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@ -24,8 +24,7 @@ |
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#include <stdlib.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <stdio.h> |
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#define NB_CHANNELS 2 |
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#define MAX_CHANNELS 8 |
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#define FE 44100 |
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static unsigned int myrnd(unsigned int *seed_ptr, int n) |
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static unsigned int myrnd(unsigned int *seed_ptr, int n) |
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{ |
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{ |
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@ -104,15 +103,34 @@ int main(int argc, char **argv) |
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{ |
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{ |
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int i, a, v, j, f, amp, ampa; |
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int i, a, v, j, f, amp, ampa; |
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unsigned int seed = 1; |
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unsigned int seed = 1; |
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int tabf1[NB_CHANNELS], tabf2[NB_CHANNELS]; |
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int tabf1[MAX_CHANNELS], tabf2[MAX_CHANNELS]; |
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int taba[NB_CHANNELS]; |
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int taba[MAX_CHANNELS]; |
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int sample_rate = 44100; |
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if (argc != 2) { |
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int nb_channels = 2; |
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printf("usage: %s file\n" |
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"generate a test raw 16 bit stereo audio stream\n", argv[0]); |
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if (argc < 2 || argc > 4) { |
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printf("usage: %s file [<sample rate> [<channels>]]\n" |
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"generate a test raw 16 bit audio stream\n" |
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"default: 44100 Hz stereo\n", argv[0]); |
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exit(1); |
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exit(1); |
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} |
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} |
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if (argc > 2) { |
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sample_rate = atoi(argv[2]); |
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if (sample_rate <= 0) { |
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fprintf(stderr, "invalid sample rate: %d\n", sample_rate); |
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return 1; |
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} |
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} |
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if (argc > 3) { |
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nb_channels = atoi(argv[3]); |
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if (nb_channels < 1 || nb_channels > MAX_CHANNELS) { |
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fprintf(stderr, "invalid number of channels: %d\n", nb_channels); |
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return 1; |
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} |
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} |
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outfile = fopen(argv[1], "wb"); |
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outfile = fopen(argv[1], "wb"); |
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if (!outfile) { |
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if (!outfile) { |
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perror(argv[1]); |
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perror(argv[1]); |
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@ -121,64 +139,64 @@ int main(int argc, char **argv) |
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/* 1 second of single freq sinus at 1000 Hz */ |
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/* 1 second of single freq sinus at 1000 Hz */ |
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a = 0; |
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a = 0; |
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for(i=0;i<1 * FE;i++) { |
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for(i=0;i<1 * sample_rate;i++) { |
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v = (int_cos(a) * 10000) >> FRAC_BITS; |
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v = (int_cos(a) * 10000) >> FRAC_BITS; |
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for(j=0;j<NB_CHANNELS;j++) |
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for(j=0;j<nb_channels;j++) |
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put_sample(v); |
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put_sample(v); |
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a += (1000 * FRAC_ONE) / FE; |
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a += (1000 * FRAC_ONE) / sample_rate; |
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} |
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} |
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/* 1 second of varing frequency between 100 and 10000 Hz */ |
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/* 1 second of varing frequency between 100 and 10000 Hz */ |
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a = 0; |
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a = 0; |
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for(i=0;i<1 * FE;i++) { |
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for(i=0;i<1 * sample_rate;i++) { |
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v = (int_cos(a) * 10000) >> FRAC_BITS; |
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v = (int_cos(a) * 10000) >> FRAC_BITS; |
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for(j=0;j<NB_CHANNELS;j++) |
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for(j=0;j<nb_channels;j++) |
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put_sample(v); |
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put_sample(v); |
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f = 100 + (((10000 - 100) * i) / FE); |
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f = 100 + (((10000 - 100) * i) / sample_rate); |
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a += (f * FRAC_ONE) / FE; |
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a += (f * FRAC_ONE) / sample_rate; |
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} |
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} |
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/* 0.5 second of low amplitude white noise */ |
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/* 0.5 second of low amplitude white noise */ |
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for(i=0;i<FE / 2;i++) { |
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for(i=0;i<sample_rate / 2;i++) { |
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v = myrnd(&seed, 20000) - 10000; |
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v = myrnd(&seed, 20000) - 10000; |
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for(j=0;j<NB_CHANNELS;j++) |
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for(j=0;j<nb_channels;j++) |
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put_sample(v); |
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put_sample(v); |
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} |
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} |
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/* 0.5 second of high amplitude white noise */ |
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/* 0.5 second of high amplitude white noise */ |
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for(i=0;i<FE / 2;i++) { |
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for(i=0;i<sample_rate / 2;i++) { |
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v = myrnd(&seed, 65535) - 32768; |
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v = myrnd(&seed, 65535) - 32768; |
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for(j=0;j<NB_CHANNELS;j++) |
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for(j=0;j<nb_channels;j++) |
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put_sample(v); |
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put_sample(v); |
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} |
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} |
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/* stereo : 2 unrelated ramps */ |
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/* 1 second of unrelated ramps for each channel */ |
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for(j=0;j<NB_CHANNELS;j++) { |
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for(j=0;j<nb_channels;j++) { |
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taba[j] = 0; |
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taba[j] = 0; |
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tabf1[j] = 100 + myrnd(&seed, 5000); |
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tabf1[j] = 100 + myrnd(&seed, 5000); |
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tabf2[j] = 100 + myrnd(&seed, 5000); |
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tabf2[j] = 100 + myrnd(&seed, 5000); |
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} |
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} |
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for(i=0;i<1 * FE;i++) { |
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for(i=0;i<1 * sample_rate;i++) { |
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for(j=0;j<NB_CHANNELS;j++) { |
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for(j=0;j<nb_channels;j++) { |
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v = (int_cos(taba[j]) * 10000) >> FRAC_BITS; |
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v = (int_cos(taba[j]) * 10000) >> FRAC_BITS; |
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put_sample(v); |
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put_sample(v); |
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f = tabf1[j] + (((tabf2[j] - tabf1[j]) * i) / FE); |
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f = tabf1[j] + (((tabf2[j] - tabf1[j]) * i) / sample_rate); |
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taba[j] += (f * FRAC_ONE) / FE; |
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taba[j] += (f * FRAC_ONE) / sample_rate; |
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} |
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} |
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} |
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} |
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/* stereo 500 Hz with varying volume */ |
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/* 2 seconds of 500 Hz with varying volume */ |
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a = 0; |
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a = 0; |
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ampa = 0; |
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ampa = 0; |
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for(i=0;i<2 * FE;i++) { |
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for(i=0;i<2 * sample_rate;i++) { |
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for(j=0;j<NB_CHANNELS;j++) { |
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for(j=0;j<nb_channels;j++) { |
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amp = ((FRAC_ONE + int_cos(ampa)) * 5000) >> FRAC_BITS; |
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amp = ((FRAC_ONE + int_cos(ampa)) * 5000) >> FRAC_BITS; |
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if (j & 1) |
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if (j & 1) |
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amp = 10000 - amp; |
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amp = 10000 - amp; |
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v = (int_cos(a) * amp) >> FRAC_BITS; |
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v = (int_cos(a) * amp) >> FRAC_BITS; |
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put_sample(v); |
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put_sample(v); |
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a += (500 * FRAC_ONE) / FE; |
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a += (500 * FRAC_ONE) / sample_rate; |
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ampa += (2 * FRAC_ONE) / FE; |
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ampa += (2 * FRAC_ONE) / sample_rate; |
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} |
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} |
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} |
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} |
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