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533 lines (447 loc) · 13.2 KB
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#include <fcntl.h>
#include <getopt.h>
#include <linux/fb.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/socket.h>
#include <cmath>
#include <condition_variable>
#include <chrono>
#include <future>
#include <iostream>
#include <mutex>
#include <thread>
#include <Minicap.hpp>
#include "util/debug.h"
#include "JpgEncoder.hpp"
#include "SimpleServer.hpp"
#include "Projection.hpp"
#define BANNER_VERSION 1
#define BANNER_SIZE 24
#define DEFAULT_SOCKET_NAME "minicap"
#define DEFAULT_DISPLAY_ID 0
#define DEFAULT_JPG_QUALITY 80
enum {
QUIRK_DUMB = 1,
QUIRK_ALWAYS_UPRIGHT = 2,
QUIRK_TEAR = 4,
};
static void
usage(const char* pname) {
fprintf(stderr,
"Usage: %s [-h] [-n <name>]\n"
" -d <id>: Display ID. (%d)\n"
" -n <name>: Change the name of the abtract unix domain socket. (%s)\n"
" -P <value>: Display projection (<w>x<h>@<w>x<h>/{0|90|180|270}).\n"
" -s: Take a screenshot and output it to stdout. Needs -P.\n"
" -S: Skip frames when they cannot be consumed quickly enough.\n"
" -t: Attempt to get the capture method running, then exit.\n"
" -i: Get display information in JSON format. May segfault.\n"
" -h: Show help.\n",
pname, DEFAULT_DISPLAY_ID, DEFAULT_SOCKET_NAME
);
}
class FrameWaiter: public Minicap::FrameAvailableListener {
public:
FrameWaiter()
: mPendingFrames(0),
mTimeout(std::chrono::milliseconds(100)),
mStopped(false) {
}
int
waitForFrame() {
std::unique_lock<std::mutex> lock(mMutex);
while (!mStopped) {
if (mCondition.wait_for(lock, mTimeout, [this]{return mPendingFrames > 0;})) {
return mPendingFrames--;
}
}
return 0;
}
void
reportExtraConsumption(int count) {
std::unique_lock<std::mutex> lock(mMutex);
mPendingFrames -= count;
}
void
onFrameAvailable() {
std::unique_lock<std::mutex> lock(mMutex);
mPendingFrames += 1;
mCondition.notify_one();
}
void
stop() {
mStopped = true;
}
bool
isStopped() {
return mStopped;
}
private:
std::mutex mMutex;
std::condition_variable mCondition;
std::chrono::milliseconds mTimeout;
int mPendingFrames;
bool mStopped;
};
static int
pumps(int fd, unsigned char* data, size_t length) {
do {
// Make sure that we don't generate a SIGPIPE even if the socket doesn't
// exist anymore. We'll still get an EPIPE which is perfect.
int wrote = send(fd, data, length, MSG_NOSIGNAL);
if (wrote < 0) {
return wrote;
}
data += wrote;
length -= wrote;
}
while (length > 0);
return 0;
}
static int
pumpf(int fd, unsigned char* data, size_t length) {
do {
int wrote = write(fd, data, length);
if (wrote < 0) {
return wrote;
}
data += wrote;
length -= wrote;
}
while (length > 0);
return 0;
}
static int
putUInt32LE(unsigned char* data, int value) {
data[0] = (value & 0x000000FF) >> 0;
data[1] = (value & 0x0000FF00) >> 8;
data[2] = (value & 0x00FF0000) >> 16;
data[3] = (value & 0xFF000000) >> 24;
}
static int
try_get_framebuffer_display_info(uint32_t displayId, Minicap::DisplayInfo* info) {
char path[64];
sprintf(path, "/dev/graphics/fb%d", displayId);
int fd = open(path, O_RDONLY);
if (fd < 0) {
MCERROR("Cannot open %s", path);
return -1;
}
fb_var_screeninfo vinfo;
if (ioctl(fd, FBIOGET_VSCREENINFO, &vinfo) < 0) {
close(fd);
MCERROR("Cannot get FBIOGET_VSCREENINFO of %s", path);
return -1;
}
info->width = vinfo.xres;
info->height = vinfo.yres;
info->orientation = vinfo.rotate;
info->xdpi = static_cast<float>(vinfo.xres) / static_cast<float>(vinfo.width) * 25.4;
info->ydpi = static_cast<float>(vinfo.yres) / static_cast<float>(vinfo.height) * 25.4;
info->size = std::sqrt(
(static_cast<float>(vinfo.width) * static_cast<float>(vinfo.width)) +
(static_cast<float>(vinfo.height) * static_cast<float>(vinfo.height))) / 25.4;
