Part I - Video for Linux API

This part describes the Video for Linux API version 2 (V4L2 API) specification.

Revision 4.5

Table of Contents

• 1. Common API Elements
  • 1.1. Opening and Closing Devices
    • 1.1.1. Device Naming
    • 1.1.2. Related Devices
    • 1.1.3. Multiple Opens
    • 1.1.4. Shared Data Streams
    • 1.1.5. Functions
  • 1.2. Querying Capabilities
  • 1.3. Application Priority
  • 1.4. Video Inputs and Outputs
    • 1.4.1. Example: Information about the current video input
    • 1.4.2. Example: Switching to the first video input
  • 1.5. Audio Inputs and Outputs
    • 1.5.1. Example: Information about the current audio input
    • 1.5.2. Example: Switching to the first audio input
  • 1.6. Tuners and Modulators
    • 1.6.1. Tuners
    • 1.6.2. Modulators
    • 1.6.3. Radio Frequency
  • 1.7. Video Standards
    • 1.7.1. Example: Information about the current video standard
    • 1.7.2. Example: Listing the video standards supported by the current input
    • 1.7.3. Example: Selecting a new video standard
  • 1.8. Digital Video (DV) Timings
  • 1.9. User Controls
    • 1.9.1. Control IDs
    • 1.9.2. Example: Enumerating all controls
    • 1.9.3. Example: Enumerating all controls including compound controls
    • 1.9.4. Example: Enumerating all user controls (old style)
    • 1.9.5. Example: Changing controls
  • 1.10. Extended Controls
    • 1.10.1. Introduction
    • 1.10.2. The Extended Control API
    • 1.10.3. Enumerating Extended Controls
    • 1.10.4. Creating Control Panels
    • 1.10.5. Codec Control Reference
      • 1.10.5.1. Generic Codec Controls
        • 1.10.5.1.1. Codec Control IDs
      • 1.10.5.2. MFC 5.1 MPEG Controls
        • 1.10.5.2.1. MFC 5.1 Control IDs
      • 1.10.5.3. CX2341x MPEG Controls
        • 1.10.5.3.1. CX2341x Control IDs
      • 1.10.5.4. VPX Control Reference
        • 1.10.5.4.1. VPX Control IDs
    • 1.10.6. Camera Control Reference
      • 1.10.6.1. Camera Control IDs
    • 1.10.7. FM Transmitter Control Reference
      • 1.10.7.1. FM_TX Control IDs
    • 1.10.8. Flash Control Reference
      • 1.10.8.1. Supported use cases
        • 1.10.8.1.1. Unsynchronised LED flash (software strobe)
        • 1.10.8.1.2. Synchronised LED flash (hardware strobe)
        • 1.10.8.1.3. LED flash as torch
    • 1.10.9. JPEG Control Reference
      • 1.10.9.1. JPEG Control IDs
    • 1.10.10. Image Source Control Reference
      • 1.10.10.1. Image Source Control IDs
    • 1.10.11. Image Process Control Reference
      • 1.10.11.1. Image Process Control IDs
    • 1.10.12. Digital Video Control Reference
      • 1.10.12.1. Digital Video Control IDs
    • 1.10.13. FM Receiver Control Reference
      • 1.10.13.1. FM_RX Control IDs
    • 1.10.14. Detect Control Reference
      • 1.10.14.1. Detect Control IDs
    • 1.10.15. RF Tuner Control Reference
      • 1.10.15.1. RF_TUNER Control IDs
  • 1.11. Data Formats
    • 1.11.1. Data Format Negotiation
    • 1.11.2. Image Format Enumeration
  • 1.12. Single- and multi-planar APIs
    • 1.12.1. Multi-planar formats
    • 1.12.2. Calls that distinguish between single and multi-planar APIs
  • 1.13. Image Cropping, Insertion and Scaling
    • 1.13.1. Cropping Structures
    • 1.13.2. Scaling Adjustments
    • 1.13.3. Examples
    • 1.13.4. Example: Resetting the cropping parameters
    • 1.13.5. Example: Simple downscaling
    • 1.13.6. Example: Selecting an output area
    • 1.13.7. Example: Current scaling factor and pixel aspect
  • 1.14. API for cropping, composing and scaling
    • 1.14.1. Introduction
    • 1.14.2. Selection targets
    • 1.14.3. Configuration
      • 1.14.3.1. Configuration of video capture
      • 1.14.3.2. Configuration of video output
      • 1.14.3.3. Scaling control
    • 1.14.4. Comparison with old cropping API
    • 1.14.5. Examples
      • 1.14.5.1. Example: Resetting the cropping parameters
      • 1.14.5.2. Example: Simple downscaling
      • 1.14.5.3. Example: Querying for scaling factors
  • 1.15. Streaming Parameters
• 2. Image Formats
  • 2.1. Single-planar format structure
  • 2.2. Multi-planar format structures
  • 2.3. Standard Image Formats
  • 2.4. Colorspaces
  • 2.5. Defining Colorspaces in V4L2
  • 2.6. Detailed Colorspace Descriptions
    • 2.6.1. Colorspace SMPTE 170M (V4L2_COLORSPACE_SMPTE170M)
    • 2.6.2. Colorspace Rec. 709 (V4L2_COLORSPACE_REC709)
    • 2.6.3. Colorspace sRGB (V4L2_COLORSPACE_SRGB)
    • 2.6.4. Colorspace Adobe RGB (V4L2_COLORSPACE_ADOBERGB)
    • 2.6.5. Colorspace BT.2020 (V4L2_COLORSPACE_BT2020)
    • 2.6.6. Colorspace DCI-P3 (V4L2_COLORSPACE_DCI_P3)
    • 2.6.7. Colorspace SMPTE 240M (V4L2_COLORSPACE_SMPTE240M)
    • 2.6.8. Colorspace NTSC 1953 (V4L2_COLORSPACE_470_SYSTEM_M)
    • 2.6.9. Colorspace EBU Tech. 3213 (V4L2_COLORSPACE_470_SYSTEM_BG)
    • 2.6.10. Colorspace JPEG (V4L2_COLORSPACE_JPEG)
  • 2.7. Detailed Transfer Function Descriptions
