[FFmpeg-devel] [PATCH v2]libavfilter/asrc_atone.c : generate algorithmic music
Ashutosh Pradhan
ashutoshp012345 at gmail.com
Wed Aug 12 14:26:50 EEST 2020
Generate algorithmic music using riffs, lindenmayer systems, cellular automaton and rythm algorithms.
Changelog | 1 +
configure | 4 +
doc/filters.texi | 141 +++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/asrc_atone.c | 1324 ++++++++++++++++++++++++++++++++++++++++++++++
libavfilter/notedef.h | 278 ++++++++++
libavfilter/version.h | 2 +-
8 files changed, 1751 insertions(+), 1 deletion(-)
diff --git a/Changelog b/Changelog
index 0108f8f1a8..0d759b7eb7 100644
--- a/Changelog
+++ b/Changelog
@@ -89,6 +89,7 @@ version 4.3:
- PFM decoder
- dblur video filter
- Real War KVAG muxer
+- atone filter
version 4.2:
diff --git a/configure b/configure
index 8de1afcb99..783bae8a03 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 atone source filter [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]
@@ -1774,6 +1775,7 @@ EXTERNAL_LIBRARY_LIST="
libdc1394
libdrm
libflite
+ libfluidsynth
libfontconfig
libfreetype
libfribidi
@@ -3493,6 +3495,7 @@ 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"
@@ -6336,6 +6339,7 @@ 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 d8cd45066a..0e809977b1 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6128,6 +6128,147 @@ anoisesrc=d=60:c=pink:r=44100:a=0.5
@end example
@end itemize
+ at section atone
+
+Generate algorithmic music.
+To compile filter configure ffmpeg with @code{--enable-libfluidsynth}
+
+The filter accepts the following options:
+
+ at table @option
+ at item sample_rate, r
+Specify the sample rate. Default value is 44100 Hz.
+
+ at item nb_samples
+Set the number of samples per each output frame. Default is 1024.
+
+ at item sfont
+Specify the location of soundfont file. Default value is
+"/usr/share/sounds/sf2/FluidR3_GM.sf2"(for ubuntu linux). Recommended to
+use the FluidR3_GM general midi soundfont file.
+
+ at item duration, d
+Specify the duration of the generated audio stream. Not specifying this option
+results in playing tones for infinite length.
+
+ at item velocity, v
+Specify the velocity of key press. Default value is 80.
+
+ at item p_velocity
+Specify the velocity of key press for percussion track. Default value is 80.
+
+ at item bpm
+Specify the beats per minute. Default is 80.
+
+ at item algo
+Specify the algorithm type. Available options are riffs, lsystem, ca(cellular_automaton)
+and rythm. Default is ca.
+
+ at item instrument
+Specify the instrument for riffs and Lindenmayer system. Available instruments are Acoustic-Grand,
+Bright-Acoustic, ... as defined in the General Midi specifications. Default is Acoustic-Grand.
+
+ at item percussion
+Specify the percussion track for beats. Available options are Jazz1,
+Jazz2, ..., Jazz6, Rock1...4, Shuffle, Metronome. Default is Metronome.
+
+ at item numbars
+Set the number of bars in which riff energy will change between 0 to 8. Default is 2.
+
+ at item scale
+Set the scale for Lindenmayer system and cellular automaton. Specify as root note_scale type.
+Specify scale types as major, n_minor for natural minor, m_minor for melodic minor, h_minor
+as harmonic minor, p_major for pentatonic major, p_minor for pentatonic minor and blues for
+blues scale. The root note is specified as C or Cs or Db for C or C sharp or D flat respectively.
+So scale specified as C_n_minor, Cs_p_major, etc. Default is C_major.
+
+ at item height
+Set the height for mapping of scale for cellular automaton and Lindenmayer system.
+It will map the upper and lower octaves. The range is from 10 to 25. Default value is 20.
+
+ at item axiom
+Set the axiom for Lindenmayer system. Enter as combination of C, F, X, m, p, D. The symbols are
+decoded as F-> increase note duration by factor of 2, X-> rest note, p-> move up in the scale
+by one note, m-> move down in the scale by one note, C-> push current state, D-> set note
+state to initial state. Default is "CFppFmmXD".
+
+ at item rule1
+Set the rule 1 in the Lindenmayer system. Specify as "symbol"to"conversion". The rule is substituted
+in the axiom till the specified number of generations. Default is "XtoFCppppFmmmmXDCmmFpppD".
+
+ at item rule2
+Set the rule 2 in the Lindenmayer system. Default is "FtoCppppFmmmFpppFD".
+
+ at item gen
+Set the number of generations to compute in the Lindenmayer system. In each generation, the symbol
+is converted as specified in rule1 and rule2. The 0th generation is axiom.
+
+ at item ruletype
+Set the ruletype for cellular automaton. Recommended rule types are 7, 15, 31, 55, 61, 79, 91, 103,
+110, 157, 167, 773, 1047, 1585. It is to decide the neighbor cells for computation. 7 gives neighbor
+cells as -1, 0, 1 and similar for other rules. Default is 31.
+
+ at item rule
+Set the rule for cellular automaton. The range should be from 0 to 2^(2^number of neighbors) - 1.
+Default value is 367921.
+
+ at item boundary
+Set the boundary type for cellular automaton. Allowed options are infinite and cyclic.
+Default is cyclic.
+
+ at item bass_instr
+Set the bass instrument for cellular automaton. Available instruments are Acoustic-Grand,
+Bright-Acoustic, ... as defined in the General Midi specifications. Default is Acoustic-Grand.
+
+ at item chord_instr
+Set the chords instrument for cellular automaton. Available instruments are Acoustic-Grand,
+Bright-Acoustic, ... as defined in the General Midi specifications. Default is Acoustic-Grand.
+
+ at item lead_instr
+Set the lead instrument for cellular automaton. Available instruments are Acoustic-Grand,
+Bright-Acoustic, ... as defined in the General Midi specifications. Default is Acoustic-Grand.
+
+ at item bass
+Set the bass algorithm for cellular automaton. Available options are lowest_notes and lower_eighth.
+Default is lowest_notes.
+
+ at item chords
+Set the chords algorithm for cellular automaton. Available options are eighth, whole. Default is eighth
+
+ at item lead
+Set the lead algorithm for cellular automaton. Available options are upper_eighth, upper_whole,
+lower_eighth, lower_whole. Default is upper_eighth.
+
+ at item r_algo
+Set the type of rythm algorithm. Available options are padriddle, toggle, alternate, togpad for
+toggle and padriddle, altpad for alternate and padriddle, togalt for toggle and alternate.
+Reference for the algorithms taken from
+http://cgm.cs.mcgill.ca/~godfried/publications/Hawaii-Paper-Rhythm-Generation.pdf. Default is
+altpad.
