[libcamera-devel,v4,2/2] ipa: rpi: vc4: data: Update tuning files for HDR
diff mbox series

Message ID 20240109102547.2762-3-david.plowman@raspberrypi.com
State Accepted
Headers show
Series
  • HDR for Raspberry Pi
Related show

Commit Message

David Plowman Jan. 9, 2024, 10:25 a.m. UTC 
All the Raspberry Pi official camera tuning files are updated for
HDR. As stated previously, there is no mechanism in the hardware for
combining images so all this does is enable multi-channel AGC to
produce short and long exposure frames. It will be up to the
application to deal with them.

The changes are identical in every tuning file.

1. The existing AGC tuning is duplicated twice so that we have 3 AGC
channels.

2. The first is left alone (the default AGC channel), the second is
tweaked to under-expose significantly (ev -3) and the final one is
tweaked to over-exposure slightly (ev +0.5)

3. Control parameters are provided to the "rpi.hdr" algorithm to
associate these AGC channels correctly with the HDR modes.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
---
 src/ipa/rpi/vc4/data/imx219.json           | 384 +++++++++++++++-----
 src/ipa/rpi/vc4/data/imx219_noir.json      | 384 +++++++++++++++-----
 src/ipa/rpi/vc4/data/imx477.json           | 376 +++++++++++++++-----
 src/ipa/rpi/vc4/data/imx477_noir.json      | 384 +++++++++++++++-----
 src/ipa/rpi/vc4/data/imx708.json           | 346 +++++++++++++-----
 src/ipa/rpi/vc4/data/imx708_noir.json      | 346 +++++++++++++-----
 src/ipa/rpi/vc4/data/imx708_wide.json      | 346 +++++++++++++-----
 src/ipa/rpi/vc4/data/imx708_wide_noir.json | 346 +++++++++++++-----
 src/ipa/rpi/vc4/data/ov5647.json           | 388 ++++++++++++++++-----
 9 files changed, 2524 insertions(+), 776 deletions(-)

Comments

Kieran Bingham Jan. 9, 2024, 10:43 a.m. UTC | #1 
Quoting David Plowman via libcamera-devel (2024-01-09 10:25:47)
> All the Raspberry Pi official camera tuning files are updated for
> HDR. As stated previously, there is no mechanism in the hardware for
> combining images so all this does is enable multi-channel AGC to
> produce short and long exposure frames. It will be up to the
> application to deal with them.
> 
> The changes are identical in every tuning file.
> 
> 1. The existing AGC tuning is duplicated twice so that we have 3 AGC
> channels.
> 
> 2. The first is left alone (the default AGC channel), the second is
> tweaked to under-expose significantly (ev -3) and the final one is
> tweaked to over-exposure slightly (ev +0.5)
> 
> 3. Control parameters are provided to the "rpi.hdr" algorithm to
> associate these AGC channels correctly with the HDR modes.
> 
> Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
> ---
>  src/ipa/rpi/vc4/data/imx219.json           | 384 +++++++++++++++-----
>  src/ipa/rpi/vc4/data/imx219_noir.json      | 384 +++++++++++++++-----
>  src/ipa/rpi/vc4/data/imx477.json           | 376 +++++++++++++++-----
>  src/ipa/rpi/vc4/data/imx477_noir.json      | 384 +++++++++++++++-----
>  src/ipa/rpi/vc4/data/imx708.json           | 346 +++++++++++++-----
>  src/ipa/rpi/vc4/data/imx708_noir.json      | 346 +++++++++++++-----
>  src/ipa/rpi/vc4/data/imx708_wide.json      | 346 +++++++++++++-----
>  src/ipa/rpi/vc4/data/imx708_wide_noir.json | 346 +++++++++++++-----
>  src/ipa/rpi/vc4/data/ov5647.json           | 388 ++++++++++++++++-----
>  9 files changed, 2524 insertions(+), 776 deletions(-)
> 
> diff --git a/src/ipa/rpi/vc4/data/imx219.json b/src/ipa/rpi/vc4/data/imx219.json
> index e8fce164..54defc0b 100644
> --- a/src/ipa/rpi/vc4/data/imx219.json
