Add channels & control query

src/internal/channels.cc

@@ -0,0 +1,44 @@
+#include "internal/channels.h"
+
+#include <glog/logging.h>
+
+#include "uvc/uvc.h"
+
+MYNTEYE_BEGIN_NAMESPACE
+
+Channels::Channels(std::shared_ptr<uvc::device> device) : device_(device) {
+  VLOG(2) << __func__;
+}
+
+Channels::~Channels() {
+  VLOG(2) << __func__;
+}
+
+bool Channels::ControlQuery(
+    const uvc::xu &xu, uint8_t selector, const query_t &query, uint16_t size,
+    uint8_t *data) {
+  CHECK_NOTNULL(device_);
+  uvc::xu_query code;
+  switch (query) {
+    case SET_CUR:
+      code = uvc::XU_SET_CUR;
+      break;
+    case GET_CUR:
+      code = uvc::XU_GET_CUR;
+      break;
+    case GET_MIN:
+      code = uvc::XU_GET_MIN;
+      break;
+    case GET_MAX:
+      code = uvc::XU_GET_MAX;
+      break;
+    case GET_DEF:
+      code = uvc::XU_GET_DEF;
+      break;
+    default:
+      LOG(FATAL) << "ControlQuery query code is unaccepted";
+  }
+  return uvc::xu_control_query(*device_, xu, selector, code, size, data);
+}
+
+MYNTEYE_END_NAMESPACE

src/internal/channels.h

@@ -0,0 +1,42 @@
+#ifndef MYNTEYE_INTERNAL_CHANNELS_H_  // NOLINT
+#define MYNTEYE_INTERNAL_CHANNELS_H_
+#pragma once
+
+#include <memory>
+
+#include "mynteye/mynteye.h"
+
+MYNTEYE_BEGIN_NAMESPACE
+
+namespace uvc {
+
+struct device;
+struct xu;
+
+}  // namespace uvc
+
+class Channels {
+ public:
+  typedef enum Query {
+    SET_CUR,
+    GET_CUR,
+    GET_MIN,
+    GET_MAX,
+    GET_DEF,
+    LAST
+  } query_t;
+
+  explicit Channels(std::shared_ptr<uvc::device> device);
+  ~Channels();
+
+ private:
+  bool ControlQuery(
+      const uvc::xu &xu, uint8_t selector, const query_t &query, uint16_t size,
+      uint8_t *data);
+
+  std::shared_ptr<uvc::device> device_;
+};
+
+MYNTEYE_END_NAMESPACE
+
+#endif  // MYNTEYE_INTERNAL_CHANNELS_H_ NOLINT