+
+ at item maxres
+Set the maximum resolution for the rythm algorithm. Specify as 4 to have maximum resolution as
+quarter notes, 8 for eighth notes, 16 for sixteenth notes and so on for 32 and 64. Default is 16.
+
+ at item density
+Set the expected density of notes in the rythm algorithm as a percentage. Range is 1 to 100.
+Default is 75.
+
+ at end table
+
+ at subsection Examples
+
+ at itemize
+
+ at item
+Generate 10 seconds of riff music, with a key velocity of 100, instrument as Electric Guitar(jazz)
+and percussion track as Jazz3:
+ at example
+atone=algo=riffs:d=10:v=100:sfont="example.sf2":instrument=Electric-Guitar-Jazz:percussion=Jazz3
+atone=algo=riffs:duration=10:velocity=100:sfont="example.sf2":instrument=Electric-Guitar-Jazz:percussion=Jazz3
+ at end example
+ at end itemize
+
@section hilbert
Generate odd-tap Hilbert transform FIR coefficients.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 0dc74f8b70..c4300a8594 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -148,6 +148,7 @@ OBJS-$(CONFIG_AEVALSRC_FILTER) += aeval.o
OBJS-$(CONFIG_AFIRSRC_FILTER) += asrc_afirsrc.o
OBJS-$(CONFIG_ANOISESRC_FILTER) += asrc_anoisesrc.o
OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
+OBJS-$(CONFIG_ATONE_FILTER) += asrc_atone.o
OBJS-$(CONFIG_FLITE_FILTER) += asrc_flite.o
OBJS-$(CONFIG_HILBERT_FILTER) += asrc_hilbert.o
OBJS-$(CONFIG_SINC_FILTER) += asrc_sinc.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 3f70153986..a9d9c4b5a7 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -142,6 +142,7 @@ extern AVFilter ff_asrc_aevalsrc;
extern AVFilter ff_asrc_afirsrc;
extern AVFilter ff_asrc_anoisesrc;
extern AVFilter ff_asrc_anullsrc;
+extern AVFilter ff_asrc_atone;
extern AVFilter ff_asrc_flite;
extern AVFilter ff_asrc_hilbert;
extern AVFilter ff_asrc_sinc;
diff --git a/libavfilter/asrc_atone.c b/libavfilter/asrc_atone.c
new file mode 100644
index 0000000000..fa45a02f8e
--- /dev/null
+++ b/libavfilter/asrc_atone.c
@@ -0,0 +1,1324 @@
+/*
+ * 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 "libavutil/common.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;
+ int velocity;
+ int percussion_velocity;
+ 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;
+
+ char *axiom;
+ char *rule1;
+ char *rule2;
+ char *prevgen;
+ char *nextgen;
+ lsys *system;
+ int generations;
+ int lstate;
+ int max;
+
+ int ca_cells[32];
+ int ca_nextgen[32];
+ int *ca_neighbours;
+ int *ca_8keys[8];
+ int *ca_ruleset;
+ int *note_map;
+ int *scale;
+ int ca_boundary;
+ int ca_rule;
+ int ca_ruletype;
+ int height;
+ int ca_nsize;
+ void (*ca_generate)(int *curr, int *next, int *keys, int *nbor, int *ruleset, int size, int height, AVLFG *rand);
+ char *scale_name;
+ int last_bass_note;
+ int last_lead_note;
+ void (*schedule_pattern)(void *t);
+ int algorithm;
+ void (*ca_bass)(void *t);
+ void (*ca_chords)(void *t);
+ void (*ca_lead)(void *t);
+ int ca_bass_name;
+ int ca_chords_name;
+ int ca_lead_name;
+ char *chords_instr;
+ char *bass_instr;
+ char *lead_instr;
+
+ int *p_instr;
+ int *p_beats;
+ int p_maxres;
+ int p_density;
+ int p_barstate;
+ int p_algorithm;
+}AtoneContext;
+
+#define OFFSET(x) offsetof(AtoneContext, x)
+#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+enum boundary {
+ INFINITE,
+ CYCLIC
+};
+
+enum bass_algorithm {
+ B_LOWEST_NOTES,
+ B_LOWER_EIGHTH
+};
+
+enum chord_algorithm {
+ C_EIGHTH,
+ C_WHOLE
+};
+
+enum lead_algortihm {
+ L_UPPER_EIGHTH,
+ L_UPPER_WHOLE,
+ L_LOWER_EIGHTH,
+ L_LOWER_WHOLE
+};
+
+enum rythm_algorithm {
+ PADRIDDLE,
+ TOGGLE,
+ ALTERNATE,
+ TOGPAD,
+ ALTPAD,
+ TOGALT
+};
+
+enum algorithm {
+ RIFFS,
+ LSYSTEM,
+ CA,
+ RYTHM
+};
+
+enum algo_channel{
+ RIFFNL,
+ CA_BASS,
+ CA_LEAD,
+ CA_CHORDS,
+ PERCUSSION = 9
+};
+
+static const AVOption atone_options[] = {
+ {"velocity", "set velocity of key press", OFFSET(velocity), AV_OPT_TYPE_INT, {.i64 = 80}, 0, 127, FLAGS},
+ {"v", "set velocity of key press", OFFSET(velocity), AV_OPT_TYPE_INT, {.i64 = 80}, 0, 127, FLAGS},
+ {"p_velocity", "set percussion velocity", OFFSET(percussion_velocity), AV_OPT_TYPE_INT, {.i64 = 80}, 0, 127, FLAGS},
+ {"sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT_MAX, FLAGS},
+ {"r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT_MAX, FLAGS},
+ {"duration", "set duration in seconds", OFFSET(duration), AV_OPT_TYPE_DURATION,{.i64 = 0}, 0, INT64_MAX, FLAGS},
+ {"d", "set duration in seconds", OFFSET(duration), AV_OPT_TYPE_DURATION,{.i64 = 0}, 0, INT64_MAX, FLAGS},
+ {"nb_samples", "set number of samples per frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS},
+ {"bpm", "set beats per minute", OFFSET(beats_pm), AV_OPT_TYPE_INT, {.i64 = 80}, 1, INT_MAX, FLAGS},
+ {"sfont", "set the path to soundfont file", OFFSET(sfont), AV_OPT_TYPE_STRING, {.str = "/usr/share/sounds/sf2/FluidR3_GM.sf2"}, 0, 0, FLAGS},
