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Diffstat (limited to 'contrib/ffmpeg/tests/audiogen.c')
| -rw-r--r-- | contrib/ffmpeg/tests/audiogen.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/contrib/ffmpeg/tests/audiogen.c b/contrib/ffmpeg/tests/audiogen.c deleted file mode 100644 index 68ae13586..000000000 --- a/contrib/ffmpeg/tests/audiogen.c +++ /dev/null @@ -1,187 +0,0 @@ -/* - * Generates a synthetic stereo sound - * NOTE: no floats are used to guaranty a bit exact output. - * - * Copyright (c) 2002 Fabrice Bellard - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <stdlib.h> -#include <stdio.h> - -#define NB_CHANNELS 2 -#define FE 44100 - -static unsigned int myrnd(unsigned int *seed_ptr, int n) -{ - unsigned int seed, val; - - seed = *seed_ptr; - seed = (seed * 314159) + 1; - if (n == 256) { - val = seed >> 24; - } else { - val = seed % n; - } - *seed_ptr = seed; - return val; -} - -#define FRAC_BITS 16 -#define FRAC_ONE (1 << FRAC_BITS) - -#define COS_TABLE_BITS 7 - -/* integer cosinus */ -static const unsigned short cos_table[(1 << COS_TABLE_BITS) + 2] = { - 0x8000, 0x7ffe, 0x7ff6, 0x7fea, 0x7fd9, 0x7fc2, 0x7fa7, 0x7f87, - 0x7f62, 0x7f38, 0x7f0a, 0x7ed6, 0x7e9d, 0x7e60, 0x7e1e, 0x7dd6, - 0x7d8a, 0x7d3a, 0x7ce4, 0x7c89, 0x7c2a, 0x7bc6, 0x7b5d, 0x7aef, - 0x7a7d, 0x7a06, 0x798a, 0x790a, 0x7885, 0x77fb, 0x776c, 0x76d9, - 0x7642, 0x75a6, 0x7505, 0x7460, 0x73b6, 0x7308, 0x7255, 0x719e, - 0x70e3, 0x7023, 0x6f5f, 0x6e97, 0x6dca, 0x6cf9, 0x6c24, 0x6b4b, - 0x6a6e, 0x698c, 0x68a7, 0x67bd, 0x66d0, 0x65de, 0x64e9, 0x63ef, - 0x62f2, 0x61f1, 0x60ec, 0x5fe4, 0x5ed7, 0x5dc8, 0x5cb4, 0x5b9d, - 0x5a82, 0x5964, 0x5843, 0x571e, 0x55f6, 0x54ca, 0x539b, 0x5269, - 0x5134, 0x4ffb, 0x4ec0, 0x4d81, 0x4c40, 0x4afb, 0x49b4, 0x486a, - 0x471d, 0x45cd, 0x447b, 0x4326, 0x41ce, 0x4074, 0x3f17, 0x3db8, - 0x3c57, 0x3af3, 0x398d, 0x3825, 0x36ba, 0x354e, 0x33df, 0x326e, - 0x30fc, 0x2f87, 0x2e11, 0x2c99, 0x2b1f, 0x29a4, 0x2827, 0x26a8, - 0x2528, 0x23a7, 0x2224, 0x209f, 0x1f1a, 0x1d93, 0x1c0c, 0x1a83, - 0x18f9, 0x176e, 0x15e2, 0x1455, 0x12c8, 0x113a, 0x0fab, 0x0e1c, - 0x0c8c, 0x0afb, 0x096b, 0x07d9, 0x0648, 0x04b6, 0x0324, 0x0192, - 0x0000, 0x0000, -}; - -#define CSHIFT (FRAC_BITS - COS_TABLE_BITS - 2) - -static int int_cos(int a) -{ - int neg, v, f; - const unsigned short *p; - - a = a & (FRAC_ONE - 1); /* modulo 2 * pi */ - if (a >= (FRAC_ONE / 2)) - a = FRAC_ONE - a; - neg = 0; - if (a > (FRAC_ONE / 4)) { - neg = -1; - a = (FRAC_ONE / 2) - a; - } - p = cos_table + (a >> CSHIFT); - /* linear interpolation */ - f = a & ((1 << CSHIFT) - 1); - v = p[0] + (((p[1] - p[0]) * f + (1 << (CSHIFT - 1))) >> CSHIFT); - v = (v ^ neg) - neg; - v = v << (FRAC_BITS - 15); - return v; -} - -FILE *outfile; - -void put_sample(int v) -{ - fputc(v & 0xff, outfile); - fputc((v >> 8) & 0xff, outfile); -} - -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]; - - if (argc != 2) { - printf("usage: %s file\n" - "generate a test raw 16 bit stereo audio stream\n", argv[0]); - exit(1); - } - - outfile = fopen(argv[1], "wb"); - if (!outfile) { - perror(argv[1]); - return 1; - } - - /* 1 second of single freq sinus at 1000 Hz */ - a = 0; - for(i=0;i<1 * FE;i++) { - v = (int_cos(a) * 10000) >> FRAC_BITS; - for(j=0;j<NB_CHANNELS;j++) - put_sample(v); - a += (1000 * FRAC_ONE) / FE; - } - - /* 1 second of varing frequency between 100 and 10000 Hz */ - a = 0; - for(i=0;i<1 * FE;i++) { - v = (int_cos(a) * 10000) >> FRAC_BITS; - for(j=0;j<NB_CHANNELS;j++) - put_sample(v); - f = 100 + (((10000 - 100) * i) / FE); - a += (f * FRAC_ONE) / FE; - } - - /* 0.5 second of low amplitude white noise */ - for(i=0;i<FE / 2;i++) { - v = myrnd(&seed, 20000) - 10000; - 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++) { - v = myrnd(&seed, 65535) - 32768; - for(j=0;j<NB_CHANNELS;j++) - put_sample(v); - } - - /* stereo : 2 unrelated ramps */ - 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++) { - 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; - } - } - - /* stereo 500 Hz with varying volume */ - a = 0; - ampa = 0; - for(i=0;i<2 * FE;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; - } - } - - fclose(outfile); - return 0; -} |