diff --git a/include/buffer.h b/include/buffer.h
index 359ace7..db88778 100644
--- a/include/buffer.h
+++ b/include/buffer.h
@@ -8,7 +8,13 @@
 
 struct wl_buffer;
 
+enum wv_buffer_type {
+	WV_BUFFER_UNSPEC = 0,
+	WV_BUFFER_SHM,
+};
+
 struct wv_buffer {
+	enum wv_buffer_type type;
 	TAILQ_ENTRY(wv_buffer) link;
 	struct wl_buffer* wl_buffer;
 	void* pixels;
@@ -22,18 +28,22 @@ TAILQ_HEAD(wv_buffer_queue, wv_buffer);
 
 struct wv_buffer_pool {
 	struct wv_buffer_queue queue;
+	enum wv_buffer_type type;
 	int width, height, stride;
 	uint32_t format;
 };
 
-struct wv_buffer* wv_buffer_create(int width, int height, int stride,
-		uint32_t fourcc);
+struct wv_buffer* wv_buffer_create(enum wv_buffer_type, int width, int height,
+		int stride, uint32_t fourcc);
 void wv_buffer_destroy(struct wv_buffer* self);
 
-struct wv_buffer_pool* wv_buffer_pool_create(int width, int height, int stride,
-		uint32_t format);
+int wv_buffer_map(struct wv_buffer* self);
+void wv_buffer_unmap(struct wv_buffer* self);
+
+struct wv_buffer_pool* wv_buffer_pool_create(enum wv_buffer_type, int width,
+		int height, int stride, uint32_t format);
 void wv_buffer_pool_destroy(struct wv_buffer_pool* pool);
-void wv_buffer_pool_resize(struct wv_buffer_pool* pool,
+void wv_buffer_pool_resize(struct wv_buffer_pool* pool, enum wv_buffer_type,
 		int width, int height, int stride, uint32_t format);
 struct wv_buffer* wv_buffer_pool_acquire(struct wv_buffer_pool* pool);
 void wv_buffer_pool_release(struct wv_buffer_pool* pool,
diff --git a/src/buffer.c b/src/buffer.c
index 74ca6ff..46ac4ea 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -14,8 +14,8 @@
 
 extern struct wl_shm* wl_shm;
 
-struct wv_buffer* wv_buffer_create(int width, int height, int stride,
-		uint32_t fourcc)
+struct wv_buffer* wv_buffer_create(enum wv_buffer_type type, int width,
+		int height, int stride, uint32_t fourcc)
 {
 	assert(wl_shm);
 	enum wl_shm_format wl_fmt = fourcc_to_wl_shm(fourcc);
@@ -24,6 +24,7 @@ struct wv_buffer* wv_buffer_create(int width, int height, int stride,
 	if (!self)
 		return NULL;
 
+	self->type = type;
 	self->width = width;
 	self->height = height;
 	self->stride = stride;
@@ -69,14 +70,15 @@ void wv_buffer_destroy(struct wv_buffer* self)
 	free(self);
 }
 
-struct wv_buffer_pool* wv_buffer_pool_create(int width, int height, int stride,
-		uint32_t format)
+struct wv_buffer_pool* wv_buffer_pool_create(enum wv_buffer_type type,
+		int width, int height, int stride, uint32_t format)
 {
 	struct wv_buffer_pool* self = calloc(1, sizeof(*self));
 	if (!self)
 		return NULL;
 
 	TAILQ_INIT(&self->queue);
+	self->type = type;
 	self->width = width;
 	self->height = height;
 	self->stride = stride;
@@ -101,13 +103,15 @@ void wv_buffer_pool_destroy(struct wv_buffer_pool* pool)
 }
 
 void wv_buffer_pool_resize(struct wv_buffer_pool* pool,
-		int width, int height, int stride, uint32_t format)
+		enum wv_buffer_type type, int width, int height, int stride,
+		uint32_t format)
 {
-	if (pool->width != width || pool->height != height
+	if (pool->type != type || pool->width != width || pool->height != height
 	    || pool->stride != stride || pool->format != format) {
 		wv_buffer_pool_clear(pool);
 	}
 
+	pool->type = type;
 	pool->width = width;
 	pool->height = height;
 	pool->stride = stride;
@@ -118,7 +122,8 @@ struct wv_buffer* wv_buffer_pool_acquire(struct wv_buffer_pool* pool)
 {
 	struct wv_buffer* buffer = TAILQ_FIRST(&pool->queue);
 	if (buffer) {
-		assert(pool->width == buffer->width
+		assert(pool->type == buffer->type
+		       && pool->width == buffer->width
 		       && pool->height == buffer->height
 		       && pool->stride == buffer->stride
 		       && pool->format == buffer->format);
@@ -127,8 +132,8 @@ struct wv_buffer* wv_buffer_pool_acquire(struct wv_buffer_pool* pool)
 		return buffer;
 	}
 
-	return wv_buffer_create(pool->width, pool->height, pool->stride,
-			pool->format);
+	return wv_buffer_create(pool->type, pool->width, pool->height,
+			pool->stride, pool->format);
 }
 
 void wv_buffer_pool_release(struct wv_buffer_pool* pool,
diff --git a/src/screencopy.c b/src/screencopy.c
index 9b2c82f..9882c32 100644
--- a/src/screencopy.c
+++ b/src/screencopy.c
@@ -68,7 +68,8 @@ static void screencopy_buffer(void* data,
 	struct screencopy* self = data;
 
 	uint32_t fourcc = fourcc_from_wl_shm(format);
-	wv_buffer_pool_resize(self->pool, width, height, stride, fourcc);
+	wv_buffer_pool_resize(self->pool, WV_BUFFER_SHM, width, height, stride,
+			fourcc);
 
 	struct wv_buffer* buffer = wv_buffer_pool_acquire(self->pool);
 	if (!buffer) {
@@ -244,7 +245,7 @@ static void screencopy_render(struct frame_capture* fc,
 
 void screencopy_init(struct screencopy* self)
 {
-	self->pool = wv_buffer_pool_create(0, 0, 0, 0);
+	self->pool = wv_buffer_pool_create(0, 0, 0, 0, 0);
 	assert(self->pool);
 
 	self->timer = aml_timer_new(0, screencopy__poll, self, NULL);