG723Init: VAD/CNG enabled\n");
g723_decoder_init();
*frameNumSample = Frame;
*delayNumSample = 0;
}
/*****************************************************************************************
***
*** Function: DecG723Frame
***
*** Purpose: processes a block of time signal input samples into a bitstream
*** based on G723 encoding
***
*** Description:
***
***
*** Parameters:
***
***
*** Return Value: returns the number of used bits
***
*** **** MPEG-4 VM ****
***
****************************************************************************************/
void DecG723Frame (
BsBitBuffer *bitBuf, /* in: bit stream frame */
float **sampleBuf, /* out: frameNumSample audio samples */
int *usedNumBit /* out: num bits used for this frame */
)
{
Word16 tab1[Frame];
BsBitStream *bs;
int i;
int nb;
nb = 0;
bs = BsOpenBufferRead(bitBuf);
g723_decoder(bs,tab1);
{
for (i=0; i< Frame; i++)
{
sampleBuf[MONO_CHAN][i] = (float)tab1[i];
}
nb = 1;
}
if ( WrkRate == Rate63)
*usedNumBit = nb*192; /* 24*8 = 192*/
else
*usedNumBit = nb*160; /* 20*8 = 160*/
/* g723_decoder(bs,tab1); */
/* { */
/* for (i=0; i< Frame; i++) */
/* { */
/* sampleBuf[MONO_CHAN][i+Frame] = (float)tab1[i]; */
/* } */
/* nb = 2; */
/* } */
/* printf("NB :%d \n",nb); */
/* if ( WrkRate == Rate63) */
/* *usedNumBit += nb*192; / 24*8 = 192*/
/* else */
/* *usedNumBit += nb*160; / 20*8 = 160*/
BsClose(bs);
}