mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
1e7d2007c3
Makes it robust against adding fields before it, which will be useful in following commits. Majority of the patch generated by the following Coccinelle script: @@ typedef AVOption; identifier arr_name; initializer list il; initializer list[8] il1; expression tail; @@ AVOption arr_name[] = { il, { il1, - tail + .unit = tail }, ... }; with some manual changes, as the script: * has trouble with options defined inside macros * sometimes does not handle options under an #else branch * sometimes swallows whitespace
251 lines
9.1 KiB
C
251 lines
9.1 KiB
C
/*
|
|
* Copyright (c) 2015 Kyle Swanson <k@ylo.ph>.
|
|
*
|
|
* 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/channel_layout.h"
|
|
#include "libavutil/opt.h"
|
|
#include "audio.h"
|
|
#include "avfilter.h"
|
|
#include "filters.h"
|
|
#include "formats.h"
|
|
#include "internal.h"
|
|
#include "libavutil/lfg.h"
|
|
#include "libavutil/random_seed.h"
|
|
|
|
typedef struct ANoiseSrcContext {
|
|
const AVClass *class;
|
|
int sample_rate;
|
|
double amplitude;
|
|
double density;
|
|
int64_t duration;
|
|
int color;
|
|
int64_t seed;
|
|
int nb_samples;
|
|
|
|
int64_t pts;
|
|
int infinite;
|
|
double (*filter)(double white, double *buf);
|
|
double buf[7];
|
|
AVLFG c;
|
|
} ANoiseSrcContext;
|
|
|
|
enum NoiseMode {
|
|
NM_WHITE,
|
|
NM_PINK,
|
|
NM_BROWN,
|
|
NM_BLUE,
|
|
NM_VIOLET,
|
|
NM_VELVET,
|
|
NM_NB
|
|
};
|
|
|
|
#define OFFSET(x) offsetof(ANoiseSrcContext, x)
|
|
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
|
|
|
static const AVOption anoisesrc_options[] = {
|
|
{ "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS },
|
|
{ "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS },
|
|
{ "amplitude", "set amplitude", OFFSET(amplitude), AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS },
|
|
{ "a", "set amplitude", OFFSET(amplitude), AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS },
|
|
{ "duration", "set duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
|
|
{ "d", "set duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
|
|
{ "color", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NM_NB - 1, FLAGS, .unit = "color" },
|
|
{ "colour", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NM_NB - 1, FLAGS, .unit = "color" },
|
|
{ "c", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NM_NB - 1, FLAGS, .unit = "color" },
|
|
{ "white", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_WHITE}, 0, 0, FLAGS, .unit = "color" },
|
|
{ "pink", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_PINK}, 0, 0, FLAGS, .unit = "color" },
|
|
{ "brown", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_BROWN}, 0, 0, FLAGS, .unit = "color" },
|
|
{ "blue", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_BLUE}, 0, 0, FLAGS, .unit = "color" },
|
|
{ "violet", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_VIOLET}, 0, 0, FLAGS, .unit = "color" },
|
|
{ "velvet", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NM_VELVET}, 0, 0, FLAGS, .unit = "color" },
|
|
{ "seed", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS },
|
|
{ "s", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS },
|
|
{ "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
|
|
{ "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
|
|
{ "density", "set density", OFFSET(density), AV_OPT_TYPE_DOUBLE, {.dbl = 0.05}, 0., 1., FLAGS },
|
|
{NULL}
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(anoisesrc);
|
|
|
|
static av_cold int query_formats(AVFilterContext *ctx)
|
|
{
|
|
ANoiseSrcContext *s = ctx->priv;
|
|
static const AVChannelLayout chlayouts[] = { AV_CHANNEL_LAYOUT_MONO, { 0 } };
|
|
int sample_rates[] = { s->sample_rate, -1 };
|
|
static const enum AVSampleFormat sample_fmts[] = {
|
|
AV_SAMPLE_FMT_DBL,
|
|
AV_SAMPLE_FMT_NONE
|
|
};
|
|
int ret = ff_set_common_formats_from_list(ctx, sample_fmts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = ff_set_common_channel_layouts_from_list(ctx, chlayouts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return ff_set_common_samplerates_from_list(ctx, sample_rates);
