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bluez5: implement BLE midi data writer

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This commit is contained in:
Pauli Virtanen 2022-11-04 20:58:56 +02:00 • committed by Wim Taymans
parent e3cf7f6d87
commit 5d6f25e8f0
2 changed files with 135 additions and 1 deletions
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46
spa/plugins/bluez5/midi.h
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@ -42,7 +42,11 @@
#define BT_MIDI_SERVICE_UUID "03b80e5a-ede8-4b33-a751-6ce34ec4c700"
#define BT_MIDI_CHR_UUID "7772e5db-3868-4112-a1a9-f2669d106bf3"
#define MIDI_BUF_SIZE 8192
#define MIDI_BUF_SIZE 8192
#define MIDI_MAX_MTU 8192
#define MIDI_CLOCK_PERIOD_MSEC 0x2000
#define MIDI_CLOCK_PERIOD_NSEC (MIDI_CLOCK_PERIOD_MSEC * SPA_NSEC_PER_MSEC)
struct spa_bt_midi_parser {
unsigned int size;
@ -50,6 +54,16 @@ struct spa_bt_midi_parser {
uint8_t buf[MIDI_BUF_SIZE];
};
struct spa_bt_midi_writer {
unsigned int size;
unsigned int mtu;
unsigned int pos;
uint8_t running_status;
uint64_t running_time_msec;
unsigned int flush:1;
uint8_t buf[MIDI_MAX_MTU];
};
static inline void spa_bt_midi_parser_init(struct spa_bt_midi_parser *parser)
{
parser->size = 0;
@ -73,4 +87,34 @@ int spa_bt_midi_parser_parse(struct spa_bt_midi_parser *parser,
void (*event)(void *user_data, uint16_t time, uint8_t *event, size_t event_size),
void *user_data);
static inline void spa_bt_midi_writer_init(struct spa_bt_midi_writer *writer, unsigned int mtu)
{
writer->size = 0;
writer->mtu = SPA_MIN(mtu, (unsigned int)MIDI_MAX_MTU);
writer->pos = 0;
writer->running_status = 0;
writer->running_time_msec = 0;
writer->flush = 0;
}
/**
* Add a new event to midi writer buffer.
*
* spa_bt_midi_writer_init(&writer, mtu);
* for (time, event, size) in midi events {
* do {
* res = spa_bt_midi_writer_write(&writer, time, event, size);
* if (res < 0) {
* fail with error
* } else if (res) {
* send_packet(writer->buf, writer->size);
* }
* } while (res);
* }
* if (writer.size > 0)
* send_packet(writer->buf, writer->size);
*/
int spa_bt_midi_writer_write(struct spa_bt_midi_writer *writer,
uint64_t time, const uint8_t *event, size_t event_size);
#endif