博通（Broadcom）公司的BCM7043是实时高清H.264/AVC, MPEG-2和MPEG-4SP编码器和码型转换器，设计用于有线电视，卫星电视， IP电视和地面电视机顶盒，家庭媒体中心，个人数字媒体视频记录仪以及HD DVD, 蓝光（Blu-ray）和DVD播放机/刻录机。BCM7043能够从BCM7043的HDMI输入 (HD 和SD) 或 ITU-R BT.656 输入 (SD)中进行实时的高清H.264/AVC和MPEG-2编码。本文介绍BCM7043主要功能和性能，以及方框图和BCM7043应用示意图。
BCM7043
HD/SD AVC/MPEG Video/Audio Encoder and Transcoder/Transcaler/Transrater
The BCM7043 is a real-time high definition H.264/AVC, MPEG-2, and MPEG-4SP encoder and transcoder that is designed for use in cable, satellite, IP and terrestrial set-top boxes, home media centers, personal digital video recorders and HD DVD, Blu-ray, and DVD player/recorders. The BCM7043 is able to perform real-time high definition H.264/AVC and MPEG-2 encoding from the BCM7043’s HDMI input (HD and SD) or ITU-R BT.656 input (SD). Additionally, the BCM7043 is capable of transcoding up to four SD streams simultaneously and one stream at up to six times the real-time rate.
Video Compression (Encoder) Engine Uncompressed video input is delivered to the encoder via ITU-R BT.656, HDMI, or host bus interfaces. The BCM7043’s video compression engine converts a sequence of uncompressed video pictures into H.264/AVC (ISO/IEC 14496-10), MPEG-2 (ISO/IEC 13818-2), or MPvbEG-4 Simple Profile compressed streams.
Advanced Video Decoder The Advanced Video Decoder (AVD) module is a high-definition AVC/ MPEG-2/VC-1/DivX/MPEG-4 SP video decoder core.
Transport Layer The transport layer of the BCM7043 manages audio/video synchronization for transport stream and program stream input and output. It accepts data from both stream and stored sources. On input, transport layer streams are demultiplexed to extract elementary audio and video streams prior to decoding and on output, audio and video elementary streams are (re)multiplexed together to create program and transport streams.
Advanced Audio Module The BCM7043 contains a programmable audio processor that supports real-time decode of MPEG-1, Layer-ll, Dolby Digital AC-3, AAC-HE, AAC-LC, Dolby Digital Plus Stereo and 5.1, DTS, DTS-HD, MP-3, PCM; and real-time encoding of MPEG-1, Layer-ll, Dolby Digital AC- 3, AAC-HE, AAC-LC, MP3, PCM audio formats.
Video Input Processor The Video Input Processor (VIP) module conditions uncompressed video for encoding. It may receive uncompressed video from an ITU-R BT.656 or HDMI inputs, or it may read uncompressed video from SDRAM. The BCM7043 produces excellent quality video and compression efficiency by incorporating an advanced video preprocessor that performs Motion Compensated Temporal Filtering (MCTF) and digital noise reduction and contains a motion adaptive de-interlacer and a variable geometry scaler.
Security Security is provided by the Broadcom Security Processor, which performs Content Protection (CP), encryption/decryption (DES, 3DES, AES), Firmware Tamper Protection, Regionalized Memory/Client Protection, and One-Time-Programmable (OTP) memory.
主要功能：
• BCM7043 multistandard encoding support for:
- H.264/AVC
- MPEG-2
MPEG-4 SP
• BCM7043 multistandard transcoding support for:
- MPEG-2 ←→ H.264/AVC
- H.264/AVC, MPEG-2 → MPEG-4 SP
- VC-1 → H.264/AVC, MPEG-2, MPEG-4 SP
- MPEG-4 SP → H.264/AVC, MPEG-2
- DivX → H.264/AVC, MPEG-2, MPEG-4 SP
• Audio encoding support for MPEG-1, Layer-ll, Dolby® Digital AC-3, AAC-HE, AAC-LC, MP3, and PCM
• Audio decoding support for MPEG-1, Layer-ll, Dolby Digital AC-3, AAC-HE, AAC-LC, Dolby Digital Plus Stereo and 5.1, DTS, DTS-HD, MP-3, and PCM
• High-performance video and audio transcoding:
- HD → HD (real-time)
- HD → SD (real-time)
- SD → Lower than SD (up to 6x real-time)
- SD → SD (up to four streams simultaneously)
• System layer: MPEG-2 transport, PS, ES
- Supports HD DVD, Blu-ray™ and DVD
主要特性：
• Advanced video variable-geometry scaler with color space converter
• Motion Compensated Temporal Filter (MCTF) noise reduction
• Motion Adaptive Deinterlacer (MAD)
• Programmable audio encoder/decoder/transcoder
• Advanced transport stream input demultiplexer
• Transport stream multiplexer with PCR correction
• HDMI interface
• VBI support
• Several host interface options (PCI, PCIe™, EBI)
• Dual ITU-R BT.656 digital video interface
• Dual I2S digital audio interfaces
• Broadcom Security Processor
• Uses 400-MHz DDR2 memory
图1。BCM7043方框图
图2。BCM7043应用示意图
