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FFmpeg4/libavfilter/af_lv2.c

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/*
* 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,
};
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