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SDK Developer Reference for VP8

Media SDK API Version 1.30

LEGAL DISCLAIMER

Optimization Notice

Overview

Intel® Media Software Development Kit – SDK is a software development library that exposes the media acceleration capabilities of Intel platforms for decoding, encoding and video processing. The API library covers a wide range of Intel platforms.

This document describes the SDK extension to support VP8 video codec.

Document Conventions

The SDK API uses the Verdana typeface for normal prose. With the exception of section headings and the table of contents, all code-related items appear in the Courier New typeface. Examples relevant to this document are mfxStatus and MFXInit. Hyperlinks appear in underlined boldface, such as mfxStatus.

Acronyms and Abbreviations
SDK Intel® Media Software Development Kit – SDK
API Application Programming Interface

Architecture & Programming Guide

SDK extension for VP8 requires the application to use an additional include file mfxvp8.h, in addition to the regular SDK include files. No additional library is needed at the link time.

Include these files:
#include “mfxvideo.h”    /* SDK functions in C */
#include “mfxvideo++.h”    /* Optional for C++ development */
#include “mfxvp8.h”        /* VP8 development */
Link to this library:
    libmfx.lib            /* The SDK dispatcher library */

The SDK extends the codec identifier MFX_CODEC_VP8 for VP8 processing.

Decoding Procedure

The application should use the same decoding procedure that described in the SDK API Reference Manual. The only difference is in partitioning of input bitstream. Unlike other supported by SDK decoders, VP8 can accept only complete frame as input and application should provide it accompanied by MFX_BITSTREAM_COMPLETE_FRAME flag.

Encoding Procedure

The application should use the same encoding procedure that described in the SDK API Reference Manual.

Structure Reference

mfxExtVP8CodingOption

Definition

typedef struct {
    mfxExtBuffer    Header;

    mfxU16   Version;
    mfxU16   EnableMultipleSegments;
    mfxU16   LoopFilterType;
    mfxU16   LoopFilterLevel[4];
    mfxU16   SharpnessLevel;
    mfxU16   NumTokenPartitions;
    mfxI16   LoopFilterRefTypeDelta[4];
    mfxI16   LoopFilterMbModeDelta[4];
    mfxI16   SegmentQPDelta[4];
    mfxI16   CoeffTypeQPDelta[5];
    mfxU16   WriteIVFHeaders;
    mfxU32   NumFramesForIVFHeader;
    mfxU16   reserved[223];
} mfxExtVP8CodingOption;

Description

This mfxExtVP8CodingOption structure describes VP8 encoder configuration parameters.

Members
Header.BufferId Must be set to MFX_EXTBUFF_VP8_CODING_OPTION.
Version Determines the bitstream version. Corresponds to the same VP8 syntax element in frame_tag.
EnableMultipleSegments Set this option to ON, to enable segmentation. This is tri-state option. See the CodingOptionValue enumerator for values of this option in the SDK API Reference Manual for details
LoopFilterType Selecting the type of filter (normal or simple). Corresponds to VP8 syntax element filter_type.
LoopFilterLevel Controls the filter strength. Corresponds to VP8 syntax element loop_filter_level.
SharpnessLevel Controls the filter sensitivity. Corresponds to VP8 syntax element sharpness_level.
NumTokenPartitions Specifies number of token partitions in the coded frame.
LoopFilterRefTypeDelta Loop filter level delta for reference type (intra, last, golden, altref).
LoopFilterMbModeDelta Loop filter level delta for MB modes.
SegmentQPDelta QP delta for segment.
CoeffTypeQPDelta QP delta for coefficient type (YDC, Y2AC, Y2DC, UVAC, UVDC).
WriteIVFHeaders Set this option to ON, to enable insertion of IVF container headers into bitstream. This is tri-state option. See the CodingOptionValue enumerator for values of this option in the SDK API Reference Manual for details
NumFramesForIVFHeader Specifies number of frames for IVF header when WriteIVFHeaders is ON.

Change History

This structure is available since SDK API 1.12.

Enumerator Reference

CodecProfile

Description

The CodecProfile enumerator is extended to support VP8 profiles. See the SDK API Reference Manual for additional profile definitions.

Name/Description
MFX_PROFILE_VP8_0, MFX_PROFILE_VP8_1, MFX_PROFILE_VP8_2, MFX_PROFILE_VP8_3 VP8 profiles

Change History

This enumerator is available since SDK API 1.0. SDK API 1.12 added VP8 profiles.

ExtendedBufferID

Description

The ExtendedBufferID enumerator is extended to add VP8 support. See the SDK API Reference Manual for additional definitions.

Name/Description
MFX_EXTBUFF_VP8_CODING_OPTION This extended buffer describes VP8 encoder configuration parameters. See the mfxExtVP8CodingOption structure for details. The application can attach this buffer to the mfxVideoParam structure for encoding initialization.

Change History

This enumerator is available since SDK API 1.0.

SDK API 1.12 adds MFX_EXTBUFF_VP8_CODING_OPTION.