omxVCM4P10_DecodeCoeffsToPairCAVLC.c revision 0c1bc742181ded4930842b46e9507372f0b1b963
10c1bc742181ded4930842b46e9507372f0b1b963James Dong/* ---------------------------------------------------------------- 20c1bc742181ded4930842b46e9507372f0b1b963James Dong * 30c1bc742181ded4930842b46e9507372f0b1b963James Dong * 40c1bc742181ded4930842b46e9507372f0b1b963James Dong * File Name: omxVCM4P10_DecodeCoeffsToPairCAVLC.c 50c1bc742181ded4930842b46e9507372f0b1b963James Dong * OpenMAX DL: v1.0.2 60c1bc742181ded4930842b46e9507372f0b1b963James Dong * Revision: 9641 70c1bc742181ded4930842b46e9507372f0b1b963James Dong * Date: Thursday, February 7, 2008 80c1bc742181ded4930842b46e9507372f0b1b963James Dong * 90c1bc742181ded4930842b46e9507372f0b1b963James Dong * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 100c1bc742181ded4930842b46e9507372f0b1b963James Dong * 110c1bc742181ded4930842b46e9507372f0b1b963James Dong * 120c1bc742181ded4930842b46e9507372f0b1b963James Dong * 130c1bc742181ded4930842b46e9507372f0b1b963James Dong * H.264 decode coefficients module 140c1bc742181ded4930842b46e9507372f0b1b963James Dong * 150c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 160c1bc742181ded4930842b46e9507372f0b1b963James Dong 170c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxtypes.h" 180c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armOMX.h" 190c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxVC.h" 200c1bc742181ded4930842b46e9507372f0b1b963James Dong 210c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armCOMM.h" 220c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armVC.h" 230c1bc742181ded4930842b46e9507372f0b1b963James Dong 240c1bc742181ded4930842b46e9507372f0b1b963James Dong/** 250c1bc742181ded4930842b46e9507372f0b1b963James Dong * Function: omxVCM4P10_DecodeCoeffsToPairCAVLC 260c1bc742181ded4930842b46e9507372f0b1b963James Dong * 270c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 280c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs CAVLC decoding and inverse zigzag scan for 4x4 block of 290c1bc742181ded4930842b46e9507372f0b1b963James Dong * Intra16x16DCLevel, Intra16x16ACLevel,LumaLevel, and ChromaACLevel. 300c1bc742181ded4930842b46e9507372f0b1b963James Dong * Inverse field scan is not supported. The decoded coefficients in packed 310c1bc742181ded4930842b46e9507372f0b1b963James Dong * position-coefficient buffer are stored in increasing zigzag order instead 320c1bc742181ded4930842b46e9507372f0b1b963James Dong * of position order. 330c1bc742181ded4930842b46e9507372f0b1b963James Dong * 340c1bc742181ded4930842b46e9507372f0b1b963James Dong * Remarks: 350c1bc742181ded4930842b46e9507372f0b1b963James Dong * 360c1bc742181ded4930842b46e9507372f0b1b963James Dong * Parameters: 370c1bc742181ded4930842b46e9507372f0b1b963James Dong * [in] ppBitStream Double pointer to current byte in bit stream buffer 380c1bc742181ded4930842b46e9507372f0b1b963James Dong * [in] pOffset Pointer to current bit position in the byte pointed 390c1bc742181ded4930842b46e9507372f0b1b963James Dong * to by *ppBitStream 400c1bc742181ded4930842b46e9507372f0b1b963James Dong * [in] sMaxNumCoeff Maximum number of non-zero coefficients in current 410c1bc742181ded4930842b46e9507372f0b1b963James Dong * block 420c1bc742181ded4930842b46e9507372f0b1b963James Dong * [in] sVLCSelect VLC table selector, obtained from number of non-zero 430c1bc742181ded4930842b46e9507372f0b1b963James Dong * AC coefficients of above and left 4x4 blocks. It is 440c1bc742181ded4930842b46e9507372f0b1b963James Dong * equivalent to the variable nC described in H.264 standard 450c1bc742181ded4930842b46e9507372f0b1b963James Dong * table 9-5, except its value can��t be less than zero. 460c1bc742181ded4930842b46e9507372f0b1b963James Dong * [out] ppBitStream *ppBitStream is updated after each block is decoded 470c1bc742181ded4930842b46e9507372f0b1b963James Dong * [out] pOffset *pOffset is updated after each block is decoded 480c1bc742181ded4930842b46e9507372f0b1b963James Dong * [out] pNumCoeff Pointer to the number of nonzero coefficients in 490c1bc742181ded4930842b46e9507372f0b1b963James Dong * this block 500c1bc742181ded4930842b46e9507372f0b1b963James Dong * [out] ppPosCoefbuf Double pointer to destination residual 510c1bc742181ded4930842b46e9507372f0b1b963James Dong * coefficient-position pair buffer 520c1bc742181ded4930842b46e9507372f0b1b963James Dong * Return Value: 530c1bc742181ded4930842b46e9507372f0b1b963James Dong * Standard omxError result. See enumeration for possible result codes. 540c1bc742181ded4930842b46e9507372f0b1b963James Dong * 550c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 560c1bc742181ded4930842b46e9507372f0b1b963James Dong 570c1bc742181ded4930842b46e9507372f0b1b963James DongOMXResult omxVCM4P10_DecodeCoeffsToPairCAVLC( 580c1bc742181ded4930842b46e9507372f0b1b963James Dong const OMX_U8** ppBitStream, 590c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_S32* pOffset, 600c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8* pNumCoeff, 610c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8**ppPosCoefbuf, 620c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_INT sVLCSelect, 630c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_INT sMaxNumCoeff 640c1bc742181ded4930842b46e9507372f0b1b963James Dong ) 650c1bc742181ded4930842b46e9507372f0b1b963James Dong{ 660c1bc742181ded4930842b46e9507372f0b1b963James Dong return armVCM4P10_DecodeCoeffsToPair(ppBitStream, pOffset, pNumCoeff, 670c1bc742181ded4930842b46e9507372f0b1b963James Dong ppPosCoefbuf, sVLCSelect, sMaxNumCoeff); 680c1bc742181ded4930842b46e9507372f0b1b963James Dong} 69