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gstreamer/sys/oss/gstosselement.c
Ronald S. Bultje bac7d40601 Move over from GstInterface to GstImplementsInterface. Also adds some signals to several interfaces 
Original commit message from CVS:
Move over from GstInterface to GstImplementsInterface. Also adds some signals to several interfaces
2003-12-07 12:11:29 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstosssink.c:
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <gst/propertyprobe/propertyprobe.h>
#include "gstosselement.h"
#include "gstossmixer.h"
enum {
ARG_0,
ARG_DEVICE,
ARG_MIXERDEV,
ARG_DEVICE_NAME,
};
/* elementfactory information */
static GstElementDetails gst_osselement_details = GST_ELEMENT_DETAILS (
"Audio Mixer (OSS)",
"Generic/Audio",
"OSS-based mixer element",
"Ronald Bultje <rbultje@ronald.bitfreak.net>"
);
static void gst_osselement_base_init (GstOssElementClass *klass);
static void gst_osselement_class_init (GstOssElementClass *klass);
static void gst_ossprobe_interface_init (GstPropertyProbeInterface *iface);
static void gst_osselement_init (GstOssElement *oss);
static void gst_osselement_dispose (GObject *object);
static void gst_osselement_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_osselement_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static GstElementStateReturn gst_osselement_change_state (GstElement *element);
static GstElementClass *parent_class = NULL;
/*static guint gst_osssrc_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_osselement_get_type (void)
{
static GType osselement_type = 0;
if (!osselement_type) {
static const GTypeInfo osselement_info = {
sizeof(GstOssElementClass),
(GBaseInitFunc)gst_osselement_base_init,
NULL,
(GClassInitFunc)gst_osselement_class_init,
NULL,
NULL,
sizeof(GstOssElement),
0,
(GInstanceInitFunc)gst_osselement_init,
};
static const GInterfaceInfo ossiface_info = {
(GInterfaceInitFunc) gst_oss_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo ossmixer_info = {
(GInterfaceInitFunc) gst_ossmixer_interface_init,
NULL,
NULL,
};
static const GInterfaceInfo ossprobe_info = {
(GInterfaceInitFunc) gst_ossprobe_interface_init,
NULL,
NULL,
};
osselement_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstOssElement",
&osselement_info, 0);
g_type_add_interface_static (osselement_type,
GST_TYPE_IMPLEMENTS_INTERFACE,
&ossiface_info);
g_type_add_interface_static (osselement_type,
GST_TYPE_MIXER,
&ossmixer_info);
g_type_add_interface_static (osselement_type,
GST_TYPE_PROPERTY_PROBE,
&ossprobe_info);
}
return osselement_type;
}
static void
gst_osselement_base_init (GstOssElementClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
klass->device_combinations = NULL;
gst_element_class_set_details (element_class, &gst_osselement_details);
}
static void
gst_osselement_class_init (GstOssElementClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE,
g_param_spec_string ("device", "Device", "OSS device (/dev/dspN usually)",
"default", G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_MIXERDEV,
g_param_spec_string ("mixerdev", "Mixer device",
"OSS mixer device (/dev/mixerN usually)",
"default", G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_DEVICE_NAME,
g_param_spec_string ("device_name", "Device name", "Name of the device",
NULL, G_PARAM_READABLE));
