[src/trunk]: src/lib/libossaudio ossaudio: Various OSSv4 fixes for SNDCTL_AUD...

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

details:   https://anonhg.NetBSD.org/src/rev/58158ddce7cc
branches:  trunk
changeset: 944917:58158ddce7cc
user:      nia <nia%NetBSD.org@localhost>
date:      Fri Oct 16 12:23:34 2020 +0000

description:
ossaudio: Various OSSv4 fixes for SNDCTL_AUDIOINFO

- Per OSSv4, make this ioctl work on the main mixer device.
  Since the native NetBSD API uses queries on individual audio devices,
  we have to reopen the correct audio device specified in the input to the
  ioctl and fetch information from that.
- Correctly return whether the device is for playback, capture, or both.
- Return the full name of the device in the name field.
- The "handle" has to be a globally unique identifier. The closest thing
  we have to that is device numbers, so use device numbers.
- Return reasonable values in min_rate/max_rate and min_channels/max_channels.

This should allow Mumble's device enumeration to work with a lot less
patching.

diffstat:

 lib/libossaudio/ossaudio.c |  77 ++++++++++++++++++++++++++++-----------------
 1 files changed, 47 insertions(+), 30 deletions(-)

diffs (133 lines):

diff -r 446b03f8cfab -r 58158ddce7cc lib/libossaudio/ossaudio.c
--- a/lib/libossaudio/ossaudio.c        Fri Oct 16 11:17:54 2020 +0000
+++ b/lib/libossaudio/ossaudio.c        Fri Oct 16 12:23:34 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ossaudio.c,v 1.44 2020/04/20 12:01:44 nia Exp $        */
+/*     $NetBSD: ossaudio.c,v 1.45 2020/10/16 12:23:34 nia Exp $        */
 
 /*-
  * Copyright (c) 1997 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: ossaudio.c,v 1.44 2020/04/20 12:01:44 nia Exp $");
+__RCSID("$NetBSD: ossaudio.c,v 1.45 2020/10/16 12:23:34 nia Exp $");
 
 /*
  * This is an OSS (Linux) sound API emulator.
@@ -103,6 +103,7 @@
        struct audio_info tmpinfo, hwfmt;
        struct audio_offset tmpoffs;
        struct audio_buf_info bufinfo;
+       struct audio_format_query fmtq;
        struct count_info cntinfo;
        struct audio_encoding tmpenc;
        struct oss_sysinfo tmpsysinfo;
@@ -116,8 +117,9 @@
        u_int encoding;
        u_int precision;
        int idat, idata;
+       int props;
        int retval;
-       int i;
+       int newfd;
 
        idat = 0;
 
@@ -583,53 +585,68 @@
                        tmpaudioinfo->dev = 0;
 
                snprintf(tmpaudioinfo->devnode, OSS_DEVNODE_SIZE,
-                   "/dev/audio%d", tmpaudioinfo->dev); 
+                   "/dev/audio%d", tmpaudioinfo->dev);
 
