diff --git a/Changelog b/Changelog
index a60e7d2eb8..ec12027740 100644
--- a/Changelog
+++ b/Changelog
@@ -80,7 +80,7 @@ version 4.3:
 - PFM decoder
 - dblur video filter
 - Real War KVAG muxer
-
+- atone filter
 
 version 4.2:
 - tpad filter
diff --git a/configure b/configure
index 7495f35faa..825e38a4b0 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]
@@ -1772,6 +1773,7 @@ EXTERNAL_LIBRARY_LIST="
     libdc1394
     libdrm
     libflite
+    libfluidsynth
     libfontconfig
     libfreetype
     libfribidi
@@ -3486,6 +3488,7 @@ 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"
@@ -6307,6 +6310,7 @@ 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 3c2dd2eb90..8733b52a2f 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6128,6 +6128,62 @@ anoisesrc=d=60:c=pink:r=44100:a=0.5
 @end example
 @end itemize
 
+@section atone
+
+Generate algorithmic riff music.
+To compile filter configure ffmpeg with @code{--enable-libfluidsynth} 
+
+The filter accepts the following options:
+
+@table @option
+@item sample_rate, r
+Specify the sample rate. Default value is 44100 Hz.
+
+@item sfont
+Specify the location of soundfont file. Default value is 
+"/usr/share/sounds/sf2/FluidR3_GM.sf2"(for linux).
+
+@item duration, d
+Specify the duration of the generated audio stream. Not specifying this option
+results in playing tones for infinite length.
+
+@item velocity, v
+Specify the velocity of key press. Default value is 80.
+
+@item percussion_velocity
+Specify the velocity of key press for percussion track. Default value is 127.
+
+@item bpm
+Specify the beats per minute. Default is 100.
+
+@item instrument
+Specify the instrument. Available instruments are Acoustic-Grand, 
+Bright-Acoustic, ... as defined in the General Midi specifications. Default is Trumpet.
+
+@item percussion
+Specify the percussion track for beats. Available options are Jazz1, 
+Jazz2, ..., Jazz6, Rock1...4, Shuffle, Metronome. Default is Metronome.
+
+@item numbars
+Set the number of bars in which riff energy will change between 0 to 8. Default is 2.
+
+@item samples_per_frame
+Set the number of samples per each output frame. Default is 1024.
+@end table
+
+@subsection Examples
+
+@itemize
+
+@item
+Generate 10 seconds of riff music, with a key velocity of 100, instrument as Electric Guitar(jazz) 
+and percussion track as Jazz3:
+@example
+atone=d=10:v=100:sfont="example.sf2":instrument=Electric-Guitar-Jazz:percussion=Jazz3
+atone=duration=10:velocity=100:sfont="example.sf2":instrument=Electric-Guitar-Jazz:percussion=Jazz3
+@end example
+@end itemize
+
 @section hilbert
 
 Generate odd-tap Hilbert transform FIR coefficients.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 5123540653..b0938830f2 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -152,6 +152,7 @@ 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 1183e40267..90f266a2d9 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -146,6 +146,7 @@ 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..f018732017
--- /dev/null
+++ b/libavfilter/asrc_atone.c
@@ -0,0 +1,474 @@
+/*
+ * 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"
+#include "notedef.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;
+    fluid_sequencer_t *sequencer;
