diff options
Diffstat (limited to 'lv2/lv2plug.in/ns/ext/atom/util.h')
-rw-r--r-- | lv2/lv2plug.in/ns/ext/atom/util.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/lv2/lv2plug.in/ns/ext/atom/util.h b/lv2/lv2plug.in/ns/ext/atom/util.h index d306e1c..d7c020b 100644 --- a/lv2/lv2plug.in/ns/ext/atom/util.h +++ b/lv2/lv2plug.in/ns/ext/atom/util.h @@ -129,6 +129,52 @@ lv2_atom_sequence_next(const LV2_Atom_Event* i) /** @} + @name Sequence Utilities + @{ +*/ + +/** + Clear all events from @p sequence. + + This simply resets the size field, the other fields are left untouched. +*/ +static inline void +lv2_atom_sequence_clear(LV2_Atom_Sequence* seq) +{ + seq->atom.size = sizeof(LV2_Atom_Sequence_Body); +} + +/** + Append an event at the end of @p sequence. + + @param seq Sequence to append to. + @param capacity Total capacity of the sequence atom + (e.g. as set by the host for sequence output ports). + @param event Event to write. + + @return A pointer to the newly written event in @p seq, + or NULL on failure (insufficient space). +*/ +static inline LV2_Atom_Event* +lv2_atom_sequence_append_event(LV2_Atom_Sequence* seq, + uint32_t capacity, + const LV2_Atom_Event* event) +{ + const uint32_t total_size = (uint32_t)sizeof(*event) + event->body.size; + if (capacity - seq->atom.size < total_size) { + return NULL; + } + + LV2_Atom_Event* e = lv2_atom_sequence_end(&seq->body, seq->atom.size); + memcpy(e, event, total_size); + + seq->atom.size += lv2_atom_pad_size(total_size); + + return e; +} + +/** + @} @name Tuple Iterator @{ */ |