达芬奇技术之Codec Engine学习（一）-阿里云开发者社区

Codec Engine学习

1、Codec Engine概述

对于达芬奇（DAVINCI）平台的开发，所有的工程师都面临着如何实现ARM和DSP或协处理器的通信和协同工作。而TI的数字视频软件开发包（DVSDK）提供了Codec Engine这样一个软件模块来实现ARM和DSP或协处理器的协同工作。

如上图所示，Codec Engine是连接ARM和DSP或协处理器的桥梁，是介于应用层（ARM侧的应用程序）和信号处理层（DSP侧的算法）之间的软件模块。ARM应用程序调用Codec Engine的VISA （Video, Image, Speech, Audio）API，如图中VIDENC_process(a, b, c )。Codec Engine的stub （ARM侧）会把参数a, b, c以及要调用DSP侧process这个信息打包，通过消息队列（message queue）传递到DSP。Codec Engine的skeleton（DSP侧）会解开这个参数包，把参数a, b, c转换成DSP侧对应的参数x, y, z（比如ARM侧传递的是虚拟地址，而DSP只能认物理地址），DSP侧的server（优先级较低，负责和ARM通信的任务）会根据process这一信息创建一个DSP侧的process(x, y, x)任务最终实现VIDENC_process(a, b, c)的操作。

2、codec_engine_2_24_ReleaseNotes

Codec Engine入门第一步，从Codec Engine发布说明文档(release notes)开始，开发包中都有提供这个网址。本人手中的说明文档如下所示：

后面的1_00、1_01、...、2_23等代表版本。

下面给出2.24版本的页面。

下面重点学习2.24版本的说明文档。

该Codec Engine的发布适应于DaVinci 和OMAP 平台，使用户能够实例化和利用本地和远程编解码器。除了异构设备(如DM644x, DM6467, OMAP2530, OMAP3530, 等.)之外，还支持单处理器环境，特别是C64+器件(如DM643x, and DM648)，ARM器件(如DM355, DM365, OMAP3503) 和x86器件去运行Linux.系统。

Codec Engine是算法执行的软件平台，满足以下高层次的目标：

Robust - drives pre-integrated components with fully characterized performance.
Easy to use - app developers specify what needs to be run, but nothow orwhere.
Extensible and Configurable - new algorithms can be added by anyone, using standard tools and techniques.
Portable - API's are target, platform, and in many cases even codec independant.

对于我手中的DVS365的资料，Codec Engine资料位于：....\dvsdk_2_10_00_17\codec_engine_2_24\packages\ti\sdo\ce

主要的包有：

ti.sdo.ce - The Codec Engine runtime. ti.sdo.ce.video2 - The Codec Engine video component (supporting the XDM IVIDDEC2 interface). ti.sdo.ce.video1 - The Codec Engine video component (supporting the XDM IVIDDEC1 and IVIDENC1 interfaces). ti.sdo.ce.image1 - The Codec Engine image component (supporting the XDM IIMGDEC1 and IIMGENC1 interfaces). ti.sdo.ce.speech1 - The Codec Engine speech component (supporting the XDM ISPHDEC1 and ISPHENC1 interfaces). ti.sdo.ce.audio1 - The Codec Engine audio component (supporting the XDM IAUDDEC1 and IAUDENC1 interfaces). ti.sdo.ce.osal - The Codec Engine OS Abstraction Layer. This package insulates CE from the OS it's running on, and provides a few Modules for customers to use (e.g. Memory). ti.sdo.ce.utils.trace - The Codec Engine utility package for trace. This includes the TraceUtils module. This makes tracing features easier to use by an application. It will be supported in this release, but may be replaced in a future release with an incompatible implementation.

还包含过时的包，主要有：

ti.sdo.ce.video - The Codec Engine video component (supporting the XDM IVIDDEC and IVIDENC interfaces). ti.sdo.ce.image - The Codec Engine image component (supporting the XDM IIMGDEC and IIMGENC interfaces). ti.sdo.ce.speech - The Codec Engine speech/voice component (supporting the XDM ISPHDEC and ISPHENC interfaces).

ti.sdo.ce.audio - The Codec Engine audio component (supporting the XDM IAUDDEC and IAUDENC interfaces).