    • 2.7.1. Transfer Function SMPTE 2084 (V4L2_XFER_FUNC_SMPTE2084)
  • 2.8. Indexed Format
  • 2.9. RGB Formats
    • 2.9.1. Packed RGB formats
      • 2.9.1.1. Description
    • 2.9.2. V4L2_PIX_FMT_SRGGB8 (‘RGGB’), V4L2_PIX_FMT_SGRBG8 (‘GRBG’), V4L2_PIX_FMT_SGBRG8 (‘GBRG’), V4L2_PIX_FMT_SBGGR8 (‘BA81’),
      • 2.9.2.1. Description
    • 2.9.3. V4L2_PIX_FMT_SRGGB10 (‘RG10’), V4L2_PIX_FMT_SGRBG10 (‘BA10’), V4L2_PIX_FMT_SGBRG10 (‘GB10’), V4L2_PIX_FMT_SBGGR10 (‘BG10’),
      • 2.9.3.1. Description
    • 2.9.4. V4L2_PIX_FMT_SRGGB10P (‘pRAA’), V4L2_PIX_FMT_SGRBG10P (‘pgAA’), V4L2_PIX_FMT_SGBRG10P (‘pGAA’), V4L2_PIX_FMT_SBGGR10P (‘pBAA’),
      • 2.9.4.1. Description
    • 2.9.5. V4L2_PIX_FMT_SBGGR10ALAW8 (‘aBA8’), V4L2_PIX_FMT_SGBRG10ALAW8 (‘aGA8’), V4L2_PIX_FMT_SGRBG10ALAW8 (‘agA8’), V4L2_PIX_FMT_SRGGB10ALAW8 (‘aRA8’),
      • 2.9.5.1. Description
    • 2.9.6. V4L2_PIX_FMT_SBGGR10DPCM8 (‘bBA8’), V4L2_PIX_FMT_SGBRG10DPCM8 (‘bGA8’), V4L2_PIX_FMT_SGRBG10DPCM8 (‘BD10’), V4L2_PIX_FMT_SRGGB10DPCM8 (‘bRA8’),
      • 2.9.6.1. Description
    • 2.9.7. V4L2_PIX_FMT_SRGGB12 (‘RG12’), V4L2_PIX_FMT_SGRBG12 (‘BA12’), V4L2_PIX_FMT_SGBRG12 (‘GB12’), V4L2_PIX_FMT_SBGGR12 (‘BG12’),
      • 2.9.7.1. Description
    • 2.9.8. V4L2_PIX_FMT_SRGGB16 (‘RG16’), V4L2_PIX_FMT_SGRBG16 (‘GR16’), V4L2_PIX_FMT_SGBRG16 (‘GB16’), V4L2_PIX_FMT_SBGGR16 (‘BYR2’),
      • 2.9.8.1. Description
  • 2.10. YUV Formats
    • 2.10.1. Packed YUV formats
      • 2.10.1.1. Description
    • 2.10.2. V4L2_PIX_FMT_GREY (‘GREY’)
      • 2.10.2.1. Description
    • 2.10.3. V4L2_PIX_FMT_Y10 (‘Y10 ‘)
      • 2.10.3.1. Description
    • 2.10.4. V4L2_PIX_FMT_Y12 (‘Y12 ‘)
      • 2.10.4.1. Description
    • 2.10.5. V4L2_PIX_FMT_Y10BPACK (‘Y10B’)
      • 2.10.5.1. Description
    • 2.10.6. V4L2_PIX_FMT_Y16 (‘Y16 ‘)
      • 2.10.6.1. Description
    • 2.10.7. V4L2_PIX_FMT_Y16_BE (‘Y16 ‘ | (1 << 31))
      • 2.10.7.1. Description
    • 2.10.8. V4L2_PIX_FMT_Y8I (‘Y8I ‘)
      • 2.10.8.1. Description
    • 2.10.9. V4L2_PIX_FMT_Y12I (‘Y12I’)
      • 2.10.9.1. Description
    • 2.10.10. V4L2_PIX_FMT_UV8 (‘UV8’)
      • 2.10.10.1. Description
    • 2.10.11. V4L2_PIX_FMT_YUYV (‘YUYV’)
      • 2.10.11.1. Description
    • 2.10.12. V4L2_PIX_FMT_UYVY (‘UYVY’)
      • 2.10.12.1. Description
    • 2.10.13. V4L2_PIX_FMT_YVYU (‘YVYU’)
      • 2.10.13.1. Description
    • 2.10.14. V4L2_PIX_FMT_VYUY (‘VYUY’)
      • 2.10.14.1. Description
    • 2.10.15. V4L2_PIX_FMT_Y41P (‘Y41P’)
      • 2.10.15.1. Description
    • 2.10.16. V4L2_PIX_FMT_YVU420 (‘YV12’), V4L2_PIX_FMT_YUV420 (‘YU12’)
      • 2.10.16.1. Description
    • 2.10.17. V4L2_PIX_FMT_YUV420M (‘YM12’), V4L2_PIX_FMT_YVU420M (‘YM21’)
      • 2.10.17.1. Description
    • 2.10.18. V4L2_PIX_FMT_YUV422M (‘YM16’), V4L2_PIX_FMT_YVU422M (‘YM61’)
      • 2.10.18.1. Description
    • 2.10.19. V4L2_PIX_FMT_YUV444M (‘YM24’), V4L2_PIX_FMT_YVU444M (‘YM42’)
      • 2.10.19.1. Description
    • 2.10.20. V4L2_PIX_FMT_YVU410 (‘YVU9’), V4L2_PIX_FMT_YUV410 (‘YUV9’)
      • 2.10.20.1. Description
    • 2.10.21. V4L2_PIX_FMT_YUV422P (‘422P’)
      • 2.10.21.1. Description
    • 2.10.22. V4L2_PIX_FMT_YUV411P (‘411P’)
      • 2.10.22.1. Description
    • 2.10.23. V4L2_PIX_FMT_NV12 (‘NV12’), V4L2_PIX_FMT_NV21 (‘NV21’)
      • 2.10.23.1. Description
    • 2.10.24. V4L2_PIX_FMT_NV12M (‘NM12’), V4L2_PIX_FMT_NV21M (‘NM21’), V4L2_PIX_FMT_NV12MT_16X16
      • 2.10.24.1. Description
    • 2.10.25. V4L2_PIX_FMT_NV12MT (‘TM12’)
      • 2.10.25.1. Description
    • 2.10.26. V4L2_PIX_FMT_NV16 (‘NV16’), V4L2_PIX_FMT_NV61 (‘NV61’)
      • 2.10.26.1. Description
    • 2.10.27. V4L2_PIX_FMT_NV16M (‘NM16’), V4L2_PIX_FMT_NV61M (‘NM61’)
      • 2.10.27.1. Description
    • 2.10.28. V4L2_PIX_FMT_NV24 (‘NV24’), V4L2_PIX_FMT_NV42 (‘NV42’)
      • 2.10.28.1. Description
    • 2.10.29. V4L2_PIX_FMT_M420 (‘M420’)
      • 2.10.29.1. Description
  • 2.11. HSV Formats
    • 2.11.1. Packed HSV formats
      • 2.11.1.1. Description
  • 2.12. Depth Formats
    • 2.12.1. V4L2_PIX_FMT_Z16 (‘Z16 ‘)
      • 2.12.1.1. Description
  • 2.13. Compressed Formats
  • 2.14. SDR Formats
    • 2.14.1. V4L2_SDR_FMT_CU8 (‘CU08’)
      • 2.14.1.1. Description
    • 2.14.2. V4L2_SDR_FMT_CU16LE (‘CU16’)
      • 2.14.2.1. Description
    • 2.14.3. V4L2_SDR_FMT_CS8 (‘CS08’)
      • 2.14.3.1. Description
    • 2.14.4. V4L2_SDR_FMT_CS14LE (‘CS14’)
      • 2.14.4.1. Description
    • 2.14.5. V4L2_SDR_FMT_RU12LE (‘RU12’)
      • 2.14.5.1. Description
  • 2.15. Touch Formats
    • 2.15.1. V4L2_TCH_FMT_DELTA_TD16 (‘TD16’)
      • 2.15.1.1. Description
    • 2.15.2. V4L2_TCH_FMT_DELTA_TD08 (‘TD08’)
      • 2.15.2.1. Description
    • 2.15.3. V4L2_TCH_FMT_TU16 (‘TU16’)
      • 2.15.3.1. Description
    • 2.15.4. V4L2_TCH_FMT_TU08 (‘TU08’)
      • 2.15.4.1. Description
  • 2.16. Reserved Format Identifiers
• 3. Input/Output
  • 3.1. Read/Write
  • 3.2. Streaming I/O (Memory Mapping)
    • 3.2.1. Example: Mapping buffers in the single-planar API
