编译:
g++ demo666.cc -o demo666 `pkg-config --cflags --libs gstreamer-1.0 opencv4`
运行:
./demo666
代码:
#include <gst/gst.h>
#include <opencv2/core/types_c.h>
#include <opencv2/highgui.hpp>
#include <time.h>
#include <string>
#include <iostream>
using namespace cv;
using namespace std;
typedef struct _CustomData {
GstElement *pipeline;
GstElement *source;
GstElement *depay;
GstElement *queue;
GstElement *parse;
GstElement *avdec;
GstElement *conv;
GstElement *encoder;
GstElement *convert;
GstElement *sink;
GMainLoop *main_loop;
} CustomData;
static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
GError *err;
gchar *debug_info;
gst_message_parse_error (msg, &err, &debug_info);
g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
g_clear_error (&err);
g_free (debug_info);
g_main_loop_quit (data->main_loop);
}
static void pad_added_handler (GstElement *src, GstPad *new_pad, CustomData *data) {
GstPad *sink_pad = gst_element_get_static_pad (data->depay, "sink");
GstPadLinkReturn ret;
GstCaps *new_pad_caps = NULL;
GstStructure *new_pad_struct = NULL;
const gchar *new_pad_type = NULL;
g_print ("Received new pad '%s' from '%s':\n", GST_PAD_NAME (new_pad), GST_ELEMENT_NAME (src));
if (gst_pad_is_linked (sink_pad)) {
g_print ("We are already linked. Ignoring.\n");
goto exit;
}
new_pad_caps = gst_pad_get_current_caps (new_pad);
new_pad_struct = gst_caps_get_structure (new_pad_caps, 0);
new_pad_type = gst_structure_get_name (new_pad_struct);
ret = gst_pad_link (new_pad, sink_pad);
if (GST_PAD_LINK_FAILED (ret)) {
g_print ("Type is '%s' but link failed.\n", new_pad_type);
} else {
g_print ("Link succeeded (type '%s').\n", new_pad_type);
}
exit:
if (new_pad_caps != NULL)
gst_caps_unref (new_pad_caps);
gst_object_unref (sink_pad);
}
static GstFlowReturn new_sample (GstElement *sink, gpointer user_data){
GstSample *sample;
GstBuffer *buffer;
GstCaps *caps;
GstStructure *s;
gint width, height;
g_signal_emit_by_name (sink, "pull-sample", &sample);
if (sample){
g_print ("* ");
caps = gst_sample_get_caps (sample);
if (!caps) {
g_print ("gst_sample_get_caps fail\n");
gst_sample_unref (sample);
return GST_FLOW_ERROR;
}
s = gst_caps_get_structure (caps, 0);
gboolean res;
res = gst_structure_get_int (s, "width", &width);
g_print ("width: %d, ", width);
res |= gst_structure_get_int (s, "height", &height);
g_print ("height: %d \n", height);
if (!res) {
g_print ("gst_structure_get_int fail\n");
gst_sample_unref (sample);
return GST_FLOW_ERROR;
}
buffer = gst_sample_get_buffer (sample);
if(!buffer){
g_print ("gst_sample_get_buffer fail\n");
gst_sample_unref (sample);
return GST_FLOW_ERROR;
}
GstMapInfo map;
if (gst_buffer_map (buffer, &map, GST_MAP_READ)){
g_print("jpg size = %ld \n", map.size);
cv::Mat src(Size(width, height), CV_8UC3, (char*)map.data, Mat::AUTO_STEP);
time_t timep;
time(&timep);
printf("%s", ctime(&timep));
string ss = ".jpg";
string filename = ctime(&timep) + ss ;
cv::imwrite(filename, src);
gst_buffer_unmap (buffer, &map);
}
gst_sample_unref (sample);
return GST_FLOW_OK;
}
return GST_FLOW_OK ;
}
#define CAPS "video/x-raw,format=BGR"
int main(int argc, char *argv[]) {
CustomData data;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
gboolean terminate = FALSE;
gst_init (&argc, &argv);
g_printerr("gst_init \n");
data.source = gst_element_factory_make ("rtspsrc", "source");
g_object_set (G_OBJECT (data.source), "latency", 2000, NULL);
data.depay = gst_element_factory_make ("rtph264depay", "depay");
data.queue = gst_element_factory_make ("queue", "Queue");
data.parse = gst_element_factory_make ("h264parse", "parse");
data.avdec = gst_element_factory_make ("nvv4l2decoder", "decoder");
data.conv = gst_element_factory_make ("nvvidconv", "convert");
data.encoder = gst_element_factory_make("nvv4l2h264enc", "encoder");
data.convert = gst_element_factory_make("videoconvert","Videoconvert");
data.sink = gst_element_factory_make ("appsink", "sink");
g_printerr("gst element factory make \n");
GstCaps *video_caps;
gchar *video_caps_text;
video_caps_text = g_strdup_printf (CAPS);
video_caps = gst_caps_from_string (video_caps_text);
if(!video_caps){
g_printerr("gst_caps_from_string fail\n");
return -1;
}
g_object_set (data.source, "location", "rtsp://Deepcong:666@192.115.8.52:8554/0", NULL);
g_signal_connect (data.source, "pad-added", G_CALLBACK (pad_added_handler), &data);
g_object_set (data.sink, "caps", video_caps, NULL);
g_object_set (data.sink, "emit-signals", TRUE, NULL);
g_signal_connect (data.sink, "new-sample", G_CALLBACK (new_sample), &data);
g_printerr("gst signal connect \n");
data.pipeline = gst_pipeline_new ("test-pipeline");
if (!data.pipeline || !data.source ||!data.depay || !data.queue ||!data.parse || !data.avdec || !data.conv || !data.encoder ||!data.convert || !data.sink) {
g_printerr ("Not all elements could be created.\n");
return -1;
}
gst_bin_add_many (GST_BIN (data.pipeline), data.source, data.depay, data.queue, data.parse, data.avdec, data.conv, data.convert,data.sink, NULL);
if (!gst_element_link_many ( data.depay,data.queue,data.parse, data.avdec,data.conv, data.convert,data.sink,NULL)) {
g_printerr ("Elements could not be linked.\n");
gst_object_unref (data.pipeline);
return -1;
}
bus = gst_element_get_bus (data.pipeline);
gst_bus_add_signal_watch (bus);
g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, &data);
gst_object_unref (bus);
ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (data.pipeline);
return -1;
}
data.main_loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (data.main_loop);
gst_object_unref (bus);
gst_element_set_state (data.pipeline, GST_STATE_NULL);
gst_object_unref (data.pipeline);
return 0;
}
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