virtualx-engine/modules/webrtc/webrtc_peer_js.cpp
2019-04-12 18:51:24 +02:00

455 lines
12 KiB
C++

/*************************************************************************/
/* webrtc_peer_js.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifdef JAVASCRIPT_ENABLED
#include "webrtc_peer_js.h"
#include "emscripten.h"
extern "C" {
EMSCRIPTEN_KEEPALIVE void _emrtc_on_ice_candidate(void *obj, char *p_MidName, int p_MlineIndexName, char *p_sdpName) {
WebRTCPeerJS *peer = static_cast<WebRTCPeerJS *>(obj);
peer->emit_signal("new_ice_candidate", String(p_MidName), p_MlineIndexName, String(p_sdpName));
}
EMSCRIPTEN_KEEPALIVE void _emrtc_offer_created(void *obj, char *p_type, char *p_offer) {
WebRTCPeerJS *peer = static_cast<WebRTCPeerJS *>(obj);
peer->emit_signal("offer_created", String(p_type), String(p_offer));
}
EMSCRIPTEN_KEEPALIVE void _emrtc_on_error(void *obj) {
WebRTCPeerJS *peer = static_cast<WebRTCPeerJS *>(obj);
peer->_on_error();
}
EMSCRIPTEN_KEEPALIVE void _emrtc_on_open(void *obj) {
WebRTCPeerJS *peer = static_cast<WebRTCPeerJS *>(obj);
peer->_on_open();
}
EMSCRIPTEN_KEEPALIVE void _emrtc_on_close(void *obj) {
WebRTCPeerJS *peer = static_cast<WebRTCPeerJS *>(obj);
peer->_on_close();
}
EMSCRIPTEN_KEEPALIVE void _emrtc_on_message(void *obj, uint8_t *p_data, uint32_t p_size, bool p_is_string) {
WebRTCPeerJS *peer = static_cast<WebRTCPeerJS *>(obj);
peer->_on_message(p_data, p_size, p_is_string);
}
EMSCRIPTEN_KEEPALIVE void _emrtc_bind_channel(int p_id) {
/* clang-format off */
EM_ASM({
if (!Module.IDHandler.has($0)) {
return; // Godot Object is gone!
}
var dict = Module.IDHandler.get($0);
var channel = dict["channel"];
var c_ptr = dict["ptr"];
channel.onopen = function (evt) {
ccall("_emrtc_on_open",
"void",
["number"],
[c_ptr]
);
};
channel.onclose = function (evt) {
ccall("_emrtc_on_close",
"void",
["number"],
[c_ptr]
);
};
channel.onerror = function (evt) {
ccall("_emrtc_on_error",
"void",
["number"],
[c_ptr]
);
};
channel.binaryType = "arraybuffer";
channel.onmessage = function(event) {
var buffer;
var is_string = 0;
if (event.data instanceof ArrayBuffer) {
buffer = new Uint8Array(event.data);
} else if (event.data instanceof Blob) {
alert("Blob type not supported");
return;
} else if (typeof event.data === "string") {
is_string = 1;
var enc = new TextEncoder("utf-8");
buffer = new Uint8Array(enc.encode(event.data));
} else {
alert("Unknown message type");
return;
}
var len = buffer.length*buffer.BYTES_PER_ELEMENT;
var out = Module._malloc(len);
Module.HEAPU8.set(buffer, out);
ccall("_emrtc_on_message",
"void",
["number", "number", "number", "number"],
[c_ptr, out, len, is_string]
);
Module._free(out);
}
}, p_id);
/* clang-format on */
}
}
void _emrtc_create_pc(int p_id) {
/* clang-format off */
EM_ASM({
var dict = Module.IDHandler.get($0);
var c_ptr = dict["ptr"];
// Setup local connaction
var conn = new RTCPeerConnection();
conn.onicecandidate = function(event) {
if (!Module.IDHandler.get($0)) return;
if (!event.candidate) return;
var c = event.candidate;
// should emit on ice candidate
ccall("_emrtc_on_ice_candidate",
