16转8是雷神的
int pcm16le_to_pcm8(char * url) {
FILE *fp = fopen(url, "rb+");
FILE *fp1 = fopen("output_8.pcm", "wb+");
int cnt = 0;
unsigned char* sample = (unsigned char *) malloc(4);
while (!feof(fp)) {
fread(sample, 1, 4, fp);
short *samplenum16 = NULL;
char samplenum8 = 0;
unsigned char samplenum8_u = 0;
samplenum16 = (short*) sample;
samplenum8 = (*samplenum16) >> 8;
samplenum8_u = samplenum8 + 128;
fwrite(&samplenum8_u, 1, 1, fp1);
samplenum16 = (short*) (sample + 2);
samplenum8 = (*samplenum16) >> 8;
samplenum8_u = samplenum8 + 128;
fwrite(&samplenum8_u, 1, 1, fp1);
cnt++;
}
printf("Sample Cnt:%d\n", cnt);
free(sample);
fclose(fp);
fclose(fp1);
return 0;
}
int pcm8le_to_pcm16(char * url) {
FILE *fp = fopen(url, "rb+");
FILE *fp1 = fopen("output_16.pcm", "wb+");
int cnt = 0;
unsigned char* sample = (unsigned char *) malloc(2);
while (!feof(fp)) {
fread(sample, 1, 2, fp);
short sample8 = (short) (sample[0] - 128);
short sample16 = sample8 << 8;
fwrite(&sample16, 1, 2, fp1);
sample8 = (short) (sample[1] - 128);
sample16 = sample8 << 8;
fwrite(&sample16, 1, 2, fp1);
cnt++;
}
printf("Sample Cnt:%d\n", cnt);
free(sample);
fclose(fp);
fclose(fp1);
return 0;
}