Videoflip element to Visionworks

Hello,

I would like to add videoflip element to pipeline. I dont have problem when I rotate 180 degrees because the height and width values doesnt change but if I rotate for 90 degrees then I get error in the run time due to mismatch of dimensions.

I think if I can add the element just after the v4l2src element I would not have problem. I now add the videoflip element just before sink element.

I could not find the right gstreamer mentality to add it after the v4l2src. My goal is to rotate 90 degrees.

Thanks

here is my modified code in GStreamerCameraFrameSourceImpl.cpp

modified parts:

// create videoflip convert element
GstElement * videoflip = gst_element_factory_make("videoflip", nullptr);
if (!videoflip)
{
    NVXIO_PRINT("Cannot create %s element", "videoflip");
    FinalizeGstPipeLine();

    return false;
}

g_object_set(G_OBJECT(videoflip),
             "method",2,
             nullptr);
gst_bin_add(GST_BIN(pipeline), videoflip);

stream << “video/x-raw, width=640, height=512, format=(string)I420;”;

// link elements
if (!gst_element_link_many(color,videoflip, sink))
{
    NVXIO_PRINT("GStreamer: cannot link color -> appsink");
    FinalizeGstPipeLine();

    return false;
}

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#ifdef USE_GSTREAMER

#include “FrameSource/GStreamer/GStreamerCameraFrameSourceImpl.hpp”

#include <gst/app/gstappsink.h>

#include

namespace nvidiaio
{

GStreamerCameraFrameSourceImpl::GStreamerCameraFrameSourceImpl(uint cameraIdx_) :
GStreamerBaseFrameSourceImpl(nvxio::FrameSource::CAMERA_SOURCE, “GstreamerCameraFrameSource”),
cameraIdx(cameraIdx_)
{
}

bool GStreamerCameraFrameSourceImpl::setConfiguration(const Parameters& params)
{
NVXIO_ASSERT(end);

configuration.frameHeight = params.frameHeight;
configuration.frameWidth = params.frameWidth;
configuration.fps = params.fps;

NVXIO_ASSERT((params.format == NVXCU_DF_IMAGE_NV12) ||
             (params.format == NVXCU_DF_IMAGE_U8) ||
             (params.format == NVXCU_DF_IMAGE_RGB) ||
             (params.format == NVXCU_DF_IMAGE_RGBX)||
             (params.format == NVXCU_DF_IMAGE_NONE));

configuration.format = params.format;

return true;

}

bool GStreamerCameraFrameSourceImpl::InitializeGstPipeLine()
{
GstStateChangeReturn status;
end = true;

pipeline = GST_PIPELINE(gst_pipeline_new(nullptr));
if (!pipeline)
{
    NVXIO_PRINT("Cannot create Gstreamer pipeline");
    return false;
}

bus = gst_pipeline_get_bus(GST_PIPELINE (pipeline));

// create v4l2src
GstElement * v4l2src = gst_element_factory_make("v4l2src", nullptr);
if (!v4l2src)
{
    NVXIO_PRINT("Cannot create v4l2src");
    FinalizeGstPipeLine();

    return false;
}

std::ostringstream cameraDev;
cameraDev << "/dev/video" << cameraIdx;
g_object_set(G_OBJECT(v4l2src), "device", cameraDev.str().c_str(), nullptr);

gst_bin_add(GST_BIN(pipeline), v4l2src);

// create videoflip convert element
GstElement * videoflip = gst_element_factory_make("videoflip", nullptr);
if (!videoflip)
{
    NVXIO_PRINT("Cannot create %s element", "videoflip");
    FinalizeGstPipeLine();

    return false;
}

g_object_set(G_OBJECT(videoflip),
             "method",2,
             nullptr);
gst_bin_add(GST_BIN(pipeline), videoflip);

