static PassRefPtr<Evas_Object> readImageFromStdin(Evas* evas, long imageSize)
{
OwnArrayPtr<unsigned char> imageBuffer = adoptArrayPtr(new unsigned char[imageSize]);
if (!imageBuffer)
abortWithErrorMessage("cannot allocate image");
const size_t bytesRead = fread(imageBuffer.get(), 1, imageSize, stdin);
if (!bytesRead)
return PassRefPtr<Evas_Object>();
Evas_Object* image = evas_object_image_filled_add(evas);
evas_object_image_colorspace_set(image, EVAS_COLORSPACE_ARGB8888);
evas_object_image_memfile_set(image, imageBuffer.get(), bytesRead, 0, 0);
resizeEcoreEvasIfNeeded(image);
return adoptRef(image);
}
void CalaosCameraView::requestCompleted()
{
if (single_frame)
{
evas_object_image_memfile_set(camImage, &buffer[0], buffer.size(), NULL, NULL);
Evas_Load_Error err = evas_object_image_load_error_get(camImage);
if (err != EVAS_LOAD_ERROR_NONE)
cErrorDom("camera") << "could not load image. error string is \"%s\"" << evas_load_error_str(err);
}
if (format_error)
return;
EcoreTimer::singleShot(0, [=]()
{
if (!single_frame)
cWarningDom("camera") << "Restarting request to camera...";
play();
});
}
void CalaosCameraView::processData()
{
if (!formatDetected)
{
//first frame, we need to look for the boundary
//and for content-type/content-length if present
if (buffer.size() < 4)
return; //need more data
if (buffer[0] != '-' || buffer[1] != '-')
{
//try to detect of the data is directly the jpeg picture
if (buffer[0] == 0xFF && buffer[1] == 0xD8)
{
cWarningDom("camera") << "Data seems to be a single frame.";
single_frame = true;
}
else
{
cWarningDom("camera") << "Wrong start of frame, give up!";
format_error = true;
}
formatDetected = true;
return;
}
//search for the line end after the boundary to get the boundary text
int end, next;
if (!readEnd(2, end, next))
{
if (buffer.size() > 500)
{
cWarningDom("camera") << "Boundary not found, give up!";
format_error = true;
}
return; //need more data;
}
//get boundary
boundary = string((char *)&buffer[0], end);
cDebugDom("camera") << "Found boundary \"" << boundary << "\"";
int i = next;
while (readEnd(next, end, next))
{
int len = end - i;
if (len == 0)
{
//line is empty, data starts now
nextDataStart = next;
formatDetected = true;
scanpos = 0;
break;
}
if (len > 15)
{
string s((char *)&buffer[i], len);
if (Utils::strStartsWith(s, "Content-Length", Utils::CaseInsensitive))
{
Utils::from_string(s.substr(15), nextContentLength);
cDebugDom("camera") << "Found content length header: \"" << nextContentLength << "\"";
//nextContentLength = -1; //to test code without content-length header
}
}
i = next;
}
if (!formatDetected)
{
cWarningDom("camera") << "need more data...";
return;
}
}
if (formatDetected && !single_frame)
{
//we should be positionned at the start of data
//small check to be sure
if (buffer.size() <= nextDataStart)
{
cWarningDom("camera") << "need more data...";
return;
}
if (!(buffer[nextDataStart] == 0xFF && buffer[nextDataStart + 1] == 0xD8))
{
cWarningDom("camera") << "Wrong image data.";
format_error = true;
EcoreTimer::singleShot(0, [=]()
{
cDebugDom("camera") << "Cancel stream";
ecore_con_url_free(ecurl);
ecurl = nullptr;
});
return;
}
if (nextContentLength >= 0)
{
//the content-length is known, fast path
if ((int)buffer.size() < nextContentLength + nextDataStart + 2)
return; //need more data
cDebugDom("camera") << "Set new frame";
evas_object_image_memfile_set(camImage, &buffer[nextDataStart], nextContentLength, NULL, NULL);
//evas_object_image_size_get(camImage, &w, &h);
if (buffer[nextDataStart + nextContentLength] == '\r') //assume a \n always follows \r
nextContentLength += 2;
else if (buffer[nextDataStart + nextContentLength] == '\n')
nextContentLength += 1;
//remove unused data from buffer
auto iter = buffer.begin();
buffer.erase(iter, iter + (nextDataStart + nextContentLength));
//reset for next frame
nextContentLength = -1;
formatDetected = false;
nextDataStart = 0;
scanpos = 0;
}
else
{
uint i = 0;
cDebugDom("camera") << "scanpos: " << scanpos;
for (i = nextDataStart + scanpos;
i < buffer.size() - boundary.length();i++)
{
if (buffer[i] == '-' && buffer[i + 1] == '-' &&
!boundary.compare(0, boundary.length(), (const char *)&buffer[i], boundary.length()))
{
//boundary found
//check for newline between boundary and data
nextContentLength = i - nextDataStart;
if (buffer[i - 2] == '\r')
nextContentLength -= 2;
else if (buffer[i - 1] == '\n')
nextContentLength -= 1;
evas_object_image_memfile_set(camImage, &buffer[nextDataStart], nextContentLength, NULL, NULL);
//evas_object_image_size_get(camImage, &w, &h);
if (buffer[nextDataStart + nextContentLength] == '\r') //assume a \n always follows \r
nextContentLength += 2;
else if (buffer[nextDataStart + nextContentLength] == '\n')
nextContentLength += 1;
//remove unused data from buffer
auto iter = buffer.begin();
buffer.erase(iter, iter + (nextDataStart + nextContentLength));
//reset for next frame
nextContentLength = -1;
formatDetected = false;
nextDataStart = 0;
scanpos = 0;
cDebugDom("camera") << "scanpos: " << scanpos << " --> return";
return;
}
}
scanpos = i - nextDataStart;
cDebugDom("camera") << "--> scanpos: " << scanpos;
}
}
}
