mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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304 lines
8.1 KiB
C
304 lines
8.1 KiB
C
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/* GStreamer
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* Copyright (C) 2023 Matthieu Volat <matthieu.volat@ensimag.fr>
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*
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* ossdeviceprovider.c: OSS device probing and monitoring
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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
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 "gstossdeviceprovider.h"
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#include "gstosshelper.h"
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#include <glib/gstdio.h>
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#include <gst/gst.h>
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#include <fcntl.h>
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#include <unistd.h>
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static GstDevice *gst_oss_device_new (const gchar * device_name, GstCaps * caps,
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const gchar * device, GstOssDeviceType type);
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G_DEFINE_TYPE (GstOssDeviceProvider, gst_oss_device_provider,
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GST_TYPE_DEVICE_PROVIDER);
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static GstDevice *
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add_device (GstDeviceProvider * provider, GstOssDeviceType type, gint devno)
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{
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gchar devpath[64];
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gchar mixpath[64];
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gint fd;
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GstCaps *caps;
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gchar *name;
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GstDevice *device;
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snprintf (devpath, sizeof (devpath), "/dev/dsp%u", devno);
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snprintf (mixpath, sizeof (mixpath), "/dev/mixer%u", devno);
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switch (type) {
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case GST_OSS_DEVICE_TYPE_SOURCE:
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fd = open (devpath, O_RDONLY);
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break;
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case GST_OSS_DEVICE_TYPE_SINK:
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fd = open (devpath, O_WRONLY);
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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if (fd == -1) {
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GST_WARNING_OBJECT (provider, "Could open device %s for introspection",
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devpath);
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return NULL;
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}
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caps = gst_oss_helper_probe_caps (fd);
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close (fd);
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name = gst_oss_helper_get_card_name (mixpath);
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device = gst_oss_device_new (name, caps, devpath, type);
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g_free (name);
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return device;
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}
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static GList *
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gst_oss_device_provider_probe (GstDeviceProvider * provider)
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{
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FILE *sndstat_handle;
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gchar *sndstat_line = NULL;
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size_t sndstat_line_len = 0;
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gint sndstat_device_section = 0;
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gint ossdevno;
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gboolean play, rec;
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GstDevice *device;
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GList *list = NULL;
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GST_INFO_OBJECT (provider, "Probing OSS devices");
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if (((sndstat_handle = fopen ("/dev/sndstat", "r")) == NULL)
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&& ((sndstat_handle = fopen ("/proc/sndstat", "r")) == NULL)
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&& ((sndstat_handle = fopen ("/proc/asound/sndstat", "r")) == NULL)) {
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/* Cannot evaluate OSS devices without this file */
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GST_WARNING_OBJECT (provider, "No sndstat file found");
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goto beach;
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}
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while (!feof (sndstat_handle)) {
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if (getline (&sndstat_line, &sndstat_line_len, sndstat_handle) == -1) {
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break;
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}
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g_strstrip (sndstat_line);
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if (!sndstat_device_section) {
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sndstat_device_section = g_str_equal (sndstat_line, "Audio devices:")
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|| g_str_equal (sndstat_line, "Installed devices:")
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|| g_str_equal (sndstat_line, "Installed devices from userspace:");
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continue;
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}
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if ((sscanf (sndstat_line, "pcm%u:", &ossdevno) == 1)
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|| (sscanf (sndstat_line, "%u:", &ossdevno) == 1)) {
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/* At least on FreeBSD, these keywords can be different if hw.snd.verbose is not 0 */
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if (strstr (sndstat_line, "(play/rec)") != NULL) {
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play = rec = TRUE;
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} else if (strstr (sndstat_line, "(play)") != NULL) {
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play = TRUE, rec = FALSE;
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} else if (strstr (sndstat_line, "(rec)") != NULL) {
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play = FALSE, rec = TRUE;
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} else {
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play = rec = FALSE; /* Or should we assume play/rec? */
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}
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if (play) {
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device = add_device (provider, GST_OSS_DEVICE_TYPE_SINK, ossdevno);
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if (device != NULL) {
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list = g_list_append (list, device);
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}
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}
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if (rec) {
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device = add_device (provider, GST_OSS_DEVICE_TYPE_SOURCE, ossdevno);
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if (device != NULL) {
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list = g_list_append (list, device);
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}
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}
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}
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}
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free (sndstat_line);
