[FFmpeg-trac] #2305(avdevice:new): v4l2 user control configuration mechanism

FFmpeg trac at avcodec.org
Fri Jan 31 11:57:37 EET 2020


#2305: v4l2 user control configuration mechanism
-------------------------------------+------------------------------------
             Reporter:  elkq         |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avdevice
              Version:  git-master   |               Resolution:
             Keywords:  v4l2         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+------------------------------------

Comment (by spookybathtub):

 Here is a list of controls which could be added.  This list is from
 Raspbian Buster, so it includes some private controls such as
 `white_balance_auto_preset = greyworld` which is important for Pi NoIR
 Camera.

 Documentation and background info:
 https://www.kernel.org/doc/html/latest/media/uapi/v4l/control.html


 {{{
 $ v4l2-ctl -L

 User Controls

                      brightness 0x00980900 (int)    : min=0 max=100 step=1
 default=50 value=50 flags=slider
                        contrast 0x00980901 (int)    : min=-100 max=100
 step=1 default=0 value=0 flags=slider
                      saturation 0x00980902 (int)    : min=-100 max=100
 step=1 default=0 value=0 flags=slider
                     red_balance 0x0098090e (int)    : min=1 max=7999
 step=1 default=1000 value=1000 flags=slider
                    blue_balance 0x0098090f (int)    : min=1 max=7999
 step=1 default=1000 value=1000 flags=slider
                 horizontal_flip 0x00980914 (bool)   : default=0 value=0
                   vertical_flip 0x00980915 (bool)   : default=0 value=0
            power_line_frequency 0x00980918 (menu)   : min=0 max=3
 default=1 value=1
                                 0: Disabled
                                 1: 50 Hz
                                 2: 60 Hz
                                 3: Auto
                       sharpness 0x0098091b (int)    : min=-100 max=100
 step=1 default=0 value=0 flags=slider
                   color_effects 0x0098091f (menu)   : min=0 max=15
 default=0 value=0
                                 0: None
                                 1: Black & White
                                 2: Sepia
                                 3: Negative
                                 4: Emboss
                                 5: Sketch
                                 6: Sky Blue
                                 7: Grass Green
                                 8: Skin Whiten
                                 9: Vivid
                                 10: Aqua
                                 11: Art Freeze
                                 12: Silhouette
                                 13: Solarization
                                 14: Antique
                                 15: Set Cb/Cr
                          rotate 0x00980922 (int)    : min=0 max=360
 step=90 default=0 value=0 flags=modify-layout
              color_effects_cbcr 0x0098092a (int)    : min=0 max=65535
 step=1 default=32896 value=32896

 Codec Controls

              video_bitrate_mode 0x009909ce (menu)   : min=0 max=1
 default=0 value=0 flags=update
                                 0: Variable Bitrate
                                 1: Constant Bitrate
                   video_bitrate 0x009909cf (int)    : min=25000
 max=25000000 step=25000 default=10000000 value=5000000
          repeat_sequence_header 0x009909e2 (bool)   : default=0 value=0
             h264_i_frame_period 0x00990a66 (int)    : min=0 max=2147483647
 step=1 default=60 value=60
                      h264_level 0x00990a67 (menu)   : min=0 max=11
 default=11 value=11
                                 0: 1
                                 1: 1b
                                 2: 1.1
                                 3: 1.2
                                 4: 1.3
                                 5: 2
                                 6: 2.1
                                 7: 2.2
                                 8: 3
                                 9: 3.1
                                 10: 3.2
                                 11: 4
                    h264_profile 0x00990a6b (menu)   : min=0 max=4
 default=4 value=4
                                 0: Baseline
                                 1: Constrained Baseline
                                 2: Main
                                 4: High

 Camera Controls

                   auto_exposure 0x009a0901 (menu)   : min=0 max=3
 default=0 value=0
                                 0: Auto Mode
                                 1: Manual Mode
          exposure_time_absolute 0x009a0902 (int)    : min=1 max=10000
 step=1 default=1000 value=1000
      exposure_dynamic_framerate 0x009a0903 (bool)   : default=0 value=0
              auto_exposure_bias 0x009a0913 (intmenu): min=0 max=24
 default=12 value=12
                                 0: -4000 (0xfffffffffffff060)
                                 1: -3667 (0xfffffffffffff1ad)
                                 2: -3333 (0xfffffffffffff2fb)
                                 3: -3000 (0xfffffffffffff448)
                                 4: -2667 (0xfffffffffffff595)
                                 5: -2333 (0xfffffffffffff6e3)
                                 6: -2000 (0xfffffffffffff830)
                                 7: -1667 (0xfffffffffffff97d)
                                 8: -1333 (0xfffffffffffffacb)
                                 9: -1000 (0xfffffffffffffc18)
                                 10: -667 (0xfffffffffffffd65)
                                 11: -333 (0xfffffffffffffeb3)
                                 12: 0 (0x0)
                                 13: 333 (0x14d)
                                 14: 667 (0x29b)
                                 15: 1000 (0x3e8)
                                 16: 1333 (0x535)
                                 17: 1667 (0x683)
                                 18: 2000 (0x7d0)
                                 19: 2333 (0x91d)
                                 20: 2667 (0xa6b)
                                 21: 3000 (0xbb8)
                                 22: 3333 (0xd05)
                                 23: 3667 (0xe53)
                                 24: 4000 (0xfa0)
       white_balance_auto_preset 0x009a0914 (menu)   : min=0 max=10
 default=1 value=10
                                 0: Manual
                                 1: Auto
                                 2: Incandescent
                                 3: Fluorescent
                                 4: Fluorescent H
                                 5: Horizon
                                 6: Daylight
                                 7: Flash
                                 8: Cloudy
                                 9: Shade
                                 10: Greyworld
             image_stabilization 0x009a0916 (bool)   : default=0 value=0
                 iso_sensitivity 0x009a0917 (intmenu): min=0 max=4
 default=0 value=0
                                 0: 0 (0x0)
                                 1: 100000 (0x186a0)
                                 2: 200000 (0x30d40)
                                 3: 400000 (0x61a80)
                                 4: 800000 (0xc3500)
            iso_sensitivity_auto 0x009a0918 (menu)   : min=0 max=1
 default=1 value=1
                                 0: Manual
                                 1: Auto
          exposure_metering_mode 0x009a0919 (menu)   : min=0 max=2
 default=0 value=0
                                 0: Average
                                 1: Center Weighted
                                 2: Spot
                      scene_mode 0x009a091a (menu)   : min=0 max=13
 default=0 value=0
                                 0: None
                                 8: Night
                                 11: Sports

 JPEG Compression Controls

             compression_quality 0x009d0903 (int)    : min=1 max=100 step=1
 default=30 value=30
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/2305#comment:6>
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