10c1bc742181ded4930842b46e9507372f0b1b963James Dong/* ---------------------------------------------------------------- 20c1bc742181ded4930842b46e9507372f0b1b963James Dong * 30c1bc742181ded4930842b46e9507372f0b1b963James Dong * 40c1bc742181ded4930842b46e9507372f0b1b963James Dong * File Name: omxVCM4P10_DecodeChromaDcCoeffsToPairCAVLC.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_DecodeChromaDcCoeffsToPairCAVLC (6.3.4.1.1) 260c1bc742181ded4930842b46e9507372f0b1b963James Dong * 270c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 280c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs CAVLC decoding and inverse raster scan for a 2x2 block of 290c1bc742181ded4930842b46e9507372f0b1b963James Dong * ChromaDCLevel. The decoded coefficients in the packed position-coefficient 300c1bc742181ded4930842b46e9507372f0b1b963James Dong * buffer are stored in reverse zig-zag order, i.e., the first buffer element 310c1bc742181ded4930842b46e9507372f0b1b963James Dong * contains the last non-zero postion-coefficient pair of the block. Within 320c1bc742181ded4930842b46e9507372f0b1b963James Dong * each position-coefficient pair, the position entry indicates the 330c1bc742181ded4930842b46e9507372f0b1b963James Dong * raster-scan position of the coefficient, while the coefficient entry 340c1bc742181ded4930842b46e9507372f0b1b963James Dong * contains the coefficient value. 350c1bc742181ded4930842b46e9507372f0b1b963James Dong * 360c1bc742181ded4930842b46e9507372f0b1b963James Dong * Input Arguments: 370c1bc742181ded4930842b46e9507372f0b1b963James Dong * 380c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppBitStream - Double pointer to current byte in bit stream buffer 390c1bc742181ded4930842b46e9507372f0b1b963James Dong * pOffset - Pointer to current bit position in the byte pointed to by 400c1bc742181ded4930842b46e9507372f0b1b963James Dong * *ppBitStream; valid in the range [0,7]. 410c1bc742181ded4930842b46e9507372f0b1b963James Dong * 420c1bc742181ded4930842b46e9507372f0b1b963James Dong * Output Arguments: 430c1bc742181ded4930842b46e9507372f0b1b963James Dong * 440c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppBitStream - *ppBitStream is updated after each block is decoded 450c1bc742181ded4930842b46e9507372f0b1b963James Dong * pOffset - *pOffset is updated after each block is decoded 460c1bc742181ded4930842b46e9507372f0b1b963James Dong * pNumCoeff - Pointer to the number of nonzero coefficients in this block 470c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppPosCoefBuf - Double pointer to destination residual 480c1bc742181ded4930842b46e9507372f0b1b963James Dong * coefficient-position pair buffer. Buffer position 490c1bc742181ded4930842b46e9507372f0b1b963James Dong * (*ppPosCoefBuf) is updated upon return, unless there are only 500c1bc742181ded4930842b46e9507372f0b1b963James Dong * zero coefficients in the currently decoded block. In this case 510c1bc742181ded4930842b46e9507372f0b1b963James Dong * the caller is expected to bypass the transform/dequantization of 520c1bc742181ded4930842b46e9507372f0b1b963James Dong * the empty blocks. 530c1bc742181ded4930842b46e9507372f0b1b963James Dong * 540c1bc742181ded4930842b46e9507372f0b1b963James Dong * Return Value: 550c1bc742181ded4930842b46e9507372f0b1b963James Dong * 560c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_NoErr, if the function runs without error. 570c1bc742181ded4930842b46e9507372f0b1b963James Dong * 580c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_BadArgErr - bad arguments: if one of the following cases occurs: 590c1bc742181ded4930842b46e9507372f0b1b963James Dong * - ppBitStream or pOffset is NULL. 600c1bc742181ded4930842b46e9507372f0b1b963James Dong * - ppPosCoefBuf or pNumCoeff is NULL. 610c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_Err - if one of the following is true: 620c1bc742181ded4930842b46e9507372f0b1b963James Dong * - an illegal code is encountered in the bitstream 630c1bc742181ded4930842b46e9507372f0b1b963James Dong * 640c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 650c1bc742181ded4930842b46e9507372f0b1b963James Dong 660c1bc742181ded4930842b46e9507372f0b1b963James DongOMXResult omxVCM4P10_DecodeChromaDcCoeffsToPairCAVLC ( 670c1bc742181ded4930842b46e9507372f0b1b963James Dong const OMX_U8** ppBitStream, 680c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_S32* pOffset, 690c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8* pNumCoeff, 700c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8** ppPosCoefbuf 710c1bc742181ded4930842b46e9507372f0b1b963James Dong ) 720c1bc742181ded4930842b46e9507372f0b1b963James Dong 730c1bc742181ded4930842b46e9507372f0b1b963James Dong{ 740c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(ppBitStream==NULL , OMX_Sts_BadArgErr); 750c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*ppBitStream==NULL , OMX_Sts_BadArgErr); 760c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pOffset==NULL , OMX_Sts_BadArgErr); 770c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*pOffset<0 , OMX_Sts_BadArgErr); 780c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*pOffset>7 , OMX_Sts_BadArgErr); 790c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pNumCoeff==NULL , OMX_Sts_BadArgErr); 800c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(ppPosCoefbuf==NULL , OMX_Sts_BadArgErr); 810c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*ppPosCoefbuf==NULL , OMX_Sts_BadArgErr); 820c1bc742181ded4930842b46e9507372f0b1b963James Dong 830c1bc742181ded4930842b46e9507372f0b1b963James Dong return armVCM4P10_DecodeCoeffsToPair(ppBitStream, pOffset, pNumCoeff, 840c1bc742181ded4930842b46e9507372f0b1b963James Dong ppPosCoefbuf, 4, 4); 850c1bc742181ded4930842b46e9507372f0b1b963James Dong 860c1bc742181ded4930842b46e9507372f0b1b963James Dong} 87