info->density = std::sqrt(
(static_cast<float>(vinfo.xres) * static_cast<float>(vinfo.xres)) +
(static_cast<float>(vinfo.yres) * static_cast<float>(vinfo.yres))) / info->size;
info->secure = false;
info->fps = 0;
close(fd);
return 0;
}
static FrameWaiter gWaiter;
static void
signal_handler(int signum) {
switch (signum) {
case SIGINT:
MCINFO("Received SIGINT, stopping");
gWaiter.stop();
break;
case SIGTERM:
MCINFO("Received SIGTERM, stopping");
gWaiter.stop();
break;
default:
abort();
break;
}
}
int
main(int argc, char* argv[]) {
const char* pname = argv[0];
const char* sockname = DEFAULT_SOCKET_NAME;
uint32_t displayId = DEFAULT_DISPLAY_ID;
unsigned int quality = DEFAULT_JPG_QUALITY;
bool showInfo = false;
bool takeScreenshot = false;
bool skipFrames = false;
bool testOnly = false;
Projection proj;
int opt;
while ((opt = getopt(argc, argv, "d:n:P:siSth")) != -1) {
switch (opt) {
case 'd':
displayId = atoi(optarg);
break;
case 'n':
sockname = optarg;
break;
case 'P': {
Projection::Parser parser;
if (!parser.parse(proj, optarg, optarg + strlen(optarg))) {
std::cerr << "ERROR: invalid format for -P, need <w>x<h>@<w>x<h>/{0|90|180|270}" << std::endl;
return EXIT_FAILURE;
}
break;
}
case 's':
takeScreenshot = true;
break;
case 'i':
showInfo = true;
break;
case 'S':
skipFrames = true;
break;
case 't':
testOnly = true;
break;
case 'h':
usage(pname);
return EXIT_SUCCESS;
case '?':
default:
usage(pname);
return EXIT_FAILURE;
}
}
// Set up signal handler.
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = signal_handler;
sigemptyset(&sa.sa_mask);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
// Start Android's thread pool so that it will be able to serve our requests.
minicap_start_thread_pool();
if (showInfo) {
Minicap::DisplayInfo info;
if (minicap_try_get_display_info(displayId, &info) != 0) {
if (try_get_framebuffer_display_info(displayId, &info) != 0) {
MCERROR("Unable to get display info");
return EXIT_FAILURE;
}
}
int rotation;
switch (info.orientation) {
case Minicap::ORIENTATION_0:
rotation = 0;
break;
case Minicap::ORIENTATION_90:
rotation = 90;
break;
case Minicap::ORIENTATION_180:
rotation = 180;
break;
case Minicap::ORIENTATION_270:
rotation = 270;
break;
}
std::cout.precision(2);
std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield);
std::cout << "{" << std::endl
<< " \"id\": " << displayId << "," << std::endl
<< " \"width\": " << info.width << "," << std::endl
<< " \"height\": " << info.height << "," << std::endl
<< " \"xdpi\": " << info.xdpi << "," << std::endl
<< " \"ydpi\": " << info.ydpi << "," << std::endl
<< " \"size\": " << info.size << "," << std::endl
<< " \"density\": " << info.density << "," << std::endl
<< " \"fps\": " << info.fps << "," << std::endl
<< " \"secure\": " << (info.secure ? "true" : "false") << "," << std::endl
<< " \"rotation\": " << rotation << std::endl
<< "}" << std::endl;
return EXIT_SUCCESS;
}
proj.forceMaximumSize();
proj.forceAspectRatio();
if (!proj.valid()) {
std::cerr << "ERROR: missing or invalid -P" << std::endl;
return EXIT_FAILURE;
}
std::cerr << "PID: " << getpid() << std::endl;
std::cerr << "INFO: Using projection " << proj << std::endl;
// Disable STDOUT buffering.
setbuf(stdout, NULL);
// Set real display size.
Minicap::DisplayInfo realInfo;
realInfo.width = proj.realWidth;
realInfo.height = proj.realHeight;
// Figure out desired display size.
Minicap::DisplayInfo desiredInfo;
desiredInfo.width = proj.virtualWidth;
desiredInfo.height = proj.virtualHeight;
desiredInfo.orientation = proj.rotation;
// Leave a 4-byte padding to the encoder so that we can inject the size
// to the same buffer.
JpgEncoder encoder(4, 0);
Minicap::Frame frame;
bool haveFrame = false;
// Server config.
SimpleServer server;
// Set up minicap.