    • 3.2.2. Example: Mapping buffers in the multi-planar API
  • 3.3. Streaming I/O (User Pointers)
    • 3.3.1. Example: Initiating streaming I/O with user pointers
  • 3.4. Streaming I/O (DMA buffer importing)
    • 3.4.1. Example: Initiating streaming I/O with DMABUF file descriptors
    • 3.4.2. Example: Queueing DMABUF using single plane API
    • 3.4.3. Example 3.6. Queueing DMABUF using multi plane API
  • 3.5. Asynchronous I/O
  • 3.6. Buffers
    • 3.6.1. struct v4l2_buffer
    • 3.6.2. struct v4l2_plane
    • 3.6.3. enum v4l2_buf_type
    • 3.6.4. Buffer Flags
    • 3.6.5. enum v4l2_memory
    • 3.6.6. Timecodes
      • 3.6.6.1. struct v4l2_timecode
      • 3.6.6.2. Timecode Types
      • 3.6.6.3. Timecode Flags
  • 3.7. Field Order
    • 3.7.1. enum v4l2_field
    • 3.7.2. Field Order, Top Field First Transmitted
    • 3.7.3. Field Order, Bottom Field First Transmitted
• 4. Interfaces
  • 4.1. Video Capture Interface
    • 4.1.1. Querying Capabilities
    • 4.1.2. Supplemental Functions
    • 4.1.3. Image Format Negotiation
    • 4.1.4. Reading Images
  • 4.2. Video Overlay Interface
    • 4.2.1. Querying Capabilities
    • 4.2.2. Supplemental Functions
    • 4.2.3. Setup
    • 4.2.4. Overlay Window
      • 4.2.4.1. struct v4l2_window
      • 4.2.4.2. struct v4l2_clip
      • 4.2.4.3. struct v4l2_rect
    • 4.2.5. Enabling Overlay
  • 4.3. Video Output Interface
    • 4.3.1. Querying Capabilities
    • 4.3.2. Supplemental Functions
    • 4.3.3. Image Format Negotiation
    • 4.3.4. Writing Images
  • 4.4. Video Output Overlay Interface
    • 4.4.1. Querying Capabilities
    • 4.4.2. Framebuffer
      • 4.4.2.1. Example: Finding a framebuffer device for OSD
    • 4.4.3. Overlay Window and Scaling
    • 4.4.4. Enabling Overlay
  • 4.5. Codec Interface
  • 4.6. Effect Devices Interface
  • 4.7. Raw VBI Data Interface
    • 4.7.1. Querying Capabilities
    • 4.7.2. Supplemental Functions
    • 4.7.3. Raw VBI Format Negotiation
    • 4.7.4. Reading and writing VBI images
  • 4.8. Sliced VBI Data Interface
    • 4.8.1. Querying Capabilities
    • 4.8.2. Supplemental Functions
    • 4.8.3. Sliced VBI Format Negotiation
      • 4.8.3.1. struct v4l2_sliced_vbi_format
      • 4.8.3.2. Sliced VBI services
    • 4.8.4. Reading and writing sliced VBI data
      • 4.8.4.1. struct v4l2_sliced_vbi_data
    • 4.8.5. Sliced VBI Data in MPEG Streams
      • 4.8.5.1. MPEG Stream Embedded, Sliced VBI Data Format: NONE
      • 4.8.5.2. MPEG Stream Embedded, Sliced VBI Data Format: IVTV
      • 4.8.5.3. struct v4l2_mpeg_vbi_fmt_ivtv
      • 4.8.5.4. Magic Constants for struct v4l2_mpeg_vbi_fmt_ivtv magic field
      • 4.8.5.5. structs v4l2_mpeg_vbi_itv0 and v4l2_mpeg_vbi_ITV0
      • 4.8.5.6. struct v4l2_mpeg_vbi_ITV0
      • 4.8.5.7. struct v4l2_mpeg_vbi_itv0_line
      • 4.8.5.8. Line Identifiers for struct v4l2_mpeg_vbi_itv0_line id field
  • 4.9. Teletext Interface
  • 4.10. Radio Interface
    • 4.10.1. Querying Capabilities
    • 4.10.2. Supplemental Functions
    • 4.10.3. Programming
  • 4.11. RDS Interface
    • 4.11.1. Querying Capabilities
    • 4.11.2. Reading RDS data
    • 4.11.3. Writing RDS data
    • 4.11.4. RDS datastructures
  • 4.12. Software Defined Radio Interface (SDR)
    • 4.12.1. Querying Capabilities
    • 4.12.2. Supplemental Functions
    • 4.12.3. Data Format Negotiation
  • 4.13. Touch Devices
    • 4.13.1. Overview
    • 4.13.2. Querying Capabilities
    • 4.13.3. Data Format Negotiation
  • 4.14. Event Interface
  • 4.15. Sub-device Interface
    • 4.15.1. Controls
    • 4.15.2. Events
    • 4.15.3. Pad-level Formats
      • 4.15.3.1. Format Negotiation
      • 4.15.3.2. Selections: cropping, scaling and composition
      • 4.15.3.3. Types of selection targets
        • 4.15.3.3.1. Actual targets
        • 4.15.3.3.2. BOUNDS targets
      • 4.15.3.4. Order of configuration and format propagation
        • 4.15.3.4.1. Media Bus Formats
• 5. V4L2 Driver Programming
• 6. Libv4l Userspace Library
  • 6.1. Introduction
    • 6.1.1. libv4lconvert
    • 6.1.2. libv4l1
    • 6.1.3. libv4l2
      • 6.1.3.1. Libv4l device control functions
    • 6.1.4. v4l1compat.so wrapper library
• 7. Changes
  • 7.1. Differences between V4L and V4L2
    • 7.1.1. Opening and Closing Devices
    • 7.1.2. Querying Capabilities
    • 7.1.3. Video Sources
    • 7.1.4. Tuning
    • 7.1.5. Image Properties
    • 7.1.6. Audio
    • 7.1.7. Frame Buffer Overlay
    • 7.1.8. Cropping
    • 7.1.9. Reading Images, Memory Mapping
      • 7.1.9.1. Capturing using the read method
      • 7.1.9.2. Capturing using memory mapping
    • 7.1.10. Reading Raw VBI Data
    • 7.1.11. Miscellaneous
  • 7.2. Changes of the V4L2 API
    • 7.2.1. Early Versions
    • 7.2.2. V4L2 Version 0.16 1999-01-31
    • 7.2.3. V4L2 Version 0.18 1999-03-16
    • 7.2.4. V4L2 Version 0.19 1999-06-05
    • 7.2.5. V4L2 Version 0.20 (1999-09-10)
    • 7.2.6. V4L2 Version 0.20 incremental changes
