@@ -20,6 +20,7 @@ version <next>:

 - OpenCL overlay filter

 - video mix filter

 - video normalize filter

+- audio lv2 wrapper filter

 version 3.4:

@@ -283,6 +283,7 @@ External library support:

   --enable-libzimg         enable z.lib, needed for zscale filter [no]

   --enable-libzmq          enable message passing via libzmq [no]

   --enable-libzvbi         enable teletext support via libzvbi [no]

+  --enable-lv2             enable LV2 audio filtering [no]

   --disable-lzma           disable lzma [autodetect]

   --enable-decklink        enable Blackmagic DeckLink I/O support [no]

   --enable-libndi_newtek   enable Newteck NDI I/O support [no]

@@ -1631,6 +1632,7 @@ EXTERNAL_LIBRARY_LIST="

     libzimg

     libzmq

     libzvbi

+    lv2

     mediacodec

     openal

     opengl

@@ -3229,6 +3231,7 @@ hqdn3d_filter_deps="gpl"

 interlace_filter_deps="gpl"

 kerndeint_filter_deps="gpl"

 ladspa_filter_deps="ladspa libdl"

+lv2_filter_deps="lv2"

 mcdeint_filter_deps="avcodec gpl"

 movie_filter_deps="avcodec avformat"

 mpdecimate_filter_deps="gpl"

@@ -5825,6 +5828,7 @@ enabled gmp               && require gmp gmp.h mpz_export -lgmp

 enabled gnutls            && require_pkg_config gnutls gnutls gnutls/gnutls.h gnutls_global_init

 enabled jni               && { [ $target_os = "android" ] && check_header jni.h && enabled pthreads || die "ERROR: jni not found"; }

 enabled ladspa            && require_header ladspa.h

+enabled lv2               && require_pkg_config lv2 lilv-0 "lilv-0/lilv/lilv.h" lilv_world_new

 enabled libiec61883       && require libiec61883 libiec61883/iec61883.h iec61883_cmp_connect -lraw1394 -lavc1394 -lrom1394 -liec61883

 enabled libass            && require_pkg_config libass libass ass/ass.h ass_library_init

 enabled libbluray         && require_pkg_config libbluray libbluray libbluray/bluray.h bd_open

@@ -3281,6 +3281,65 @@ lowpass=c=LFE

 @end example

 @end itemize

+@section lv2

+

+Load a LV2 (LADSPA Version 2) plugin.

+

+To enable compilation of this filter you need to configure FFmpeg with

+@code{--enable-lv2}.

+

+@table @option

+@item plugin, p

+Specifies the plugin URI. You may need to escape ':'.

+

+@item controls, c

+Set the '|' separated list of controls which are zero or more floating point

+values that determine the behavior of the loaded plugin (for example delay,

+threshold or gain).

+If @option{controls} is set to @code{help}, all available controls and

+their valid ranges are printed.

+

+@item sample_rate, s

+Specify the sample rate, default to 44100. Only used if plugin have

+zero inputs.

+

+@item nb_samples, n

+Set the number of samples per channel per each output frame, default

+is 1024. Only used if plugin have zero inputs.

+

+@item duration, d

+Set the minimum duration of the sourced audio. See

+@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}

+for the accepted syntax.

+Note that the resulting duration may be greater than the specified duration,

+as the generated audio is always cut at the end of a complete frame.

+If not specified, or the expressed duration is negative, the audio is

+supposed to be generated forever.

+Only used if plugin have zero inputs.

+@end table

+

+@subsection Examples

+

+@itemize

+@item

+Apply bass enhancer plugin from Calf:

+@example

+lv2=p=http\\\\://calf.sourceforge.net/plugins/BassEnhancer:c=amount=2

+@end example

+

+@item

+Apply bass vinyl plugin from Calf:

+@example

+lv2=p=http\\\\://calf.sourceforge.net/plugins/Vinyl:c=drone=0.2|aging=0.5

+@end example

+

+@item

+Apply bit crusher plugin from ArtyFX:

+@example

+lv2=p=http\\\\://www.openavproductions.com/artyfx#bitta:c=crush=0.3

+@end example

+@end itemize

+

 @section mcompand

 Multiband Compress or expand the audio's dynamic range.

