diff options
Diffstat (limited to 'backends/rtpmidi.h')
| -rw-r--r-- | backends/rtpmidi.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/backends/rtpmidi.h b/backends/rtpmidi.h new file mode 100644 index 0000000..9d46911 --- /dev/null +++ b/backends/rtpmidi.h @@ -0,0 +1,181 @@ +#ifndef _WIN32 +#include <sys/socket.h> +#endif +#include "midimonster.h" + +MM_PLUGIN_API int init(); +static int rtpmidi_configure(char* option, char* value); +static int rtpmidi_configure_instance(instance* instance, char* option, char* value); +static int rtpmidi_instance(instance* inst); +static channel* rtpmidi_channel(instance* instance, char* spec, uint8_t flags); +static uint32_t rtpmidi_interval(); +static int rtpmidi_set(instance* inst, size_t num, channel** c, channel_value* v); +static int rtpmidi_handle(size_t num, managed_fd* fds); +static int rtpmidi_start(size_t n, instance** inst); +static int rtpmidi_shutdown(size_t n, instance** inst); + +#define RTPMIDI_PACKET_BUFFER 8192 +#define RTPMIDI_DEFAULT_HOST "::" +#define RTPMIDI_MDNS_PORT "5353" +#define RTPMIDI_HEADER_MAGIC 0x80 +#define RTPMIDI_HEADER_TYPE 0x61 +#define RTPMIDI_GET_TYPE(a) ((a) & 0x7F) +#define RTPMIDI_DEFAULT_NAME "MIDIMonster" +#define RTPMIDI_SERVICE_INTERVAL 1000 +#define RTPMIDI_MDNS_DOMAIN "_apple-midi._udp.local." +#define RTPMIDI_DNSSD_DOMAIN "_services._dns-sd._udp.local." +#define RTPMIDI_ANNOUNCE_INTERVAL (60 * 1000) + +#define DNS_POINTER(a) (((a) & 0xC0) == 0xC0) +#define DNS_LABEL_LENGTH(a) ((a) & 0x3F) +#define DNS_OPCODE(a) (((a) & 0x78) >> 3) +#define DNS_RESPONSE(a) ((a) & 0x80) + +enum /*_rtpmidi_channel_type*/ { + none = 0, + note = 0x90, + cc = 0xB0, + pressure = 0xA0, + aftertouch = 0xD0, + pitchbend = 0xE0 +}; + +typedef enum /*_rtpmidi_instance_mode*/ { + unconfigured = 0, + direct, + apple +} rtpmidi_instance_mode; + +typedef union { + struct { + uint8_t pad[5]; + uint8_t type; + uint8_t channel; + uint8_t control; + } fields; + uint64_t label; +} rtpmidi_channel_ident; + +typedef struct /*_rtpmidi_peer*/ { + struct sockaddr_storage dest; + socklen_t dest_len; + //uint32_t ssrc; + uint8_t active; //marked for reuse + uint8_t learned; //learned / configured peer (learned peers are marked inactive on session shutdown) + uint8_t connected; //currently in active session + ssize_t invite; //invite-list index for apple-mode learned peers (used to track ipv6/ipv4 overlapping invitations) +} rtpmidi_peer; + +typedef struct /*_rtmidi_instance_data*/ { + rtpmidi_instance_mode mode; + + int fd; + int control_fd; + uint16_t control_port; /*convenience member set by rtpmidi_bind_instance*/ + + size_t peers; + rtpmidi_peer* peer; + uint32_t ssrc; + uint16_t sequence; + + //apple-midi config + char* accept; + uint64_t last_announce; + + //direct mode config + uint8_t learn_peers; +} rtpmidi_instance_data; + +typedef struct /*rtpmidi_invited_peer*/ { + instance* inst; + size_t invites; + char** name; +} rtpmidi_invite; + +typedef struct /*_rtpmidi_addr*/ { + int family; + //this is actually a fair bit too big, but whatever + uint8_t addr[sizeof(struct sockaddr_storage)]; +} rtpmidi_addr; + +typedef enum { + apple_invite = 0x494E, //IN + apple_accept = 0x4F4B, //OK + apple_reject = 0x4E4F, //NO + apple_leave = 0x4259, //BY + apple_sync = 0x434B, //CK + apple_feedback = 0x5253 //RS +} applemidi_command; + +typedef struct /*_dns_name*/ { + size_t alloc; + char* name; + size_t length; +} dns_name; + +#pragma pack(push, 1) +typedef struct /*_apple_session_command*/ { + uint16_t res1; + uint16_t command; + uint32_t version; + uint32_t token; + uint32_t ssrc; + //char* name +} apple_command; + +typedef struct /*_apple_session_sync*/ { + uint16_t res1; + uint16_t command; + uint32_t ssrc; + uint8_t count; + uint8_t res2[3]; + uint64_t timestamp[3]; +} apple_sync_frame; + +typedef struct /*_apple_session_feedback*/ { + uint16_t res1; + uint8_t command[2]; + uint32_t ssrc; + uint32_t sequence; +} apple_journal_feedback; + +typedef struct /*_rtp_midi_header*/ { + uint8_t vpxcc; + uint8_t mpt; + uint16_t sequence; + uint32_t timestamp; + uint32_t ssrc; +} rtpmidi_header; + +typedef struct /*_rtp_midi_command*/ { + uint8_t flags; + uint8_t length; +} rtpmidi_command_header; + +typedef struct /*_dns_header*/ { + uint16_t id; + uint8_t flags[2]; + uint16_t questions; + uint16_t answers; + uint16_t servers; + uint16_t additional; +} dns_header; + +typedef struct /*_dns_question*/ { + uint16_t qtype; + uint16_t qclass; +} dns_question; + +typedef struct /*_dns_rr*/ { + uint16_t rtype; + uint16_t rclass; + uint32_t ttl; + uint16_t data; +} dns_rr; + +typedef struct /*_dns_rr_srv*/ { + uint16_t priority; + uint16_t weight; + uint16_t port; +} dns_rr_srv; +#pragma pack(pop) |