Minicap* minicap = minicap_create(displayId);
if (minicap == NULL) {
return EXIT_FAILURE;
}
// Figure out the quirks the current capture method has.
unsigned char quirks = 0;
switch (minicap->getCaptureMethod()) {
case Minicap::METHOD_FRAMEBUFFER:
quirks |= QUIRK_DUMB | QUIRK_TEAR;
break;
case Minicap::METHOD_SCREENSHOT:
quirks |= QUIRK_DUMB;
break;
case Minicap::METHOD_VIRTUAL_DISPLAY:
quirks |= QUIRK_ALWAYS_UPRIGHT;
break;
}
if (minicap->setRealInfo(realInfo) != 0) {
MCERROR("Minicap did not accept real display info");
goto disaster;
}
if (minicap->setDesiredInfo(desiredInfo) != 0) {
MCERROR("Minicap did not accept desired display info");
goto disaster;
}
minicap->setFrameAvailableListener(&gWaiter);
if (minicap->applyConfigChanges() != 0) {
MCERROR("Unable to start minicap with current config");
goto disaster;
}
if (!encoder.reserveData(realInfo.width, realInfo.height)) {
MCERROR("Unable to reserve data for JPG encoder");
goto disaster;
}
if (takeScreenshot) {
if (!gWaiter.waitForFrame()) {
MCERROR("Unable to wait for frame");
goto disaster;
}
int err;
if ((err = minicap->consumePendingFrame(&frame)) != 0) {
MCERROR("Unable to consume pending frame");
goto disaster;
}
if (!encoder.encode(&frame, quality)) {
MCERROR("Unable to encode frame");
goto disaster;
}
if (pumpf(STDOUT_FILENO, encoder.getEncodedData(), encoder.getEncodedSize()) < 0) {
MCERROR("Unable to output encoded frame data");
goto disaster;
}
return EXIT_SUCCESS;
}
if (testOnly) {
if (gWaiter.waitForFrame() <= 0) {
MCERROR("Did not receive any frames");
std::cout << "FAIL" << std::endl;
return EXIT_FAILURE;
}
minicap_free(minicap);
std::cout << "OK" << std::endl;
return EXIT_SUCCESS;
}
if (!server.start(sockname)) {
MCERROR("Unable to start server on namespace '%s'", sockname);
goto disaster;
}
// Prepare banner for clients.
unsigned char banner[BANNER_SIZE];
banner[0] = (unsigned char) BANNER_VERSION;
banner[1] = (unsigned char) BANNER_SIZE;
putUInt32LE(banner + 2, getpid());
putUInt32LE(banner + 6, realInfo.width);
putUInt32LE(banner + 10, realInfo.height);
putUInt32LE(banner + 14, desiredInfo.width);
putUInt32LE(banner + 18, desiredInfo.height);
banner[22] = (unsigned char) desiredInfo.orientation;
banner[23] = quirks;
int fd;
while (!gWaiter.isStopped() && (fd = server.accept()) > 0) {
MCINFO("New client connection");
if (pumps(fd, banner, BANNER_SIZE) < 0) {
close(fd);
continue;
}
int pending, err;
while (!gWaiter.isStopped() && (pending = gWaiter.waitForFrame()) > 0) {
if (skipFrames && pending > 1) {
// Skip frames if we have too many. Not particularly thread safe,
// but this loop should be the only consumer anyway (i.e. nothing
// else decreases the frame count).
gWaiter.reportExtraConsumption(pending - 1);
while (--pending >= 1) {
if ((err = minicap->consumePendingFrame(&frame)) != 0) {
if (err == -EINTR) {
MCINFO("Frame consumption interrupted by EINTR");
goto close;
}
else {
MCERROR("Unable to skip pending frame");
goto disaster;
}
}
minicap->releaseConsumedFrame(&frame);
}
}
if ((err = minicap->consumePendingFrame(&frame)) != 0) {
if (err == -EINTR) {
MCINFO("Frame consumption interrupted by EINTR");
goto close;
}
else {
MCERROR("Unable to consume pending frame");
goto disaster;
}
}
haveFrame = true;
// Encode the frame.
if (!encoder.encode(&frame, quality)) {
MCERROR("Unable to encode frame");
goto disaster;
}
// Push it out synchronously because it's fast and we don't care
// about other clients.
unsigned char* data = encoder.getEncodedData() - 4;
size_t size = encoder.getEncodedSize();
putUInt32LE(data, size);
if (pumps(fd, data, size + 4) < 0) {
break;
}
// This will call onFrameAvailable() on older devices, so we have
// to do it here or the loop will stop.
minicap->releaseConsumedFrame(&frame);
haveFrame = false;
}
close:
MCINFO("Closing client connection");
close(fd);
// Have we consumed one frame but are still holding it?
if (haveFrame) {
minicap->releaseConsumedFrame(&frame);
}
}
minicap_free(minicap);
return EXIT_SUCCESS;
disaster:
if (haveFrame) {
minicap->releaseConsumedFrame(&frame);
}
minicap_free(minicap);
return EXIT_FAILURE;
}