+    short synth_destination, client_destination;
+    unsigned int beat_dur;
+    unsigned int beats_pm;
+    unsigned int time_marker;
+    char *sfont;                      ///< soundfont file
+    int velocity;                    ///< velocity of key
+    int percussion_velocity;         ///< velocity of key in percussion
+    double changerate;              
+   
+    int *riffs;
+    int numriffs;
+    int last_note;
+    int framecount;
+    char *instrument;
+    percussion track;
+    char *track_name;
+    int numbars;
+    int64_t seed;
+    AVLFG r;
+    int i;
+}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, 127,                 "set the velocity of key press",),
+    OPT_INT("v",                 velocity,                   80,                                         0, 127,                 "set the velocity of key press",),
+    OPT_INT("percussion_velocity",percussion_velocity,       127,                                        0, 127,                 "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("bpm",               beats_pm,                   100,                                        0, INT_MAX,             "set the beats per minute",),
+    OPT_STR("instrument",        instrument,                 "Trumpet",                                  0, 0,                   "set the instrument",),
+    OPT_STR("percussion",        track_name,                 "Metronome",                                0, 0,                   "set the percussion track",),
+    OPT_INT("numbars",           numbars,                    2,                                          0, 8,                   "set the riff bars",),
+    {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(atone);
+
+static void sequencer_callback(unsigned int time, fluid_event_t *event, fluid_sequencer_t *seq, void *data);
+static void instrument_select(int prog_no, unsigned int ticks, AtoneContext *s);
+static int find_instrument(const char *instrument);
+static int find_percussion_track(char *s);
+static av_cold int init(AVFilterContext *ctx)
+{
+    AtoneContext *s = ctx->priv;
+    int sfont_id;
+
+    /*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;
+    }
+    sfont_id = fluid_synth_sfload(s->synth, s->sfont, 1);
+    if (sfont_id == FLUID_FAILED) {
+        av_log(s, AV_LOG_ERROR, "Loading the Soundfont Failed");
+        return AVERROR_EXTERNAL;
+    }
+    if (!(s->riffs = av_malloc(sizeof(riff))))
+        return AVERROR(ENOMEM);
+
+    s->framecount=0;
+    s->sequencer = new_fluid_sequencer2(0);
+    /* register the synth with the sequencer */
+    s->synth_destination = fluid_sequencer_register_fluidsynth(s->sequencer, s->synth);
+    /* register the client name and callback */
+    s->client_destination = fluid_sequencer_register_client(s->sequencer, "atone", sequencer_callback, s);
+    s->time_marker = fluid_sequencer_get_tick(s->sequencer);
+    /*get the beat duration in TICKS     1 quarter note per beat*/
+    s->beat_dur = 60000/s->beats_pm;
+    /*get change interval in frames/sec*/
+    s->changerate = (4*s->beat_dur)*s->sample_rate/s->nb_samples;
+    if (s->changerate<1.0)
+        s->changerate = 1.0;
+
+    s->last_note = 0;
+    s->numriffs = sizeof(riff)/(NPR* sizeof(int));
+    s->seed = av_get_random_seed();
