gstreamer/ext/alsa/gstalsadeviceprobe.c
Tim-Philipp Müller 534e0c268e ext/alsa/: Helper functions to add device probing via the GstPropertyProbe interface to a class.
Original commit message from CVS:
* ext/alsa/Makefile.am:
* ext/alsa/gstalsadeviceprobe.c:
* ext/alsa/gstalsadeviceprobe.h:
Helper functions to add device probing via the GstPropertyProbe
interface to a class.
* ext/alsa/gstalsamixer.h:
Comment out GST_ALSA_MIXER, it returns a struct that's not
used.
* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_open):
Add some debug info.
* ext/alsa/gstalsamixerelement.c:
(gst_alsa_mixer_element_interface_supported),
(gst_implements_interface_init),
(gst_alsa_mixer_element_init_interfaces),
(gst_alsa_mixer_element_class_init),
(gst_alsa_mixer_element_finalize), (gst_alsa_mixer_element_init),
(gst_alsa_mixer_element_set_property),
(gst_alsa_mixer_element_get_property),
(gst_alsa_mixer_element_change_state):
* ext/alsa/gstalsamixerelement.h:
Add 'device' and 'device-name' properties. Add GstPropertyProbe
for device handling (gnome-volume-control will need that).
2005-12-14 17:58:48 +00:00

291 lines
8 KiB
C

/* Copyright (C) 2001 CodeFactory AB
* Copyright (C) 2001 Thomas Nyberg <thomas@codefactory.se>
* Copyright (C) 2001-2002 Andy Wingo <apwingo@eos.ncsu.edu>
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
* Copyright (C) 2005 Tim-Philipp Müller <tim centricular net>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstalsadeviceprobe.h"
#include "gst/interfaces/propertyprobe.h"
#define DATA_OFFSET_QUARK \
g_quark_from_static_string ("alsa-device-probe-data-offset-quark")
#define DEVICE_PROPID_QUARK \
g_quark_from_static_string ("alsa-device-probe-device-propid-quark")
static const GList *
gst_alsa_device_property_probe_get_properties (GstPropertyProbe * probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
static GList *list = NULL;
/* well, not perfect, but better than no locking at all.
* In the worst case we leak a list node, so who cares? */
GST_CLASS_LOCK (GST_OBJECT_CLASS (klass));
if (!list) {
GParamSpec *pspec;
pspec = g_object_class_find_property (klass, "device");
list = g_list_append (NULL, pspec);
}
GST_CLASS_UNLOCK (GST_OBJECT_CLASS (klass));
return list;
}
/* yes, this is evil, but hey, it works */
static gboolean
gst_alsa_device_probe_get_data (GObject * obj, GstAlsaDeviceProbeData ** p_data,
guint * p_device_propid)
{
gpointer klass;
guint devpropid;
guint offset;
GType type;
type = G_TYPE_FROM_INSTANCE (obj);
/* in case this is a derived class ... */
while (g_type_get_qdata (type, DATA_OFFSET_QUARK) == NULL) {
type = g_type_parent (type);
g_return_val_if_fail (G_TYPE_IS_FUNDAMENTAL (type) == FALSE, FALSE);
}
offset = GPOINTER_TO_UINT (g_type_get_qdata (type, DATA_OFFSET_QUARK));
devpropid = GPOINTER_TO_UINT (g_type_get_qdata (type, DEVICE_PROPID_QUARK));
g_return_val_if_fail (offset != 0, FALSE);
g_return_val_if_fail (devpropid != 0, FALSE);
klass = G_OBJECT_GET_CLASS (obj);
*p_data = (GstAlsaDeviceProbeData *) G_STRUCT_MEMBER_P (klass, offset);
*p_device_propid = devpropid;
return TRUE;
}
static void
gst_alsa_add_device_list (GstAlsaDeviceProbeData * probe_data,
snd_pcm_stream_t stream)
{
snd_ctl_t *handle;
int card, err, dev;
snd_ctl_card_info_t *info;
snd_pcm_info_t *pcminfo;
gboolean mixer = (stream == -1);
if (stream == -1)
stream = 0;
snd_ctl_card_info_alloca (&info);
snd_pcm_info_alloca (&pcminfo);
card = -1;
if (snd_card_next (&card) < 0 || card < 0) {
/* no soundcard found */
return;
}
while (card >= 0) {
gchar name[32];
g_snprintf (name, sizeof (name), "hw:%d", card);
if ((err = snd_ctl_open (&handle, name, 0)) < 0) {
goto next_card;
}
if ((err = snd_ctl_card_info (handle, info)) < 0) {
snd_ctl_close (handle);
goto next_card;
}
if (mixer) {
probe_data->devices = g_list_append (probe_data->devices,
g_strdup (name));
} else {
dev = -1;
while (1) {
gchar *gst_device;
snd_ctl_pcm_next_device (handle, &dev);
