ossaudio: If the user's channel count is rejected, use the hardware count
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nia
parent
7354445c97
commit
87706eec7d
@ -1,4 +1,4 @@
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/* $NetBSD: ossaudio.c,v 1.40 2020/04/15 15:25:33 nia Exp $ */
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/* $NetBSD: ossaudio.c,v 1.41 2020/04/15 16:39:06 nia Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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@ -27,7 +27,7 @@
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: ossaudio.c,v 1.40 2020/04/15 15:25:33 nia Exp $");
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__RCSID("$NetBSD: ossaudio.c,v 1.41 2020/04/15 16:39:06 nia Exp $");
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/*
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* This is an OSS (Linux) sound API emulator.
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@ -63,6 +63,7 @@ __RCSID("$NetBSD: ossaudio.c,v 1.40 2020/04/15 15:25:33 nia Exp $");
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static struct audiodevinfo *getdevinfo(int);
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static void setchannels(int, int, int);
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static void setblocksize(int, struct audio_info *);
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static int audio_ioctl(int, unsigned long, void *);
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@ -350,12 +351,10 @@ audio_ioctl(int fd, unsigned long com, void *argp)
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INTARG = idat;
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break;
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case SNDCTL_DSP_CHANNELS:
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.play.channels = INTARG;
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(void) ioctl(fd, AUDIO_SETINFO, &tmpinfo);
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.record.channels = INTARG;
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(void) ioctl(fd, AUDIO_SETINFO, &tmpinfo);
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retval = ioctl(fd, AUDIO_GETBUFINFO, &tmpinfo);
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if (retval < 0)
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return retval;
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setchannels(fd, tmpinfo.mode, INTARG);
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/* FALLTHRU */
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case SOUND_PCM_READ_CHANNELS:
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retval = ioctl(fd, AUDIO_GETBUFINFO, &tmpinfo);
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@ -1048,6 +1047,54 @@ mixer_ioctl(int fd, unsigned long com, void *argp)
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return 0;
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}
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/*
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* When AUDIO_SETINFO fails to set a channel count, the application's chosen
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* number is out of range of what the kernel allows.
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*
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* When this happens, we use the current hardware settings. This is just in
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* case an application is abusing SNDCTL_DSP_CHANNELS - OSSv4 always sets and
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* returns a reasonable value, even if it wasn't what the user requested.
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*
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* XXX: If a device is opened for both playback and recording, and supports
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* fewer channels for recording than playback, applications that do both will
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* behave very strangely. OSS doesn't allow for reporting separate channel
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* counts for recording and playback. This could be worked around by always
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* mixing recorded data up to the same number of channels as is being used
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* for playback.
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*/
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static void
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setchannels(int fd, int mode, int nchannels)
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{
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struct audio_info tmpinfo, hwfmt;
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if (ioctl(fd, AUDIO_GETFORMAT, &hwfmt) < 0) {
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errno = 0;
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hwfmt.record.channels = hwfmt.play.channels = 2;
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}
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if (mode & AUMODE_PLAY) {
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.play.channels = nchannels;
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if (ioctl(fd, AUDIO_SETINFO, &tmpinfo) < 0) {
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errno = 0;
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.play.channels = hwfmt.play.channels;
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(void)ioctl(fd, AUDIO_SETINFO, &tmpinfo);
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}
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}
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if (mode & AUMODE_RECORD) {
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.record.channels = nchannels;
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if (ioctl(fd, AUDIO_SETINFO, &tmpinfo) < 0) {
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errno = 0;
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.record.channels = hwfmt.record.channels;
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(void)ioctl(fd, AUDIO_SETINFO, &tmpinfo);
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}
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}
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}
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/*
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* Check that the blocksize is a power of 2 as OSS wants.
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* If not, set it to be.
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@ -1,4 +1,4 @@
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/* $NetBSD: ossaudio.c,v 1.80 2020/04/15 15:25:33 nia Exp $ */
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/* $NetBSD: ossaudio.c,v 1.81 2020/04/15 16:39:06 nia Exp $ */
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/*-
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* Copyright (c) 1997, 2008 The NetBSD Foundation, Inc.