"void",
["number", "string", "number", "string"],
[c_ptr, c.sdpMid, c.sdpMLineIndex, c.candidate]
);
};
conn.ondatachannel = function (evt) {
var dict = Module.IDHandler.get($0);
if (!dict || dict["channel"]) {
return;
}
var channel = evt.channel;
dict["channel"] = channel;
ccall("_emrtc_bind_channel",
"void",
["number"],
[$0]
);
};
dict["conn"] = conn;
}, p_id);
/* clang-format on */
}
void WebRTCPeerJS::_on_open() {
in_buffer.resize(16);
_conn_state = STATE_CONNECTED;
}
void WebRTCPeerJS::_on_close() {
close();
}
void WebRTCPeerJS::_on_error() {
close();
_conn_state = STATE_FAILED;
}
void WebRTCPeerJS::_on_message(uint8_t *p_data, uint32_t p_size, bool p_is_string) {
if (in_buffer.space_left() < p_size + 5) {
ERR_EXPLAIN("Buffer full! Dropping data");
ERR_FAIL();
}
uint8_t is_string = p_is_string ? 1 : 0;
in_buffer.write((uint8_t *)&p_size, 4);
in_buffer.write((uint8_t *)&is_string, 1);
in_buffer.write(p_data, p_size);
queue_count++;
}
void WebRTCPeerJS::close() {
in_buffer.resize(0);
queue_count = 0;
_was_string = false;
/* clang-format off */
EM_ASM({
var dict = Module.IDHandler.get($0);
if (!dict) return;
if (dict["channel"]) {
dict["channel"].close();
dict["channel"] = null;
}
if (dict["conn"]) {
dict["conn"].close();
}
}, _js_id);
/* clang-format on */
_conn_state = STATE_CLOSED;
}
Error WebRTCPeerJS::create_offer() {
ERR_FAIL_COND_V(_conn_state != STATE_NEW, FAILED);
_conn_state = STATE_CONNECTING;
/* clang-format off */
EM_ASM({
var dict = Module.IDHandler.get($0);
var conn = dict["conn"];
var c_ptr = dict["ptr"];
var onError = function(error) {
console.log(error);
ccall("_emrtc_on_error",
"void",
["number"],
[c_ptr]
);
};
var onCreated = function(offer) {
ccall("_emrtc_offer_created",
"void",
["number", "string", "string"],
[c_ptr, offer.type, offer.sdp]
);
};
var channel = conn.createDataChannel("default");
dict["channel"] = channel;
ccall("_emrtc_bind_channel",
"void",
["number"],
[$0]
);
conn.createOffer().then(onCreated).catch(onError);
}, _js_id);
/* clang-format on */
return OK;
}
Error WebRTCPeerJS::set_local_description(String type, String sdp) {
/* clang-format off */
EM_ASM({
var dict = Module.IDHandler.get($0);
var conn = dict["conn"];
var c_ptr = dict["ptr"];
var type = UTF8ToString($1);
var sdp = UTF8ToString($2);
var onError = function(error) {
console.log(error);
ccall("_emrtc_on_error",
"void",
["number"],
[c_ptr]
);
};
conn.setLocalDescription({
"sdp": sdp,
"type": type
}).catch(onError);
}, _js_id, type.utf8().get_data(), sdp.utf8().get_data());
/* clang-format on */
return OK;
}
Error WebRTCPeerJS::set_remote_description(String type, String sdp) {
if (type == "offer") {
ERR_FAIL_COND_V(_conn_state != STATE_NEW, FAILED);
_conn_state = STATE_CONNECTING;
}
/* clang-format off */
EM_ASM({
var dict = Module.IDHandler.get($0);
var conn = dict["conn"];
var c_ptr = dict["ptr"];
var type = UTF8ToString($1);
var sdp = UTF8ToString($2);
var onError = function(error) {
console.log(error);
ccall("_emrtc_on_error",
"void",
["number"],
[c_ptr]
);
};
var onCreated = function(offer) {
ccall("_emrtc_offer_created",
"void",
