looking-glass/c-host/app.c

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/*
Looking Glass - KVM FrameRelay (KVMFR) Client
Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
https://looking-glass.hostfission.com
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "app.h"
#include <stdio.h>
#include <inttypes.h>
#include <unistd.h>
#include <stdlib.h>
#include "debug.h"
#include "capture/interfaces.h"
#include "KVMFR.h"
#define ALIGN_DN(x) ((uintptr_t)(x) & ~0x7F)
#define ALIGN_UP(x) ALIGN_DN(x + 0x7F)
#define MAX_FRAMES 2
struct app
{
KVMFRHeader * shmHeader;
uint8_t * pointerData;
unsigned int pointerDataSize;
unsigned int pointerOffset;
CaptureInterface * iface;
uint8_t * frames;
unsigned int frameSize;
uint8_t * frame[MAX_FRAMES];
unsigned int frameOffset[MAX_FRAMES];
bool running;
osEventHandle * updateEvent;
osThreadHandle * pointerThread;
osEventHandle * pointerEvent;
osThreadHandle * frameThread;
osEventHandle * frameEvent;
};
static struct app app;
static int pointerThread(void * opaque)
{
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DEBUG_INFO("Cursor thread started");
while(app.running)
{
if (!os_waitEvent(app.pointerEvent) || !app.running)
break;
#if 0
CapturePointer pointer;
pointer->data = app.pointerData;
if (!app.iface->getPointer(&pointer))
DEBUG_ERROR("Failed to get the pointer");
os_signalEvent(app.updateEvent);
#endif
}
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DEBUG_INFO("Cursor thread stopped");
return 0;
}
static int frameThread(void * opaque)
{
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DEBUG_INFO("Frame thread started");
int frameIndex = 0;
while(app.running)
{
if (!os_waitEvent(app.frameEvent) || !app.running)
break;
CaptureFrame frame;
frame.data = app.frame[frameIndex];
if (!app.iface->getFrame(&frame))
DEBUG_ERROR("Failed to get the frame");
os_signalEvent(app.updateEvent);
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if (++frameIndex == MAX_FRAMES)
frameIndex = 0;
}
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DEBUG_INFO("Frame thread stopped");
return 0;
}
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bool startThreads()
{
app.running = true;
if (!os_createThread("CursorThread", pointerThread, NULL, &app.pointerThread))
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{
DEBUG_ERROR("Failed to create the pointer thread");
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return false;
}
if (!os_createThread("FrameThread", frameThread, NULL, &app.frameThread))
{
DEBUG_ERROR("Failed to create the frame thread");
return false;
}
return true;
}
bool stopThreads()
{
bool ok = true;
app.running = false;
os_signalEvent(app.frameEvent );
os_signalEvent(app.pointerEvent);
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if (app.frameThread && !os_joinThread(app.frameThread, NULL))
{
DEBUG_WARN("Failed to join the frame thread");
ok = false;
}
app.frameThread = NULL;
if (app.pointerThread && !os_joinThread(app.pointerThread, NULL))
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{
DEBUG_WARN("Failed to join the pointer thread");
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ok = false;
}
app.pointerThread = NULL;
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return ok;
}
static bool captureStart()
{
DEBUG_INFO("Using : %s", app.iface->getName());
const unsigned int maxFrameSize = app.iface->getMaxFrameSize();
if (maxFrameSize > app.frameSize)
{
DEBUG_ERROR("Maximum frame size of %d bytes excceds maximum space available", maxFrameSize);
return false;
}
DEBUG_INFO("Capture Size : %u MiB (%u)", maxFrameSize / 1048576, maxFrameSize);
DEBUG_INFO("==== [ Capture Start ] ====");
return startThreads();
}
int app_main()
{
unsigned int shmemSize = os_shmemSize();
uint8_t * shmemMap = NULL;
int exitcode = 0;