// create color convert element
GstElement * color = gst_element_factory_make(COLOR_ELEM, nullptr);
if (!color)
{
    NVXIO_PRINT("Cannot create %s element", COLOR_ELEM);
    FinalizeGstPipeLine();

    return false;
}

gst_bin_add(GST_BIN(pipeline), color);



// create appsink element
sink = gst_element_factory_make("appsink", nullptr);
if (!sink)
{
    NVXIO_PRINT("Cannot create appsink element");
    FinalizeGstPipeLine();

    return false;
}

#if FULL_GST_VERSION >= VERSION_NUM(1,7,2)
g_object_set(GST_ELEMENT(sink), “wait-on-eos”, FALSE, nullptr);
#endif

gst_bin_add(GST_BIN(pipeline), sink);

// if initial values for FrameSource::Parameters are not
// specified, let's set them manually to prevent very huge images
if (configuration.frameWidth == (vx_uint32)-1)
    configuration.frameWidth = 1920;
if (configuration.frameHeight == (vx_uint32)-1)
    configuration.frameHeight = 1080;
if (configuration.fps == (vx_uint32)-1)
    configuration.fps = 30;

#if GST_VERSION_MAJOR == 0
std::unique_ptr<GstCaps, GStreamerObjectDeleter> caps_v42lsrc(
gst_caps_new_simple (“video/x-raw-rgb”,
“width”, GST_TYPE_INT_RANGE, 1, (int)configuration.frameWidth,
“height”, GST_TYPE_INT_RANGE, 1, (int)configuration.frameHeight,
“framerate”, GST_TYPE_FRACTION, (int)configuration.fps,
nullptr));
#else
std::ostringstream stream;
stream << “video/x-raw, width=640, height=512, format=(string)I420;”;//stream << “video/x-raw, format=(string){RGB}, width=[1,” << configuration.frameWidth <<"], height=[1," << configuration.frameHeight << “], framerate=” << configuration.fps << “/1;”;

std::unique_ptr<GstCaps, GStreamerObjectDeleter> caps_v42lsrc(gst_caps_from_string(stream.str().c_str()));

#endif

if (!caps_v42lsrc)
{
    NVXIO_PRINT("Failed to create caps");
    FinalizeGstPipeLine();

    return false;
}

// link elements
if (!gst_element_link_filtered(v4l2src, color, caps_v42lsrc.get()))
{
    NVXIO_PRINT("GStreamer: cannot link v4l2src -> color using caps");
    FinalizeGstPipeLine();

    return false;
}

// link elements
if (!gst_element_link_many(color,videoflip, sink))
{
    NVXIO_PRINT("GStreamer: cannot link color -> appsink");
    FinalizeGstPipeLine();

    return false;
}

gst_app_sink_set_max_buffers (GST_APP_SINK(sink), 1);
gst_app_sink_set_drop (GST_APP_SINK(sink), true);

// do not emit signals: all calls will be synchronous and blocking
gst_app_sink_set_emit_signals (GST_APP_SINK(sink), 0);

#if GST_VERSION_MAJOR == 0
std::unique_ptr<GstCaps, GStreamerObjectDeleter> caps_appsink;

