added first version of regression tests - simply type 'make test' to test every codec...
[libav.git] / tests / audiogen.c
CommitLineData
51133a7d
FB
1/*
2 * Generates a synthetic stereo sound
3 * NOTE: no floats are used to guaranty a bit exact output.
4 */
5#include <stdlib.h>
6#include <stdio.h>
7
8#define NB_CHANNELS 2
9#define FE 44100
10
11static unsigned int myrnd(unsigned int *seed_ptr, int n)
12{
13 unsigned int seed, val;
14
15 seed = *seed_ptr;
16 seed = (seed * 314159) + 1;
17 if (n == 256) {
18 val = seed >> 24;
19 } else {
20 val = seed % n;
21 }
22 *seed_ptr = seed;
23 return val;
24}
25
26#define FRAC_BITS 16
27#define FRAC_ONE (1 << FRAC_BITS)
28
29#define COS_TABLE_BITS 7
30
31/* integer cosinus */
32static const unsigned short cos_table[(1 << COS_TABLE_BITS) + 2] = {
33 0x8000, 0x7ffe, 0x7ff6, 0x7fea, 0x7fd9, 0x7fc2, 0x7fa7, 0x7f87,
34 0x7f62, 0x7f38, 0x7f0a, 0x7ed6, 0x7e9d, 0x7e60, 0x7e1e, 0x7dd6,
35 0x7d8a, 0x7d3a, 0x7ce4, 0x7c89, 0x7c2a, 0x7bc6, 0x7b5d, 0x7aef,
36 0x7a7d, 0x7a06, 0x798a, 0x790a, 0x7885, 0x77fb, 0x776c, 0x76d9,
37 0x7642, 0x75a6, 0x7505, 0x7460, 0x73b6, 0x7308, 0x7255, 0x719e,
38 0x70e3, 0x7023, 0x6f5f, 0x6e97, 0x6dca, 0x6cf9, 0x6c24, 0x6b4b,
39 0x6a6e, 0x698c, 0x68a7, 0x67bd, 0x66d0, 0x65de, 0x64e9, 0x63ef,
40 0x62f2, 0x61f1, 0x60ec, 0x5fe4, 0x5ed7, 0x5dc8, 0x5cb4, 0x5b9d,
41 0x5a82, 0x5964, 0x5843, 0x571e, 0x55f6, 0x54ca, 0x539b, 0x5269,
42 0x5134, 0x4ffb, 0x4ec0, 0x4d81, 0x4c40, 0x4afb, 0x49b4, 0x486a,
43 0x471d, 0x45cd, 0x447b, 0x4326, 0x41ce, 0x4074, 0x3f17, 0x3db8,
44 0x3c57, 0x3af3, 0x398d, 0x3825, 0x36ba, 0x354e, 0x33df, 0x326e,
45 0x30fc, 0x2f87, 0x2e11, 0x2c99, 0x2b1f, 0x29a4, 0x2827, 0x26a8,
46 0x2528, 0x23a7, 0x2224, 0x209f, 0x1f1a, 0x1d93, 0x1c0c, 0x1a83,
47 0x18f9, 0x176e, 0x15e2, 0x1455, 0x12c8, 0x113a, 0x0fab, 0x0e1c,
48 0x0c8c, 0x0afb, 0x096b, 0x07d9, 0x0648, 0x04b6, 0x0324, 0x0192,
49 0x0000, 0x0000,
50};
51
52#define CSHIFT (FRAC_BITS - COS_TABLE_BITS - 2)
53
54static int int_cos(int a)
55{
56 int neg, v, f;
57 const unsigned short *p;
58
59 a = a & (FRAC_ONE - 1); /* modulo 2 * pi */
60 if (a >= (FRAC_ONE / 2))
61 a = FRAC_ONE - a;
62 neg = 0;
63 if (a > (FRAC_ONE / 4)) {
64 neg = -1;
65 a = (FRAC_ONE / 2) - a;
66 }
67 p = cos_table + (a >> CSHIFT);
68 /* linear interpolation */
69 f = a & ((1 << CSHIFT) - 1);
