mirror of
https://github.com/mpv-player/mpv
synced 2024-12-29 10:32:15 +00:00
d65c8518de
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9634 b3059339-0415-0410-9bf9-f77b7e298cf2
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
/* Extrastereo effect plugin
|
|
* (linearly increases difference between L&R channels)
|
|
*
|
|
* Current limitations:
|
|
* - only AFMT_S16_HE is supported currently
|
|
*
|
|
* License: GPLv2 (as a mix of pl_volume.c and
|
|
* xmms:stereo_plugin/stereo.c)
|
|
*
|
|
* Author: pl <p_l@gmx.fr> (c) 2002 and beyond...
|
|
* */
|
|
|
|
#define PLUGIN
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <inttypes.h>
|
|
|
|
#include "audio_out.h"
|
|
#include "audio_plugin.h"
|
|
#include "audio_plugin_internal.h"
|
|
#include "afmt.h"
|
|
|
|
static ao_info_t info = {
|
|
"Extra stereo plugin",
|
|
"extrastereo",
|
|
"pl <p_l@gmx.fr>",
|
|
""
|
|
};
|
|
|
|
LIBAO_PLUGIN_EXTERN(extrastereo)
|
|
|
|
// local data
|
|
static struct {
|
|
float mul; // intensity
|
|
int inuse; // This plugin is in use TRUE, FALSE
|
|
int format; // sample format
|
|
} pl_extrastereo = {2.5, 0, 0};
|
|
|
|
|
|
// to set/get/query special features/parameters
|
|
static int control(int cmd,void *arg){
|
|
switch(cmd){
|
|
case AOCONTROL_PLUGIN_SET_LEN:
|
|
return CONTROL_OK;
|
|
case AOCONTROL_PLUGIN_ES_SET:
|
|
pl_extrastereo.mul=*((float*)arg);
|
|
return CONTROL_OK;
|
|
case AOCONTROL_PLUGIN_ES_GET:
|
|
*((float*)arg)=pl_extrastereo.mul;
|
|
return CONTROL_OK;
|
|
}
|
|
return CONTROL_UNKNOWN;
|
|
}
|
|
|
|
// open & setup audio device
|
|
// return: 1=success 0=fail
|
|
static int init(){
|
|
switch(ao_plugin_data.format){
|
|
case(AFMT_S16_NE):
|
|
break;
|
|
default:
|
|
fprintf(stderr,"[pl_extrastereo] Audio format not yet suported \n");
|
|
return 0;
|
|
}
|
|
|
|
pl_extrastereo.mul=ao_plugin_cfg.pl_extrastereo_mul;
|
|
pl_extrastereo.format=ao_plugin_data.format;
|
|
pl_extrastereo.inuse=1;
|
|
|
|
printf("[pl_extrastereo] Extra stereo plugin in use (multiplier=%2.2f).\n",
|
|
pl_extrastereo.mul);
|
|
return 1;
|
|
}
|
|
|
|
// close plugin
|
|
static void uninit(){
|
|
pl_extrastereo.inuse=0;
|
|
}
|
|
|
|
// empty buffers
|
|
static void reset(){
|
|
}
|
|
|
|
// processes 'ao_plugin_data.len' bytes of 'data'
|
|
// called for every block of data
|
|
static int play(){
|
|
|
|
switch(pl_extrastereo.format){
|
|
case(AFMT_S16_NE): {
|
|
|
|
int16_t* data=(int16_t*)ao_plugin_data.data;
|
|
int len=ao_plugin_data.len / 2; // 16 bits samples
|
|
|
|
float mul = pl_extrastereo.mul;
|
|
int32_t i, avg, ltmp, rtmp;
|
|
|
|
for (i=0; i < len ; i += 2) {
|
|
|
|
avg = (data[i] + data[i + 1]) / 2;
|
|
|
|
ltmp = avg + (int) (mul * (data[i] - avg));
|
|
rtmp = avg + (int) (mul * (data[i + 1] - avg));
|
|
|
|
if (ltmp < -32768) {
|
|
ltmp = -32768;
|
|
} else if (ltmp > 32767) {
|
|
ltmp = 32767;
|
|
}
|
|
|
|
if (rtmp < -32768) {
|
|
rtmp = -32768;
|
|
} else if (rtmp > 32767) {
|
|
rtmp = 32767;
|
|
}
|
|
|
|
data[i] = ltmp;
|
|
data[i + 1] = rtmp;
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|