@@ -101,6 +101,7 @@ OBJS-$(CONFIG_JOIN_FILTER)                   += af_join.o

 OBJS-$(CONFIG_LADSPA_FILTER)                 += af_ladspa.o

 OBJS-$(CONFIG_LOUDNORM_FILTER)               += af_loudnorm.o ebur128.o

 OBJS-$(CONFIG_LOWPASS_FILTER)                += af_biquads.o

+OBJS-$(CONFIG_LV2_FILTER)                    += af_lv2.o

 OBJS-$(CONFIG_MCOMPAND_FILTER)               += af_mcompand.o

 OBJS-$(CONFIG_PAN_FILTER)                    += af_pan.o

 OBJS-$(CONFIG_REPLAYGAIN_FILTER)             += af_replaygain.o

new file mode 100644

@@ -0,0 +1,602 @@

+/*

+ * Copyright (c) 2017 Paul B Mahol

+ * Copyright (c) 2007-2016 David Robillard <http://drobilla.net>

+ *

+ * 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

+ */

+

+/**

+ * @file

+ * LV2 wrapper

+ */

+

+#include <lilv/lilv.h>

+#include <lv2/lv2plug.in/ns/ext/atom/atom.h>

+#include <lv2/lv2plug.in/ns/ext/buf-size/buf-size.h>

+

+#include "libavutil/avassert.h"

+#include "libavutil/avstring.h"

+#include "libavutil/channel_layout.h"

+#include "libavutil/opt.h"

+#include "audio.h"

+#include "avfilter.h"

+#include "internal.h"

+

+typedef struct URITable {

+    char    **uris;

+    size_t    n_uris;

+} URITable;

+

+typedef struct LV2Context {

+    const AVClass *class;

+    char *plugin_uri;

+    char *options;

+

+    unsigned nb_inputs;

+    unsigned nb_inputcontrols;

+    unsigned nb_outputs;

+

+    int sample_rate;

+    int nb_samples;

+    int64_t pts;

+    int64_t duration;

+

+    LilvWorld         *world;

+    const LilvPlugin  *plugin;

+    uint32_t           nb_ports;

+    float             *values;

+    URITable           uri_table;

+    LV2_URID_Map       map;

+    LV2_Feature        map_feature;

+    LV2_URID_Unmap     unmap;

+    LV2_Feature        unmap_feature;

+    LV2_Atom_Sequence  seq_in[2];

+    LV2_Atom_Sequence *seq_out;

+    const LV2_Feature *features[5];

+

+    float *mins;

+    float *maxes;

+    float *controls;

+

+    LilvInstance *instance;

+

+    LilvNode  *atom_AtomPort;

+    LilvNode  *atom_Sequence;

+    LilvNode  *lv2_AudioPort;

+    LilvNode  *lv2_CVPort;

+    LilvNode  *lv2_ControlPort;

+    LilvNode  *lv2_Optional;

+    LilvNode  *lv2_InputPort;

+    LilvNode  *lv2_OutputPort;

+    LilvNode  *urid_map;

+    LilvNode  *powerOf2BlockLength;

+    LilvNode  *fixedBlockLength;

+    LilvNode  *boundedBlockLength;

+} LV2Context;

+

+#define OFFSET(x) offsetof(LV2Context, x)

+#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM

+

+static const AVOption lv2_options[] = {

+    { "plugin", "set plugin uri", OFFSET(plugin_uri), AV_OPT_TYPE_STRING, .flags = FLAGS },

+    { "p",      "set plugin uri", OFFSET(plugin_uri), AV_OPT_TYPE_STRING, .flags = FLAGS },

+    { "controls", "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },

+    { "c",        "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },

+    { "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },

+    { "s",           "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },

+    { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },

+    { "n",          "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },

+    { "duration", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },

+    { "d",        "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },

+    { NULL }

+};