+    av_lfg_init(&s->r, s->seed);
+
+    for (int i = 0; i < s->numriffs*NPR ; i++)
+        s->riffs[i] = riff[i];
+    
+    s->i = find_percussion_track(s->track_name);
+    instrument_select(find_instrument(s->instrument), s->time_marker, s);
+
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    AtoneContext *s = ctx->priv;
+
+    delete_fluid_sequencer(s->sequencer);
+    delete_fluid_synth(s->synth);
+    delete_fluid_settings(s->settings);
+    av_freep(&s->riffs);
+}
+
+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);
+
+    if (s->framecount == INT_MAX)
+       s->framecount = 0;
+        
+    return 0;
+}
+
+static int find_instrument(const char *instrument)
+{
+    for (int i = 0; i < sizeof(GM_instrument_list)/sizeof(GM_instrument_list[0]); i++)
+        if (strcmp(GM_instrument_list[i], instrument) == 0)
+            return i;   
+    
+    return 0;
+}
+
+static void instrument_select(int prog_no, unsigned int ticks, AtoneContext *s)
+{
+    fluid_event_t *ev = new_fluid_event();
+    
+    fluid_event_set_source(ev, -1);
+    fluid_event_set_dest(ev,s->synth_destination);
+    fluid_event_program_change(ev, 0, prog_no);
+    fluid_sequencer_send_at(s->sequencer, ev, ticks, 1);
+    delete_fluid_event(ev);
+}
+
+/* schedule a note on message */
+static void schedule_noteon(int chan, short key, unsigned int ticks, int velocity, AtoneContext *s)
+{
+   fluid_event_t *ev = new_fluid_event();
+
+    fluid_event_set_source(ev, -1);
+    fluid_event_set_dest(ev,s->synth_destination);
+    fluid_event_noteon(ev, chan, key, velocity);
+    fluid_sequencer_send_at(s->sequencer, ev, ticks, 1);
+    delete_fluid_event(ev);
+}
+
+/* schedule a note off message */
+static void schedule_noteoff(int chan, short key, unsigned int ticks, AtoneContext *s)
+{
+    fluid_event_t *ev = new_fluid_event();
+
+    fluid_event_set_source(ev, -1);
+    fluid_event_set_dest(ev, s->synth_destination);
+    fluid_event_noteoff(ev, chan, key);
+    fluid_sequencer_send_at(s->sequencer, ev, ticks, 1);
+    delete_fluid_event(ev);
+}
+
+/* schedule a timer event to trigger the callback */
+static void schedule_timer_event(AtoneContext *s)
+{
+    fluid_event_t *ev = new_fluid_event();
+
+    fluid_event_set_source(ev, -1);
+    fluid_event_set_dest(ev, s->client_destination);
+    fluid_event_timer(ev, NULL);
+    fluid_sequencer_send_at(s->sequencer, ev, s->time_marker, 1);
+    delete_fluid_event(ev);
+}
+
+/*Determine the closest riff to the previous riff within three tries to make the transition between riffs smoother*/
+static int pick_riff(AtoneContext *s)
+{
+    int min, dn, riff, bestriff = 0;
+    unsigned rand = av_lfg_get(&s->r)/2;
+    
+    min = 999;
+    for (int i = 2; i >= 0; i--) {
+        riff = rand%s->numriffs;
+        if (s->last_note == 0)
+            return(riff);
+        dn = abs(s->last_note - s->riffs[riff*NPR]);
+        if (dn == 0)
+            dn = 6;
+        if (dn < min) {
+            bestriff = riff;
+            min = dn;
+        }
+    }
+
+    return bestriff;
+}
+
+/*Determine the energy of the player which will affect the number of rests and holding tones*/
+static int energy_calc(int i, int numbars)
+{
+    if (3*i < numbars)
+        return (100 - (90*i)/numbars);
