[FFmpeg-devel] [PATCH][GSoC]audio filter-use cellular automata to generate tones
Ashutosh Pradhan
ashutoshp012345 at gmail.com
Wed Mar 18 15:42:27 EET 2020
Use cellular automata to generate tones
diff --git a/Changelog b/Changelog
index d1572553a5..5ddd2484b0 100644
--- a/Changelog
+++ b/Changelog
@@ -48,6 +48,7 @@ version <next>:
- AMQP 0-9-1 protocol (RabbitMQ)
- Vulkan support
- avgblur_vulkan, overlay_vulkan, scale_vulkan and chromaber_vulkan filters
+- atone filter
version 4.2:
diff --git a/configure b/configure
index 6ceb0c7af4..2ec7e377f3 100755
--- a/configure
+++ b/configure
@@ -233,6 +233,7 @@ External library support:
and libraw1394 [no]
--enable-libfdk-aac enable AAC de/encoding via libfdk-aac [no]
--enable-libflite enable flite (voice synthesis) support via libflite [no]
+ --enable-libfluidsynth enable libfluidsynth support for fluidsynth [no]
--enable-libfontconfig enable libfontconfig, useful for drawtext filter [no]
--enable-libfreetype enable libfreetype, needed for drawtext filter [no]
--enable-libfribidi enable libfribidi, improves drawtext filter [no]
@@ -1770,6 +1771,7 @@ EXTERNAL_LIBRARY_LIST="
libdc1394
libdrm
libflite
+ libfluidsynth
libfontconfig
libfreetype
libfribidi
@@ -3465,6 +3467,7 @@ asr_filter_deps="pocketsphinx"
ass_filter_deps="libass"
atempo_filter_deps="avcodec"
atempo_filter_select="rdft"
+atone_filter_deps="libfluidsynth"
avgblur_opencl_filter_deps="opencl"
avgblur_vulkan_filter_deps="vulkan libglslang"
azmq_filter_deps="libzmq"
@@ -6270,6 +6273,7 @@ enabled libfdk_aac && { check_pkg_config libfdk_aac fdk-aac "fdk-aac/aace
warn "using libfdk without pkg-config"; } }
flite_extralibs="-lflite_cmu_time_awb -lflite_cmu_us_awb -lflite_cmu_us_kal -lflite_cmu_us_kal16 -lflite_cmu_us_rms -lflite_cmu_us_slt -lflite_usenglish -lflite_cmulex -lflite"
enabled libflite && require libflite "flite/flite.h" flite_init $flite_extralibs
+enabled libfluidsynth && require_pkg_config libfluidsynth fluidsynth "fluidsynth.h" fluid_log
enabled fontconfig && enable libfontconfig
enabled libfontconfig && require_pkg_config libfontconfig fontconfig "fontconfig/fontconfig.h" FcInit
enabled libfreetype && require_pkg_config libfreetype freetype2 "ft2build.h FT_FREETYPE_H" FT_Init_FreeType
diff --git a/doc/filters.texi b/doc/filters.texi
index 328e984e92..0eda8a4c6e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6050,6 +6050,57 @@ anoisesrc=d=60:c=pink:r=44100:a=0.5
@end example
@end itemize
+ at section atone
+
+Generate legato tones using cellular automata.
+To compile filter configure ffmpeg with @code{--enable-libfluidsynth}
+
+The filter accepts the following options:
+
+ at table @option
+ at item sample_rate, r
+Specify the sample rate. Default value is 44100 Hz.
+
+ at item sfont
+Specify the location of soundfont file. Default value is
+"/usr/share/sounds/sf2/FluidR3_GM.sf2"(for linux).
+
+ at item duration, d
+Specify the duration of the generated audio stream. Not specifying this option
+results in playing tones for infinite length.
+
+ at item velocity, v
+Specify the velocity of key press. Default value is 80.
+
+ at item MIDI_channel
+Specify the MIDI channel number between(0 to 16) to play tones. Default is 0.
+
+ at item tone_change_interval, t
+Specify the time interval between successive tones in seconds. Default is 0.2s.
+
+ at item rule
+Specify the rule between 0 to 255 to get the rule set. Default is 30.
+
+ at item width
+Specify the width of the cells array. Default is 64.
+
+ at item samples_per_frame
+Set the number of samples per each output frame. Default is 1024.
