AP0201AT datasheet(16/31 Pages) ONSEMI

16 / 31 page

AP0201AT

www.onsemi.com

Output Video Formats

The AP0201AT conforms with the IEEE standard for both

MJPEG and H.264 video outputs. For reference, the

standard is “IEEE Standard for Layer 2 Transport Protocol

for Time−Sensitive Applications in Bridged Local Area

Networks” and can be obtained from IEEE.

H.264 Format

The AP0201AT is compliant with the ITU−T REC. H.264

standard

published

the

Telecommunication

Standardization

Sector

the

International

Telecommunication Union, which is equivalent to ISO/IEC

14496−10.

The AP0201AT supports the standard H.264 for video

compression which is equivalent to MPEG−4 Part 10, also

known as MPEG−4 Advanced Video Coding (AVC). The

AP0201AT utilizes an advanced High profiles compliant

encoder, constrained to the All−Intra encoding schemes. It

supports real time encoding of 4:2:0 video streams, up to

Level 5.2, in 8 and 10 bit sample depths. The core only needs

to be programmed once per video sequence. Once

programmed, the AP0201AT can encode an arbitrary

number of video frames, without the need of any further

intervention from the host system.

H.264 Features

The AP0201AT H.264 encoding includes the following

features:

• High 10 intra profile encoding

• 8− and 10−bit sample depth encoding

• Level up to 5.2

• ITU−T H.264 Annex B compliant NAL byte stream

output

• CQP − VBR encoding mode

♦ Rate−Distortion optimized output

♦ Up to 240MBits/s output (CAVLC)

• CBR encoding mode

♦ HRD CPB compliant CBR NAL output

♦ Sub−frame operation with tunable number of

macroblocks basis

♦ Further micro adjustment of quantization per

macroblock maximizes the perceived video quality

♦ Both Rate−Distortion metrics and perceived video

quality optimized

♦ On−the−fly rate changes are supported

♦ Up to 240 Mbits/s output (CAVLC)

• Advanced Intra prediction

♦ All four Intra 16x16 prediction modes

♦ All four Intra Chroma prediction modes

♦ All nine Intra 4x4 prediction modes

• Error resilience

♦ Multiple slices per frame encoding

♦ Deblocking filter in the decoder can be optionally

constrained to operate within slice boundaries

• Optional advanced thresholding of quantized transform

coefficients

♦ Eliminates spares and insignificant transform

coefficients

♦ Improves the compression efficiency

♦ Near−zero impact to the measured video quality

♦ Zero impact to the perceived, subjective, video

quality

• Run−time tunable operation enables decoder

compatibility trade−offs

♦ Full control of allowed Intra prediction modes

♦ Single or multiple slices per frame encoding

♦ Option and tunable deblocking filter operation

♦ CAVLC coding

MJPEG FORMAT

JPEG Encoder

The JPEG compression engine in the AP0201AT is a

highly integrated, high−performance solution that provides

for low power consumption and programmability of JPEG

compression parameters for image quality control.

The JPEG encoding block is designed for continuous

image flow and is ideal for low power applications. After

initial configuration for a target application, it can be

controlled easily for instantaneous stop or restart. A flexible

configuration and control interface allows for full

programmability of various JPEG−specific parameters and

tables.

JPEG Encoding Highlights

• Sequential DCT (baseline) ISO/IEC 10918−1

JPEG−compliant

• YCbCr 4:2:0 format compression

• JPEG capability at full resolution with JFIF− or

RFC2435−compliant header

• Programmable automatic control of bit rate

Stream Breakdown

An MJPEG video stream consists of the following

sequence of data sections. Each JPEG frame must have the

following characteristics:

• Color Encoding is YcbCr

• 8 bits per color component, (24 bits/pixel before

subsampling)

• 420 Subsampling

• Baseline sequential DCT (SOF0)

JPEG Header

The MJPEG stream can be output with 4 different header

settings.

Three of them are similar to each other. The first is the

standard JPEG header as defined in the original JPEG

specification. The second is a JFIF header which is the

standard header plus a JFIF segment. The third is a standard

header minus the Huffman table. Since, for this design, the

Huffman table is constant, some bandwidth can be saved by

not including it.

AP0201AT Datasheet(PDF) 16 Page - ON Semiconductor

AP0201AT Datasheet(HTML) 16 Page - ON Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Datasheet Download

Link URL