+    else if (3*i > 2*numbars)
+        return (40 + (90*i)/numbars);
+    return 70;
+}
+
+static void play_riff(int riff, int energy, int note_duration, int note_time, AtoneContext *s)
+{
+    int pnd = 0, next; 
+    short pn = 0 ;
+    /*Beat importance values chosen such that off beat values are more likely to be skipped than on beat*/
+    int biv[] = {28, 0, 7, 0, 14, 0, 7, 4};
+    unsigned rand; 
+    for (int i = 0; i < NPR; i++)
+    {
+        rand = av_lfg_get(&s->r)/2;
+        next = s->riffs[riff*NPR + i];
+        if (next != H && next != R && ((energy + biv[i]) < rand%100))
+            next = (rand < RAND_MAX/2)? H : R;
+        if (next == H) {
+            pnd ++;
+            continue;
+        }
+        
+        if (pn != R) {
+            schedule_noteon(0, pn, note_time, s->velocity, s);
+            note_time += pnd*note_duration;
+            schedule_noteoff(0, pn, note_time, s);
+            s->last_note = pn;
+        }
+        pn = next;
+        pnd = 1;
+    }
+
+    if (pn != R && pn != H) {
+        schedule_noteon(0, pn, note_time, s->velocity, s);
+        note_time += pnd*note_duration;
+        schedule_noteoff(0, pn, note_time, s);
+        s->last_note = pn;
+    }
+           
+}
+
+static int find_percussion_track(char *s)
+{
+    int i;
+
+    for (i = 0 ; i < sizeof(percussion_tracks)/sizeof(percussion_tracks[0]) ; i++)
+        if (strcmp(percussion_tracks[i], s) == 0)
+            break;
+    
+   return i;   
+}
+static void play_percussion(AtoneContext *s)
+{
+    int note_time = s->time_marker;
+
+    switch (s->i) {
+    case 0: s->track = Track_1; break;
+    case 1: s->track = Track_2; break;
+    case 2: s->track = Track_3; break;
+    case 3: s->track = Track_4; break;
+    case 4: s->track = Track_5; break;
+    case 5: s->track = Track_6; break;
+    case 6: s->track = Track_7; break;
+    case 7: s->track = Track_8; break;
+    case 8: s->track = Track_9; break;
+    case 9: s->track = Track_10; break;
+    case 10: s->track = Track_11; break;
+    default: s->track = Track_12; break;
+    } 
+    
+    for (int i = 0; i < s->track.length; i++) {
+        /*percussion instruments in channel 10 */ 
+        schedule_noteon(9, s->track.note[i].instrument_1, note_time, s->percussion_velocity, s);
+        schedule_noteon(9, s->track.note[i].instrument_2, note_time, s->percussion_velocity,s);
+        schedule_noteon(9, s->track.note[i].instrument_3, note_time, s->percussion_velocity,s);
+        /*Multiply by 4 as quarter note takes 1 beat, Whole note takes 4 beats and so on*/
+        note_time += 4*s->beat_dur/s->track.note[i].beat;
+        schedule_noteoff(9, s->track.note[i].instrument_1, note_time, s);
+        schedule_noteoff(9, s->track.note[i].instrument_2, note_time, s);
+        schedule_noteoff(9, s->track.note[i].instrument_3, note_time, s);
+    }
+}
+
+/*Determine the pattern, tempo (to paly as 8th, 16th or 32nd notes) and add the riffs to sequencer
+Refernce: http://peterlangston.com/Papers/amc.pdf */
+static void schedule_riff_pattern(AtoneContext *s)
+{
+    int note_time, note_duration, tempo, rpb, energy, riff;
+    unsigned rand = av_lfg_get(&s->r)/2;
+    note_time = s->time_marker;
+    tempo = 1;
+    
