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author | David Robillard <d@drobilla.net> | 2012-02-08 04:56:24 +0000 |
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committer | David Robillard <d@drobilla.net> | 2012-02-08 04:56:24 +0000 |
commit | ed78bbe5ba12be1f9bcc736f14c51da6b4f639f3 (patch) | |
tree | 653a2dfe33f3923da45a38fc04ed2106f93528f3 /lv2/lv2plug.in/ns/ext/atom/atom.h | |
parent | b617875c6f3ad439d25ae166da79df839ebfdc71 (diff) | |
download | lv2-ed78bbe5ba12be1f9bcc736f14c51da6b4f639f3.tar.xz |
Rearrange tree so top level can be used as an include path for standard style LV2 includes.
Diffstat (limited to 'lv2/lv2plug.in/ns/ext/atom/atom.h')
-rw-r--r-- | lv2/lv2plug.in/ns/ext/atom/atom.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/lv2/lv2plug.in/ns/ext/atom/atom.h b/lv2/lv2plug.in/ns/ext/atom/atom.h new file mode 100644 index 0000000..bea9197 --- /dev/null +++ b/lv2/lv2plug.in/ns/ext/atom/atom.h @@ -0,0 +1,203 @@ +/* + Copyright 2008-2012 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 atom.h C header for the LV2 Atom extension + <http://lv2plug.in/ns/ext/atom>. + + This header describes the binary layout of various types defined in the + atom extension. +*/ + +#ifndef LV2_ATOM_H +#define LV2_ATOM_H + +#define LV2_ATOM_URI "http://lv2plug.in/ns/ext/atom" + +#define LV2_ATOM_REFERENCE_TYPE 0 + +#include <stdint.h> +#include <stddef.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** This expression will fail to compile if double does not fit in 64 bits. */ +typedef char lv2_atom_assert_double_fits_in_64_bits[ + ((sizeof(double) <= sizeof(uint64_t)) * 2) - 1]; + +/** + Return a pointer to the contents of a variable-sized atom. + @param type The type of the atom, e.g. LV2_Atom_String. + @param atom A variable-sized atom. +*/ +#define LV2_ATOM_CONTENTS(type, atom) \ + ((void*)((uint8_t*)(atom) + sizeof(type))) + +/** Return a pointer to the body of @p atom (just past the LV2_Atom head). */ +#define LV2_ATOM_BODY(atom) LV2_ATOM_CONTENTS(LV2_Atom, atom) + +/** The header of an atom:Atom. */ +typedef struct { + uint32_t type; /**< Type of this atom (mapped URI). */ + uint32_t size; /**< Size in bytes, not including type and size. */ +} LV2_Atom; + +/** An atom:Int32 or atom:Bool. May be cast to LV2_Atom. */ +typedef struct { + LV2_Atom atom; + int32_t value; +} LV2_Atom_Int32; + +/** An atom:Int64. May be cast to LV2_Atom. */ +typedef struct { + LV2_Atom atom; + int64_t value; +} LV2_Atom_Int64; + +/** An atom:Float. May be cast to LV2_Atom. */ +typedef struct { + LV2_Atom atom; + float value; +} LV2_Atom_Float; + +/** An atom:Double. May be cast to LV2_Atom. */ +typedef struct { + LV2_Atom atom; + double value; +} LV2_Atom_Double; + +/** An atom:Bool. May be cast to LV2_Atom. */ +typedef LV2_Atom_Int32 LV2_Atom_Bool; + +/** An atom:URID. May be cast to LV2_Atom. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + uint32_t id; /**< URID. */ +} LV2_Atom_URID; + +/** The complete header of an atom:String. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + /* Contents (a null-terminated UTF-8 string) follow here. */ +} LV2_Atom_String; + +/** The header of an atom:Literal body. */ +typedef struct { + uint32_t datatype; /**< The ID of the datatype of this literal. */ + uint32_t lang; /**< The ID of the language of this literal. */ +} LV2_Atom_Literal_Head; + +/** The complete header of an atom:Literal. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + LV2_Atom_Literal_Head literal; /**< Literal body header. */ + /* Contents (a null-terminated UTF-8 string) follow here. */ +} LV2_Atom_Literal; + +/** The complete header of an atom:Tuple. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + /* Contents (a series of complete atoms) follow here. */ +} LV2_Atom_Tuple; + +/** The complete header of an atom:Vector. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + uint32_t elem_count; /**< The number of elements in the vector */ + uint32_t elem_type; /**< The type of each element in the vector */ + /* Contents (a series of packed atom bodies) follow here. */ +} LV2_Atom_Vector; + +/** The header of an atom:Property body (e.g. in an atom:Object). */ +typedef struct { + uint32_t key; /**< Key (predicate) (mapped URI). */ + uint32_t context; /**< Context URID (may be, and generally is, 0). */ + LV2_Atom value; /**< Value atom header. */ +} LV2_Atom_Property_Body; + +/** The complete header of an atom:Property. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + uint32_t key; /**< Key (predicate) (mapped URI). */ + uint32_t context; /**< Context URID (may be, and generally is, 0). */ + LV2_Atom value; /**< Value atom header. */ + /* Value atom body follows here. */ +} LV2_Atom_Property; + +/** The complete header of an atom:Object. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + uint32_t id; /**< URID for atom:Resource, or blank ID for atom:Blank. */ + uint32_t type; /**< Type URID (same as rdf:type, for fast dispatch). */ + /* Contents (a series of property bodies) follow here. */ +} LV2_Atom_Object; + +/** The complete header of an atom:Response. */ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + uint32_t source; /**< ID of message this is a response to (may be 0). */ + uint32_t type; /**< Specific response type URID (may be 0). */ + uint32_t seq; /**< Response sequence number, 0 for end. */ + LV2_Atom body; /**< Body atom header (may be empty). */ + /* Body optionally follows here. */ +} LV2_Atom_Response; + +/** A time stamp in frames. Note this type is NOT an LV2_Atom. */ +typedef struct { + uint32_t frames; /**< Time in frames relative to this block. */ + uint32_t subframes; /**< Fractional time in 1/(2^32)ths of a frame. */ +} LV2_Atom_Audio_Time; + +/** The header of an atom:Event. Note this type is NOT an LV2_Atom. */ +typedef struct { + /** Time stamp. Which type is valid is determined by context. */ + union { + LV2_Atom_Audio_Time audio; /**< Time in audio frames. */ + double beats; /**< Time in beats. */ + } time; + LV2_Atom body; /**< Event body atom header. */ + /* Body atom contents follow here. */ +} LV2_Atom_Event; + +/** + A sequence of events (time-stamped atoms). + + This is used as the contents of an atom:EventPort, but is a generic Atom + type which can be used anywhere. + + The contents of a sequence is a series of LV2_Atom_Event, each aligned + to 64-bits, e.g.: + <pre> + | Event 1 (size 6) | Event 2 + | | | | | | | | | + | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | + |FRAMES |SUBFRMS|TYPE |SIZE |DATADATADATAPAD|FRAMES |SUBFRMS|... + </pre> +*/ +typedef struct { + LV2_Atom atom; /**< Atom header. */ + uint32_t capacity; /**< Maximum size of contents. */ + uint32_t time_type; /**< URID type of event time stamps. */ + /* Contents (a series of events) follow here. */ +} LV2_Atom_Sequence; + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +#endif /* LV2_ATOM_H */ |