diff options
author | wm4 <wm4@nowhere> | 2012-11-05 17:02:04 +0100 |
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committer | wm4 <wm4@nowhere> | 2012-11-12 20:06:14 +0100 |
commit | d4bdd0473d6f43132257c9fb3848d829755167a3 (patch) | |
tree | 8021c2f7da1841393c8c832105e20cd527826d6c /audio/filter/af_volume.c | |
parent | bd48deba77bd5582c5829d6fe73a7d2571088aba (diff) | |
download | mpv-d4bdd0473d6f43132257c9fb3848d829755167a3.tar.bz2 mpv-d4bdd0473d6f43132257c9fb3848d829755167a3.tar.xz |
Rename directories, move files (step 1 of 2) (does not compile)
Tis drops the silly lib prefixes, and attempts to organize the tree in
a more logical way. Make the top-level directory less cluttered as
well.
Renames the following directories:
libaf -> audio/filter
libao2 -> audio/out
libvo -> video/out
libmpdemux -> demux
Split libmpcodecs:
vf* -> video/filter
vd*, dec_video.* -> video/decode
mp_image*, img_format*, ... -> video/
ad*, dec_audio.* -> audio/decode
libaf/format.* is moved to audio/ - this is similar to how mp_image.*
is located in video/.
Move most top-level .c/.h files to core. (talloc.c/.h is left on top-
level, because it's external.) Park some of the more annoying files
in compat/. Some of these are relicts from the time mplayer used
ffmpeg internals.
sub/ is not split, because it's too much of a mess (subtitle code is
mixed with OSD display and rendering).
Maybe the organization of core is not ideal: it mixes playback core
(like mplayer.c) and utility helpers (like bstr.c/h). Should the need
arise, the playback core will be moved somewhere else, while core
contains all helper and common code.
Diffstat (limited to 'audio/filter/af_volume.c')
-rw-r--r-- | audio/filter/af_volume.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/audio/filter/af_volume.c b/audio/filter/af_volume.c new file mode 100644 index 0000000000..ecf181c8b8 --- /dev/null +++ b/audio/filter/af_volume.c @@ -0,0 +1,226 @@ +/* + * Copyright (C)2002 Anders Johansson ajh@atri.curtin.edu.au + * + * 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. + */ + +/* This audio filter changes the volume of the sound, and can be used + when the mixer doesn't support the PCM channel. It can handle + between 1 and AF_NCH channels. The volume can be adjusted between -60dB + to +20dB and is set on a per channels basis. The is accessed through + AF_CONTROL_VOLUME_LEVEL. + + The filter has support for soft-clipping, it is enabled by + AF_CONTROL_VOLUME_SOFTCLIPP. It has also a probing feature which + can be used to measure the power in the audio stream, both an + instantaneous value and the maximum value can be probed. The + probing is enable by AF_CONTROL_VOLUME_PROBE_ON_OFF and is done on a + per channel basis. The result from the probing is obtained using + AF_CONTROL_VOLUME_PROBE_GET and AF_CONTROL_VOLUME_PROBE_GET_MAX. The + probed values are calculated in dB. +*/ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <inttypes.h> +#include <math.h> +#include <limits.h> + +#include "af.h" + +// Data for specific instances of this filter +typedef struct af_volume_s +{ + int enable[AF_NCH]; // Enable/disable / channel + float pow[AF_NCH]; // Estimated power level [dB] + float max[AF_NCH]; // Max Power level [dB] + float level[AF_NCH]; // Gain level for each channel + float time; // Forgetting factor for power estimate + int soft; // Enable/disable soft clipping + int fast; // Use fix-point volume control +}af_volume_t; + +// Initialization and runtime control +static int control(struct af_instance* af, int cmd, void* arg) +{ + af_volume_t* s = (af_volume_t*)af->setup; + + switch(cmd){ + case AF_CONTROL_REINIT: + // Sanity check + if(!arg) return AF_ERROR; + + af->data->rate = ((struct mp_audio*)arg)->rate; + af->data->nch = ((struct mp_audio*)arg)->nch; + + if(s->fast && (((struct mp_audio*)arg)->format != (AF_FORMAT_FLOAT_NE))){ + af->data->format = AF_FORMAT_S16_NE; + af->data->bps = 2; + } + else{ + // Cutoff set to 10Hz for forgetting factor + float x = 2.0*M_PI*15.0/(float)af->data->rate; + float t = 2.0-cos(x); + s->time = 1.0 - (t - sqrt(t*t - 1)); + mp_msg(MSGT_AFILTER, MSGL_DBG2, "[volume] Forgetting factor = %0.5f\n",s->time); + af->data->format = AF_FORMAT_FLOAT_NE; + af->data->bps = 4; + } + return af_test_output(af,(struct mp_audio*)arg); + case AF_CONTROL_COMMAND_LINE:{ + float v=0.0; + float vol[AF_NCH]; + int i; + sscanf((char*)arg,"%f:%i", &v, &s->soft); + for(i=0;i<AF_NCH;i++) vol[i]=v; + return control(af,AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET, vol); + } + case AF_CONTROL_POST_CREATE: + s->fast = ((((struct af_cfg*)arg)->force & AF_INIT_FORMAT_MASK) == + AF_INIT_FLOAT) ? 