gobject_class->set_property = gst_osselement_set_property;
gobject_class->get_property = gst_osselement_get_property;
gobject_class->dispose = gst_osselement_dispose;
gstelement_class->change_state = gst_osselement_change_state;
}
static const GList *
gst_ossprobe_get_properties (GstPropertyProbe *probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
static GList *list = NULL;
if (!list) {
list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
}
return list;
}
static void
gst_osselement_probe (gchar *device_base,
gint device_num,
gchar **put)
{
gchar *device;
struct stat s;
/* only if yet unfilled */
if (*put != NULL)
return;
if (device_num == 0)
device = g_strdup (device_base);
else
device = g_strdup_printf ("%s%d", device_base, device_num);
if (lstat (device, &s) || !S_ISCHR (s.st_mode))
goto end;
*put = device;
return;
end:
g_free (device);
}
static gboolean
gst_osselement_class_probe_devices (GstOssElementClass *klass,
gboolean check)
{
static gboolean init = FALSE;
static GList *device_combinations;
if (!init && !check) {
gchar *dsp_base[] = { "/dev/dsp", "/dev/sound/dsp", NULL };
gchar *mixer_base[] = { "/dev/mixer", "/dev/sound/mixer", NULL };
GstOssDeviceCombination devices[16];
gint n;
while (device_combinations) {
GList *item = device_combinations;
GstOssDeviceCombination *combi = item->data;
device_combinations = g_list_remove (device_combinations, item);
g_free (combi->dsp);
g_free (combi->mixer);
g_free (combi);
}
/* probe for all /dev entries */
memset (devices, 0, sizeof (devices));
/* OSS (without devfs) allows at max. 16 devices */
for (n = 0; n < 16; n++) {
gint base;
for (base = 0; dsp_base[base] != NULL; base++)
gst_osselement_probe (dsp_base[base], n, &devices[n].dsp);
for (base = 0; mixer_base[base] != NULL; base++)
gst_osselement_probe (mixer_base[base], n, &devices[n].mixer);
}
/* does the device exist (can we open them)? */
for (n = 0; n < 16; n++) {
gint fd;
if (!devices[n].dsp)
continue;
/* we just check the dsp. we assume the mixer always works.
* we don't need a mixer anyway (says OSS)... */
if ((fd = open (devices[n].dsp, O_RDONLY)) > 0 || errno == EBUSY) {
GstOssDeviceCombination *combi;
if (fd > 0)
close (fd);
/* yay! \o/ */
combi = g_new0 (GstOssDeviceCombination, 1);
combi->dsp = devices[n].dsp;
combi->mixer = devices[n].mixer;
devices[n].dsp = devices[n].mixer = NULL;
device_combinations = g_list_append (device_combinations, combi);
}
}
/* free */
for (n = 0; n < 16; n++) {
if (devices[n].dsp)
g_free (devices[n].dsp);
if (devices[n].mixer)
g_free (devices[n].mixer);
}
init = TRUE;
}
klass->device_combinations = device_combinations;
return init;
}
static GValueArray *
gst_osselement_class_list_devices (GstOssElementClass *klass)
{
GValueArray *array;
GValue value = { 0 };
GList *item;
if (!klass->device_combinations)
return NULL;
array = g_value_array_new (g_list_length (klass->device_combinations));
item = klass->device_combinations;
g_value_init (&value, G_TYPE_STRING);
while (item) {
GstOssDeviceCombination *combi = item->data;
g_value_set_string (&value, combi->dsp);
g_value_array_append (array, &value);
item = item->next;
}
g_value_unset (&value);
return array;
}
static void
gst_ossprobe_probe_property (GstPropertyProbe *probe,
guint prop_id,
const GParamSpec *pspec)
{
GstOssElementClass *klass = GST_OSSELEMENT_GET_CLASS (probe);
switch (prop_id) {
