access buf

CMakeLists.txt

@@ -10,6 +10,7 @@ add_definitions(-DCMAKE_EXPORT_COMPILE_COMMANDS=ON)
 # Find packages go here.
 find_package(PkgConfig) 
 find_package(Threads REQUIRED)
+find_package(OpenSSL REQUIRED)
 pkg_search_module(GLIB REQUIRED glib-2.0) 
 pkg_check_modules(GSTREAMER REQUIRED gstreamer-1.0)
 
@@ -29,3 +30,4 @@ target_link_libraries(gst-peek ${GSTREAMER_LIBRARIES})
 target_link_libraries(gst-peek ${GSTREAMER_APP_LIBRARIES})
 target_link_libraries(gst-peek ${GSTREAMER_VIDEO_LIBRARIES} )
 target_link_libraries(gst-peek Threads::Threads)
+target_link_libraries(gst-peek OpenSSL::Crypto)

src/main.cpp

@@ -1,24 +1,180 @@
+#include "gst/gstdebugutils.h"
+#include <cstdint>
 #include <iostream>
-#include <thread>
 #include <memory>
+#include <thread>
+#include <vector>
+#include <iomanip>
 
 extern "C" {
 #include <glib.h>
 #include <gst/gst.h>
 #include <unistd.h>
+#include <openssl/evp.h>
 }
 
+  struct elements {
+    GstElement *src;
+    GstElement *decode;
+    GstElement *tee;
+    GstElement *appqueue;
+    GstElement *videoqueue;
+    GstElement *appsink;
+    GstElement *videosink;
+  };
 
-void newPipeline(const char * addr) {
+  struct appsink_data {
+    EVP_MD_CTX* mdctx;
+    std::vector<uint8_t> digest;
+  };
 
-  GstElement *pipeline = nullptr;
+void digest(EVP_MD_CTX* ctx, std::vector<uint8_t> data, std::vector<uint8_t>& digest) {
-  GstBus *bus = nullptr;
+
+}
+
+static GstFlowReturn new_sample(GstElement *sink, appsink_data* appsink_data) {
+  GstSample *sample;
+
+  g_signal_emit_by_name(sink, "pull-sample", &sample);
+  if (sample) {
+    g_print("*");
+    GstBuffer* buf = gst_sample_get_buffer(sample);
+    GstMemory* mem = gst_buffer_get_all_memory(buf);
+    EVP_DigestUpdate(appsink_data->mdctx, &(mem->offset), static_cast<size_t>(mem->size));
+    gst_sample_unref(sample);
+    return GST_FLOW_OK;
+  }
+
+  return GST_FLOW_ERROR;
+}
+
+static void cb_new_pad (GstElement *element, GstPad *pad, gpointer data)
+{
+  gchar *name;
+  GstElement *other = static_cast<GstElement*>(data);
+
+  name = gst_pad_get_name (pad);
+  g_print ("A new pad %s was created for %s\n", name, gst_element_get_name(element));
+  g_free (name);
+
+  g_print ("element %s will be linked to %s\n",
+           gst_element_get_name(element),
+           gst_element_get_name(other));
+  gst_element_link(element, other);
+}
+
+void newPipeline() {
+
+  GstElement *pipeline;
+  GstBus *bus;
   GstMessage *msg = nullptr;
 
+
+
+  struct appsink_data appsink_data;
+  struct elements pipe;
+
+  appsink_data.mdctx = EVP_MD_CTX_new();
+  appsink_data.digest = std::vector<uint8_t>(32);
+
+	if(1 != EVP_DigestInit_ex(appsink_data.mdctx, EVP_sha256(), NULL)) {
+		std::cerr << "Error intializing digest" << std::endl;
+  }
+
   // gstreamer initialization
   gst_init(nullptr, nullptr);
 
