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+/*
+ Copyright 2008-2016 David Robillard <http://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.
+*/
+
+/**
+ @file forge.h An API for constructing LV2 atoms.
+
+ This file provides an API for constructing Atoms which makes it relatively
+ simple to build nested atoms of arbitrary complexity without requiring
+ dynamic memory allocation.
+
+ The API is based on successively appending the appropriate pieces to build a
+ complete Atom. The size of containers is automatically updated. Functions
+ that begin a container return (via their frame argument) a stack frame which
+ must be popped when the container is finished.
+
+ All output is written to a user-provided buffer or sink function. This
+ makes it popssible to create create atoms on the stack, on the heap, in LV2
+ port buffers, in a ringbuffer, or elsewhere, all using the same API.
+
+ This entire API is realtime safe if used with a buffer or a realtime safe
+ sink, except lv2_atom_forge_init() which is only realtime safe if the URI
+ map function is.
+
+ Note these functions are all static inline, do not take their address.
+
+ This header is non-normative, it is provided for convenience.
+*/
+
+/**
+ @defgroup forge Forge
+ @ingroup atom
+ @{
+*/
+
+#ifndef LV2_ATOM_FORGE_H
+#define LV2_ATOM_FORGE_H
+
+#include "lv2/atom/atom.h"
+#include "lv2/atom/util.h"
+#include "lv2/core/attributes.h"
+#include "lv2/urid/urid.h"
+
+#include <assert.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Disable deprecation warnings for Blank and Resource
+LV2_DISABLE_DEPRECATION_WARNINGS
+
+/** Handle for LV2_Atom_Forge_Sink. */
+typedef void* LV2_Atom_Forge_Sink_Handle;
+
+/** A reference to a chunk of written output. */
+typedef intptr_t LV2_Atom_Forge_Ref;
+
+/** Sink function for writing output. See lv2_atom_forge_set_sink(). */
+typedef LV2_Atom_Forge_Ref
+(*LV2_Atom_Forge_Sink)(LV2_Atom_Forge_Sink_Handle handle,
+ const void* buf,
+ uint32_t size);
+
+/** Function for resolving a reference. See lv2_atom_forge_set_sink(). */
+typedef LV2_Atom*
+(*LV2_Atom_Forge_Deref_Func)(LV2_Atom_Forge_Sink_Handle handle,
+ LV2_Atom_Forge_Ref ref);
+
+/** A stack frame used for keeping track of nested Atom containers. */
+typedef struct _LV2_Atom_Forge_Frame {
+ struct _LV2_Atom_Forge_Frame* parent;
+ LV2_Atom_Forge_Ref ref;
+} LV2_Atom_Forge_Frame;
+
+/** A "forge" for creating atoms by appending to a buffer. */
+typedef struct {
+ uint8_t* buf;
+ uint32_t offset;
+ uint32_t size;
+
+ LV2_Atom_Forge_Sink sink;
+ LV2_Atom_Forge_Deref_Func deref;
+ LV2_Atom_Forge_Sink_Handle handle;
+
+ LV2_Atom_Forge_Frame* stack;
+
+ LV2_URID Blank LV2_DEPRECATED;
+ LV2_URID Bool;
+ LV2_URID Chunk;
+ LV2_URID Double;
+ LV2_URID Float;
+ LV2_URID Int;
+ LV2_URID Long;
+ LV2_URID Literal;
+ LV2_URID Object;
+ LV2_URID Path;
+ LV2_URID Property;
+ LV2_URID Resource LV2_DEPRECATED;
+ LV2_URID Sequence;
+ LV2_URID String;
+ LV2_URID Tuple;
+ LV2_URID URI;
+ LV2_URID URID;
+ LV2_URID Vector;
+} LV2_Atom_Forge;
+
+static inline void
+lv2_atom_forge_set_buffer(LV2_Atom_Forge* forge, uint8_t* buf, size_t size);
+
+/**
+ Initialise `forge`.
+
+ URIs will be mapped using `map` and stored, a reference to `map` itself is
+ not held.