+ {"instrument", "set instrument for riff and L system", OFFSET(instrument), AV_OPT_TYPE_STRING, {.str = "Acoustic-Grand"}, 0, 0, FLAGS},
+ {"percussion", "set percussion track", OFFSET(track_name), AV_OPT_TYPE_STRING, {.str = "Metronome"}, 0, 0, FLAGS},
+ {"numbars", "set number of bars in riff", OFFSET(numbars), AV_OPT_TYPE_INT, {.i64 = 2}, 2, 8, FLAGS},
+ {"axiom", "set the L system axiom", OFFSET(axiom), AV_OPT_TYPE_STRING, {.str = "CFppFmmXD"}, 0, 0, FLAGS},
+ {"rule1", "set rule1 of L system", OFFSET(rule1), AV_OPT_TYPE_STRING, {.str = "XtoFCppppFmmmmXDCmmFpppD"}, 0, 0, FLAGS},
+ {"rule2", "set rule2 of L system", OFFSET(rule2), AV_OPT_TYPE_STRING, {.str = "FtoCppppFmmmFpppFD"}, 0, 0, FLAGS},
+ {"gen", "set no of generations of L system", OFFSET(generations), AV_OPT_TYPE_INT, {.i64 = 3}, 0, INT_MAX, FLAGS},
+ {"ruletype", "set ruletype of cellular automaton", OFFSET(ca_ruletype), AV_OPT_TYPE_INT, {.i64 = 31}, 0, INT_MAX, FLAGS},
+ {"rule", "set rule of cellular automaton", OFFSET(ca_rule), AV_OPT_TYPE_INT, {.i64 = 367921},0, INT_MAX, FLAGS},
+ {"height", "set height for mapping of scale ", OFFSET(height), AV_OPT_TYPE_INT, {.i64 = 20}, 10,25, FLAGS},
+ {"bass_instr", "set bass instrument of cellular automaton", OFFSET(bass_instr), AV_OPT_TYPE_STRING, {.str = "Acoustic-Grand"}, 0, 0, FLAGS},
+ {"chord_instr", "set chords instrument of cellular automaton", OFFSET(chords_instr), AV_OPT_TYPE_STRING, {.str = "Acoustic-Grand"}, 0, 0, FLAGS},
+ {"lead_instr", "set lead instrument of cellular automaton", OFFSET(lead_instr), AV_OPT_TYPE_STRING, {.str = "Acoustic-Grand"}, 0, 0, FLAGS},
+ {"scale", "set scale for cellular automaton and L system",OFFSET(scale_name), AV_OPT_TYPE_STRING, {.str = "C_major"}, 0, 0, FLAGS},
+ {"bass", "set bass algorithm for cellular automaton", OFFSET(ca_bass_name), AV_OPT_TYPE_INT, {.i64 = B_LOWEST_NOTES}, 0, 1, FLAGS, "bass"},
+ {"lowest_notes", 0, 0, AV_OPT_TYPE_CONST, {.i64 = B_LOWEST_NOTES}, 0, 0, FLAGS, "bass"},
+ {"lower_eighth", 0, 0, AV_OPT_TYPE_CONST, {.i64 = B_LOWER_EIGHTH}, 0, 0, FLAGS, "bass"},
+ {"chords", "set chords algorithm for cellular automaton", OFFSET(ca_chords_name), AV_OPT_TYPE_INT, {.i64 = C_EIGHTH}, 0, 1, FLAGS, "chords"},
+ {"eighth", 0, 0, AV_OPT_TYPE_CONST, {.i64 = C_EIGHTH}, 0, 0, FLAGS, "chords"},
+ {"whole", 0, 0, AV_OPT_TYPE_CONST, {.i64 = C_WHOLE}, 0, 0, FLAGS, "chords"},
+ {"lead", "set lead algorithm for cellular automaton", OFFSET(ca_lead_name), AV_OPT_TYPE_INT, {.i64 = L_UPPER_EIGHTH}, 0, 0, FLAGS, "lead"},
+ {"upper_eighth", 0, 0, AV_OPT_TYPE_CONST, {.i64 = L_UPPER_EIGHTH}, 0, 0, FLAGS, "lead"},
+ {"upper_whole", 0, 0, AV_OPT_TYPE_CONST, {.i64 = L_UPPER_WHOLE}, 0, 0, FLAGS, "lead"},
+ {"lower_eighth", 0, 0, AV_OPT_TYPE_CONST, {.i64 = L_LOWER_EIGHTH}, 0, 0, FLAGS, "lead"},
+ {"lower_whole", 0, 0, AV_OPT_TYPE_CONST, {.i64 = L_LOWER_WHOLE}, 0, 0, FLAGS, "lead"},
+ {"boundary", "set boundary type for cellular automaton", OFFSET(ca_boundary), AV_OPT_TYPE_INT, {.i64 = CYCLIC}, 0, 1, FLAGS, "boundary"},
+ {"infinite", 0, 0, AV_OPT_TYPE_CONST, {.i64= INFINITE}, 0, 0, FLAGS, "boundary"},
+ {"cyclic", 0, 0, AV_OPT_TYPE_CONST, {.i64= CYCLIC}, 0, 0, FLAGS, "boundary"},
+ {"maxres", "set maximum resolution of rythm algo", OFFSET(p_maxres), AV_OPT_TYPE_INT, {.i64 = 16}, 4, 64, FLAGS, "maxres"},
+ {"density", "set density of notes in rythm algo", OFFSET(p_density), AV_OPT_TYPE_INT, {.i64 = 75}, 1, 100, FLAGS},
+ {"r_algo", "set the type for rythm algorithm", OFFSET(p_algorithm), AV_OPT_TYPE_INT, {.i64 = ALTPAD}, 0, TOGALT, FLAGS, "r_algo"},
+ {"padriddle", 0, 0, AV_OPT_TYPE_CONST, {.i64 = PADRIDDLE}, 0, 0, FLAGS, "r_algo"},
+ {"toggle", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TOGGLE}, 0, 0, FLAGS, "r_algo"},
+ {"alternate", 0, 0, AV_OPT_TYPE_CONST, {.i64 = ALTERNATE}, 0, 0, FLAGS, "r_algo"},
+ {"togpad", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TOGPAD}, 0, 0, FLAGS, "r_algo"},
+ {"altpad", 0, 0, AV_OPT_TYPE_CONST, {.i64 = ALTPAD}, 0, 0, FLAGS, "r_algo"},
+ {"togalt", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TOGALT}, 0, 0, FLAGS, "r_algo"},
+ {"algo", "set algorithm name", OFFSET(algorithm), AV_OPT_TYPE_INT, {.i64 = CA}, 0, RYTHM, FLAGS, "algo"},
+ {"riffs", 0, 0, AV_OPT_TYPE_CONST, {.i64 = RIFFS}, 0, 0, FLAGS, "algo"},
+ {"lsystem", 0, 0, AV_OPT_TYPE_CONST, {.i64 = LSYSTEM}, 0, 0, FLAGS, "algo"},
+ {"ca", 0, 0, AV_OPT_TYPE_CONST, {.i64 = CA}, 0, 0, FLAGS, "algo"},
+ {"cellular_automaton",0, 0, AV_OPT_TYPE_CONST, {.i64 = CA}, 0, 0, FLAGS, "algo"},
+ {"rythm", 0, 0, AV_OPT_TYPE_CONST, {.i64 = RYTHM}, 0, 0, FLAGS, "algo"},
+ {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(atone);
+
+static void instrument_select(int prog_no, unsigned int ticks, int channel, 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, channel, 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);
