tr, sf_count_t frames) ;
sf_count_t sf_writef_float (SNDFILE *sndfile, float *ptr, sf_count_t frames) ;
sf_count_t sf_writef_double (SNDFILE *sndfile, double *ptr, sf_count_t frames) ;下面再给一个写音频文件的例子：
[cpp]
#include
#include
#include
#include
#include
#define SAMPLE_RATE 44100
#define SAMPLE_COUNT (SAMPLE_RATE * 4) /* 4 seconds */
#define AMPLITUDE (1.0 * 0x7F000000)
#define LEFT_FREQ (344.0 / SAMPLE_RATE)
#define RIGHT_FREQ (2 * 344.0 / SAMPLE_RATE)
int main (void)
{ SNDFILE *file ;
SF_INFO sfinfo ;
int k ;
int *buffer ;
if (! (buffer = malloc (2 * SAMPLE_COUNT * sizeof (int))))
{ printf ("Malloc failed.\n") ;
exit (0) ;
} ;
memset (&sfinfo, 0, sizeof (sfinfo)) ;
sfinfo.samplerate = SAMPLE_RATE ;
sfinfo.frames = SAMPLE_COUNT ;
sfinfo.channels = 2 ;
sfinfo.format = (SF_FORMAT_WAV | SF_FORMAT_PCM_16) ;
if (! (file = sf_open ("sine.wav", SFM_WRITE, &sfinfo)))
{ printf ("Error : Not able to open output file.\n") ;
return 1 ;
} ;
for (k = 0 ; k < SAMPLE_COUNT ; k++)
{ buffer [2 * k] = AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI) ;
buffer [2 * k + 1] = AMPLITUDE * cos (RIGHT_FREQ * 2 * k * M_PI) ;
} ;
if (sf_write_int (file, buffer, sfinfo.channels * SAMPLE_COUNT) != sfinfo.channels * SAMPLE_COUNT)
puts (sf_strerror (file)) ;
sf_close (file) ;
return 0 ;
}
#include
#include
#include
#include
#include
#define SAMPLE_RATE 44100
#define SAMPLE_COUNT (SAMPLE_RATE * 4) /* 4 seconds */
#define AMPLITUDE (1.0 * 0x7F000000)
#define LEFT_FREQ (344.0 / SAMPLE_RATE)
#define RIGHT_FREQ (2 * 344.0 / SAMPLE_RATE)
int main (void)
{ SNDFILE *file ;
SF_INFO sfinfo ;
int k ;
int *buffer ;
if (! (buffer = malloc (2 * SAMPLE_COUNT * sizeof (int))))
{ printf ("Malloc failed.\n") ;
exit (0) ;
} ;
memset (&sfinfo, 0, sizeof (sfinfo)) ;
sfinfo.samplerate = SAMPLE_RATE ;
sfinfo.frames = SAMPLE_COUNT ;
sfinfo.channels = 2 ;
sfinfo.format = (SF_FORMAT_WAV | SF_FORMAT_PCM_16) ;
if (! (file = sf_open ("sine.wav", SFM_WRITE, &sfinfo)))
{ printf ("Error : Not able to open output file.\n") ;
return 1 ;
} ;
for (k = 0 ; k < SAMPLE_COUNT ; k++)
{ buffer [2 * k] = AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI) ;
buffer [2 * k + 1] = AMPLITUDE * cos (RIGHT_FREQ * 2 * k * M_PI) ;
} ;
if (sf_write_int (file, buffer, sfinfo.channels * SAMPLE_COUNT) != sfinfo.channels * SAMPLE_COUNT)
puts (sf_strerror (file)) ;
sf_close (file) ;
return 0 ;
}
除此之外，还有些其他的函数。用法都比较简单，这里就不多介绍了。