decoder.c

语音编码G.729 语音编码G.729

/*
   ITU-T G.729 Annex C - Reference C code for floating point
                         implementation of G.729 Annex A
                         Version 1.01 of 15.September.98
*/

/*
----------------------------------------------------------------------
                    COPYRIGHT NOTICE
----------------------------------------------------------------------
   ITU-T G.729 Annex C ANSI C source code
   Copyright (C) 1998, AT&T, France Telecom, NTT, University of
   Sherbrooke.  All rights reserved.

----------------------------------------------------------------------
*/

/*-----------------------------------------------------------------*
 * Main program of the G.729a 8.0 kbit/s decoder.                  *
 *                                                                 *
 *    Usage : decoder  bitstream_file  synth_file                  *
 *                                                                 *
 *-----------------------------------------------------------------*/

#include "typedef.h"
#include "ld8k.h"
#include "cst_ld8c.h"
#include "octet.h"

/*-----------------------------------------------------------------*
 *            Main decoder routine                                 *
 *-----------------------------------------------------------------*/

int main( int argc, char *argv[])
{
	static FLOAT  synth_buf[L_FRAME+M];     /* Synthesis                  */
	FLOAT  *synth;
	static int parm[2+PRM_SIZE];            /* Synthesis parameters + BFI */
	static INT16 serial[SERIAL_SIZE];      /* Serial stream              */
	static FLOAT  Az_dec[MP1*2];            /* Decoded Az for post-filter */
	FLOAT  *ptr_Az;
	static int T2[2];                       /* Decoded Pitch              */
	int    t0_first;             /* Pitch lag in 1st subframe   */
	FLOAT  pst_out[L_FRAME];     /* Postfilter output           */

	int    voicing;              /* voicing from previous frame */
	int    sf_voic;              /* voicing for subframe        */

	int count_frame;
	int i;
	int Vad;
	FILE   *f_syn, *f_serial;

	/* New unstaticed states */
	struct preproc_state_t postproc_s;
	struct dec_state_t dec_s;
	struct postfilt_state_t postfilt_s;


	printf("\n");
	printf("************  ITU G.729 8.0 KBIT/S SPEECH DECODER  ************\n");
	printf("                       (WITH ANNEX B)                           \n");
	printf("\n");
	printf("----------------- Floating point C simulation ----------------\n");
	printf("\n");
	printf("-----------------          Version 1.04       ----------------\n");
	printf("\n");

   /* Passed arguments */

   if ( argc != 3)
     {
        printf("Usage :%s bitstream_file  outputspeech_file\n",argv[0]);
        printf("\n");
        printf("Format for bitstream_file:\n");
        printf("  One (2-byte) synchronization word \n");
        printf("  One (2-byte) size word,\n");
        printf("  80 words (2-byte) containing 80 bits.\n");
        printf("\n");
        printf("Format for outputspeech_file:\n");
        printf("  Synthesis is written to a binary file of 16 bits data.\n");
        exit( 1 );
     }

   /* Open file for synthesis and packed serial stream */

   if( (f_serial = fopen(argv[1],"rb") ) == NULL )
     {
        printf("%s - Error opening file  %s !!\n", argv[0], argv[1]);
        exit(0);
     }

   if( (f_syn = fopen(argv[2], "wb") ) == NULL )
     {
        printf("%s - Error opening file  %s !!\n", argv[0], argv[2]);
        exit(0);
     }

	printf("Input bitstream file  :   %s\n",argv[1]);
	printf("Synthesis speech file :   %s\n",argv[2]);

#ifndef OCTET_TX_MODE
	printf("OCTET TRANSMISSION MODE is disabled\n");
#endif

/*-----------------------------------------------------------------*
 *           Initialization of decoder                             *
 *-----------------------------------------------------------------*/

	for (i=0; i<M; i++) synth_buf[i] = (F)0.0;
	synth = synth_buf + M;

	init_decod_ld8c(&dec_s);
	init_post_filter(&postfilt_s);
	init_post_process(&postproc_s);
	voicing = 60;

	/* for G.729b */
	init_dec_cng(&dec_s.cng_s);

/*-----------------------------------------------------------------*
 *            Loop for each "L_FRAME" speech data                  *
 *-----------------------------------------------------------------*/

	count_frame = 0;
	while (read_frame(f_serial, parm) != 0)
	{
		printf("Frame = %d\r", count_frame++);

		decod_ld8c(&dec_s, parm, voicing, synth, Az_dec, &t0_first, &Vad);
		
		/* Postfilter */
		voicing = 0;
		ptr_Az = Az_dec;
		for (i=0; i<L_FRAME; i+=L_SUBFR)
		{
			post(&postfilt_s, t0_first, synth + i, ptr_Az, pst_out + i, &sf_voic, Vad);
			if (sf_voic != 0)
				voicing = sf_voic;
			ptr_Az += MP1;
		}
		copy(&synth_buf[L_FRAME], &synth_buf[0], M);

		post_process(&postproc_s, pst_out, L_FRAME);

		fwrite16(pst_out, L_FRAME, f_syn);
	}

   return(0);
}