if (dev < 0)
break;
snd_pcm_info_set_device (pcminfo, dev);
snd_pcm_info_set_subdevice (pcminfo, 0);
snd_pcm_info_set_stream (pcminfo, stream);
if ((err = snd_ctl_pcm_info (handle, pcminfo)) < 0) {
continue;
}
gst_device = g_strdup_printf ("hw:%d,%d", card, dev);
probe_data->devices = g_list_append (probe_data->devices, gst_device);
}
}
snd_ctl_close (handle);
next_card:
if (snd_card_next (&card) < 0) {
break;
}
}
}
static gboolean
gst_alsa_probe_devices (GstElementClass * klass,
GstAlsaDeviceProbeData * probe_data, gboolean check)
{
static gboolean init = FALSE;
/* I'm pretty sure ALSA has a good way to do this. However, their cool
* auto-generated documentation is pretty much useless if you try to
* do function-wise look-ups. */
if (!init && !check) {
snd_pcm_stream_t mode = -1;
const GList *templates;
/* we assume one pad template at max [zero=mixer] */
templates = gst_element_class_get_pad_template_list (klass);
if (templates) {
if (GST_PAD_TEMPLATE_DIRECTION (templates->data) == GST_PAD_SRC)
mode = SND_PCM_STREAM_CAPTURE;
else
mode = SND_PCM_STREAM_PLAYBACK;
}
gst_alsa_add_device_list (probe_data, mode);
init = TRUE;
}
return init;
}
static void
gst_alsa_device_property_probe_probe_property (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstAlsaDeviceProbeData *probe_data;
guint devid;
if (!gst_alsa_device_probe_get_data (G_OBJECT (probe), &probe_data, &devid))
g_return_if_reached ();
if (prop_id == devid) {
gst_alsa_probe_devices (GST_ELEMENT_GET_CLASS (probe), probe_data, FALSE);
} else {
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
}
}
static gboolean
gst_alsa_device_property_probe_needs_probe (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstAlsaDeviceProbeData *probe_data;
GstElementClass *klass;
guint devid;
if (!gst_alsa_device_probe_get_data (G_OBJECT (probe), &probe_data, &devid))
g_return_val_if_reached (FALSE);
if (prop_id != devid) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
return FALSE;
}
klass = GST_ELEMENT_GET_CLASS (probe);
return !gst_alsa_probe_devices (klass, probe_data, TRUE);
}
static GValueArray *
gst_alsa_device_probe_list_devices (GstAlsaDeviceProbeData * probe_data)
{
GValueArray *array;
GValue value = { 0 };
GList *item;
if (!probe_data->devices)
return NULL;
array = g_value_array_new (g_list_length (probe_data->devices));
g_value_init (&value, G_TYPE_STRING);
for (item = probe_data->devices; item != NULL; item = item->next) {
g_value_set_string (&value, (const gchar *) item->data);
g_value_array_append (array, &value);
}
g_value_unset (&value);
return array;
}
static GValueArray *
gst_alsa_device_property_probe_get_values (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstAlsaDeviceProbeData *probe_data;
guint devid;
if (!gst_alsa_device_probe_get_data (G_OBJECT (probe), &probe_data, &devid))
g_return_val_if_reached (NULL);
if (prop_id != devid) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
return NULL;
}
return gst_alsa_device_probe_list_devices (probe_data);
}
static void
gst_alsa_property_probe_interface_init (GstPropertyProbeInterface * iface)
{
iface->get_properties = gst_alsa_device_property_probe_get_properties;
iface->probe_property = gst_alsa_device_property_probe_probe_property;
iface->needs_probe = gst_alsa_device_property_probe_needs_probe;
iface->get_values = gst_alsa_device_property_probe_get_values;
}
void
gst_alsa_type_add_device_property_probe_interface (GType type,
guint probe_data_klass_offset, guint device_prop_id)
{
static const GInterfaceInfo probe_iface_info = {
(GInterfaceInitFunc) gst_alsa_property_probe_interface_init,
NULL,
NULL,
};
g_assert (probe_data_klass_offset != 0);
g_assert (device_prop_id != 0);
g_type_set_qdata (type, DATA_OFFSET_QUARK,
GUINT_TO_POINTER (probe_data_klass_offset));
g_type_set_qdata (type, DEVICE_PROPID_QUARK,
GUINT_TO_POINTER (device_prop_id));
g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
&probe_iface_info);
}