blakeblackshear.frigate/frigate/api/media.py

"""Image and video apis."""

import base64
import glob
import logging
import os
import subprocess as sp
import time
from datetime import datetime, timedelta, timezone
from pathlib import Path as FilePath
from urllib.parse import unquote

import cv2
import numpy as np
import pytz
from fastapi import APIRouter, Path, Query, Request, Response
from fastapi.params import Depends
from fastapi.responses import FileResponse, JSONResponse, StreamingResponse
from pathvalidate import sanitize_filename
from peewee import DoesNotExist, fn
from tzlocal import get_localzone_name

from frigate.api.defs.media_query_parameters import (
    Extension,
    MediaEventsSnapshotQueryParams,
    MediaLatestFrameQueryParams,
    MediaMjpegFeedQueryParams,
)
from frigate.api.defs.tags import Tags
from frigate.config import FrigateConfig
from frigate.const import (
    CACHE_DIR,
    CLIPS_DIR,
    MAX_SEGMENT_DURATION,
    PREVIEW_FRAME_TYPE,
    RECORD_DIR,
)
from frigate.models import Event, Previews, Recordings, Regions, ReviewSegment
from frigate.util.builtin import get_tz_modifiers
from frigate.util.image import get_image_from_recording

logger = logging.getLogger(__name__)


router = APIRouter(tags=[Tags.media])


@router.get("/{camera_name}")
def mjpeg_feed(
    request: Request,
    camera_name: str,
    params: MediaMjpegFeedQueryParams = Depends(),
):
    draw_options = {
        "bounding_boxes": params.bbox,
        "timestamp": params.timestamp,
        "zones": params.zones,
        "mask": params.mask,
        "motion_boxes": params.motion,
        "regions": params.regions,
    }
    if camera_name in request.app.frigate_config.cameras:
        # return a multipart response
        return StreamingResponse(
            imagestream(
                request.app.detected_frames_processor,
                camera_name,
                params.fps,
                params.height,
                draw_options,
            ),
            media_type="multipart/x-mixed-replace;boundary=frame",
        )
    else:
        return JSONResponse(
            content={"success": False, "message": "Camera not found"},
            status_code=404,
        )


def imagestream(
    detected_frames_processor, camera_name: str, fps: int, height: int, draw_options
):
    while True:
        # max out at specified FPS
        time.sleep(1 / fps)
        frame = detected_frames_processor.get_current_frame(camera_name, draw_options)
        if frame is None:
            frame = np.zeros((height, int(height * 16 / 9), 3), np.uint8)

        width = int(height * frame.shape[1] / frame.shape[0])
        frame = cv2.resize(frame, dsize=(width, height), interpolation=cv2.INTER_LINEAR)

        ret, jpg = cv2.imencode(".jpg", frame, [int(cv2.IMWRITE_JPEG_QUALITY), 70])
        yield (
            b"--frame\r\n"
            b"Content-Type: image/jpeg\r\n\r\n" + bytearray(jpg.tobytes()) + b"\r\n\r\n"
        )


@router.get("/{camera_name}/ptz/info")
def camera_ptz_info(request: Request, camera_name: str):
    if camera_name in request.app.frigate_config.cameras:
        return JSONResponse(
            content=request.app.onvif.get_camera_info(camera_name),
        )
    else:
        return JSONResponse(
            content={"success": False, "message": "Camera not found"},
            status_code=404,
        )


@router.get("/{camera_name}/latest.{extension}")
def latest_frame(
    request: Request,
    camera_name: str,
    extension: Extension,
    params: MediaLatestFrameQueryParams = Depends(),
):
    draw_options = {
        "bounding_boxes": params.bbox,
        "timestamp": params.timestamp,
        "zones": params.zones,
        "mask": params.mask,
        "motion_boxes": params.motion,
        "regions": params.regions,
    }
    quality = params.quality

    if camera_name in request.app.frigate_config.cameras:
        frame = request.app.detected_frames_processor.get_current_frame(
            camera_name, draw_options
        )
        retry_interval = float(
            request.app.frigate_config.cameras.get(camera_name).ffmpeg.retry_interval
            or 10
        )

        if frame is None or datetime.now().timestamp() > (
            request.app.detected_frames_processor.get_current_frame_time(camera_name)
            + retry_interval
        ):
            if request.app.camera_error_image is None:
                error_image = glob.glob("/opt/frigate/frigate/images/camera-error.jpg")

                if len(error_image) > 0:
                    request.app.camera_error_image = cv2.imread(
                        error_image[0], cv2.IMREAD_UNCHANGED
                    )

            frame = request.app.camera_error_image

        height = int(params.height or str(frame.shape[0]))
        width = int(height * frame.shape[1] / frame.shape[0])

        if frame is None:
            return JSONResponse(
                content={"success": False, "message": "Unable to get valid frame"},
                status_code=500,
            )

        if height < 1 or width < 1:
            return JSONResponse(
                content="Invalid height / width requested :: {} / {}".format(
                    height, width
                ),
                status_code=400,
            )

        frame = cv2.resize(frame, dsize=(width, height), interpolation=cv2.INTER_AREA)

        ret, img = cv2.imencode(
            f".{extension}", frame, [int(cv2.IMWRITE_WEBP_QUALITY), quality]
        )
        return Response(
            content=img.tobytes(),
            media_type=f"image/{extension}",
            headers={"Content-Type": f"image/{extension}", "Cache-Control": "no-store"},
        )
    elif camera_name == "birdseye" and request.app.frigate_config.birdseye.restream:
        frame = cv2.cvtColor(
            request.app.detected_frames_processor.get_current_frame(camera_name),
            cv2.COLOR_YUV2BGR_I420,
        )

        height = int(params.height or str(frame.shape[0]))
        width = int(height * frame.shape[1] / frame.shape[0])

        frame = cv2.resize(frame, dsize=(width, height), interpolation=cv2.INTER_AREA)

        ret, img = cv2.imencode(
            f".{extension}", frame, [int(cv2.IMWRITE_WEBP_QUALITY), quality]
        )
        return Response(
            content=img.tobytes(),
            media_type=f"image/{extension}",
            headers={"Content-Type": f"image/{extension}", "Cache-Control": "no-store"},
        )
    else:
        return JSONResponse(
            content={"success": False, "message": "Camera not found"},
            status_code=404,
        )


