Appending GstBuffers

gistfile1.c

/*  -*- compile-command: "gcc -Wall -Wextra -g $(pkg-config --cflags --libs gstreamer-1.0) a.c" -*- */
#include <gst/gst.h>

void dump_buf(GstBuffer *buf)
{
	gsize max;
	gsize bufsize;
	gsize offset;

	bufsize = gst_buffer_get_sizes(buf, &offset, &max);

	g_message("%p", buf);
	g_message("  size: %" G_GSIZE_FORMAT, bufsize);
	g_message("  max: %" G_GSIZE_FORMAT, max);
	g_message("  offset : %" G_GSIZE_FORMAT, offset);
	g_message("  ref: %d", GST_MINI_OBJECT_REFCOUNT_VALUE(buf));
}
int main(int argc, char *argv[])
{
	GstBuffer *buf1;
	GstBuffer *buf2;
	GstBuffer *buf3;
	char *s;

	gst_init(&argc, &argv);
	buf1 = gst_buffer_new_allocate(NULL, 10, NULL);
	gst_buffer_fill(buf1, 0, "0123456789", 10);
	dump_buf(buf1);

	buf2 = gst_buffer_new_allocate(NULL, 6, NULL);
	gst_buffer_fill(buf2, 0, "abcdef", 6);
	dump_buf(buf2);

	/*
	 * all bufs (buf1, buf2 and buf3) are "transfer full", meaning
	 * that: a. both argument is not accessible after the call
	 * (might be freed by the function), b. the memory region for
	 * the buf3 is caller's responsibility.  The function might
	 * return the address of buf2, but that's just a coincidence
	 * from API's point of view.
	 */
	buf3 = gst_buffer_append(buf2, buf1);
	dump_buf(buf3);

	s = g_new0(char, 17);
	gst_buffer_extract(buf2, 0, s, 17);
	g_message("%s", s);

	return 0;
}