pngd_send_stream

Product	Supported
Ascend 950PR/Ascend 950DT	√
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	√

Feeds the stream and decoding result buffer to a decoding channel.

C Prototype

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

Python Function

ret = acl.himpi.pngd_send_stream(chn, stream, png_pic_info, 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.
stream	Dict, input stream information. For details, see hi_img_stream. The configured addr in this dictionary must be a buffer address on the device.
png_pic_info	Dict, output image information dictionary. See hi_pic_info.
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
ret	Int, error code. 0: success. Other values: failures. For details, see PNGD Return Codes.

Ensure that a channel has been created. Otherwise, the error code HI_ERR_PNGD_UNEXIST is returned. If the channel is destroyed when streams are being sent, the error code HI_ERR_PNGD_UNEXIST is returned.
To send a stream, a complete PNG image is required. Otherwise, an error occurs during decoding.
In non-blocking mode, the error code HI_ERR_PNGD_BUF_FULL is returned if the stream buffer is full.
In timeout mode, if the stream fails to be fed within the specified timeout interval, the error code HI_ERR_PNGD_BUF_FULL is returned.
For details about the requirements for the input and output images during image decoding, see Functions and Restrictions.
For decoding, the input and output buffers must be allocated by calling acl.himpi.dvpp_malloc and freed by calling acl.himpi.dvpp_free, respectively. The input and output buffers can be freed only after the result is obtained by calling pngd_get_image_data.

For the API call sequence, see Functions and Restrictions.

Parent topic: PNGD APIs