@router.get("/{camera_name}/recordings/{frame_time}/snapshot.{format}")
def get_snapshot_from_recording(
    request: Request,
    camera_name: str,
    frame_time: float,
    format: str = Path(enum=["png", "jpg"]),
    height: int = None,
):
    if camera_name not in request.app.frigate_config.cameras:
        return JSONResponse(
            content={"success": False, "message": "Camera not found"},
            status_code=404,
        )

    recording_query = (
        Recordings.select(
            Recordings.path,
            Recordings.start_time,
        )
        .where(
            (
                (frame_time >= Recordings.start_time)
                & (frame_time <= Recordings.end_time)
            )
        )
        .where(Recordings.camera == camera_name)
        .order_by(Recordings.start_time.desc())
        .limit(1)
    )

    try:
        recording: Recordings = recording_query.get()
        time_in_segment = frame_time - recording.start_time
        codec = "png" if format == "png" else "mjpeg"
        config: FrigateConfig = request.app.frigate_config

        image_data = get_image_from_recording(
            config.ffmpeg, recording.path, time_in_segment, codec, height
        )

        if not image_data:
            return JSONResponse(
                content=(
                    {
                        "success": False,
                        "message": f"Unable to parse frame at time {frame_time}",
                    }
                ),
                status_code=404,
            )
        return Response(image_data, headers={"Content-Type": f"image/{format}"})
    except DoesNotExist:
        return JSONResponse(
            content={
                "success": False,
                "message": "Recording not found at {}".format(frame_time),
            },
            status_code=404,
        )


@router.post("/{camera_name}/plus/{frame_time}")
def submit_recording_snapshot_to_plus(
    request: Request, camera_name: str, frame_time: str
):
    if camera_name not in request.app.frigate_config.cameras:
        return JSONResponse(
            content={"success": False, "message": "Camera not found"},
            status_code=404,
        )

    frame_time = float(frame_time)
    recording_query = (
        Recordings.select(
            Recordings.path,
            Recordings.start_time,
        )
        .where(
            (
                (frame_time >= Recordings.start_time)
                & (frame_time <= Recordings.end_time)
            )
        )
        .where(Recordings.camera == camera_name)
        .order_by(Recordings.start_time.desc())
        .limit(1)
    )

    try:
        config: FrigateConfig = request.app.frigate_config
        recording: Recordings = recording_query.get()
        time_in_segment = frame_time - recording.start_time
        image_data = get_image_from_recording(
            config.ffmpeg, recording.path, time_in_segment, "png"
        )

        if not image_data:
            return JSONResponse(
                content={
                    "success": False,
                    "message": f"Unable to parse frame at time {frame_time}",
                },
                status_code=404,
            )

        nd = cv2.imdecode(np.frombuffer(image_data, dtype=np.int8), cv2.IMREAD_COLOR)
        request.app.frigate_config.plus_api.upload_image(nd, camera_name)

        return JSONResponse(
            content={
                "success": True,
                "message": "Successfully submitted image.",
            },
            status_code=200,
        )
    except DoesNotExist:
        return JSONResponse(
            content={
                "success": False,
                "message": "Recording not found at {}".format(frame_time),
            },
            status_code=404,
        )


@router.get("/recordings/storage")
def get_recordings_storage_usage(request: Request):
    recording_stats = request.app.stats_emitter.get_latest_stats()["service"][
        "storage"
    ][RECORD_DIR]

    if not recording_stats:
        return JSONResponse({})

    total_mb = recording_stats["total"]

    camera_usages: dict[str, dict] = (
        request.app.storage_maintainer.calculate_camera_usages()
    )

    for camera_name in camera_usages.keys():
        if camera_usages.get(camera_name, {}).get("usage"):
            camera_usages[camera_name]["usage_percent"] = (
                camera_usages.get(camera_name, {}).get("usage", 0) / total_mb
            ) * 100

    return JSONResponse(content=camera_usages)


@router.get("/{camera_name}/recordings/summary")
def recordings_summary(camera_name: str, timezone: str = "utc"):
    """Returns hourly summary for recordings of given camera"""
    hour_modifier, minute_modifier, seconds_offset = get_tz_modifiers(timezone)
    recording_groups = (
        Recordings.select(
            fn.strftime(
                "%Y-%m-%d %H",
                fn.datetime(
                    Recordings.start_time, "unixepoch", hour_modifier, minute_modifier
                ),
            ).alias("hour"),
            fn.SUM(Recordings.duration).alias("duration"),
            fn.SUM(Recordings.motion).alias("motion"),
            fn.SUM(Recordings.objects).alias("objects"),
        )
        .where(Recordings.camera == camera_name)
        .group_by((Recordings.start_time + seconds_offset).cast("int") / 3600)
        .order_by(Recordings.start_time.desc())
        .namedtuples()
    )