70 v = p[0] + (((p[1] - p[0]) * f + (1 << (CSHIFT - 1))) >> CSHIFT);
71 v = (v ^ neg) - neg;
72 v = v << (FRAC_BITS - 15);
73 return v;
74}
75
76FILE *outfile;
77
78void put_sample(int v)
79{
80 fputc(v & 0xff, outfile);
81 fputc((v >> 8) & 0xff, outfile);
82}
83
84int main(int argc, char **argv)
85{
86 int i, a, v, j, f, amp, ampa;
87 unsigned int seed = 1;
88 int tabf1[NB_CHANNELS], tabf2[NB_CHANNELS];
89 int taba[NB_CHANNELS];
90
91 if (argc != 2) {
92 printf("usage: %s file\n"
93 "generate a test raw 16 bit stereo audio stream\n", argv[0]);
94 exit(1);
95 }
96
97 outfile = fopen(argv[1], "w");
98 if (!outfile) {
99 perror(argv[1]);
100 return 1;
101 }
102
103 /* 1 second of single freq sinus at 1000 Hz */
104 a = 0;
105 for(i=0;i<1 * FE;i++) {
106 v = (int_cos(a) * 10000) >> FRAC_BITS;
107 for(j=0;j<NB_CHANNELS;j++)
108 put_sample(v);
109 a += (1000 * FRAC_ONE) / FE;
110 }
111
112 /* 1 second of varing frequency between 100 and 10000 Hz */
113 a = 0;
114 for(i=0;i<1 * FE;i++) {
115 v = (int_cos(a) * 10000) >> FRAC_BITS;
116 for(j=0;j<NB_CHANNELS;j++)
117 put_sample(v);
118 f = 100 + (((10000 - 100) * i) / FE);
119 a += (f * FRAC_ONE) / FE;
120 }
121
122 /* 0.5 second of low amplitude white noise */
123 for(i=0;i<FE / 2;i++) {
124 v = myrnd(&seed, 20000) - 10000;
125 for(j=0;j<NB_CHANNELS;j++)
126 put_sample(v);
127 }
128
129 /* 0.5 second of high amplitude white noise */
130 for(i=0;i<FE / 2;i++) {
131 v = myrnd(&seed, 65535) - 32768;
132 for(j=0;j<NB_CHANNELS;j++)
133 put_sample(v);
134 }
135
136 /* stereo : 2 unrelated ramps */
137 for(j=0;j<NB_CHANNELS;j++) {
138 taba[j] = 0;
139 tabf1[j] = 100 + myrnd(&seed, 5000);
140 tabf2[j] = 100 + myrnd(&seed, 5000);
141 }
142 for(i=0;i<1 * FE;i++) {
143 for(j=0;j<NB_CHANNELS;j++) {
144 v = (int_cos(taba[j]) * 10000) >> FRAC_BITS;
145 put_sample(v);
146 f = tabf1[j] + (((tabf2[j] - tabf1[j]) * i) / FE);
147 taba[j] += (f * FRAC_ONE) / FE;
148 }
149 }
150
151 /* stereo 500 Hz with varying volume */
152 a = 0;
153 ampa = 0;
154 for(i=0;i<2 * FE;i++) {
155 for(j=0;j<NB_CHANNELS;j++) {
156 amp = ((FRAC_ONE + int_cos(ampa)) * 5000) >> FRAC_BITS;
157 if (j & 1)
158 amp = 10000 - amp;
159 v = (int_cos(a) * amp) >> FRAC_BITS;
160 put_sample(v);
161 a += (500 * FRAC_ONE) / FE;
162 ampa += (2 * FRAC_ONE) / FE;
163 }
164 }
165
166 fclose(outfile);
167 return 0;
168}