DEBUG_INFO("IVSHMEM Size : %u MiB", shmemSize / 1048576);
if (!os_shmemMmap((void **)&shmemMap) || !shmemMap)
{
DEBUG_ERROR("Failed to map the shared memory");
return -1;
}
DEBUG_INFO("IVSHMEM Address : 0x%" PRIXPTR, (uintptr_t)shmemMap);
app.shmHeader = (KVMFRHeader *)shmemMap;
app.pointerData = (uint8_t *)ALIGN_UP(shmemMap + sizeof(KVMFRHeader));
app.pointerDataSize = 1048576; // 1MB fixed for pointer size, should be more then enough
app.pointerOffset = app.pointerData - shmemMap;
app.frames = (uint8_t *)ALIGN_UP(app.pointerData + app.pointerDataSize);
app.frameSize = ALIGN_DN((shmemSize - (app.frames - shmemMap)) / MAX_FRAMES);
DEBUG_INFO("Max Cursor Size : %u MiB" , app.pointerDataSize / 1048576);
DEBUG_INFO("Max Frame Size : %u MiB" , app.frameSize / 1048576);
DEBUG_INFO("Cursor : 0x%" PRIXPTR " (0x%08x)", (uintptr_t)app.pointerData, app.pointerOffset);
for (int i = 0; i < MAX_FRAMES; ++i)
{
app.frame [i] = app.frames + i * app.frameSize;
app.frameOffset[i] = app.frame[i] - shmemMap;
DEBUG_INFO("Frame %d : 0x%" PRIXPTR " (0x%08x)", i, (uintptr_t)app.frame[i], app.frameOffset[i]);
}
CaptureInterface * iface = NULL;
for(int i = 0; CaptureInterfaces[i]; ++i)
{
iface = CaptureInterfaces[i];
DEBUG_INFO("Trying : %s", iface->getName());
if (!iface->create())
{
iface = NULL;
continue;
}
if (iface->init())
break;
iface->free();
iface = NULL;
}
if (!iface)
{
DEBUG_ERROR("Failed to find a supported capture interface");
exitcode = -1;
goto fail;
}
app.iface = iface;
app.frameEvent = os_createEvent();
if (!app.frameEvent)
{
DEBUG_ERROR("Failed to create the frame event");
exitcode = -1;
goto exit;
}
app.updateEvent = os_createEvent();
if (!app.updateEvent)
{
DEBUG_ERROR("Failed to create the update event");
exitcode = -1;
goto exit;
}
app.pointerEvent = os_createEvent();
if (!app.pointerEvent)
{
DEBUG_ERROR("Failed to create the pointer event");
exitcode = -1;
goto exit;
}
if (!captureStart())
{
exitcode = -1;
goto exit;
}
// start signalled
os_signalEvent(app.updateEvent);
while(app.running)
{
// wait for one of the threads to flag an update
if (!os_waitEvent(app.updateEvent) || !app.running)
break;
bool frameUpdate = false;
bool pointerUpdate = false;
switch(iface->capture(&frameUpdate, &pointerUpdate))
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{
case CAPTURE_RESULT_OK:
break;
case CAPTURE_RESULT_TIMEOUT:
continue;
case CAPTURE_RESULT_REINIT:
DEBUG_INFO("==== [ Capture Reinit ] ====");
if (!stopThreads())
{
exitcode = -1;
goto finish;
}
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if (!iface->deinit() || !iface->init())
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{
DEBUG_ERROR("Failed to reinitialize the capture device");
exitcode = -1;
goto finish;
}
if (!captureStart())
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{
exitcode = -1;
goto finish;
}
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// start signalled
os_signalEvent(app.updateEvent);
continue;
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case CAPTURE_RESULT_ERROR:
DEBUG_ERROR("Capture interface reported a fatal error");
exitcode = -1;
goto finish;
}
if (frameUpdate && !os_signalEvent(app.frameEvent))
{
DEBUG_ERROR("Failed to signal the frame thread");
exitcode = -1;
goto finish;
}
if (pointerUpdate && !os_signalEvent(app.pointerEvent))
{
DEBUG_ERROR("Failed to signal the pointer thread");
exitcode = -1;
goto finish;
}
}
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finish:
stopThreads();
exit:
if (app.pointerEvent)
os_freeEvent(app.pointerEvent);
if (app.frameEvent)
os_freeEvent(app.frameEvent);
if (app.updateEvent)
os_freeEvent(app.updateEvent);
iface->deinit();
iface->free();
fail:
os_shmemUnmap();
return exitcode;
}
void app_quit()
{
app.running = false;
os_signalEvent(app.updateEvent);
}