TI达芬奇H.264编码器在HDVICP2上的实战指南

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"TI DaVinci H.264 Encoder on HDVICP2 User's Guide" TI DaVinci H.264 Encoder是基于TI的高清视频接口协处理器2（HDVICP2）的视频编码解决方案，适用于媒体控制器平台。这份用户指南详细介绍了如何在具有HDVICP2的系统上编程和使用H.264编码器2.0版本。文档编号为SPRUHG3，出版于2012年5月。 H.264编码是一种高效的视频压缩标准，广泛应用于高清视频处理，如流媒体、视频会议和数字电视等领域。HDVICP2是TI专为高效处理视频编码任务而设计的硬件核心，它能够减轻CPU负担，提供更快的编码速度和更低的功耗。该用户指南可能包含以下关键知识点： 1. **HDVICP2架构**：详细解释了HDVICP2的内部结构，包括其处理单元、内存接口以及与系统其他部分（如CPU、GPU或DMA）的交互方式。 2. **H.264编码流程**：涵盖从原始视频数据到H.264编码流的整个过程，包括帧类型选择（I帧、P帧、B帧）、熵编码、运动估计和补偿、量化和反量化等步骤。 3. **编程接口**：介绍如何通过API或驱动程序与HDVICP2进行通信，设置编码参数，如比特率控制、编码质量、分辨率等。 4. **配置和初始化**：详细说明如何配置编码器以适应不同的输入视频源和输出需求，包括设置编码器配置文件、编码级别、宏块大小等。 5. **错误处理和调试**：提供在开发过程中可能遇到的问题及其解决方法，帮助开发者诊断和修复编码问题。 6. **性能优化**：讨论如何最大化利用HDVICP2的硬件加速能力，提高编码效率，以及如何平衡编码质量和带宽占用。 7. **应用示例**：包含实际的代码片段和工作流程，帮助开发者快速理解和集成H.264编码功能。 8. **TI的销售条款和条件**：强调TI对其产品和服务的销售条款，包括标准保修政策，以及产品和服务可能随时更改或终止的通知。 9. **责任限制**：TI不承担应用程序协助或客户产品设计方面的责任，鼓励客户进行充分的测试和验证。 10. **测试和质量控制**：虽然TI对产品进行了必要的测试以支持其保修，但并非所有参数都经过全面测试，用户需确保获取最新和完整的信息。这份用户指南对于那些需要在TI DaVinci平台上实现高效H.264编码的开发者来说是一份宝贵的参考资料，它提供了深入的技术细节和实用的操作指导。

Contents

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Contents

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Tables

Table 1-1. List of Abbreviations .................................................................................. 0-iv

Table 2-1. Component Directories ............................................................................... 2-4

Table 4-1. List of Enumerated Data Types ................................................................... 4-2

Table 4-2. H264 Encoder Specific Enumerated Data Types. .................................... 4-12

Table 4-3. H264 Encoder Constants ........................................................................... 4-26

Table 4-4. H.264 Encoder Error Statuses ................................................................... 4-26

Table 4-5. Default and Supported Values for IVIDENC2_Params ............................. 4-86

Table 4-6. Default and Supported Values for IVIDENC2_DynamicParams .............. 4-88

Table 4-7. Default and Supported Values for IH264ENC_RateControlParams ........ 4-89

Table 4-8. Default and Supported Values for IH264ENC_InterCodingParams ........ 4-91

Table 4-9. Default and Supported Values for IH264ENC_IntraCodingParams ........ 4-92

Table 4-10. Default and Supported Values for IH264ENC_NALUControlParams .... 4-94

Table 4-11. Default and Supported Values for IH264ENC_SliceCodingParams ...... 4-94

Table 4-12. Default and Supported Values for IH264ENC_LoopFilterParams ......... 4-95

Table 4-13. Default and Supported Values for IH264ENC_FMOCodingParams ...... 4-95

Table 4-14. Default and Supported Values for IH264ENC_VUICodingParams ........ 4-96

