is there any alternative for wavread (in matlab) in c. i want to get the samples, sampling frequency and bits per sample???
thanks..
I got the program to read audio (.WAV)- courtesy: NAUFAL, CET
#include <stdio.h>
#include "wav.h"
main()
{
int16_t *samples = NULL;
wavread("track.wav", &samples);
printf("No. of channels: %d\n", header->num_channels);
printf("Sample rate: %d\n", header->sample_rate);
printf("Bit rate: %dkbps\n", header->byte_rate*8 / 1000);
printf("Bits per sample: %d\n\n", header->bps);
printf("Sample 0: %d\n", samples[0]);
printf("Sample 1: %d\n", samples[1]);
// Modify the header values & samples before writing the new file
wavwrite("track2.wav", samples);
free(header);
free(samples);
}wav.h
#include <inttypes.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <err.h>
typedef struct {
char chunk_id[4];
uint32_t chunk_size;
char format[4];
char fmtchunk_id[4];
uint32_t fmtchunk_size;
uint16_t audio_format;
uint16_t num_channels;
uint32_t sample_rate;
uint32_t byte_rate;
uint16_t block_align;
uint16_t bps;
char datachunk_id[4];
uint32_t datachunk_size;
}WavHeader;
WavHeader *header;
void wavread(char *file_name, int16_t **samples)
{
int fd;
if (!file_name)
errx(1, "Filename not specified");
if ((fd = open(file_name, O_RDONLY)) < 1)
errx(1, "Error opening file");
if (!header)
header = (WavHeader*)malloc(sizeof(WavHeader));
if (read(fd, header, sizeof(WavHeader)) < sizeof(WavHeader))
errx(1, "File broken: header");
if (strncmp(header->chunk_id, "RIFF", 4) ||
strncmp(header->format, "WAVE", 4))
errx(1, "Not a wav file");
if (header->audio_format != 1)
errx(1, "Only PCM encoding supported");
if (*samples) free(*samples);
*samples = (int16_t*)malloc(header->datachunk_size);
if (!*samples)
errx(1, "Error allocating memory");
if (read(fd, *samples, header->datachunk_size) < header->datachunk_size)
errx(1, "File broken: samples");
close(fd);
}
void wavwrite(char *file_name, int16_t *samples)
{
int fd;
if (!file_name)
errx(1, "Filename not specified");
if (!samples)
errx(1, "Samples buffer not specified");
if ((fd = creat(file_name, 0666)) < 1)
errx(1, "Error creating file");
if (write(fd, header, sizeof(WavHeader)) < sizeof(WavHeader))
errx(1, "Error writing header");
if (write(fd, samples, header->datachunk_size) < header->datachunk_size)
errx(1, "Error writing samples");
close(fd);
}audio file is here at http://rapidshare.com/files/456227826/track.wav
Thanks for all helps from Daniweb. Our project is complete. will be in touch...
thanks
May I know what does read/write function do?
