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public class Dino.Plugins.Rtp.Device : MediaDevice, Object {
public Plugin plugin { get; private set; }
public Gst.Device device { get; private set; }
private string device_name;
public string id { get {
return device_name;
}}
private string device_display_name;
public string display_name { get {
return device_display_name;
}}
public string detail_name { get {
return device.properties.get_string("alsa.card_name") ?? device.properties.get_string("alsa.id") ?? id;
}}
public Gst.Pipeline pipe { get {
return plugin.pipe;
}}
public string? media { get {
if (device.device_class.has_prefix("Audio/")) {
return "audio";
} else if (device.device_class.has_prefix("Video/")) {
return "video";
} else {
return null;
}
}}
public bool is_source { get {
return device.device_class.has_suffix("/Source");
}}
public bool is_sink { get {
return device.device_class.has_suffix("/Sink");
}}
private Gst.Element element;
private Gst.Element tee;
private Gst.Element dsp;
private Gst.Element mixer;
private Gst.Element filter;
private int links = 0;
public Device(Plugin plugin, Gst.Device device) {
this.plugin = plugin;
update(device);
}
public bool matches(Gst.Device device) {
if (this.device.name == device.name) return true;
return false;
}
public void update(Gst.Device device) {
this.device = device;
this.device_name = device.name;
this.device_display_name = device.display_name;
}
public Gst.Element? link_sink() {
if (element == null) create();
links++;
if (mixer != null) return mixer;
if (is_sink && media == "audio") return filter;
return element;
}
public Gst.Element? link_source() {
if (element == null) create();
links++;
if (tee != null) return tee;
return element;
}
public void unlink() {
if (links <= 0) {
critical("Link count below zero.");
return;
}
links--;
if (links == 0) {
destroy();
}
}
private Gst.Caps get_best_caps() {
if (media == "audio") {
return Gst.Caps.from_string("audio/x-raw,rate=48000,channels=1");
} else if (media == "video" && device.caps.get_size() > 0) {
int best_index = 0;
int best_fps = 0;
int best_width = 0;
int best_height = 0;
for (int i = 0; i < device.caps.get_size(); i++) {
unowned Gst.Structure? that = device.caps.get_structure(i);
if (!that.has_name("video/x-raw")) continue;
int num = 0, den = 0, width = 0, height = 0;
if (!that.has_field("framerate") || !that.get_fraction("framerate", out num, out den)) continue;
if (!that.has_field("width") || !that.get_int("width", out width)) continue;
if (!that.has_field("height") || !that.get_int("height", out height)) continue;
int fps = num/den;
if (best_fps < fps || best_fps == fps && best_width < width || best_fps == fps && best_width == width && best_height < height) {
best_fps = fps;
best_width = width;
best_height = height;
best_index = i;
}
}
return caps_copy_nth(device.caps, best_index);
} else if (device.caps.get_size() > 0) {
return caps_copy_nth(device.caps, 0);
} else {
return new Gst.Caps.any();
}
}
// Backport from gst_caps_copy_nth added in GStreamer 1.16
private static Gst.Caps caps_copy_nth(Gst.Caps source, uint index) {
Gst.Caps target = new Gst.Caps.empty();
target.flags = source.flags;
target.append_structure_full(source.get_structure(index).copy(), source.get_features(index).copy());
return target;
}
private void create() {
debug("Creating device %s", id);
plugin.pause();
element = device.create_element(id);
pipe.add(element);
if (is_source) {
filter = Gst.ElementFactory.make("capsfilter", @"$id-caps-filter");
filter.@set("caps", get_best_caps());
pipe.add(filter);
element.link(filter);
if (media == "audio" && plugin.echoprobe != null) {
dsp = Gst.ElementFactory.make("webrtcdsp", @"$id-dsp");
if (dsp != null) {
dsp.@set("probe", plugin.echoprobe.name);
pipe.add(dsp);
filter.link(dsp);
}
}
tee = Gst.ElementFactory.make("tee", @"$id-tee");
tee.@set("allow-not-linked", true);
pipe.add(tee);
(dsp ?? filter).link(tee);
}
if (is_sink) {
element.@set("async", false);
element.@set("sync", false);
}
if (is_sink && media == "audio") {
filter = Gst.ElementFactory.make("capsfilter", @"$id-caps-filter");
filter.@set("caps", get_best_caps());
pipe.add(filter);
if (plugin.echoprobe != null) {
filter.link(plugin.echoprobe);
plugin.echoprobe.link(element);
} else {
filter.link(element);
}
}
plugin.unpause();
}
private void destroy() {
if (mixer != null) {
if (is_sink && media == "audio" && plugin.echoprobe != null) {
plugin.echoprobe.unlink(mixer);
}
int linked_sink_pads = 0;
mixer.foreach_sink_pad((_, pad) => {
if (pad.is_linked()) linked_sink_pads++;
return true;
});
if (linked_sink_pads > 0) {
warning("%s-mixer still has %i sink pads while being destroyed", id, linked_sink_pads);
}
mixer.set_locked_state(true);
mixer.set_state(Gst.State.NULL);
mixer.unlink(element);
pipe.remove(mixer);
mixer = null;
} else if (is_sink && media == "audio") {
if (filter != null) {
filter.set_locked_state(true);
filter.set_state(Gst.State.NULL);
if (plugin.echoprobe != null) {
filter.unlink(plugin.echoprobe);
} else {
filter.unlink(element);
}
pipe.remove(filter);
filter = null;
}
if (plugin.echoprobe != null) {
plugin.echoprobe.unlink(element);
}
}
element.set_locked_state(true);
element.set_state(Gst.State.NULL);
if (filter != null) element.unlink(filter);
else if (is_source) element.unlink(tee);
pipe.remove(element);
element = null;
if (filter != null) {
filter.set_locked_state(true);
filter.set_state(Gst.State.NULL);
filter.unlink(dsp ?? tee);
pipe.remove(filter);
filter = null;
}
if (dsp != null) {
dsp.set_locked_state(true);
dsp.set_state(Gst.State.NULL);
dsp.unlink(tee);
pipe.remove(dsp);
dsp = null;
}
if (tee != null) {
int linked_src_pads = 0;
tee.foreach_src_pad((_, pad) => {
if (pad.is_linked()) linked_src_pads++;
return true;
});
if (linked_src_pads != 0) {
warning("%s-tee still has %d src pads while being destroyed", id, linked_src_pads);
}
tee.set_locked_state(true);
tee.set_state(Gst.State.NULL);
pipe.remove(tee);
tee = null;
}
debug("Destroyed device %s", id);
}
}
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