This patch is part of the qualification task for Audio Tones Source Filter.
---
Changelog | 1 +
configure | 4 +
doc/filters.texi | 26 +++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/asrc_fluidsynth.c | 177 ++++++++++++++++++++++++++++++++++
libavfilter/version.h | 2 +-
7 files changed, 211 insertions(+), 1 deletion(-)
create mode 100644 libavfilter/asrc_fluidsynth.c
diff --git a/Changelog b/Changelog
index db2ca92e8a..2a22599969 100644
--- a/Changelog
+++ b/Changelog
@@ -46,6 +46,7 @@ version <next>:
- High Voltage Software ADPCM decoder
- LEGO Racers ALP (.tun & .pcm) demuxer
- AMQP 0-9-1 protocol (RabbitMQ)
+- fluidsynth filter
version 4.2:
diff --git a/configure b/configure
index 8b17134944..b22a09fac1 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 fluidsynth support via libfluidsynth [no]
--enable-libfontconfig enable libfontconfig, useful for drawtext filter
[no]
--enable-libfreetype enable libfreetype, needed for drawtext filter [no]
--enable-libfribidi enable libfribidi, improves drawtext filter [no]
@@ -1770,6 +1771,7 @@ EXTERNAL_LIBRARY_LIST="
libdc1394
libdrm
libflite
+ libfluidsynth
libfontconfig
libfreetype
libfribidi
@@ -3509,6 +3511,7 @@ find_rect_filter_deps="avcodec avformat gpl"
firequalizer_filter_deps="avcodec"
firequalizer_filter_select="rdft"
flite_filter_deps="libflite"
+fluidsynth_filter_deps="libfluidsynth"
framerate_filter_select="scene_sad"
freezedetect_filter_select="scene_sad"
frei0r_filter_deps="frei0r libdl"
@@ -6269,6 +6272,7 @@ 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
$flite_extralibs
+enabled libfluidsynth && require_pkg_config libfluidsynth fluidsynth
"fluidsynth.h" fluid_log
enabled fontconfig && enable libfontconfig
enabled libfontconfig && require_pkg_config libfontconfig fontconfig
"fontconfig/fontconfig.h" FcInit
enabled libfreetype && require_pkg_config libfreetype freetype2
"ft2build.h FT_FREETYPE_H" FT_Init_FreeType
diff --git a/doc/filters.texi b/doc/filters.texi
index ff008b119f..cdf96d1ba1 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6010,6 +6010,32 @@ ffplay -f lavfi flite=text='No more be grieved for which
that thou hast done.'
For more information about libflite, check:
@url{http://www.festvox.org/flite/}
+@section fluidsynth
+
+Synthesize random notes using libfluidsynth library.
+
+To compile this filter you need to configure FFmpeg with
+@code{--enable-libfluidsynth}.
+
+The filter accepts the following options:
+
+@table @option
+@item sample_rate, r
+Set the sample rate of the synthesizer. Default value is 44100.
+
+@item nb_samples, n
+Set the number of samples per frame. Default value is 1024.
+
+@item duration, d
+Set the duration of sound generation. Default value is 10 sec.
+
+@item soundfont
+Enter the location of the soundfont. Without loading the soundfont fluidsynth
won't be able to synthesize.
+
+@item chan
+Set the MIDI channel. Default value is 0.
+@end table
+
@section anoisesrc
Generate a noise audio signal.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 750412da6b..626d7c0f09 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -148,6 +148,7 @@ OBJS-$(CONFIG_AFIRSRC_FILTER) +=
asrc_afirsrc.o
OBJS-$(CONFIG_ANOISESRC_FILTER) += asrc_anoisesrc.o
OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
OBJS-$(CONFIG_FLITE_FILTER) += asrc_flite.o
+OBJS-$(CONFIG_FLUIDSYNTH_FILTER) += asrc_fluidsynth.o
OBJS-$(CONFIG_HILBERT_FILTER) += asrc_hilbert.o
OBJS-$(CONFIG_SINC_FILTER) += asrc_sinc.o
OBJS-$(CONFIG_SINE_FILTER) += asrc_sine.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 501e5d041b..a1e812093c 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -142,6 +142,7 @@ extern AVFilter ff_asrc_afirsrc;
extern AVFilter ff_asrc_anoisesrc;
extern AVFilter ff_asrc_anullsrc;
extern AVFilter ff_asrc_flite;
+extern AVFilter ff_asrc_fluidsynth;
extern AVFilter ff_asrc_hilbert;
extern AVFilter ff_asrc_sinc;
extern AVFilter ff_asrc_sine;
diff --git a/libavfilter/asrc_fluidsynth.c b/libavfilter/asrc_fluidsynth.c
new file mode 100644
index 0000000000..be98815c56
--- /dev/null
+++ b/libavfilter/asrc_fluidsynth.c
@@ -0,0 +1,177 @@
+/*
+ * 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 <fluidsynth.h>
+#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
+#include "libavutil/lfg.h"
+#include "libavutil/random_seed.h"
+#include "avfilter.h"
+#include "audio.h"
+#include "formats.h"
+#include "internal.h"
+
+typedef struct FluidSynthContext {
+ const AVClass *class;
+ fluid_settings_t *settings;
+ fluid_synth_t *synth;
+ int soundfont_id;
+ int nb_samples;
+ int sample_rate;
+ int chan;
+ char *soundfont;
+ int64_t pts;
+ int64_t duration;
+ AVLFG c;
+} FluidSynthContext;
+
