From 40a899bd6ee536eae093337bf2d0dcc8db4e46f1 Mon Sep 17 00:00:00 2001 From: Mitja Felicijan Date: Mon, 7 Oct 2024 19:30:56 +0200 Subject: Moved example code examples folder --- portmidi/pm_linux/pmlinuxalsa.c | 893 ---------------------------------------- 1 file changed, 893 deletions(-) delete mode 100755 portmidi/pm_linux/pmlinuxalsa.c (limited to 'portmidi/pm_linux/pmlinuxalsa.c') diff --git a/portmidi/pm_linux/pmlinuxalsa.c b/portmidi/pm_linux/pmlinuxalsa.c deleted file mode 100755 index b2e43e1..0000000 --- a/portmidi/pm_linux/pmlinuxalsa.c +++ /dev/null @@ -1,893 +0,0 @@ -/* - * pmlinuxalsa.c -- system specific definitions - * - * written by: - * Roger Dannenberg (port to Alsa 0.9.x) - * Clemens Ladisch (provided code examples and invaluable consulting) - * Jason Cohen, Rico Colon, Matt Filippone (Alsa 0.5.x implementation) - */ - -/* omit this code if PMALSA is not defined -- this mechanism allows - * selection of different MIDI interfaces (at compile time). - */ -#ifdef PMALSA - -#include "stdlib.h" -#include "portmidi.h" -#include "pmutil.h" -#include "pminternal.h" -#include "pmlinuxalsa.h" -#include "string.h" -#include "porttime.h" - -#include - -/* I used many print statements to debug this code. I left them in the - * source, and you can turn them on by changing false to true below: - */ -#define VERBOSE_ON 0 -#define VERBOSE if (VERBOSE_ON) - -#define MIDI_SYSEX 0xf0 -#define MIDI_EOX 0xf7 - -#if SND_LIB_MAJOR == 0 && SND_LIB_MINOR < 9 -#error needs ALSA 0.9.0 or later -#endif - -/* to store client/port in the device descriptor */ -#define MAKE_DESCRIPTOR(client, port) ((void*)(long)(((client) << 8) | (port))) -#define GET_DESCRIPTOR_CLIENT(info) ((((long)(info)) >> 8) & 0xff) -#define GET_DESCRIPTOR_PORT(info) (((long)(info)) & 0xff) - -#define BYTE unsigned char - -extern pm_fns_node pm_linuxalsa_in_dictionary; -extern pm_fns_node pm_linuxalsa_out_dictionary; - -static snd_seq_t *seq = NULL; // all input comes here, - // output queue allocated on seq -static int queue, queue_used; /* one for all ports, reference counted */ - -#define PORT_IS_CLOSED -999999 - -typedef struct alsa_info_struct { - int is_virtual; - int client; - int port; - int this_port; - int in_sysex; - snd_midi_event_t *parser; -} alsa_info_node, *alsa_info_type; - - -/* get_alsa_error_text -- copy error text to potentially short string */ -/**/ -static void get_alsa_error_text(char *msg, int len, int err) -{ - int errlen = strlen(snd_strerror(err)); - if (errlen > 0 && errlen < len) { - strcpy(msg, snd_strerror(err)); - } else if (len > 20) { - sprintf(msg, "Alsa error %d", err); - } else { - msg[0] = 0; - } -} - - -static PmError check_hosterror(int err) -{ - if (err < 0) { - get_alsa_error_text(pm_hosterror_text, PM_HOST_ERROR_MSG_LEN, err); - pm_hosterror = TRUE; - return pmHostError; - } - return pmNoError; -} - - -/* queue is shared by both input and output, reference counted */ -static PmError alsa_use_queue(void) -{ - int err = 0; - if (queue_used == 0) { - snd_seq_queue_tempo_t *tempo; - - queue = snd_seq_alloc_queue(seq); - if (queue < 0) { - return check_hosterror(queue); - } - snd_seq_queue_tempo_alloca(&tempo); - snd_seq_queue_tempo_set_tempo(tempo, 480000); - snd_seq_queue_tempo_set_ppq(tempo, 480); - err = snd_seq_set_queue_tempo(seq, queue, tempo); - if (err < 0) { - return check_hosterror(err); - } - snd_seq_start_queue(seq, queue, NULL); - snd_seq_drain_output(seq); - } - ++queue_used; - return