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avfilter: add anoisesrc 

Signed-off-by: Kyle Swanson <k@ylo.ph>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
tags/n3.0
Kyle Swanson Paul B Mahol 9 years ago
parent
955cdc43a3
commit
6a11c7f160
6 changed files with 252 additions and 2 deletions
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  1. +1
    -0
      Changelog
  2. +40
    -0
      doc/filters.texi
  3. +1
    -0
      libavfilter/Makefile
  4. +1
    -0
      libavfilter/allfilters.c
  5. +207
    -0
      libavfilter/asrc_anoisesrc.c
  6. +2
    -2
      libavfilter/version.h

+ 1
- 0
Changelog View File

@@ -32,6 +32,7 @@ version <next>:
- Interplay ACM demuxer and audio decoder
- XMA1 & XMA2 decoder
- realtime filter
- anoisesrc audio filter source


version 2.8:


+ 40
- 0
doc/filters.texi View File

@@ -3157,6 +3157,46 @@ ffplay -f lavfi flite=text='No more be grieved for which that thou hast done.'
For more information about libflite, check:
@url{http://www.speech.cs.cmu.edu/flite/}

@section anoisesrc

Generate a noise audio signal.

The filter accepts the following options:

@table @option
@item sample_rate, r
Specify the sample rate. Default value is 48000 Hz.

@item amplitude, a
Specify the amplitude (0.0 - 1.0) of the generated audio stream. Default value
is 1.0.

@item duration, d
Specify the duration of the generated audio stream. Not specifying this option
results in noise with an infinite length.

@item color, colour, c
Specify the color of noise. Available noise colors are white, pink, and brown.
Default color is white.

@item seed, s
Specify a value used to seed the PRNG.

@item nb_samples, n
Set the number of samples per each output frame, default is 1024.
@end table

@subsection Examples

@itemize

@item
Generate 60 seconds of pink noise, with a 44.1 kHz sampling rate and an amplitude of 0.5:
@example
anoisesrc=d=60:c=pink:r=44100:a=0.5
@end example
@end itemize

@section sine

Generate an audio signal made of a sine wave with amplitude 1/8.


+ 1
- 0
libavfilter/Makefile View File

@@ -91,6 +91,7 @@ OBJS-$(CONFIG_VOLUME_FILTER) += af_volume.o
OBJS-$(CONFIG_VOLUMEDETECT_FILTER) += af_volumedetect.o

OBJS-$(CONFIG_AEVALSRC_FILTER) += aeval.o
OBJS-$(CONFIG_ANOISESRC_FILTER) += asrc_anoisesrc.o
OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
OBJS-$(CONFIG_FLITE_FILTER) += asrc_flite.o
OBJS-$(CONFIG_SINE_FILTER) += asrc_sine.o


+ 1
- 0
libavfilter/allfilters.c View File

@@ -113,6 +113,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(VOLUMEDETECT, volumedetect, af);

REGISTER_FILTER(AEVALSRC, aevalsrc, asrc);
REGISTER_FILTER(ANOISESRC, anoisesrc, asrc);
REGISTER_FILTER(ANULLSRC, anullsrc, asrc);
REGISTER_FILTER(FLITE, flite, asrc);
REGISTER_FILTER(SINE, sine, asrc);


+ 207
- 0
libavfilter/asrc_anoisesrc.c View File

@@ -0,0 +1,207 @@
/*
* 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/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"
#include "libavutil/lfg.h"
#include "libavutil/random_seed.h"

typedef struct {
const AVClass *class;
int sample_rate;
double amplitude;
int64_t duration;
int64_t color;
int64_t seed;
int nb_samples;

int64_t pts;
int infinite;
double (*filter)(double white, double *buf);
double buf[7];
AVLFG c;
} ANoiseSrcContext;

#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 = 1}, 0, 2, FLAGS, "color" },
{ "colour", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 2, FLAGS, "color" },
{ "c", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 2, FLAGS, "color" },
{ "white", 0, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, FLAGS, "color" },
{ "pink", 0, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, FLAGS, "color" },
{ "brown", 0, 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, FLAGS, "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 },
{NULL}
};

AVFILTER_DEFINE_CLASS(anoisesrc);

static av_cold int query_formats(AVFilterContext *ctx)
{
ANoiseSrcContext *s = ctx->priv;
static const int64_t chlayouts[] = { AV_CH_LAYOUT_MONO, -1 };
int sample_rates[] = { s->sample_rate, -1 };
static const enum AVSampleFormat sample_fmts[] = {
AV_SAMPLE_FMT_DBL,
AV_SAMPLE_FMT_NONE
};

AVFilterFormats *formats;
AVFilterChannelLayouts *layouts;
int 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;

layouts = avfilter_make_format64_list(chlayouts);
if (!layouts)
return AVERROR(ENOMEM);
ret = ff_set_common_channel_layouts(ctx, layouts);
if (ret < 0)
return ret;

formats = ff_make_format_list(sample_rates);
if (!formats)
return AVERROR(ENOMEM);
return ff_set_common_samplerates(ctx, formats);
}

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 brown_filter(double white, double *buf)
{
double brown;

brown = ((0.02 * white) + buf[0]) / 1.02;
buf[0] = brown;
return brown * 3.5;
}

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 0: s->filter = white_filter; break;
case 1: s->filter = pink_filter; break;
case 2: s->filter = brown_filter; break;
}

return 0;
}

static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ANoiseSrcContext *s = ctx->priv;
AVFrame *frame;
int nb_samples, i;
double *dst;

if (!s->infinite && s->duration <= 0) {
return AVERROR_EOF;
} 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,
.request_frame = request_frame,
.config_props = config_props,
},
{ NULL }
};

AVFilter ff_asrc_anoisesrc = {
.name = "anoisesrc",
.description = NULL_IF_CONFIG_SMALL("Generate a noise audio signal."),
.query_formats = query_formats,
.priv_size = sizeof(ANoiseSrcContext),
.inputs = NULL,
.outputs = anoisesrc_outputs,
.priv_class = &anoisesrc_class,
};

+ 2
- 2
libavfilter/version.h View File

@@ -30,8 +30,8 @@
#include "libavutil/version.h"

#define LIBAVFILTER_VERSION_MAJOR 6
#define LIBAVFILTER_VERSION_MINOR 14
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_MINOR 15
#define LIBAVFILTER_VERSION_MICRO 100

#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \


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