    • 7.2.7. V4L2 Version 0.20 2000-11-23
    • 7.2.8. V4L2 Version 0.20 2002-07-25
    • 7.2.9. V4L2 in Linux 2.5.46, 2002-10
    • 7.2.10. V4L2 2003-06-19
    • 7.2.11. V4L2 2003-11-05
    • 7.2.12. V4L2 in Linux 2.6.6, 2004-05-09
    • 7.2.13. V4L2 in Linux 2.6.8
    • 7.2.14. V4L2 spec erratum 2004-08-01
    • 7.2.15. V4L2 in Linux 2.6.14
    • 7.2.16. V4L2 in Linux 2.6.15
    • 7.2.17. V4L2 spec erratum 2005-11-27
    • 7.2.18. V4L2 spec erratum 2006-01-10
    • 7.2.19. V4L2 spec erratum 2006-02-03
    • 7.2.20. V4L2 spec erratum 2006-02-04
    • 7.2.21. V4L2 in Linux 2.6.17
    • 7.2.22. V4L2 spec erratum 2006-09-23 (Draft 0.15)
    • 7.2.23. V4L2 in Linux 2.6.18
    • 7.2.24. V4L2 in Linux 2.6.19
    • 7.2.25. V4L2 spec erratum 2006-10-12 (Draft 0.17)
    • 7.2.26. V4L2 in Linux 2.6.21
    • 7.2.27. V4L2 in Linux 2.6.22
    • 7.2.28. V4L2 in Linux 2.6.24
    • 7.2.29. V4L2 in Linux 2.6.25
    • 7.2.30. V4L2 in Linux 2.6.26
    • 7.2.31. V4L2 in Linux 2.6.27
    • 7.2.32. V4L2 in Linux 2.6.28
    • 7.2.33. V4L2 in Linux 2.6.29
    • 7.2.34. V4L2 in Linux 2.6.30
    • 7.2.35. V4L2 in Linux 2.6.32
    • 7.2.36. V4L2 in Linux 2.6.33
    • 7.2.37. V4L2 in Linux 2.6.34
    • 7.2.38. V4L2 in Linux 2.6.37
    • 7.2.39. V4L2 in Linux 2.6.39
    • 7.2.40. V4L2 in Linux 3.1
    • 7.2.41. V4L2 in Linux 3.2
    • 7.2.42. V4L2 in Linux 3.3
    • 7.2.43. V4L2 in Linux 3.4
    • 7.2.44. V4L2 in Linux 3.5
    • 7.2.45. V4L2 in Linux 3.6
    • 7.2.46. V4L2 in Linux 3.9
    • 7.2.47. V4L2 in Linux 3.10
    • 7.2.48. V4L2 in Linux 3.11
    • 7.2.49. V4L2 in Linux 3.14
    • 7.2.50. V4L2 in Linux 3.15
    • 7.2.51. V4L2 in Linux 3.16
    • 7.2.52. V4L2 in Linux 3.17
    • 7.2.53. V4L2 in Linux 3.18
    • 7.2.54. V4L2 in Linux 3.19
    • 7.2.55. V4L2 in Linux 4.4
    • 7.2.56. Relation of V4L2 to other Linux multimedia APIs
      • 7.2.56.1. X Video Extension
      • 7.2.56.2. Digital Video
      • 7.2.56.3. Audio Interfaces
    • 7.2.57. Experimental API Elements
    • 7.2.58. Obsolete API Elements
• 8. Function Reference
  • 8.1. V4L2 close()
    • 8.1.1. Name
    • 8.1.2. Synopsis
    • 8.1.3. Arguments
    • 8.1.4. Description
    • 8.1.5. Return Value
  • 8.2. V4L2 ioctl()
    • 8.2.1. Name
    • 8.2.2. Synopsis
    • 8.2.3. Arguments
    • 8.2.4. Description
    • 8.2.5. Return Value
  • 8.3. ioctl VIDIOC_CREATE_BUFS
    • 8.3.1. Name
    • 8.3.2. Synopsis
    • 8.3.3. Arguments
    • 8.3.4. Description
    • 8.3.5. Return Value
  • 8.4. ioctl VIDIOC_CROPCAP
    • 8.4.1. Name
    • 8.4.2. Synopsis
    • 8.4.3. Arguments
    • 8.4.4. Description
    • 8.4.5. Return Value
  • 8.5. ioctl VIDIOC_DBG_G_CHIP_INFO
    • 8.5.1. Name
    • 8.5.2. Synopsis
    • 8.5.3. Arguments
    • 8.5.4. Description
    • 8.5.5. Return Value
  • 8.6. ioctl VIDIOC_DBG_G_REGISTER, VIDIOC_DBG_S_REGISTER
    • 8.6.1. Name
    • 8.6.2. Synopsis
    • 8.6.3. Arguments
    • 8.6.4. Description
    • 8.6.5. Return Value
  • 8.7. ioctl VIDIOC_DECODER_CMD, VIDIOC_TRY_DECODER_CMD
    • 8.7.1. Name
    • 8.7.2. Synopsis
    • 8.7.3. Arguments
    • 8.7.4. Description
    • 8.7.5. Return Value
  • 8.8. ioctl VIDIOC_DQEVENT
    • 8.8.1. Name
    • 8.8.2. Synopsis
    • 8.8.3. Arguments
    • 8.8.4. Description
    • 8.8.5. Return Value
  • 8.9. ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP
    • 8.9.1. Name
    • 8.9.2. Synopsis
    • 8.9.3. Arguments
    • 8.9.4. Description
    • 8.9.5. Return Value
  • 8.10. ioctl VIDIOC_ENCODER_CMD, VIDIOC_TRY_ENCODER_CMD
    • 8.10.1. Name
    • 8.10.2. Synopsis
    • 8.10.3. Arguments
    • 8.10.4. Description
    • 8.10.5. Return Value
  • 8.11. ioctl VIDIOC_ENUMAUDIO
    • 8.11.1. Name
    • 8.11.2. Synopsis
    • 8.11.3. Arguments
    • 8.11.4. Description
    • 8.11.5. Return Value
  • 8.12. ioctl VIDIOC_ENUMAUDOUT
    • 8.12.1. Name
    • 8.12.2. Synopsis
    • 8.12.3. Arguments
    • 8.12.4. Description
    • 8.12.5. Return Value
  • 8.13. ioctl VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS
    • 8.13.1. Name
    • 8.13.2. Synopsis
    • 8.13.3. Arguments
    • 8.13.4. Description
    • 8.13.5. Return Value
  • 8.14. ioctl VIDIOC_ENUM_FMT
    • 8.14.1. Name
    • 8.14.2. Synopsis
    • 8.14.3. Arguments
    • 8.14.4. Description
    • 8.14.5. Return Value
  • 8.15. ioctl VIDIOC_ENUM_FRAMESIZES
    • 8.15.1. Name
    • 8.15.2. Synopsis
    • 8.15.3. Arguments
    • 8.15.4. Description
    • 8.15.5. Structs
    • 8.15.6. Enums
    • 8.15.7. Return Value
  • 8.16. ioctl VIDIOC_ENUM_FRAMEINTERVALS
    • 8.16.1. Name
    • 8.16.2. Synopsis
    • 8.16.3. Arguments
    • 8.16.4. Description
    • 8.16.5. Structs
    • 8.16.6. Enums
    • 8.16.7. Return Value
  • 8.17. ioctl VIDIOC_ENUM_FREQ_BANDS
    • 8.17.1. Name
    • 8.17.2. Synopsis
    • 8.17.3. Arguments
    • 8.17.4. Description
    • 8.17.5. Return Value
  • 8.18. ioctl VIDIOC_ENUMINPUT
    • 8.18.1. Name
    • 8.18.2. Synopsis
    • 8.18.3. Arguments
    • 8.18.4. Description