["number", "string", "string"],
[c_ptr, offer.type, offer.sdp]
);
};
var onSet = function() {
if (type != "offer") {
return;
}
conn.createAnswer().then(onCreated);
};
conn.setRemoteDescription({
"sdp": sdp,
"type": type
}).then(onSet).catch(onError);
}, _js_id, type.utf8().get_data(), sdp.utf8().get_data());
/* clang-format on */
return OK;
}
Error WebRTCPeerJS::add_ice_candidate(String sdpMidName, int sdpMlineIndexName, String sdpName) {
/* clang-format off */
EM_ASM({
var dict = Module.IDHandler.get($0);
var conn = dict["conn"];
var c_ptr = dict["ptr"];
var sdpMidName = UTF8ToString($1);
var sdpMlineIndexName = UTF8ToString($2);
var sdpName = UTF8ToString($3);
conn.addIceCandidate(new RTCIceCandidate({
"candidate": sdpName,
"sdpMid": sdpMidName,
"sdpMlineIndex": sdpMlineIndexName
}));
}, _js_id, sdpMidName.utf8().get_data(), sdpMlineIndexName, sdpName.utf8().get_data());
/* clang-format on */
return OK;
}
Error WebRTCPeerJS::poll() {
return OK;
}
WebRTCPeer::ConnectionState WebRTCPeerJS::get_connection_state() const {
return _conn_state;
}
int WebRTCPeerJS::get_available_packet_count() const {
return queue_count;
}
Error WebRTCPeerJS::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
ERR_FAIL_COND_V(_conn_state != STATE_CONNECTED, ERR_UNCONFIGURED);
if (queue_count == 0)
return ERR_UNAVAILABLE;
uint32_t to_read = 0;
uint32_t left = 0;
uint8_t is_string = 0;
r_buffer_size = 0;
in_buffer.read((uint8_t *)&to_read, 4);
--queue_count;
left = in_buffer.data_left();
if (left < to_read + 1) {
in_buffer.advance_read(left);
return FAILED;
}
in_buffer.read(&is_string, 1);
_was_string = is_string == 1;
in_buffer.read(packet_buffer, to_read);
*r_buffer = packet_buffer;
r_buffer_size = to_read;
return OK;
}
Error WebRTCPeerJS::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V(_conn_state != STATE_CONNECTED, ERR_UNCONFIGURED);
int is_bin = _write_mode == WebRTCPeer::WRITE_MODE_BINARY ? 1 : 0;
/* clang-format off */
EM_ASM({
var dict = Module.IDHandler.get($0);
var channel = dict["channel"];
var bytes_array = new Uint8Array($2);
var i = 0;
for(i=0; i<$2; i++) {
bytes_array[i] = getValue($1+i, 'i8');
}
if ($3) {
channel.send(bytes_array.buffer);
} else {
var string = new TextDecoder("utf-8").decode(bytes_array);
channel.send(string);
}
}, _js_id, p_buffer, p_buffer_size, is_bin);
/* clang-format on */
return OK;
}
int WebRTCPeerJS::get_max_packet_size() const {
return 1200;
}
void WebRTCPeerJS::set_write_mode(WriteMode p_mode) {
_write_mode = p_mode;
}
WebRTCPeer::WriteMode WebRTCPeerJS::get_write_mode() const {
return _write_mode;
}
bool WebRTCPeerJS::was_string_packet() const {
return _was_string;
}
WebRTCPeerJS::WebRTCPeerJS() {
queue_count = 0;
_was_string = false;
_write_mode = WRITE_MODE_BINARY;
_conn_state = STATE_NEW;
/* clang-format off */
_js_id = EM_ASM_INT({
return Module.IDHandler.add({"conn": null, "ptr": $0, "channel": null});
}, this);
/* clang-format on */
_emrtc_create_pc(_js_id);
}
WebRTCPeerJS::~WebRTCPeerJS() {
close();
/* clang-format off */
EM_ASM({
Module.IDHandler.remove($0);
}, _js_id);
/* clang-format on */
};
#endif