    event_groups = (
        Event.select(
            fn.strftime(
                "%Y-%m-%d %H",
                fn.datetime(
                    Event.start_time, "unixepoch", hour_modifier, minute_modifier
                ),
            ).alias("hour"),
            fn.COUNT(Event.id).alias("count"),
        )
        .where(Event.camera == camera_name, Event.has_clip)
        .group_by((Event.start_time + seconds_offset).cast("int") / 3600)
        .namedtuples()
    )

    event_map = {g.hour: g.count for g in event_groups}

    days = {}

    for recording_group in recording_groups:
        parts = recording_group.hour.split()
        hour = parts[1]
        day = parts[0]
        events_count = event_map.get(recording_group.hour, 0)
        hour_data = {
            "hour": hour,
            "events": events_count,
            "motion": recording_group.motion,
            "objects": recording_group.objects,
            "duration": round(recording_group.duration),
        }
        if day not in days:
            days[day] = {"events": events_count, "hours": [hour_data], "day": day}
        else:
            days[day]["events"] += events_count
            days[day]["hours"].append(hour_data)

    return JSONResponse(content=list(days.values()))


@router.get("/{camera_name}/recordings")
def recordings(
    camera_name: str,
    after: float = (datetime.now() - timedelta(hours=1)).timestamp(),
    before: float = datetime.now().timestamp(),
):
    """Return specific camera recordings between the given 'after'/'end' times. If not provided the last hour will be used"""
    recordings = (
        Recordings.select(
            Recordings.id,
            Recordings.start_time,
            Recordings.end_time,
            Recordings.segment_size,
            Recordings.motion,
            Recordings.objects,
            Recordings.duration,
        )
        .where(
            Recordings.camera == camera_name,
            Recordings.end_time >= after,
            Recordings.start_time <= before,
        )
        .order_by(Recordings.start_time)
        .dicts()
        .iterator()
    )

    return JSONResponse(content=list(recordings))


@router.get("/{camera_name}/start/{start_ts}/end/{end_ts}/clip.mp4")
def recording_clip(
    request: Request,
    camera_name: str,
    start_ts: float,
    end_ts: float,
):
    def run_download(ffmpeg_cmd: list[str], file_path: str):
        with sp.Popen(
            ffmpeg_cmd,
            stderr=sp.PIPE,
            stdout=sp.PIPE,
            text=False,
        ) as ffmpeg:
            while True:
                data = ffmpeg.stdout.read(1024)
                if data is not None:
                    yield data
                else:
                    if ffmpeg.returncode and ffmpeg.returncode != 0:
                        logger.error(
                            f"Failed to generate clip, ffmpeg logs: {ffmpeg.stderr.read()}"
                        )
                    else:
                        FilePath(file_path).unlink(missing_ok=True)
                    break

    recordings = (
        Recordings.select(
            Recordings.path,
            Recordings.start_time,
            Recordings.end_time,
        )
        .where(
            (Recordings.start_time.between(start_ts, end_ts))
            | (Recordings.end_time.between(start_ts, end_ts))
            | ((start_ts > Recordings.start_time) & (end_ts < Recordings.end_time))
        )
        .where(Recordings.camera == camera_name)
        .order_by(Recordings.start_time.asc())
    )

    file_name = sanitize_filename(f"playlist_{camera_name}_{start_ts}-{end_ts}.txt")
    file_path = f"/tmp/cache/{file_name}"
    with open(file_path, "w") as file:
        clip: Recordings
        for clip in recordings:
            file.write(f"file '{clip.path}'\n")
            # if this is the starting clip, add an inpoint
            if clip.start_time < start_ts:
                file.write(f"inpoint {int(start_ts - clip.start_time)}\n")
            # if this is the ending clip, add an outpoint
            if clip.end_time > end_ts:
                file.write(f"outpoint {int(end_ts - clip.start_time)}\n")

    if len(file_name) > 1000:
        return JSONResponse(
            content={
                "success": False,
                "message": "Filename exceeded max length of 1000",
            },
            status_code=403,
        )

    config: FrigateConfig = request.app.frigate_config

    ffmpeg_cmd = [
        config.ffmpeg.ffmpeg_path,
        "-hide_banner",
        "-y",
        "-protocol_whitelist",
        "pipe,file",
        "-f",
        "concat",
        "-safe",
        "0",
        "-i",
        file_path,
        "-c",
        "copy",
        "-movflags",
        "frag_keyframe+empty_moov",
        "-f",
        "mp4",
        "pipe:",
    ]

    return StreamingResponse(
        run_download(ffmpeg_cmd, file_path),
        media_type="video/mp4",
    )


@router.get("/vod/{camera_name}/start/{start_ts}/end/{end_ts}")
def vod_ts(camera_name: str, start_ts: float, end_ts: float):
    recordings = (
        Recordings.select(Recordings.path, Recordings.duration, Recordings.end_time)
        .where(
            Recordings.start_time.between(start_ts, end_ts)
            | Recordings.end_time.between(start_ts, end_ts)
            | ((start_ts > Recordings.start_time) & (end_ts < Recordings.end_time))
        )
        .where(Recordings.camera == camera_name)
        .order_by(Recordings.start_time.asc())
        .iterator()
    )

    clips = []
    durations = []
    max_duration_ms = MAX_SEGMENT_DURATION * 1000

    recording: Recordings
    for recording in recordings:
        clip = {"type": "source", "path": recording.path}
        duration = int(recording.duration * 1000)