> +++ b/src/ipa/rpi/vc4/data/imx219.json
> @@ -131,95 +131,282 @@
>          {
>              "rpi.agc":
>              {
> -                "metering_modes":
> -                {
> -                    "centre-weighted":
> -                    {
> -                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
> -                    },
> -                    "spot":
> -                    {
> -                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
> -                    },
> -                    "matrix":
> -                    {
> -                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
> -                    }
> -                },
> -                "exposure_modes":
> -                {
> -                    "normal":
> -                    {
> -                        "shutter": [ 100, 10000, 30000, 60000, 66666 ],
> -                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
> -                    },
> -                    "short":
> -                    {
> -                        "shutter": [ 100, 5000, 10000, 20000, 33333 ],
> -                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
> -                    },
> -                    "long":
> -                    {
> -                        "shutter": [ 100, 10000, 30000, 60000, 120000 ],
> -                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
> -                    }
> -                },
> -                "constraint_modes":
> -                {
> -                    "normal": [
> -                        {
> -                            "bound": "LOWER",
> -                            "q_lo": 0.98,
> -                            "q_hi": 1.0,
> -                            "y_target":
> -                            [
> -                                0, 0.5,
> -                                1000, 0.5
> -                            ]
> -                        }
> -                    ],
> -                    "highlight": [
> -                        {
> -                            "bound": "LOWER",
> -                            "q_lo": 0.98,
> -                            "q_hi": 1.0,
> -                            "y_target":
> -                            [
> -                                0, 0.5,
> -                                1000, 0.5
> -                            ]
> -                        },
> -                        {
> -                            "bound": "UPPER",
> -                            "q_lo": 0.98,
> -                            "q_hi": 1.0,
> -                            "y_target":
> -                            [
> -                                0, 0.8,
> -                                1000, 0.8
> -                            ]
> -                        }
> -                    ],
> -                    "shadows": [
> -                        {
> -                            "bound": "LOWER",
> -                            "q_lo": 0.0,
> -                            "q_hi": 0.5,
> -                            "y_target":
> -                            [
> -                                0, 0.17,
> -                                1000, 0.17
> -                            ]
> -                        }
> -                    ]
> -                },
> -                "y_target":
> -                [
> -                    0, 0.16,
> -                    1000, 0.165,
> -                    10000, 0.17
> -                ]
> -            }
> +               "channels":
> +               [
> +                   {
> +                       "metering_modes":

