Function Usage

Constructor of the VideoDecoder class. If the construction fails due to insufficient memory or an unidentified processor, the "std::runtime_error" exception occurs.

Prototype

VideoDecoder::VideoDecoder(const VideoDecodeConfig& vDecodeConfig, const int32_t deviceId = 0, const uint32_t channelId = 0);

Parameters

Parameter	Input/Output	Description
vDecodeConfig	Input	Parameters for video decoding (transferred in a structure)
deviceId	Input	Processor where the video decoder is deployed. The default ID is 0. Value range: [0, Number of detected processors – 1].
channelId	Input	Video stream index of the video decoder Atlas 200/300/500 inference product: The value range is [0, 31]. If the same channel ID is constructed repeatedly, the construction fails. Atlas 200I/500 A2 inference product: The value range is [0, 127]. If the same channel ID is constructed repeatedly, the construction fails. Atlas inference product: The value range is [0, 255]. If the same channel ID is constructed repeatedly, the channel ID is automatically adjusted. Atlas 800I A2 inference product: The value range is [0, 255]. If the same channel ID is constructed repeatedly, the channel ID is automatically adjusted. Note that a maximum of 32 video decoding channels can be occupied at the same time. If the number of occupied video decoding channels exceeds 32, new channels fail to be created.

Parameter

Input/Output

Description

vDecodeConfig

Input

Parameters for video decoding (transferred in a structure)

deviceId

Input

Processor where the video decoder is deployed. The default ID is 0.

Value range: [0, Number of detected processors – 1].

channelId

Input

Video stream index of the video decoder

Atlas 200/300/500 inference product: The value range is [0, 31].
If the same channel ID is constructed repeatedly, the construction fails.
Atlas 200I/500 A2 inference product: The value range is [0, 127].
If the same channel ID is constructed repeatedly, the construction fails.
Atlas inference product: The value range is [0, 255].
If the same channel ID is constructed repeatedly, the channel ID is automatically adjusted.

Atlas 800I A2 inference product: The value range is [0, 255]. If the same channel ID is constructed repeatedly, the channel ID is automatically adjusted. Note that a maximum of 32 video decoding channels can be occupied at the same time. If the number of occupied video decoding channels exceeds 32, new channels fail to be created.