mirror of https://github.com/mpv-player/mpv
122 lines
2.4 KiB
C
122 lines
2.4 KiB
C
/* Extrastereo effect plugin
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* (linearly increases difference between L&R channels)
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*
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* Current limitations:
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* - only AFMT_S16_LE is supported currently
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*
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* License: GPLv2 (as a mix of pl_volume.c and
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* xmms:stereo_plugin/stereo.c)
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*
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* Author: pl <p_l@gmx.fr> (c) 2002 and beyond...
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* */
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#define PLUGIN
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#include <stdio.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include "audio_out.h"
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#include "audio_plugin.h"
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#include "audio_plugin_internal.h"
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#include "afmt.h"
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static ao_info_t info = {
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"Extra stereo plugin",
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"extrastereo",
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"pl <p_l@gmx.fr>",
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""
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};
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LIBAO_PLUGIN_EXTERN(extrastereo)
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// local data
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static struct {
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float mul; // intensity
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int inuse; // This plugin is in use TRUE, FALSE
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int format; // sample format
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} pl_extrastereo = {2.5, 0, 0};
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// to set/get/query special features/parameters
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static int control(int cmd,int arg){
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switch(cmd){
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case AOCONTROL_PLUGIN_SET_LEN:
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return CONTROL_OK;
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}
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return CONTROL_UNKNOWN;
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}
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// open & setup audio device
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// return: 1=success 0=fail
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static int init(){
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switch(ao_plugin_data.format){
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case(AFMT_S16_LE):
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break;
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default:
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fprintf(stderr,"[pl_extrastereo] Audio format not yet suported \n");
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return 0;
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}
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pl_extrastereo.mul=ao_plugin_cfg.pl_extrastereo_mul;
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pl_extrastereo.format=ao_plugin_data.format;
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pl_extrastereo.inuse=1;
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printf("[pl_extrastereo] Extra stereo plugin in use (multiplier=%2.2f).\n",
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pl_extrastereo.mul);
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return 1;
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}
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// close plugin
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static void uninit(){
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pl_extrastereo.inuse=0;
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}
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// empty buffers
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static void reset(){
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}
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// processes 'ao_plugin_data.len' bytes of 'data'
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// called for every block of data
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static int play(){
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switch(pl_extrastereo.format){
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case(AFMT_S16_LE): {
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int16_t* data=(int16_t*)ao_plugin_data.data;
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int len=ao_plugin_data.len / 2; // 16 bits samples
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float mul = pl_extrastereo.mul;
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int32_t i, avg, ltmp, rtmp;
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for (i=0; i < len ; i += 2) {
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avg = (data[i] + data[i + 1]) / 2;
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ltmp = avg + (int) (mul * (data[i] - avg));
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rtmp = avg + (int) (mul * (data[i + 1] - avg));
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if (ltmp < -32768) {
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ltmp = -32768;
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} else if (ltmp > 32767) {
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ltmp = 32767;
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}
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if (rtmp < -32768) {
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rtmp = -32768;
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} else if (rtmp > 32767) {
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rtmp = 32767;
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}
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data[i] = ltmp;
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data[i + 1] = rtmp;
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}
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break;
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}
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default:
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return 0;
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}
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return 1;
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}
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