+}
+
+/*---Riffology---*/
+/*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(RIFFNL, pn, note_time, s->velocity, s);
+ note_time += pnd*note_duration;
+ schedule_noteoff(RIFFNL, pn, note_time, s);
+ s->last_note = pn;
+ }
+ pn = next;
+ pnd = 1;
+ }
+
+ if (pn != R && pn != H) {
+ schedule_noteon(RIFFNL, pn, note_time, s->velocity, s);
+ note_time += pnd * note_duration;
+ schedule_noteoff(RIFFNL, pn, note_time, s);
+ s->last_note = pn;
+ }
+
+}
+
+static int find_percussion_track(char *s)
+{
+ int i;
+
+ for (i = 0 ; i < FF_ARRAY_ELEMS(percussion_tracks) ; 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(PERCUSSION, s->track.note[i].instrument_1, note_time, s->percussion_velocity, s);
+ schedule_noteon(PERCUSSION, s->track.note[i].instrument_2, note_time, s->percussion_velocity,s);
+ schedule_noteon(PERCUSSION, 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(PERCUSSION, s->track.note[i].instrument_1, note_time, s);
+ schedule_noteoff(PERCUSSION, s->track.note[i].instrument_2, note_time, s);
+ schedule_noteoff(PERCUSSION, s->track.note[i].instrument_3, note_time, s);
+ }
+}
+
+/*Determine the pattern, tempo (to play as 8th, 16th or 32nd notes) and add the riffs to sequencer
+Reference: http://peterlangston.com/Papers/amc.pdf */
+static void schedule_riff_pattern(void *t)
+{
+ AtoneContext *s = t;
+ 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;
+}
+
+/*---Lindenmayer System---*/
+/*Schedule 0L system pattern: decode symbols as :
+F -> increase note duration by factor of 2
+X -> rest note
+p -> move up in scale by one note
+m -> move down in scale by one note
+{ -> push current state
+} -> set note state to initial value
+Reference : https://link.springer.com/chapter/10.1007%2F978-3-540-32003-6_56
+*/
+static void schedule_0L_pattern(AtoneContext *s)
+{
+ int note_state = s->height / 2, dur_state = 1, sys_state = 0, size = s->height;
+ char c;
+
+ for (int i = 0; i < s->generations; i++) {
+ int j = 0, length = 0;
+ char c;
+
+ while (s->prevgen[j] != '\0') {
+ c = s->prevgen[j];
+
+ if (length > L_MAX_LENGTH)
+ break;
+
+ if (c == s->rule1[0]) {
+ memcpy(s->nextgen + length, s->rule1 + 3, strlen(s->rule1) - 3);
+ length += strlen(s->rule1) - 3;
+ }
+
+ else if (c == s->rule2[0]) {
+ memcpy(s->nextgen + length, s->rule2 + 3, strlen(s->rule2) - 3);
+ length += strlen(s->rule2) - 3;
+ }
+
+ else {
+ memcpy(s->nextgen+length, s->prevgen+j, 1);
+ length +=1;
+ }
+ j++;
+ }
+ s->nextgen[strlen(s->nextgen)] = '\0';
+ memcpy(s->prevgen, s->nextgen, strlen(s->nextgen) + 1);
+ strcpy(s->nextgen, "");
+ }
+
+ for (int i = 0 ; i < strlen(s->prevgen) ; i++) {
+ c = s->prevgen[i];
+ switch(c) {
+ case 'F': dur_state *= 2 ;break;
+ case 'p': note_state++; if (note_state >= size) note_state -= size/2; break;
+ case 'm': note_state--; if (note_state < 0) note_state += size/2;break;
+ case 'C': s->system[sys_state].note = s->note_map[note_state];
+ s->system[sys_state].dur = dur_state; sys_state++; break;
+ case 'D': note_state = 0; dur_state = 1; break;
+ case 'X': s->system[sys_state].note = R; s->system[sys_state].dur = dur_state;
+ sys_state++; break;
+ }
+ }
+
+ s->max = sys_state;
+}
+
+static void schedule_L_pattern(void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker, sum, state;
+
+ sum = 0;
+ state = s->lstate;
+ while (sum < 8) {
+ sum += s->system[state].dur;
+ state++;
+ }
+
+ if (state < s->max)
+ for (int i = s->lstate; i < state ; i++) {
+ if (s->system[i].note == R) {
+ note_time += 4 * s->beat_dur * s->system[i].dur / 8;
+ }
+ else {
+ schedule_noteon(RIFFNL, s->system[i].note, note_time, s->velocity, s);
+ note_time += 4 * s->beat_dur*s->system[i].dur / 8;
+ schedule_noteoff(RIFFNL, s->system[i].note, note_time, s);
+ }
+
+ }
+
+ s->lstate += state;
+ play_percussion(s);
+ s->time_marker += 4*s->beat_dur;
+}
+
+/*---Cellular Automaton---*/
+static void multiple_notes(int note_time, int start, int length, int on, int *notes, AtoneContext *s)
+{
+ if (on == 1){
+ for (int i = start; i < length; i ++)
+ schedule_noteon(CA_CHORDS, notes[i], note_time, 2 * s->velocity / 3, s);
+ }
+ else {
+ for (int i = start; i < length; i ++)
+ schedule_noteoff(CA_CHORDS, notes[i], note_time, s);
+ }
+
+}
+
+static void cyclic_generate (int *curr, int *next, int *keys, int *nbor, int *ruleset, int size, int height, AVLFG *rand)
+{
+ for (int i = 0; i < 32; i++) {
+ int c = 0;
+
+ for (int j = 0; j < size; j++) {
+ c += curr[(i + nbor[j]+ 32) % 32] << j;
+ }
+ next[i] = ruleset[c];
+ }
+
+ memcpy(curr, next, 32 * sizeof(int));
+ memcpy(keys, &curr[16 - height / 2], height * sizeof(int));
+}
+
+/*Keep the ratio of 0 and 1 in cell array of cellular automaton same as in rule to simulate infinite boudary */
+static void infinite_generate (int *curr, int *next, int *keys, int *nbor, int *ruleset, int size, int height, AVLFG *rand)