It looks like this 'breaks' ABI of the tuning files.
Should there be a corresponding bump of the tuning file version number
with a check? (2.1?) or does the rpi.agc implementation fall back to the
'unchanneled' layout if there are no channels?

As long as it falls back then:

Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

--
Kieran
David Plowman Jan. 9, 2024, 1:28 p.m. UTC | #2 
Hi Kieran

On Tue, 9 Jan 2024 at 10:43, Kieran Bingham
<kieran.bingham@ideasonboard.com> wrote:
>
> Quoting David Plowman via libcamera-devel (2024-01-09 10:25:47)
> > All the Raspberry Pi official camera tuning files are updated for
> > HDR. As stated previously, there is no mechanism in the hardware for
> > combining images so all this does is enable multi-channel AGC to
> > produce short and long exposure frames. It will be up to the
> > application to deal with them.
> >
> > The changes are identical in every tuning file.
> >
> > 1. The existing AGC tuning is duplicated twice so that we have 3 AGC
> > channels.
> >
> > 2. The first is left alone (the default AGC channel), the second is
> > tweaked to under-expose significantly (ev -3) and the final one is
> > tweaked to over-exposure slightly (ev +0.5)
> >
> > 3. Control parameters are provided to the "rpi.hdr" algorithm to
> > associate these AGC channels correctly with the HDR modes.
> >
> > Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
> > ---
> >  src/ipa/rpi/vc4/data/imx219.json           | 384 +++++++++++++++-----
> >  src/ipa/rpi/vc4/data/imx219_noir.json      | 384 +++++++++++++++-----
> >  src/ipa/rpi/vc4/data/imx477.json           | 376 +++++++++++++++-----
> >  src/ipa/rpi/vc4/data/imx477_noir.json      | 384 +++++++++++++++-----
> >  src/ipa/rpi/vc4/data/imx708.json           | 346 +++++++++++++-----
> >  src/ipa/rpi/vc4/data/imx708_noir.json      | 346 +++++++++++++-----
> >  src/ipa/rpi/vc4/data/imx708_wide.json      | 346 +++++++++++++-----
> >  src/ipa/rpi/vc4/data/imx708_wide_noir.json | 346 +++++++++++++-----
> >  src/ipa/rpi/vc4/data/ov5647.json           | 388 ++++++++++++++++-----
> >  9 files changed, 2524 insertions(+), 776 deletions(-)
> >
> > diff --git a/src/ipa/rpi/vc4/data/imx219.json b/src/ipa/rpi/vc4/data/imx219.json
> > index e8fce164..54defc0b 100644
> > --- a/src/ipa/rpi/vc4/data/imx219.json
> > +++ b/src/ipa/rpi/vc4/data/imx219.json
> > @@ -131,95 +131,282 @@
> >          {
> >              "rpi.agc":
> >              {
> > -                "metering_modes":
> > -                {
> > -                    "centre-weighted":
> > -                    {
> > -                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
> > -                    },
> > -                    "spot":
> > -                    {
> > -                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
> > -                    },
> > -                    "matrix":
> > -                    {
> > -                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
> > -                    }
> > -                },
> > -                "exposure_modes":
> > -                {
> > -                    "normal":
> > -                    {
> > -                        "shutter": [ 100, 10000, 30000, 60000, 66666 ],
> > -                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
> > -                    },
> > -                    "short":
> > -                    {
> > -                        "shutter": [ 100, 5000, 10000, 20000, 33333 ],
> > -                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
> > -                    },
> > -                    "long":
> > -                    {
> > -                        "shutter": [ 100, 10000, 30000, 60000, 120000 ],
> > -                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
> > -                    }
> > -                },
> > -                "constraint_modes":
> > -                {
> > -                    "normal": [
> > -                        {
> > -                            "bound": "LOWER",
> > -                            "q_lo": 0.98,
> > -                            "q_hi": 1.0,
> > -                            "y_target":
> > -                            [
> > -                                0, 0.5,
> > -                                1000, 0.5
> > -                            ]
> > -                        }
> > -                    ],
> > -                    "highlight": [
> > -                        {
> > -                            "bound": "LOWER",
> > -                            "q_lo": 0.98,
> > -                            "q_hi": 1.0,
> > -                            "y_target":
> > -                            [
> > -                                0, 0.5,
> > -                                1000, 0.5
> > -                            ]
> > -                        },
> > -                        {
> > -                            "bound": "UPPER",
> > -                            "q_lo": 0.98,
> > -                            "q_hi": 1.0,
> > -                            "y_target":
> > -                            [
> > -                                0, 0.8,
> > -                                1000, 0.8
> > -                            ]
> > -                        }
> > -                    ],
> > -                    "shadows": [
> > -                        {
> > -                            "bound": "LOWER",
> > -                            "q_lo": 0.0,
> > -                            "q_hi": 0.5,
> > -                            "y_target":
> > -                            [
> > -                                0, 0.17,
> > -                                1000, 0.17
> > -                            ]
> > -                        }
> > -                    ]
> > -                },
> > -                "y_target":
> > -                [
> > -                    0, 0.16,
> > -                    1000, 0.165,
> > -                    10000, 0.17
> > -                ]
> > -            }
> > +               "channels":
> > +               [
> > +                   {
> > +                       "metering_modes":
>
> It looks like this 'breaks' ABI of the tuning files.
> Should there be a corresponding bump of the tuning file version number
> with a check? (2.1?) or does the rpi.agc implementation fall back to the
> 'unchanneled' layout if there are no channels?
>
> As long as it falls back then:

Yes, good to check this. But I think we're OK because Agc::read
(src/ipa/rpi/controller/rpi/agc.cpp line 34) still reads the
"channel-less" version as just being a single channel.