+*/
+static inline void
+lv2_atom_forge_init(LV2_Atom_Forge* forge, LV2_URID_Map* map)
+{
+ lv2_atom_forge_set_buffer(forge, NULL, 0);
+ forge->Blank = map->map(map->handle, LV2_ATOM__Blank);
+ forge->Bool = map->map(map->handle, LV2_ATOM__Bool);
+ forge->Chunk = map->map(map->handle, LV2_ATOM__Chunk);
+ forge->Double = map->map(map->handle, LV2_ATOM__Double);
+ forge->Float = map->map(map->handle, LV2_ATOM__Float);
+ forge->Int = map->map(map->handle, LV2_ATOM__Int);
+ forge->Long = map->map(map->handle, LV2_ATOM__Long);
+ forge->Literal = map->map(map->handle, LV2_ATOM__Literal);
+ forge->Object = map->map(map->handle, LV2_ATOM__Object);
+ forge->Path = map->map(map->handle, LV2_ATOM__Path);
+ forge->Property = map->map(map->handle, LV2_ATOM__Property);
+ forge->Resource = map->map(map->handle, LV2_ATOM__Resource);
+ forge->Sequence = map->map(map->handle, LV2_ATOM__Sequence);
+ forge->String = map->map(map->handle, LV2_ATOM__String);
+ forge->Tuple = map->map(map->handle, LV2_ATOM__Tuple);
+ forge->URI = map->map(map->handle, LV2_ATOM__URI);
+ forge->URID = map->map(map->handle, LV2_ATOM__URID);
+ forge->Vector = map->map(map->handle, LV2_ATOM__Vector);
+}
+
+/** Access the Atom pointed to by a reference. */
+static inline LV2_Atom*
+lv2_atom_forge_deref(LV2_Atom_Forge* forge, LV2_Atom_Forge_Ref ref)
+{
+ return forge->buf ? (LV2_Atom*)ref : forge->deref(forge->handle, ref);
+}
+
+/**
+ @name Object Stack
+ @{
+*/
+
+/**
+ Push a stack frame.
+ This is done automatically by container functions (which take a stack frame
+ pointer), but may be called by the user to push the top level container when
+ writing to an existing Atom.
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_push(LV2_Atom_Forge* forge,
+ LV2_Atom_Forge_Frame* frame,
+ LV2_Atom_Forge_Ref ref)
+{
+ frame->parent = forge->stack;
+ frame->ref = ref;
+
+ if (ref) {
+ forge->stack = frame; // Don't push, so walking the stack is always safe
+ }
+
+ return ref;
+}
+
+/** Pop a stack frame. This must be called when a container is finished. */
+static inline void
+lv2_atom_forge_pop(LV2_Atom_Forge* forge, LV2_Atom_Forge_Frame* frame)
+{
+ if (frame->ref) {
+ // If frame has a valid ref, it must be the top of the stack
+ assert(frame == forge->stack);
+ forge->stack = frame->parent;
+ }
+ // Otherwise, frame was not pushed because of overflow, do nothing
+}
+
+/** Return true iff the top of the stack has the given type. */
+static inline bool
+lv2_atom_forge_top_is(LV2_Atom_Forge* forge, uint32_t type)
+{
+ return forge->stack && forge->stack->ref &&
+ (lv2_atom_forge_deref(forge, forge->stack->ref)->type == type);
+}
+
+/** Return true iff `type` is an atom:Object. */
+static inline bool
+lv2_atom_forge_is_object_type(const LV2_Atom_Forge* forge, uint32_t type)
+{
+ return (type == forge->Object ||
+ type == forge->Blank ||
+ type == forge->Resource);
+}
+
+/** Return true iff `type` is an atom:Object with a blank ID. */
+static inline bool
+lv2_atom_forge_is_blank(const LV2_Atom_Forge* forge,
+ uint32_t type,
+ const LV2_Atom_Object_Body* body)
+{
+ return (type == forge->Blank ||
+ (type == forge->Object && body->id == 0));
+}
+
+/**
+ @}
+ @name Output Configuration
+ @{
+*/
+
+/** Set the output buffer where `forge` will write atoms. */
+static inline void
+lv2_atom_forge_set_buffer(LV2_Atom_Forge* forge, uint8_t* buf, size_t size)
+{
+ forge->buf = buf;
+ forge->size = (uint32_t)size;
+ forge->offset = 0;
+ forge->deref = NULL;
+ forge->sink = NULL;
+ forge->handle = NULL;
+ forge->stack = NULL;
+}
+
+/**
+ Set the sink function where `forge` will write output.
