[src/trunk]: src/lib/libossaudio ossaudio(3): Add an implementation of SNDCTL...

[nia <nia%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/79faadc190e2
branches:  trunk
changeset: 956157:79faadc190e2
user:      nia <nia%NetBSD.org@localhost>
date:      Fri Oct 23 09:05:20 2020 +0000

description:
ossaudio(3): Add an implementation of SNDCTL_CARDINFO

Correct some of the counts returned by SNDCTL_SYSINFO so this works.

diffstat:

 lib/libossaudio/ossaudio.c  |  71 +++++++++++++++++++++++++++++++++++++++++---
 lib/libossaudio/soundcard.h |  14 ++++++++-
 2 files changed, 79 insertions(+), 6 deletions(-)

diffs (159 lines):

diff -r 2f72a51cfece -r 79faadc190e2 lib/libossaudio/ossaudio.c
--- a/lib/libossaudio/ossaudio.c        Fri Oct 23 07:14:32 2020 +0000
+++ b/lib/libossaudio/ossaudio.c        Fri Oct 23 09:05:20 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ossaudio.c,v 1.55 2020/10/22 19:39:48 nia Exp $        */
+/*     $NetBSD: ossaudio.c,v 1.56 2020/10/23 09:05:20 nia Exp $        */
 
 /*-
  * Copyright (c) 1997, 2020 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: ossaudio.c,v 1.55 2020/10/22 19:39:48 nia Exp $");
+__RCSID("$NetBSD: ossaudio.c,v 1.56 2020/10/23 09:05:20 nia Exp $");
 
 /*
  * This is an Open Sound System compatibility layer, which provides
@@ -67,6 +67,7 @@
 
 static struct audiodevinfo *getdevinfo(int);
 
+static int getaudiocount(void);
 static int getmixercount(void);
 static int getmixercontrolcount(int);
 
@@ -1016,6 +1017,7 @@
 mixer_oss4_ioctl(int fd, unsigned long com, void *argp)
 {
        oss_audioinfo *tmpai;
+       oss_card_info *cardinfo;
        oss_mixext *ext;
        oss_mixext_root root;
        oss_mixer_enuminfo *ei;
@@ -1147,6 +1149,43 @@
                argp = tmpai;
                close(newfd);
                break;
+       case SNDCTL_CARDINFO:
+               cardinfo = (oss_card_info *)argp;
+               if (cardinfo == NULL)
+                       return EINVAL;
+               if (cardinfo->card != -1) {
+                       snprintf(devname, sizeof(devname),
+                           "/dev/audio%d", cardinfo->card);
+                       newfd = open(devname, O_RDONLY);
+                       if (newfd < 0)
+                               return retval;
+               } else {
+                       newfd = fd;
+               }
+               retval = ioctl(newfd, AUDIO_GETDEV, &dev);
+               tmperrno = errno;
+               if (newfd != fd)
+                       close(newfd);
+               if (retval < 0) {
+                       errno = tmperrno;
+                       return retval;
+               }
+               strlcpy(cardinfo->shortname, dev.name,
+                   sizeof(cardinfo->shortname));
+               snprintf(cardinfo->longname, sizeof(cardinfo->longname),
+                   "%s %s %s", dev.name, dev.version, dev.config);
+               memset(cardinfo->hw_info, 0, sizeof(cardinfo->hw_info));
+               /*
+                * OSSv4 does not document this ioctl, and claims it should
+                * not be used by applications and is provided for "utiltiy
+                * programs included in OSS". We follow the Solaris
+                * implementation (which is doucmented) and leave these fields
+                * unset.
+                */
+               cardinfo->flags = 0;
+               cardinfo->intr_count = 0;
+               cardinfo->ack_count = 0;
+               break;
        case SNDCTL_SYSINFO:
                memset(&sysinfo, 0, sizeof(sysinfo));
                strlcpy(sysinfo.product,
@@ -1156,13 +1195,14 @@
                strlcpy(sysinfo.license,
                    "BSD", sizeof(sysinfo.license));
                sysinfo.versionnum = SOUND_VERSION;
-               sysinfo.numaudios = OSS_MAX_AUDIO_DEVS;
+               sysinfo.numaudios = 
+                   sysinfo.numcards =
+                       getaudiocount();
                sysinfo.numaudioengines = 1;
                sysinfo.numsynths = 1;
                sysinfo.nummidis = -1;
                sysinfo.numtimers = -1;
-               sysinfo.nummixers = OSS_MAX_AUDIO_DEVS;
-               sysinfo.numcards = 1;
+               sysinfo.nummixers = getmixercount();
                *(struct oss_sysinfo *)argp = sysinfo;
                break;
        case SNDCTL_MIXERINFO:
@@ -1553,6 +1593,27 @@
 }
 
 static int
+getaudiocount(void)
+{
+       char devname[32];
+       int ndevs = 0;
+       int tmpfd;
+       int tmperrno = errno;
+
+       do {
+               snprintf(devname, sizeof(devname),
+                   "/dev/audio%d", ndevs);
+               if ((tmpfd = open(devname, O_RDONLY)) != -1 ||
+                   (tmpfd = open(devname, O_WRONLY)) != -1) {
+                       ndevs++;
+                       close(tmpfd);
+               }
+       } while (tmpfd != -1);
+       errno = tmperrno;
+       return ndevs;
+}
+
+static int
 getmixercount(void)
 {
        char devname[32];
diff -r 2f72a51cfece -r 79faadc190e2 lib/libossaudio/soundcard.h
--- a/lib/libossaudio/soundcard.h       Fri Oct 23 07:14:32 2020 +0000
+++ b/lib/libossaudio/soundcard.h       Fri Oct 23 09:05:20 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: soundcard.h,v 1.30 2020/10/20 08:57:45 nia Exp $       */
+/*     $NetBSD: soundcard.h,v 1.31 2020/10/23 09:05:20 nia Exp $       */
 
 /*-
  * Copyright (c) 1997, 2020 The NetBSD Foundation, Inc.
@@ -407,6 +407,17 @@
        int filler[184];                        /* For expansion */
 } oss_audioinfo;
 
+typedef struct oss_card_info {
+       int card;
+       char shortname[16];
+       char longname[128];
+       int flags;
+       char hw_info[400];
+       int intr_count;
+       int ack_count;
+       int filler[154];
+} oss_card_info;
+
 #define SNDCTL_SYSINFO         _IOR ('X', 1, oss_sysinfo)
 #define OSS_SYSINFO            SNDCTL_SYSINFO /* Old name */
 #define SNDCTL_MIX_NRMIX       _IOR ('X',2, int)
@@ -417,6 +428,7 @@
 #define SNDCTL_AUDIOINFO       _IOWR ('X',7, oss_audioinfo)
 #define SNDCTL_MIX_ENUMINFO    _IOWR ('X',8, oss_mixer_enuminfo)
 #define SNDCTL_MIXERINFO       _IOWR ('X',10, oss_mixerinfo)
+#define SNDCTL_CARDINFO                _IOWR ('X',11, oss_card_info)
 #define SNDCTL_ENGINEINFO      _IOWR ('X',12, oss_audioinfo)
 #define SNDCTL_AUDIOINFO_EX    _IOWR ('X',13, oss_audioinfo)
 #define SNDCTL_MIX_DESCRIPTION _IOWR ('X',14, oss_mixer_enuminfo)