+    if (tempo > rand%3)
+        tempo--;
+    else if (tempo < rand%3)
+        tempo++;
+    tempo = tempo%3;
+    rpb = 1<<tempo;
+    note_duration = 4*s->beat_dur/(NPR*rpb);
+    energy = energy_calc(rand%s->numbars, s->numbars);
+    for  (int r = 0; r < rpb; r++) {
+        riff = pick_riff(s);
+        play_riff(riff, energy, note_duration, note_time, s);
+        
+    }  
+    
+    play_percussion(s);
+    s->time_marker += 4*s->beat_dur;   
+}
+
+static void sequencer_callback(unsigned int time, fluid_event_t *event, fluid_sequencer_t *seq, void *data)
+{
+    schedule_timer_event(data);
+    schedule_riff_pattern(data);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+    AVFilterLink *outlink = ctx->outputs[0];
+    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->framecount%((int)s->changerate) == 0) {
+        schedule_riff_pattern(s);
+        schedule_timer_event(s);
+    }
+    
+    fluid_synth_write_float(s->synth, nb_samples, frame->data[0], 0, 2, frame->data[0], 1, 2);
+    
+    if (!s->infinite)
+        s->duration -= nb_samples;
+    
+    s->framecount++;
+    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,
+        .config_props  = config_props,
+    },
+    { NULL }
+};
+
+AVFilter ff_asrc_atone = {
+    .name          = "atone",
+    .description   = NULL_IF_CONFIG_SMALL("Generate algorithmic riff music."),
+    .query_formats = query_formats,
+    .init          = init,
+    .uninit        = uninit,
+    .activate      = activate,
+    .priv_size     = sizeof(AtoneContext),
+    .inputs        = NULL,
+    .outputs       = atone_outputs,
+    .priv_class    = &atone_class,
+};
+
+
diff --git a/libavfilter/notedef.h b/libavfilter/notedef.h
new file mode 100644
index 0000000000..b7f4071b22
--- /dev/null
+++ b/libavfilter/notedef.h
@@ -0,0 +1,264 @@
+/*
+ * 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
+ */
+#ifndef AVFILTER_NOTEDEF_H
+#define AVFILTER_NOTEDEF_H
+#include <stdlib.h>
+#include<string.h>
+
+/*Define notes as per the General Midi specifications 
+*_ = minus, s = sharp, b = flat
+*   H = hold tone, R = Rest*/
+enum notes{C_1, Cs_1, Db_1 = 1, D_1, Ds_1, Eb_1 =3, E_1, F_1, Fs_1, Gb_1 = 6, G_1, Gs_1, Ab_1 = 8, A_1, As_1, Bb_1 =10, B_1,
+            C0, Cs0, Db0 = 13, D0, Ds0, Eb0 = 15, E0, F0, Fs0, Gb0 = 18, G0, Gs0, Ab0 = 20, A0, As0, Bb0 = 22, B0,
+            C1, Cs1, Db1 = 25, D1, Ds1, Eb1 = 27, E1, F1, Fs1, Gb1 = 30, G1, Gs1, Ab1 = 32, A1, As1, Bb1 = 34, B1,
+            C2, Cs2, Db2 = 37, D2, Ds2, Eb2 = 39, E2, F2, Fs2, Gb2 = 42, G2, Gs2, Ab2 = 44, A2, As2, Bb2 = 46, B2,
+            C3, Cs3, Db3 = 49, D3, Ds3, Eb3 = 51, E3, F3, Fs3, Gb3 = 54, G3, Gs3, Ab3 = 56, A3, As3, Bb3 = 58, B3,
+            C4, Cs4, Db4 = 61, D4, Ds4, Eb4 = 63, E4, F4, Fs4, Gb4 = 66, G4, Gs4, Ab4 = 68, A4, As4, Bb4 = 70, B4,
+            C5, Cs5, Db5 = 73, D5, Ds5, Eb5 = 75, E5, F5, Fs5, Gb5 = 78, G5, Gs5, Ab5 = 80, A5, As5, Bb5 = 82, B5,
+            C6, Cs6, Db6 = 85, D6, Ds6, Eb6 = 87, E6, F6, Fs6, Gb6 = 90, G6, Gs6, Ab6 = 92, A6, As6, Bb6 = 94, B6,
+            C7, Cs7, Db7 = 97, D7, Ds7, Eb7 = 99, E7, F7, Fs7, Gb7 = 102, G7, Gs7, Ab7 = 104, A7, As7, Bb7 = 106, B7,
+            C8, Cs8, Db8 = 109, D8, Ds8, Eb8 = 111, E8, F8, Fs8, Gb8 = 114, G8, Gs8, Ab8 = 116, A8, As8, Bb8 = 118, B8,
