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aplaymidi: handle big SysEx commands

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Make sure that the sequencer output buffer is big enough to handle all
events that we send, and split large SysEx commands into one-second
chunks so that the sequencer kernel code can handle them.
This commit is contained in:
Clemens Ladisch 2006-12-04 18:01:23 +01:00
parent 815fc4bea0
commit 4de3d5a273
1 changed files with 35 additions and 1 deletions
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36
seq/aplaymidi/aplaymidi.c
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@ -1,7 +1,7 @@
/*
* aplaymidi.c - play Standard MIDI Files to sequencer port(s)
*
* Copyright (c) 2004 Clemens Ladisch <clemens@ladisch.de>
* Copyright (c) 2004-2006 Clemens Ladisch <clemens@ladisch.de>
*
*
* This program is free software; you can redistribute it and/or modify
@ -31,6 +31,8 @@
#include "aconfig.h"
#include "version.h"
#define MIDI_BYTES_PER_SEC 3125
/*
* A MIDI event after being parsed/loaded from the file.
* There could be made a case for using snd_seq_event_t instead.
@ -601,6 +603,37 @@ static void cleanup_file_data(void)
tracks = NULL;
}
static void handle_big_sysex(snd_seq_event_t *ev)
{
unsigned int length;
ssize_t event_size;
int err;
length = ev->data.ext.len;
if (length > MIDI_BYTES_PER_SEC)
ev->data.ext.len = MIDI_BYTES_PER_SEC;
event_size = snd_seq_event_length(ev);
if (event_size + 1 > snd_seq_get_output_buffer_size(seq)) {
err = snd_seq_drain_output(seq);
check_snd("drain output", err);
err = snd_seq_set_output_buffer_size(seq, event_size + 1);
check_snd("set output buffer size", err);
}
while (length > MIDI_BYTES_PER_SEC) {
err = snd_seq_event_output(seq, ev);
check_snd("output event", err);
err = snd_seq_drain_output(seq);
check_snd("drain output", err);
err = snd_seq_sync_output_queue(seq);
check_snd("sync output", err);
if (sleep(1))
fatal("aborted");
ev->data.ext.ptr += MIDI_BYTES_PER_SEC;
length -= MIDI_BYTES_PER_SEC;
}
ev->data.ext.len = length;
}
static void play_midi(void)
{
snd_seq_event_t ev;
@ -684,6 +717,7 @@ static void play_midi(void)
case SND_SEQ_EVENT_SYSEX:
snd_seq_ev_set_variable(&ev, event->data.length,
event->sysex);
handle_big_sysex(&ev);
break;
case SND_SEQ_EVENT_TEMPO:
snd_seq_ev_set_fixed(&ev);