VdecConfig

Description

Defines the structure for video stream decoding.

Structure Definition

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struct VdecConfig {
    uint32_t width = 0;
    uint32_t height = 0;
    MxbaseStreamFormat inputVideoFormat = MXBASE_STREAM_FORMAT_H264_MAIN_LEVEL;
    MxbasePixelFormat outputImageFormat = MXBASE_PIXEL_FORMAT_YUV_SEMIPLANAR_420;
    uint32_t channelId = 0;
    uint32_t deviceId  = 0;
    pthread_t threadId  = 0; 
    DecodeCallBackFunction callbackFunc = nullptr; 
    uint32_t outMode = 0;
    uint32_t videoChannel = 0;
    uint32_t skipInterval = 0;
    uint32_t cscMatrix = 0;
    void* userData = nullptr;
};

Parameters

Parameter

Input/Output

Description

width

Input

Image width.

height

Input

Image height.

inputVideoFormat

Input

Format of the input image.

outputImageFormat

Input

Format of the output image.

channelId

Input

ID of a decoding channel.

deviceId

Input

Device ID.

threadId

Input

ID of a callback thread.

callbackFunc

Input

Callback function.

The structure is as follows:

APP_ERROR (*DecodeCallBackFunction)(std::shared_ptr<void> buffer, DvppDataInfo& dvppDataInfo, void* userData)
  • buffer: output data after decoding.
  • dvppDataInfo: output data information after decoding.
  • userData: user-defined data pointer.

outMode

Input

Frame output mode. The value can be 0 or 1. The default value is 0.

  • 0: delayed frame output mode. The VDEC starts to output the decoding result only after receiving multiple frames in the stream.
  • 1: real-time frame output mode. VDEC starts to output the decoding result in real time after receiving one frame in the stream. Only H.264/H.265 standard streams with simple reference relationships are supported (no long-term reference frames or B-frames).

videoChannel

Input

Reserved.

skipInterval

Input

Frame skipping parameter.

cscMatrix

Input

CSC option. Only Atlas inference products support this API.

  • HI_CSC_MATRIX_BT601_WIDE = 0: CSC matrix based on the BT.601 Wide standard. The parameter values are as follows:
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    # YUV-to-RGB conversion:
# | R |   | 1.000  0.000   1.402 |   | Y - 0 |
# | G | = | 1.000 -0.344  -0.714 | * | U - 128 | 
# | B |   | 1.000  1.772   0.000 |   | V - 128 |
# RGB-to-YUV conversion:
# | Y |   |-0.5  |   |  0.299  0.587  0.114  |   | R |        
# | U | = |127.5 | + | -0.168 -0.331  0.500  | * | G | 
# | V |   |127.5 |   |  0.500 -0.419  -0.081 |   | B |
  • HI_CSC_MATRIX_BT601_NARROW = 1: CSC matrix based on the BT.601 Narrow standard. The parameter values are as follows:
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    # YUV-to-RGB conversion:
# | R |   | 1.16438  0.00000   1.59602 |   | Y - 16 |
# | G | = | 1.16438 -0.39176  -0.81297 | * | U - 128 | 
# | B |   | 1.16438  2.01723   0.00000 |   | V - 128 |
# RGB-to-YUV conversion:
# | Y |   |16 |   |  0.25679  0.51564  0.10014 |   | R |        
# | U | = |128| + | -0.14491 -0.29099  0.43922 | * | G | 
# | V |   |128|   |  0.42941 -0.36779 -0.07143 |   | B |
  • HI_CSC_MATRIX_BT709_WIDE = 2: CSC matrix based on the BT.709 Wide standard. The parameter values are as follows:
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    # YUV-to-RGB conversion:
# | R |   | 1.00000  0.00000   1.57480 |   | Y - 0 |
# | G | = | 1.00000 -0.18732  -0.46812 | * | U - 128 | 
# | B |   | 1.00000  1.85560   0.00000 |   | V - 128 |
# RGB-to-YUV conversion:
# | Y |   |0  |   |  0.21260  0.71520  0.07220 |   | R |        
# | U | = |128| + | -0.11457 -0.38543  0.50000 | * | G | 
# | V |   |128|   |  0.50000 -0.45415 -0.04585 |   | B |
  • HI_CSC_MATRIX_BT709_NARROW = 3: CSC matrix based on the BT.709 Narrow standard. The parameter values are as follows:
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    # YUV-to-RGB conversion:
# | R |   | 1.16438  0.00000   1.79274 |   | Y - 16 |
# | G | = | 1.16438 -0.21325  -0.53291 | * | U - 128 | 
# | B |   | 1.16438  2.11240   0.00000 |   | V - 128 |
# RGB-to-YUV conversion:
# | Y |   |16 |   |  0.18259  0.62825  0.06342 |   | R |        
# | U | = |128| + | -0.09840 -0.33857  0.43922 | * | G | 
# | V |   |128|   |  0.42941 -0.39894 -0.04027 |   | B |
  • HI_CSC_MATRIX_BT2020_WIDE = 4: CSC matrix based on the BT.2020 Wide standard. The parameter values are as follows:
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    # YUV-to-RGB conversion:
# | R |   | 1.00000  0.00000   1.47460 |   | Y - 0 |
# | G | = | 1.00000 -0.16455  -0.57135 | * | U - 128 | 
# | B |   | 1.00000  1.88140   0.00000 |   | V - 128 |
# RGB-to-YUV conversion:
# | Y |   |0  |   |  0.26270  0.67800  0.05930 |   | R |        
# | U | = |128| + | -0.13963 -0.36037  0.50000 | * | G | 
# | V |   |128|   |  0.50000 -0.45979 -0.04021 |   | B |
  • HI_CSC_MATRIX_BT2020_NARROW = 5: CSC matrix based on the BT.2020 Narrow standard. The parameter values are as follows:
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    # YUV-to-RGB conversion:
# | R |   | 1.16438  0.00000   1.67868 |   | Y - 16 |
# | G | = | 1.16438 -0.18733  -0.65042 | * | U - 128 | 
# | B |   | 1.16438  2.14177   0.00000 |   | V - 128 |
# RGB-to-YUV conversion:
# | Y |   |16 |   |  0.22564  0.59558  0.05209 |   | R |        
# | U | = |128| + | -0.11992 -0.31656  0.43922 | * | G | 
# | V |   |128|   |  0.42941 -0.40389 -0.03533 |   | B |

userData

Input

User-defined data.
Parent topic: General Data Structures