pmNoError; -} - - -static void alsa_unuse_queue(void) -{ - if (--queue_used == 0) { - snd_seq_stop_queue(seq, queue, NULL); - snd_seq_drain_output(seq); - snd_seq_free_queue(seq, queue); - VERBOSE printf("queue freed\n"); - } -} - - -/* midi_message_length -- how many bytes in a message? */ -static int midi_message_length(PmMessage message) -{ - message &= 0xff; - if (message < 0x80) { - return 0; - } else if (message < 0xf0) { - static const int length[] = {3, 3, 3, 3, 2, 2, 3}; - return length[(message - 0x80) >> 4]; - } else { - static const int length[] = { - -1, 2, 3, 2, 0, 0, 1, -1, 1, 0, 1, 1, 1, 0, 1, 1}; - return length[message - 0xf0]; - } -} - - -static alsa_info_type alsa_info_create(int client_port, long id, int is_virtual) -{ - alsa_info_type info = (alsa_info_type) pm_alloc(sizeof(alsa_info_node)); - info->is_virtual = is_virtual; - info->this_port = id; - info->client = GET_DESCRIPTOR_CLIENT(client_port); - info->port = GET_DESCRIPTOR_PORT(client_port); - info->in_sysex = 0; - return info; -} - - -/* search system dependent extra parameters for string */ -static const char *get_sysdep_name(enum PmSysDepPropertyKey key, - PmSysDepInfo *info) -{ - /* the version where all current properties were introduced is 210 */ - if (info && info->structVersion >= 210) { - int i; - for (i = 0; i < info->length; i++) { /* search for key */ - if (info->properties[i].key == key) { - return info->properties[i].value; - } - } - } - return NULL; -} - - -static void maybe_set_client_name(PmSysDepInfo *driverInfo) -{ - if (!seq) { // make sure seq is created and we have info - return; - } - - const char *client_name = get_sysdep_name(pmKeyAlsaClientName, - (PmSysDepInfo *) driverInfo); - if (client_name) { - snd_seq_set_client_name(seq, client_name); - printf("maybe_set_client_name set client to %s\n", client_name); - } -} - - -static PmError alsa_out_open(PmInternal *midi, void *driverInfo) -{ - int id = midi->device_id; - void *client_port = pm_descriptors[id].descriptor; - alsa_info_type ainfo = alsa_info_create((long) client_port, id, - pm_descriptors[id].pub.is_virtual); - snd_seq_port_info_t *pinfo; - int err = 0; - int using_the_queue = 0; - - if (!ainfo) return pmInsufficientMemory; - midi->api_info = ainfo; - - snd_seq_port_info_alloca(&pinfo); - if (!ainfo->is_virtual) { - snd_seq_port_info_set_port(pinfo, id); - snd_seq_port_info_set_capability(pinfo, SND_SEQ_PORT_CAP_WRITE | - SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ); - snd_seq_port_info_set_type(pinfo, SND_SEQ_PORT_TYPE_MIDI_GENERIC | - SND_SEQ_PORT_TYPE_APPLICATION); - const char *port_name = get_sysdep_name(pmKeyAlsaPortName, - (PmSysDepInfo *) driverInfo); - if (port_name) { - snd_seq_port_info_set_name(pinfo, port_name); - } - snd_seq_port_info_set_port_specified(pinfo, 1); - - err = snd_seq_create_port(seq, pinfo); - if (err < 0) goto free_ainfo; - - } - - err = snd_midi_event_new(PM_DEFAULT_SYSEX_BUFFER_SIZE, &ainfo->parser); - if (err < 0) goto free_this_port; - - if (midi->latency > 0) { /* must delay output using a queue */ - err = alsa_use_queue(); - if (err < 0) goto free_parser; - using_the_queue++; - } - - if (!ainfo->is_virtual) { - err = snd_seq_connect_to(seq, ainfo->this_port, ainfo->client, - ainfo->port); - if (err < 0) goto unuse_queue; /* clean up and return on error */ - } - - maybe_set_client_name(driverInfo); - - return pmNoError; - - unuse_queue: - if (using_the_queue > 0) /* only for latency>0 