case ARG_DEVICE:
gst_osselement_class_probe_devices (klass, FALSE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
}
static gboolean
gst_ossprobe_needs_probe (GstPropertyProbe *probe,
guint prop_id,
const GParamSpec *pspec)
{
GstOssElementClass *klass = GST_OSSELEMENT_GET_CLASS (probe);
gboolean ret = FALSE;
switch (prop_id) {
case ARG_DEVICE:
ret = !gst_osselement_class_probe_devices (klass, TRUE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return ret;
}
static GValueArray *
gst_ossprobe_get_values (GstPropertyProbe *probe,
guint prop_id,
const GParamSpec *pspec)
{
GstOssElementClass *klass = GST_OSSELEMENT_GET_CLASS (probe);
GValueArray *array = NULL;
switch (prop_id) {
case ARG_DEVICE:
array = gst_osselement_class_list_devices (klass);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return array;
}
static void
gst_ossprobe_interface_init (GstPropertyProbeInterface *iface)
{
iface->get_properties = gst_ossprobe_get_properties;
iface->probe_property = gst_ossprobe_probe_property;
iface->needs_probe = gst_ossprobe_needs_probe;
iface->get_values = gst_ossprobe_get_values;
}
static void
gst_osselement_init (GstOssElement *oss)
{
oss->device = g_strdup ("/dev/dsp");
oss->mixer_dev = g_strdup ("/dev/mixer");
oss->fd = -1;
oss->mixer_fd = -1;
oss->tracklist = NULL;
oss->device_name = NULL;
gst_osselement_reset (oss);
}
static void
gst_osselement_dispose (GObject *object)
{
GstOssElement *oss = (GstOssElement *) object;
g_free (oss->device);
g_free (oss->mixer_dev);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
void
gst_osselement_reset (GstOssElement *oss)
{
oss->law = 0;
oss->endianness = G_BYTE_ORDER;
oss->sign = TRUE;
oss->width = 16;
oss->depth = 16;
oss->channels = 2;
oss->rate = 44100;
oss->fragment = 6;
oss->bps = 0;
/* AFMT_*_BE not available on all OSS includes (e.g. FBSD) */
#ifdef WORDS_BIGENDIAN
oss->format = AFMT_S16_BE;
#else
oss->format = AFMT_S16_LE;
#endif /* WORDS_BIGENDIAN */
}
static gboolean
gst_ossformat_get (gint law, gint endianness, gboolean sign, gint width, gint depth,
gint *format, gint *bps)
{
if (width != depth)
return FALSE;
*bps = 1;
if (law == 0) {
if (width == 16) {
if (sign == TRUE) {
if (endianness == G_LITTLE_ENDIAN) {
*format = AFMT_S16_LE;
GST_DEBUG (
"16 bit signed LE, no law (%d)", *format);
}
else if (endianness == G_BIG_ENDIAN) {
*format = AFMT_S16_BE;
GST_DEBUG (
"16 bit signed BE, no law (%d)", *format);
}
}
else {
if (endianness == G_LITTLE_ENDIAN) {
*format = AFMT_U16_LE;
GST_DEBUG (
"16 bit unsigned LE, no law (%d)", *format);
}
else if (endianness == G_BIG_ENDIAN) {
*format = AFMT_U16_BE;
GST_DEBUG (
"16 bit unsigned BE, no law (%d)", *format);
}
}
*bps = 2;
}
else if (width == 8) {
if (sign == TRUE) {
*format = AFMT_S8;
GST_DEBUG (
"8 bit signed, no law (%d)", *format);
}
else {
*format = AFMT_U8;
GST_DEBUG (
"8 bit unsigned, no law (%d)", *format);
}
*bps = 1;
}
} else if (law == 1) {
*format = AFMT_MU_LAW;
GST_DEBUG (
"mu law (%d)", *format);
} else if (law == 2) {
*format = AFMT_A_LAW;
GST_DEBUG (
"a law (%d)", *format);
} else {
g_critical ("unknown law");
return FALSE;
}
return TRUE;
}
gboolean
gst_osselement_parse_caps (GstOssElement *oss, GstCaps *caps)
{
gint bps, format;
gst_caps_get_int (caps, "width", &oss->width);
gst_caps_get_int (caps, "depth", &oss->depth);
if (oss->width != oss->depth)
