Base on example 12_camera_v4l2_cuda,I wonder to overlay Chinese character string instead of drawing a black box in the upper left corner,I changes code as below:
1、 In file camera_v4l2_cuda.cpp(line 556 start):
change function
static bool conv_capture_dqbuf_thread_callback(struct v4l2_buffer *v4l2_buf,
NvBuffer * buffer, NvBuffer * shared_buffer,
void *arg)
{
context_t *ctx = (context_t *) arg;
if (ctx->enable_cuda)
{
// Create EGLImage from dmabuf fd
ctx->egl_image = NvEGLImageFromFd(ctx->egl_display, buffer->planes[0].fd);
if (ctx->egl_image == NULL)
ERROR_RETURN("Failed to map dmabuf fd (0x%X) to EGLImage",
buffer->planes[0].fd);
// Running algo process with EGLImage via GPU multi cores
HandleEGLImage(&ctx->egl_image);
// Destroy EGLImage
NvDestroyEGLImage(ctx->egl_display, ctx->egl_image);
ctx->egl_image = NULL;
}
// Render the frame into display
if (v4l2_buf->m.planes[0].bytesused)
ctx->renderer->render(buffer->planes[0].fd);
if (ctx->conv->capture_plane.qBuffer(*v4l2_buf, buffer) < 0)
{
abort(ctx);
ERROR_RETURN("Failed to queue buffer on VIC capture plane");
}
return true;
}
to
static bool conv_capture_dqbuf_thread_callback(struct v4l2_buffer *v4l2_buf,
NvBuffer * buffer, NvBuffer * shared_buffer,
void *arg)
{
context_t *ctx = (context_t *) arg;
if (ctx->enable_cuda)
{
ctx->renderer->setOverlayText("显示中文", 50, 50)；
}
// Render the frame into display
if (v4l2_buf->m.planes[0].bytesused)
ctx->renderer->render(buffer->planes[0].fd);
if (ctx->conv->capture_plane.qBuffer(*v4l2_buf, buffer) < 0)
{
abort(ctx);
ERROR_RETURN("Failed to queue buffer on VIC capture plane");
}
return true;
}
when using ctx->renderer->setOverlayText(“abcde”, 50, 50)； the result is what I want,on video string “abcde” overlay displayed on video.
2、 in file NvEglRenderer.cpp
in function NvEglRenderer::NvEglRenderer(const char *name, uint32_t width, uint32_t height,
uint32_t x_offset, uint32_t y_offset)
:NvElement(name, valid_fields)
change
fontinfo = XLoadQueryFont(x_display, “9x15bold”);
to
fontinfo = XLoadQueryFont(x_display, “hanzigb16fs”);
hanzigb16fs means “-isas-fangsong ti-medium-r-normal–16-160-72-72-c-160-gb2312.1980-0”
(etc——>x11——>fonts——>misc——>xfonts-base.alias)
there is nothing overlay displayed on video.
what else should I to do?
thanks!