+

+AVFILTER_DEFINE_CLASS(lv2);

+

+static void uri_table_init(URITable *table)

+{

+    table->uris   = NULL;

+    table->n_uris = 0;

+}

+

+static void uri_table_destroy(URITable *table)

+{

+    int i;

+

+    for (i = 0; i < table->n_uris; i++) {

+        av_freep(&table->uris[i]);

+    }

+

+    av_freep(&table->uris);

+}

+

+static LV2_URID uri_table_map(LV2_URID_Map_Handle handle, const char *uri)

+{

+    URITable *table = (URITable*)handle;

+    const size_t len = strlen(uri);

+    size_t i;

+    char **tmp;

+

+    for (i = 0; i < table->n_uris; i++) {

+        if (!strcmp(table->uris[i], uri)) {

+            return i + 1;

+        }

+    }

+

+    tmp = av_calloc(table->n_uris + 1, sizeof(char*));

+    if (!tmp)

+        return table->n_uris;

+    memcpy(tmp, table->uris, table->n_uris * sizeof(char**));

+

+    av_free(table->uris);

+    table->uris = tmp;

+    table->uris[table->n_uris] = av_malloc(len + 1);

+    if (!table->uris[table->n_uris])

+        return table->n_uris;

+

+    memcpy(table->uris[table->n_uris], uri, len + 1);

+    table->n_uris++;

+

+    return table->n_uris;

+}

+

+static const char *uri_table_unmap(LV2_URID_Map_Handle handle, LV2_URID urid)

+{

+    URITable *table = (URITable*)handle;

+

+    if (urid > 0 && urid <= table->n_uris) {

+        return table->uris[urid - 1];

+    }

+

+    return NULL;

+}

+

+static void connect_ports(LV2Context *s, AVFrame *in, AVFrame *out)

+{

+    int ich = 0, och = 0, i;

+

+    for (i = 0; i < s->nb_ports; i++) {

+        const LilvPort *port = lilv_plugin_get_port_by_index(s->plugin, i);

+

+        if (lilv_port_is_a(s->plugin, port, s->lv2_AudioPort) ||

+            lilv_port_is_a(s->plugin, port, s->lv2_CVPort)) {

+            if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort)) {

+                lilv_instance_connect_port(s->instance, i, in->extended_data[ich++]);

+            } else if (lilv_port_is_a(s->plugin, port, s->lv2_OutputPort)) {

+                lilv_instance_connect_port(s->instance, i, out->extended_data[och++]);

+            } else {

+                av_log(s, AV_LOG_WARNING, "port %d neither input nor output, skipping\n", i);

+            }

+        } else if (lilv_port_is_a(s->plugin, port, s->atom_AtomPort)) {

+            if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort)) {

+                lilv_instance_connect_port(s->instance, i, &s->seq_in);

+            } else {

+                lilv_instance_connect_port(s->instance, i, s->seq_out);

+            }

+        } else if (lilv_port_is_a(s->plugin, port, s->lv2_ControlPort)) {

+            lilv_instance_connect_port(s->instance, i, &s->controls[i]);

+        }

+    }

+

+    s->seq_in[0].atom.size = sizeof(LV2_Atom_Sequence_Body);

+    s->seq_in[0].atom.type = uri_table_map(&s->uri_table, LV2_ATOM__Sequence);

+    s->seq_out->atom.size  = 9624;

+    s->seq_out->atom.type  = uri_table_map(&s->uri_table, LV2_ATOM__Chunk);

+}

+

+static int filter_frame(AVFilterLink *inlink, AVFrame *in)

+{

+    AVFilterContext *ctx = inlink->dst;

+    LV2Context *s = ctx->priv;

+    AVFrame *out;

+

+    if (!s->nb_outputs ||

+        (av_frame_is_writable(in) && s->nb_inputs == s->nb_outputs)) {

+        out = in;