return FALSE;
gst_caps_get_int (caps, "law", &oss->law);
gst_caps_get_int (caps, "endianness", &oss->endianness);
gst_caps_get_boolean (caps, "signed", &oss->sign);
if (!gst_ossformat_get (oss->law, oss->endianness, oss->sign,
oss->width, oss->depth, &format, &bps))
{
GST_DEBUG ("could not get format");
return FALSE;
}
gst_caps_get_int (caps, "channels", &oss->channels);
gst_caps_get_int (caps, "rate", &oss->rate);
oss->bps = bps * oss->channels * oss->rate;
oss->format = format;
return TRUE;
}
#define GET_FIXED_INT(caps, name, dest) \
G_STMT_START { \
if (gst_caps_has_fixed_property (caps, name)) \
gst_caps_get_int (caps, name, dest); \
} G_STMT_END
#define GET_FIXED_BOOLEAN(caps, name, dest) \
G_STMT_START { \
if (gst_caps_has_fixed_property (caps, name)) \
gst_caps_get_boolean (caps, name, dest); \
} G_STMT_END
gboolean
gst_osselement_merge_fixed_caps (GstOssElement *oss, GstCaps *caps)
{
gint bps, format;
/* peel off fixed stuff from the caps */
GET_FIXED_INT (caps, "law", &oss->law);
GET_FIXED_INT (caps, "endianness", &oss->endianness);
GET_FIXED_BOOLEAN (caps, "signed", &oss->sign);
GET_FIXED_INT (caps, "width", &oss->width);
GET_FIXED_INT (caps, "depth", &oss->depth);
if (!gst_ossformat_get (oss->law, oss->endianness, oss->sign,
oss->width, oss->depth, &format, &bps))
{
return FALSE;
}
GET_FIXED_INT (caps, "rate", &oss->rate);
GET_FIXED_INT (caps, "channels", &oss->channels);
oss->bps = bps * oss->channels * oss->rate;
oss->format = format;
return TRUE;
}
gboolean
gst_osselement_sync_parms (GstOssElement *oss)
{
audio_buf_info space;
int frag;
gint target_format;
gint target_channels;
gint target_rate;
gint fragscale, frag_ln;
if (oss->fd == -1)
return FALSE;
if (oss->fragment >> 16)
frag = oss->fragment;
else
frag = 0x7FFF0000 | oss->fragment;
GST_INFO ("osselement: setting sound card to %dHz %d format %s (%08x fragment)",
oss->rate, oss->format,
(oss->channels == 2) ? "stereo" : "mono", frag);
ioctl (oss->fd, SNDCTL_DSP_SETFRAGMENT, &frag);
ioctl (oss->fd, SNDCTL_DSP_RESET, 0);
target_format = oss->format;
target_channels = oss->channels;
target_rate = oss->rate;
ioctl (oss->fd, SNDCTL_DSP_SETFMT, &oss->format);
ioctl (oss->fd, SNDCTL_DSP_CHANNELS, &oss->channels);
ioctl (oss->fd, SNDCTL_DSP_SPEED, &oss->rate);
ioctl (oss->fd, SNDCTL_DSP_GETBLKSIZE, &oss->fragment_size);
if (oss->mode == GST_OSSELEMENT_WRITE) {
ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &space);
}
else {
ioctl (oss->fd, SNDCTL_DSP_GETISPACE, &space);
}
/* calculate new fragment using a poor man's logarithm function */
fragscale = 1;
frag_ln = 0;
while (fragscale < space.fragsize) {
fragscale <<= 1;
frag_ln++;
}
oss->fragment = space.fragstotal << 16 | frag_ln;
GST_INFO ("osselement: set sound card to %dHz, %d format, %s "
"(%d bytes buffer, %08x fragment)",
oss->rate, oss->format,
(oss->channels == 2) ? "stereo" : "mono",
space.bytes, oss->fragment);
oss->fragment_time = (GST_SECOND * oss->fragment_size) / oss->bps;
GST_INFO ("fragment time %u %" G_GUINT64_FORMAT "\n",
oss->bps, oss->fragment_time);
if (target_format != oss->format ||
target_channels != oss->channels ||
target_rate != oss->rate)
{
g_warning ("couldn't set requested OSS parameters, enjoy the noise :)");
/* we could eventually return FALSE here, or just do some additional tests
* to see that the frequencies don't differ too much etc.. */