case */ - alsa_unuse_queue(); - free_parser: - snd_midi_event_free(ainfo->parser); - free_this_port: - snd_seq_delete_port(seq, ainfo->this_port); - free_ainfo: - pm_free(ainfo); - return check_hosterror(err); -} - - -static PmError alsa_write_byte(PmInternal *midi, unsigned char byte, - PmTimestamp timestamp) -{ - alsa_info_type info = (alsa_info_type) midi->api_info; - snd_seq_event_t ev; - int err = 0; - - snd_seq_ev_clear(&ev); - if (snd_midi_event_encode_byte(info->parser, byte, &ev) == 1) { - if (info->is_virtual) { - snd_seq_ev_set_subs(&ev); - } else { - snd_seq_ev_set_dest(&ev, info->client, info->port); - } - snd_seq_ev_set_source(&ev, info->this_port); - if (midi->latency > 0) { - /* compute relative time of event = timestamp - now + latency */ - PmTimestamp now = (midi->time_proc ? - midi->time_proc(midi->time_info) : - Pt_Time()); - int when = timestamp; - /* if timestamp is zero, send immediately */ - /* otherwise compute time delay and use delay if positive */ - if (when == 0) when = now; - when = (when - now) + midi->latency; - if (when < 0) when = 0; - VERBOSE printf("timestamp %d now %d latency %d, ", - (int) timestamp, (int) now, midi->latency); - VERBOSE printf("scheduling event after %d\n", when); - /* message is sent in relative ticks, where 1 tick = 1 ms */ - snd_seq_ev_schedule_tick(&ev, queue, 1, when); - /* NOTE: for cases where the user does not supply a time function, - we could optimize the code by not starting Pt_Time and using - the alsa tick time instead. I didn't do this because it would - entail changing the queue management to start the queue tick - count when PortMidi is initialized and keep it running until - PortMidi is terminated. (This should be simple, but it's not - how the code works now.) -RBD */ - } else { /* send event out without queueing */ - VERBOSE printf("direct\n"); - /* ev.queue = SND_SEQ_QUEUE_DIRECT; - ev.dest.client = SND_SEQ_ADDRESS_SUBSCRIBERS; */ - snd_seq_ev_set_direct(&ev); - } - VERBOSE printf("sending event, timestamp %d (%d+%dns) (%s, %s)\n", - ev.time.tick, ev.time.time.tv_sec, ev.time.time.tv_nsec, - (ev.flags & SND_SEQ_TIME_STAMP_MASK ? "real" : "tick"), - (ev.flags & SND_SEQ_TIME_MODE_MASK ? "rel" : "abs")); - err = snd_seq_event_output(seq, &ev); - } - return check_hosterror(err); -} - - -static PmError alsa_out_close(PmInternal *midi) -{ - alsa_info_type info = (alsa_info_type) midi->api_info; - int err = 0; - int error2 = 0; - if (!info) return pmBadPtr; - - if (info->this_port != PORT_IS_CLOSED) { - if (!info->is_virtual) { - err = snd_seq_disconnect_to(seq, info->this_port, - info->client, info->port); - /* even if there was an error, we still try to delete the port */ - error2 = snd_seq_delete_port(seq, info->this_port); - - if (!err) { /* retain original error if there was one */ - err = error2; /* otherwise, use port delete status */ - } - } - } - if (midi->latency > 0) alsa_unuse_queue(); - snd_midi_event_free(info->parser); - midi->api_info = NULL; /* destroy the pointer to signify "closed" */ - pm_free(info); - return check_hosterror(err); -} - - -static PmError alsa_create_virtual(int is_input, const char *name, - void *device_info) -{ - snd_seq_port_info_t *pinfo; - int err; - int client, port; - - /* we need the id to set the port. */ - PmDeviceID id = pm_add_device("ALSA", name, is_input, TRUE, NULL, - (is_input ? &pm_linuxalsa_in_dictionary : - &pm_linuxalsa_out_dictionary)); - if (id < 0) { /* error -- out of