guacamole-spice-protocol/src/protocols/rdp/guac_rdpsnd/rdpsnd_service.c

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/*
* Copyright (C) 2013 Glyptodon LLC
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*
* 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.
*/
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#include "config.h"
#include "rdpsnd_service.h"
#include "rdpsnd_messages.h"
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#include <stdlib.h>
#include <string.h>
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#include <freerdp/constants.h>
#include <freerdp/utils/svc_plugin.h>
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#include <guacamole/audio.h>
#include <guacamole/client.h>
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#ifdef ENABLE_WINPR
#include <winpr/stream.h>
#else
#include "compat/winpr-stream.h"
#endif
/**
* Entry point for RDPSND virtual channel.
*/
int VirtualChannelEntry(PCHANNEL_ENTRY_POINTS pEntryPoints) {
/* Allocate plugin */
guac_rdpsndPlugin* rdpsnd =
(guac_rdpsndPlugin*) calloc(1, sizeof(guac_rdpsndPlugin));
/* Init channel def */
strcpy(rdpsnd->plugin.channel_def.name, "rdpsnd");
rdpsnd->plugin.channel_def.options =
CHANNEL_OPTION_INITIALIZED | CHANNEL_OPTION_ENCRYPT_RDP;
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/* Set callbacks */
rdpsnd->plugin.connect_callback = guac_rdpsnd_process_connect;
rdpsnd->plugin.receive_callback = guac_rdpsnd_process_receive;
rdpsnd->plugin.event_callback = guac_rdpsnd_process_event;
rdpsnd->plugin.terminate_callback = guac_rdpsnd_process_terminate;
/* Finish init */
svc_plugin_init((rdpSvcPlugin*) rdpsnd, pEntryPoints);
return 1;
}
/*
* Service Handlers
*/
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void guac_rdpsnd_process_connect(rdpSvcPlugin* plugin) {
guac_rdpsndPlugin* rdpsnd = (guac_rdpsndPlugin*) plugin;
/* Get audio stream from plugin parameters */
guac_audio_stream* audio = rdpsnd->audio =
(guac_audio_stream*) plugin->channel_entry_points.pExtendedData;
/* NULL out pExtendedData so we don't lose our guac_audio_stream due to an
* automatic free() within libfreerdp */
plugin->channel_entry_points.pExtendedData = NULL;
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#ifdef RDPSVCPLUGIN_INTERVAL_MS
/* Update every 10 ms */
plugin->interval_ms = 10;
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#endif
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/* Log that sound has been loaded */
guac_client_log_info(audio->client, "guacsnd connected.");
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}
void guac_rdpsnd_process_terminate(rdpSvcPlugin* plugin) {
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free(plugin);
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}
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void guac_rdpsnd_process_event(rdpSvcPlugin* plugin, wMessage* event) {
freerdp_event_free(event);
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}
void guac_rdpsnd_process_receive(rdpSvcPlugin* plugin,
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wStream* input_stream) {
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guac_rdpsndPlugin* rdpsnd = (guac_rdpsndPlugin*) plugin;
guac_rdpsnd_pdu_header header;
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/* Get audio stream from plugin */
guac_audio_stream* audio = rdpsnd->audio;
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/* Read RDPSND PDU header */
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Stream_Read_UINT8(input_stream, header.message_type);
Stream_Seek_UINT8(input_stream);
Stream_Read_UINT16(input_stream, header.body_size);
/*
* If next PDU is SNDWAVE (due to receiving WaveInfo PDU previously),
* ignore the header and parse as a Wave PDU.
*/
if (rdpsnd->next_pdu_is_wave) {
guac_rdpsnd_wave_handler(rdpsnd, audio, input_stream, &header);
return;
}
/* Dispatch message to standard handlers */
switch (header.message_type) {
/* Server Audio Formats and Version PDU */
case SNDC_FORMATS:
guac_rdpsnd_formats_handler(rdpsnd, audio,
input_stream, &header);
break;
/* Training PDU */
case SNDC_TRAINING:
guac_rdpsnd_training_handler(rdpsnd, audio,
input_stream, &header);
break;
/* WaveInfo PDU */
case SNDC_WAVE:
guac_rdpsnd_wave_info_handler(rdpsnd, audio,
input_stream, &header);
break;
/* Close PDU */
case SNDC_CLOSE:
guac_rdpsnd_close_handler(rdpsnd, audio,
input_stream, &header);
break;
}
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}