|
|
}
|
|
|
|
static double white_filter(double white, double *buf)
|
|
{
|
|
return white;
|
|
}
|
|
|
|
static double pink_filter(double white, double *buf)
|
|
{
|
|
double pink;
|
|
|
|
/* http://www.musicdsp.org/files/pink.txt */
|
|
buf[0] = 0.99886 * buf[0] + white * 0.0555179;
|
|
buf[1] = 0.99332 * buf[1] + white * 0.0750759;
|
|
buf[2] = 0.96900 * buf[2] + white * 0.1538520;
|
|
buf[3] = 0.86650 * buf[3] + white * 0.3104856;
|
|
buf[4] = 0.55000 * buf[4] + white * 0.5329522;
|
|
buf[5] = -0.7616 * buf[5] - white * 0.0168980;
|
|
pink = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
|
|
buf[6] = white * 0.115926;
|
|
return pink * 0.11;
|
|
}
|
|
|
|
static double blue_filter(double white, double *buf)
|
|
{
|
|
double blue;
|
|
|
|
/* Same as pink_filter but subtract the offsets rather than add */
|
|
buf[0] = 0.0555179 * white - 0.99886 * buf[0];
|
|
buf[1] = 0.0750759 * white - 0.99332 * buf[1];
|
|
buf[2] = 0.1538520 * white - 0.96900 * buf[2];
|
|
buf[3] = 0.3104856 * white - 0.86650 * buf[3];
|
|
buf[4] = 0.5329522 * white - 0.55000 * buf[4];
|
|
buf[5] = -0.016898 * white + 0.76160 * buf[5];
|
|
blue = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362;
|
|
buf[6] = white * 0.115926;
|
|
return blue * 0.11;
|
|
}
|
|
|
|
static double brown_filter(double white, double *buf)
|
|
{
|
|
double brown;
|
|
|
|
brown = ((0.02 * white) + buf[0]) / 1.02;
|
|
buf[0] = brown;
|
|
return brown * 3.5;
|
|
}
|
|
|
|
static double violet_filter(double white, double *buf)
|
|
{
|
|
double violet;
|
|
|
|
violet = ((0.02 * white) - buf[0]) / 1.02;
|
|
buf[0] = violet;
|
|
return violet * 3.5;
|
|
}
|
|
|
|
static double velvet_filter(double white, double *buf)
|
|
{
|
|
double awhite = fabs(white);
|
|
return FFDIFFSIGN(white, 0.0) * buf[1] * (awhite < buf[0]);
|
|
}
|
|
|
|
static av_cold int config_props(AVFilterLink *outlink)
|
|
{
|
|
AVFilterContext *ctx = outlink->src;
|
|
ANoiseSrcContext *s = ctx->priv;
|
|
|
|
if (s->seed == -1)
|
|
s->seed = av_get_random_seed();
|
|
av_lfg_init(&s->c, s->seed);
|
|
|
|
if (s->duration == 0)
|
|
s->infinite = 1;
|
|
s->duration = av_rescale(s->duration, s->sample_rate, AV_TIME_BASE);
|
|
|
|
switch (s->color) {
|
|
case NM_WHITE: s->filter = white_filter; break;
|
|
case NM_PINK: s->filter = pink_filter; break;
|
|
case NM_BROWN: s->filter = brown_filter; break;
|
|
case NM_BLUE: s->filter = blue_filter; break;
|
|
case NM_VIOLET: s->filter = violet_filter; break;
|
|
case NM_VELVET: s->buf[0] = s->amplitude * s->density;
|
|
s->buf[1] = s->amplitude;
|
|
s->filter = velvet_filter; break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int activate(AVFilterContext *ctx)
|
|
{
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
ANoiseSrcContext *s = ctx->priv;
|
|
AVFrame *frame;
|
|
int nb_samples, i;
|
|
double *dst;
|
|
|
|
if (!ff_outlink_frame_wanted(outlink))
|
|
return FFERROR_NOT_READY;
|
|
|
|
if (!s->infinite && s->duration <= 0) {
|
|
ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
|
|
return 0;
|
|
} else if (!s->infinite && s->duration < s->nb_samples) {
|
|
nb_samples = s->duration;
|
|
} else {
|
|
nb_samples = s->nb_samples;
|
|
}
|
|
|
|
if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
|
|
return AVERROR(ENOMEM);
|
|
|
|
dst = (double *)frame->data[0];
|
|
for (i = 0; i < nb_samples; i++) {
|
|
double white;
|
|
white = s->amplitude * ((2 * ((double) av_lfg_get(&s->c) / 0xffffffff)) - 1);
|
|
dst[i] = s->filter(white, s->buf);
|
|
}
|
|
|
|
if (!s->infinite)
|
|
s->duration -= nb_samples;
|
|
|
|
frame->pts = s->pts;
|
|
s->pts += nb_samples;
|
|
return ff_filter_frame(outlink, frame);
|
|
}
|
|
|
|
static const AVFilterPad anoisesrc_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = config_props,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_asrc_anoisesrc = {
|
|
.name = "anoisesrc",
|
|
.description = NULL_IF_CONFIG_SMALL("Generate a noise audio signal."),
|
|
.priv_size = sizeof(ANoiseSrcContext),
|
|
.inputs = NULL,
|
|
.activate = activate,
|
|
FILTER_OUTPUTS(anoisesrc_outputs),
|
|
FILTER_QUERY_FUNC(query_formats),
|
|
.priv_class = &anoisesrc_class,
|
|
};
|