diff options
Diffstat (limited to 'src/tests/voltest.c')
| -rw-r--r-- | src/tests/voltest.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/tests/voltest.c b/src/tests/voltest.c index 2dcfa53c..551f7ecd 100644 --- a/src/tests/voltest.c +++ b/src/tests/voltest.c @@ -1,13 +1,40 @@ +/*** + This file is part of PulseAudio. + + PulseAudio 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. + + PulseAudio 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 + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + #include <stdio.h> #include <pulse/volume.h> #include <pulse/gccmacro.h> +#include <pulsecore/macro.h> + int main(int argc, char *argv[]) { pa_volume_t v; pa_cvolume cv; float b; pa_channel_map map; + pa_volume_t md = 0; + unsigned mdn = 0; printf("Attenuation of sample 1 against 32767: %g dB\n", 20.0*log10(1.0/32767.0)); printf("Smallest possible attenutation > 0 applied to 32767: %li\n", lrint(32767.0*pa_sw_volume_to_linear(1))); @@ -60,5 +87,48 @@ int main(int argc, char *argv[]) { printf("After: volume: [%s]; balance: %2.1f (intended: %2.1f) %s\n", pa_cvolume_snprint(s, sizeof(s), &r), k, b, k < b-.05 || k > b+.5 ? "MISMATCH" : ""); } + for (v = PA_VOLUME_MUTED; v <= PA_VOLUME_NORM*2; v += 51) { + + double l = pa_sw_volume_to_linear(v); + pa_volume_t k = pa_sw_volume_from_linear(l); + double db = pa_sw_volume_to_dB(v); + pa_volume_t r = pa_sw_volume_from_dB(db); + pa_volume_t w; + + pa_assert(k == v); + pa_assert(r == v); + + for (w = PA_VOLUME_MUTED; w < PA_VOLUME_NORM*2; w += 37) { + + double t = pa_sw_volume_to_linear(w); + double db2 = pa_sw_volume_to_dB(w); + pa_volume_t p, p1, p2; + double q, qq; + + p = pa_sw_volume_multiply(v, w); + qq = db + db2; + p2 = pa_sw_volume_from_dB(qq); + q = l*t; + p1 = pa_sw_volume_from_linear(q); + + if (p2 > p && p2 - p > md) + md = p2 - p; + if (p2 < p && p - p2 > md) + md = p - p2; + if (p1 > p && p1 - p > md) + md = p1 - p; + if (p1 < p && p - p1 > md) + md = p - p1; + + if (p1 != p || p2 != p) + mdn++; + } + } + + printf("max deviation: %lu n=%lu\n", (unsigned long) md, (unsigned long) mdn); + + pa_assert(md <= 1); + pa_assert(mdn <= 251); + return 0; } |