audio/filter: remove some useless filters

All of these filters are considered not useful anymore by us. Some have
replacements in libavfilter (useable through af_lavfi).

af_center, af_extrastereo, af_karaoke, af_sinesuppress, af_sub,
af_surround, af_sweep: pretty simple and useless filters which probably
nobody ever wants.

af_ladspa: has a replacement in libavfilter.

af_hrtf: the algorithm doesn't work properly on most sources, and the
implementation was buggy and complicated. (The filter was inherited from
MPlayer; but even in mpv times we had to apply fixes that fixed major
issues with added noise.) There is a ladspa filter if you still want to
use it.

af_export: I'm not even sure what this is supposed to do. Possibly it
was meant for GUIs rendering audio visualizations, but it couldn't
really work well. For example, the size of the audio depended on the
samplerate (fixed number of samples only), and it couldn't retrieve the
complete audio, only fragments. If this is really needed for GUIs, mpv
should add native visualization, or a proper API for it.

1 files changed, 0 insertions, 117 deletions

diff --git a/audio/filter/af_sinesuppress.c b/audio/filter/af_sinesuppress.c
deleted file mode 100644
index 2418262f5d..0000000000
--- a/audio/filter/af_sinesuppress.c
+++ /dev/null
@@ -1,117 +0,0 @@
-/*
- * Copyright (C) 2006 Michael Niedermayer
- * Copyright (C) 2004 Alex Beregszaszi
- * based upon af_extrastereo.c by Pierre Lombard
- *
- * 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 <inttypes.h>
-#include <math.h>
-#include <limits.h>
-
-#include "af.h"
-
-// Data for specific instances of this filter
-typedef struct af_sinesuppress_s
-{
-    double freq;
-    double decay;
-    double real;
-    double imag;
-    double ref;
-    double pos;
-}af_sinesuppress_t;
-
-// Initialization and runtime control
-static int control(struct af_instance* af, int cmd, void* arg)
-{
-  switch(cmd){
-  case AF_CONTROL_REINIT:{
-    // Sanity check
-    if(!arg) return AF_ERROR;
-
-    mp_audio_copy_config(af->data, (struct mp_audio*)arg);
-    mp_audio_set_num_channels(af->data, 1);
-    mp_audio_set_format(af->data, AF_FORMAT_S16);
-
-    return af_test_output(af,(struct mp_audio*)arg);
-  }
-  }
-  return AF_UNKNOWN;
-}
-
-static int play_s16(struct af_instance *af, struct mp_audio *data)
-{
-  if (!data)
-    return 0;
-  if (af_make_writeable(af, data) < 0) {
-    talloc_free(data);
-    return -1;
-  }
-
-  af_sinesuppress_t *s = af->priv;
-  register int i = 0;
-  int16_t *a = (int16_t*)data->planes[0];       // Audio data
-  int len = data->samples*data->nch;            // Number of samples
-
-  for (i = 0; i < len; i++)
-  {
-    double co= cos(s->pos);
-    double si= sin(s->pos);
-
-    s->real += co * a[i];
-    s->imag += si * a[i];
-    s->ref  += co * co;
-
-    a[i] -= (s->real * co + s->imag * si) / s->ref;
-
-    s->real -= s->real * s->decay;
-    s->imag -= s->imag * s->decay;
-    s->ref  -= s->ref  * s->decay;
-
-    s->pos += 2 * M_PI * s->freq / data->rate;
-  }
-
-   MP_VERBOSE(af, "f:%8.2f: amp:%8.2f\n", s->freq, sqrt(s->real*s->real + s->imag*s->imag) / s->ref);
-
-  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 = play_s16;
-  return AF_OK;
-}
-
-#define OPT_BASE_STRUCT af_sinesuppress_t
-const struct af_info af_info_sinesuppress = {
-    .info = "Sine Suppress",
-    .name = "sinesuppress",
-    .open = af_open,
-    .priv_size = sizeof(af_sinesuppress_t),
-    .options = (const struct m_option[]) {
-        OPT_DOUBLE("freq", freq, 0, OPTDEF_DOUBLE(50.0)),
-        OPT_DOUBLE("decay", decay, 0, OPTDEF_DOUBLE(0.0001)),
-        {0}
-    },
-};