+            C9, Cs9, Db9 = 121, D9, Ds9, Eb9 = 123, E9, F9, Fs9, Gb9 = 126, G9, H, R};
+
+const char *GM_instrument_list[128] = {"Acoustic-Grand", "Bright-Acoustic", "Electric-Grand", "Honky-Tonk", "Electric-Piano-1", "Electric-Piano-2", 
+"Harpsichord", "Clav", "Celesta", "Glockenspiel", "Music-Box", "Vibraphone", "Marimba", "Xylophone", "Tubular-Bells", "Dulcimer", "Drawbar-Organ", 
+"Percussive-Organ", "Rock-Organ", "Church-Organ", "Reed-Organ", "Accordion", "Harmonica", "Tango-Accordion", "Acoustic-Guitar-nylon", "Acoustic-Guitar-steel", 
+"Electric-Guitar-jazz","Electric-Guitar-clean", "Electric-Guitar-muted", "Overdriven-Guitar", "Distortion-Guitar", "Guitar-Harmonics",
+"Acoustic-Bass", "Electric-Bass-finger", "Electric-Bass-pick", "Fretless-Bass", "Slap-Bass-1", "Slap-Bass-2", "Synth-Bass-1", "Synth-Bass-2",
+ "Violin", "Viola", "Cello", "Contrabass", "Tremolo-Strings", "Pizzicato-Strings", "Orchestral-Harp", "Timpani", "String-Ensemble-1", "String-Ensemble-2", 
+ "SynthStrings-1", "SynthStrings-2", "Choir-Aahs", "Voice-Oohs", "Synth-Voice", "Orchestra-Hit", "Trumpet", "Trombone", "Tuba",
+ "Muted-Trumpet", "French-Horn", "Brass-Section", "SynthBrass-1", "SynthBrass-2", "Soprano-Sax", "Alto-Sax", "Tenor-Sax", "Baritone-Sax", 
+ "Oboe", "English-Horn", "Bassoon", "Clarinet", "Piccolo", "Flute", "Recorder", "Pan-Flute", "Blown-Bottle", "Shakuhachi", "Whistle", "Ocarina", 
+ "Lead-1-square", "Lead-2-sawtooth", "Lead-3-calliope", "Lead-4-chiff", "Lead-5-charang", "Lead-6-voice", "Lead-7-fifths", "Lead-8-bass+lead", 
+ "Pad-1-new-age", "Pad-2-warm", "Pad-3-polysynth", "Pad-4-choir", "Pad-5-bowed", "Pad-6-metallic", "Pad-7-halo", "Pad-8-sweep", 
+ "FX-1-rain", "FX-2-soundtrack", "FX-3-crystal", "FX-4-atmosphere", "FX-5-brightness", "FX-6-goblins", "FX-7-echoes", "FX-8-sci-fi",
+  "Sitar", "Banjo", "Shamisen", "Koto", "Kalimba", "Bagpipe", "Fiddle", "Shanai", "Tinkle-Bell", "Agogo", "Steel-Drums", "Woodblock", "Taiko-Drum",
+   "Melodic-Tom", "Synth-Drum", "Reverse-Cymbal", "Guitar-Fret-Noise", "Breath-Noise", "Seashore", "Bird-Tweet", "Telephone-Ring", "Helicopter", 
+   "Applause", "Gunshot"};
+
+enum percussion_notes{Metronome_Click = 33, Metronome_Bell, Acoustic_Bass_Drum,  Bass_Drum_1,  Side_Stick,  Acoustic_Snare,  Hand_Clap,  Electric_Snare,  Low_Floor_Tom, 
+ Closed_Hi_Hat,  High_Floor_Tom,  Pedal_Hi_Hat,  Low_Tom,  Open_Hi_Hat,  Low_Mid_Tom,  Hi_Mid_Tom,  Crash_Cymbal_1,  High_Tom,  Ride_Cymbal_1,  Chinese_Cymbal,
+  Ride_Bell, Tambourine,  Splash_Cymbal, Cowbell,  Crash_Cymbal_2, Vibraslap,  Ride_Cymbal_2, Hi_Bongo,  Low_Bongo,  Mute_Hi_Conga,  Open_Hi_Conga,  Low_Conga, 
+   High_Timbale,  Low_Timbale,  High_Agogo,  Low_Agogo, Cabasa, Maracas,  Short_Whistle,  Long_Whistle,  Short_Guiro,  Long_Guiro, Claves,  Hi_Wood_Block,  
+   Low_Wood_Block, Mute_Cuica,  Open_Cuica,  Mute_Triangle, Open_Triangle};
+
+/*Assuming maximum of three percussion instruments can be played at the same time*/
+typedef struct{
+    unsigned int instrument_1;
+    unsigned int instrument_2;
+    unsigned int instrument_3;
+    unsigned int beat;
+}percussion_structure;
+
+typedef struct
+{
+    unsigned int length;
+    percussion_structure note[];
+}percussion;
+
+/*Define some drum beats...
