采集

http://blog.chinaunix.net/uid-26000296-id-5118029.html

 

https://www.it610.com/article/1277721271932567552.htm

 

 

#include <gst/gst.h>

#define VIDEO_WIDTH 384

#define VIDEO_HEIGHT 288

#define VIDEO_FORMAT "RGB16"

#define PIXEL_SIZE 2

static void cb_need_data (GstElement *appsrc, guint unused_size, gpointer user_data)

{

static gboolean white = FALSE;

static GstClockTime timestamp = 0;

GstBuffer *buffer;

guint size;

GstFlowReturn ret;

size = VIDEO_WIDTH * VIDEO_HEIGHT * PIXEL_SIZE;

buffer = gst_buffer_new_allocate (NULL, size, NULL);

/* this makes the image black/white */

gst_buffer_memset (buffer, 0, white ? 0xFF : 0x00, size);

white = !white;

GST_BUFFER_PTS (buffer) = timestamp;

GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale_int (1, GST_SECOND, 2);

timestamp += GST_BUFFER_DURATION (buffer);

g_signal_emit_by_name (appsrc, "push-buffer", buffer, &ret);

gst_buffer_unref (buffer);

if (ret != GST_FLOW_OK)

{

/* something wrong, stop pushing */

//g_main_loop_quit (loop);

}

}

gint main (gint argc, gchar *argv[])

{

GstElement *pipeline, *appsrc, *conv, *videosink;

GMainLoop *loop;

/* init GStreamer */

gst_init (NULL, NULL);

loop = g_main_loop_new (NULL, FALSE);

/* setup pipeline */

pipeline = gst_pipeline_new ("pipeline");

appsrc = gst_element_factory_make ("appsrc", "source");

conv = gst_element_factory_make ("videoconvert", "conv");

videosink = gst_element_factory_make ("xvimagesink", "videosink");

/* setup */

g_object_set (G_OBJECT (appsrc), "caps",

gst_caps_new_simple ("video/x-raw",

"format", G_TYPE_STRING, VIDEO_FORMAT,

"width", G_TYPE_INT, VIDEO_WIDTH,

"height", G_TYPE_INT, VIDEO_HEIGHT,

"framerate", GST_TYPE_FRACTION, 0, 1,

NULL), NULL);

gst_bin_add_many (GST_BIN (pipeline), appsrc, conv, videosink, NULL);

gst_element_link_many (appsrc, conv, videosink, NULL);

/* setup appsrc */

g_object_set (G_OBJECT (appsrc),

"stream-type", 0,

"format", GST_FORMAT_TIME, NULL);

g_signal_connect (appsrc, "need-data", G_CALLBACK (cb_need_data), NULL);

/* play */

gst_element_set_state (pipeline, GST_STATE_PLAYING);

g_main_loop_run (loop);

/* clean up */

gst_element_set_state (pipeline, GST_STATE_NULL);

gst_object_unref (GST_OBJECT (pipeline));

g_main_loop_unref (loop);

return 0;

}