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Allow audiogen to take commandline parameters for sample rate and number of 

channels.

Originally committed as revision 25127 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-09-15 21:36:04 +00:00
parent 160918d588
commit 6c834328b9
1 changed files with 47 additions and 29 deletions
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76
tests/audiogen.c
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@ -24,8 +24,7 @@
#include <stdlib.h>
#include <stdio.h>
#define NB_CHANNELS 2
#define FE 44100
#define MAX_CHANNELS 8
static unsigned int myrnd(unsigned int *seed_ptr, int n)
{
@ -104,15 +103,34 @@ int main(int argc, char **argv)
{
int i, a, v, j, f, amp, ampa;
unsigned int seed = 1;
int tabf1[NB_CHANNELS], tabf2[NB_CHANNELS];
int taba[NB_CHANNELS];
int tabf1[MAX_CHANNELS], tabf2[MAX_CHANNELS];
int taba[MAX_CHANNELS];
int sample_rate = 44100;
int nb_channels = 2;
if (argc != 2) {
printf("usage: %s file\n"
"generate a test raw 16 bit stereo audio stream\n", argv[0]);
if (argc < 2 || argc > 4) {
printf("usage: %s file [<sample rate> [<channels>]]\n"
"generate a test raw 16 bit audio stream\n"
"default: 44100 Hz stereo\n", argv[0]);
exit(1);
}
if (argc > 2) {
sample_rate = atoi(argv[2]);
if (sample_rate <= 0) {
fprintf(stderr, "invalid sample rate: %d\n", sample_rate);
return 1;
}
}
if (argc > 3) {
nb_channels = atoi(argv[3]);
if (nb_channels < 1 || nb_channels > MAX_CHANNELS) {
fprintf(stderr, "invalid number of channels: %d\n", nb_channels);
return 1;
}
}
outfile = fopen(argv[1], "wb");
if (!outfile) {
perror(argv[1]);
@ -121,64 +139,64 @@ int main(int argc, char **argv)
/* 1 second of single freq sinus at 1000 Hz */
a = 0;
for(i=0;i<1 * FE;i++) {
for(i=0;i<1 * sample_rate;i++) {
v = (int_cos(a) * 10000) >> FRAC_BITS;
for(j=0;j<NB_CHANNELS;j++)
for(j=0;j<nb_channels;j++)
put_sample(v);
a += (1000 * FRAC_ONE) / FE;
a += (1000 * FRAC_ONE) / sample_rate;
}
/* 1 second of varing frequency between 100 and 10000 Hz */
a = 0;
for(i=0;i<1 * FE;i++) {
for(i=0;i<1 * sample_rate;i++) {
v = (int_cos(a) * 10000) >> FRAC_BITS;
for(j=0;j<NB_CHANNELS;j++)
for(j=0;j<nb_channels;j++)
put_sample(v);
f = 100 + (((10000 - 100) * i) / FE);
a += (f * FRAC_ONE) / FE;
f = 100 + (((10000 - 100) * i) / sample_rate);
a += (f * FRAC_ONE) / sample_rate;
}
/* 0.5 second of low amplitude white noise */
for(i=0;i<FE / 2;i++) {
for(i=0;i<sample_rate / 2;i++) {
v = myrnd(&seed, 20000) - 10000;
for(j=0;j<NB_CHANNELS;j++)
for(j=0;j<nb_channels;j++)
put_sample(v);
}
/* 0.5 second of high amplitude white noise */
for(i=0;i<FE / 2;i++) {
for(i=0;i<sample_rate / 2;i++) {
v = myrnd(&seed, 65535) - 32768;
for(j=0;j<NB_CHANNELS;j++)
for(j=0;j<nb_channels;j++)
put_sample(v);
}
/* stereo : 2 unrelated ramps */
for(j=0;j<NB_CHANNELS;j++) {
/* 1 second of unrelated ramps for each channel */
for(j=0;j<nb_channels;j++) {
taba[j] = 0;
tabf1[j] = 100 + myrnd(&seed, 5000);
tabf2[j] = 100 + myrnd(&seed, 5000);
}
for(i=0;i<1 * FE;i++) {
for(j=0;j<NB_CHANNELS;j++) {
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);
f = tabf1[j] + (((tabf2[j] - tabf1[j]) * i) / FE);
taba[j] += (f * FRAC_ONE) / FE;
f = tabf1[j] + (((tabf2[j] - tabf1[j]) * i) / sample_rate);
taba[j] += (f * FRAC_ONE) / sample_rate;
}
}
/* stereo 500 Hz with varying volume */
/* 2 seconds of 500 Hz with varying volume */
a = 0;
ampa = 0;
for(i=0;i<2 * FE;i++) {
for(j=0;j<NB_CHANNELS;j++) {
for(i=0;i<2 * sample_rate;i++) {
for(j=0;j<nb_channels;j++) {
amp = ((FRAC_ONE + int_cos(ampa)) * 5000) >> FRAC_BITS;
if (j & 1)
amp = 10000 - amp;
v = (int_cos(a) * amp) >> FRAC_BITS;
put_sample(v);
a += (500 * FRAC_ONE) / FE;
ampa += (2 * FRAC_ONE) / FE;
a += (500 * FRAC_ONE) / sample_rate;
ampa += (2 * FRAC_ONE) / sample_rate;
}
}