+    } else {

+        out = ff_get_audio_buffer(ctx->outputs[0], in->nb_samples);

+        if (!out) {

+            av_frame_free(&in);

+            return AVERROR(ENOMEM);

+        }

+        av_frame_copy_props(out, in);

+    }

+

+    connect_ports(s, in, out);

+

+    lilv_instance_run(s->instance, in->nb_samples);

+

+    if (out != in)

+        av_frame_free(&in);

+

+    return ff_filter_frame(ctx->outputs[0], out);

+}

+

+static int request_frame(AVFilterLink *outlink)

+{

+    AVFilterContext *ctx = outlink->src;

+    LV2Context *s = ctx->priv;

+    AVFrame *out;

+    int64_t t;

+

+    if (ctx->nb_inputs)

+        return ff_request_frame(ctx->inputs[0]);

+

+    t = av_rescale(s->pts, AV_TIME_BASE, s->sample_rate);

+    if (s->duration >= 0 && t >= s->duration)

+        return AVERROR_EOF;

+

+    out = ff_get_audio_buffer(outlink, s->nb_samples);

+    if (!out)

+        return AVERROR(ENOMEM);

+

+    connect_ports(s, out, out);

+

+    lilv_instance_run(s->instance, out->nb_samples);

+

+    out->sample_rate = s->sample_rate;

+    out->pts         = s->pts;

+    s->pts          += s->nb_samples;

+

+    return ff_filter_frame(outlink, out);

+}

+

+static const LV2_Feature buf_size_features[3] = {

+    { LV2_BUF_SIZE__powerOf2BlockLength, NULL },

+    { LV2_BUF_SIZE__fixedBlockLength,    NULL },

+    { LV2_BUF_SIZE__boundedBlockLength,  NULL },

+};

+

+static int config_output(AVFilterLink *outlink)

+{

+    AVFilterContext *ctx = outlink->src;

+    LV2Context *s = ctx->priv;

+    char *p, *arg, *saveptr = NULL;

+    int i, sample_rate;

+

+    uri_table_init(&s->uri_table);

+    s->map.handle = &s->uri_table;

+    s->map.map = uri_table_map;

+    s->map_feature.URI = LV2_URID_MAP_URI;

+    s->map_feature.data = &s->map;

+    s->unmap.handle = &s->uri_table;

+    s->unmap.unmap  = uri_table_unmap;

+    s->unmap_feature.URI = LV2_URID_UNMAP_URI;

+    s->unmap_feature.data = &s->unmap;

+    s->features[0] = &s->map_feature;

+    s->features[1] = &s->unmap_feature;

+    s->features[2] = &buf_size_features[0];

+    s->features[3] = &buf_size_features[1];

+    s->features[4] = &buf_size_features[2];

+

+    if (ctx->nb_inputs) {

+        AVFilterLink *inlink = ctx->inputs[0];

+

+        outlink->format      = inlink->format;

+        outlink->sample_rate = sample_rate = inlink->sample_rate;

+        if (s->nb_inputs == s->nb_outputs) {

+            outlink->channel_layout = inlink->channel_layout;

+            outlink->channels = inlink->channels;

+        }

+

+    } else {

+        outlink->sample_rate = sample_rate = s->sample_rate;

+        outlink->time_base   = (AVRational){1, s->sample_rate};

+    }

+

+    s->instance = lilv_plugin_instantiate(s->plugin, sample_rate, s->features);

+    if (!s->instance) {

+        av_log(s, AV_LOG_ERROR, "Failed to instantiate <%s>\n", lilv_node_as_uri(lilv_plugin_get_uri(s->plugin)));

+        return AVERROR(EINVAL);

+    }

+

+    s->mins     = av_calloc(s->nb_ports, sizeof(float));

+    s->maxes    = av_calloc(s->nb_ports, sizeof(float));

+    s->controls = av_calloc(s->nb_ports, sizeof(float));

+

+    if (!s->mins || !s->maxes || !s->controls)

+        return AVERROR(ENOMEM);

