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don't abuse the class lock but use a new static lock for protecting the probed list of devices.
210 lines
5.5 KiB
C
210 lines
5.5 KiB
C
/* Copyright (C) 2001 CodeFactory AB
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* Copyright (C) 2001 Thomas Nyberg <thomas@codefactory.se>
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* Copyright (C) 2001-2002 Andy Wingo <apwingo@eos.ncsu.edu>
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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* Copyright (C) 2005 Tim-Philipp Müller <tim centricular net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstalsadeviceprobe.h"
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#include "gst/interfaces/propertyprobe.h"
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G_LOCK_DEFINE_STATIC (probe_lock);
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static const GList *
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gst_alsa_device_property_probe_get_properties (GstPropertyProbe * probe)
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{
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GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
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static GList *list = NULL;
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G_LOCK (probe_lock);
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if (!list) {
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GParamSpec *pspec;
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pspec = g_object_class_find_property (klass, "device");
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list = g_list_append (NULL, pspec);
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}
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G_UNLOCK (probe_lock);
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return list;
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}
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static GList *
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gst_alsa_get_device_list (snd_pcm_stream_t stream)
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{
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snd_ctl_t *handle;
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int card, dev;
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snd_ctl_card_info_t *info;
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snd_pcm_info_t *pcminfo;
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gboolean mixer = (stream == -1);
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GList *list = NULL;
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if (stream == -1)
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stream = 0;
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snd_ctl_card_info_malloc (&info);
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snd_pcm_info_malloc (&pcminfo);
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card = -1;
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if (snd_card_next (&card) < 0 || card < 0) {
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/* no soundcard found */
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GST_WARNING ("No soundcard found");
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goto beach;
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}
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while (card >= 0) {
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gchar name[32];
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g_snprintf (name, sizeof (name), "hw:%d", card);
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if (snd_ctl_open (&handle, name, 0) < 0) {
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goto next_card;
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}
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if (snd_ctl_card_info (handle, info) < 0) {
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snd_ctl_close (handle);
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goto next_card;
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}
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if (mixer) {
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list = g_list_append (list, g_strdup (name));
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} else {
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dev = -1;
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while (1) {
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gchar *gst_device;
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snd_ctl_pcm_next_device (handle, &dev);
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if (dev < 0)
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break;
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snd_pcm_info_set_device (pcminfo, dev);
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snd_pcm_info_set_subdevice (pcminfo, 0);
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snd_pcm_info_set_stream (pcminfo, stream);
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if (snd_ctl_pcm_info (handle, pcminfo) < 0) {
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continue;
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}
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gst_device = g_strdup_printf ("hw:%d,%d", card, dev);
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list = g_list_append (list, gst_device);
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}
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}
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snd_ctl_close (handle);
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next_card:
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if (snd_card_next (&card) < 0) {
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break;
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}
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}
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beach:
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snd_ctl_card_info_free (info);
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snd_pcm_info_free (pcminfo);
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return list;
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}
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static void
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gst_alsa_device_property_probe_probe_property (GstPropertyProbe * probe,
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guint prop_id, const GParamSpec * pspec)
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{
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if (!g_str_equal (pspec->name, "device")) {
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G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
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}
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}
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static gboolean
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gst_alsa_device_property_probe_needs_probe (GstPropertyProbe * probe,
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guint prop_id, const GParamSpec * pspec)
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{
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/* don't cache probed data */
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return TRUE;
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}
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static GValueArray *
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gst_alsa_device_property_probe_get_values (GstPropertyProbe * probe,
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guint prop_id, const GParamSpec * pspec)
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{
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GstElementClass *klass;
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const GList *templates;
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snd_pcm_stream_t mode = -1;
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GValueArray *array;
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GValue value = { 0, };
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GList *l, *list;
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if (!g_str_equal (pspec->name, "device")) {
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G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
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return NULL;
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}
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klass = GST_ELEMENT_GET_CLASS (GST_ELEMENT (probe));
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/* I'm pretty sure ALSA has a good way to do this. However, their cool
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* auto-generated documentation is pretty much useless if you try to
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* do function-wise look-ups. */
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/* we assume one pad template at max [zero=mixer] */
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templates = gst_element_class_get_pad_template_list (klass);
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if (templates) {
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if (GST_PAD_TEMPLATE_DIRECTION (templates->data) == GST_PAD_SRC)
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mode = SND_PCM_STREAM_CAPTURE;
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else
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mode = SND_PCM_STREAM_PLAYBACK;
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}
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list = gst_alsa_get_device_list (mode);
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if (list == NULL) {
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GST_LOG_OBJECT (probe, "No devices found");
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return NULL;
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}
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array = g_value_array_new (g_list_length (list));
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g_value_init (&value, G_TYPE_STRING);
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for (l = list; l != NULL; l = l->next) {
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GST_LOG_OBJECT (probe, "Found device: %s", (gchar *) l->data);
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g_value_take_string (&value, (gchar *) l->data);
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l->data = NULL;
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g_value_array_append (array, &value);
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}
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g_value_unset (&value);
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g_list_free (list);
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return array;
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}
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static void
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gst_alsa_property_probe_interface_init (GstPropertyProbeInterface * iface)
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{
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iface->get_properties = gst_alsa_device_property_probe_get_properties;
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iface->probe_property = gst_alsa_device_property_probe_probe_property;
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iface->needs_probe = gst_alsa_device_property_probe_needs_probe;
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iface->get_values = gst_alsa_device_property_probe_get_values;
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}
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void
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gst_alsa_type_add_device_property_probe_interface (GType type)
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{
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static const GInterfaceInfo probe_iface_info = {
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(GInterfaceInitFunc) gst_alsa_property_probe_interface_init,
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NULL,
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NULL,
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};
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g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
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&probe_iface_info);
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}
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