+  pipeline = gst_pipeline_new("peekpipeline");
+
+  // creating elements
+  pipe.src = gst_element_factory_make("filesrc", "src");
+  pipe.decode = gst_element_factory_make("decodebin", "decode");
+  pipe.tee = gst_element_factory_make("tee", "tee");
+  pipe.appqueue = gst_element_factory_make("queue", "appqueue");
+  pipe.videoqueue = gst_element_factory_make("queue", "videoqueue");
+  pipe.appsink = gst_element_factory_make("appsink", "appsink");
+  pipe.videosink = gst_element_factory_make("autovideosink", "videosink");
+
+  gst_bin_add(GST_BIN(pipeline),
+              static_cast<GstElement *>(gst_object_ref(pipe.src)));
+  gst_bin_add(GST_BIN(pipeline),
+              static_cast<GstElement *>(gst_object_ref(pipe.decode)));
+  gst_bin_add(GST_BIN(pipeline),
+              static_cast<GstElement *>(gst_object_ref(pipe.tee)));
+  gst_bin_add(GST_BIN(pipeline),
+              static_cast<GstElement *>(gst_object_ref(pipe.appqueue)));
+  gst_bin_add(GST_BIN(pipeline),
+              static_cast<GstElement *>(gst_object_ref(pipe.videoqueue)));
+  gst_bin_add(GST_BIN(pipeline),
+              static_cast<GstElement *>(gst_object_ref(pipe.appsink)));
+  gst_bin_add(GST_BIN(pipeline),
+              static_cast<GstElement *>(gst_object_ref(pipe.videosink)));
+
+  // linking elements
+  gst_element_link(pipe.src, pipe.decode);
+  g_signal_connect (pipe.decode, "pad-added", G_CALLBACK (cb_new_pad), pipe.tee);
+
+
+  auto teeSrcTpl = gst_element_class_get_pad_template(
+      GST_ELEMENT_GET_CLASS(pipe.tee), "src_%u");
+  auto apppad = gst_element_request_pad(pipe.tee, teeSrcTpl, nullptr, nullptr);
+  auto videopad =
+      gst_element_request_pad(pipe.tee, teeSrcTpl, nullptr, nullptr);
+  if (gst_pad_link(apppad, gst_element_get_static_pad(pipe.appqueue, "sink")) !=
+      GST_PAD_LINK_OK) {
+    std::cerr << "Error linking appqueue" << std::endl;
+  }
+
+  if (gst_pad_link(videopad, gst_element_get_static_pad(
+                                 pipe.videoqueue, "sink")) != GST_PAD_LINK_OK) {
+    std::cerr << "Error linking videoqueue" << std::endl;
+  }
+
+  gst_element_link(pipe.appqueue, pipe.appsink);
+  gst_element_link(pipe.videoqueue, pipe.videosink);
+
+  // configuring filesrc
+  g_object_set(pipe.src, "location", "/home/moritz/Downloads/Big_Buck_Bunny_1080_10s_10MB.mp4", nullptr);
+
+  // configuring appsink
+  GstCaps *caps = gst_caps_new_simple(
+      "video/x-raw", NULL);
+  g_object_set(pipe.appsink, "emit-signals", TRUE, "caps", caps, nullptr);
+  g_signal_connect (pipe.appsink, "new-sample", G_CALLBACK (new_sample), &appsink_data);
+
+  gst_element_set_state(pipeline, GST_STATE_PLAYING);
+
+  bus = gst_element_get_bus(pipeline);
+  bool shouldRun = true;
+  while (shouldRun) {
+    msg = gst_bus_timed_pop(bus, 10000);
+    if (msg) {
+
+      switch (GST_MESSAGE_TYPE(msg)) {
+      case GST_MESSAGE_ERROR:
+        std::cerr << "Error occured" << std::endl;
+        shouldRun = false;
+        break;
+      case GST_MESSAGE_EOS:
+        std::cerr << "EOS occured" << std::endl;
+        shouldRun = false;
+        break;
+      default:
+        break;
+      }
+    }
+  }
+
+  unsigned char hash[EVP_MAX_MD_SIZE];
+  unsigned int md_len = EVP_MAX_MD_SIZE;
+
+	EVP_DigestFinal_ex(appsink_data.mdctx, hash, &md_len);
+
+  for (auto& el : hash)
+  	std::cout << std::setfill('0') << std::setw(2) << std::hex << (0xff & (unsigned int)el);
+  std::cout << '\n';
   
+
   return;
 }
 
@@ -26,6 +182,7 @@ int main(void) {
 
   std::cout << "Hello GStreamer-Peek" << std::endl;
 
-  
+  newPipeline();
+
   return 0;
 }