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Merge pull request #121 from glyptodon/improve-lag-compensation

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GUAC-1389: Stretch RDP and VNC frames until client has caught up.
This commit is contained in:
James Muehlner 2016-03-08 19:37:44 -08:00
commit b8c5ccb321
4 changed files with 84 additions and 63 deletions
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2
src/protocols/rdp/client.h
View File

@ -37,7 +37,7 @@
* milliseconds. If the server is silent for at least this amount of time, the
* frame will be considered finished.
*/
#define GUAC_RDP_FRAME_TIMEOUT 10
#define GUAC_RDP_FRAME_TIMEOUT 0
/**
* The amount of time to wait for a new message from the RDP server when

28
src/protocols/rdp/rdp.c
View File

@ -829,9 +829,10 @@ void* guac_rdp_client_thread(void* data) {
/* Connection complete */
rdp_client->rdp_inst = rdp_inst;
rdpChannels* channels = rdp_inst->context->channels;
guac_timestamp last_frame_end = guac_timestamp_current();
/* Handle messages from RDP server while client is running */
while (client->state == GUAC_CLIENT_RUNNING) {
@ -845,8 +846,13 @@ void* guac_rdp_client_thread(void* data) {
/* Wait for data and construct a reasonable frame */
int wait_result = rdp_guac_client_wait_for_messages(client,
GUAC_RDP_FRAME_START_TIMEOUT);
if (wait_result > 0) {
int processing_lag = guac_client_get_processing_lag(client);
guac_timestamp frame_start = guac_timestamp_current();
while (wait_result > 0) {
/* Read server messages until frame is built */
do {
guac_timestamp frame_end;
int frame_remaining;
@ -902,15 +908,26 @@ void* guac_rdp_client_thread(void* data) {
/* Calculate time remaining in frame */
frame_end = guac_timestamp_current();
frame_remaining = frame_start + GUAC_RDP_FRAME_DURATION - frame_end;
frame_remaining = frame_start + GUAC_RDP_FRAME_DURATION
- frame_end;
/* Calculate time that client needs to catch up */
int time_elapsed = frame_end - last_frame_end;
int required_wait = processing_lag - time_elapsed;
/* Increase the duration of this frame if client is lagging */
if (required_wait > GUAC_RDP_FRAME_TIMEOUT)
wait_result = rdp_guac_client_wait_for_messages(client,
required_wait*1000);
/* Wait again if frame remaining */
if (frame_remaining > 0)
else if (frame_remaining > 0)
wait_result = rdp_guac_client_wait_for_messages(client,
GUAC_RDP_FRAME_TIMEOUT*1000);
else
break;
} while (wait_result > 0);
}
/* If an error occurred, fail */
@ -923,6 +940,9 @@ void* guac_rdp_client_thread(void* data) {
guac_client_end_frame(client);
guac_socket_flush(client->socket);
/* Record end of frame */
last_frame_end = guac_timestamp_current();
}
guac_client_log(client, GUAC_LOG_INFO, "Internal RDP client disconnected");

2
src/protocols/vnc/client.h
View File

@ -36,7 +36,7 @@
* milliseconds. If the server is silent for at least this amount of time, the
* frame will be considered finished.
*/
#define GUAC_VNC_FRAME_TIMEOUT 10
#define GUAC_VNC_FRAME_TIMEOUT 0
/**
* The amount of time to wait for a new message from the VNC server when

23
src/protocols/vnc/vnc.c
View File

@ -345,6 +345,7 @@ void* guac_vnc_client_thread(void* data) {
GUAC_VNC_FRAME_START_TIMEOUT);
if (wait_result > 0) {
int processing_lag = guac_client_get_processing_lag(client);
guac_timestamp frame_start = guac_timestamp_current();
/* Read server messages until frame is built */
@ -366,8 +367,17 @@ void* guac_vnc_client_thread(void* data) {
frame_remaining = frame_start + GUAC_VNC_FRAME_DURATION
- frame_end;
/* Calculate time that client needs to catch up */
int time_elapsed = frame_end - last_frame_end;
int required_wait = processing_lag - time_elapsed;
/* Increase the duration of this frame if client is lagging */
if (required_wait > GUAC_VNC_FRAME_TIMEOUT)
wait_result = guac_vnc_wait_for_messages(rfb_client,
required_wait*1000);
/* Wait again if frame remaining */
if (frame_remaining > 0)
else if (frame_remaining > 0)
wait_result = guac_vnc_wait_for_messages(rfb_client,
GUAC_VNC_FRAME_TIMEOUT*1000);
else
@ -386,17 +396,8 @@ void* guac_vnc_client_thread(void* data) {
guac_client_end_frame(client);
guac_socket_flush(client->socket);
/* Calculate time since previous frame ended */
int current_frame_end = guac_timestamp_current();
int time_elapsed = current_frame_end - last_frame_end;
int processing_lag = guac_client_get_processing_lag(client);
/* Insert delays as necessary to allow client to catch up */
if (time_elapsed < processing_lag)
guac_timestamp_msleep(processing_lag - time_elapsed);
/* Record end of frame */
last_frame_end = current_frame_end;
last_frame_end = guac_timestamp_current();
}