David

>
> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
>
> --
> Kieran

Patch
diff mbox series 

diff --git a/src/ipa/rpi/vc4/data/imx219.json b/src/ipa/rpi/vc4/data/imx219.json
index e8fce164..54defc0b 100644
--- a/src/ipa/rpi/vc4/data/imx219.json
+++ b/src/ipa/rpi/vc4/data/imx219.json
@@ -131,95 +131,282 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 66666 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 33333 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.5,
-                                1000, 0.5
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.5,
-                                1000, 0.5
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ],
-                    "shadows": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.0,
-                            "q_hi": 0.5,
-                            "y_target":
-                            [
-                                0, 0.17,
-                                1000, 0.17
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ]
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -463,6 +650,21 @@ 
         },
         {
             "rpi.sharpen": { }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
-}
\ No newline at end of file
+}
diff --git a/src/ipa/rpi/vc4/data/imx219_noir.json b/src/ipa/rpi/vc4/data/imx219_noir.json
index cfedb943..e823a90d 100644
--- a/src/ipa/rpi/vc4/data/imx219_noir.json
+++ b/src/ipa/rpi/vc4/data/imx219_noir.json
@@ -47,95 +47,282 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 66666 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 33333 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.5,
-                                1000, 0.5
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.5,
-                                1000, 0.5
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ],
-                    "shadows": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.0,
-                            "q_hi": 0.5,
-                            "y_target":
-                            [
-                                0, 0.17,
-                                1000, 0.17
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ]
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -397,6 +584,21 @@ 
         },
         {
             "rpi.sharpen": { }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
-}
\ No newline at end of file
+}
diff --git a/src/ipa/rpi/vc4/data/imx477.json b/src/ipa/rpi/vc4/data/imx477.json
index 0e39d419..853bfa67 100644
--- a/src/ipa/rpi/vc4/data/imx477.json
+++ b/src/ipa/rpi/vc4/data/imx477.json
@@ -136,95 +136,282 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
+		"channels":
+		[
                     {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
                     {
-                        "shutter": [ 100, 10000, 30000, 60000, 66666 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "short":
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
                     {
-                        "shutter": [ 100, 5000, 10000, 20000, 33333 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.3,
-                                1000, 0.3
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.3,
-                                1000, 0.3
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ],
-                    "shadows": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.0,
-                            "q_hi": 0.5,
-                            "y_target":
-                            [
-                                0, 0.17,
-                                1000, 0.17
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ]
-            }
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -468,6 +655,21 @@ 
         },
         {
             "rpi.sharpen": { }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
 }
\ No newline at end of file
diff --git a/src/ipa/rpi/vc4/data/imx477_noir.json b/src/ipa/rpi/vc4/data/imx477_noir.json
index 52d7f072..143e20bd 100644
--- a/src/ipa/rpi/vc4/data/imx477_noir.json
+++ b/src/ipa/rpi/vc4/data/imx477_noir.json
@@ -47,95 +47,282 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 66666 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 33333 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.3,
-                                1000, 0.3
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.3,
-                                1000, 0.3
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ],
-                    "shadows": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.0,
-                            "q_hi": 0.5,
-                            "y_target":
-                            [
-                                0, 0.17,
-                                1000, 0.17
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ]
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.3,
+					1000, 0.3
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			]
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -424,6 +611,21 @@ 
         },
         {
             "rpi.sharpen": { }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
-}
\ No newline at end of file
+}
diff --git a/src/ipa/rpi/vc4/data/imx708.json b/src/ipa/rpi/vc4/data/imx708.json
index c40a5994..26aafc95 100644
--- a/src/ipa/rpi/vc4/data/imx708.json
+++ b/src/ipa/rpi/vc4/data/imx708.json
@@ -139,86 +139,255 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 15000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 1000, 30000, 60000, 90000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ],
-                "startup_frames": 5,
-                "convergence_frames": 6,
-                "speed": 0.15
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -457,6 +626,21 @@ 
                 "skip_frames": 5,
                 "map": [ 0.0, 445, 15.0, 925 ]
             }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
 }
diff --git a/src/ipa/rpi/vc4/data/imx708_noir.json b/src/ipa/rpi/vc4/data/imx708_noir.json
index 8d498153..8259ca4d 100644
--- a/src/ipa/rpi/vc4/data/imx708_noir.json
+++ b/src/ipa/rpi/vc4/data/imx708_noir.json
@@ -139,86 +139,255 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 15000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 1000, 30000, 60000, 90000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ],
-                "startup_frames": 5,
-                "convergence_frames": 6,
-                "speed": 0.15
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -556,6 +725,21 @@ 
                 "skip_frames": 5,
                 "map": [ 0.0, 445, 15.0, 925 ]
             }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
 }
diff --git a/src/ipa/rpi/vc4/data/imx708_wide.json b/src/ipa/rpi/vc4/data/imx708_wide.json
index 65543628..0f846ea2 100644
--- a/src/ipa/rpi/vc4/data/imx708_wide.json
+++ b/src/ipa/rpi/vc4/data/imx708_wide.json
