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channel_separate.c
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channel_separate.c
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/*************************************************************************
> File Name: channel_separate.c
> Author: answer
> Mail: [email protected]
> Created Time: Mon 21 Nov 2016 04:55:18 PM CST
************************************************************************/
/*
* Usage: channel_separate input_channel(s) input_file
* Function: separate the input_file, save as ./channeln.pcm(n is number of channel)
*/
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/stat.h>
#include"buffer.h"
#include"config.h"
int main(int argc, const char *argv[])
{
/* judge arg */
if(argc != 3)
{
fprintf(stderr,"Usage: channel_separate input_channel(s) input_file\n");
exit(EXIT_FAILURE);
}
int raw = atoi(argv[1]);
/* judge channel(s) */
if (raw <= 0 || raw > 16)
{
fprintf(stderr,"Error: channel(s) must be positive number and max channels is 16.\n");
exit(EXIT_FAILURE);
}
else if (raw == 1)
{
fprintf(stderr,"Note: %s is mono audio data,exit.\n",argv[2]);
exit(EXIT_SUCCESS);
}
else
{
printf("Action: separate channel(s)\n");
}
/* open file */
FILE *in = fopen(argv[2],"rb");
if(in == NULL)
{
fprintf(stderr,"Error:%s open failed!\n",argv[2]);
exit(EXIT_FAILURE);
}
printf("Running message:\n input_file:%s\n input_channel(s):%d\n\n",argv[2],raw);
int frame_len = LENGTH * raw;
/* get size of input_file */
struct stat statbuf;
stat(argv[2],&statbuf);
size_t size = statbuf.st_size; // st_size: long long int/long int 64/32
//printf("%d\n",size);
size = size%frame_len ? size - size%frame_len : size; // file size
//printf("%ld\n",size);
size_t n = size/frame_len; // dot numbers
/* read input_file to buf */
short int *in_buf = (short int *)audio_calloc(1,size);
if(fread(in_buf,1,size,in) != size)
{
fprintf(stderr,"Error:read %s failed.\n",argv[2]);
exit(EXIT_FAILURE);
}
int i = 0;
size_t j = 0;
FILE *out = NULL;
short int *out_buf = (short int *)audio_calloc(n,LENGTH);
char *output_file = (char *)audio_calloc(1,14);
for (i = 0;i < raw;i++)
{
/* create output file */
sprintf(output_file,"channel%d.pcm",i+1);
// printf("%s\n",output_file);
out = fopen(output_file,"wb");
if(out == NULL)
{
fprintf(stderr,"Error:%s open failed!\n",output_file);
exit(EXIT_FAILURE);
}
/* write one channel to output file */
for (j = 0;j < n;j++)
{
out_buf[j] = in_buf[i+j*raw];
}
fwrite(out_buf,LENGTH,n,out);
memset(out_buf, 0, n*LENGTH);
memset(output_file, 0, 14);
fclose(out);
}
audio_free(in_buf);
audio_free(out_buf);
audio_free(output_file);
fclose(in);
printf("\nSuccess,output_files in current dirctory.\n");
return 0;
}