93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
#include "gst/gstbin.h"
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#include "gst/gstbus.h"
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#include "gst/gstclock.h"
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#include "gst/gstelement.h"
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#include "gst/gstelementfactory.h"
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#include "gst/gstmessage.h"
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#include "gst/gstobject.h"
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#include "gst/gstpipeline.h"
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#include "gst/gstutils.h"
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#include <gst/gst.h>
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typedef struct _CustomData {
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GstElement *pipeline;
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GstElement *source;
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} CustomData;
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int main(int argc, char *argv[]) {
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GstBus *bus;
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GstMessage *msg;
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GstElement *video_queue;
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GstElement *video_convert;
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GstElement *video_sink;
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CustomData data;
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GstStateChangeReturn ret;
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gboolean terminate = FALSE;
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gst_init(&argc, &argv);
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data.source = gst_element_factory_make("v4l2src", "source");
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video_queue = gst_element_factory_make("queue", "video_queue");
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video_convert = gst_element_factory_make("videoconvert", "video_convert");
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video_sink = gst_element_factory_make("autovideosink", "video_sink");
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data.pipeline = gst_pipeline_new("media-pipeline");
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if (!data.source || !video_queue || !video_convert || !video_sink || !data.pipeline) {
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g_printerr("Couldn't create all elements.\n");
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return -1;
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}
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g_object_set(data.source, "device", "/dev/video2", NULL);
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gst_bin_add_many(GST_BIN(data.pipeline), data.source, video_queue, video_convert, video_sink, NULL);
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if (!gst_element_link_many(data.source, video_queue, video_convert, video_sink, NULL)) {
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g_printerr("Couldn't link stream elements.\n");
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gst_object_unref(data.pipeline);
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return -1;
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}
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ret = gst_element_set_state(data.pipeline, GST_STATE_PLAYING);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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g_printerr("Failed to start playing.\n");
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return -1;
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}
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bus = gst_element_get_bus(data.pipeline);
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do {
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msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
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switch (GST_MESSAGE_TYPE(msg)) {
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case GST_MESSAGE_ERROR: {
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GError *err;
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gchar *debug_info;
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gst_message_parse_error(msg, &err, &debug_info);
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g_printerr("Error received from element %s: %s\n", GST_ELEMENT_NAME(msg->src), err->message);
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g_printerr("Debug info: %s\n", debug_info ? debug_info : "none");
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g_error_free(err);
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g_free(debug_info);
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terminate = TRUE;
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break;
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}
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case GST_MESSAGE_EOS:
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g_print("End-of-stream reached.\n");
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terminate = TRUE;
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break;
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case GST_MESSAGE_STATE_CHANGED:
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if (GST_MESSAGE_SRC(msg) == GST_OBJECT(data.pipeline)) {
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GstState old_state, new_state, pending_state;
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gst_message_parse_state_changed(msg, &old_state, &new_state, &pending_state);
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g_print("Changed from state %d to state %d\n", old_state, new_state);
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}
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break;
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default:
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break;
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}
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}while (!terminate);
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gst_object_unref(bus);
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gst_element_set_state(data.pipeline, GST_STATE_NULL);
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gst_object_unref(data.pipeline);
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return 0;
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}
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