[Pkg-alsa-devel] Bug#100041: marked as done (/dev/music MIDI adds unwanted staccatos on first "long" note after seq_reset())
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From: Sylvain Bernier <toe@soon.com>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: /dev/music MIDI adds unwanted staccatos on first "long" note after seq_reset()
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Date: Thu, 07 Jun 2001 23:51:10 -0400
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Package: alsa-source
Version: 0.9+0beta4-4
Severity: normal
Here is a little program that shows the problem. It tries to play 1/8 notes and then 1/2 notes. The first 1/2 note played is shortened. A ~400-500 ms sleep right after seq_reset corrects the problem. But it seems to be quite a long delay needed for such a task.
reset.cpp
------------------------------------------------------------------------------
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/soundcard.h>
#include <sys/ioctl.h>
#define DEVICE "/dev/music"
#define CHANNEL 1
#define PORT 1
#define TEMPO 80
int seqfd = -1;
SEQ_DEFINEBUF(2048);
void seqbuf_dump()
{
if (seqfd != -1 && _seqbufptr) {
if (write (seqfd, _seqbuf, _seqbufptr) == -1) perror("seqbuf_dump: error");
_seqbufptr = 0;
}
}
void init_tempo()
{
// ::: initializing timer :::
{
int i = 96;
if (ioctl(seqfd, SNDCTL_TMR_TIMEBASE, &i) == -1) perror("SNDCTL_TMR_TIMEBASE: error");
i = TEMPO;
if (ioctl(seqfd, SNDCTL_TMR_TEMPO, &i) == -1) perror("SNDCTL_TMR_TEMPO: error");
SEQ_START_TIMER();
}
}
int main()
{
printf ("\nreset.cpp : unwanted staccato MIDI test\n");
printf ("contact : Sylvain Bernier (toe@soon.com)\n");
printf ("\n");
printf ("device : %s\ndevice num : %d\nmidi channel : %d\ntempo : %d\n\n", DEVICE, PORT, CHANNEL, TEMPO);
printf ("my computer : PENTIUM 166, linux 2.4.2, ALSA emu10k1, Roland Sound Canvas\n\n");
printf ("each test is supposed to play : | c8 d e f g a b c | c,2 d e f g a b
c |\n");
printf ("notice how some notes are played 'staccato' without our permission.\n\n");
printf ("on my computer, 1/8 notes are OK, but the first c2 is shortened.\n"); printf ("as the sleep delay increases after each SNDCLT_SEQ_RESET, we notice that the problem disapears around 400 ms (my computer)\n");
printf ("\n");
for (int h = 0; h <= 10; h++) {
// :::: /dev/music device open ::::
seqfd = open(DEVICE, O_RDWR);
if (seqfd == -1) {
perror("/dev/music: error");
return -1;
}
// ::: SNDCLT_SEQ_RESET :::
if (ioctl(seqfd, SNDCTL_SEQ_RESET) != 0) perror("SNDCLT_SEQ_RESET: error");
// ------------------------------------------------
printf("test %d/11 : usleep(%d)\n", h + 1, (h * 50000));
usleep(h * 50000);
// ------------------------------------------------
init_tempo();
// ::: sending in the clowns :::
for (int k = 1; k <= 4; k = k * 4) {
for (int x = 0; x <= 12; x += 2) {
SEQ_START_NOTE(PORT, CHANNEL, 60 + x, 0x60);
SEQ_DELTA_TIME((96 / 2) * k); // each note lasts k 1/8 notes
SEQ_STOP_NOTE(PORT, CHANNEL, 60 + x, 0);
if (x == 4 || x == 11) x--;
}
}
seqbuf_dump();
close(seqfd);
}
printf("\n");
return 0;
}
------------------------------------------------------------------------------
-- System Information
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux compusaurus 2.4.2 #5 Sat Apr 28 02:40:26 EDT 2001 i586
Locale: LANG=C, LC_CTYPE=C
Versions of packages alsa-source depends on:
ii debconf 0.9.62 Debian configuration management sy
hi gcc 1:2.95.3-7 The GNU C compiler.
hi gcc [c-compiler] 1:2.95.3-7 The GNU C compiler.
hi gcc-2.95 [c-compiler] 1:2.95.4-0.010506 The GNU C compiler.
ii make 3.79.1-6 The GNU version of the "make" util
---------------------------------------
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Sat, 4 Sep 2004 13:26:02 +0200 (CEST)
Subject: Closing driver bug reports more than 2 years old
From: Thomas Hood <jdthood@aglu.demon.nl>
To: 100041-done@bugs.debian.org, 108572-done@bugs.debian.org,
126797-done@bugs.debian.org
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Closing driver bug reports more than 2 years old since they
aren't likely to be relevant any more.
--
Thomas