Codec Engine的工具主要有：

XDAIS 6.24
EDMA3 Resource Manager 1.06.00.01 (from the EDMA3 Low Level Driver product).
Framework Components 2.24
Linux Utils 2.24.01
WinCE Utils 1.00
LPM 1.24

常用的参考资料有：

Codec Engine Application Developer User's Guide
Codec Engine Server Integrator User's Guide (local copy |latest)
Codec Engine Algorithm Creator User's Guide (local copy |latest)
Codec Engine Application Programming Interface (API) Reference Guide (HTML |CHM)
Codec Engine System Programming Interface (SPI) Reference Guide (HTML |CHM)
Package Reference Guide - includes configuration details
Using Adapters to Run Existing XDAIS Algorithms with Codec Engine App Note

兼容性信息：

ti.dsplink.utils.lad - This package is incompatibile with the previous release. (Compatibility key:2,0,0 -> 2,0,0)
ti.dsplink.utils.ladclient - This package is compatibile with the previous release. (Compatibility key:1,0,0 -> 1,0,0)
ti.sdo.ce - This package is compatible with the previous release. (Compatibility key:1,0,6 -> 1,0,6)
ti.sdo.ce.alg - This package is compatible with the previous release. (Compatibility key:1,0,1 -> 1,0,1)
ti.sdo.ce.audio - This package is compatible with the previous release. (Compatibility key:1,0,2 -> 1,0,2)
ti.sdo.ce.audio1 - This package is compatible with the previous release. (Compatibility key:1,0,1 ->1,0,1)
ti.sdo.ce.bioslog - This package is compatible with the previous release. (Compatibility key:1,0,1 -> 1,0,1)
ti.sdo.ce.global - This package is compatible with the previous release. (Compatibility key:1,0,0 -> 1,0,0)
ti.sdo.ce.image - This package is compatible with the previous release. (Compatibility key:1,0,3 -> 1,0,3)
ti.sdo.ce.image1 - This package is compatible with the previous release. (Compatibility key:1,0,1 -> 1,0,1)
ti.sdo.ce.ipc - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.ipc.bios - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.ipc.dsplink - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.ipc.dsplink.dsp - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.ipc.linux - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.ipc.noOS - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.node - This package is compatible with the previous release. (Compatibility key:1,0,0 -> 1,0,0)
ti.sdo.ce.osal - This package is compatible with the previous release. (Compatibility key:2,0,2 -> 2,0,2)
ti.sdo.ce.osal.bios - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.osal.linux - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.osal.noOS - This package is compatible with the previous release. (Compatibility key:2,0,1 -> 2,0,1)
ti.sdo.ce.speech - This package is compatible with the previous release. (Compatibility key:1,0,2 -> 1,0,2)
ti.sdo.ce.speech1 - This package is compatible with the previous release. (Compatibility key:1,0,1 -> 1,0,1)
ti.sdo.ce.trace - This package is compatible with the previous release. (Compatibility key:1,0,0 -> 1,0,0)
ti.sdo.ce.utils - This package is compatible with the previous release. (Compatibility key:1,0,0 -> 1,0,0)
ti.sdo.ce.utils.trace - This package is compatible with the previous release. (Compatibility key:1,0,1 -> 1,0,1)
ti.sdo.ce.utils.xdm - This package is compatible with the previous release. (Compatibility key:1,0,2 -> 1,0,2)
ti.sdo.ce.video - This package is compatible with the previous release. (Compatibility key:1,0,3 -> 1,0,3)
ti.sdo.ce.video1 - This package is compatible with the previous release. (Compatibility key:1,0,2 -> 1,0,2)
ti.sdo.ce.video2 - This package is compatible with the previous release. (Compatibility key:1,0,2 -> 1,0,2)
ti.sdo.ce.video2.split - This package is compatible with the previous release. (Compatibility key:1,0,0 -> 1,0,0)
ti.sdo.ce.vidtranscode - This package is compatible with the previous release. (Compatibility key:1,0,1 -> 1,0,1)
ti.sdo.ce.wizards.genserver - This package is compatible with the previous release. (Compatibility key:1,0,0 -> 1,0,0)

The following packages are beta quality, and therefore compatibility keys are not maintained.

ti.sdo.ce.universal
ti.sdo.ce.vidanalytics

Validation：

This release was built and validated against using the following software components:

Framework Components 2.24
XDAIS 6.24
Linux Utils 2.24.01
WinCE Utils 1.00
XDCtools 3.10.05.61
DSP/BIOS Link 1.61.03 (Linux)/1.61.04 (WinCE) - see the Codec Engine Link Config wiki article for more details
DSP/BIOS 5.33.05
EDMA3 Resource Manager 1.06.00.01
LPM 1.24
gnu.targets.Linux86 - 4.1.0
gnu.targets.UCArm9 - 4.2.1
gnu.targets.arm.GCArmv5T - 4.2.1
microsoft.targets.arm.WinCE - 14.01.60511
ti.targets.C64P - 6.0.16
ti.targets.C674 - 6.1.5