        # Determine if we need to end the last clip early
        if recording.end_time > end_ts:
            duration -= int((recording.end_time - end_ts) * 1000)

            if duration == 0:
                # this means the segment starts right at the end of the requested time range
                # and it does not need to be included
                continue

        if 0 < duration < max_duration_ms:
            clip["keyFrameDurations"] = [duration]
            clips.append(clip)
            durations.append(duration)
        else:
            logger.warning(f"Recording clip is missing or empty: {recording.path}")

    if not clips:
        logger.error(
            f"No recordings found for {camera_name} during the requested time range"
        )
        return JSONResponse(
            content={
                "success": False,
                "message": "No recordings found.",
            },
            status_code=404,
        )

    hour_ago = datetime.now() - timedelta(hours=1)
    return JSONResponse(
        content={
            "cache": hour_ago.timestamp() > start_ts,
            "discontinuity": False,
            "consistentSequenceMediaInfo": True,
            "durations": durations,
            "segment_duration": max(durations),
            "sequences": [{"clips": clips}],
        }
    )


@router.get("/vod/{year_month}/{day}/{hour}/{camera_name}")
def vod_hour_no_timezone(year_month: str, day: int, hour: int, camera_name: str):
    """VOD for specific hour. Uses the default timezone (UTC)."""
    return vod_hour(
        year_month, day, hour, camera_name, get_localzone_name().replace("/", ",")
    )


@router.get("/vod/{year_month}/{day}/{hour}/{camera_name}/{tz_name}")
def vod_hour(year_month: str, day: int, hour: int, camera_name: str, tz_name: str):
    parts = year_month.split("-")
    start_date = (
        datetime(int(parts[0]), int(parts[1]), day, hour, tzinfo=timezone.utc)
        - datetime.now(pytz.timezone(tz_name.replace(",", "/"))).utcoffset()
    )
    end_date = start_date + timedelta(hours=1) - timedelta(milliseconds=1)
    start_ts = start_date.timestamp()
    end_ts = end_date.timestamp()

    return vod_ts(camera_name, start_ts, end_ts)


@router.get("/vod/event/{event_id}")
def vod_event(event_id: str):
    try:
        event: Event = Event.get(Event.id == event_id)
    except DoesNotExist:
        logger.error(f"Event not found: {event_id}")
        return JSONResponse(
            content={
                "success": False,
                "message": "Event not found.",
            },
            status_code=404,
        )

    if not event.has_clip:
        logger.error(f"Event does not have recordings: {event_id}")
        return JSONResponse(
            content={
                "success": False,
                "message": "Recordings not available.",
            },
            status_code=404,
        )

    clip_path = os.path.join(CLIPS_DIR, f"{event.camera}-{event.id}.mp4")

    if not os.path.isfile(clip_path):
        end_ts = (
            datetime.now().timestamp() if event.end_time is None else event.end_time
        )
        vod_response = vod_ts(event.camera, event.start_time, end_ts)
        # If the recordings are not found and the event started more than 5 minutes ago, set has_clip to false
        if (
            event.start_time < datetime.now().timestamp() - 300
            and type(vod_response) is tuple
            and len(vod_response) == 2
            and vod_response[1] == 404
        ):
            Event.update(has_clip=False).where(Event.id == event_id).execute()
        return vod_response

    duration = int((event.end_time - event.start_time) * 1000)
    return JSONResponse(
        content={
            "cache": True,
            "discontinuity": False,
            "durations": [duration],
            "sequences": [{"clips": [{"type": "source", "path": clip_path}]}],
        }
    )


@router.get("/events/{event_id}/snapshot.jpg")
def event_snapshot(
    request: Request,
    event_id: str,
    params: MediaEventsSnapshotQueryParams = Depends(),
):
    event_complete = False
    jpg_bytes = None
    try:
        event = Event.get(Event.id == event_id, Event.end_time != None)
        event_complete = True
        if not event.has_snapshot:
            return JSONResponse(
                content={"success": False, "message": "Snapshot not available"},
                status_code=404,
            )
        # read snapshot from disk
        with open(
            os.path.join(CLIPS_DIR, f"{event.camera}-{event.id}.jpg"), "rb"
        ) as image_file:
            jpg_bytes = image_file.read()
    except DoesNotExist:
        # see if the object is currently being tracked
        try:
            camera_states = request.app.detected_frames_processor.camera_states.values()
            for camera_state in camera_states:
                if event_id in camera_state.tracked_objects:
                    tracked_obj = camera_state.tracked_objects.get(event_id)
                    if tracked_obj is not None:
                        jpg_bytes = tracked_obj.get_jpg_bytes(
                            timestamp=params.timestamp,
                            bounding_box=params.bbox,
                            crop=params.crop,
                            height=params.height,
                            quality=params.quality,
                        )
        except Exception:
            return JSONResponse(
                content={"success": False, "message": "Event not found"},
                status_code=404,
            )
    except Exception:
        return JSONResponse(
            content={"success": False, "message": "Event not found"}, status_code=404
        )

    if jpg_bytes is None:
        return JSONResponse(
            content={"success": False, "message": "Event not found"}, status_code=404
        )

    headers = {
        "Content-Type": "image/jpeg",
        "Cache-Control": "private, max-age=31536000" if event_complete else "no-store",
    }

    if params.download:
        headers["Content-Disposition"] = f"attachment; filename=snapshot-{event_id}.jpg"

    return Response(
        jpg_bytes,
        media_type="image/jpeg",
        headers=headers,
    )