+
+ The return value of forge functions is an LV2_Atom_Forge_Ref which is an
+ integer type safe to use as a pointer but is otherwise opaque. The sink
+ function must return a ref that can be dereferenced to access as least
+ sizeof(LV2_Atom) bytes of the written data, so sizes can be updated. For
+ ringbuffers, this should be possible as long as the size of the buffer is a
+ multiple of sizeof(LV2_Atom), since atoms are always aligned.
+
+ Note that 0 is an invalid reference, so if you are using a buffer offset be
+ sure to offset it such that 0 is never a valid reference. You will get
+ confusing errors otherwise.
+*/
+static inline void
+lv2_atom_forge_set_sink(LV2_Atom_Forge* forge,
+ LV2_Atom_Forge_Sink sink,
+ LV2_Atom_Forge_Deref_Func deref,
+ LV2_Atom_Forge_Sink_Handle handle)
+{
+ forge->buf = NULL;
+ forge->size = forge->offset = 0;
+ forge->deref = deref;
+ forge->sink = sink;
+ forge->handle = handle;
+ forge->stack = NULL;
+}
+
+/**
+ @}
+ @name Low Level Output
+ @{
+*/
+
+/**
+ Write raw output. This is used internally, but is also useful for writing
+ atom types not explicitly supported by the forge API. Note the caller is
+ responsible for ensuring the output is approriately padded.
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_raw(LV2_Atom_Forge* forge, const void* data, uint32_t size)
+{
+ LV2_Atom_Forge_Ref out = 0;
+ if (forge->sink) {
+ out = forge->sink(forge->handle, data, size);
+ } else {
+ out = (LV2_Atom_Forge_Ref)forge->buf + forge->offset;
+ uint8_t* mem = forge->buf + forge->offset;
+ if (forge->offset + size > forge->size) {
+ return 0;
+ }
+ forge->offset += size;
+ memcpy(mem, data, size);
+ }
+ for (LV2_Atom_Forge_Frame* f = forge->stack; f; f = f->parent) {
+ lv2_atom_forge_deref(forge, f->ref)->size += size;
+ }
+ return out;
+}
+
+/** Pad output accordingly so next write is 64-bit aligned. */
+static inline void
+lv2_atom_forge_pad(LV2_Atom_Forge* forge, uint32_t written)
+{
+ const uint64_t pad = 0;
+ const uint32_t pad_size = lv2_atom_pad_size(written) - written;
+ lv2_atom_forge_raw(forge, &pad, pad_size);
+}
+
+/** Write raw output, padding to 64-bits as necessary. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_write(LV2_Atom_Forge* forge, const void* data, uint32_t size)
+{
+ LV2_Atom_Forge_Ref out = lv2_atom_forge_raw(forge, data, size);
+ if (out) {
+ lv2_atom_forge_pad(forge, size);
+ }
+ return out;
+}
+
+/** Write a null-terminated string body. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_string_body(LV2_Atom_Forge* forge,
+ const char* str,
+ uint32_t len)
+{
+ LV2_Atom_Forge_Ref out = lv2_atom_forge_raw(forge, str, len);
+ if (out && (out = lv2_atom_forge_raw(forge, "", 1))) {
+ lv2_atom_forge_pad(forge, len + 1);
+ }
+ return out;
+}
+
+/**
+ @}
+ @name Atom Output
+ @{
+*/
+
+/** Write an atom:Atom header. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_atom(LV2_Atom_Forge* forge, uint32_t size, uint32_t type)