+{
+ float rp = 0.0;
+
+ for (int i = 0; i < (1 << size); i++)
+ rp += ruleset[i] * 1.0 / (1 << size);
+ for (int i = 0; i < 32; i++){
+ int c = 0;
+
+ for (int j = 0; j < size; j++){
+ if ((i + nbor[j]) >= size || (i + nbor[j]) < 0){
+ float x = av_lfg_get(rand) * 0.5 / INT_MAX;
+
+ if (x > rp){
+ c += 1 << j;
+ }
+ }
+ else
+ c += curr[i + nbor[j]] << j;
+ }
+
+ next[i] = ruleset[c];
+ }
+ memcpy(curr, next, 32 * sizeof(int));
+ memcpy(keys, &curr[16 - height / 2], height * sizeof(int));
+}
+
+static void ca_bass_lowest_notes (void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker;
+
+ for (int j = 0; j < 8; j++) {
+ int i = 0;
+
+ while (i < s->height / 3) {
+ if (s->ca_8keys[j][i] == 1) {
+ s->last_bass_note = i;
+ break;
+ }
+ i++;
+ }
+ schedule_noteon (CA_BASS, s->note_map[s->last_bass_note % s->height], note_time, 3 * s->velocity / 4, s);
+ note_time += 4 * s->beat_dur / 8;
+ schedule_noteoff(CA_BASS, s->note_map[s->last_note%s->height], note_time, s);
+ }
+}
+
+/*Each note obtained is played as a 1/8 note
+Random number obtained is % (2 * i + 1) to increase bias towards upper notes*/
+static void ca_bass_lower_eighth (void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker, note;
+
+ for (int j = 0; j < 8; j++) {
+ unsigned max = 0;
+
+ for (int i = FFMAX(0, s->last_bass_note - 3); i < FFMIN(s->last_bass_note + 3, s->height / 2); i++) {
+ unsigned rand = (av_lfg_get(&s->r) * s->ca_8keys[j][i]) % (2 * i + 1);
+
+ if (max < rand) {
+ max = rand;
+ note = i;
+ }
+ }
+ if (max > 0) {
+ s->last_bass_note = note;
+ schedule_noteon (CA_BASS, s->note_map[s->last_bass_note % s->height], note_time, 2 * s->velocity / 3, s);
+ note_time += 4 * s->beat_dur / 8;
+ schedule_noteoff(CA_BASS, s->note_map[s->last_note%s->height], note_time, s);
+ }
+ }
+}
+
+static void ca_chords_eighth (void *t)
+{
+ enum {ON, OFF};
+ AtoneContext *s = t;
+ int note_time = s->time_marker, note, notes[3];
+
+ for (int j = 0; j < 8; j++) {
+ unsigned max = 0;
+
+ for (int i = 0; i < s->height; i++) {
+ unsigned rand = (av_lfg_get(&s->r) * s->ca_8keys[j][i]) % (2 * i + 1);
+
+ if ((s->ca_8keys[j][i] % s->height) == 1 && (s->ca_8keys[j][i + 2] % s->height) == 1 && (s->ca_8keys[j][i + 4] % s->height) == 1) {
+ if (max < rand) {
+ max = rand;
+ note = i;
+ }
+ }
+ }
+ if (max > 0) {
+ s->last_note = note;
+ for (int i = 0; i < 3; i++)
+ notes[i] = s->note_map[(s->last_note + 2 * i) % s->height];
+ multiple_notes (note_time, 0, 3, ON, notes, s);
+ note_time += 4 * s->beat_dur / 8;
+ multiple_notes (note_time, 0, 3, OFF, notes, s);
+ }
+ }
+}
+
+static void ca_chords_whole (void *t)
+{
+ enum {ON, OFF};
+ AtoneContext *s = t;
+ int note_time = s->time_marker, note[8], notes[3], k;
+
+ for (int j = 0; j < 8; j++) {
+ unsigned max = 0;
+
+ note[j] = 0;
+ for (int i = 0; i < s->height; i++) {
+ unsigned rand = (av_lfg_get(&s->r) * s->ca_8keys[j][i]) % (2 * i + 1);
+
+ if ((s->ca_8keys[j][i] % s->height) == 1 && (s->ca_8keys[j][i + 2] % s->height) == 1 && (s->ca_8keys[j][i + 4] % s->height) == 1) {
+ if (max < rand) {
+ max = rand;
+ k = i;
+ }
+ }
+ }
+ if (max > 0)
+ note[j] = k;
+ }
+ k = 0;
+ while (k < 8) {
+ int j = 0;
+ if (note[k] > 0) {
+ s->last_note = note[k];
+ for (int i = 0; i < 3; i++)
+ notes[i] = s->note_map[(s->last_note + 2 * i) % s->height];
+ multiple_notes (note_time, 0, 3, ON, notes, s);
+ note_time += 4 * s->beat_dur / 8;
+ while ( k + j < 8) {
+ if (note[k+j] > 0 && note[k + j] == note[k]) {
+ note_time += 4 * s->beat_dur/8;
+ j++;
+ }
+ else
+ break;
+ }
+ multiple_notes (note_time, 0, 3, OFF, notes, s);
+ }
+ k += j + 1;
+ }
+}
+
+static void ca_lead_upper_whole (void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker, note[8], k;
+
+ for (int j = 0; j < 8; j++) {
+ unsigned max = 0;
+
+ note[j] = 0;
+ for (int i = FFMAX(s->last_lead_note - 3, s->height/3); i < FFMIN(s->last_lead_note + 3, s->height); i++) {
+ unsigned rand = (av_lfg_get(&s->r) * s->ca_8keys[j][i]) % (5 * i + 1);
+
+ if (max < rand) {
+ max = rand;
+ k = i;
+ }
+ }
+ if (max > 0)
+ note[j] = k;
+ }
+ k = 0;
+ while(k < 8){
+ int j = 0;
+ if (note[k] > 0) {
+ s->last_lead_note = note[k];
+ schedule_noteon (CA_LEAD, s->note_map[s->last_lead_note % s->height], note_time, s->velocity, s);
+ note_time += 4 * s->beat_dur / 8;
+ while ( k + j < 8) {
+ if (note[k+j] > 0 && note[k + j] == note[k]) {
+ note_time += 4 * s->beat_dur / 8;
+ j++;
+ }
+ else
+ break;
+ }
+ schedule_noteoff(CA_LEAD, s->note_map[s->last_lead_note % s->height], note_time, s);
+ }
+ k += j+1;
+ }
+}
+
+static void ca_lead_lower_whole (void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker, note[8], k;
+
+ for (int j = 0; j < 8; j++) {
+ unsigned max = 0;
+
+ note[j] = 0;
+ for (int i = FFMAX(s->last_lead_note - 3, s->height/3); i < FFMIN(s->last_lead_note + 3, s->height); i++) {