if (configuration.format == NVXCU_DF_IMAGE_U8)
{
    caps_appsink.reset(gst_caps_new_simple("video/x-raw-gray",
                                           "bpp",        G_TYPE_INT, 8,
                                           nullptr));
}
else if (configuration.format == NVXCU_DF_IMAGE_RGB)
{
    caps_appsink.reset(gst_caps_new_simple("video/x-raw-rgb",
                                           "bpp",        G_TYPE_INT, 24,
                                           "red_mask",   G_TYPE_INT, 0xFF0000,
                                           "green_mask", G_TYPE_INT, 0x00FF00,
                                           "blue_mask",  G_TYPE_INT, 0x0000FF,
                                           nullptr));
}
else if (configuration.format == NVXCU_DF_IMAGE_RGBX ||
         configuration.format == NVXCU_DF_IMAGE_NONE)
{
    caps_appsink.reset(gst_caps_new_simple("video/x-raw-rgb",
                                           "depth",      G_TYPE_INT, 32,
                                           "bpp",        G_TYPE_INT, 32,
                                           "endianness", G_TYPE_INT, 4321,
                                           "red_mask",   G_TYPE_INT, 0xFF000000,
                                           "green_mask", G_TYPE_INT, 0x00FF0000,
                                           "blue_mask",  G_TYPE_INT, 0x0000FF00,
                                           "alpha_mask", G_TYPE_INT, 0x000000FF,
                                           nullptr));
}
else if (configuration.format == NVXCU_DF_IMAGE_NV12)
{
    caps_appsink.reset(gst_caps_new_simple("video/x-raw-yuv",
                                           "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('N', 'V', '1', '2'),
                                           nullptr));
}
else
    NVXIO_THROW_EXCEPTION("Unsupported image format");

#else
std::string caps_string(“video/x-raw, format=(string){”);
if (configuration.format == NVXCU_DF_IMAGE_U8)
caps_string += “GRAY8”;
else if (configuration.format == NVXCU_DF_IMAGE_RGB)
caps_string += “RGB”;
else if (configuration.format == NVXCU_DF_IMAGE_RGBX ||
configuration.format == NVXCU_DF_IMAGE_NONE)
caps_string += “RGBA”;
else if (configuration.format == NVXCU_DF_IMAGE_NV12)
caps_string += “NV12”;
else
NVXIO_THROW_EXCEPTION(“Unsupported image format”);

caps_string += "};";

std::unique_ptr<GstCaps, GStreamerObjectDeleter> caps_appsink(
        gst_caps_from_string(caps_string.c_str()));

#endif
gst_app_sink_set_caps(GST_APP_SINK(sink), caps_appsink.get());

// Force pipeline to play video as fast as possible, ignoring system clock
gst_pipeline_use_clock(pipeline, nullptr);
//GstElement *pipeline1 = gst_parse_launch("v4l2src device=/dev/video1 ! videoflip method=1 ! video/x-raw, width=640, height=512, format=(string)I420 ! appsink",NULL);
status = gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_PLAYING);
handleGStreamerMessages();

if (status == GST_STATE_CHANGE_ASYNC)
{
    // wait for status update
    status = gst_element_get_state(GST_ELEMENT(pipeline), nullptr, nullptr, GST_CLOCK_TIME_NONE);
}
if (status == GST_STATE_CHANGE_FAILURE)
{
    NVXIO_PRINT("GStreamer: unable to start playback");
    FinalizeGstPipeLine();

    return false;
}

// GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(pipeline), GST_DEBUG_GRAPH_SHOW_ALL, "pipeline");

// explicitly set params to -1 to ensure
// their update in the updateConfiguration() function
configuration.frameWidth = (uint32_t)-1;
configuration.frameHeight = (uint32_t)-1;
configuration.fps = (uint32_t)-1;

if (!updateConfiguration(sink, color, configuration))
{
    FinalizeGstPipeLine();
    return false;
}

end = false;

return true;

}

} // namespace nvidiaio

#endif // USE_GSTREAMER

Hi,
We support 90-degree rotation in nvvidconv plguin. Please set the property:

  flip-method         : video flip methods
                        flags: readable, writable, controllable
                        Enum "GstNvVideoFlipMethod" Default: 0, "none"
                           (0): none             - Identity (no rotation)
                           (1): counterclockwise - Rotate counter-clockwise 90 degrees
                           (2): rotate-180       - Rotate 180 degrees
                           (3): clockwise        - Rotate clockwise 90 degrees
                           (4): horizontal-flip  - Flip horizontally
                           (5): upper-right-diagonal - Flip across upper right/lower left diagonal
                           (6): vertical-flip    - Flip vertically
                           (7): upper-left-diagonal - Flip across upper left/lower right diagonal