Table 4-15. Default and Supported Values for IH264ENC_StereoInfoParams ......... 4-96

Table 4-16. Default and Supported Values for IH264ENC_FramePackingSEIParams 4-

Table 4-17. Default and Supported Values for IH264ENC_SVCCodingParams ....... 4-97

Table 4-18. Default and Supported Values for IH264ENC_Params .......................... 4-98

Table 4-19. Default and Supported Values for IH264ENC_DynamicParams ......... 4-101

Table G-1 Creation time parameter related to sub frame level data communication

for input data of video encoder ............................................................................ 5-1

Table G-2 Dynamic parameters related to sub frame level data communication for

input data of video encoder .................................................................................. 5-2

Table G-3 Handshake parameters related to sub frame level data communication for

input data of video encoder .................................................................................. 5-2

Table G-4 Creation time parameter related to sub frame level data communication

for output data of video encoder .......................................................................... 5-3

Table G-5 Dynamic parameters related to sub frame level data communication for

output data of video encoder................................................................................ 5-4

Table G-6 Dynamic parameters related to accept partial buffer for output bit-stream

5-6

Table G-7 Handshake parameters related to accept partial buffer for output bit-

stream .................................................................................................................... 5-7

Table G-8 Handshake parameters related to sub frame level data communication for

output data of video encoder (outputDataMode = IVIDEO_SLICEMODE) ......... 5-9

Table G-9 Handshake parameters related to sub frame level data communication for

output data of video encoder (outputDataMode = IVIDEO_FIXEDLENGTH) .... 5-11

Table J-1 Prameter Mapping for various encoding presets ....................................... 5-3

Table M-1 : Maximum number of channels supported for various resolutions ........ 5-1

Introduction

1-2

1.1 Overview of XDAIS, XDM, and IRES

TI‟s multimedia codec implementations are based on the eXpressDSP Digital Media (XDM)

standard. XDM is an extension of the eXpressDSP Algorithm Interface Standard (XDAIS). IRES is

the interface for management and utilization of special resource types such as hardware

accelerators, certain types of memory, and DMA. This interface allows the client application to

query and provide the algorithm its requested resources.

1.1.1 XDAIS Overview

An eXpressDSP-compliant algorithm is a module that implements the abstract interface IALG. The

IALG API takes the memory management function away from the algorithm and places it in the

hosting framework. Thus, an interaction occurs between the algorithm and the framework. This

interaction allows the client application to allocate memory for the algorithm and also share memory

between algorithms. It also allows the memory to be moved around while an algorithm is operating

in the system. In order to facilitate these functionalities, the IALG interface defines the following

APIs:

 algAlloc()

 algInit()

 algActivate()

 algDeactivate()

 algFree()

The algAlloc() API allows the algorithm to communicate its memory requirements to the client

application. The algInit() API allows the algorithm to initialize the memory allocated by the client

application. The algFree() API allows the algorithm to communicate the memory to be freed when

an instance is no longer required.

Once an algorithm instance object is created, it can be used to process data in real-time. The

algActivate() API provides a notification to the algorithm instance that one or more algorithm

processing methods is about to be run zero or more times in succession. After the processing

methods have been run, the client application calls the algDeactivate() API prior to reusing any

of the instance‟s scratch memory.

The IALG interface also defines three more optional APIs algControl(), algNumAlloc(), and

algMoved(). For more details on these APIs, see TMS320 DSP Algorithm Standard API

Reference (literature number SPRU360).

1.1.2 XDM Overview

In the multimedia application space, you have the choice of integrating any codec into your

multimedia system. For example, if you are building a video encoder system, you can use any of

the available video encoders (such as MPEG4, H.263, or H.264) in your system. To enable easy

integration with the client application, it is important that all codecs with similar functionality use

similar APIs. XDM was primarily defined as an extension to XDAIS to ensure uniformity across

different classes of codecs (for example audio, video, image, and speech). The XDM standard

defines the following two APIs:

 control()

 process()

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