+{
+ const LV2_Atom a = { size, type };
+ return lv2_atom_forge_raw(forge, &a, sizeof(a));
+}
+
+/** Write a primitive (fixed-size) atom. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_primitive(LV2_Atom_Forge* forge, const LV2_Atom* a)
+{
+ return (lv2_atom_forge_top_is(forge, forge->Vector)
+ ? lv2_atom_forge_raw(forge, LV2_ATOM_BODY_CONST(a), a->size)
+ : lv2_atom_forge_write(
+ forge, a, (uint32_t)sizeof(LV2_Atom) + a->size));
+}
+
+/** Write an atom:Int. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_int(LV2_Atom_Forge* forge, int32_t val)
+{
+ const LV2_Atom_Int a = { { sizeof(val), forge->Int }, val };
+ return lv2_atom_forge_primitive(forge, &a.atom);
+}
+
+/** Write an atom:Long. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_long(LV2_Atom_Forge* forge, int64_t val)
+{
+ const LV2_Atom_Long a = { { sizeof(val), forge->Long }, val };
+ return lv2_atom_forge_primitive(forge, &a.atom);
+}
+
+/** Write an atom:Float. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_float(LV2_Atom_Forge* forge, float val)
+{
+ const LV2_Atom_Float a = { { sizeof(val), forge->Float }, val };
+ return lv2_atom_forge_primitive(forge, &a.atom);
+}
+
+/** Write an atom:Double. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_double(LV2_Atom_Forge* forge, double val)
+{
+ const LV2_Atom_Double a = { { sizeof(val), forge->Double }, val };
+ return lv2_atom_forge_primitive(forge, &a.atom);
+}
+
+/** Write an atom:Bool. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_bool(LV2_Atom_Forge* forge, bool val)
+{
+ const LV2_Atom_Bool a = { { sizeof(int32_t), forge->Bool }, val ? 1 : 0 };
+ return lv2_atom_forge_primitive(forge, &a.atom);
+}
+
+/** Write an atom:URID. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_urid(LV2_Atom_Forge* forge, LV2_URID id)
+{
+ const LV2_Atom_URID a = { { sizeof(id), forge->URID }, id };
+ return lv2_atom_forge_primitive(forge, &a.atom);
+}
+
+/** Write an atom compatible with atom:String. Used internally. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_typed_string(LV2_Atom_Forge* forge,
+ uint32_t type,
+ const char* str,
+ uint32_t len)
+{
+ const LV2_Atom_String a = { { len + 1, type } };
+ LV2_Atom_Forge_Ref out = lv2_atom_forge_raw(forge, &a, sizeof(a));
+ if (out) {
+ if (!lv2_atom_forge_string_body(forge, str, len)) {
+ LV2_Atom* atom = lv2_atom_forge_deref(forge, out);
+ atom->size = atom->type = 0;
+ out = 0;
+ }
+ }
+ return out;
+}
+
+/** Write an atom:String. Note that `str` need not be NULL terminated. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_string(LV2_Atom_Forge* forge, const char* str, uint32_t len)
+{
+ return lv2_atom_forge_typed_string(forge, forge->String, str, len);
+}
+
+/**
+ Write an atom:URI. Note that `uri` need not be NULL terminated.
+ This does not map the URI, but writes the complete URI string. To write
+ a mapped URI, use lv2_atom_forge_urid().