@router.get("/events/{event_id}/thumbnail.jpg")
def event_thumbnail(
    request: Request,
    event_id: str,
    max_cache_age: int = Query(
        2592000, description="Max cache age in seconds. Default 30 days in seconds."
    ),
    format: str = Query(default="ios", enum=["ios", "android"]),
):
    thumbnail_bytes = None
    event_complete = False
    try:
        event = Event.get(Event.id == event_id)
        if event.end_time is not None:
            event_complete = True
        thumbnail_bytes = base64.b64decode(event.thumbnail)
    except DoesNotExist:
        # see if the object is currently being tracked
        try:
            camera_states = request.app.detected_frames_processor.camera_states.values()
            for camera_state in camera_states:
                if event_id in camera_state.tracked_objects:
                    tracked_obj = camera_state.tracked_objects.get(event_id)
                    if tracked_obj is not None:
                        thumbnail_bytes = tracked_obj.get_thumbnail()
        except Exception:
            return JSONResponse(
                content={"success": False, "message": "Event not found"},
                status_code=404,
            )

    if thumbnail_bytes is None:
        return JSONResponse(
            content={"success": False, "message": "Event not found"},
            status_code=404,
        )

    # android notifications prefer a 2:1 ratio
    if format == "android":
        jpg_as_np = np.frombuffer(thumbnail_bytes, dtype=np.uint8)
        img = cv2.imdecode(jpg_as_np, flags=1)
        thumbnail = cv2.copyMakeBorder(
            img,
            0,
            0,
            int(img.shape[1] * 0.5),
            int(img.shape[1] * 0.5),
            cv2.BORDER_CONSTANT,
            (0, 0, 0),
        )
        ret, jpg = cv2.imencode(".jpg", thumbnail, [int(cv2.IMWRITE_JPEG_QUALITY), 70])
        thumbnail_bytes = jpg.tobytes()

    return Response(
        thumbnail_bytes,
        media_type="image/jpeg",
        headers={
            "Cache-Control": f"private, max-age={max_cache_age}"
            if event_complete
            else "no-store",
            "Content-Type": "image/jpeg",
        },
    )


@router.get("/{camera_name}/grid.jpg")
def grid_snapshot(
    request: Request, camera_name: str, color: str = "green", font_scale: float = 0.5
):
    if camera_name in request.app.frigate_config.cameras:
        detect = request.app.frigate_config.cameras[camera_name].detect
        frame = request.app.detected_frames_processor.get_current_frame(camera_name, {})
        retry_interval = float(
            request.app.frigate_config.cameras.get(camera_name).ffmpeg.retry_interval
            or 10
        )

        if frame is None or datetime.now().timestamp() > (
            request.app.detected_frames_processor.get_current_frame_time(camera_name)
            + retry_interval
        ):
            return JSONResponse(
                content={"success": False, "message": "Unable to get valid frame"},
                status_code=500,
            )

        try:
            grid = (
                Regions.select(Regions.grid)
                .where(Regions.camera == camera_name)
                .get()
                .grid
            )
        except DoesNotExist:
            return JSONResponse(
                content={"success": False, "message": "Unable to get region grid"},
                status_code=500,
            )

        color_arg = color.lower()

        if color_arg == "red":
            draw_color = (0, 0, 255)
        elif color_arg == "blue":
            draw_color = (255, 0, 0)
        elif color_arg == "black":
            draw_color = (0, 0, 0)
        elif color_arg == "white":
            draw_color = (255, 255, 255)
        else:
            draw_color = (0, 255, 0)  # green

        grid_size = len(grid)
        grid_coef = 1.0 / grid_size
        width = detect.width
        height = detect.height
        for x in range(grid_size):
            for y in range(grid_size):
                cell = grid[x][y]

                if len(cell["sizes"]) == 0:
                    continue

                std_dev = round(cell["std_dev"] * width, 2)
                mean = round(cell["mean"] * width, 2)
                cv2.rectangle(
                    frame,
                    (int(x * grid_coef * width), int(y * grid_coef * height)),
                    (
                        int((x + 1) * grid_coef * width),
                        int((y + 1) * grid_coef * height),
                    ),
                    draw_color,
                    2,
                )
                cv2.putText(
                    frame,
                    f"#: {len(cell['sizes'])}",
                    (
                        int(x * grid_coef * width + 10),
                        int((y * grid_coef + 0.02) * height),
                    ),
                    cv2.FONT_HERSHEY_SIMPLEX,
                    fontScale=font_scale,
                    color=draw_color,
                    thickness=2,
                )
                cv2.putText(
                    frame,
                    f"std: {std_dev}",
                    (
                        int(x * grid_coef * width + 10),
                        int((y * grid_coef + 0.05) * height),
                    ),
                    cv2.FONT_HERSHEY_SIMPLEX,
                    fontScale=font_scale,
                    color=draw_color,
                    thickness=2,
                )
                cv2.putText(
                    frame,
                    f"avg: {mean}",
                    (
                        int(x * grid_coef * width + 10),
                        int((y * grid_coef + 0.08) * height),
                    ),
                    cv2.FONT_HERSHEY_SIMPLEX,
                    fontScale=font_scale,
                    color=draw_color,
                    thickness=2,
                )

        ret, jpg = cv2.imencode(".jpg", frame, [int(cv2.IMWRITE_JPEG_QUALITY), 70])

        return Response(
            jpg.tobytes,
            media_type="image/jpeg",
            headers={"Cache-Control": "no-store"},
        )
    else:
        return JSONResponse(
            content={"success": False, "message": "Camera not found"},
            status_code=404,
        )