+

+    lilv_plugin_get_port_ranges_float(s->plugin, s->mins, s->maxes, s->controls);

+    s->seq_out = av_malloc(sizeof(LV2_Atom_Sequence) + 9624);

+    if (!s->seq_out)

+        return AVERROR(ENOMEM);

+

+    if (s->options && !strcmp(s->options, "help")) {

+        if (!s->nb_inputcontrols) {

+            av_log(ctx, AV_LOG_INFO,

+                   "The '%s' plugin does not have any input controls.\n",

+                   s->plugin_uri);

+        } else {

+            av_log(ctx, AV_LOG_INFO,

+                   "The '%s' plugin has the following input controls:\n",

+                   s->plugin_uri);

+            for (i = 0; i < s->nb_ports; i++) {

+                const LilvPort *port = lilv_plugin_get_port_by_index(s->plugin, i);

+                const LilvNode *symbol = lilv_port_get_symbol(s->plugin, port);

+                LilvNode *name = lilv_port_get_name(s->plugin, port);

+

+                if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort) &&

+                    lilv_port_is_a(s->plugin, port, s->lv2_ControlPort)) {

+                    av_log(ctx, AV_LOG_INFO, "%s\t\t<float> (from %f to %f) (default %f)\t\t%s\n",

+                           lilv_node_as_string(symbol), s->mins[i], s->maxes[i], s->controls[i],

+                           lilv_node_as_string(name));

+                }

+

+                lilv_node_free(name);

+            }

+        }

+        return AVERROR_EXIT;

+    }

+

+    p = s->options;

+    while (s->options) {

+        const LilvPort *port;

+        LilvNode *sym;

+        float val;

+        char *str, *vstr;

+        int index;

+

+        if (!(arg = av_strtok(p, " |", &saveptr)))

+            break;

+        p = NULL;

+

+        vstr = strstr(arg, "=");

+        if (vstr == NULL) {

+            av_log(ctx, AV_LOG_ERROR, "Invalid syntax.\n");

+            return AVERROR(EINVAL);

+        }

+

+        vstr[0] = 0;

+        str  = arg;

+        val  = atof(vstr+1);

+        sym  = lilv_new_string(s->world, str);

+        port = lilv_plugin_get_port_by_symbol(s->plugin, sym);

+        lilv_node_free(sym);

+        if (!port) {

+            av_log(s, AV_LOG_WARNING, "Unknown option: <%s>\n", str);

+        } else {

+            index = lilv_port_get_index(s->plugin, port);

+            s->controls[index] = val;

+        }

+    }

+

+    if (s->nb_inputs &&

+        (lilv_plugin_has_feature(s->plugin, s->powerOf2BlockLength) ||

+         lilv_plugin_has_feature(s->plugin, s->fixedBlockLength) ||

+         lilv_plugin_has_feature(s->plugin, s->boundedBlockLength))) {

+        AVFilterLink *inlink = ctx->inputs[0];

+

+        inlink->partial_buf_size = inlink->min_samples = inlink->max_samples = 4096;

+    }

+

+    return 0;

+}

+

+static av_cold int init(AVFilterContext *ctx)

+{

+    LV2Context *s = ctx->priv;

+    const LilvPlugins *plugins;

+    const LilvPlugin *plugin;

+    AVFilterPad pad = { NULL };

+    LilvNode *uri;

+    int i;

+

+    s->world = lilv_world_new();

+    if (!s->world)

+        return AVERROR(ENOMEM);

+

+    uri = lilv_new_uri(s->world, s->plugin_uri);

+    if (!uri) {

+        av_log(s, AV_LOG_ERROR, "Invalid plugin URI <%s>\n", s->plugin_uri);

+        return AVERROR(EINVAL);

+    }

+

+    lilv_world_load_all(s->world);

+    plugins = lilv_world_get_all_plugins(s->world);

+    plugin  = lilv_plugins_get_by_uri(plugins, uri);

+    lilv_node_free(uri);