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fclose (sndstat_handle);
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beach:
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return list;
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}
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static void
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gst_oss_device_provider_class_init (GstOssDeviceProviderClass * klass)
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{
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GstDeviceProviderClass *dm_class = GST_DEVICE_PROVIDER_CLASS (klass);
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dm_class->probe = gst_oss_device_provider_probe;
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gst_device_provider_class_set_static_metadata (dm_class,
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"OSS Device Provider", "Sink/Source/Audio",
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"List and provides OSS source and sink devices",
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"Matthieu Volat <matthieu.volat@ensimag.fr>");
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}
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static void
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gst_oss_device_provider_init (GstOssDeviceProvider * self)
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{
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}
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/*** GstOssDevice implementation ******/
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enum
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{
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PROP_DEVICE_PATH = 1,
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};
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G_DEFINE_TYPE (GstOssDevice, gst_oss_device, GST_TYPE_DEVICE);
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static GstElement *
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gst_oss_device_create_element (GstDevice * device, const gchar * name)
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{
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GstOssDevice *oss_dev = GST_OSS_DEVICE (device);
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GstElement *elem;
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elem = gst_element_factory_make (oss_dev->element, name);
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g_object_set (elem, "device", oss_dev->device_path, NULL);
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return elem;
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}
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static gboolean
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gst_oss_device_reconfigure_element (GstDevice * device, GstElement * element)
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{
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GstOssDevice *oss_dev = GST_OSS_DEVICE (device);
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g_object_set (element, "device", oss_dev->device_path, NULL);
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return TRUE;
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}
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static void
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gst_oss_device_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstOssDevice *device;
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device = GST_OSS_DEVICE_CAST (object);
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switch (prop_id) {
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case PROP_DEVICE_PATH:
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g_value_set_string (value, device->device_path);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_oss_device_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstOssDevice *device;
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device = GST_OSS_DEVICE_CAST (object);
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switch (prop_id) {
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case PROP_DEVICE_PATH:
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device->device_path = g_value_dup_string (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_oss_device_finalize (GObject * object)
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{
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GstOssDevice *device = GST_OSS_DEVICE (object);
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g_free (device->device_path);
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G_OBJECT_CLASS (gst_oss_device_parent_class)->finalize (object);
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}
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static void
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gst_oss_device_class_init (GstOssDeviceClass * klass)
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{
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GstDeviceClass *dev_class = GST_DEVICE_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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dev_class->create_element = gst_oss_device_create_element;
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dev_class->reconfigure_element = gst_oss_device_reconfigure_element;
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object_class->get_property = gst_oss_device_get_property;
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object_class->set_property = gst_oss_device_set_property;
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object_class->finalize = gst_oss_device_finalize;
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g_object_class_install_property (object_class, PROP_DEVICE_PATH,
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g_param_spec_string ("device-path", "OSS device path",
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"The path of the OSS device", "",
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G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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}
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static void
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gst_oss_device_init (GstOssDevice * device)
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{
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}
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static GstDevice *
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gst_oss_device_new (const gchar * device_name,
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GstCaps * caps, const gchar * device_path, GstOssDeviceType type)
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{
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GstOssDevice *gstdev;
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const gchar *element = NULL;
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const gchar *klass = NULL;
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g_return_val_if_fail (device_name, NULL);
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g_return_val_if_fail (device_path, NULL);
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g_return_val_if_fail (caps, NULL);
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switch (type) {
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case GST_OSS_DEVICE_TYPE_SOURCE:
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element = "osssrc";
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klass = "Audio/Source";
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break;
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case GST_OSS_DEVICE_TYPE_SINK:
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element = "osssink";
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klass = "Audio/Sink";
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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gstdev = g_object_new (GST_TYPE_OSS_DEVICE,
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"display-name", device_name, "caps", caps, "device-class", klass,
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"device-path", device_path, NULL);
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gstdev->element = element;
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gst_caps_unref (caps);
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return GST_DEVICE (gstdev);
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}
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