@router.get("/events/{event_id}/snapshot-clean.png")
def event_snapshot_clean(request: Request, event_id: str, download: bool = False):
    png_bytes = None
    try:
        event = Event.get(Event.id == event_id)
        snapshot_config = request.app.frigate_config.cameras[event.camera].snapshots
        if not (snapshot_config.enabled and event.has_snapshot):
            return JSONResponse(
                content={
                    "success": False,
                    "message": "Snapshots and clean_copy must be enabled in the config",
                },
                status_code=404,
            )
        if event.end_time is None:
            # see if the object is currently being tracked
            try:
                camera_states = (
                    request.app.detected_frames_processor.camera_states.values()
                )
                for camera_state in camera_states:
                    if event_id in camera_state.tracked_objects:
                        tracked_obj = camera_state.tracked_objects.get(event_id)
                        if tracked_obj is not None:
                            png_bytes = tracked_obj.get_clean_png()
                            break
            except Exception:
                return JSONResponse(
                    content={"success": False, "message": "Event not found"},
                    status_code=404,
                )
        elif not event.has_snapshot:
            return JSONResponse(
                content={"success": False, "message": "Snapshot not available"},
                status_code=404,
            )
    except DoesNotExist:
        return JSONResponse(
            content={"success": False, "message": "Event not found"}, status_code=404
        )
    if png_bytes is None:
        try:
            clean_snapshot_path = os.path.join(
                CLIPS_DIR, f"{event.camera}-{event.id}-clean.png"
            )
            if not os.path.exists(clean_snapshot_path):
                return JSONResponse(
                    content={
                        "success": False,
                        "message": "Clean snapshot not available",
                    },
                    status_code=404,
                )
            with open(
                os.path.join(CLIPS_DIR, f"{event.camera}-{event.id}-clean.png"), "rb"
            ) as image_file:
                png_bytes = image_file.read()
        except Exception:
            logger.error(f"Unable to load clean png for event: {event.id}")
            return JSONResponse(
                content={
                    "success": False,
                    "message": "Unable to load clean png for event",
                },
                status_code=400,
            )

    headers = {
        "Content-Type": "image/png",
        "Cache-Control": "private, max-age=31536000",
    }

    if download:
        headers["Content-Disposition"] = (
            f"attachment; filename=snapshot-{event_id}-clean.png"
        )

    return Response(
        png_bytes,
        media_type="image/png",
        headers=headers,
    )


@router.get("/events/{event_id}/clip.mp4")
def event_clip(request: Request, event_id: str):
    try:
        event: Event = Event.get(Event.id == event_id)
    except DoesNotExist:
        return JSONResponse(
            content={"success": False, "message": "Event not found"}, status_code=404
        )

    if not event.has_clip:
        return JSONResponse(
            content={"success": False, "message": "Clip not available"}, status_code=404
        )

    file_name = f"{event.camera}-{event.id}.mp4"
    clip_path = os.path.join(CLIPS_DIR, file_name)

    if not os.path.isfile(clip_path):
        end_ts = (
            datetime.now().timestamp() if event.end_time is None else event.end_time
        )
        return recording_clip(request, event.camera, event.start_time, end_ts)

    headers = {
        "Content-Description": "File Transfer",
        "Cache-Control": "no-cache",
        "Content-Type": "video/mp4",
        "Content-Length": str(os.path.getsize(clip_path)),
        # nginx: https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_ignore_headers
        "X-Accel-Redirect": f"/clips/{file_name}",
    }

    return FileResponse(
        clip_path,
        media_type="video/mp4",
        filename=file_name,
        headers=headers,
    )


@router.get("/events/{event_id}/preview.gif")
def event_preview(request: Request, event_id: str):
    try:
        event: Event = Event.get(Event.id == event_id)
    except DoesNotExist:
        return JSONResponse(
            content={"success": False, "message": "Event not found"}, status_code=404
        )

    start_ts = event.start_time
    end_ts = start_ts + (
        min(event.end_time - event.start_time, 20) if event.end_time else 20
    )
    return preview_gif(request, event.camera, start_ts, end_ts)


@router.get("/{camera_name}/start/{start_ts}/end/{end_ts}/preview.gif")
def preview_gif(
    request: Request,
    camera_name: str,
    start_ts: float,
    end_ts: float,
    max_cache_age: int = Query(
        2592000, description="Max cache age in seconds. Default 30 days in seconds."
    ),
):
    if datetime.fromtimestamp(start_ts) < datetime.now().replace(minute=0, second=0):
        # has preview mp4
        preview: Previews = (
            Previews.select(
                Previews.camera,
                Previews.path,
                Previews.duration,
                Previews.start_time,
                Previews.end_time,
            )
            .where(
                Previews.start_time.between(start_ts, end_ts)
                | Previews.end_time.between(start_ts, end_ts)
                | ((start_ts > Previews.start_time) & (end_ts < Previews.end_time))
            )
            .where(Previews.camera == camera_name)
            .limit(1)
            .get()
        )

        if not preview:
            return JSONResponse(
                content={"success": False, "message": "Preview not found"},
                status_code=404,
            )

        diff = start_ts - preview.start_time
        minutes = int(diff / 60)
        seconds = int(diff % 60)
        config: FrigateConfig = request.app.frigate_config
        ffmpeg_cmd = [
            config.ffmpeg.ffmpeg_path,
            "-hide_banner",
            "-loglevel",
            "warning",
            "-ss",
            f"00:{minutes}:{seconds}",
            "-t",
            f"{end_ts - start_ts}",
            "-i",
            preview.path,
            "-r",
            "8",
            "-vf",
            "setpts=0.12*PTS",
            "-loop",
            "0",
            "-c:v",
            "gif",
            "-f",
            "gif",
            "-",
        ]