+ at end table
+
+ at subsection Examples
+
+ at itemize
+
+ at item
+Generate 10 seconds of random tones, with a key velocity of 100, midi channel 1
+and an tone change interval of 0.1s:
+ at example
+atone=d=10:MIDI_channel=1:v=100:t=0.1:sfont="example.sf2":rule=193
+atone=duration=10:MIDI_channel=1:velocity=100:tone_change_interval=0.1:sfont="example.sf2":rule=193
+ at end example
+ at end itemize
+
@section hilbert
Generate odd-tap Hilbert transform FIR coefficients.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 750412da6b..b1f0c4be35 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -151,6 +151,7 @@ OBJS-$(CONFIG_FLITE_FILTER) += asrc_flite.o
OBJS-$(CONFIG_HILBERT_FILTER) += asrc_hilbert.o
OBJS-$(CONFIG_SINC_FILTER) += asrc_sinc.o
OBJS-$(CONFIG_SINE_FILTER) += asrc_sine.o
+OBJS-$(CONFIG_ATONE_FILTER) += asrc_atone.o
OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 501e5d041b..4d3efc7e15 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -145,6 +145,7 @@ extern AVFilter ff_asrc_flite;
extern AVFilter ff_asrc_hilbert;
extern AVFilter ff_asrc_sinc;
extern AVFilter ff_asrc_sine;
+extern AVFilter ff_asrc_atone;
extern AVFilter ff_asink_anullsink;
diff --git a/libavfilter/asrc_atone.c b/libavfilter/asrc_atone.c
new file mode 100644
index 0000000000..04465ec4e0
--- /dev/null
+++ b/libavfilter/asrc_atone.c
@@ -0,0 +1,275 @@
+/*
+ * 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 <stdio.h>
+#include <string.h>
+#include <fluidsynth.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "libavutil/avassert.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/eval.h"
+#include "libavutil/opt.h"
+#include "libavutil/lfg.h"
+#include "libavutil/random_seed.h"
+#include "audio.h"
+#include "avfilter.h"
+#include "internal.h"
+
+typedef struct AtoneContext
+{
+ const AVClass* class;
+ int64_t duration;
+ int nb_samples;
+ int sample_rate;
+ int64_t pts;
+ int infinite;
+
+ fluid_settings_t* settings;
+ fluid_synth_t* synth;
+ char* sfont; ///< soundfont file
+ int sfont_id;
+ int midi_chan; ///< midi channel number
+ int velocity; ///< velocity of key
+ double changerate; ///< get the time interval of changing tones
+ int key[7]; ///< play tones within one octave
+ int *cells;
+ int *nextgen;
+ int rule; ///< Rule for changing value in cell(taking 3 cells at time hence 2^8 rules possible)
+ int width; ///< width of the cell array
+ int ruleset[8]; ///< taking 3 cells at a time
+}AtoneContext;
+
+#define CONTEXT AtoneContext
+#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+#define OPT_GENERIC(name, field, def, min, max, descr, type, deffield, ...) \
+ { name, descr, offsetof(CONTEXT, field), AV_OPT_TYPE_ ## type, \
+ { .deffield = def }, min, max, FLAGS, __VA_ARGS__ }
+
+#define OPT_INT(name, field, def, min, max, descr, ...) \
+ OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__)
+
+#define OPT_DBL(name, field, def, min, max, descr, ...) \
+ OPT_GENERIC(name, field, def, min, max, descr, DOUBLE, dbl, __VA_ARGS__)
+
+#define OPT_DUR(name, field, def, min, max, descr, ...) \
+ OPT_GENERIC(name, field, def, min, max, descr, DURATION, str, __VA_ARGS__)
+
+#define OPT_STR(name, field, def, min, max, descr, ...) \
+ OPT_GENERIC(name, field, def, min, max, descr, STRING, str, __VA_ARGS__)
+
+static const AVOption atone_options[] = {
+ OPT_INT("velocity", velocity, 80, 0, INT_MAX, "set the velocity of key press",),
+ OPT_INT("v", velocity, 80, 0, INT_MAX, "set the velocity of key press",),
+ OPT_INT("sample_rate", sample_rate, 44100, 1, INT_MAX, "set the sample rate",),
+ OPT_INT("r", sample_rate, 44100, 1, INT_MAX, "set the sample rate",),
+ OPT_DUR("duration", duration, 0, 0, INT64_MAX, "set the audio duration",),
+ OPT_DUR("d", duration, 0, 0, INT64_MAX, "set the audio duration",),
+ OPT_STR("sfont", sfont, "/usr/share/sounds/sf2/FluidR3_GM.sf2", 0, 0, "set the soundfont file",),
+ OPT_INT("samples_per_frame", nb_samples, 1024, 0, INT_MAX, "set the number of samples per frame",),
+ OPT_INT("MIDI_channel", midi_chan, 0, 0, 16, "set the MIDI Channel",),
+ OPT_DBL("tone_change_interval",changerate, 0.2, 0, DBL_MAX, "set the random tone change time in seconds",),
+ OPT_DBL("t", changerate, 0.2, 0, DBL_MAX, "set the random tone change time in seconds",),
+ OPT_INT("rule", rule, 30, 0, 256, "set the rule for changing value in cell",),