    • 8.18.5. Return Value
  • 8.19. ioctl VIDIOC_ENUMOUTPUT
    • 8.19.1. Name
    • 8.19.2. Synopsis
    • 8.19.3. Arguments
    • 8.19.4. Description
    • 8.19.5. Return Value
  • 8.20. ioctl VIDIOC_ENUMSTD
    • 8.20.1. Name
    • 8.20.2. Synopsis
    • 8.20.3. Arguments
    • 8.20.4. Description
    • 8.20.5. Return Value
  • 8.21. ioctl VIDIOC_EXPBUF
    • 8.21.1. Name
    • 8.21.2. Synopsis
    • 8.21.3. Arguments
    • 8.21.4. Description
    • 8.21.5. Examples
    • 8.21.6. Return Value
  • 8.22. ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO
    • 8.22.1. Name
    • 8.22.2. Synopsis
    • 8.22.3. Arguments
    • 8.22.4. Description
    • 8.22.5. Return Value
  • 8.23. ioctl VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT
    • 8.23.1. Name
    • 8.23.2. Synopsis
    • 8.23.3. Arguments
    • 8.23.4. Description
    • 8.23.5. Return Value
  • 8.24. ioctl VIDIOC_G_CROP, VIDIOC_S_CROP
    • 8.24.1. Name
    • 8.24.2. Synopsis
    • 8.24.3. Arguments
    • 8.24.4. Description
    • 8.24.5. Return Value
  • 8.25. ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL
    • 8.25.1. Name
    • 8.25.2. Synopsis
    • 8.25.3. Arguments
    • 8.25.4. Description
    • 8.25.5. Return Value
  • 8.26. ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS
    • 8.26.1. Name
    • 8.26.2. Synopsis
    • 8.26.3. Arguments
    • 8.26.4. Description
    • 8.26.5. Return Value
  • 8.27. ioctl VIDIOC_G_EDID, VIDIOC_S_EDID, VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_S_EDID
    • 8.27.1. Name
    • 8.27.2. Synopsis
    • 8.27.3. Arguments
    • 8.27.4. Description
    • 8.27.5. Return Value
  • 8.28. ioctl VIDIOC_G_ENC_INDEX
    • 8.28.1. Name
    • 8.28.2. Synopsis
    • 8.28.3. Arguments
    • 8.28.4. Description
    • 8.28.5. Return Value
  • 8.29. ioctl VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, VIDIOC_TRY_EXT_CTRLS
    • 8.29.1. Name
    • 8.29.2. Synopsis
    • 8.29.3. Arguments
    • 8.29.4. Description
    • 8.29.5. Return Value
  • 8.30. ioctl VIDIOC_G_FBUF, VIDIOC_S_FBUF
    • 8.30.1. Name
    • 8.30.2. Synopsis
    • 8.30.3. Arguments
    • 8.30.4. Description
    • 8.30.5. Return Value
  • 8.31. ioctl VIDIOC_G_FMT, VIDIOC_S_FMT, VIDIOC_TRY_FMT
    • 8.31.1. Name
    • 8.31.2. Synopsis
    • 8.31.3. Arguments
    • 8.31.4. Description
    • 8.31.5. Return Value
  • 8.32. ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY
    • 8.32.1. Name
    • 8.32.2. Synopsis
    • 8.32.3. Arguments
    • 8.32.4. Description
    • 8.32.5. Return Value
  • 8.33. ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT
    • 8.33.1. Name
    • 8.33.2. Synopsis
    • 8.33.3. Arguments
    • 8.33.4. Description
    • 8.33.5. Return Value
  • 8.34. ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP
    • 8.34.1. Name
    • 8.34.2. Synopsis
    • 8.34.3. Arguments
    • 8.34.4. Description
    • 8.34.5. Return Value
  • 8.35. ioctl VIDIOC_G_MODULATOR, VIDIOC_S_MODULATOR
    • 8.35.1. Name
    • 8.35.2. Synopsis
    • 8.35.3. Arguments
    • 8.35.4. Description
    • 8.35.5. Return Value
  • 8.36. ioctl VIDIOC_G_OUTPUT, VIDIOC_S_OUTPUT
    • 8.36.1. Name
    • 8.36.2. Synopsis
    • 8.36.3. Arguments
    • 8.36.4. Description
    • 8.36.5. Return Value
  • 8.37. ioctl VIDIOC_G_PARM, VIDIOC_S_PARM
    • 8.37.1. Name
    • 8.37.2. Synopsis
    • 8.37.3. Arguments
    • 8.37.4. Description
    • 8.37.5. Return Value
  • 8.38. ioctl VIDIOC_G_PRIORITY, VIDIOC_S_PRIORITY
    • 8.38.1. Name
    • 8.38.2. Synopsis
    • 8.38.3. Arguments
    • 8.38.4. Description
    • 8.38.5. Return Value
  • 8.39. ioctl VIDIOC_G_SELECTION, VIDIOC_S_SELECTION
    • 8.39.1. Name
    • 8.39.2. Synopsis
    • 8.39.3. Arguments
    • 8.39.4. Description
    • 8.39.5. Return Value
  • 8.40. ioctl VIDIOC_G_SLICED_VBI_CAP
    • 8.40.1. Name
    • 8.40.2. Synopsis
    • 8.40.3. Arguments
    • 8.40.4. Description
    • 8.40.5. Return Value
  • 8.41. ioctl VIDIOC_G_STD, VIDIOC_S_STD
    • 8.41.1. Name
    • 8.41.2. Synopsis
    • 8.41.3. Arguments
    • 8.41.4. Description
    • 8.41.5. Return Value
  • 8.42. ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER
    • 8.42.1. Name
    • 8.42.2. Synopsis
    • 8.42.3. Arguments
    • 8.42.4. Description
    • 8.42.5. Return Value
  • 8.43. ioctl VIDIOC_LOG_STATUS
    • 8.43.1. Name
    • 8.43.2. Synopsis
    • 8.43.3. Arguments
    • 8.43.4. Description
    • 8.43.5. Return Value
  • 8.44. ioctl VIDIOC_OVERLAY
    • 8.44.1. Name
    • 8.44.2. Synopsis
    • 8.44.3. Arguments
    • 8.44.4. Description
    • 8.44.5. Return Value
  • 8.45. ioctl VIDIOC_PREPARE_BUF
    • 8.45.1. Name
    • 8.45.2. Synopsis
    • 8.45.3. Arguments
    • 8.45.4. Description
    • 8.45.5. Return Value
  • 8.46. ioctl VIDIOC_QBUF, VIDIOC_DQBUF
    • 8.46.1. Name
    • 8.46.2. Synopsis
    • 8.46.3. Arguments
    • 8.46.4. Description
    • 8.46.5. Return Value
  • 8.47. ioctl VIDIOC_QUERYBUF
    • 8.47.1. Name