        process = sp.run(
            ffmpeg_cmd,
            capture_output=True,
        )

        if process.returncode != 0:
            logger.error(process.stderr)
            return JSONResponse(
                content={"success": False, "message": "Unable to create preview gif"},
                status_code=500,
            )

        gif_bytes = process.stdout
    else:
        # need to generate from existing images
        preview_dir = os.path.join(CACHE_DIR, "preview_frames")
        file_start = f"preview_{camera_name}"
        start_file = f"{file_start}-{start_ts}.{PREVIEW_FRAME_TYPE}"
        end_file = f"{file_start}-{end_ts}.{PREVIEW_FRAME_TYPE}"
        selected_previews = []

        for file in sorted(os.listdir(preview_dir)):
            if not file.startswith(file_start):
                continue

            if file < start_file:
                continue

            if file > end_file:
                break

            selected_previews.append(f"file '{os.path.join(preview_dir, file)}'")
            selected_previews.append("duration 0.12")

        if not selected_previews:
            return JSONResponse(
                content={"success": False, "message": "Preview not found"},
                status_code=404,
            )

        last_file = selected_previews[-2]
        selected_previews.append(last_file)
        config: FrigateConfig = request.app.frigate_config

        ffmpeg_cmd = [
            config.ffmpeg.ffmpeg_path,
            "-hide_banner",
            "-loglevel",
            "warning",
            "-f",
            "concat",
            "-y",
            "-protocol_whitelist",
            "pipe,file",
            "-safe",
            "0",
            "-i",
            "/dev/stdin",
            "-loop",
            "0",
            "-c:v",
            "gif",
            "-f",
            "gif",
            "-",
        ]

        process = sp.run(
            ffmpeg_cmd,
            input=str.encode("\n".join(selected_previews)),
            capture_output=True,
        )

        if process.returncode != 0:
            logger.error(process.stderr)
            return JSONResponse(
                content={"success": False, "message": "Unable to create preview gif"},
                status_code=500,
            )

        gif_bytes = process.stdout

    return Response(
        gif_bytes,
        media_type="image/gif",
        headers={
            "Cache-Control": f"private, max-age={max_cache_age}",
            "Content-Type": "image/gif",
        },
    )


@router.get("/{camera_name}/start/{start_ts}/end/{end_ts}/preview.mp4")
def preview_mp4(
    request: Request,
    camera_name: str,
    start_ts: float,
    end_ts: float,
    max_cache_age: int = Query(
        604800, description="Max cache age in seconds. Default 7 days in seconds."
    ),
):
    file_name = sanitize_filename(f"preview_{camera_name}_{start_ts}-{end_ts}.mp4")

    if len(file_name) > 1000:
        return JSONResponse(
            content=(
                {
                    "success": False,
                    "message": "Filename exceeded max length of 1000 characters.",
                }
            ),
            status_code=403,
        )

    path = os.path.join(CACHE_DIR, file_name)

    if datetime.fromtimestamp(start_ts) < datetime.now().replace(minute=0, second=0):
        # has preview mp4
        try:
            preview: Previews = (
                Previews.select(
                    Previews.camera,
                    Previews.path,
                    Previews.duration,
                    Previews.start_time,
                    Previews.end_time,
                )
                .where(
                    Previews.start_time.between(start_ts, end_ts)
                    | Previews.end_time.between(start_ts, end_ts)
                    | ((start_ts > Previews.start_time) & (end_ts < Previews.end_time))
                )
                .where(Previews.camera == camera_name)
                .limit(1)
                .get()
            )
        except DoesNotExist:
            preview = None

        if not preview:
            return JSONResponse(
                content={"success": False, "message": "Preview not found"},
                status_code=404,
            )

        diff = start_ts - preview.start_time
        minutes = int(diff / 60)
        seconds = int(diff % 60)
        config: FrigateConfig = request.app.frigate_config
        ffmpeg_cmd = [
            config.ffmpeg.ffmpeg_path,
            "-hide_banner",
            "-loglevel",
            "warning",
            "-y",
            "-ss",
            f"00:{minutes}:{seconds}",
            "-t",
            f"{end_ts - start_ts}",
            "-i",
            preview.path,
            "-r",
            "8",
            "-vf",
            "setpts=0.12*PTS",
            "-c:v",
            "libx264",
            "-movflags",
            "+faststart",
            path,
        ]

        process = sp.run(
            ffmpeg_cmd,
            capture_output=True,
        )

        if process.returncode != 0:
            logger.error(process.stderr)
            return JSONResponse(
                content={"success": False, "message": "Unable to create preview gif"},
                status_code=500,
            )

    else:
        # need to generate from existing images
        preview_dir = os.path.join(CACHE_DIR, "preview_frames")
        file_start = f"preview_{camera_name}"
        start_file = f"{file_start}-{start_ts}.{PREVIEW_FRAME_TYPE}"
        end_file = f"{file_start}-{end_ts}.{PREVIEW_FRAME_TYPE}"
        selected_previews = []

        for file in sorted(os.listdir(preview_dir)):
            if not file.startswith(file_start):
                continue

            if file < start_file:
                continue

            if file > end_file:
                break

            selected_previews.append(f"file '{os.path.join(preview_dir, file)}'")
            selected_previews.append("duration 0.12")

        if not selected_previews:
            return JSONResponse(
                content={"success": False, "message": "Preview not found"},
                status_code=404,
            )

