*/
#include <stdlib.h>
+#include <stdint.h>
#include <stdio.h>
+#include <string.h>
#define MAX_CHANNELS 8
FILE *outfile;
-static void put_sample(int v)
+static void put16(int16_t v)
{
- fputc(v & 0xff, outfile);
+ fputc( v & 0xff, outfile);
fputc((v >> 8) & 0xff, outfile);
}
+static void put32(uint32_t v)
+{
+ fputc( v & 0xff, outfile);
+ fputc((v >> 8) & 0xff, outfile);
+ fputc((v >> 16) & 0xff, outfile);
+ fputc((v >> 24) & 0xff, outfile);
+}
+
+#define HEADER_SIZE 46
+#define FMT_SIZE 18
+#define SAMPLE_SIZE 2
+#define WFORMAT_PCM 0x0001
+
+static void put_wav_header(int sample_rate, int channels, int nb_samples)
+{
+ int block_align = SAMPLE_SIZE * channels;
+ int data_size = block_align * nb_samples;
+
+ fputs("RIFF", outfile);
+ put32(HEADER_SIZE + data_size);
+ fputs("WAVEfmt ", outfile);
+ put32(FMT_SIZE);
+ put16(WFORMAT_PCM);
+ put16(channels);
+ put32(sample_rate);
+ put32(block_align * sample_rate);
+ put16(block_align);
+ put16(SAMPLE_SIZE * 8);
+ put16(0);
+ fputs("data", outfile);
+ put32(data_size);
+}
+
int main(int argc, char **argv)
{
int i, a, v, j, f, amp, ampa;
int taba[MAX_CHANNELS];
int sample_rate = 44100;
int nb_channels = 2;
+ char *ext;
if (argc < 2 || argc > 4) {
printf("usage: %s file [<sample rate> [<channels>]]\n"
"generate a test raw 16 bit audio stream\n"
+ "If the file extension is .wav a WAVE header will be added.\n"
"default: 44100 Hz stereo\n", argv[0]);
exit(1);
}
return 1;
}
+ if ((ext = strrchr(argv[1], '.')) != NULL && !strcmp(ext, ".wav"))
+ put_wav_header(sample_rate, nb_channels, 6 * sample_rate);
+
/* 1 second of single freq sinus at 1000 Hz */
a = 0;
for (i = 0; i < 1 * sample_rate; i++) {
v = (int_cos(a) * 10000) >> FRAC_BITS;
for (j = 0; j < nb_channels; j++)
- put_sample(v);
+ put16(v);
a += (1000 * FRAC_ONE) / sample_rate;
}
for (i = 0; i < 1 * sample_rate; i++) {
v = (int_cos(a) * 10000) >> FRAC_BITS;
for (j = 0; j < nb_channels; j++)
- put_sample(v);
+ put16(v);
f = 100 + (((10000 - 100) * i) / sample_rate);
a += (f * FRAC_ONE) / sample_rate;
}
for (i = 0; i < sample_rate / 2; i++) {
v = myrnd(&seed, 20000) - 10000;
for (j = 0; j < nb_channels; j++)
- put_sample(v);
+ put16(v);
}
/* 0.5 second of high amplitude white noise */
for (i = 0; i < sample_rate / 2; i++) {
v = myrnd(&seed, 65535) - 32768;
for (j = 0; j < nb_channels; j++)
- put_sample(v);
+ put16(v);
}
/* 1 second of unrelated ramps for each channel */
for (i = 0; i < 1 * sample_rate; i++) {
for (j = 0; j < nb_channels; j++) {
v = (int_cos(taba[j]) * 10000) >> FRAC_BITS;
- put_sample(v);
+ put16(v);
f = tabf1[j] + (((tabf2[j] - tabf1[j]) * i) / sample_rate);
taba[j] += (f * FRAC_ONE) / sample_rate;
}
if (j & 1)
amp = 10000 - amp;
v = (int_cos(a) * amp) >> FRAC_BITS;
- put_sample(v);
+ put16(v);
a += (500 * FRAC_ONE) / sample_rate;
ampa += (2 * FRAC_ONE) / sample_rate;
}