+ OPT_INT("width", width, 64, 0, INT_MAX, "set the width of the cell array",),
+ {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(atone);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ AtoneContext *s = ctx->priv;
+ int val;
+ /*Initialise the fluidsynth settings object followed by synthesizer*/
+ s->settings = new_fluid_settings();
+ if (s->settings== NULL){
+ av_log(s, AV_LOG_ERROR, "Failed to create the fluidsynth settings");
+ return AVERROR_EXTERNAL;
+ }
+
+ s->synth = new_fluid_synth(s->settings);
+ if (s->synth== NULL){
+ av_log(s, AV_LOG_ERROR, "Failed to create the fluidsynth synth");
+ return AVERROR_EXTERNAL;
+ }
+
+ s->sfont_id= fluid_synth_sfload(s->synth, s->sfont, 1);
+ if(s->sfont_id== FLUID_FAILED){
+ av_log(s, AV_LOG_ERROR, "Loading the Soundfont Failed");
+ return AVERROR_EXTERNAL;
+ }
+ if (!(s->cells = av_malloc(sizeof(int)*(s->width))))
+ return AVERROR(ENOMEM);
+
+ if (!(s->nextgen = av_malloc(sizeof(int)*(s->width))))
+ return AVERROR(ENOMEM);
+
+ for (int i=0; i<7; i++)
+ s->key[i]=0;
+
+ s->changerate= s->changerate*s->sample_rate/s->nb_samples;
+ if (s->changerate<1.0)
+ s->changerate= 1.0;
+
+ for (int i=0; i< s->width; i++)
+ s->cells[i]=0;
+ s->cells[s->width/2]=1;
+
+ val= s->rule;
+ for (int i=0; i<8; i++){
+ s->ruleset[i]= val%2;
+ val= val>>1;
+ }
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ AtoneContext *s = ctx->priv;
+
+ delete_fluid_synth(s->synth);
+ delete_fluid_settings(s->settings);
+ av_freep(&s->cells);
+ av_freep(&s->nextgen);
+}
+
+static av_cold int config_props(AVFilterLink *outlink)
+{
+ AtoneContext *s = outlink->src->priv;
+
+ if (s->duration==0)
+ s->infinite=1;
+ s->duration = av_rescale(s->duration, s->sample_rate, AV_TIME_BASE);
+ return 0;
+}
+/*
+Generate keys using cellular automata. Reference taken from http://tones.wolfram.com/about/how-it-works
+to generate the cells. Rule 30(default) gives random numbers. Here middle part(+-3) of the cell generation
+is taken to get the keys. All the keys generated in the octave are played at the same time.
+*/
+static void generate(AtoneContext* s){
+ for (int i=0; i< s->width; i++){
+ int c=0;
+ for (int j=0; j<3; j++){
+ c+= s->cells[(i+j-1)%s->width]<<(j);
+ }
+ s->nextgen[i]= s->ruleset[c];
+ }
+ memcpy(s->cells, s->nextgen, s->width*sizeof(int));
+ memcpy(s->key, &s->cells[s->width/2-3], 7*sizeof(int));
+}
+
+static void gen_random_tone_samples(AtoneContext* s, int buf_size, float* data){
+
+ for(int i=0; i<7; i++)
+ if (s->key[i]==1)
+ fluid_synth_noteon(s->synth, s->midi_chan, (64+i), s->velocity);//pp range octave
+
+ fluid_synth_write_float(s->synth, buf_size, data, 0, 2, data, 1, 2);
+ fluid_synth_all_notes_off(s->synth, s->midi_chan);
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AtoneContext *s = ctx->priv;
+ AVFrame *frame;
+ int nb_samples;
+ 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);
+
+ if (s->pts % ((int)(s->changerate)*nb_samples) == 0)
+ generate(s);
+
+ gen_random_tone_samples(s, nb_samples, (float*)frame->data[0]);
+
+ if (!s->infinite)
+ s->duration -= nb_samples;
+
+ frame->pts = s->pts;
+ s->pts += nb_samples;
+ return ff_filter_frame(outlink, frame);
+}
+
+static av_cold int query_formats(AVFilterContext *ctx)
+{
+ AtoneContext *s = ctx->priv;
+ static const int64_t chlayouts[] = { AV_CH_LAYOUT_STEREO, -1 };
+ int sample_rates[] = { s->sample_rate, -1 };
+ static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, 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 const AVFilterPad atone_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .request_frame = request_frame,
+ .config_props = config_props,
+ },
+ { NULL }
+};
+
+AVFilter ff_asrc_atone = {
+ .name = "atone",
+ .description = NULL_IF_CONFIG_SMALL("Generate tones using cellular automata."),
+ .query_formats = query_formats,
+ .init = init,
+ .uninit = uninit,
+ .priv_size = sizeof(AtoneContext),
+ .inputs = NULL,
+ .outputs = atone_outputs,
+ .priv_class = &atone_class,
+};
+
+
+
+
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 7b41018be7..4c4e8afe2d 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
-#define LIBAVFILTER_VERSION_MINOR 77
+#define LIBAVFILTER_VERSION_MINOR 78
#define LIBAVFILTER_VERSION_MICRO 100
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