[FFmpeg-devel,GSoC] audio filter - Generate algorithmic riff music

On 6/5/20, Ashutosh Pradhan <ashutoshp012345@gmail.com> wrote:
> diff --git a/Changelog b/Changelog
> index 711c843b99..905b91b570 100644
> --- a/Changelog
> +++ b/Changelog
> @@ -75,7 +75,7 @@ version <next>:
>  - PFM decoder
>  - dblur video filter
>  - Real War KVAG muxer
> -
> +- atone filter
>
>  version 4.2:
>  - tpad filter
> diff --git a/configure b/configure
> index 8569a60bf8..954e35d62c 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
> @@ -3484,6 +3486,7 @@ 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"
> @@ -6304,6 +6307,7 @@ 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 f76604c51e..fc34f76bee 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -6125,6 +6125,62 @@ 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.

Doesn't those two can be set per note, thus making it little weird to be global?

> +
> +@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..a6a8b8167d
> --- /dev/null
> +++ b/libavfilter/asrc_atone.c
> @@ -0,0 +1,481 @@
> +/*
> + * 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;

Please keep style same as other code, so use "AVClass *class".
Look for all other such cases.

> +    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;

ditto.

> +    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;
> +
> +}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 void set_percussion_track(AtoneContext *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){

Style issue missing space between ) and {.
Please fix all such similar cases.

> +        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;
> +    srand(getpid());

srand can not be used, it is not portable.

Please for random numbers use av_lfg and and av_get_random_seed from libavutil.

> +    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));
> +
> +    for (int i = 0; i < s->numriffs*NPR ; i++)
> +        s->riffs[i] = riff[i];
> +
> +    set_percussion_track(s);
> +    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 void set_percussion_track(AtoneContext *s){
> +    int i;
> +
> +    for (i = 0 ; i < sizeof(percussion_tracks)/sizeof(percussion_tracks[0])
> ; i++)
> +        if (strcmp(percussion_tracks[i], s->track_name) == 0)
> +            break;
> +
> +    switch (i)
> +    {

{ of switch should be put in same line as switch string.

> +    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;
> +    }
> +}
> +
> +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;
> +
> +    min = 999;
> +    for (int i = 2; i >= 0; i--)
> +    {
> +        riff = (rand()%RAND_MAX)%s->numriffs;

As already mentioned, do not use rand().

> +        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};
> +
> +    for (int i = 0; i < NPR; i++)
> +    {
> +        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 void play_percussion(AtoneContext *s)
> +{
> +    int note_time = s->time_marker;
> +
> +    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;
> +
> +    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()%RAND_MAX)%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 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->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,
> +        .request_frame = request_frame,

Change to activate API, so last PTS is correct.
See libavfilter/asrc_anoisesrc for more info.

> +        .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,
> +    .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..8534d6d827
> --- /dev/null
> +++ b/libavfilter/notedef.h
> @@ -0,0 +1,257 @@
> +/*
> + * 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  */
> +#endif/*AVFILTER_NOTEDEF_H*/
> +
> diff --git a/libavfilter/version.h b/libavfilter/version.h
> index 980d9baca3..96b14d6794 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  84
> +#define LIBAVFILTER_VERSION_MINOR  85
>  #define LIBAVFILTER_VERSION_MICRO 100
>
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".

On Sun, Jun 14, 2020 at 10:34 PM Paul B Mahol <onemda@gmail.com> wrote:

> On 6/5/20, Ashutosh Pradhan <ashutoshp012345@gmail.com> wrote:
> > diff --git a/Changelog b/Changelog
> > index 711c843b99..905b91b570 100644
> > --- a/Changelog
> > +++ b/Changelog
> > @@ -75,7 +75,7 @@ version <next>:
> >  - PFM decoder
> >  - dblur video filter
> >  - Real War KVAG muxer
> > -
> > +- atone filter
> >
> >  version 4.2:
> >  - tpad filter
> > diff --git a/configure b/configure
> > index 8569a60bf8..954e35d62c 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
> > @@ -3484,6 +3486,7 @@ 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"
> > @@ -6304,6 +6307,7 @@ 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 f76604c51e..fc34f76bee 100644
> > --- a/doc/filters.texi
> > +++ b/doc/filters.texi
> > @@ -6125,6 +6125,62 @@ 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.
>
> Doesn't those two can be set per note, thus making it little weird to be
> global?
>
Yeah, it can be set per note but how should I make it(velocity/volume) a
user-defined input then?


>
> > +
> > +@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..a6a8b8167d
> > --- /dev/null
> > +++ b/libavfilter/asrc_atone.c
> > @@ -0,0 +1,481 @@
> > +/*
> > + * 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;
>
> Please keep style same as other code, so use "AVClass *class".
> Look for all other such cases.
>
Will fix

> > +    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;
>
> ditto.
>
> > +    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;
> > +
> > +}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 void set_percussion_track(AtoneContext *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){
>
> Style issue missing space between ) and {.
> Please fix all such similar cases.
>
Will fix

>
> > +        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;
> > +    srand(getpid());
>
> srand can not be used, it is not portable.
>
> Please for random numbers use av_lfg and and av_get_random_seed from
> libavutil.
>
Will change

>
> > +    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));
> > +
> > +    for (int i = 0; i < s->numriffs*NPR ; i++)
> > +        s->riffs[i] = riff[i];
> > +
> > +    set_percussion_track(s);
> > +    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 void set_percussion_track(AtoneContext *s){
> > +    int i;
> > +
> > +    for (i = 0 ; i <
> sizeof(percussion_tracks)/sizeof(percussion_tracks[0])
> > ; i++)
> > +        if (strcmp(percussion_tracks[i], s->track_name) == 0)
> > +            break;
> > +
> > +    switch (i)
> > +    {
>
> { of switch should be put in same line as switch string.
>
> > +    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;
> > +    }
> > +}
> > +
> > +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;
> > +
> > +    min = 999;
> > +    for (int i = 2; i >= 0; i--)
> > +    {
> > +        riff = (rand()%RAND_MAX)%s->numriffs;
>
> As already mentioned, do not use rand().
>
> > +        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};
> > +
> > +    for (int i = 0; i < NPR; i++)
> > +    {
> > +        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 void play_percussion(AtoneContext *s)
> > +{
> > +    int note_time = s->time_marker;
> > +
> > +    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;
> > +
> > +    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()%RAND_MAX)%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 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->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,
> > +        .request_frame = request_frame,
>
> Change to activate API, so last PTS is correct.
> See libavfilter/asrc_anoisesrc for more info.
>
will change

>
> > +        .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,
> > +    .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..8534d6d827
> > --- /dev/null
> > +++ b/libavfilter/notedef.h
> > @@ -0,0 +1,257 @@
> > +/*
> > + * 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  */
> > +#endif/*AVFILTER_NOTEDEF_H*/
> > +
> > diff --git a/libavfilter/version.h b/libavfilter/version.h
> > index 980d9baca3..96b14d6794 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  84
> > +#define LIBAVFILTER_VERSION_MINOR  85
> >  #define LIBAVFILTER_VERSION_MICRO 100
> >
> >
> > _______________________________________________
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> > ffmpeg-devel@ffmpeg.org
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> >
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