+

+    if (!plugin) {

+        av_log(s, AV_LOG_ERROR, "Plugin <%s> not found\n", s->plugin_uri);

+        return AVERROR(EINVAL);

+    }

+

+    s->plugin = plugin;

+    s->nb_ports = lilv_plugin_get_num_ports(s->plugin);

+

+    s->lv2_InputPort       = lilv_new_uri(s->world, LV2_CORE__InputPort);

+    s->lv2_OutputPort      = lilv_new_uri(s->world, LV2_CORE__OutputPort);

+    s->lv2_AudioPort       = lilv_new_uri(s->world, LV2_CORE__AudioPort);

+    s->lv2_ControlPort     = lilv_new_uri(s->world, LV2_CORE__ControlPort);

+    s->lv2_Optional        = lilv_new_uri(s->world, LV2_CORE__connectionOptional);

+    s->atom_AtomPort       = lilv_new_uri(s->world, LV2_ATOM__AtomPort);

+    s->atom_Sequence       = lilv_new_uri(s->world, LV2_ATOM__Sequence);

+    s->urid_map            = lilv_new_uri(s->world, LV2_URID__map);

+    s->powerOf2BlockLength = lilv_new_uri(s->world, LV2_BUF_SIZE__powerOf2BlockLength);

+    s->fixedBlockLength    = lilv_new_uri(s->world, LV2_BUF_SIZE__fixedBlockLength);

+    s->boundedBlockLength  = lilv_new_uri(s->world, LV2_BUF_SIZE__boundedBlockLength);

+

+    for (i = 0; i < s->nb_ports; i++) {

+        const LilvPort *lport = lilv_plugin_get_port_by_index(s->plugin, i);

+        int is_input = 0;

+        int is_optional = 0;

+

+        is_optional = lilv_port_has_property(s->plugin, lport, s->lv2_Optional);

+

+        if (lilv_port_is_a(s->plugin, lport, s->lv2_InputPort)) {

+            is_input = 1;

+        } else if (!lilv_port_is_a(s->plugin, lport, s->lv2_OutputPort) && !is_optional) {

+            return AVERROR(EINVAL);

+        }

+

+        if (lilv_port_is_a(s->plugin, lport, s->lv2_ControlPort)) {

+            if (is_input) {

+                s->nb_inputcontrols++;

+            }

+        } else if (lilv_port_is_a(s->plugin, lport, s->lv2_AudioPort)) {

+            if (is_input) {

+                s->nb_inputs++;

+            } else {

+                s->nb_outputs++;

+            }

+        }

+    }

+

+    pad.type = AVMEDIA_TYPE_AUDIO;

+

+    if (s->nb_inputs) {

+        pad.name = av_asprintf("in0:%s:%u", s->plugin_uri, s->nb_inputs);

+        if (!pad.name)

+            return AVERROR(ENOMEM);

+

+        pad.filter_frame = filter_frame;

+        if (ff_insert_inpad(ctx, ctx->nb_inputs, &pad) < 0) {

+            av_freep(&pad.name);

+            return AVERROR(ENOMEM);

+        }

+    }

+

+    return 0;

+}

+

+static int query_formats(AVFilterContext *ctx)

+{

+    LV2Context *s = ctx->priv;

+    AVFilterFormats *formats;

+    AVFilterChannelLayouts *layouts;

+    AVFilterLink *outlink = ctx->outputs[0];

+    static const enum AVSampleFormat sample_fmts[] = {

+        AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };

+    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;

+

+    if (s->nb_inputs) {

+        formats = ff_all_samplerates();

+        if (!formats)

+            return AVERROR(ENOMEM);

+

+        ret = ff_set_common_samplerates(ctx, formats);

+        if (ret < 0)

+            return ret;

+    } else {

+        int sample_rates[] = { s->sample_rate, -1 };

+

+        ret = ff_set_common_samplerates(ctx, ff_make_format_list(sample_rates));

+        if (ret < 0)

+            return ret;

