mirror of
https://github.com/mpv-player/mpv
synced 2024-12-17 20:34:58 +00:00
d30a992d15
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@12009 b3059339-0415-0410-9bf9-f77b7e298cf2
187 lines
4.7 KiB
C
187 lines
4.7 KiB
C
/*=============================================================================
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//
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// This software has been released under the terms of the GNU Public
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// license. See http://www.gnu.org/copyleft/gpl.html for details.
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//
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// Copyright 2002 Anders Johansson ajh@atri.curtin.edu.au
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//
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//=============================================================================
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*/
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/* */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <math.h>
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#include <limits.h>
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#include "af.h"
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// Data for specific instances of this filter
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typedef struct af_pan_s
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{
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float level[AF_NCH][AF_NCH]; // Gain level for each channel
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}af_pan_t;
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// Initialization and runtime control
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static int control(struct af_instance_s* af, int cmd, void* arg)
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{
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af_pan_t* s = af->setup;
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switch(cmd){
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case AF_CONTROL_REINIT:
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// Sanity check
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if(!arg) return AF_ERROR;
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af->data->rate = ((af_data_t*)arg)->rate;
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af->data->format = AF_FORMAT_F | AF_FORMAT_NE;
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af->data->bps = 4;
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af->mul.n = af->data->nch;
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af->mul.d = ((af_data_t*)arg)->nch;
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if((af->data->format != ((af_data_t*)arg)->format) ||
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(af->data->bps != ((af_data_t*)arg)->bps)){
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((af_data_t*)arg)->format = af->data->format;
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((af_data_t*)arg)->bps = af->data->bps;
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return AF_FALSE;
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}
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return control(af,AF_CONTROL_PAN_NOUT | AF_CONTROL_SET, &af->data->nch);
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case AF_CONTROL_COMMAND_LINE:{
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int nch = 0;
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int n = 0;
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char* cp = NULL;
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int j,k;
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// Read number of outputs
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sscanf((char*)arg,"%i%n", &nch,&n);
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if(AF_OK != control(af,AF_CONTROL_PAN_NOUT | AF_CONTROL_SET, &nch))
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return AF_ERROR;
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// Read pan values
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cp = &((char*)arg)[n];
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j = 0; k = 0;
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while((*cp == ':') && (k < AF_NCH)){
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sscanf(cp, ":%f%n" , &s->level[k][j], &n);
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s->level[k][j] = clamp(s->level[k][j],0.0,1.0);
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af_msg(AF_MSG_VERBOSE,"[pan] Pan level from channel %i to"
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" channel %i = %f\n",j,k,s->level[k][j]);
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cp =&cp[n];
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j++;
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if(j>=nch){
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j = 0;
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k++;
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}
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}
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return AF_OK;
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}
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case AF_CONTROL_PAN_LEVEL | AF_CONTROL_SET:{
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int i;
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int ch = ((af_control_ext_t*)arg)->ch;
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float* level = ((af_control_ext_t*)arg)->arg;
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for(i=0;i<AF_NCH;i++)
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s->level[ch][i] = clamp(level[i],0.0,1.0);
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return AF_OK;
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}
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case AF_CONTROL_PAN_LEVEL | AF_CONTROL_GET:{
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int i;
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int ch = ((af_control_ext_t*)arg)->ch;
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float* level = ((af_control_ext_t*)arg)->arg;
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for(i=0;i<AF_NCH;i++)
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level[i] = s->level[ch][i];
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return AF_OK;
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}
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case AF_CONTROL_PAN_NOUT | AF_CONTROL_SET:
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// Reinit must be called after this function has been called
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// Sanity check
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if(((int*)arg)[0] <= 0 || ((int*)arg)[0] > AF_NCH){
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af_msg(AF_MSG_ERROR,"[pan] The number of output channels must be"
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" between 1 and %i. Current value is %i\n",AF_NCH,((int*)arg)[0]);
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return AF_ERROR;
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}
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af->data->nch=((int*)arg)[0];
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return AF_OK;
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case AF_CONTROL_PAN_NOUT | AF_CONTROL_GET:
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*(int*)arg = af->data->nch;
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return AF_OK;
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}
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return AF_UNKNOWN;
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}
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// Deallocate memory
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static void uninit(struct af_instance_s* af)
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{
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if(af->data->audio)
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free(af->data->audio);
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if(af->data)
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free(af->data);
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if(af->setup)
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free(af->setup);
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}
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// Filter data through filter
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static af_data_t* play(struct af_instance_s* af, af_data_t* data)
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{
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af_data_t* c = data; // Current working data
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af_data_t* l = af->data; // Local data
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af_pan_t* s = af->setup; // Setup for this instance
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float* in = c->audio; // Input audio data
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float* out = NULL; // Output audio data
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float* end = in+c->len/4; // End of loop
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int nchi = c->nch; // Number of input channels
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int ncho = l->nch; // Number of output channels
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register int j,k;
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if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
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return NULL;
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out = l->audio;
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// Execute panning
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// FIXME: Too slow
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while(in < end){
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for(j=0;j<ncho;j++){
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register float x = 0.0;
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register float* tin = in;
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for(k=0;k<nchi;k++)
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x += tin[k] * s->level[j][k];
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out[j] = x;
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}
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out+= ncho;
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in+= nchi;
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}
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// Set output data
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c->audio = l->audio;
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c->len = (c->len*af->mul.n)/af->mul.d;
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c->nch = l->nch;
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return c;
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}
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// Allocate memory and set function pointers
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static int open(af_instance_t* af){
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af->control=control;
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af->uninit=uninit;
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af->play=play;
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af->mul.n=1;
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af->mul.d=1;
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af->data=calloc(1,sizeof(af_data_t));
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af->setup=calloc(1,sizeof(af_pan_t));
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if(af->data == NULL || af->setup == NULL)
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return AF_ERROR;
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// Set initial pan to pass-through.
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return AF_OK;
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}
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// Description of this filter
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af_info_t af_info_pan = {
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"Panning audio filter",
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"pan",
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"Anders",
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"",
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AF_FLAGS_NOT_REENTRANT,
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open
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};
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