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Diffstat (limited to 'src/lib/portmidi/pmlinuxalsa.c')
-rw-r--r--src/lib/portmidi/pmlinuxalsa.c783
1 files changed, 0 insertions, 783 deletions
diff --git a/src/lib/portmidi/pmlinuxalsa.c b/src/lib/portmidi/pmlinuxalsa.c
deleted file mode 100644
index fa65fdae18f..00000000000
--- a/src/lib/portmidi/pmlinuxalsa.c
+++ /dev/null
@@ -1,783 +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)
- */
-
-#include "stdlib.h"
-#include "portmidi.h"
-#include "pmutil.h"
-#include "pminternal.h"
-#include "pmlinuxalsa.h"
-#include "string.h"
-#include "porttime.h"
-#include "pmlinux.h"
-#include "osdcomm.h"
-
-#include <alsa/asoundlib.h>
-
-/* 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*)(FPTR)(((client) << 8) | (port)))
-#define GET_DESCRIPTOR_CLIENT(info) ((((int)(FPTR)(info)) >> 8) & 0xff)
-#define GET_DESCRIPTOR_PORT(info) (((int)(FPTR)(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 */
-
-typedef struct alsa_descriptor_struct {
- int client;
- int port;
- int this_port;
- int in_sysex;
- snd_midi_event_t *parser;
- int error; /* host error code */
-} alsa_descriptor_node, *alsa_descriptor_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 < len) {
- strcpy(msg, snd_strerror(err));
- } else if (len > 20) {
- sprintf(msg, "Alsa error %d", err);
- } else if (len > 4) {
- strcpy(msg, "Alsa");
- } else {
- msg[0] = 0;
- }
-}
-
-
-/* queue is shared by both input and output, reference counted */
-static PmError alsa_use_queue(void)
-{
- if (queue_used == 0) {
- snd_seq_queue_tempo_t *tempo;
-
- queue = snd_seq_alloc_queue(seq);
- if (queue < 0) {
- pm_hosterror = queue;
- return pmHostError;
- }
- snd_seq_queue_tempo_alloca(&tempo);
- snd_seq_queue_tempo_set_tempo(tempo, 480000);
- snd_seq_queue_tempo_set_ppq(tempo, 480);
- pm_hosterror = snd_seq_set_queue_tempo(seq, queue, tempo);
- if (pm_hosterror < 0)
- return pmHostError;
-
- 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 PmError alsa_out_open(PmInternal *midi, void *driverInfo)
-{
- void *client_port = descriptors[midi->device_id].descriptor;
- alsa_descriptor_type desc = (alsa_descriptor_type)
- pm_alloc(sizeof(alsa_descriptor_node));
- snd_seq_port_info_t *info;
- int err;
-
- if (!desc) return pmInsufficientMemory;
-
- snd_seq_port_info_alloca(&info);
- snd_seq_port_info_set_port(info, midi->device_id);
- snd_seq_port_info_set_capability(info, SND_SEQ_PORT_CAP_WRITE |
- SND_SEQ_PORT_CAP_READ);
- snd_seq_port_info_set_type(info, SND_SEQ_PORT_TYPE_MIDI_GENERIC |
- SND_SEQ_PORT_TYPE_APPLICATION);
- snd_seq_port_info_set_port_specified(info, 1);
- err = snd_seq_create_port(seq, info);
- if (err < 0) goto free_desc;
-
- /* fill in fields of desc, which is passed to pm_write routines */
- midi->descriptor = desc;
- desc->client = GET_DESCRIPTOR_CLIENT(client_port);
- desc->port = GET_DESCRIPTOR_PORT(client_port);
- desc->this_port = midi->device_id;
- desc->in_sysex = 0;
-
- desc->error = 0;
-
- err = snd_midi_event_new(PM_DEFAULT_SYSEX_BUFFER_SIZE, &desc->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;
-
- err = snd_seq_connect_to(seq, desc->this_port, desc->client, desc->port);
- if (err < 0) goto unuse_queue; /* clean up and return on error */
- } else {
- err = snd_seq_connect_to(seq, desc->this_port, desc->client, desc->port);
- if (err < 0) goto free_parser; /* clean up and return on error */
- }
- return pmNoError;
-
- unuse_queue:
- alsa_unuse_queue();
- free_parser:
- snd_midi_event_free(desc->parser);
- free_this_port:
- snd_seq_delete_port(seq, desc->this_port);
- free_desc:
- pm_free(desc);
- pm_hosterror = err;
- if (err < 0) {
- get_alsa_error_text(pm_hosterror_text, PM_HOST_ERROR_MSG_LEN, err);
- }
- return pmHostError;
-}
-
-
-static PmError alsa_write_byte(PmInternal *midi, unsigned char byte,
- PmTimestamp timestamp)
-{
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- snd_seq_event_t ev;
- int err;
-
- snd_seq_ev_clear(&ev);
- if (snd_midi_event_encode_byte(desc->parser, byte, &ev) == 1) {
- snd_seq_ev_set_dest(&ev, desc->client, desc->port);
- snd_seq_ev_set_source(&ev, desc->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\n");