+ unsigned rand = (av_lfg_get(&s->r) * s->ca_8keys[j][i]) % (5 * FFABS(s->height - i) + 1);
+
+ if (max < rand) {
+ max = rand;
+ k = i;
+ }
+ }
+ if (max > 0)
+ note[j] = k;
+ }
+ k = 0;
+ while(k < 8){
+ int j = 0;
+ if (note[k] > 0) {
+ s->last_lead_note = note[k];
+ schedule_noteon (CA_LEAD, s->note_map[s->last_lead_note % s->height], note_time, s->velocity, s);
+ note_time += 4 * s->beat_dur / 8;
+ while ( k + j < 8) {
+ if (note[k+j] > 0 && note[k + j] == note[k]) {
+ note_time += 4 * s->beat_dur / 8;
+ j++;
+ }
+ else
+ break;
+ }
+ schedule_noteoff(CA_LEAD, s->note_map[s->last_lead_note % s->height], note_time, s);
+ }
+ k += j + 1;
+ }
+}
+
+static void ca_lead_upper_eighth (void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker, note;
+
+ for (int j = 0; j < 8; j++) {
+ unsigned max = 0;
+
+ for (int i = FFMAX(s->last_lead_note - 3, s->height/3); i < FFMIN(s->last_lead_note + 3, s->height); i++) {
+ unsigned rand = (av_lfg_get(&s->r) * s->ca_8keys[j][i]) % (5 * i + 1);
+
+ if (max < rand) {
+ max = rand;
+ note = i;
+ }
+ }
+ if (max > 0) {
+ s->last_lead_note = note;
+ schedule_noteon (CA_LEAD, s->note_map[s->last_lead_note % s->height], note_time, s->velocity, s);
+ note_time += 4 * s->beat_dur / 8;
+ schedule_noteoff(CA_LEAD, s->note_map[s->last_lead_note % s->height], note_time, s);
+ }
+ }
+}
+
+static void ca_lead_lower_eighth (void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker, note;
+
+
+ for (int j = 0; j < 8; j++) {
+ unsigned max = 0;
+
+ for (int i = FFMAX(s->last_lead_note - 3, s->height / 3); i < FFMIN(s->last_lead_note + 3, s->height); i++) {
+ unsigned rand = (av_lfg_get(&s->r) * s->ca_8keys[j][i]) % (5 * FFABS(s->height - i) + 1);
+
+ if (max < rand) {
+ max = rand;
+ note = i;
+ }
+ }
+ if (max > 0) {
+ s->last_lead_note = note;
+ schedule_noteon (CA_LEAD, s->note_map[s->last_lead_note % s->height], note_time, s->velocity, s);
+ note_time += 4 * s->beat_dur / 8;
+ schedule_noteoff(CA_LEAD, s->note_map[s->last_lead_note%s->height], note_time, s);
+ }
+ }
+
+}
+
+static void schedule_ca_pattern(void *t)
+{
+ AtoneContext *s = t;
+
+ for (int i = 0; i < 8; i++)
+ s->ca_generate(s->ca_cells, s->ca_nextgen, s->ca_8keys[i], s->ca_neighbours, s->ca_ruleset, s->ca_nsize, s->height, &s->r);
+ s->ca_bass(s);
+ s->ca_chords(s);
+ s->ca_lead(s);
+ play_percussion(s);
+ s->time_marker += 4 * s->beat_dur;
+
+}
+
+/*---Rythm---*/
+/*Stochastically subdivide and set value to 1*/
+static void divvy(int lo, int hi, AtoneContext *s)
+{
+ int mid;
+ unsigned rand = av_lfg_get(&s->r);
+
+ mid = (lo + hi) >> 1;
+ s->p_instr[lo] = 1;
+ if (rand % 101 < s->p_density && hi - lo > 1) {
+ divvy(lo, mid, s);
+ divvy(mid, hi, s);
+ }
+}
+
+static int get_p_instr(AtoneContext *s)
+{
+ int instr = rand() % 4;
+
+ switch (instr) {
+ case 0: instr = drums[av_lfg_get(&s->r) % FF_ARRAY_ELEMS(drums)];break;
+ case 1: instr = toms[av_lfg_get(&s->r) % FF_ARRAY_ELEMS(toms)];break;
+ case 2: instr = cymbals[av_lfg_get(&s->r) % FF_ARRAY_ELEMS(cymbals)];break;
+ case 3: instr = hi_hats[av_lfg_get(&s->r) % FF_ARRAY_ELEMS(hi_hats)];break;
+ }
+ return instr;
+}
+
+/*Reference taken from :
+http://cgm.cs.mcgill.ca/~godfried/publications/Hawaii-Paper-Rhythm-Generation.pdf
+Reflect the first half of the pattern in second half*/
+static void padriddle(AtoneContext *s)
+{
+ divvy(0, s->p_maxres, s);
+ for (int i = 0; i < s->p_maxres / 2; i++) {
+ s->p_instr[i] = get_p_instr(s) * s->p_instr[i];
+ s->p_instr[s->p_maxres / 2 + i] = s->p_instr[i];
+ s->p_beats[i] = s->p_maxres;
+ s->p_beats[s->p_maxres / 2 + i] = s->p_maxres;
+ }
+}
+
+/*This will give beats of the type [xxx.] or [xxxxxxx.]*/
+static void alternate(AtoneContext *s)
+{
+ int i, rep_size, newsize, rep_array[] = {4, 8, 16, 32};
+
+ for (i = 0; i < 4; i++) {
+ if (s->p_maxres < rep_array[i])
+ break;
+ }
+
+ rep_size = rep_array[av_lfg_get(&s->r) % i];
+ newsize = s->p_maxres - s->p_maxres / rep_size;
+ divvy(0, newsize, s);
+ for (int i = 0; i < newsize; i++) {
+ s->p_instr[i] = s->p_instr[i] * get_p_instr(s);
+ if ((i + 1) % (rep_size - 1) == 0)
+ s->p_beats[i] = s->p_maxres / 2;
+ else
+ s->p_beats[i] = s->p_maxres;
+ }
+
+ s->p_maxres = newsize;
+}
+
+/*Toggle between the instruments in the first half and second half*/
+static void toggle(AtoneContext *s)
+{
+ int instr1 = get_p_instr(s), instr2 = get_p_instr(s);
+ divvy(0, s->p_maxres/2, s);
+ for (int i = 0; i < s->p_maxres / 2; i++) {
+ s->p_instr[i] = instr1 * s->p_instr[i];
+ s->p_instr[s->p_maxres / 2 + i] = instr2 * s->p_instr[i] / instr1;
+ s->p_beats[i] = s->p_maxres;
+ s->p_beats[s->p_maxres / 2 + i] = s->p_maxres;
+ }
+}
+
+static void alternate_n_padriddle(AtoneContext *s)
+{
+ alternate(s);
+ for (int i = 0; i < s->p_maxres / 2; i++) {
+ s->p_instr[s->p_maxres / 2 + i] = s->p_instr[i];
