system/fidl/zircon-camera/camera_sensor.fidl

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library zircon.camera;

using zx;

// This structure represents image resolution.
struct ImageResolution {
    uint32 width;
    uint32 height;
};

// A sensor can support several different predefined modes.
struct SensorMode {
    // Frames per milliseconds. NOTE: (Reference code has fps * 256)
    uint32 fpms;
    // Resolution of the mode.
    ImageResolution resolution;
    // How many exposures this mode supports.
    uint8 exposures;
    // The wdr mode.
    uint8 wdr_mode;
    // Bit depth of data from sensor.
    uint8 bits;
    // Lane count.
    uint8 lanes;
    // MBps per lane.
    uint32 mbps;
    // The setting idx in seq.
    uint8 idx;
    // The setting bayer pattern
    uint8 bayer;
};

struct SensorInfo {
    // Total resolution of the image with blanking.
    ImageResolution total;
    // Active resolution without blanking.
    ImageResolution active;
    // Actual pixels per line after scaling/binning.
    uint32 pixels_per_line;
    // Maximum analog gain value in log2 format.
    int32 again_log2_max;
    // Maximum digital gain value in log2 format.
    int32 dgain_log2_max;
    // Precision of the gain - If required gain step
    // is less then this do not try to allocate it.
    int32 again_accuracy;
    // Minimum integration time for the sensor in lines.
    uint32 integration_time_min;
    // Maximum integration time for the sensor in lines
    // without dropping fps.
    uint32 integration_time_max;
    // Maximum integration time for long in lines.
    uint32 integration_time_long_max;
    // Maximum possible integration time for the sensor in lines.
    uint32 integration_time_limit;
    // Limit of integration time for non-flickering light source.
    uint16 day_light_integration_time_max;
    // Delay to apply integration time in frames.
    uint8 integration_time_apply_delay;
    // Select which WDR exposure channel gain
    // is delayed 0-none, 1-long, 2-medium, 3-short
    //  (only 0 and 1 implemented)
    uint8 isp_exposure_channel_delay;
    // Used for image stabilization.
    int32 xoffset;
    // Used for image stabilization.
    int32 yoffset;
    // Number of lines per second used for antiflicker.
    uint32 lines_per_second;
    // Number of different exposures supported by the sensor.
    int32 sensor_exp_number;
    // Current mode. This value is from the range [ 0 : countof(supported_modes) - 1 ].
    uint8 mode;
    // sensor setting bayer pattern.
    uint8 bayer;
};


[Layout = "Simple"]
interface CameraSensor {
  // Initializes the Camera Sensor.
  1: Init() -> (zx.status s);

  // De-Initializes the Camera Sensor.
  2: DeInit();

  // Sets the Camera Sensor Mode to one of the supported modes.
  3: SetMode(uint8 mode) -> (zx.status s);

  // Stop sensor data output.
  // This function is called from system to enable video stream from sensor.
  4: StartStreaming();

  // Stop sensor data output.
  // This function is called from system to disable video stream from sensor.
  5: StopStreaming();

  // Set analog gain.
  // This function sets the sensor digital gain.
  // Gain should be just saved here for the future.
  // The real sensor digital gain update must be implemented in
  // Update() routine.
  // @param gain - analog gain value in log2 format precision is defined by LOG2_GAIN_SHIFT
  // @return the real digital gain which will be applied
  6: SetAnalogGain(int32 gain) -> (int32 actual_gain);

  // Set digital gain.
  // This function sets the sensor digital gain.
  // Gain should be just saved here for the future.
  // The real sensor digital gain update must be implemented in
  // Update() routine.
  // @param gain - analog gain value in log2 format precision is defined by LOG2_GAIN_SHIFT
  // @return the real digital gain which will be applied
  7: SetDigitalGain(int32 gain) -> (int32 actual_gain);

  // Set integration time
  // This function sets the sensor integration time.
  // Integration time should be just saved here for the future.
  // The real time update must be implemented in
  // sensor_update routine.
  // @param int_time - integration time if one exposure is used or short exposure for multi-expsoure sensors.
  //        int_time_M - medium integration time if several exposures are supported.
  //        int_time_L - long integration time if several exposures are supported.
  8: SetIntegrationTime(int32 int_time, int32 int_time_M, int32 int_time_L);

  // Update all sensor parameters
  // The function is called from IRQ thread in vertical blanking.
  // All sensor parameters must be updated here.
  9: Update();

  // Get supported sensor modes.
  // 10: GetSupportedModes() -> (vector<SensorMode> supported_modes, uint32 num);

  // Gets the Sensor Parameters.
  // Note: This is not supported in Zircon yet under "Simple" layout.
  // 11: GetInfo() -> (zx.status s, SensorInfo info);
};