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Adding audio filter to a media
Posted: 30 Sep 2014 17:17
by drich42
Hi, I'm simply trying to add an audio filter to a media_t, but it doesn't seem to work.
Here is my code :
Code: Select all
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <vlc/libvlc.h>
#include <vlc/libvlc_media.h>
#include <vlc/libvlc_media_player.h>
#include <vlc/libvlc_events.h>
#include <vlc/libvlc_version.h>
int main(int ac, char** av)
{
const char* args[] = {
"--verbose=11111",
"--no-plugins-cache",
"--audio-filter=dspa",
};
libvlc_instance_t* instance = libvlc_new( sizeof(args) / sizeof(*args), args );
libvlc_media_player_t* player = libvlc_media_player_new( instance );
libvlc_media_t* media = libvlc_media_new_path( instance, av[1] );
libvlc_media_add_option_flag(media, ":audio", libvlc_media_option_trusted);
libvlc_media_add_option_flag(media, ":audio-filter=dspa", libvlc_media_option_trusted);
libvlc_media_player_set_media( player, media );
libvlc_media_player_play( player );
while(1);
return 0;
}
It just doesn't add the filter, and there's nothing about it in the log
I didn't find anything on the web about this kind of problem, I suppose the solution will be very easy but didn't find it
Thank you
Re: Adding audio filter to a media
Posted: 30 Sep 2014 19:35
by Rémi Denis-Courmont
There are currently no ways to insert custom audio filters with LibVLC, except for the equalizer.
Re: Adding audio filter to a media
Posted: 30 Sep 2014 20:06
by drich42
How does VLC binary itself do it so ?
Re: Adding audio filter to a media
Posted: 30 Sep 2014 20:14
by Rémi Denis-Courmont
The VLC binary uses libvlccore, not libvlc.
Re: Adding audio filter to a media
Posted: 02 Oct 2014 02:27
by drich42
Thank you I found a workaround using vlccore.
I post the code in the case someone needs it :
Code: Select all
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <vlc/libvlc.h>
#include <vlc/libvlc_media.h>
#include <vlc/libvlc_media_player.h>
#include <vlc/libvlc_events.h>
#include <vlc/libvlc_version.h>
#include "dsp.h"
void callback(signed short* samples, int nb_channels, int nb_samples)
{
}
int main(int ac, char** av)
{
char* args[] = {
"--verbose=11111",
"--no-plugins-cache",
"--audio-filter=dsp",
"--dsp-callback=0",
};
char str_cb[64];
sprintf(str_cb, "--dsp-callback=%16p", &callback);
args[3] = str_cb;
libvlc_instance_t* instance = libvlc_new( sizeof(args) / sizeof(*args), (const char**)args );
libvlc_media_player_t* player = libvlc_media_player_new( instance );
libvlc_media_t* media = libvlc_media_new_path( instance, av[1] );
libvlc_media_player_set_media( player, media );
if ( player->input.p_resource != 0 ) {
audio_output_t *aout = input_resource_GetAout( player->input.p_resource );
if ( aout != 0 ) {
var_Create( (vlc_object_t*)aout, "audio-filter", 0x0040 /*VLC_VAR_STRING*/ );
vlc_value_t val;
val.psz_string = (char*)"dsp";
var_SetChecked( (vlc_object_t*)aout, "audio-filter", 0x0040 /*VLC_VAR_STRING*/, val );
aout->event.restart_request( aout, 1 /*AOUT_RESTART_FILTERS*/ );
input_resource_PutAout( player->input.p_resource, aout );
}
}
libvlc_media_player_play( player );
while(1);
return 0;
}
Re: Adding audio filter to a media
Posted: 30 Nov 2014 10:39
by MidnightCoder
@Rémi Denis-Courmont,
Was there any reason to disable libvlc clients from using any audio filter beside the Equalizer? Is it possible to open up new DLL entries similar to libvlc_media_player_set_equalizer so that other filters can be used w/ libvlc?
Re: Adding audio filter to a media
Posted: 30 Nov 2014 10:46
by Rémi Denis-Courmont
Not possible so far.
Re: Adding audio filter to a media
Posted: 13 Nov 2015 10:33
by ppcat
Great!
Can I add 2 filters using this method?
Re: Adding audio filter to a media
Posted: 25 Nov 2015 17:36
by Jean-Baptiste Kempf
Yes, using ","