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// 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.
// This file is being deprecated - please do not rely on any of the structs or
// protocols here moving forward.
using fuchsia.sysmem;
using zx;
const uint32 MAX_FORMATS_PER_RESPONSE = 16;
/// A coarse set of capabilities. This struct is used in the camera description
/// to help filter out cameras which will not have the needed capabilities.
/// This set of declarations would be the bitfield: CameraOutputCapabilities.
const uint32 CAMERA_OUTPUT_UNKNOWN = 0;
const uint32 CAMERA_OUTPUT_STILL_IMAGE = 0x01;
const uint32 CAMERA_OUTPUT_BURST = 0x02;
const uint32 CAMERA_OUTPUT_STREAM = 0x04;
const uint32 CAMERA_OUTPUT_HDR = 0x08;
const uint32 CAMERA_OUTPUT_DEPTH = 0x10;
const uint32 CAMERA_OUTPUT_STEREO = 0x20;
/// Identifying information about the device.
struct DeviceInfo {
uint64 camera_id; // Currently populated by the camera manager
uint16 vendor_id;
string vendor_name;
uint16 product_id;
string product_name;
/// The maximum number of stream interfaces that the device can support
/// simultaneously.
uint16 max_stream_count;
uint32 output_capabilities; // CameraOutputCapabilities
// TODO(CAM-12): Add CameraPose, when we can actually use it.
/// Status to be set when a frame is signalled available.
enum FrameStatus {
OK = 0;
/// An error occurred during the production of a frame.
/// No data will be available in the data buffer corresponding to this
/// notification.
/// No space was available in the data buffer, resulting in a dropped frame.
struct Metadata {
int64 timestamp;
/// Sent by the driver to the client when a frame is available for processing,
/// or an error occurred.
struct FrameAvailableEvent {
/// Non zero if an error occurred.
FrameStatus frame_status;
/// The index of the buffer in the buffer collection.
uint32 buffer_id;
Metadata metadata;
struct FrameRate {
/// The frame rate is frames_per_sec_numerator / frames_per_sec_denominator.
uint32 frames_per_sec_numerator;
uint32 frames_per_sec_denominator;
struct VideoFormat {
fuchsia.sysmem.ImageFormat format;
FrameRate rate;
/// These are the original interfaces, which are being used for compatibility.
/// The names are preserved from the ones in camera.h for porting ease.
protocol Control {
/// Get the available format types for this device
/// NOTE: The formats are paginated to `MAX_FORMATS_PER_RESPONSE`, multiple
/// GetFormats need to be issued until total_format_count are received
GetFormats(uint32 index)
-> (vector<VideoFormat> formats, uint32 total_format_count,
zx.status status);
/// Sent by the client to indicate desired stream characteristics.
/// If setting the format is successful, the stream request will be honored.
/// The stream token is used to provide additional control over the interface from the
/// Camera Manager. The driver provides the guarantee that:
/// 1) If the stream token receives the `PEER_CLOSED` event, the driver will close
/// the stream.
/// 2) If the Stream interface is closed, the driver will close the eventpair.
CreateStream(fuchsia.sysmem.BufferCollectionInfo buffer_collection,
FrameRate rate, request<Stream> stream, handle<eventpair> stream_token);
GetDeviceInfo() -> (DeviceInfo device_info);
protocol Stream {
/// Starts the streaming of frames.
/// Stops the streaming of frames.
/// Unlocks the specified frame, allowing the driver to reuse the memory.
ReleaseFrame(uint32 buffer_id);
/// Sent by the driver to the client when a frame is available for processing,
/// or an error occurred.
-> OnFrameAvailable(FrameAvailableEvent frame);