- err = snd_seq_event_output(seq, &ev);
- if (err < 0) {
- desc->error = err;
- return pmHostError;
- }
- }
- return pmNoError;
-}
-
-
-static PmError alsa_out_close(PmInternal *midi)
-{
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- if (!desc) return pmBadPtr;
-
- if ((pm_hosterror = snd_seq_disconnect_to(seq, desc->this_port,
- desc->client, desc->port))) {
- // if there's an error, try to delete the port anyway, but don't
- // change the pm_hosterror value so we retain the first error
- snd_seq_delete_port(seq, desc->this_port);
- } else { // if there's no error, delete the port and retain any error
- pm_hosterror = snd_seq_delete_port(seq, desc->this_port);
- }
- if (midi->latency > 0) alsa_unuse_queue();
- snd_midi_event_free(desc->parser);
- midi->descriptor = NULL; /* destroy the pointer to signify "closed" */
- pm_free(desc);
- if (pm_hosterror) {
- get_alsa_error_text(pm_hosterror_text, PM_HOST_ERROR_MSG_LEN,
- pm_hosterror);
- return pmHostError;
- }
- return pmNoError;
-}
-
-
-static PmError alsa_in_open(PmInternal *midi, void *driverInfo)
-{
- void *client_port = descriptors[midi->device_id].descriptor;
- alsa_descriptor_type desc = (alsa_descriptor_type)
- pm_alloc(sizeof(alsa_descriptor_node));
- snd_seq_port_info_t *info;
- snd_seq_port_subscribe_t *sub;
- snd_seq_addr_t addr;
- int err;
-
- if (!desc) return pmInsufficientMemory;
-
- err = alsa_use_queue();
- if (err < 0) goto free_desc;
-
- snd_seq_port_info_alloca(&info);
- snd_seq_port_info_set_port(info, midi->device_id);
- snd_seq_port_info_set_capability(info, SND_SEQ_PORT_CAP_WRITE |
- SND_SEQ_PORT_CAP_READ);
- snd_seq_port_info_set_type(info, SND_SEQ_PORT_TYPE_MIDI_GENERIC |
- SND_SEQ_PORT_TYPE_APPLICATION);
- snd_seq_port_info_set_port_specified(info, 1);
- err = snd_seq_create_port(seq, info);
- if (err < 0) goto free_queue;
-
- /* fill in fields of desc, which is passed to pm_write routines */
- midi->descriptor = desc;
- desc->client = GET_DESCRIPTOR_CLIENT(client_port);
- desc->port = GET_DESCRIPTOR_PORT(client_port);
- desc->this_port = midi->device_id;
- desc->in_sysex = 0;
-
- desc->error = 0;
-
- VERBOSE printf("snd_seq_connect_from: %d %d %d\n",
- desc->this_port, desc->client, desc->port);
- snd_seq_port_subscribe_alloca(&sub);
- addr.client = snd_seq_client_id(seq);
- addr.port = desc->this_port;
- snd_seq_port_subscribe_set_dest(sub, &addr);
- addr.client = desc->client;
- addr.port = desc->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);
- /* err =
- snd_seq_connect_from(seq, desc->this_port, desc->client, desc->port); */
- if (err < 0) goto free_this_port; /* clean up and return on error */
- return pmNoError;
-
- free_this_port:
- snd_seq_delete_port(seq, desc->this_port);
- free_queue:
- alsa_unuse_queue();
- free_desc:
- pm_free(desc);
- pm_hosterror = err;
- if (err < 0) {
- get_alsa_error_text(pm_hosterror_text, PM_HOST_ERROR_MSG_LEN, err);
- }
- return pmHostError;
-}
-
-static PmError alsa_in_close(PmInternal *midi)
-{
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- if (!desc) return pmBadPtr;
- if ((pm_hosterror = snd_seq_disconnect_from(seq, desc->this_port,
- desc->client, desc->port))) {
- snd_seq_delete_port(seq, desc->this_port); /* try to close port */
- } else {
- pm_hosterror = snd_seq_delete_port(seq, desc->this_port);
- }
- alsa_unuse_queue();
- pm_free(desc);
- if (pm_hosterror) {
- get_alsa_error_text(pm_hosterror_text, PM_HOST_ERROR_MSG_LEN,
- pm_hosterror);
- return pmHostError;
- }
- return pmNoError;
-}
-
-
-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
- */
- /*
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- snd_seq_remove_events_t info;
- snd_seq_addr_t addr;
- addr.client = desc->client;
- addr.port = desc->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;
-}
-
-
-#ifdef GARBAGE
-This is old code here temporarily for reference
-static PmError alsa_write(PmInternal *midi, PmEvent *buffer, int32_t length)
-{
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- int i, bytes;
- unsigned char byte;
- PmMessage msg;
-
- desc->error = 0;
- for (; length > 0; length--, buffer++) {
- VERBOSE printf("message 0x%x\n", buffer->message);
