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diff --git a/plugins/eg-sampler.lv2/uris.h b/plugins/eg-sampler.lv2/uris.h
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+/*
+ LV2 Sampler Example Plugin
+ Copyright 2011-2016 David Robillard <d@drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef SAMPLER_URIS_H
+#define SAMPLER_URIS_H
+
+#include "lv2/log/log.h"
+#include "lv2/midi/midi.h"
+#include "lv2/parameters/parameters.h"
+#include "lv2/patch/patch.h"
+#include "lv2/state/state.h"
+
+#include <stdio.h>
+
+#define EG_SAMPLER_URI "http://lv2plug.in/plugins/eg-sampler"
+#define EG_SAMPLER__applySample EG_SAMPLER_URI "#applySample"
+#define EG_SAMPLER__freeSample EG_SAMPLER_URI "#freeSample"
+#define EG_SAMPLER__sample EG_SAMPLER_URI "#sample"
+
+typedef struct {
+ LV2_URID atom_Float;
+ LV2_URID atom_Path;
+ LV2_URID atom_Resource;
+ LV2_URID atom_Sequence;
+ LV2_URID atom_URID;
+ LV2_URID atom_eventTransfer;
+ LV2_URID eg_applySample;
+ LV2_URID eg_freeSample;
+ LV2_URID eg_sample;
+ LV2_URID midi_Event;
+ LV2_URID param_gain;
+ LV2_URID patch_Get;
+ LV2_URID patch_Set;
+ LV2_URID patch_accept;
+ LV2_URID patch_property;
+ LV2_URID patch_value;
+} SamplerURIs;
+
+static inline void
+map_sampler_uris(LV2_URID_Map* map, SamplerURIs* uris)
+{
+ uris->atom_Float = map->map(map->handle, LV2_ATOM__Float);
+ uris->atom_Path = map->map(map->handle, LV2_ATOM__Path);
+ uris->atom_Resource = map->map(map->handle, LV2_ATOM__Resource);
+ uris->atom_Sequence = map->map(map->handle, LV2_ATOM__Sequence);
+ uris->atom_URID = map->map(map->handle, LV2_ATOM__URID);
+ uris->atom_eventTransfer = map->map(map->handle, LV2_ATOM__eventTransfer);
+ uris->eg_applySample = map->map(map->handle, EG_SAMPLER__applySample);
+ uris->eg_freeSample = map->map(map->handle, EG_SAMPLER__freeSample);
+ uris->eg_sample = map->map(map->handle, EG_SAMPLER__sample);
+ uris->midi_Event = map->map(map->handle, LV2_MIDI__MidiEvent);
+ uris->param_gain = map->map(map->handle, LV2_PARAMETERS__gain);
+ uris->patch_Get = map->map(map->handle, LV2_PATCH__Get);
+ uris->patch_Set = map->map(map->handle, LV2_PATCH__Set);
+ uris->patch_accept = map->map(map->handle, LV2_PATCH__accept);
+ uris->patch_property = map->map(map->handle, LV2_PATCH__property);
+ uris->patch_value = map->map(map->handle, LV2_PATCH__value);
+}
+
+/**
+ Write a message like the following to `forge`:
+ [source,n3]
+ ----
+ []
+ a patch:Set ;
+ patch:property eg:sample ;
+ patch:value </home/me/foo.wav> .
+ ----
+*/
+static inline LV2_Atom_Forge_Ref
+write_set_file(LV2_Atom_Forge* forge,
+ const SamplerURIs* uris,
+ const char* filename,
+ const uint32_t filename_len)
+{
+ LV2_Atom_Forge_Frame frame;
+ LV2_Atom_Forge_Ref set = lv2_atom_forge_object(
+ forge, &frame, 0, uris->patch_Set);
+
+ lv2_atom_forge_key(forge, uris->patch_property);
+ lv2_atom_forge_urid(forge, uris->eg_sample);
+ lv2_atom_forge_key(forge, uris->patch_value);
+ lv2_atom_forge_path(forge, filename, filename_len);
+
+ lv2_atom_forge_pop(forge, &frame);
+ return set;
+}
+
+/**
+ Get the file path from `obj` which is a message like:
+ [source,n3]
+ ----
+ []
+ a patch:Set ;
+ patch:property eg:sample ;
+ patch:value </home/me/foo.wav> .
+ ----
+*/
+static inline const char*
+read_set_file(const SamplerURIs* uris,
+ const LV2_Atom_Object* obj)
+{
+ if (obj->body.otype != uris->patch_Set) {
+ fprintf(stderr, "Ignoring unknown message type %d\n", obj->body.otype);
+ return NULL;
+ }
+
+ /* Get property URI. */
+ const LV2_Atom* property = NULL;
+ lv2_atom_object_get(obj, uris->patch_property, &property, 0);
+ if (!property) {
+ fprintf(stderr, "Malformed set message has no body.\n");
+ return NULL;
+ } else if (property->type != uris->atom_URID) {
+ fprintf(stderr, "Malformed set message has non-URID property.\n");
+ return NULL;
+ } else if (((const LV2_Atom_URID*)property)->body != uris->eg_sample) {
+ fprintf(stderr, "Set message for unknown property.\n");
+ return NULL;
+ }
+
+ /* Get value. */
+ const LV2_Atom* value = NULL;
+ lv2_atom_object_get(obj, uris->patch_value, &value, 0);
+ if (!value) {
+ fprintf(stderr, "Malformed set message has no value.\n");
+ return NULL;
+ } else if (value->type != uris->atom_Path) {
+ fprintf(stderr, "Set message value is not a Path.\n");
+ return NULL;
+ }
+
+ return (const char*)LV2_ATOM_BODY_CONST(value);
+}
+
+#endif /* SAMPLER_URIS_H */