[FFmpeg-devel] [PATCH] avfilter: add anoisesrc
Kyle Swanson
k at ylo.ph
Wed Nov 4 19:19:57 CET 2015
Signed-off-by: Kyle Swanson <k at ylo.ph>
---
Changelog | 1 +
doc/filters.texi | 36 +++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/asrc_anoisesrc.c | 222 +++++++++++++++++++++++++++++++++++++++++++
libavfilter/version.h | 4 +-
6 files changed, 263 insertions(+), 2 deletions(-)
create mode 100644 libavfilter/asrc_anoisesrc.c
diff --git a/Changelog b/Changelog
index 91955da..ca477de 100644
--- a/Changelog
+++ b/Changelog
@@ -30,6 +30,7 @@ version <next>:
- innoHeim/Rsupport Screen Capture Codec decoder
- ADPCM AICA decoder
- Interplay ACM demuxer and audio decoder
+- anoisesrc audio source
version 2.8:
diff --git a/doc/filters.texi b/doc/filters.texi
index 15ea77a..620d787 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3193,6 +3193,42 @@ 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/}
+ at section anoisesrc
+
+Generate a noise audio signal.
+
+The filter accepts the following options:
+
+ at table @option
+
+ at item color, colour, c
+Specify the color of noise. Available noise colors are white, pink, and brown. Default color is white.
+
+ at item sample_rate, r
+Specify the sample rate. Default value is 48000 Hz.
+
+ at item duration, d
+Specify the duration of the generated audio stream. Not specifying this option results in noise with an infinite length.
+
+ at item amplitude, a
+Specify the amplitude (0.0 - 1.0) of the generated audio stream. Default value is 1.0.
+
+ at item seed, s
+Specify a value used to seed the PRNG. Default value is 0.
+
+ at end table
+
+ at subsection Examples
+
+ at itemize
+
+ at item
+Generate 60 seconds of pink noise, with a 44.1 kHz sampling rate and an amplitude of 0.5:
+ at example
+anoisesrc=d=60:c=pink:r=44100:a=0.5
+ at end example
+ at end itemize
+
@section sine
Generate an audio signal made of a sine wave with amplitude 1/8.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 1b23085..5f60e15 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -93,6 +93,7 @@ OBJS-$(CONFIG_VOLUMEDETECT_FILTER) += af_volumedetect.o
OBJS-$(CONFIG_AEVALSRC_FILTER) += aeval.o
OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
OBJS-$(CONFIG_FLITE_FILTER) += asrc_flite.o
+OBJS-$(CONFIG_ANOISESRC_FILTER) += asrc_anoisesrc.o
OBJS-$(CONFIG_SINE_FILTER) += asrc_sine.o
OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index a538b81..e716174 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -115,6 +115,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(AEVALSRC, aevalsrc, asrc);
REGISTER_FILTER(ANULLSRC, anullsrc, asrc);
REGISTER_FILTER(FLITE, flite, asrc);
+ REGISTER_FILTER(ANOISESRC, anoisesrc, asrc);
REGISTER_FILTER(SINE, sine, asrc);
REGISTER_FILTER(ANULLSINK, anullsink, asink);
diff --git a/libavfilter/asrc_anoisesrc.c b/libavfilter/asrc_anoisesrc.c
new file mode 100644
index 0000000..d008d67
--- /dev/null
+++ b/libavfilter/asrc_anoisesrc.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (c) 2015 Kyle Swanson <k at 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 <float.h>
+
+#include "libavutil/opt.h"
+#include "audio.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "libavutil/lfg.h"
+
+typedef struct {
+ const AVClass *class;
+ int sample_rate;
+ double amplitude;
+ int64_t dur;
+ char *color;
+ int seed;
+
+ int infinite;
+ double (*filter)(double white, double *buf);
+ double* buf;
+ int buf_size;
+ 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(dur), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
+ { "d", "set duration", OFFSET(dur), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
+ { "color", "set noise color", OFFSET(color), AV_OPT_TYPE_STRING, {.str = "white"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "colour", "set noise color", OFFSET(color), AV_OPT_TYPE_STRING, {.str = "white"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "c", "set noise color", OFFSET(color), AV_OPT_TYPE_STRING, {.str = "white"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "seed", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, FLAGS },
+ { "s", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_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->dur == 0) {
+ s->infinite = 1;
+ } else {
+ s->dur = av_rescale(s->dur, s->sample_rate, AV_TIME_BASE);
+ }
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx) {
+ ANoiseSrcContext *s = ctx->priv;
+
+ av_lfg_init(&s->c, s->seed);
+
+ if (!strcmp(s->color, "pink")) {
+ s->filter = pink_filter;
+ s->buf_size = 7;
+ } else if(!strcmp(s->color, "brown")) {
+ s->filter = brown_filter;
+ s->buf_size = 1;
+ } else if(!strcmp(s->color, "white")) {
+ s->filter = white_filter;
+ s->buf_size = 0;
+ } else {
+ av_log(ctx, AV_LOG_ERROR, "Invalid noise color: %s\n", s->color);
+ return AVERROR_OPTION_NOT_FOUND;
+ }
+
+ if (s->buf_size > 0) {
+ s->buf = av_malloc_array(s->buf_size, sizeof(double));
+ if (!s->buf)
+ return AVERROR(ENOMEM);
+ for (int i = 0; i < s->buf_size; i++)
+ s->buf[i] = 0;
+ }
+
+ 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->dur <= 0) {
+ return AVERROR_EOF;
+ } else if (!s->infinite && s->dur < 1024) {
+ nb_samples = s->dur;
+ } else {
+ nb_samples = 1024;
+ }
+
+ 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);
+ }
+
+ s->dur -= nb_samples;
+ return ff_filter_frame(outlink, frame);
+}
+
+static av_cold void uninit(AVFilterContext *ctx) {
+ ANoiseSrcContext *s = ctx->priv;
+ if (s->buf_size > 0)
+ av_freep(&s->buf);
+}
+
+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."),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .priv_size = sizeof(ANoiseSrcContext),
+ .inputs = NULL,
+ .outputs = anoisesrc_outputs,
+ .priv_class = &anoisesrc_class,
+};
diff --git a/libavfilter/version.h b/libavfilter/version.h
index c3ecf91..ed3b642 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -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, \
--
2.6.2
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