}
return TRUE;
}
static gboolean
gst_osselement_open_audio (GstOssElement *oss)
{
gint caps;
GstOssOpenMode mode = GST_OSSELEMENT_READ;
const GList *padlist;
g_return_val_if_fail (oss->fd == -1, FALSE);
GST_INFO ("osselement: attempting to open sound device");
/* Ok, so how do we open the device? We assume that we have (max.) one
* pad, and if this is a sinkpad, we're osssink (w). else, we're osssrc (r) */
padlist = gst_element_get_pad_list (GST_ELEMENT (oss));
if (padlist != NULL) {
GstPad *firstpad = padlist->data;
if (GST_PAD_IS_SINK (firstpad)) {
mode = GST_OSSELEMENT_WRITE;
}
} else {
goto do_mixer;
}
/* first try to open the sound card */
if (mode == GST_OSSELEMENT_WRITE) {
/* open non blocking first so that it returns immediatly with an error
* when we cannot get to the device */
oss->fd = open (oss->device, O_WRONLY | O_NONBLOCK);
if (oss->fd >= 0) {
close (oss->fd);
/* re-open the sound device in blocking mode */
oss->fd = open (oss->device, O_WRONLY);
}
}
else {
oss->fd = open (oss->device, O_RDONLY);
}
if (oss->fd < 0) {
switch (errno) {
case EBUSY:
gst_element_error (GST_ELEMENT (oss),
"osselement: Unable to open %s (in use ?)",
oss->device);
break;
case EISDIR:
gst_element_error (GST_ELEMENT (oss),
"osselement: Device %s is a directory",
oss->device);
break;
case EACCES:
case ETXTBSY:
gst_element_error (GST_ELEMENT (oss),
"osselement: Cannot access %s, check permissions",
oss->device);
break;
case ENXIO:
case ENODEV:
case ENOENT:
gst_element_error (GST_ELEMENT (oss),
"osselement: Cannot access %s, does it exist ?",
oss->device);
break;
case EROFS:
gst_element_error (GST_ELEMENT (oss),
"osselement: Cannot access %s, read-only filesystem ?",
oss->device);
default:
/* FIXME: strerror is not threadsafe */
gst_element_error (GST_ELEMENT (oss),
"osselement: Cannot open %s, generic error: %s",
oss->device, strerror (errno));
break;
}
return FALSE;
}
oss->mode = mode;
/* we have it, set the default parameters and go have fun */
/* set card state */
ioctl (oss->fd, SNDCTL_DSP_GETCAPS, &caps);
GST_INFO ("osselement: Capabilities %08x", caps);
if (caps & DSP_CAP_DUPLEX) GST_INFO ( "osselement: Full duplex");
if (caps & DSP_CAP_REALTIME) GST_INFO ( "osselement: Realtime");
if (caps & DSP_CAP_BATCH) GST_INFO ( "osselement: Batch");
if (caps & DSP_CAP_COPROC) GST_INFO ( "osselement: Has coprocessor");
if (caps & DSP_CAP_TRIGGER) GST_INFO ( "osselement: Trigger");
if (caps & DSP_CAP_MMAP) GST_INFO ( "osselement: Direct access");
#ifdef DSP_CAP_MULTI
if (caps & DSP_CAP_MULTI) GST_INFO ( "osselement: Multiple open");
#endif /* DSP_CAP_MULTI */
#ifdef DSP_CAP_BIND
if (caps & DSP_CAP_BIND) GST_INFO ( "osselement: Channel binding");
#endif /* DSP_CAP_BIND */
ioctl(oss->fd, SNDCTL_DSP_GETFMTS, &caps);
GST_INFO ( "osselement: Formats %08x", caps);
if (caps & AFMT_MU_LAW) GST_INFO ( "osselement: MU_LAW");
if (caps & AFMT_A_LAW) GST_INFO ( "osselement: A_LAW");
if (caps & AFMT_IMA_ADPCM) GST_INFO ( "osselement: IMA_ADPCM");
if (caps & AFMT_U8) GST_INFO ( "osselement: U8");
if (caps & AFMT_S16_LE) GST_INFO ( "osselement: S16_LE");
if (caps & AFMT_S16_BE) GST_INFO ( "osselement: S16_BE");
if (caps & AFMT_S8) GST_INFO ( "osselement: S8");
if (caps & AFMT_U16_LE) GST_INFO ( "osselement: U16_LE");
if (caps & AFMT_U16_BE) GST_INFO ( "osselement: U16_BE");