memory? */ - return id; - } - snd_seq_port_info_alloca(&pinfo); - snd_seq_port_info_set_capability(pinfo, - (is_input ? SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE : - SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ)); - snd_seq_port_info_set_type(pinfo, SND_SEQ_PORT_TYPE_MIDI_GENERIC | - SND_SEQ_PORT_TYPE_APPLICATION); - snd_seq_port_info_set_name(pinfo, name); - snd_seq_port_info_set_port(pinfo, id); - snd_seq_port_info_set_port_specified(pinfo, 1); - /* next 3 lines needed to generate timestamp - PaulLiu */ - snd_seq_port_info_set_timestamping(pinfo, 1); - snd_seq_port_info_set_timestamp_real(pinfo, 0); - snd_seq_port_info_set_timestamp_queue(pinfo, queue); - - err = snd_seq_create_port(seq, pinfo); - if (err < 0) { - pm_undo_add_device(id); - return check_hosterror(err); - } - - client = snd_seq_port_info_get_client(pinfo); - port = snd_seq_port_info_get_port(pinfo); - pm_descriptors[id].descriptor = MAKE_DESCRIPTOR(client, port); - return id; -} - - - static PmError alsa_delete_virtual(PmDeviceID id) - { - int err = snd_seq_delete_port(seq, id); - return check_hosterror(err); - } - - -static PmError alsa_in_open(PmInternal *midi, void *driverInfo) -{ - int id = midi->device_id; - void *client_port = pm_descriptors[id].descriptor; - alsa_info_type ainfo = alsa_info_create((long) client_port, id, - pm_descriptors[id].pub.is_virtual); - snd_seq_port_info_t *pinfo; - snd_seq_port_subscribe_t *sub; - snd_seq_addr_t addr; - int err = 0; - int is_virtual = pm_descriptors[id].pub.is_virtual; - - if (!ainfo) return pmInsufficientMemory; - midi->api_info = ainfo; - - err = alsa_use_queue(); - if (err < 0) goto free_ainfo; - - snd_seq_port_info_alloca(&pinfo); - if (is_virtual) { - ainfo->is_virtual = TRUE; - if (snd_seq_get_port_info(seq, ainfo->port, pinfo)) { - pinfo = NULL; - goto free_ainfo; - } - } else { - /* create a port for this alsa client (seq) where the port - number matches the portmidi device ID of the input device */ - snd_seq_port_info_set_port(pinfo, id); - snd_seq_port_info_set_capability(pinfo, SND_SEQ_PORT_CAP_WRITE | - SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_WRITE); - - snd_seq_port_info_set_type(pinfo, SND_SEQ_PORT_TYPE_MIDI_GENERIC | - SND_SEQ_PORT_TYPE_APPLICATION); - snd_seq_port_info_set_port_specified(pinfo, 1); - - const char *port_name = get_sysdep_name(pmKeyAlsaPortName, - (PmSysDepInfo *) driverInfo); - if (port_name) { - snd_seq_port_info_set_name(pinfo, port_name); - } - - err = snd_seq_create_port(seq, pinfo); - if (err < 0) goto free_queue; - - /* forward messages from input to this alsa client, so this - * alsa client is the destination, and the destination port is the - * port we just created using the device ID as port number - */ - snd_seq_port_subscribe_alloca(&sub); - addr.client = snd_seq_client_id(seq); - addr.port = ainfo->this_port; - snd_seq_port_subscribe_set_dest(sub, &addr); - - /* forward from the sender which is the device named by - client and port */ - addr.client = ainfo->client; - addr.port = ainfo->port; - snd_seq_port_subscribe_set_sender(sub, &addr); - snd_seq_port_subscribe_set_time_update(sub, 1); - /* this doesn't seem to work: messages come in with real timestamps */ - snd_seq_port_subscribe_set_time_real(sub, 0); - err = snd_seq_subscribe_port(seq, sub); - if (err < 0) goto free_this_port; /* clean up and return on error */ - } - - maybe_set_client_name(driverInfo); - - return pmNoError; - free_this_port: - snd_seq_delete_port(seq, ainfo->this_port); - free_queue: - alsa_unuse_queue(); - free_ainfo: - pm_free(ainfo); - return check_hosterror(err); -} - -static PmError alsa_in_close(PmInternal *midi) -{ - int err = 0; - alsa_info_type info = (alsa_info_type) midi->api_info; - if (!info) return pmBadPtr; - /* virtual ports stay open because the represent devices */ - if (!info->is_virtual && info->this_port != PORT_IS_CLOSED) { - err = snd_seq_delete_port(seq, info->this_port); - } - alsa_unuse_queue(); - midi->api_info = NULL; - pm_free(info); - return check_hosterror(err); -} - - -static PmError alsa_abort(PmInternal *midi) -{ - /* NOTE: ALSA documentation is vague. This is supposed to - * remove any pending output messages. If you can test and - * confirm this code is correct, please update this comment. -RBD - */ - /* Unfortunately, I can't even compile it -- my ALSA version - * does not implement snd_seq_remove_events_t, so this does - * not compile. I'll try again, but it looks like I'll need to - * upgrade my entire Linux OS -RBD - */ - /* - info_type info = (info_type) midi->api_info; - snd_seq_remove_events_t info; - snd_seq_addr_t addr; - addr.client = info->client; - addr.port = info->port; - snd_seq_remove_events_set_dest(&info, &addr); - snd_seq_remove_events_set_condition(&info, SND_SEQ_REMOVE_DEST); - pm_hosterror = snd_seq_remove_events(seq, &info); - if (pm_hosterror) { - get_alsa_error_text(pm_hosterror_text, PM_HOST_ERROR_MSG_LEN, - pm_hosterror); - return pmHostError; - } - */ - printf("WARNING: alsa_abort not implemented\n"); - return pmNoError; -} - - -static PmError alsa_write_flush(PmInternal *midi, PmTimestamp timestamp) -{ - int err; - alsa_info_type info = (alsa_info_type) midi->api_info; - if (!info) return pmBadPtr; - VERBOSE printf("snd_seq_drain_output: %p\n", seq); - err = snd_seq_drain_output(seq); - return check_hosterror(err); -} - - -static PmError alsa_write_short(PmInternal *midi, PmEvent *event) -{ - int bytes = midi_message_length(event->message); - PmMessage msg = event->message; - int i; - alsa_info_type info = (alsa_info_type) midi->api_info; - if (!info) return pmBadPtr; - for (i = 0; i < bytes; i++) { - unsigned char byte = msg; - VERBOSE printf("sending 0x%x\n", byte); - alsa_write_byte(midi, byte, event->timestamp); - if (pm_hosterror) break; - msg >>= 8; /* shift next byte into position */ - } - if (pm_hosterror) return pmHostError; - return pmNoError; -} - - -/* alsa_sysex -- implements begin_sysex and end_sysex */ -PmError alsa_sysex(PmInternal *midi, PmTimestamp timestamp) { - return pmNoError; -} - - -static PmTimestamp alsa_synchronize(PmInternal *midi) -{ - return 0; /* linux implementation does not use this synchronize function */ - /* Apparently, Alsa data is relative to the time you send it, and there - is no reference. If this is true, this is a serious shortcoming of - Alsa. If not true, then PortMidi has a serious shortcoming -- it - should be scheduling relative to Alsa's time reference. */ -} - - -static void handle_event(snd_seq_event_t *ev) -{ - int device_id = ev->dest.port; - PmInternal *midi = pm_descriptors[device_id].pm_internal; - // There is a race condition when closing a device and - // continuing to poll other open devices. The closed device may - // have outstanding events from before the close operation. - if (!midi) { - return; - } - PmEvent pm_ev; - PmTimestamp timestamp = midi->time_proc(midi->time_info); - - /* time