mem.c

#include <gst/gst.h>
#include <string.h>

int main(int argc, char *argv[])
{
	GstBuffer *buf;
	GstMemory *mem;
	GstMapInfo info;
	gsize size;
	gsize maxsize;

	gst_init(&argc, &argv);

	buf = gst_buffer_new();
	size = gst_buffer_get_sizes(buf, NULL, &maxsize);
	g_print("buf:\n");
	g_print(" size: %" G_GSIZE_FORMAT "\n", size);
	g_print(" maxsize: %" G_GSIZE_FORMAT "\n", maxsize);
	g_print(" nr: %u\n", gst_buffer_n_memory(buf));

	mem = gst_allocator_alloc(NULL, 3, NULL);
	size = gst_memory_get_sizes(mem, NULL, &maxsize);
	g_print("mem 1:\n");
	g_print(" size: %" G_GSIZE_FORMAT "\n", size);
	g_print(" maxsize: %" G_GSIZE_FORMAT "\n", maxsize);
	gst_memory_map(mem, &info, GST_MAP_WRITE);
	memcpy(info.data, "abc", 3);
	gst_memory_unmap(mem, &info);

	gst_buffer_insert_memory(buf, -1, mem);
	size = gst_buffer_get_sizes(buf, NULL, &maxsize);
	g_print("buf:\n");
	g_print(" size: %" G_GSIZE_FORMAT "\n", size);
	g_print(" maxsize: %" G_GSIZE_FORMAT "\n", maxsize);
	g_print(" nr: %u\n", gst_buffer_n_memory(buf));

	mem = gst_allocator_alloc(NULL, 6, NULL);
	size = gst_memory_get_sizes(mem, NULL, &maxsize);
	g_print("mem 2:\n");
	g_print(" size: %" G_GSIZE_FORMAT "\n", size);
	g_print(" maxsize: %" G_GSIZE_FORMAT "\n", maxsize);
	gst_memory_map(mem, &info, GST_MAP_WRITE);
	memcpy(info.data, "12345", 6);
	gst_memory_unmap(mem, &info);

	gst_buffer_insert_memory(buf, -1, mem);
	size = gst_buffer_get_sizes(buf, NULL, &maxsize);
	g_print("buf:\n");
	g_print(" size: %" G_GSIZE_FORMAT "\n", size);
	g_print(" maxsize: %" G_GSIZE_FORMAT "\n", maxsize);
	g_print(" nr: %u\n", gst_buffer_n_memory(buf));

	gst_buffer_map(buf, &info, GST_MAP_READ);
	g_print("%s\n", info.data);
	gst_buffer_unmap(buf, &info);

	return 0;
}