+ }
+}
+
+static void toggle_n_padriddle(AtoneContext *s)
+{
+ s->p_maxres = s->p_maxres / 2;
+ toggle(s);
+ s->p_maxres = s->p_maxres * 2;
+ for (int i = 0; i < s->p_maxres / 2; i++) {
+ s->p_instr[s->p_maxres / 2 + i] = s->p_instr[i];
+ s->p_beats[s->p_maxres / 2 + i] = s->p_beats[i];
+ }
+}
+
+static void alternate_n_toggle(AtoneContext *s)
+{
+ int instr1 = get_p_instr(s), instr2 = get_p_instr(s);
+
+ alternate(s);
+ for (int i = 0; i < s->p_maxres / 2; i++) {
+ s->p_instr[i] = instr1 * FFMIN(1, s->p_instr[i]);
+ s->p_instr[s->p_maxres / 2 + i] = instr2 * FFMIN(1, s->p_instr[s->p_maxres / 2 + i]);
+ }
+}
+
+static void schedule_r_pattern(void *t)
+{
+ AtoneContext *s = t;
+ int note_time = s->time_marker;
+
+ for (int i = 0; i < s->p_maxres; i++) {
+ schedule_noteon(PERCUSSION, s->p_instr[i], note_time, s->percussion_velocity, s);
+ note_time += 4 * s->beat_dur / s->p_beats[i];
+ schedule_noteoff(PERCUSSION, s->p_instr[i], note_time, 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)
+{
+ AtoneContext *s = data;
+
+ schedule_timer_event(data);
+ s->schedule_pattern(data);
+}
+
+static int get_scale (AtoneContext *s)
+{
+ int s_size, x[7];
+
+ switch (s->scale_name[0]) {
+ case 'C': x[0] = C3; break;
+ case 'D': x[0] = D3; break;
+ case 'E': x[0] = E3; break;
+ case 'F': x[0] = F3; break;
+ case 'G': x[0] = G3; break;
+ case 'A': x[0] = A3; break;
+ case 'B': x[0] = B3; break;
+ default: x[0] = C3; break;
+ }
+
+ switch (s->scale_name[1]) {
+ case 'b': x[0] -= 1; break;
+ case 's': x[0] += 1; break;
+ }
+
+ if (strcmp(s->scale_name+2, "major") == 0 || strcmp(s->scale_name+3, "major") == 0) {
+ for (int i = 0; i < FF_ARRAY_ELEMS(major_increment); i++)
+ x[i + 1] = x[i] + major_increment[i];
+ s_size = 7;
+ }
+ else if (strcmp(s->scale_name+2, "n_minor") == 0 || strcmp(s->scale_name+3, "n_minor") == 0) {
+ for (int i = 0; i < FF_ARRAY_ELEMS(natural_minor_increment); i++)
+ x[i + 1] = x[i] + natural_minor_increment[i];
+ s_size = 7;
+ }
+ else if (strcmp(s->scale_name+2, "m_minor") == 0 || strcmp(s->scale_name+3, "m_minor") == 0) {
+ for (int i = 0; i < FF_ARRAY_ELEMS(melodic_minor_increment); i++)
+ x[i + 1] = x[i] + melodic_minor_increment[i];
+ s_size = 7;
+ }
+ else if (strcmp(s->scale_name+2, "h_minor") == 0 || strcmp(s->scale_name+3, "h_minor") == 0) {
+ for (int i = 0; i < FF_ARRAY_ELEMS(harmonic_minor_increment); i++)
+ x[i + 1] = x[i] + harmonic_minor_increment[i];
+ s_size = 7;
+ }
+ else if (strcmp(s->scale_name+2, "p_major") == 0 || strcmp(s->scale_name+3, "p_major") == 0) {
+ for (int i = 0; i < FF_ARRAY_ELEMS(major_pentatonic_increment); i++)
+ x[i + 1] = x[i] + major_pentatonic_increment[i];
+ s_size = 5;
+ }
+ else if (strcmp(s->scale_name+2, "p_minor") == 0 || strcmp(s->scale_name+3, "p_minor") == 0) {
+ for (int i = 0; i < FF_ARRAY_ELEMS(minor_pentatonic_increment); i++)
+ x[i + 1] = x[i] + minor_pentatonic_increment[i];
+ s_size = 5;
+ }
+ else if (strcmp(s->scale_name+2, "blues") == 0 || strcmp(s->scale_name+3, "blues") == 0) {
+ for (int i = 0; i < FF_ARRAY_ELEMS(blues_increment); i++)
+ x[i + 1] = x[i] + blues_increment[i];
+ s_size = 6;
+ }
+ else {
+ av_log(s, AV_LOG_WARNING, "scale %s not found! defaulting to a major scale\n", s->scale_name);
+ for (int i = 0; i < FF_ARRAY_ELEMS(major_increment); i++)
+ s->scale[i + 1] = s->scale[i] + major_increment[i];
+ s_size = 7;
+ }
+
+ s->scale = av_malloc(s_size * sizeof(int));
+ memcpy(s->scale, x, s_size * sizeof(int));
+
+ return s_size;
+}
+
+static int find_instrument(char *instrument, AtoneContext *s)
+{
+ for (int i = 0; i < FF_ARRAY_ELEMS(GM_instrument_list); i++)
+ if (strcmp(GM_instrument_list[i], instrument) == 0)
+ return i;
+
+ av_log(s, AV_LOG_WARNING, "instrument %s "
+ "not found! defaulting to Acoustic-Grand\n", instrument);
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ AtoneContext *s = ctx->priv;
+ int sfont_id, copy, i = 1, j = 1, s_size;
+
+ /*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->prevgen = av_malloc(sizeof(char) * L_MAX_LENGTH);
+ s->nextgen = av_malloc(sizeof(char) * L_MAX_LENGTH);
+ s->system = av_malloc(sizeof(lsys) * L_MAX_LENGTH);
+ strcpy(s->prevgen, s->axiom);
+
+ 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->lstate = 0;
+ s->max = 0;
+ s->last_note = 0;
+ s->last_bass_note = 0;
+ s->last_lead_note = s->height / 2;
+ 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->ca_nsize = 0;
+ copy = s->ca_ruletype;
+ while (copy > 0) {
+ if (copy % 2 == 1)
+ s->ca_nsize++;
+ copy = copy >> 1;
+ }
+ s->ca_neighbours = av_malloc(sizeof(int) * s->ca_nsize);
+ s->ca_ruleset = av_malloc(sizeof(int) * (1 << s->ca_nsize));
+ for (int k = 0; k < 8; k++)
+ s->ca_8keys[k] = av_malloc(s->height * sizeof(int));
+ s->note_map = av_malloc(sizeof(int) * s->height);
+ s_size = get_scale(s);
+ copy = s->ca_ruletype;
