pngd_get_image_data

Product	Supported (√/x)
Atlas A3 training products/Atlas A3 inference products	√
Atlas A2 training products/Atlas A2 inference products	√
Atlas training products	x
Atlas inference products	√
Atlas 200I/500 A2 inference products	√

Fetches the decoded image 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. The value range of this parameter is [0, 128). The maximum number of channels is 128.
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 fluctuate.

Parameter

Description

chn

Int, decoding channel ID.

The value range of this parameter is [0, 128). The maximum number of channels is 128.

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 fluctuate.

Return Value	Description
png_pic_info	Dict. Obtains the decoded picture information dictionary. For details, see hi_pic_info. The decoded output is stored in the device buffer.
stream	Dict, pointer to information dictionary of decoded input streams. For details, see hi_img_stream.
ret	Int, error code. 0: success. Other values: failures. For details, see PNGD Return Codes.

Return Value

Description

png_pic_info

Dict. Obtains the decoded picture information dictionary. For details, see hi_pic_info. The decoded output is stored in the device buffer.

stream

Dict, pointer to information dictionary of decoded input streams. 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