#include <stdbool.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_video.h>
#include <SDL2/SDL_render.h>
#include <SDL2/SDL_events.h>
#include <gst/gst.h>
#include <gst/app/gstappsink.h>
#include <gst/video/video-frame.h>
#include <glib.h>
#define WINDOW_WIDTH 1280
#define WINDOW_HEIGHT 720
SDL_Window* window = NULL;
SDL_Renderer* renderer = NULL;
SDL_Texture* videoTexture = NULL;
SDL_Rect playerrect;
static GstFlowReturn
new_sample_cb (GstAppSink *appsink, gpointer data)
{
GstSample* sample;
GstVideoFrame v_frame;
GstVideoInfo v_info;
GstBuffer *buf;
GstCaps *caps;
guint8 *pixels;
guint stride;
//g_debug("New sample/frame.");
sample = gst_app_sink_pull_sample (appsink);
g_assert_nonnull (sample);
buf = gst_sample_get_buffer (sample);
g_assert_nonnull (buf);
caps = gst_sample_get_caps (sample);
g_assert_nonnull (caps);
g_assert (gst_video_info_from_caps (&v_info, caps));
//g_debug("Caps: %s", gst_caps_to_string(caps));
g_assert (gst_video_frame_map (&v_frame, &v_info, buf, GST_MAP_READ));
pixels = (guint8 *) GST_VIDEO_FRAME_PLANE_DATA (&v_frame, 0);
//g_debug("Got pixels (%p).", pixels);
stride = GST_VIDEO_FRAME_PLANE_STRIDE (&v_frame, 0);
//g_debug("Got stride (%d).", stride);
g_assert (SDL_UpdateTexture(videoTexture, &playerrect, pixels, stride) == 0);
//g_debug("Updated texture.");
SDL_RenderCopy (renderer, videoTexture, NULL, NULL);
//g_debug("Copied texture");
SDL_RenderPresent (renderer);
g_debug("Rendered!");
gst_video_frame_unmap (&v_frame);
gst_sample_unref (sample);
return GST_FLOW_OK;
}
int main(int argc, char* argv[]) {
// Initialize SDL
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
return 1;
}
// Adjust window size to fit the top right quarter of the screen
SDL_DisplayMode DM;
SDL_GetCurrentDisplayMode(0, &DM);
int screenWidth = DM.w;
int screenHeight = DM.h;
g_debug("Detected display 0: %d x %d", screenWidth, screenHeight);
playerrect = (SDL_Rect){0, 0, 352, 288};
// Create window
window = SDL_CreateWindow("Quadrant Application",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
WINDOW_WIDTH, WINDOW_HEIGHT,
SDL_WINDOW_OPENGL);
if (window == NULL) {
g_debug("Window could not be created! SDL_Error: %s\n", SDL_GetError());
return 1;
}
// Create renderer
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE /*SDL_RENDERER_ACCELERATED SDL_RENDERER_PRESENTVSYNC 0*/);
if (renderer == NULL) {
g_debug("Renderer could not be created! SDL_Error: %s\n", SDL_GetError());
return 1;
}
// Check available drivers
SDL_RendererInfo info;
int ndrv = SDL_GetNumRenderDrivers();
for (int idx = 0; idx < ndrv; idx++) {
SDL_GetRenderDriverInfo(idx,&info);
g_debug("Driver %d : %s", idx, info.name);
}
g_debug("Current video driver: %s", SDL_GetCurrentVideoDriver());
SDL_GetRendererInfo(renderer, &info);
g_debug("Rendering driver: %s", info.name);
videoTexture = SDL_CreateTexture (renderer, SDL_PIXELFORMAT_IYUV,
SDL_TEXTUREACCESS_TARGET, screenWidth, screenHeight);
if(!videoTexture)
{
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"Couldn't create texture: %s", SDL_GetError());
return 0;
}
// Clear screen
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
g_debug("Starting pipeline");
// Initialize GStreamer
g_debug("GST init");
gst_init(&argc, &argv);
// Create GStreamer pipeline
g_debug("GST Parse launch");
GstElement* pipeline = gst_parse_launch("rtspsrc location=rtsp://username:password@127.0.0.1:8554/mystream ! rtph264depay ! h264parse ! avdec_h264 ! videoconvert ! appsink name=videosink", NULL);
// Retrieve the video sink from the pipeline
GstAppSink* videoSink = (GstAppSink*) gst_bin_get_by_name(GST_BIN(pipeline), "videosink");
// Set up a callback to receive new video frames
g_debug("GST Setting frame callback (%p)", videoSink);
gst_app_sink_set_drop(videoSink, TRUE);
gst_app_sink_set_max_buffers(videoSink, 64);
gst_app_sink_set_emit_signals(videoSink, TRUE);
g_signal_connect(videoSink, "new-sample", G_CALLBACK(new_sample_cb), NULL);
gst_object_unref(videoSink);
// Start playing the pipeline
g_debug("GST Set to ready");
gst_element_set_state(pipeline, GST_STATE_READY);
g_debug("GST Set to playing");
gst_element_set_state(pipeline, GST_STATE_PLAYING);
g_debug("Pipeline playing");
// Main loop flag
bool quit = false;
// Event handler
SDL_Event e;
// Main loop
while (!quit) {
// Handle events on queue
while (SDL_PollEvent(&e) != 0) {
// User requests quit
if (e.type == SDL_QUIT) {
quit = true;
}
}
}
// Destroy window
SDL_DestroyWindow(window);
// Quit SDL subsystems
SDL_Quit();
return 0;
}
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