@@ -129,86 +129,255 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 15000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 1000, 30000, 60000, 90000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ],
-                "startup_frames": 5,
-                "convergence_frames": 6,
-                "speed": 0.15
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -468,6 +637,21 @@ 
                 "skip_frames": 5,
                 "map": [ 0.0, 420, 35.0, 920 ]
             }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
 }
diff --git a/src/ipa/rpi/vc4/data/imx708_wide_noir.json b/src/ipa/rpi/vc4/data/imx708_wide_noir.json
index 49442c0f..f12ddbb6 100644
--- a/src/ipa/rpi/vc4/data/imx708_wide_noir.json
+++ b/src/ipa/rpi/vc4/data/imx708_wide_noir.json
@@ -129,86 +129,255 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 15000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 1000, 30000, 60000, 90000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.2,
-                                1000, 0.2
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ],
-                "startup_frames": 5,
-                "convergence_frames": 6,
-                "speed": 0.15
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 15000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 1.0, 2.0, 4.0, 6.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 6.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.2,
+					1000, 0.2
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"startup_frames": 5,
+			"convergence_frames": 6,
+			"speed": 0.15
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -459,6 +628,21 @@ 
                 "skip_frames": 5,
                 "map": [ 0.0, 420, 35.0, 920 ]
             }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
 }
diff --git a/src/ipa/rpi/vc4/data/ov5647.json b/src/ipa/rpi/vc4/data/ov5647.json
index a1b42a18..4def9ffc 100644
--- a/src/ipa/rpi/vc4/data/ov5647.json
+++ b/src/ipa/rpi/vc4/data/ov5647.json
@@ -131,96 +131,285 @@ 
         {
             "rpi.agc":
             {
-                "metering_modes":
-                {
-                    "centre-weighted":
-                    {
-                        "weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
-                    },
-                    "spot":
-                    {
-                        "weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
-                    },
-                    "matrix":
-                    {
-                        "weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
-                    }
-                },
-                "exposure_modes":
-                {
-                    "normal":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 66666 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "short":
-                    {
-                        "shutter": [ 100, 5000, 10000, 20000, 33333 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
-                    },
-                    "long":
-                    {
-                        "shutter": [ 100, 10000, 30000, 60000, 120000 ],
-                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
-                    }
-                },
-                "constraint_modes":
-                {
-                    "normal": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.5,
-                                1000, 0.5
-                            ]
-                        }
-                    ],
-                    "highlight": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.5,
-                                1000, 0.5
-                            ]
-                        },
-                        {
-                            "bound": "UPPER",
-                            "q_lo": 0.98,
-                            "q_hi": 1.0,
-                            "y_target":
-                            [
-                                0, 0.8,
-                                1000, 0.8
-                            ]
-                        }
-                    ],
-                    "shadows": [
-                        {
-                            "bound": "LOWER",
-                            "q_lo": 0.0,
-                            "q_hi": 0.5,
-                            "y_target":
-                            [
-                                0, 0.17,
-                                1000, 0.17
-                            ]
-                        }
-                    ]
-                },
-                "y_target":
-                [
-                    0, 0.16,
-                    1000, 0.165,
-                    10000, 0.17
-                ],
-                "base_ev": 1.25
-            }
+		"channels":
+		[
+		    {
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"base_ev": 1.25
+		    },
+		    {
+			"base_ev": 0.125,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"base_ev": 1.25
+		    },
+		    {
+			"base_ev": 1.5,
+			"metering_modes":
+			{
+			    "centre-weighted":
+			    {
+				"weights": [ 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0 ]
+			    },
+			    "spot":
+			    {
+				"weights": [ 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
+			    },
+			    "matrix":
+			    {
+				"weights": [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ]
+			    }
+			},
+			"exposure_modes":
+			{
+			    "normal":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 66666 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "short":
+			    {
+				"shutter": [ 100, 5000, 10000, 20000, 33333 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+			    },
+			    "long":
+			    {
+				"shutter": [ 100, 10000, 30000, 60000, 120000 ],
+				"gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+			    }
+			},
+			"constraint_modes":
+			{
+			    "normal": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				}
+			    ],
+			    "highlight": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.5,
+					1000, 0.5
+				    ]
+				},
+				{
+				    "bound": "UPPER",
+				    "q_lo": 0.98,
+				    "q_hi": 1.0,
+				    "y_target":
+				    [
+					0, 0.8,
+					1000, 0.8
+				    ]
+				}
+			    ],
+			    "shadows": [
+				{
+				    "bound": "LOWER",
+				    "q_lo": 0.0,
+				    "q_hi": 0.5,
+				    "y_target":
+				    [
+					0, 0.17,
+					1000, 0.17
+				    ]
+				}
+			    ]
+			},
+			"y_target":
+			[
+			    0, 0.16,
+			    1000, 0.165,
+			    10000, 0.17
+			],
+			"base_ev": 1.25
+		    }
+		]
+	    }
         },
         {
             "rpi.alsc":
@@ -464,6 +653,21 @@ 
         },
         {
             "rpi.sharpen": { }
-        }
+        },
+	{
+	    "rpi.hdr":
+	    {
+		"MultiExposure":
+		{
+		    "cadence": [ 1, 2 ],
+		    "channel_map": { "short": 1, "long": 2 }
+		},
+		"SingleExposure":
+		{
+		    "cadence": [ 1 ],
+		    "channel_map": { "short": 1 }
+		}
+	    }
+	}
     ]
-}
\ No newline at end of file
+}