g729格式通常用于电话线路
一些常用的格式转换命令
mp3转8k单channel wav文件
sox 0505.mp3 0505.wav rate 8k channels 1
wav转pcm
ffmpeg -i 0505.wav -f s16le -ar 8000 -acodec 0505.pcm
pcm转g729文件
./encoderTest 0505.pcm
m4a转wav文件
ffmpeg -i test.m4a -acodec pcm_s16le -ac 1 -ar 16000 out.wav
g729转wav文件
ffmpeg -acodec g729 -f g729 -i out.g729 -ar 8000 test.wav
encoderTest.c
/*
encoderTest.c
Copyright (C) 2011 Belledonne Communications, Grenoble, France
Author : Johan Pascal
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*****************************************************************************/
/* */
/* Test Program for encoder */
/* Input: the reconstructed signal : each frame (80 16 bits PCM values) */
/* on a row of a text CSV file */
/* Output: 15 parameters on each row of a text CSV file. */
/* */
/*****************************************************************************/
#include
#include
#include
#include "typedef.h"
#include "codecParameters.h"
#include "utils.h"
#include "testUtils.h"
#include "bcg729/encoder.h"
int main(int argc, char *argv[] )
{
/*** get calling argument ***/
char *filePrefix;
getArgument(argc, argv, &filePrefix); /* check argument and set filePrefix if needed */
/*** input and output file pointers ***/
FILE *fpInput;
/*** input and output buffers ***/
int16_t inputBuffer[L_FRAME]; /* output buffer: the signal */
uint8_t bitStream[10]; /* binary output of the encoder */
// uint16_t outputBuffer[NB_PARAMETERS]; /* output buffer: an array containing the 15 parameters */
if ( (fpInput = fopen(argv[1], "rb")) == NULL) {
printf("%s - Error: can't open file %s\n", argv[0], argv[1]);
exit(-1);
}
/* create the output file(filename is the same than input file with the .out extension) */
char *outputFile = malloc((strlen(filePrefix)+20)*sizeof(char));
FILE *fpBinOutput;
sprintf(outputFile, "%s.g729",filePrefix);
if ( (fpBinOutput = fopen(outputFile, "wb")) == NULL) {
printf("%s - Error: can't create file %s\n", argv[0], outputFile);
exit(-1);
}
/*** init of the tested bloc ***/
bcg729EncoderChannelContextStruct *encoderChannelContext = initBcg729EncoderChannel(0);
/*** initialisation complete ***/
/* increase LOOP_N to increase input length and perform a more accurate profiling or perf measurement */
#define LOOP_N 1
int j;
for (j=0; j
/* perf measurement */
printf("begin encoding\n");
/*** loop over input file ***/
while(1) /* infinite loop, escape condition is in the reading of data */
{
uint8_t bitStreamLength;
/* read the input data until we have some */
if (fread(inputBuffer, sizeof(int16_t), L_FRAME, fpInput) != L_FRAME) break;
bcg729Encoder(encoderChannelContext, inputBuffer, bitStream, &bitStreamLength);
fwrite(bitStream, sizeof(int8_t), 10, fpBinOutput);
}
/* perf measurement */
printf("close input file\n");
rewind(fpInput);
}
closeBcg729EncoderChannel(encoderChannelContext);
free(outputFile);
printf("finish encoding\n");
exit (0);
}
test文件夹cmakelist.txt增加
include_directories( ${CMAKE_SOURCE_DIR}/../src )
include_directories( ${CMAKE_SOURCE_DIR}/../include )
link_directories(/usr/local/lib)