    • 8.47.2. Synopsis
    • 8.47.3. Arguments
    • 8.47.4. Description
    • 8.47.5. Return Value
  • 8.48. ioctl VIDIOC_QUERYCAP
    • 8.48.1. Name
    • 8.48.2. Synopsis
    • 8.48.3. Arguments
    • 8.48.4. Description
    • 8.48.5. Return Value
  • 8.49. ioctls VIDIOC_QUERYCTRL, VIDIOC_QUERY_EXT_CTRL and VIDIOC_QUERYMENU
    • 8.49.1. Name
    • 8.49.2. Synopsis
    • 8.49.3. Arguments
    • 8.49.4. Description
    • 8.49.5. Return Value
  • 8.50. ioctl VIDIOC_QUERY_DV_TIMINGS
    • 8.50.1. Name
    • 8.50.2. Synopsis
    • 8.50.3. Arguments
    • 8.50.4. Description
    • 8.50.5. Return Value
  • 8.51. ioctl VIDIOC_QUERYSTD
    • 8.51.1. Name
    • 8.51.2. Synopsis
    • 8.51.3. Arguments
    • 8.51.4. Description
    • 8.51.5. Return Value
  • 8.52. ioctl VIDIOC_REQBUFS
    • 8.52.1. Name
    • 8.52.2. Synopsis
    • 8.52.3. Arguments
    • 8.52.4. Description
    • 8.52.5. Return Value
  • 8.53. ioctl VIDIOC_S_HW_FREQ_SEEK
    • 8.53.1. Name
    • 8.53.2. Synopsis
    • 8.53.3. Arguments
    • 8.53.4. Description
    • 8.53.5. Return Value
  • 8.54. ioctl VIDIOC_STREAMON, VIDIOC_STREAMOFF
    • 8.54.1. Name
    • 8.54.2. Synopsis
    • 8.54.3. Arguments
    • 8.54.4. Description
    • 8.54.5. Return Value
  • 8.55. ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL
    • 8.55.1. Name
    • 8.55.2. Synopsis
    • 8.55.3. Arguments
    • 8.55.4. Description
    • 8.55.5. Return Value
  • 8.56. ioctl VIDIOC_SUBDEV_ENUM_FRAME_SIZE
    • 8.56.1. Name
    • 8.56.2. Synopsis
    • 8.56.3. Arguments
    • 8.56.4. Description
    • 8.56.5. Return Value
  • 8.57. ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE
    • 8.57.1. Name
    • 8.57.2. Synopsis
    • 8.57.3. Arguments
    • 8.57.4. Description
    • 8.57.5. Return Value
  • 8.58. ioctl VIDIOC_SUBDEV_G_CROP, VIDIOC_SUBDEV_S_CROP
    • 8.58.1. Name
    • 8.58.2. Synopsis
    • 8.58.3. Arguments
    • 8.58.4. Description
    • 8.58.5. Return Value
  • 8.59. ioctl VIDIOC_SUBDEV_G_FMT, VIDIOC_SUBDEV_S_FMT
    • 8.59.1. Name
    • 8.59.2. Synopsis
    • 8.59.3. Arguments
    • 8.59.4. Description
    • 8.59.5. Return Value
  • 8.60. ioctl VIDIOC_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL
    • 8.60.1. Name
    • 8.60.2. Synopsis
    • 8.60.3. Arguments
    • 8.60.4. Description
    • 8.60.5. Return Value
  • 8.61. ioctl VIDIOC_SUBDEV_G_SELECTION, VIDIOC_SUBDEV_S_SELECTION
    • 8.61.1. Name
    • 8.61.2. Synopsis
    • 8.61.3. Arguments
    • 8.61.4. Description
      • 8.61.4.1. Types of selection targets
      • 8.61.4.2. Discovering supported features
    • 8.61.5. Return Value
  • 8.62. ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT
    • 8.62.1. Name
    • 8.62.2. Synopsis
    • 8.62.3. Arguments
    • 8.62.4. Description
    • 8.62.5. Return Value
  • 8.63. V4L2 mmap()
    • 8.63.1. Name
    • 8.63.2. Synopsis
    • 8.63.3. Arguments
    • 8.63.4. Description
    • 8.63.5. Return Value
  • 8.64. V4L2 munmap()
    • 8.64.1. Name
    • 8.64.2. Synopsis
    • 8.64.3. Arguments
    • 8.64.4. Description
    • 8.64.5. Return Value
  • 8.65. V4L2 open()
    • 8.65.1. Name
    • 8.65.2. Synopsis
    • 8.65.3. Arguments
    • 8.65.4. Description
    • 8.65.5. Return Value
  • 8.66. V4L2 poll()
    • 8.66.1. Name
    • 8.66.2. Synopsis
    • 8.66.3. Arguments
    • 8.66.4. Description
    • 8.66.5. Return Value
  • 8.67. V4L2 read()
    • 8.67.1. Name
    • 8.67.2. Synopsis
    • 8.67.3. Arguments
    • 8.67.4. Description
    • 8.67.5. Return Value
  • 8.68. V4L2 select()
    • 8.68.1. Name
    • 8.68.2. Synopsis
    • 8.68.3. Arguments
    • 8.68.4. Description
    • 8.68.5. Return Value
  • 8.69. V4L2 write()
    • 8.69.1. Name
    • 8.69.2. Synopsis
    • 8.69.3. Arguments
    • 8.69.4. Description
    • 8.69.5. Return Value
• 9. Common definitions for V4L2 and V4L2 subdev interfaces
  • 9.1. Common selection definitions
    • 9.1.1. Selection targets
    • 9.1.2. Selection flags
• 10. Video For Linux Two Header File
  • 10.1. videodev2.h
• 11. Video Capture Example
  • 11.1. file: media/v4l/capture.c
• 12. Video Grabber example using libv4l
  • 12.1. file: media/v4l/v4l2grab.c
• 13. References
  • 13.1. CEA 608-E
  • 13.2. EN 300 294
  • 13.3. ETS 300 231
  • 13.4. ETS 300 706
  • 13.5. ISO 13818-1
  • 13.6. ISO 13818-2
  • 13.7. ITU BT.470
  • 13.8. ITU BT.601
  • 13.9. ITU BT.653
  • 13.10. ITU BT.709
  • 13.11. ITU BT.1119
  • 13.12. JFIF
  • 13.13. ITU-T.81
  • 13.14. W3C JPEG JFIF
  • 13.15. SMPTE 12M
  • 13.16. SMPTE 170M
  • 13.17. SMPTE 240M
  • 13.18. SMPTE RP 431-2
  • 13.19. SMPTE ST 2084
  • 13.20. sRGB
  • 13.21. sYCC
  • 13.22. xvYCC
  • 13.23. AdobeRGB
  • 13.24. opRGB
  • 13.25. ITU BT.2020
  • 13.26. EBU Tech 3213
  • 13.27. IEC 62106
  • 13.28. NRSC-4-B
  • 13.29. ISO 12232:2006
  • 13.30. CEA-861-E
  • 13.31. VESA DMT
  • 13.32. EDID
  • 13.33. HDCP
  • 13.34. HDMI
  • 13.35. HDMI2
  • 13.36. DP
  • 13.37. poynton
  • 13.38. colimg

