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channel_get.c
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channel_get.c
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/*************************************************************************
> File Name: channel_get.c
> Author: answer
> Mail: [email protected]
> Created Time: Mon 21 Nov 2016 04:59:30 PM CST
************************************************************************/
/*
* Usage: channel_get input_channel(s) input_file output_channel_number output_file
* Function: get one of the channels from input_file, save sa output_file
*/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"buffer.h"
#include"config.h"
int main(int argc, const char *argv[])
{
/* judge arg */
if(argc != 5)
{
fprintf(stderr,"Usage: channel_get input_channel(s) input_file output_channel_number output_file\n");
exit(EXIT_FAILURE);
}
int raw = atoi(argv[1]);
int n = atoi(argv[3]); // which channel
if (raw <= 0 || n <= 0 || raw > 16 || n > 16)
{
fprintf(stderr,"Error: channel(s) must be positive number and max channels is 16.\n");
exit(EXIT_FAILURE);
}
/* judge channel(s) */
if (raw == 1)
{
fprintf(stderr,"Note: %s is mono audio data,exit.\n",argv[2]);
exit(EXIT_SUCCESS);
}
else if (raw >= n)
{
printf("Action: get NO.%d channel data from %s\n",n,argv[2]);
}
else
{
fprintf(stderr,"Error: %s is only %d channels,No.%d output_channel out of range.\n",argv[2],raw,n);
exit(EXIT_FAILURE);
}
/* open file */
FILE *in = fopen(argv[2],"rb");
if(in == NULL)
{
fprintf(stderr,"Error:%s open failed!\n",argv[2]);
exit(EXIT_FAILURE);
}
FILE *out = fopen(argv[4],"wb");
if(out == NULL)
{
fprintf(stderr,"Error:%s open failed!\n",argv[4]);
exit(EXIT_FAILURE);
}
//int frame_len = sizeof(short int) * raw;
short int *in_buf = (short int *)audio_calloc(raw,LENGTH);
short int *out_buf = (short int *)audio_calloc(1,LENGTH);
printf("Running message:\n input_file:%s\n input_channel(s):%d\n output_file:%s\n output_channel(s):%d\n\n",argv[2],raw,argv[4],n);
while(1)
{
if(fread(in_buf,LENGTH,raw,in) != raw)
break;
out_buf[0] = in_buf[n-1];
fwrite(out_buf,LENGTH,1,out);
memset(in_buf, 0, raw*LENGTH);
memset(out_buf, 0, 1*LENGTH);
}
audio_free(in_buf);
audio_free(out_buf);
fclose(in);
fclose(out);
printf("\nSuccess\n");
return 0;
}