gstreamer/sys/oss/gstossmixer.c
Ronald S. Bultje 96fc83aeac Interface implementation example: OSS mixer. Also osscommon->osselement so it can be loaded without being a source/si...
Original commit message from CVS:
Interface implementation example: OSS mixer. Also osscommon->osselement so it can be loaded without being a source/sink (for a stand-alone mixer)
2003-09-13 01:22:59 +00:00

323 lines
9 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstossmixer.h: mixer interface implementation for OSS
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include "gstossmixer.h"
#define MASK_BIT_IS_SET(mask, bit) \
(mask & (1 << bit))
static gboolean gst_ossmixer_supported (GstInterface *iface);
static const GList * gst_ossmixer_list_channels (GstMixer *ossmixer);
static void gst_ossmixer_set_volume (GstMixer *ossmixer,
GstMixerChannel *channel,
gint *volumes);
static void gst_ossmixer_get_volume (GstMixer *ossmixer,
GstMixerChannel *channel,
gint *volumes);
static void gst_ossmixer_set_record (GstMixer *ossmixer,
GstMixerChannel *channel,
gboolean record);
static void gst_ossmixer_set_mute (GstMixer *ossmixer,
GstMixerChannel *channel,
gboolean mute);
static const gchar *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
GstMixerChannel *
gst_ossmixer_channel_new (GstOssElement *oss,
gint channel_num,
gint max_chans,
gint flags)
{
GstMixerChannel *channel = (GstMixerChannel *) g_new (GstOssMixerChannel, 1);
gint volumes[2];
channel->label = g_strdup (labels[channel_num]);
channel->num_channels = max_chans;
channel->flags = flags;
channel->min_volume = 0;
channel->max_volume = 100;
((GstOssMixerChannel *) channel)->channel_num = channel_num;
/* volume */
gst_ossmixer_get_volume (GST_MIXER (oss),
channel, volumes);
if (max_chans == 1) {
volumes[1] = 0;
}
((GstOssMixerChannel *) channel)->lvol = volumes[0];
((GstOssMixerChannel *) channel)->rvol = volumes[1];
return channel;
}
void
gst_ossmixer_channel_free (GstMixerChannel *channel)
{
g_free (channel->label);
g_free (channel);
}
void
gst_oss_interface_init (GstInterfaceClass *klass)
{
/* default virtual functions */
klass->supported = gst_ossmixer_supported;
}
void
gst_ossmixer_interface_init (GstMixerClass *klass)
{
/* default virtual functions */
klass->list_channels = gst_ossmixer_list_channels;
klass->set_volume = gst_ossmixer_set_volume;
klass->get_volume = gst_ossmixer_get_volume;
klass->set_mute = gst_ossmixer_set_mute;
klass->set_record = gst_ossmixer_set_record;
}
static gboolean
gst_ossmixer_supported (GstInterface *iface)
{
return (GST_OSSELEMENT (iface)->mixer_fd != -1);
}
static const GList *
gst_ossmixer_list_channels (GstMixer *mixer)
{
GstOssElement *oss = GST_OSSELEMENT (mixer);
g_return_val_if_fail (oss->mixer_fd != -1, NULL);
return (const GList *) GST_OSSELEMENT (mixer)->channellist;
}
static void
gst_ossmixer_get_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes)
{
gint volume;
GstOssElement *oss = GST_OSSELEMENT (mixer);
GstOssMixerChannel *osschannel = (GstOssMixerChannel *) channel;
g_return_if_fail (oss->mixer_fd != -1);
if (channel->flags & GST_MIXER_CHANNEL_MUTE) {
volumes[0] = osschannel->lvol;
if (channel->num_channels == 2) {
volumes[1] = osschannel->rvol;
}
} else {
/* get */
if (ioctl(oss->mixer_fd, MIXER_READ (osschannel->channel_num), &volume) < 0) {
g_warning("Error getting recording device (%d) volume (0x%x): %s\n",
osschannel->channel_num, volume, strerror(errno));
volume = 0;
}
osschannel->lvol = volumes[0] = (volume & 0xff);
if (channel->num_channels == 2) {
osschannel->rvol = volumes[1] = ((volume >> 8) & 0xff);
}
}
}
static void
gst_ossmixer_set_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes)
{
gint volume;
GstOssElement *oss = GST_OSSELEMENT (mixer);
GstOssMixerChannel *osschannel = (GstOssMixerChannel *) channel;
g_return_if_fail (oss->mixer_fd != -1);