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_uri(LV2_Atom_Forge* forge, const char* uri, uint32_t len)
+{
+ return lv2_atom_forge_typed_string(forge, forge->URI, uri, len);
+}
+
+/** Write an atom:Path. Note that `path` need not be NULL terminated. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_path(LV2_Atom_Forge* forge, const char* path, uint32_t len)
+{
+ return lv2_atom_forge_typed_string(forge, forge->Path, path, len);
+}
+
+/** Write an atom:Literal. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_literal(LV2_Atom_Forge* forge,
+ const char* str,
+ uint32_t len,
+ uint32_t datatype,
+ uint32_t lang)
+{
+ const LV2_Atom_Literal a = {
+ { (uint32_t)(sizeof(LV2_Atom_Literal) - sizeof(LV2_Atom) + len + 1),
+ forge->Literal },
+ { datatype,
+ lang }
+ };
+ LV2_Atom_Forge_Ref out = lv2_atom_forge_raw(forge, &a, sizeof(a));
+ if (out) {
+ if (!lv2_atom_forge_string_body(forge, str, len)) {
+ LV2_Atom* atom = lv2_atom_forge_deref(forge, out);
+ atom->size = atom->type = 0;
+ out = 0;
+ }
+ }
+ return out;
+}
+
+/** Start an atom:Vector. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_vector_head(LV2_Atom_Forge* forge,
+ LV2_Atom_Forge_Frame* frame,
+ uint32_t child_size,
+ uint32_t child_type)
+{
+ const LV2_Atom_Vector a = {
+ { sizeof(LV2_Atom_Vector_Body), forge->Vector },
+ { child_size, child_type }
+ };
+ return lv2_atom_forge_push(
+ forge, frame, lv2_atom_forge_write(forge, &a, sizeof(a)));
+}
+
+/** Write a complete atom:Vector. */
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_vector(LV2_Atom_Forge* forge,
+ uint32_t child_size,
+ uint32_t child_type,
+ uint32_t n_elems,
+ const void* elems)
+{
+ const LV2_Atom_Vector a = {
+ { (uint32_t)(sizeof(LV2_Atom_Vector_Body) + n_elems * child_size),
+ forge->Vector },
+ { child_size, child_type }
+ };
+ LV2_Atom_Forge_Ref out = lv2_atom_forge_write(forge, &a, sizeof(a));
+ if (out) {
+ lv2_atom_forge_write(forge, elems, child_size * n_elems);
+ }
+ return out;
+}
+
+/**
+ Write the header of an atom:Tuple.
+
+ The passed frame will be initialised to represent this tuple. To complete
+ the tuple, write a sequence of atoms, then pop the frame with
+ lv2_atom_forge_pop().
+
+ For example:
+ @code
+ // Write tuple (1, 2.0)
+ LV2_Atom_Forge_Frame frame;
+ LV2_Atom* tup = (LV2_Atom*)lv2_atom_forge_tuple(forge, &frame);
+ lv2_atom_forge_int32(forge, 1);
+ lv2_atom_forge_float(forge, 2.0);
+ lv2_atom_forge_pop(forge, &frame);
+ @endcode
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_tuple(LV2_Atom_Forge* forge, LV2_Atom_Forge_Frame* frame)
+{
+ const LV2_Atom_Tuple a = { { 0, forge->Tuple } };
+ return lv2_atom_forge_push(
+ forge, frame, lv2_atom_forge_write(forge, &a, sizeof(a)));
+}
+
+/**
+ Write the header of an atom:Object.
+
+ The passed frame will be initialised to represent this object. To complete
+ the object, write a sequence of properties, then pop the frame with
+ lv2_atom_forge_pop().
+
+ For example:
+ @code
+ LV2_URID eg_Cat = map("http://example.org/Cat");
+ LV2_URID eg_name = map("http://example.org/name");
+
+ // Start object with type eg_Cat and blank ID
+ LV2_Atom_Forge_Frame frame;
+ lv2_atom_forge_object(forge, &frame, 0, eg_Cat);
+
+ // Append property eg:name = "Hobbes"
+ lv2_atom_forge_key(forge, eg_name);
+ lv2_atom_forge_string(forge, "Hobbes", strlen("Hobbes"));
+
+ // Finish object
+ lv2_atom_forge_pop(forge, &frame);
+ @endcode
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_object(LV2_Atom_Forge* forge,
+ LV2_Atom_Forge_Frame* frame,
+ LV2_URID id,
+ LV2_URID otype)
+{
+ const LV2_Atom_Object a = {
+ { (uint32_t)sizeof(LV2_Atom_Object_Body), forge->Object },
+ { id, otype }
+ };
+ return lv2_atom_forge_push(
+ forge, frame, lv2_atom_forge_write(forge, &a, sizeof(a)));
+}
+
+/**
+ The same as lv2_atom_forge_object(), but for object:Resource.
