diff options
Diffstat (limited to 'audio/filter/af_center.c')
-rw-r--r-- | audio/filter/af_center.c | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/audio/filter/af_center.c b/audio/filter/af_center.c deleted file mode 100644 index 69e54e81c6..0000000000 --- a/audio/filter/af_center.c +++ /dev/null @@ -1,104 +0,0 @@ -/* - * This filter adds a center channel to the audio stream by - * averaging the left and right channel. - * There are two runtime controls one for setting which channel - * to insert the center-audio into called AF_CONTROL_SUB_CH. - * - * FIXME: implement a high-pass filter for better results. - * - * copyright (c) 2005 Alex Beregszaszi - * - * This file is part of mpv. - * - * mpv 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. - * - * mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "common/common.h" -#include "af.h" - -// Data for specific instances of this filter -typedef struct af_center_s -{ - int ch; // Channel number which to insert the filtered data -}af_center_t; - -// Initialization and runtime control -static int control(struct af_instance* af, int cmd, void* arg) -{ - af_center_t* s = af->priv; - - switch(cmd){ - case AF_CONTROL_REINIT:{ - // Sanity check - if(!arg) return AF_ERROR; - - af->data->rate = ((struct mp_audio*)arg)->rate; - mp_audio_set_channels_old(af->data, MPMAX(s->ch+1,((struct mp_audio*)arg)->nch)); - mp_audio_set_format(af->data, AF_FORMAT_FLOAT); - - return af_test_output(af,(struct mp_audio*)arg); - } - } - return AF_UNKNOWN; -} - -static int filter_frame(struct af_instance* af, struct mp_audio* data) -{ - if (!data) - return 0; - if (af_make_writeable(af, data) < 0) { - talloc_free(data); - return -1; - } - struct mp_audio* c = data; // Current working data - af_center_t* s = af->priv; // Setup for this instance - float* a = c->planes[0]; // Audio data - int nch = c->nch; // Number of channels - int len = c->samples*c->nch; // Number of samples in current audio block - int ch = s->ch; // Channel in which to insert the center audio - register int i; - - // Run filter - for(i=0;i<len;i+=nch){ - // Average left and right - a[i+ch] = (a[i]/2) + (a[i+1]/2); - } - - af_add_output_frame(af, data); - return 0; -} - -// Allocate memory and set function pointers -static int af_open(struct af_instance* af){ - af->control=control; - af->filter_frame = filter_frame; - return AF_OK; -} - -#define OPT_BASE_STRUCT af_center_t -const struct af_info af_info_center = { - .info = "Audio filter for adding a center channel", - .name = "center", - .flags = AF_FLAGS_NOT_REENTRANT, - .open = af_open, - .priv_size = sizeof(af_center_t), - .options = (const struct m_option[]) { - OPT_INTRANGE("channel", ch, 0, 0, AF_NCH - 1, OPTDEF_INT(1)), - {0} - }, -}; |