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author | wm4 <wm4@nowhere> | 2013-11-18 18:48:00 +0100 |
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committer | wm4 <wm4@nowhere> | 2013-11-18 18:48:00 +0100 |
commit | 85f6349c78804ea662606fc859d2f376bfdfe606 (patch) | |
tree | d476b44144db75af502c4f03b7ae05e6a67e7cea /audio/filter/tools.c | |
parent | 82068ec56cb45eca1f5b02d5e943ade27c919867 (diff) | |
download | mpv-85f6349c78804ea662606fc859d2f376bfdfe606.tar.bz2 mpv-85f6349c78804ea662606fc859d2f376bfdfe606.tar.xz |
audio/filter: rename af_tools.c to tools.c
This always bothered me.
Diffstat (limited to 'audio/filter/tools.c')
-rw-r--r-- | audio/filter/tools.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/audio/filter/tools.c b/audio/filter/tools.c new file mode 100644 index 0000000000..c5f423ebf9 --- /dev/null +++ b/audio/filter/tools.c @@ -0,0 +1,123 @@ +/* + * This file is part of MPlayer. + * + * MPlayer is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * MPlayer 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 General Public License along + * with MPlayer; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <math.h> +#include <string.h> + +#include "mpvcore/mp_common.h" +#include "af.h" + +/* Convert to gain value from dB. Returns AF_OK if of and AF_ERROR if + * fail. input <= -200dB will become 0 gain. */ +int af_from_dB(int n, float* in, float* out, float k, float mi, float ma) +{ + int i = 0; + // Sanity check + if(!in || !out) + return AF_ERROR; + + for(i=0;i<n;i++){ + if(in[i]<=-200) + out[i]=0.0; + else + out[i]=pow(10.0,MPCLAMP(in[i],mi,ma)/k); + } + return AF_OK; +} + +/* Convert from gain value to dB. Returns AF_OK if of and AF_ERROR if + * fail. gain=0 will become -200 dB. k is just a multiplier. */ +int af_to_dB(int n, float* in, float* out, float k) +{ + int i = 0; + // Sanity check + if(!in || !out) + return AF_ERROR; + + for(i=0;i<n;i++){ + if(in[i] == 0.0) + out[i]=-200.0; + else + out[i]=k*log10(in[i]); + } + return AF_OK; +} + +/* Convert from ms to sample time */ +int af_from_ms(int n, float* in, int* out, int rate, float mi, float ma) +{ + int i = 0; + // Sanity check + if(!in || !out) + return AF_ERROR; + + for(i=0;i<n;i++) + out[i]=(int)((float)rate * MPCLAMP(in[i],mi,ma)/1000.0); + + return AF_OK; +} + +/* Convert from sample time to ms */ +int af_to_ms(int n, int* in, float* out, int rate) +{ + int i = 0; + // Sanity check + if(!in || !out || !rate) + return AF_ERROR; + + for(i=0;i<n;i++) + out[i]=1000.0 * (float)in[i]/((float)rate); + + return AF_OK; +} + +/* + * test if output format matches + * af: audio filter + * out: needed format, will be overwritten by available + * format if they do not match + * returns: AF_FALSE if formats do not match, AF_OK if they match + * + * compares the format, rate and nch values of af->data with out + * Note: logically, *out=*af->data always happens, because out contains the + * format only, no actual audio data or memory allocations. *out always + * contains the parameters from af->data after the function returns. + */ +int af_test_output(struct af_instance* af, struct mp_audio* out) +{ + if((af->data->format != out->format) || + (af->data->bps != out->bps) || + (af->data->rate != out->rate) || + !mp_chmap_equals(&af->data->channels, &out->channels)){ + *out = *af->data; + return AF_FALSE; + } + return AF_OK; +} + +/* Soft clipping, the sound of a dream, thanks to Jon Wattes + post to Musicdsp.org */ +float af_softclip(float a) +{ + if (a >= M_PI/2) + return 1.0; + else if (a <= -M_PI/2) + return -1.0; + else + return sin(a); +} |