- if (Pm_MessageStatus(buffer->message) == MIDI_SYSEX)
- desc->in_sysex = TRUE;
- if (desc->in_sysex) {
- msg = buffer->message;
- for (i = 0; i < 4; i++) {
- byte = msg; /* extract next byte to send */
- alsa_write_byte(midi, byte, buffer->timestamp);
- if (byte == MIDI_EOX) {
- desc->in_sysex = FALSE;
- break;
- }
- if (desc->error < 0) break;
- msg >>= 8; /* shift next byte into position */
- }
- } else {
- bytes = midi_message_length(buffer->message);
- msg = buffer->message;
- for (i = 0; i < bytes; i++) {
- byte = msg; /* extract next byte to send */
- VERBOSE printf("sending 0x%x\n", byte);
- alsa_write_byte(midi, byte, buffer->timestamp);
- if (desc->error < 0) break;
- msg >>= 8; /* shift next byte into position */
- }
- }
- }
- if (desc->error < 0) return pmHostError;
-
- VERBOSE printf("snd_seq_drain_output: 0x%x\n", (unsigned int) seq);
- desc->error = snd_seq_drain_output(seq);
- if (desc->error < 0) return pmHostError;
-
- desc->error = pmNoError;
- return pmNoError;
-}
-#endif
-
-
-static PmError alsa_write_flush(PmInternal *midi, PmTimestamp timestamp)
-{
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- VERBOSE printf("snd_seq_drain_output: 0x%x\n", (unsigned int)(FPTR) seq);
- desc->error = snd_seq_drain_output(seq);
- if (desc->error < 0) return pmHostError;
-
- desc->error = pmNoError;
- return pmNoError;
-}
-
-
-static PmError alsa_write_short(PmInternal *midi, PmEvent *event)
-{
- int bytes = midi_message_length(event->message);
- PmMessage msg = event->message;
- int i;
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- 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 (desc->error < 0) break;
- msg >>= 8; /* shift next byte into position */
- }
- if (desc->error < 0) return pmHostError;
- desc->error = pmNoError;
- 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 = descriptors[device_id].internalDescriptor;
- PmEvent pm_ev;
- PmTimeProcPtr time_proc = midi->time_proc;
- PmTimestamp timestamp;
-
- /* 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);
-
- /* if no time_proc, just return "native" ticks (ms) */
- if (time_proc == NULL) {
- timestamp = ev->time.tick;
- } else { /* 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);
- /* return (now - alsa_now) + alsa_timestamp */
- timestamp = (*time_proc)(midi->time_info) + ev->time.tick -
- snd_seq_queue_status_get_tick_time(queue_status);
- }
- 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;
- }
- }
-}
-
-
-static PmError alsa_poll(PmInternal *midi)
-{
- 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_index; i++) {
- if (descriptors[i].pub.input) {
- PmInternal *midi = (PmInternal *)
- descriptors[i].internalDescriptor;
- /* careful, device may not be open! */
- if (midi) Pm_SetOverflow(midi->queue);
- }
- }
- }
- }
- }
- return pmNoError;
-}
-
-
-static unsigned int alsa_has_host_error(PmInternal *midi)
-{
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- return desc->error;
-}
-
-
-static void alsa_get_host_error(PmInternal *midi, char *msg, unsigned int len)
-{
- alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
- int err = (pm_hosterror || desc->error);
- get_alsa_error_text(msg, len, err);
-}
-
-
-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_has_host_error,
- alsa_get_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_has_host_error,
- alsa_get_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;
-
- /* 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) return err;
-
- 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_index;
- // FIXME: pm_strdup() result is leaked
- pm_add_device((char *)"ALSA",
- pm_strdup(snd_seq_port_info_get_name(pinfo)),
- 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_index;
- // FIXME: pm_strdup() result is leaked
- pm_add_device((char *)"ALSA",
- pm_strdup(snd_seq_port_info_get_name(pinfo)),
- TRUE,
- MAKE_DESCRIPTOR(snd_seq_port_info_get_client(pinfo),
- snd_seq_port_info_get_port(pinfo)),
- &pm_linuxalsa_in_dictionary);
- }
- }
- }
- return pmNoError;
-}
-
-
-void pm_linuxalsa_term(void)
-{
- if (seq) {
- snd_seq_close(seq);
- pm_free(descriptors);
- descriptors = NULL;
- pm_descriptor_index = 0;
- pm_descriptor_max = 0;
- }
-}