        last_file = selected_previews[-2]
        selected_previews.append(last_file)
        config: FrigateConfig = request.app.frigate_config

        ffmpeg_cmd = [
            config.ffmpeg.ffmpeg_path,
            "-hide_banner",
            "-loglevel",
            "warning",
            "-f",
            "concat",
            "-y",
            "-protocol_whitelist",
            "pipe,file",
            "-safe",
            "0",
            "-i",
            "/dev/stdin",
            "-c:v",
            "libx264",
            "-movflags",
            "+faststart",
            path,
        ]

        process = sp.run(
            ffmpeg_cmd,
            input=str.encode("\n".join(selected_previews)),
            capture_output=True,
        )

        if process.returncode != 0:
            logger.error(process.stderr)
            return JSONResponse(
                content={"success": False, "message": "Unable to create preview gif"},
                status_code=500,
            )

    headers = {
        "Content-Description": "File Transfer",
        "Cache-Control": f"private, max-age={max_cache_age}",
        "Content-Type": "video/mp4",
        "Content-Length": str(os.path.getsize(path)),
        # nginx: https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_ignore_headers
        "X-Accel-Redirect": f"/cache/{file_name}",
    }

    return FileResponse(
        path,
        media_type="video/mp4",
        filename=file_name,
        headers=headers,
    )


@router.get("/review/{event_id}/preview")
def review_preview(
    request: Request,
    event_id: str,
    format: str = Query(default="gif", enum=["gif", "mp4"]),
):
    try:
        review: ReviewSegment = ReviewSegment.get(ReviewSegment.id == event_id)
    except DoesNotExist:
        return JSONResponse(
            content=({"success": False, "message": "Review segment not found"}),
            status_code=404,
        )

    padding = 8
    start_ts = review.start_time - padding
    end_ts = (
        review.end_time + padding if review.end_time else datetime.now().timestamp()
    )

    if format == "gif":
        return preview_gif(request, review.camera, start_ts, end_ts)
    else:
        return preview_mp4(request, review.camera, start_ts, end_ts)


@router.get("/preview/{file_name}/thumbnail.jpg")
@router.get("/preview/{file_name}/thumbnail.webp")
def preview_thumbnail(file_name: str):
    """Get a thumbnail from the cached preview frames."""
    if len(file_name) > 1000:
        return JSONResponse(
            content=(
                {"success": False, "message": "Filename exceeded max length of 1000"}
            ),
            status_code=403,
        )

    safe_file_name_current = sanitize_filename(file_name)
    preview_dir = os.path.join(CACHE_DIR, "preview_frames")

    try:
        with open(
            os.path.join(preview_dir, safe_file_name_current), "rb"
        ) as image_file:
            jpg_bytes = image_file.read()
    except FileNotFoundError:
        return JSONResponse(
            content=({"success": False, "message": "Image file not found"}),
            status_code=404,
        )

    return Response(
        jpg_bytes,
        # FIXME: Shouldn't it be either jpg or webp depending on the endpoint?
        media_type="image/webp",
        headers={
            "Content-Type": "image/webp",
            "Cache-Control": "private, max-age=31536000",
        },
    )


####################### dynamic routes ###########################


@router.get("/{camera_name}/{label}/best.jpg")
@router.get("/{camera_name}/{label}/thumbnail.jpg")
def label_thumbnail(request: Request, camera_name: str, label: str):
    label = unquote(label)
    event_query = Event.select(fn.MAX(Event.id)).where(Event.camera == camera_name)
    if label != "any":
        event_query = event_query.where(Event.label == label)

    try:
        event_id = event_query.scalar()

        return event_thumbnail(request, event_id, 60)
    except DoesNotExist:
        frame = np.zeros((175, 175, 3), np.uint8)
        ret, jpg = cv2.imencode(".jpg", frame, [int(cv2.IMWRITE_JPEG_QUALITY), 70])

        return Response(
            jpg.tobytes,
            media_type="image/jpeg",
            headers={"Cache-Control": "no-store"},
        )


@router.get("/{camera_name}/{label}/clip.mp4")
def label_clip(request: Request, camera_name: str, label: str):
    label = unquote(label)
    event_query = Event.select(fn.MAX(Event.id)).where(
        Event.camera == camera_name, Event.has_clip == True
    )
    if label != "any":
        event_query = event_query.where(Event.label == label)

    try:
        event = event_query.get()

        return event_clip(request, event.id)
    except DoesNotExist:
        return JSONResponse(
            content={"success": False, "message": "Event not found"}, status_code=404
        )


@router.get("/{camera_name}/{label}/snapshot.jpg")
def label_snapshot(request: Request, camera_name: str, label: str):
    """Returns the snapshot image from the latest event for the given camera and label combo"""
    label = unquote(label)
    if label == "any":
        event_query = (
            Event.select(Event.id)
            .where(Event.camera == camera_name)
            .where(Event.has_snapshot == True)
            .order_by(Event.start_time.desc())
        )
    else:
        event_query = (
            Event.select(Event.id)
            .where(Event.camera == camera_name)
            .where(Event.label == label)
            .where(Event.has_snapshot == True)
            .order_by(Event.start_time.desc())
        )

    try:
        event = event_query.get()
        return event_snapshot(request, event.id)
    except DoesNotExist:
        frame = np.zeros((720, 1280, 3), np.uint8)
        ret, jpg = cv2.imencode(".jpg", frame, [int(cv2.IMWRITE_JPEG_QUALITY), 70])

        return Response(
            jpg.tobytes,
            media_type="image/jpeg",
        )