+#define OFFSET(x) offsetof(FluidSynthContext, x)
+#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption fluidsynth_options[] = {
+ {"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},
+ {"nb_samples", "set number of samples per requested frame",
OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1,
INT64_MAX, FLAGS},
+ {"n", "set number of samples per requested frame",
OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1,
INT64_MAX, FLAGS},
+ {"duration", "set duration",
OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=10000000}, 0,
INT64_MAX, FLAGS},
+ {"d", "set duration",
OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=10000000}, 0,
INT64_MAX, FLAGS},
+ {"soundfont", "location of soundfont",
OFFSET(soundfont), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX,
FLAGS},
+ {"chan", "set MIDI channel", OFFSET(chan),
AV_OPT_TYPE_INT, {.str=0}, 0, 15, FLAGS},
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(fluidsynth);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ FluidSynthContext *fluidsynth = ctx->priv;
+ fluidsynth->soundfont_id = -1;
+ /// Initialize the fluidsynth setting
+ fluidsynth->settings = new_fluid_settings();
+ if(fluidsynth->settings == NULL) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to create fluidsynth settings\n");
+ return AVERROR_UNKNOWN;
+ }
+ /// Initialize the synthesizer
+ fluidsynth->synth = new_fluid_synth(fluidsynth->settings);
+ if(fluidsynth->synth == NULL) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to create fluidsynth synthesizer\n");
+ return AVERROR_UNKNOWN;
+ }
+
+ fluidsynth->soundfont_id = fluid_synth_sfload(fluidsynth->synth,
fluidsynth->soundfont, 1);
+ if(fluidsynth->soundfont_id < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to load soundfont\n");
+ }
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ FluidSynthContext *fluidsynth = ctx->priv;
+
+ delete_fluid_synth(fluidsynth->synth);
+ delete_fluid_settings(fluidsynth->settings);
+
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ FluidSynthContext *fluidsynth = ctx->priv;
+
+ AVFilterChannelLayouts *chanlayout = NULL;
+ int64_t chanlayouts =
av_get_default_channel_layout(2*fluid_synth_count_audio_channels(fluidsynth->synth));
+
+ AVFilterFormats *formats = NULL;
+ AVFilterFormats *sample_rate = NULL;
+ int ret;
+
+ if ((ret = ff_add_format (&formats , AV_SAMPLE_FMT_FLT
)) < 0 ||
+ (ret = ff_set_common_formats (ctx , formats
)) < 0 ||
+ (ret = ff_add_channel_layout (&chanlayout , chanlayouts
)) < 0 ||
+ (ret = ff_set_common_channel_layouts (ctx , chanlayout
)) < 0 ||
+ (ret = ff_add_format (&sample_rate,
fluidsynth->sample_rate)) < 0 ||
+ (ret = ff_set_common_samplerates (ctx , sample_rate
)) < 0)
+ return ret;
+ return 0;
+}
+
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ FluidSynthContext *fluidsynth = ctx->priv;
+
+ av_lfg_init(&fluidsynth->c, av_get_random_seed());
+
+ outlink->sample_rate = fluidsynth->sample_rate;
+ fluidsynth->duration = av_rescale(fluidsynth->duration,
fluidsynth->sample_rate, AV_TIME_BASE);
+
+ return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFrame *frame;
+ FluidSynthContext *fluidsynth = outlink->src->priv;
+ int nb_samples, key;
+
+ if (fluidsynth->duration) {
+ nb_samples = FFMIN(fluidsynth->nb_samples, fluidsynth->duration -
fluidsynth->pts);
+ av_assert1(nb_samples >= 0);
+ if (!nb_samples)
+ return AVERROR_EOF;
+ }
+
+ if(!(frame = ff_get_audio_buffer(outlink, nb_samples)))
+ return AVERROR(ENOMEM);
+
+ key = av_lfg_get(&fluidsynth->c) % 128 ;
+
+ fluid_synth_noteon(fluidsynth->synth, fluidsynth->chan, key, 100);
+ fluid_synth_write_float(fluidsynth->synth, nb_samples, frame->data[0], 0,
2, frame->data[0], 1, 2);
+ fluid_synth_noteoff(fluidsynth->synth, fluidsynth->chan, key);
+
+ frame->pts = fluidsynth->pts;
+ fluidsynth->pts += nb_samples;
+
+ return ff_filter_frame(outlink, frame);
+}
+
+static const AVFilterPad fluidsynth_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .request_frame = request_frame,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_asrc_fluidsynth = {
+ .name = "fluidsynth",
+ .description = NULL_IF_CONFIG_SMALL("Synthesize tones using
libfluidsynth."),
+ .query_formats = query_formats,
+ .init = init,
+ .uninit = uninit,
+ .priv_size = sizeof(FluidSynthContext),
+ .inputs = NULL,
+ .outputs = fluidsynth_outputs,
+ .priv_class = &fluidsynth_class,
+};
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 7b41018be7..4c4e8afe2d 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
-#define LIBAVFILTER_VERSION_MINOR 77
+#define LIBAVFILTER_VERSION_MINOR 78
#define LIBAVFILTER_VERSION_MICRO 100
--
2.25.0
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