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@ -27,7 +27,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ossaudio.c,v 1.80 2020/04/15 15:25:33 nia Exp $");
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__KERNEL_RCSID(0, "$NetBSD: ossaudio.c,v 1.81 2020/04/15 16:39:06 nia Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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@ -68,6 +68,7 @@ static int opaque_to_enum(struct audiodevinfo *di, audio_mixer_name_t *label, in
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static int enum_to_ord(struct audiodevinfo *di, int enm);
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static int enum_to_mask(struct audiodevinfo *di, int enm);
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static void setchannels(file_t *, int, int);
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static void setblocksize(file_t *, struct audio_info *);
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#ifdef AUDIO_DEBUG
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@ -487,15 +488,13 @@ oss_ioctl_audio(struct lwp *l, const struct oss_sys_ioctl_args *uap, register_t
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__func__, error));
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goto out;
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}
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tmpinfo.play.channels =
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tmpinfo.record.channels = idat;
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DPRINTF(("%s: SNDCTL_DSP_CHANNELS > %d\n", __func__, idat));
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error = ioctlf(fp, AUDIO_SETINFO, &tmpinfo);
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error = ioctlf(fp, AUDIO_GETBUFINFO, &tmpinfo);
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if (error) {
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DPRINTF(("%s: AUDIO_SETINFO %d\n",
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DPRINTF(("%s: AUDIO_GETBUFINFO %d\n",
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__func__, error));
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goto out;
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}
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setchannels(fp, tmpinfo.mode, idat);
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/* FALLTHROUGH */
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case OSS_SOUND_PCM_READ_CHANNELS:
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error = ioctlf(fp, AUDIO_GETBUFINFO, &tmpinfo);
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@ -1531,6 +1530,54 @@ oss_ioctl_sequencer(struct lwp *l, const struct oss_sys_ioctl_args *uap, registe
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return error;
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}
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/*
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* When AUDIO_SETINFO fails to set a channel count, the application's chosen
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* number is out of range of what the kernel allows.
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*
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* When this happens, we use the current hardware settings. This is just in
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* case an application is abusing SNDCTL_DSP_CHANNELS - OSSv4 always sets and
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* returns a reasonable value, even if it wasn't what the user requested.
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*
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* XXX: If a device is opened for both playback and recording, and supports
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* fewer channels for recording than playback, applications that do both will
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* behave very strangely. OSS doesn't allow for reporting separate channel
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* counts for recording and playback. This could be worked around by always
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* mixing recorded data up to the same number of channels as is being used
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* for playback.
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*/
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static void
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setchannels(file_t *fp, int mode, int nchannels)
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{
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struct audio_info tmpinfo, hwfmt;
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int (*ioctlf)(file_t *, u_long, void *);
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ioctlf = fp->f_ops->fo_ioctl;
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if (ioctlf(fp, AUDIO_GETFORMAT, &hwfmt) < 0) {
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hwfmt.record.channels = hwfmt.play.channels = 2;
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}
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if (mode & AUMODE_PLAY) {
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.play.channels = nchannels;
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if (ioctlf(fp, AUDIO_SETINFO, &tmpinfo) < 0) {
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.play.channels = hwfmt.play.channels;
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(void)ioctlf(fp, AUDIO_SETINFO, &tmpinfo);
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}
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}
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if (mode & AUMODE_RECORD) {
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.record.channels = nchannels;
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if (ioctlf(fp, AUDIO_SETINFO, &tmpinfo) < 0) {
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AUDIO_INITINFO(&tmpinfo);
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tmpinfo.record.channels = hwfmt.record.channels;
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(void)ioctlf(fp, AUDIO_SETINFO, &tmpinfo);
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}
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}
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}
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/*
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* Check that the blocksize is a power of 2 as OSS wants.
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* If not, set it to be.
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