stamp should be in ticks, using our queue where 1 tick = 1ms */ - /* assert((ev->flags & SND_SEQ_TIME_STAMP_MASK) == SND_SEQ_TIME_STAMP_TICK); - * Currently, event timestamp is ignored. See long note below. */ - - VERBOSE { - /* translate time to time_proc basis */ - snd_seq_queue_status_t *queue_status; - snd_seq_queue_status_alloca(&queue_status); - snd_seq_get_queue_status(seq, queue, queue_status); - printf("handle_event: alsa_now %d, " - "event timestamp %d (%d+%dns) (%s, %s)\n", - snd_seq_queue_status_get_tick_time(queue_status), - ev->time.tick, ev->time.time.tv_sec, ev->time.time.tv_nsec, - (ev->flags & SND_SEQ_TIME_STAMP_MASK ? "real" : "tick"), - (ev->flags & SND_SEQ_TIME_MODE_MASK ? "rel" : "abs")); - /* OLD: portmidi timestamp is (now - alsa_now) + alsa_timestamp */ - /* timestamp = (*time_proc)(midi->time_info) + ev->time.tick - - snd_seq_queue_status_get_tick_time(queue_status); */ - } - /* CURRENT: portmidi timestamp is "now". In a test, timestamps from - * hardware (MIDI over USB) were timestamped with the current ALSA - * time (snd_seq_queue_status_get_tick_time) and flags indicating - * absolute ticks, but timestamps from another application's virtual - * port, sent direct with 0 absolute ticks, were received with a - * large value that is apparently the time since the start time of - * the other application. Without any reference to our local time, - * this seems useless. PortMidi is supposed to return the local - * PortMidi time of the arrival of the message, so the best we can - * do is set the timestamp to our local clock. This seems to be a - * design flaw in ALSA -- I pointed this out a decade ago, but if - * there is a workaround, I'd still like to know. Maybe there is a - * way to use absolute real time and maybe that's sharable across - * applications by referencing the system time? - */ - pm_ev.timestamp = timestamp; - switch (ev->type) { - case SND_SEQ_EVENT_NOTEON: - pm_ev.message = Pm_Message(0x90 | ev->data.note.channel, - ev->data.note.note & 0x7f, - ev->data.note.velocity & 0x7f); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_NOTEOFF: - pm_ev.message = Pm_Message(0x80 | ev->data.note.channel, - ev->data.note.note & 0x7f, - ev->data.note.velocity & 0x7f); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_KEYPRESS: - pm_ev.message = Pm_Message(0xa0 | ev->data.note.channel, - ev->data.note.note & 0x7f, - ev->data.note.velocity & 0x7f); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_CONTROLLER: - pm_ev.message = Pm_Message(0xb0 | ev->data.note.channel, - ev->data.control.param & 0x7f, - ev->data.control.value & 0x7f); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_PGMCHANGE: - pm_ev.message = Pm_Message(0xc0 | ev->data.note.channel, - ev->data.control.value & 0x7f, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_CHANPRESS: - pm_ev.message = Pm_Message(0xd0 | ev->data.note.channel, - ev->data.control.value & 0x7f, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_PITCHBEND: - pm_ev.message = Pm_Message(0xe0 | ev->data.note.channel, - (ev->data.control.value + 0x2000) & 0x7f, - ((ev->data.control.value + 0x2000) >> 7) & 0x7f); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_CONTROL14: - if (ev->data.control.param < 0x20) { - pm_ev.message = Pm_Message(0xb0 | ev->data.note.channel, - ev->data.control.param, - (ev->data.control.value >> 7) & 0x7f); - pm_read_short(midi, &pm_ev); - pm_ev.message = Pm_Message(0xb0 | ev->data.note.channel, - ev->data.control.param + 0x20, - ev->data.control.value & 0x7f); - pm_read_short(midi, &pm_ev); - } else { - pm_ev.message = Pm_Message(0xb0 | ev->data.note.channel, - ev->data.control.param & 0x7f, - ev->data.control.value & 0x7f); - - pm_read_short(midi, &pm_ev); - } - break; - case SND_SEQ_EVENT_SONGPOS: - pm_ev.message = Pm_Message(0xf2, - ev->data.control.value & 0x7f, - (ev->data.control.value >> 7) & 0x7f); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_SONGSEL: - pm_ev.message = Pm_Message(0xf3, - ev->data.control.value & 0x7f, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_QFRAME: - pm_ev.message = Pm_Message(0xf1, - ev->data.control.value & 0x7f, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_START: - pm_ev.message = Pm_Message(0xfa, 0, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_CONTINUE: - pm_ev.message = Pm_Message(0xfb, 0, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_STOP: - pm_ev.message = Pm_Message(0xfc, 0, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_CLOCK: - pm_ev.message = Pm_Message(0xf8, 0, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_TUNE_REQUEST: - pm_ev.message = Pm_Message(0xf6, 0, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_RESET: - pm_ev.message = Pm_Message(0xff, 0, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_SENSING: - pm_ev.message = Pm_Message(0xfe, 0, 0); - pm_read_short(midi, &pm_ev); - break; - case SND_SEQ_EVENT_SYSEX: { - const BYTE *ptr = (const BYTE *) ev->data.ext.ptr; - /* assume there is one sysex byte to process */ - pm_read_bytes(midi, ptr, ev->data.ext.len, timestamp); - break; - } - case SND_SEQ_EVENT_PORT_UNSUBSCRIBED: { - /* this happens if you have an input port open and the - * device or application with virtual ports closes. We - * mark the port as closed to avoid closing a 2nd time - * when Pm_Close() is called. - */ - alsa_info_type info = (alsa_info_type) midi->api_info; - /* printf("SND_SEQ_EVENT_UNSUBSCRIBE message\n"); */ - info->this_port = PORT_IS_CLOSED; - break; - } - case SND_SEQ_EVENT_PORT_SUBSCRIBED: - break; /* someone connected to a virtual output port, not reported */ - default: - printf("portmidi handle_event: not handled type %x\n", ev->type); - break; - } -} - - -static PmError alsa_poll(PmInternal *midi) -{ - if (!midi) { - return pmBadPtr; - } - snd_seq_event_t *ev; - /* expensive check for input data, gets data from device: */ - while (snd_seq_event_input_pending(seq, TRUE) > 0) { - /* cheap check on local input buffer */ - while (snd_seq_event_input_pending(seq, FALSE) > 0) { - /* check for and ignore errors, e.g. input overflow */ - /* note: if there's overflow, this should be reported - * all the way through to client. Since input from all - * devices is merged, we need to find all input devices - * and set all to the overflow state. - * NOTE: this assumes every input is ALSA based. - */ - int rslt = snd_seq_event_input(seq, &ev); - if (rslt >= 0) { - handle_event(ev); - } else if (rslt == -ENOSPC) { - int i; - for (i = 0; i < pm_descriptor_len; i++) { - if (pm_descriptors[i].pub.input) { - PmInternal *midi_i = pm_descriptors[i].pm_internal; - /* careful, device may not be open! */ - if (midi_i) Pm_SetOverflow(midi_i->queue); - } - } - } - } - } - return pmNoError; -} - - -static unsigned int alsa_check_host_error(PmInternal *midi) -{ - return FALSE; -} - - -pm_fns_node pm_linuxalsa_in_dictionary = { - none_write_short, - none_sysex, - none_sysex, - none_write_byte, - none_write_short, - none_write_flush, - alsa_synchronize, - alsa_in_open, - alsa_abort, - alsa_in_close, - alsa_poll, - alsa_check_host_error -}; - -pm_fns_node pm_linuxalsa_out_dictionary = { - alsa_write_short, - alsa_sysex, - alsa_sysex, - alsa_write_byte, - alsa_write_short, /* short realtime message */ - alsa_write_flush, - alsa_synchronize, - alsa_out_open, - alsa_abort, - alsa_out_close, - none_poll, - alsa_check_host_error -}; - - -/* pm_strdup -- copy a string to the heap. Use this rather than strdup so - * that we call pm_alloc, not malloc. This allows portmidi to avoid - * malloc which might cause priority inversion. Probably ALSA is going - * to call malloc anyway, so this extra work here may be pointless. - */ -char *pm_strdup(const char *s) -{ - int len = strlen(s); - char *dup = (char *) pm_alloc(len + 1); - strcpy(dup, s); - return dup; -} - - -PmError pm_linuxalsa_init(void) -{ - int err; - snd_seq_client_info_t *cinfo; - snd_seq_port_info_t *pinfo; - unsigned int caps; - - /* Register interface ALSA with create_virtual fn */ - pm_add_interf("ALSA", &alsa_create_virtual, &alsa_delete_virtual); - - /* Previously, the last parameter was SND_SEQ_NONBLOCK, but this - * would cause messages to be dropped if the ALSA buffer fills up. - * The correct behavior is for writes to block until there is - * room to send all the data. The client should normally allocate - * a large enough buffer to avoid blocking on output. - * Now that blocking is enabled, the seq_event_input() will block - * if there is no input data. This is not what we want, so must - * call seq_event_input_pending() to avoid blocking. - */ - err = snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, 0); - if (err < 0) goto error_return; - - snd_seq_client_info_alloca(&cinfo); - snd_seq_port_info_alloca(&pinfo); - - snd_seq_client_info_set_client(cinfo, -1); - while (snd_seq_query_next_client(seq, cinfo) == 0) { - snd_seq_port_info_set_client(pinfo, - snd_seq_client_info_get_client(cinfo)); - snd_seq_port_info_set_port(pinfo, -1); - while (snd_seq_query_next_port(seq, pinfo) == 0) { - if (snd_seq_port_info_get_client(pinfo) == SND_SEQ_CLIENT_SYSTEM) - continue; /* ignore Timer and Announce ports on client 0 */ - caps = snd_seq_port_info_get_capability(pinfo); - if (!(caps & (SND_SEQ_PORT_CAP_SUBS_READ | - SND_SEQ_PORT_CAP_SUBS_WRITE))) - continue; /* ignore if you cannot read or write port */ - if (caps & SND_SEQ_PORT_CAP_SUBS_WRITE) { - if (pm_default_output_device_id == -1) - pm_default_output_device_id = pm_descriptor_len; - pm_add_device("ALSA", - pm_strdup(snd_seq_port_info_get_name(pinfo)), - FALSE, FALSE, - MAKE_DESCRIPTOR(snd_seq_port_info_get_client(pinfo), - snd_seq_port_info_get_port(pinfo)), - &pm_linuxalsa_out_dictionary); - } - if (caps & SND_SEQ_PORT_CAP_SUBS_READ) { - if (pm_default_input_device_id == -1) - pm_default_input_device_id = pm_descriptor_len; - pm_add_device("ALSA", - pm_strdup(snd_seq_port_info_get_name(pinfo)), - TRUE, FALSE, - MAKE_DESCRIPTOR(snd_seq_port_info_get_client(pinfo), - snd_seq_port_info_get_port(pinfo)), - &pm_linuxalsa_in_dictionary); - } - } - } - return pmNoError; - error_return: - pm_linuxalsa_term(); /* clean up */ - return check_hosterror(err); -} - - -void pm_linuxalsa_term(void) -{ - if (seq) { - snd_seq_close(seq); - pm_free(pm_descriptors); - pm_descriptors = NULL; - pm_descriptor_len = 0; - pm_descriptor_max = 0; - } -} - -#endif -- cgit v1.2.3