0 : 1; + return AF_OK; + case AF_CONTROL_VOLUME_ON_OFF | AF_CONTROL_SET: + memcpy(s->enable,(int*)arg,AF_NCH*sizeof(int)); + return AF_OK; + case AF_CONTROL_VOLUME_ON_OFF | AF_CONTROL_GET: + memcpy((int*)arg,s->enable,AF_NCH*sizeof(int)); + return AF_OK; + case AF_CONTROL_VOLUME_SOFTCLIP | AF_CONTROL_SET: + s->soft = *(int*)arg; + return AF_OK; + case AF_CONTROL_VOLUME_SOFTCLIP | AF_CONTROL_GET: + *(int*)arg = s->soft; + return AF_OK; + case AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET: + return af_from_dB(AF_NCH,(float*)arg,s->level,20.0,-200.0,60.0); + case AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_GET: + return af_to_dB(AF_NCH,s->level,(float*)arg,20.0); + case AF_CONTROL_VOLUME_PROBE | AF_CONTROL_GET: + return af_to_dB(AF_NCH,s->pow,(float*)arg,10.0); + case AF_CONTROL_VOLUME_PROBE_MAX | AF_CONTROL_GET: + return af_to_dB(AF_NCH,s->max,(float*)arg,10.0); + case AF_CONTROL_PRE_DESTROY:{ + float m = 0.0; + int i; + if(!s->fast){ + for(i=0;i<AF_NCH;i++) + m=max(m,s->max[i]); + af_to_dB(1, &m, &m, 10.0); + mp_msg(MSGT_AFILTER, MSGL_INFO, "[volume] The maximum volume was %0.2fdB \n", m); + } + return AF_OK; + } + } + return AF_UNKNOWN; +} + +// Deallocate memory +static void uninit(struct af_instance* af) +{ + free(af->data); + free(af->setup); +} + +// Filter data through filter +static struct mp_audio* play(struct af_instance* af, struct mp_audio* data) +{ + struct mp_audio* c = data; // Current working data + af_volume_t* s = (af_volume_t*)af->setup; // Setup for this instance + register int nch = c->nch; // Number of channels + register int i = 0; + + // Basic operation volume control only (used on slow machines) + if(af->data->format == (AF_FORMAT_S16_NE)){ + int16_t* a = (int16_t*)c->audio; // Audio data + int len = c->len/2; // Number of samples + for (int ch = 0; ch < nch; ch++) { + int vol = 256.0 * s->level[ch]; + if (s->enable[ch] && vol != 256) { + for(i=ch;i<len;i+=nch){ + register int x = (a[i] * vol) >> 8; + a[i]=clamp(x,SHRT_MIN,SHRT_MAX); + } + } + } + } + // Machine is fast and data is floating point + else if(af->data->format == (AF_FORMAT_FLOAT_NE)){ + float* a = (float*)c->audio; // Audio data + int len = c->len/4; // Number of samples + for (int ch = 0; ch < nch; ch++) { + // Volume control (fader) + if(s->enable[ch]){ + float t = 1.0 - s->time; + for(i=ch;i<len;i+=nch){ + register float x = a[i]; + register float pow = x*x; + // Check maximum power value + if(pow > s->max[ch]) + s->max[ch] = pow; + // Set volume + x *= s->level[ch]; + // Peak meter + pow = x*x; + if(pow > s->pow[ch]) + s->pow[ch] = pow; + else + s->pow[ch] = t*s->pow[ch] + pow*s->time; // LP filter + /* Soft clipping, the sound of a dream, thanks to Jon Wattes + post to Musicdsp.org */ + if(s->soft) + x=af_softclip(x); + // Hard clipping + else + x=clamp(x,-1.0,1.0); + a[i] = x; + } + } + } + } + return c; +} + +// Allocate memory and set function pointers +static int af_open(struct af_instance* af){ + int i = 0; + af->control=control; + af->uninit=uninit; + af->play=play; + af->mul=1; + af->data=calloc(1,sizeof(struct mp_audio)); + af->setup=calloc(1,sizeof(af_volume_t)); + if(af->data == NULL || af->setup == NULL) + return AF_ERROR; + // Enable volume control and set initial volume to 0dB. + for(i=0;i<AF_NCH;i++){ + ((af_volume_t*)af->setup)->enable[i] = 1; + ((af_volume_t*)af->setup)->level[i] = 1.0; + } + return AF_OK; +} + +// Description of this filter +struct af_info af_info_volume = { + "Volume control audio filter", + "volume", + "Anders", + "", + AF_FLAGS_NOT_REENTRANT, + af_open +}; |