/* prepare the value for ioctl() */
if (!(channel->flags & GST_MIXER_CHANNEL_MUTE)) {
volume = (volumes[0] & 0xff);
if (channel->num_channels == 2) {
volume |= ((volumes[1] & 0xff) << 8);
}
/* set */
if (ioctl(oss->mixer_fd, MIXER_WRITE (osschannel->channel_num), &volume) < 0) {
g_warning("Error setting recording device (%d) volume (0x%x): %s\n",
osschannel->channel_num, volume, strerror(errno));
return;
}
}
osschannel->lvol = volumes[0];
if (channel->num_channels == 2) {
osschannel->rvol = volumes[1];
}
}
static void
gst_ossmixer_set_mute (GstMixer *mixer,
GstMixerChannel *channel,
gboolean mute)
{
int volume;
GstOssElement *oss = GST_OSSELEMENT (mixer);
GstOssMixerChannel *osschannel = (GstOssMixerChannel *) channel;
g_return_if_fail (oss->mixer_fd != -1);
if (mute) {
volume = 0;
} else {
volume = (osschannel->lvol & 0xff);
if (MASK_BIT_IS_SET (oss->stereomask, osschannel->channel_num)) {
volume |= ((osschannel->rvol & 0xff) << 8);
}
}
if (ioctl(oss->mixer_fd, MIXER_WRITE(osschannel->channel_num), &volume) < 0) {
g_warning("Error setting mixer recording device volume (0x%x): %s",
volume, strerror(errno));
return;
}
if (mute) {
channel->flags |= GST_MIXER_CHANNEL_MUTE;
} else {
channel->flags &= ~GST_MIXER_CHANNEL_MUTE;
}
}
static void
gst_ossmixer_set_record (GstMixer *mixer,
GstMixerChannel *channel,
gboolean record)
{
GstOssElement *oss = GST_OSSELEMENT (mixer);
GstOssMixerChannel *osschannel = (GstOssMixerChannel *) channel;
g_return_if_fail (oss->mixer_fd != -1);
/* if we're exclusive, then we need to unset the current one(s) */
if (oss->mixcaps & SOUND_CAP_EXCL_INPUT) {
GList *channel;
for (channel = oss->channellist; channel != NULL; channel = channel->next) {
GstMixerChannel *turn = (GstMixerChannel *) channel->data;
turn->flags &= ~GST_MIXER_CHANNEL_RECORD;
}
oss->recdevs = 0;
}
/* set new record bit, if needed */
if (record) {
oss->recdevs |= (1 << osschannel->channel_num);
} else {
oss->recdevs &= ~(1 << osschannel->channel_num);
}
/* set it to the device */
if (ioctl(oss->mixer_fd, SOUND_MIXER_WRITE_RECSRC, &oss->recdevs) < 0) {
g_warning("Error setting mixer recording devices (0x%x): %s",
oss->recdevs, strerror(errno));
return;
}
if (record) {
channel->flags |= GST_MIXER_CHANNEL_RECORD;
} else {
channel->flags &= ~GST_MIXER_CHANNEL_RECORD;
}
}
void
gst_ossmixer_build_list (GstOssElement *oss)
{
gint i, devmask;
g_return_if_fail (oss->mixer_fd == -1);
oss->mixer_fd = open (oss->mixer_dev, O_RDWR);
if (oss->mixer_fd == -1) {
g_warning ("Failed to open mixer device %s, mixing disabled: %s",
oss->mixer_dev, strerror (errno));
return;
}
/* get masks */
ioctl (oss->mixer_fd, SOUND_MIXER_READ_RECMASK, &oss->recmask);
ioctl (oss->mixer_fd, SOUND_MIXER_READ_RECSRC, &oss->recdevs);
ioctl (oss->mixer_fd, SOUND_MIXER_READ_STEREODEVS, &oss->stereomask);
ioctl (oss->mixer_fd, SOUND_MIXER_READ_DEVMASK, &devmask);
ioctl (oss->mixer_fd, SOUND_MIXER_READ_CAPS, &oss->mixcaps);
/* build channel list */
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
if (devmask & (1 << i)) {
GstMixerChannel *channel;
gboolean input = FALSE, stereo = FALSE, record = FALSE;
/* channel exists, make up capabilities */
if (MASK_BIT_IS_SET (oss->stereomask, i))
stereo = TRUE;
if (MASK_BIT_IS_SET (oss->recmask, i))
input = TRUE;
if (MASK_BIT_IS_SET (oss->recdevs, i))
record = TRUE;
/* add channel to list */
channel = gst_ossmixer_channel_new (oss, i, stereo ? 2 : 1,
(record ? GST_MIXER_CHANNEL_RECORD : 0) |
(input ? GST_MIXER_CHANNEL_INPUT :
GST_MIXER_CHANNEL_OUTPUT));
oss->channellist = g_list_append (oss->channellist, channel);
}
}
}
void
gst_ossmixer_free_list (GstOssElement *oss)
{
g_return_if_fail (oss->mixer_fd != -1);
g_list_foreach (oss->channellist, (GFunc) gst_ossmixer_channel_free, NULL);
g_list_free (oss->channellist);
oss->channellist = NULL;
close (oss->mixer_fd);
oss->mixer_fd = -1;
}