+ /*The neighbouring cells on which cells of next generation is determined as
+ in http://tones.wolfram.com/about/how-it-works*/
+ while (copy > 0) {
+ if (copy % 2 == 1){
+ if (i % 2 == 0)
+ s->ca_neighbours[(s->ca_nsize - 1) / 2 + j / 2] = -1 * (i/2);
+ else
+ s->ca_neighbours[(s->ca_nsize - 1) / 2 - j / 2] = (i/2);
+ j++;
+ }
+ copy = copy >> 1;
+ i++;
+ }
+ copy = s->ca_rule;
+ i = 0;
+ while (i != (1 << s->ca_nsize)) {
+ s->ca_ruleset[i++] = copy % 2;
+ copy = copy >> 1;
+ }
+
+ /*In cellular automaton, the middle portion(s->height) is mapped to a scale
+ The lower and upper octaves are mapped by subtracting and adding 12 respectively*/
+ j = s_size/2 - (s->height+1)/4;
+ for (i = 0; i < s->height; i++) {
+ if (j < 0)
+ s->note_map[i] = s->scale[s_size + j % s_size] - 12 * (int)((j * -1.0) / s_size + 1) ;
+ else
+ s->note_map[i] = s->scale[j % s_size] + 12 * (int)((j * 1.0) / s_size);
+ j++;
+ }
+ for (i = 0; i < 32; i++)
+ s->ca_cells[i] = av_lfg_get(&s->r) % 2;
+
+ switch (s->ca_boundary) {
+ case INFINITE: s->ca_generate = infinite_generate; break;
+ case CYCLIC: s->ca_generate = cyclic_generate; break;
+ }
+
+ switch (s->ca_bass_name) {
+ case B_LOWEST_NOTES: s->ca_bass = ca_bass_lowest_notes; break;
+ case B_LOWER_EIGHTH: s->ca_bass = ca_bass_lower_eighth; break;
+ }
+
+ switch (s->ca_chords_name) {
+ case C_EIGHTH: s->ca_chords = ca_chords_eighth; break;
+ case C_WHOLE: s->ca_chords = ca_chords_whole; break;
+ }
+
+ switch (s->ca_lead_name) {
+ case L_UPPER_EIGHTH: s->ca_lead = ca_lead_upper_eighth; break;
+ case L_UPPER_WHOLE: s->ca_lead = ca_lead_upper_whole; break;
+ case L_LOWER_EIGHTH: s->ca_lead = ca_lead_lower_eighth; break;
+ case L_LOWER_WHOLE: s->ca_lead = ca_lead_lower_whole; break;
+ }
+
+ s->p_instr = av_malloc(s->p_maxres * sizeof(int));
+ s->p_beats = av_malloc(s->p_maxres * sizeof(int));
+ memset(s->p_instr, 0, s->p_maxres * sizeof(int));
+ memset(s->p_beats, 0, s->p_maxres * sizeof(int));
+
+ switch (s->p_algorithm) {
+ case PADRIDDLE: padriddle(s); break;
+ case ALTERNATE: alternate(s); break;
+ case TOGGLE: toggle(s); break;
+ case ALTPAD: alternate_n_padriddle(s); break;
+ case TOGPAD: toggle_n_padriddle(s); break;
+ case TOGALT: alternate_n_toggle(s); break;
+ }
+
+ switch (s->algorithm) {
+ case RIFFS: s->schedule_pattern = schedule_riff_pattern; break;
+ case LSYSTEM: schedule_0L_pattern(s); s->schedule_pattern = schedule_L_pattern; break;
+ case CA: s->schedule_pattern = schedule_ca_pattern; break;
+ case RYTHM: s->schedule_pattern = schedule_r_pattern; break;
+ }
+
+ s->i = find_percussion_track(s->track_name);
+ instrument_select(find_instrument(s->instrument, s), s->time_marker, RIFFNL, s);
+ instrument_select(find_instrument(s->bass_instr, s), s->time_marker, CA_BASS, s);
+ instrument_select(find_instrument(s->chords_instr, s), s->time_marker, CA_CHORDS, s);
+ instrument_select(find_instrument(s->lead_instr, s), s->time_marker, CA_LEAD, 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);
+ av_freep(&s->prevgen);
+ av_freep(&s->nextgen);
+ av_freep(&s->system);
+ av_freep(&s->ca_ruleset);
+ av_freep(&s->ca_neighbours);
+ for (int k = 0; k < 8; k++)
+ av_freep(&s->ca_8keys[k]);
+ av_freep(&s->note_map);
+ av_freep(&s->scale);
+ av_freep(&s->p_instr);
+ av_freep(&s->p_beats);
+}
+
+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 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) {
+ s->schedule_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 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..711f187290
--- /dev/null
+++ b/libavfilter/notedef.h
@@ -0,0 +1,278 @@
+/*
+ * 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
+Reference: 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 65536
+
+/*Define Scale Intervals*/
+const int major_increment[] = {2, 2, 1, 2, 2, 2};
+const int natural_minor_increment[] = {2, 1, 2, 2, 1, 2};
+const int melodic_minor_increment[] = {2, 1, 2, 2, 2, 2};
+const int harmonic_minor_increment[] = {2, 1, 2, 2, 1, 3};
+const int major_pentatonic_increment[] = {2, 2, 3, 2};
+const int minor_pentatonic_increment[] = {3, 2, 2, 3};
+const int blues_increment[] = {3, 2, 1, 1, 3};
+
+const int drums[] = {Bass_Drum_1, Acoustic_Bass_Drum, Acoustic_Snare, Electric_Snare};
+const int toms[] = {Low_Floor_Tom, Low_Mid_Tom, Low_Tom, Hi_Mid_Tom, High_Floor_Tom, High_Tom};
+const int cymbals[] = {Crash_Cymbal_1, Crash_Cymbal_2, Ride_Cymbal_1, Ride_Cymbal_2, Chinese_Cymbal, Splash_Cymbal};
+const int hi_hats[] = {Pedal_Hi_Hat, Closed_Hi_Hat, Open_Hi_Hat};
+
+#endif/*AVFILTER_NOTEDEF_H*/
+
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 308fbe07c3..b8ba489da7 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 87
+#define LIBAVFILTER_VERSION_MINOR 88
#define LIBAVFILTER_VERSION_MICRO 100
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