119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/* ++++++++++
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FILE: midi_driver.h
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REVS: $Revision: 1.1 $
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NAME: herold
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DATE: Tue Jun 4 15:23:29 PDT 1996
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Interface to /dev/midi, the midi driver
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+++++ */
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/*
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Copyright 1999, Be Incorporated. All Rights Reserved.
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This file may be used under the terms of the Be Sample Code License.
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*/
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#ifndef _MIDI_DRIVER_H
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#define _MIDI_DRIVER_H
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#include <Drivers.h>
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#include <module.h>
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/* -----
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ioctl codes
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----- */
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/* the old opcodes are deprecated, and may or may not work
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in newer drivers */
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enum {
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B_MIDI_GET_READ_TIMEOUT = B_MIDI_DRIVER_BASE,
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B_MIDI_SET_READ_TIMEOUT,
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B_MIDI_TIMED_READ,
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B_MIDI_TIMED_WRITE,
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B_MIDI_WRITE_SYNC,
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B_MIDI_WRITE_CLEAR,
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B_MIDI_GET_READ_TIMEOUT_OLD = B_DEVICE_OP_CODES_END + 1,
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B_MIDI_SET_READ_TIMEOUT_OLD
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};
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/* the default timeout when you open a midi driver */
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#define B_MIDI_DEFAULT_TIMEOUT 1000000000000000LL
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/* Usage:
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To read, set "data" to a pointer to your buffer, and "size" to the
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maximum size of this buffer. On return, "when" will contain the time
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at which the data was received (first byte) and "size" will contain
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the actual amount of data read.
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Call ioctl(fd, B_MIDI_TIMED_READ, &midi_timed_data, sizeof(midi_timed_data));
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To write, set "when" to when you want the first byte to go out the
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wire, set "data" to point to your data, and set "size" to the size
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of your data.
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Call ioctl(fd, B_MIDI_TIMED_WRITE, &midi_timed_data, sizeof(midi_timed_data));
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*/
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typedef struct {
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bigtime_t when;
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size_t size;
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unsigned char * data;
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} midi_timed_data;
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/* The MIDI parser returns the number of bytes that a message contains, given the */
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/* initial byte. For some messages, this is not known until the second byte is seen. */
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/* For such messages, a state > 0 is returned as well as some count > 0. When state */
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/* is > 0, you should call (*parse) for the next byte as well, which might modify */
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/* the returned message size. Message size will always be returned with the current */
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/* byte being counted as byte 1. A return of 0 means that the byte initiates a new */
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/* message. SysX is handled by returning max_size until the end or next initial message */
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/* is seen. So your loop looks something like: */
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/*
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uint32 state = 0; // Only set this to 0 the first time you call the parser.
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// preserve the 'state' between invocations of your read() hook.
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int todo = 0;
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unsigned char * end = in_buf+buf_size
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unsigned char * out_buf = in_buf;
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while (true) {
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uchar byte = read_midi();
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if (!todo || state) {
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todo = (*parser->parse)(&state, byte, end-out_buf);
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}
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if (todo < 1) {
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unput_midi(byte);
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} else {
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*(out_buf++) = byte;
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todo--;
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}
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if (todo < 1 || out_buf >= end) {
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received_midi_message(in_buf, out_buf-in_buf);
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todo = 0;
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}
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}
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*/
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#define B_MIDI_PARSER_MODULE_NAME "media/midiparser/v1"
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typedef struct _midi_parser_module_info {
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module_info minfo;
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int (*parse)(uint32 * state, uchar byte, size_t max_size);
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int _reserved_;
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} midi_parser_module_info;
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#define B_MPU_401_MODULE_NAME "generic/mpu401/v1"
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enum {
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B_MPU_401_ENABLE_CARD_INT = 1,
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B_MPU_401_DISABLE_CARD_INT
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};
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typedef struct _generic_mpu401_module {
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module_info minfo;
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status_t (*create_device)(int port, void ** out_storage, uint32 workarounds, void (*interrupt_op)(int32 op, void * card), void * card);
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status_t (*delete_device)(void * storage);
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status_t (*open_hook)(void * storage, uint32 flags, void ** out_cookie);
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status_t (*close_hook)(void * cookie);
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status_t (*free_hook)(void * cookie);
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status_t (*control_hook)(void * cookie, uint32 op, void * data, size_t len);
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status_t (*read_hook)(void * cookie, off_t pos, void * data, size_t * len);
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status_t (*write_hook)(void * cookie, off_t pos, const void * data, size_t * len);
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bool (*interrupt_hook)(void * cookie);
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int _reserved_;
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} generic_mpu401_module;
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#endif
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