if (caps & AFMT_MPEG) GST_INFO ( "osselement: MPEG");
#ifdef AFMT_AC3
if (caps & AFMT_AC3) GST_INFO ( "osselement: AC3");
#endif
GST_INFO ("osselement: opened audio (%s) with fd=%d",
oss->device, oss->fd);
oss->caps = caps;
do_mixer:
gst_ossmixer_build_list (oss);
return TRUE;
}
static void
gst_osselement_close_audio (GstOssElement *oss)
{
gst_ossmixer_free_list (oss);
if (oss->fd < 0)
return;
close(oss->fd);
oss->fd = -1;
}
gboolean
gst_osselement_convert (GstOssElement *oss,
GstFormat src_format,
gint64 src_value,
GstFormat *dest_format,
gint64 *dest_value)
{
gboolean res = TRUE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
if (oss->bps == 0 || oss->channels == 0 || oss->width == 0)
return FALSE;
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * GST_SECOND / oss->bps;
break;
case GST_FORMAT_DEFAULT:
*dest_value = src_value / (oss->channels * oss->width);
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
*dest_value = src_value * oss->bps / GST_SECOND;
break;
case GST_FORMAT_DEFAULT:
*dest_value = src_value * oss->rate / GST_SECOND;
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * GST_SECOND / oss->rate;
break;
case GST_FORMAT_BYTES:
*dest_value = src_value * oss->channels * oss->width;
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static void
gst_osselement_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstOssElement *oss = GST_OSSELEMENT (object);
switch (prop_id) {
case ARG_DEVICE:
/* disallow changing the device while it is opened
get_property("device") should return the right one */
if (gst_element_get_state (GST_ELEMENT (oss)) == GST_STATE_NULL) {
g_free (oss->device);
oss->device = g_strdup (g_value_get_string (value));
/* let's assume that if we have a device map for the mixer,
* we're allowed to do all that automagically here */
if (GST_OSSELEMENT_GET_CLASS (oss)->device_combinations != NULL) {
GList *list = GST_OSSELEMENT_GET_CLASS (oss)->device_combinations;
while (list) {
GstOssDeviceCombination *combi = list->data;
if (!strcmp (combi->dsp, oss->device)) {
g_free (oss->mixer_dev);
oss->mixer_dev = g_strdup (combi->mixer);
break;
}
list = list->next;
}
}
}
break;
case ARG_MIXERDEV:
/* disallow changing the device while it is opened
get_property("mixerdev") should return the right one */
if (gst_element_get_state (GST_ELEMENT (oss)) == GST_STATE_NULL) {
g_free (oss->mixer_dev);
oss->mixer_dev = g_strdup (g_value_get_string (value));
}
break;
default:
break;
}
}
static void
gst_osselement_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstOssElement *oss = GST_OSSELEMENT (object);
switch (prop_id) {
case ARG_DEVICE:
g_value_set_string (value, oss->device);
break;
case ARG_MIXERDEV:
g_value_set_string (value, oss->mixer_dev);
break;
case ARG_DEVICE_NAME:
g_value_set_string (value, oss->device_name);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_osselement_change_state (GstElement *element)
{
GstOssElement *oss = GST_OSSELEMENT (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
if (!gst_osselement_open_audio (oss)) {
return GST_STATE_FAILURE;
}
GST_INFO ("osselement: opened sound device");
break;
case GST_STATE_READY_TO_NULL:
gst_osselement_close_audio (oss);
gst_osselement_reset (oss);
GST_INFO ("osselement: closed sound device");
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
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