Revision and Copyright

Authors, in alphabetical order:

• Ailus, Sakari <sakari.ailus@iki.fi>
  • Subdev selections API.
• Carvalho Chehab, Mauro <m.chehab@kernel.org>
  • Documented libv4l, designed and added v4l2grab example, Remote Controller chapter.
• Dirks, Bill
  • Original author of the V4L2 API and documentation.
• H Schimek, Michael <mschimek@gmx.at>
  • Original author of the V4L2 API and documentation.
• Karicheri, Muralidharan <m-karicheri2@ti.com>
  • Documented the Digital Video timings API.
• Osciak, Pawel <pawel@osciak.com>
  • Designed and documented the multi-planar API.
• Palosaari, Antti <crope@iki.fi>
  • SDR API.
• Ribalda, Ricardo
  • Introduce HSV formats and other minor changes.
• Rubli, Martin
  • Designed and documented the VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS ioctls.
• Walls, Andy <awalls@md.metrocast.net>
  • Documented the fielded V4L2_MPEG_STREAM_VBI_FMT_IVTV MPEG stream embedded, sliced VBI data format in this specification.
• Verkuil, Hans <hverkuil@xs4all.nl>
  • Designed and documented the VIDIOC_LOG_STATUS ioctl, the extended control ioctls, major parts of the sliced VBI API, the MPEG encoder and decoder APIs and the DV Timings API.

Copyright © 1999-2016: Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab, Pawel Osciak, Sakari Ailus & Antti Palosaari.

Except when explicitly stated as GPL, programming examples within this part can be used and distributed without restrictions.

Revision History

revision:4.10 / 2016-07-15 (rr)

Introduce HSV formats.

revision:4.5 / 2015-10-29 (rr)

Extend VIDIOC_G_EXT_CTRLS;. Replace ctrl_class with a new union with ctrl_class and which. Which is used to select the current value of the control or the default value.

revision:4.4 / 2015-05-26 (ap)

Renamed V4L2_TUNER_ADC to V4L2_TUNER_SDR. Added V4L2_CID_RF_TUNER_RF_GAIN control. Added transmitter support for Software Defined Radio (SDR) Interface.

revision:4.1 / 2015-02-13 (mcc)

Fix documentation for media controller device nodes and add support for DVB device nodes. Add support for Tuner sub-device.

revision:3.19 / 2014-12-05 (hv)

Rewrote Colorspace chapter, added new enum v4l2_ycbcr_encoding and enum v4l2_quantization fields to struct v4l2_pix_format, struct v4l2_pix_format_mplane and struct v4l2_mbus_framefmt.

revision:3.17 / 2014-08-04 (lp, hv)

Extended struct v4l2_pix_format. Added format flags. Added compound control types and VIDIOC_QUERY_EXT_CTRL.

revision:3.15 / 2014-02-03 (hv, ap)

Update several sections of “Common API Elements”: “Opening and Closing Devices” “Querying Capabilities”, “Application Priority”, “Video Inputs and Outputs”, “Audio Inputs and Outputs” “Tuners and Modulators”, “Video Standards” and “Digital Video (DV) Timings”. Added SDR API.

revision:3.14 / 2013-11-25 (rr)

Set width and height as unsigned on v4l2_rect.

revision:3.11 / 2013-05-26 (hv)

Remove obsolete VIDIOC_DBG_G_CHIP_IDENT ioctl.

revision:3.10 / 2013-03-25 (hv)

Remove obsolete and unused DV_PRESET ioctls: VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET, VIDIOC_QUERY_DV_PRESET and VIDIOC_ENUM_DV_PRESET. Remove the related v4l2_input/output capability flags V4L2_IN_CAP_PRESETS and V4L2_OUT_CAP_PRESETS. Added VIDIOC_DBG_G_CHIP_INFO.

revision:3.9 / 2012-12-03 (sa, sn)

Added timestamp types to v4l2_buffer. Added V4L2_EVENT_CTRL_CH_RANGE control event changes flag.

revision:3.6 / 2012-07-02 (hv)

Added VIDIOC_ENUM_FREQ_BANDS.

revision:3.5 / 2012-05-07 (sa, sn, hv)

Added V4L2_CTRL_TYPE_INTEGER_MENU and V4L2 subdev selections API. Improved the description of V4L2_CID_COLORFX control, added V4L2_CID_COLORFX_CBCR control. Added camera controls V4L2_CID_AUTO_EXPOSURE_BIAS, V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE, V4L2_CID_IMAGE_STABILIZATION, V4L2_CID_ISO_SENSITIVITY, V4L2_CID_ISO_SENSITIVITY_AUTO, V4L2_CID_EXPOSURE_METERING, V4L2_CID_SCENE_MODE, V4L2_CID_3A_LOCK, V4L2_CID_AUTO_FOCUS_START, V4L2_CID_AUTO_FOCUS_STOP, V4L2_CID_AUTO_FOCUS_STATUS and V4L2_CID_AUTO_FOCUS_RANGE. Added VIDIOC_ENUM_DV_TIMINGS, VIDIOC_QUERY_DV_TIMINGS and VIDIOC_DV_TIMINGS_CAP.

revision:3.4 / 2012-01-25 (sn)

Added JPEG compression control class.

revision:3.3 / 2012-01-11 (hv)

Added device_caps field to struct v4l2_capabilities.

revision:3.2 / 2011-08-26 (hv)

Added V4L2_CTRL_FLAG_VOLATILE.

revision:3.1 / 2011-06-27 (mcc, po, hv)

Documented that VIDIOC_QUERYCAP now returns a per-subsystem version instead of a per-driver one. Standardize an error code for invalid ioctl. Added V4L2_CTRL_TYPE_BITMASK.

revision:2.6.39 / 2011-03-01 (mcc, po)

Removed VIDIOC_*_OLD from videodev2.h header and update it to reflect latest changes. Added the multi-planar API.

revision:2.6.37 / 2010-08-06 (hv)

Removed obsolete vtx (videotext) API.

revision:2.6.33 / 2009-12-03 (mk)

Added documentation for the Digital Video timings API.

revision:2.6.32 / 2009-08-31 (mcc)

Now, revisions will match the kernel version where the V4L2 API changes will be used by the Linux Kernel. Also added Remote Controller chapter.

revision:0.29 / 2009-08-26 (ev)

Added documentation for string controls and for FM Transmitter controls.

revision:0.28 / 2009-08-26 (gl)

Added V4L2_CID_BAND_STOP_FILTER documentation.

revision:0.27 / 2009-08-15 (mcc)

Added libv4l and Remote Controller documentation; added v4l2grab and keytable application examples.

revision:0.26 / 2009-07-23 (hv)

Finalized the RDS capture API. Added modulator and RDS encoder capabilities. Added support for string controls.

revision:0.25 / 2009-01-18 (hv)

Added pixel formats VYUY, NV16 and NV61, and changed the debug ioctls VIDIOC_DBG_G/S_REGISTER and VIDIOC_DBG_G_CHIP_IDENT. Added camera controls V4L2_CID_ZOOM_ABSOLUTE, V4L2_CID_ZOOM_RELATIVE, V4L2_CID_ZOOM_CONTINUOUS and V4L2_CID_PRIVACY.

revision:0.24 / 2008-03-04 (mhs)

Added pixel formats Y16 and SBGGR16, new controls and a camera controls class. Removed VIDIOC_G/S_MPEGCOMP.

revision:0.23 / 2007-08-30 (mhs)

Fixed a typo in VIDIOC_DBG_G/S_REGISTER. Clarified the byte order of packed pixel formats.

revision:0.22 / 2007-08-29 (mhs)

Added the Video Output Overlay interface, new MPEG controls, V4L2_FIELD_INTERLACED_TB and V4L2_FIELD_INTERLACED_BT, VIDIOC_DBG_G/S_REGISTER, VIDIOC_(TRY_)ENCODER_CMD, VIDIOC_G_CHIP_IDENT, VIDIOC_G_ENC_INDEX, new pixel formats. Clarifications in the cropping chapter, about RGB pixel formats, the mmap(), poll(), select(), read() and write() functions. Typographical fixes.

revision:0.21 / 2006-12-19 (mhs)

Fixed a link in the VIDIOC_G_EXT_CTRLS section.

revision:0.20 / 2006-11-24 (mhs)

Clarified the purpose of the audioset field in struct v4l2_input and v4l2_output.

revision:0.19 / 2006-10-19 (mhs)

Documented V4L2_PIX_FMT_RGB444.

revision:0.18 / 2006-10-18 (mhs)

Added the description of extended controls by Hans Verkuil. Linked V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE.

revision:0.17 / 2006-10-12 (mhs)

Corrected V4L2_PIX_FMT_HM12 description.

revision:0.16 / 2006-10-08 (mhs)

VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS are now part of the API.

revision:0.15 / 2006-09-23 (mhs)

Cleaned up the bibliography, added BT.653 and BT.1119. capture.c/start_capturing() for user pointer I/O did not initialize the buffer index. Documented the V4L MPEG and MJPEG VID_TYPEs and V4L2_PIX_FMT_SBGGR8. Updated the list of reserved pixel formats. See the history chapter for API changes.

revision:0.14 / 2006-09-14 (mr)

Added VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS proposal for frame format enumeration of digital devices.

revision:0.13 / 2006-04-07 (mhs)

Corrected the description of struct v4l2_window clips. New V4L2_STD_ and V4L2_TUNER_MODE_LANG1_LANG2 defines.

revision:0.12 / 2006-02-03 (mhs)

Corrected the description of struct v4l2_captureparm and v4l2_outputparm.

revision:0.11 / 2006-01-27 (mhs)

Improved the description of struct v4l2_tuner.

revision:0.10 / 2006-01-10 (mhs)

VIDIOC_G_INPUT and VIDIOC_S_PARM clarifications.

revision:0.9 / 2005-11-27 (mhs)

Improved the 525 line numbering diagram. Hans Verkuil and I rewrote the sliced VBI section. He also contributed a VIDIOC_LOG_STATUS page. Fixed VIDIOC_S_STD call in the video standard selection example. Various updates.

revision:0.8 / 2004-10-04 (mhs)

Somehow a piece of junk slipped into the capture example, removed.

revision:0.7 / 2004-09-19 (mhs)

Fixed video standard selection, control enumeration, downscaling and aspect example. Added read and user pointer i/o to video capture example.

revision:0.6 / 2004-08-01 (mhs)

v4l2_buffer changes, added video capture example, various corrections.

revision:0.5 / 2003-11-05 (mhs)

Pixel format erratum.

revision:0.4 / 2003-09-17 (mhs)

Corrected source and Makefile to generate a PDF. SGML fixes. Added latest API changes. Closed gaps in the history chapter.

revision:0.3 / 2003-02-05 (mhs)

Another draft, more corrections.

revision:0.2 / 2003-01-15 (mhs)

Second draft, with corrections pointed out by Gerd Knorr.

revision:0.1 / 2002-12-01 (mhs)

First draft, based on documentation by Bill Dirks and discussions on the V4L mailing list.