mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
494b792441
Fixes playback of some files with ffplay. Signed-off-by: Paul B Mahol <onemda@gmail.com>
168 lines
5.0 KiB
C
168 lines
5.0 KiB
C
/*
|
|
* Copyright (c) 2000 Chris Ausbrooks <weed@bucket.pp.ualr.edu>
|
|
* Copyright (c) 2000 Fabien COELHO <fabien@coelho.net>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/opt.h"
|
|
#include "libavutil/samplefmt.h"
|
|
#include "avfilter.h"
|
|
#include "audio.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct DCShiftContext {
|
|
const AVClass *class;
|
|
double dcshift;
|
|
double limiterthreshhold;
|
|
double limitergain;
|
|
} DCShiftContext;
|
|
|
|
#define OFFSET(x) offsetof(DCShiftContext, x)
|
|
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
|
|
|
static const AVOption dcshift_options[] = {
|
|
{ "shift", "set DC shift", OFFSET(dcshift), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
|
|
{ "limitergain", "set limiter gain", OFFSET(limitergain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, A },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(dcshift);
|
|
|
|
static av_cold int init(AVFilterContext *ctx)
|
|
{
|
|
DCShiftContext *s = ctx->priv;
|
|
|
|
s->limiterthreshhold = INT32_MAX * (1.0 - (fabs(s->dcshift) - s->limitergain));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
AVFilterChannelLayouts *layouts;
|
|
AVFilterFormats *formats;
|
|
static const enum AVSampleFormat sample_fmts[] = {
|
|
AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_NONE
|
|
};
|
|
int ret;
|
|
|
|
layouts = ff_all_channel_counts();
|
|
if (!layouts)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_set_common_channel_layouts(ctx, layouts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
formats = ff_make_format_list(sample_fmts);
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_set_common_formats(ctx, formats);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
formats = ff_all_samplerates();
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
return ff_set_common_samplerates(ctx, formats);
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AVFrame *out = ff_get_audio_buffer(inlink, in->nb_samples);
|
|
DCShiftContext *s = ctx->priv;
|
|
int i, j;
|
|
double dcshift = s->dcshift;
|
|
|
|
if (!out) {
|
|
av_frame_free(&in);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
av_frame_copy_props(out, in);
|
|
|
|
if (s->limitergain > 0) {
|
|
for (i = 0; i < inlink->channels; i++) {
|
|
const int32_t *src = (int32_t *)in->extended_data[i];
|
|
int32_t *dst = (int32_t *)out->extended_data[i];
|
|
|
|
for (j = 0; j < in->nb_samples; j++) {
|
|
double d;
|
|
|
|
d = src[j];
|
|
|
|
if (d > s->limiterthreshhold && dcshift > 0) {
|
|
d = (d - s->limiterthreshhold) * s->limitergain /
|
|
(INT32_MAX - s->limiterthreshhold) +
|
|
s->limiterthreshhold + dcshift;
|
|
} else if (d < -s->limiterthreshhold && dcshift < 0) {
|
|
d = (d + s->limiterthreshhold) * s->limitergain /
|
|
(INT32_MAX - s->limiterthreshhold) -
|
|
s->limiterthreshhold + dcshift;
|
|
} else {
|
|
d = dcshift * INT32_MAX + d;
|
|
}
|
|
|
|
dst[j] = av_clipl_int32(d);
|
|
}
|
|
}
|
|
} else {
|
|
for (i = 0; i < inlink->channels; i++) {
|
|
const int32_t *src = (int32_t *)in->extended_data[i];
|
|
int32_t *dst = (int32_t *)out->extended_data[i];
|
|
|
|
for (j = 0; j < in->nb_samples; j++) {
|
|
double d = dcshift * (INT32_MAX + 1.) + src[j];
|
|
|
|
dst[j] = av_clipl_int32(d);
|
|
}
|
|
}
|
|
}
|
|
|
|
av_frame_free(&in);
|
|
return ff_filter_frame(outlink, out);
|
|
}
|
|
static const AVFilterPad dcshift_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad dcshift_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_dcshift = {
|
|
.name = "dcshift",
|
|
.description = NULL_IF_CONFIG_SMALL("Apply a DC shift to the audio."),
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(DCShiftContext),
|
|
.priv_class = &dcshift_class,
|
|
.init = init,
|
|
.inputs = dcshift_inputs,
|
|
.outputs = dcshift_outputs,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
|
|
};
|