+    }

+

+    if (s->nb_inputs == 2 && s->nb_outputs == 2) {

+        layouts = NULL;

+        ret = ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO);

+        if (ret < 0)

+            return ret;

+        ret = ff_set_common_channel_layouts(ctx, layouts);

+        if (ret < 0)

+            return ret;

+    } else {

+        if (s->nb_inputs >= 1) {

+            AVFilterLink *inlink = ctx->inputs[0];

+            uint64_t inlayout = FF_COUNT2LAYOUT(s->nb_inputs);

+

+            layouts = NULL;

+            ret = ff_add_channel_layout(&layouts, inlayout);

+            if (ret < 0)

+                return ret;

+            ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);

+            if (ret < 0)

+                return ret;

+

+            if (!s->nb_outputs) {

+                ret = ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);

+                if (ret < 0)

+                    return ret;

+            }

+        }

+

+        if (s->nb_outputs >= 1) {

+            uint64_t outlayout = FF_COUNT2LAYOUT(s->nb_outputs);

+

+            layouts = NULL;

+            ret = ff_add_channel_layout(&layouts, outlayout);

+            if (ret < 0)

+                return ret;

+            ret = ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);

+            if (ret < 0)

+                return ret;

+        }

+    }

+

+    return 0;

+}

+

+static av_cold void uninit(AVFilterContext *ctx)

+{

+    LV2Context *s = ctx->priv;

+

+    lilv_node_free(s->powerOf2BlockLength);

+    lilv_node_free(s->fixedBlockLength);

+    lilv_node_free(s->boundedBlockLength);

+    lilv_node_free(s->urid_map);

+    lilv_node_free(s->atom_Sequence);

+    lilv_node_free(s->atom_AtomPort);

+    lilv_node_free(s->lv2_Optional);

+    lilv_node_free(s->lv2_ControlPort);

+    lilv_node_free(s->lv2_AudioPort);

+    lilv_node_free(s->lv2_OutputPort);

+    lilv_node_free(s->lv2_InputPort);

+    uri_table_destroy(&s->uri_table);

+    lilv_instance_free(s->instance);

+    lilv_world_free(s->world);

+    av_freep(&s->mins);

+    av_freep(&s->maxes);

+    av_freep(&s->controls);

+    av_freep(&s->seq_out);

+

+    if (ctx->nb_inputs)

+        av_freep(&ctx->input_pads[0].name);

+}

+

+static const AVFilterPad lv2_outputs[] = {

+    {

+        .name          = "default",

+        .type          = AVMEDIA_TYPE_AUDIO,

+        .config_props  = config_output,

+        .request_frame = request_frame,

+    },

+    { NULL }

+};

+

+AVFilter ff_af_lv2 = {

+    .name          = "lv2",

+    .description   = NULL_IF_CONFIG_SMALL("Apply LV2 effect."),

+    .priv_size     = sizeof(LV2Context),

+    .priv_class    = &lv2_class,

+    .init          = init,

+    .uninit        = uninit,

+    .query_formats = query_formats,

+    .inputs        = 0,

+    .outputs       = lv2_outputs,

+    .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,

+};

@@ -112,6 +112,7 @@ static void register_all(void)

     REGISTER_FILTER(LADSPA,         ladspa,         af);

     REGISTER_FILTER(LOUDNORM,       loudnorm,       af);

     REGISTER_FILTER(LOWPASS,        lowpass,        af);

+    REGISTER_FILTER(LV2,            lv2,            af);

     REGISTER_FILTER(MCOMPAND,       mcompand,       af);

     REGISTER_FILTER(PAN,            pan,            af);

     REGISTER_FILTER(REPLAYGAIN,     replaygain,     af);

@@ -30,7 +30,7 @@

 #include "libavutil/version.h"

 #define LIBAVFILTER_VERSION_MAJOR   7

-#define LIBAVFILTER_VERSION_MINOR   4

+#define LIBAVFILTER_VERSION_MINOR   5

 #define LIBAVFILTER_VERSION_MICRO 100

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \