pngd_get_image_data

Product	Supported/Unsupported
Atlas 350 Accelerator Card	√
Atlas A3 training product/Atlas A3 inference product	√
Atlas A2 training product/Atlas A2 inference product	√
Atlas training product	x
Atlas inference product	√
Atlas 200I/500 A2 inference product	√

Fetches the decoded images and input stream of a decoding channel.

C Prototype

hi_s32 hi_mpi_pngd_get_image_data(hi_pngd_chn chn, hi_pic_info *png_pic_info, hi_img_stream *stream, hi_s32 milli_sec)

Python Function

png_pic_info, stream, ret = acl.himpi.pngd_get_image_data(chn, milli_sec)

Parameter	Description
chn	Int, decoding channel ID.
milli_sec	Int, timeout interval, in milliseconds. -1: blocking mode. 0: non-blocking mode. > 0: timeout interval (timeout mode). The timeout interval varies with the operating system. The deviation is generally within a time slice of an operating system. For example, if the time slice of an operating system is 4 ms and the value of milli_sec is set to 1, the actual timeout interval ranges from 1 ms to 5 ms. When the CPU load is high, the timeout interval may still fluctuate.

Parameter

Description

chn

Int, decoding channel ID.

milli_sec

Int, timeout interval, in milliseconds.

-1: blocking mode.
0: non-blocking mode.
> 0: timeout interval (timeout mode). The timeout interval varies with the operating system. The deviation is generally within a time slice of an operating system. For example, if the time slice of an operating system is 4 ms and the value of milli_sec is set to 1, the actual timeout interval ranges from 1 ms to 5 ms. When the CPU load is high, the timeout interval may still fluctuate.

Return Value	Description
png_pic_info	Dict, dictionary of decoded image information. For details, see hi_pic_info. The decode output is stored in the device memory.
stream	Dict, information dictionary of the decoded input stream. For details, see hi_img_stream.
ret	Int, error code. 0 indicates success. Other values indicate failures. For details, see PNGD Return Codes.

Description

png_pic_info

Dict, dictionary of decoded image information. For details, see hi_pic_info. The decode output is stored in the device memory.

stream

Dict, information dictionary of the decoded input stream. For details, see hi_img_stream.

ret

Int, error code.

This API fetches decoded images in blocking mode, non-blocking mode, or timeout mode, as specified by the milli_sec parameter.
Ensure that a channel has been created. Otherwise, the error code HI_ERR_PNGD_UNEXIST is returned. If the channel is destroyed in the image fetching process, the error code HI_ERR_PNGD_UNEXIST is returned.
In non-blocking mode, if the buffer has no decoded images, the error code HI_ERR_PNGD_BUF_EMPTY is returned.
In timeout mode, if no decoded images are fetched within the specified timeout interval, the error code HI_ERR_PNGD_BUF_EMPTY is returned.
This API fetches the PNGD result, including the input buffer and output buffer.
For details about the requirements for the input and output images during PNGD image decoding, see Functions and Restrictions.

For the API call sequence, see Functions and Restrictions.

Parent topic: PNGD APIs