The libcamera starts

device/libcamera/buffer.cc

@@ -3,7 +3,44 @@
 int libcamera_buffer_open(buffer_t *buf)
 {
   buf->libcamera = new buffer_libcamera_t{};
+  buf->libcamera->request = buf->buf_list->dev->libcamera->camera->createRequest();
+  if (!buf->libcamera->request) {
+    E_LOG_ERROR(buf, "Can't create request");
+  }
+
+  for (libcamera::StreamConfiguration &stream_cfg : *buf->buf_list->libcamera->configuration) {
+    auto stream = stream_cfg.stream();
+    const std::vector<std::unique_ptr<libcamera::FrameBuffer>> &buffers =
+        buf->buf_list->libcamera->allocator->buffers(stream);
+    auto const &buffer = buffers[buf->index];
+
+    if (buf->libcamera->request->addBuffer(stream, buffer.get()) < 0) {
+      E_LOG_ERROR(buf, "Can't set buffer for request");
+    }
+
+    for (auto const &plane : buffer->planes()) {
+      if (buf->start) {
+        E_LOG_ERROR(buf, "Too many planes open.");
+      }
+
+      buf->start = mmap(NULL, plane.length, PROT_READ | PROT_WRITE, MAP_SHARED, plane.fd.get(), 0);
+      buf->length = plane.length;
+      buf->used = 0;
+      buf->dma_fd = plane.fd.get();
+
+      if (!buf->start) {
+        E_LOG_ERROR(buf, "Failed to mmap DMA buffer");
+      }
+
+      E_LOG_DEBUG(buf, "Mapped buffer: start=%p, length=%d, fd=%d",
+        buf->start, buf->length, buf->dma_fd);
+    }
+  }
+
   return 0;
+
+error:
+  return -1;
 }
 
 void libcamera_buffer_close(buffer_t *buf)