+
+ This function is deprecated and should not be used in new code.
+ Use lv2_atom_forge_object() directly instead.
+*/
+LV2_DEPRECATED
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_resource(LV2_Atom_Forge* forge,
+ LV2_Atom_Forge_Frame* frame,
+ LV2_URID id,
+ LV2_URID otype)
+{
+ const LV2_Atom_Object a = {
+ { (uint32_t)sizeof(LV2_Atom_Object_Body), forge->Resource },
+ { id, otype }
+ };
+ return lv2_atom_forge_push(
+ forge, frame, lv2_atom_forge_write(forge, &a, sizeof(a)));
+}
+
+/**
+ The same as lv2_atom_forge_object(), but for object:Blank.
+
+ This function is deprecated and should not be used in new code.
+ Use lv2_atom_forge_object() directly instead.
+*/
+LV2_DEPRECATED
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_blank(LV2_Atom_Forge* forge,
+ LV2_Atom_Forge_Frame* frame,
+ uint32_t id,
+ LV2_URID otype)
+{
+ const LV2_Atom_Object a = {
+ { (uint32_t)sizeof(LV2_Atom_Object_Body), forge->Blank },
+ { id, otype }
+ };
+ return lv2_atom_forge_push(
+ forge, frame, lv2_atom_forge_write(forge, &a, sizeof(a)));
+}
+
+/**
+ Write a property key in an Object, to be followed by the value.
+
+ See lv2_atom_forge_object() documentation for an example.
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_key(LV2_Atom_Forge* forge,
+ LV2_URID key)
+{
+ const LV2_Atom_Property_Body a = { key, 0, { 0, 0 } };
+ return lv2_atom_forge_write(forge, &a, 2 * (uint32_t)sizeof(uint32_t));
+}
+
+/**
+ Write the header for a property body in an object, with context.
+
+ If you do not need the context, which is almost certainly the case,
+ use the simpler lv2_atom_forge_key() instead.
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_property_head(LV2_Atom_Forge* forge,
+ LV2_URID key,
+ LV2_URID context)
+{
+ const LV2_Atom_Property_Body a = { key, context, { 0, 0 } };
+ return lv2_atom_forge_write(forge, &a, 2 * (uint32_t)sizeof(uint32_t));
+}
+
+/**
+ Write the header for a Sequence.
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_sequence_head(LV2_Atom_Forge* forge,
+ LV2_Atom_Forge_Frame* frame,
+ uint32_t unit)
+{
+ const LV2_Atom_Sequence a = {
+ { (uint32_t)sizeof(LV2_Atom_Sequence_Body), forge->Sequence },
+ { unit, 0 }
+ };
+ return lv2_atom_forge_push(
+ forge, frame, lv2_atom_forge_write(forge, &a, sizeof(a)));
+}
+
+/**
+ Write the time stamp header of an Event (in a Sequence) in audio frames.
+ After this, call the appropriate forge method(s) to write the body. Note
+ the returned reference is to an LV2_Event which is NOT an Atom.
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_frame_time(LV2_Atom_Forge* forge, int64_t frames)
+{
+ return lv2_atom_forge_write(forge, &frames, sizeof(frames));
+}
+
+/**
+ Write the time stamp header of an Event (in a Sequence) in beats. After
+ this, call the appropriate forge method(s) to write the body. Note the
+ returned reference is to an LV2_Event which is NOT an Atom.
+*/
+static inline LV2_Atom_Forge_Ref
+lv2_atom_forge_beat_time(LV2_Atom_Forge* forge, double beats)
+{
+ return lv2_atom_forge_write(forge, &beats, sizeof(beats));
+}
+
+/**
+ @}
+ @}
+*/
+
+LV2_RESTORE_WARNINGS
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* LV2_ATOM_FORGE_H */