LV2_MIDI | Helper functions

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lv2-midifunctions.h File Reference

This file contains static helper functions for the LV2 MIDI datatype extension. More...

#include <string.h>
#include "lv2-miditype.h"

Go to the source code of this file.

Data Structures
struct	LV2_MIDIState
	This structure contains information about a MIDI port buffer, the current period size, and the position in the MIDI data buffer that we are currently reading from or writing to. More...
Functions
static double	lv2midi_get_event (LV2_MIDIState *state, double *timestamp, uint32_t *size, unsigned char **data)
	This function reads one event from the port associated with the state parameter and writes its timestamp, size and a pointer to its data bytes into the parameters timestamp, size and data, respectively.
static double	lv2midi_step (LV2_MIDIState *state)
	This function advances the read/write position in state to the next event and returns its timestamp, or the frame_count member of state is there are no more events.
static int	lv2midi_put_event (LV2_MIDIState *state, double timestamp, uint32_t size, const unsigned char *data)
	This function writes one MIDI event to the port buffer associated with state.

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Detailed Description

This file contains static helper functions for the LV2 MIDI datatype extension.

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Function Documentation

static double lv2midi_get_event	(	LV2_MIDIState *	state,
		double *	timestamp,
		uint32_t *	size,
		unsigned char **	data
	)			[static]

This function reads one event from the port associated with the state parameter and writes its timestamp, size and a pointer to its data bytes into the parameters timestamp, size and data, respectively.

It does not advance the read position in the MIDI data buffer, two subsequent calls to lv2midi_get_event() will read the same event.

The function returns the timestamp for the read event, or the frame_count member of state if there are no more events in the buffer.

static int lv2midi_put_event	(	LV2_MIDIState *	state,
		double	timestamp,
		uint32_t	size,
		const unsigned char *	data
	)			[static]

This function writes one MIDI event to the port buffer associated with state.

It returns 0 when the event was written successfully to the buffer, and -1 when there was not enough room. The read/write position is advanced automatically.

static double lv2midi_step

(

LV2_MIDIState *

state

)

[static]

This function advances the read/write position in state to the next event and returns its timestamp, or the frame_count member of state is there are no more events.

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