+Beat: Whole note = 1, Half note = 2, Quater note = 4, ..., Number of beats: Whole note = 4/1, Half note = 4/2, Quater note = 4/4
+Note 1 does not produce any sound*/
+#define jazz1 {12,  {{Bass_Drum_1, Ride_Cymbal_2, 1, 12},\
+                    {1, 1, 1, 12}, \
+                    {Bass_Drum_1, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, 1, 12}, \
+                    {Bass_Drum_1, Ride_Cymbal_2, 1, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Bass_Drum_1, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, 1, 12}}}
+#define jazz2 {12, {{1, Ride_Cymbal_2, 1, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Bass_Drum_1, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Bass_Drum_1, Ride_Cymbal_2, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Bass_Drum_1, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Bass_Drum_1, Ride_Cymbal_2, 1, 12}}}
+#define jazz3 {12, {{1, Ride_Cymbal_2, 1, 12},\
+                    {1, 1, 1, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}}}
+#define jazz4 {12, {{1, Ride_Cymbal_2, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}}}
+#define jazz5 {12, {{Electric_Snare, Ride_Cymbal_2, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {Bass_Drum_1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {Bass_Drum_1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}}}
+#define jazz6 {12, {{1, Ride_Cymbal_2, 1, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {Electric_Snare, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}, \
+                    {1, 1, 1, 12}, \
+                    {Bass_Drum_1, 1, 1, 12}, \
+                    {Electric_Snare, Ride_Cymbal_2, Pedal_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, Ride_Cymbal_2, 1, 12}}}
+#define rock1 {8, {{Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}, \
+                    {Acoustic_Snare, 1, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Acoustic_Snare, 1, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}}}
+#define rock2 {8, {{Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Acoustic_Snare, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}}}
+#define rock3 {8, {{Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Acoustic_Snare, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {Acoustic_Snare, 1, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}}}
+#define rock4 {8, {{Bass_Drum_1, Acoustic_Snare, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, Acoustic_Snare, Closed_Hi_Hat, 8}, \
+                    {1, 1, Closed_Hi_Hat, 8}, \
+                    {1, Acoustic_Snare, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}, \
+                    {1, Acoustic_Snare, Closed_Hi_Hat, 8}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 8}}}
+#define shuffle {12, {{Bass_Drum_1, 1, Closed_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, 1, Closed_Hi_Hat, 12}, \
+                    {Acoustic_Snare, 1, Closed_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, 1, Closed_Hi_Hat, 12}, \
+                    {Bass_Drum_1, 1, Closed_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, 1, Closed_Hi_Hat, 12}, \
+                    {Acoustic_Snare, 1, Closed_Hi_Hat, 12}, \
+                    {1, 1, 1, 12}, \
+                    {1, 1, Closed_Hi_Hat, 12}}}
+#define metronome {4, {{Metronome_Click, 1, 1, 4}, \
+                        {Metronome_Click, 1, 1, 4}, \
+                        {Metronome_Click, 1, 1, 4}, \
+                        {Metronome_Click, 1, 1, 4}}}
+
+const percussion Track_1 = jazz1;
+const percussion Track_2 = jazz2;
+const percussion Track_3 = jazz3;
+const percussion Track_4 = jazz4;
+const percussion Track_5 = jazz5;
+const percussion Track_6 = jazz6;