-               retval = ioctl(fd, AUDIO_GETDEV, &tmpaudiodev);
-               if (retval < 0)
-                       return retval;
-               retval = ioctl(fd, AUDIO_GETINFO, &tmpinfo);
-               if (retval < 0)
+               if ((newfd = open(tmpaudioinfo->devnode, O_WRONLY)) < 0) {
+                       if ((newfd = open(tmpaudioinfo->devnode, O_RDONLY)) < 0) {
+                               return newfd;
+                       }
+               }
+
+               retval = ioctl(newfd, AUDIO_GETDEV, &tmpaudiodev);
+               if (retval < 0) {
+                       close(newfd);
                        return retval;
-               retval = ioctl(fd, AUDIO_GETPROPS, &idata);
-               if (retval < 0)
+               }
+               retval = ioctl(newfd, AUDIO_GETPROPS, &props);
+               if (retval < 0) {
+                       close(newfd);
                        return retval;
+               }
                idat = DSP_CAP_TRIGGER;
-               if (idata & AUDIO_PROP_FULLDUPLEX)
+               if (props & AUDIO_PROP_FULLDUPLEX)
                        idat |= DSP_CAP_DUPLEX;
-               if (idata & AUDIO_PROP_MMAP)
+               if (props & AUDIO_PROP_MMAP)
                        idat |= DSP_CAP_MMAP;
-               idat = PCM_CAP_INPUT | PCM_CAP_OUTPUT;
-               strlcpy(tmpaudioinfo->name, tmpaudiodev.name,
-                   sizeof tmpaudioinfo->name);
-               tmpaudioinfo->busy = tmpinfo.play.open;
+               if (props & AUDIO_PROP_CAPTURE)
+                       idat |= PCM_CAP_INPUT;
+               if (props & AUDIO_PROP_PLAYBACK)
+                       idat |= PCM_CAP_OUTPUT;
+               snprintf(tmpaudioinfo->name, sizeof(tmpaudioinfo->name),
+                   "%s %s", tmpaudiodev.name, tmpaudiodev.version);
+               tmpaudioinfo->busy = 0;
                tmpaudioinfo->pid = -1;
                tmpaudioinfo->caps = idat;
-               ioctl(fd, SNDCTL_DSP_GETFMTS, &tmpaudioinfo->iformats);
+               ioctl(newfd, SNDCTL_DSP_GETFMTS, &tmpaudioinfo->iformats);
                tmpaudioinfo->oformats = tmpaudioinfo->iformats;
                tmpaudioinfo->magic = -1;
-               memset(tmpaudioinfo->cmd, 0, 64);
+               memset(tmpaudioinfo->cmd, 0, sizeof(tmpaudioinfo->cmd));
                tmpaudioinfo->card_number = -1;
-               memset(tmpaudioinfo->song_name, 0, 64);
-               memset(tmpaudioinfo->label, 0, 16);
-               tmpaudioinfo->port_number = tmpinfo.play.port;
+               memset(tmpaudioinfo->song_name, 0,
+                   sizeof(tmpaudioinfo->song_name));
+               memset(tmpaudioinfo->label, 0, sizeof(tmpaudioinfo->label));
+               tmpaudioinfo->port_number = 0;
                tmpaudioinfo->mixer_dev = tmpaudioinfo->dev;
                tmpaudioinfo->legacy_device = -1;
                tmpaudioinfo->enabled = 1;
                tmpaudioinfo->flags = -1;
-               tmpaudioinfo->min_rate = tmpinfo.play.sample_rate;
-               tmpaudioinfo->max_rate = tmpinfo.play.sample_rate;
-               tmpaudioinfo->nrates = 2;
-               for (i = 0; i < tmpaudioinfo->nrates; i++)
-                       tmpaudioinfo->rates[i] = tmpinfo.play.sample_rate;
-               tmpaudioinfo->min_channels = tmpinfo.play.channels;
-               tmpaudioinfo->max_channels = tmpinfo.play.channels;
+               tmpaudioinfo->min_rate = 8000;
+               tmpaudioinfo->max_rate = 192000;
+               tmpaudioinfo->nrates = 0;
+               tmpaudioinfo->min_channels = 1;
+               tmpaudioinfo->max_channels = 2;
+               for (fmtq.index = 0; ioctl(newfd, AUDIO_QUERYFORMAT, &fmtq) != -1; ++fmtq.index) {
+                       if (fmtq.fmt.channels > (unsigned)tmpaudioinfo->max_channels)
+                               tmpaudioinfo->max_channels = fmtq.fmt.channels;
+               }
                tmpaudioinfo->binding = -1;
                tmpaudioinfo->rate_source = -1;
-               memset(tmpaudioinfo->handle, 0, 16);
+               strlcpy(tmpaudioinfo->handle, tmpaudioinfo->devnode,
+                   sizeof(tmpaudioinfo->handle));
                tmpaudioinfo->next_play_engine = 0;
                tmpaudioinfo->next_rec_engine = 0;
                argp = tmpaudioinfo;
+               close(newfd);
                break;
        case SNDCTL_DSP_SETPLAYVOL:
                setvol(fd, INTARG, false);