+const percussion Track_7 = rock1;
+const percussion Track_8 = rock2;
+const percussion Track_9 = rock3;
+const percussion Track_10 = rock4;
+const percussion Track_11 = shuffle;
+const percussion Track_12 = metronome;
+
+const char *percussion_tracks[] = {"Jazz1", "Jazz2", "Jazz3", "Jazz4", "Jazz5", "Jazz6", "Rock1", "Rock2", "Rock3", "Rock4", "Shuffle", "Metronome"};
+
+/*Define the riffs : 8 notes per riff
+Refernce: http://peterlangston.com/Papers/amc.pdf */
+#define NPR 8 
+const int riff[] = {Eb4,  D4,  A4,  F4,  E4,  C5,  A4,  A4,  /*  0 */
+                F4,  A4, Eb5,  D5,  E4,  A4,  C5,  A4,  /*  1 */
+                Ab4,  A4,   H,  G5,   H,  Eb5,  C5,  E5,  /*  2 */
+                Ab4,  A4,  B4,  C5, Eb5,  E5, Ab5,  A5,  /*  3 */
+                A4,  Bb4,  B4,  C5, Db5,  D5, Eb5,  E5,  /*  4 */
+                A4,  Bb4,  B4,  C5,  E5, Eb5,  D5,  C5,  /*  5 */
+                A4,  B4,  C5,  A4,  B4,  C5,  D5,  B4,  /*  6 */
+                A4,  B4,  C5,  D5, Eb5,  E5, Eb5,  C5,  /*  7 */
+                A4,  C5,  D5, Eb5,  Gb5,  Ab5,  A5,  C6,  /*  8 Pat  Metheny  */
+                A4,  C5, Eb5,  B4,  D5,  F5, Eb5,  C5,  /*  9 */
+                A4,  C5,  E5,  G5,  B5,  A5,  G5,  E5,  /* 10  */
+                A4,  C5,  E5,  A5,  G5, Eb5,  C5,  A4,  /* 11  */
+                B4,  A4,  B4,  C5,  B4,  A4,  B4,  C5,  /* 12  */
+                B4,  A4,  B4,  C5,  B4,  C5,  B4,  A4,  /* 13  */
+                B4,  A4,  B4,  C5,  D5,  C5,  D5, Eb5,  /* 14  */
+                C5, Ab4,  A4,  G5,  F5, Gb5, Eb5,  E5,  /* 15 Marty Cutler */
+                C5,  D5,  C5,  B4,  C5,  B4,  A4,   H,  /* 16  */
+                C5,  D5, Eb5,  C5,  D5, Eb5,  F5,  D5,  /* 17  */
+                D5,  C5,  A4,  C5,  E5, Eb5,  D5,  C5,  /* 18  */
+                D5,  C5,  D5, Eb5,  D5,  C5,  D5, Eb5,  /* 19  */
+                D5,  Eb5,  E5,  F5, Gb5,  G5, Ab5,  A5,  /* 20  */
+                D5, Eb5,  G5, Eb5,  D5,  C5,  B4,  C5,  /* 21 Charlie Keagle */
+                D5,  Eb5,  A5,  D5,   H,  C5,  A4,  E4,  /* 22  */
+                D5,  E5,  G5,  E5,  C5,   H,  D5,  A5,  /* 23  Lyle  Mays/Steve  Cantor  */
+                Eb5,  D5, Eb5,  D5,   H,  C5,  A4,   H,  /* 24  */
+                Eb5,  D5, Eb5,  F5, Eb5,  D5,  C5,  B4,  /* 25  */
+                Eb5,  E5,  D5,  C5,  B4,  A4, Ab4,  A4,  /* 26  Richie  Shulberg  */
+                Eb5,  E5,  A5,  C5,  B4,  E5,  A4,  A4,  /* 27  */
+                Eb5,  Gb5,  E5,  A4,  B4,  D5,  C5,  E4,  /* 28  Django  Rheinhart  */
+                E5,  A4,  C5, Ab4,  B4,  G4, Gb4,  E4,  /* 29  David  Levine  */
+                E5,  Eb5,  D5,  C5,  B4,  C5,  D5,  F5,  /* 30  */
+                G5,  E5,  D5,  B4, Eb5,   H,  C5,  A4,  /* 31  */
+                G5,  E5,  D5, Gb5,  C5,   H,  A4,   H,  /* 32  Mike  Cross  */
+                Ab5,  A5, Ab5,  A5, Ab5,  A5, Ab5,  A5,  /* 33  Django  Rheinhart  */
+                A5,  E5,  C5,  G4,  C5,  E5,  A5,  A5,  /* 34  Django  Rheinhart  */
+                A5,  E5,  C5,  A4,  G5, Eb5,  C5,  A4,  /* 35  */
+                A5,  B5,  G5,  E5,  F5, Gb5,  G5, Ab5,  /* 36  */
+                B5,  C6,  A5,  E5,  G5,  B5,  A5,   H,  /* 37  */
+                B5,  D6,  C6,  E5, Ab5,  B5,  A5,  C5,  // 38  Django  Rheinhart  
+                C6,  B5,  A5,  G5, Gb5,  E5, Eb5,  C5} ;/* 39  */
+
+typedef struct lsys
+{
+    int note;
+    int dur;
+}lsys;
+#define L_MAX_LENGTH 45000
+#endif/*AVFILTER_NOTEDEF_H*/ 
+
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 37015085fa..308fbe07c3 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  86
+#define LIBAVFILTER_VERSION_MINOR  87
 #define LIBAVFILTER_VERSION_MICRO 100
 
 
