178e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar/* 278e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * Copyright (C) 2007-2008 ARM Limited 378e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 478e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * Licensed under the Apache License, Version 2.0 (the "License"); 578e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * you may not use this file except in compliance with the License. 678e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * You may obtain a copy of the License at 778e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 878e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * http://www.apache.org/licenses/LICENSE-2.0 978e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 1078e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * Unless required by applicable law or agreed to in writing, software 1178e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * distributed under the License is distributed on an "AS IS" BASIS, 1278e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1378e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * See the License for the specific language governing permissions and 1478e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * limitations under the License. 1578e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 1678e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar */ 170c1bc742181ded4930842b46e9507372f0b1b963James Dong/* ---------------------------------------------------------------- 180c1bc742181ded4930842b46e9507372f0b1b963James Dong * 190c1bc742181ded4930842b46e9507372f0b1b963James Dong * 200c1bc742181ded4930842b46e9507372f0b1b963James Dong * File Name: omxVCM4P10_DecodeChromaDcCoeffsToPairCAVLC.c 210c1bc742181ded4930842b46e9507372f0b1b963James Dong * OpenMAX DL: v1.0.2 220c1bc742181ded4930842b46e9507372f0b1b963James Dong * Revision: 9641 230c1bc742181ded4930842b46e9507372f0b1b963James Dong * Date: Thursday, February 7, 2008 240c1bc742181ded4930842b46e9507372f0b1b963James Dong * 250c1bc742181ded4930842b46e9507372f0b1b963James Dong * 260c1bc742181ded4930842b46e9507372f0b1b963James Dong * 270c1bc742181ded4930842b46e9507372f0b1b963James Dong * 280c1bc742181ded4930842b46e9507372f0b1b963James Dong * H.264 decode coefficients module 290c1bc742181ded4930842b46e9507372f0b1b963James Dong * 300c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 310c1bc742181ded4930842b46e9507372f0b1b963James Dong 320c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxtypes.h" 330c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armOMX.h" 340c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxVC.h" 350c1bc742181ded4930842b46e9507372f0b1b963James Dong 360c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armCOMM.h" 370c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armVC.h" 380c1bc742181ded4930842b46e9507372f0b1b963James Dong 390c1bc742181ded4930842b46e9507372f0b1b963James Dong/** 400c1bc742181ded4930842b46e9507372f0b1b963James Dong * Function: omxVCM4P10_DecodeChromaDcCoeffsToPairCAVLC (6.3.4.1.1) 410c1bc742181ded4930842b46e9507372f0b1b963James Dong * 420c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 430c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs CAVLC decoding and inverse raster scan for a 2x2 block of 440c1bc742181ded4930842b46e9507372f0b1b963James Dong * ChromaDCLevel. The decoded coefficients in the packed position-coefficient 450c1bc742181ded4930842b46e9507372f0b1b963James Dong * buffer are stored in reverse zig-zag order, i.e., the first buffer element 460c1bc742181ded4930842b46e9507372f0b1b963James Dong * contains the last non-zero postion-coefficient pair of the block. Within 470c1bc742181ded4930842b46e9507372f0b1b963James Dong * each position-coefficient pair, the position entry indicates the 480c1bc742181ded4930842b46e9507372f0b1b963James Dong * raster-scan position of the coefficient, while the coefficient entry 490c1bc742181ded4930842b46e9507372f0b1b963James Dong * contains the coefficient value. 500c1bc742181ded4930842b46e9507372f0b1b963James Dong * 510c1bc742181ded4930842b46e9507372f0b1b963James Dong * Input Arguments: 520c1bc742181ded4930842b46e9507372f0b1b963James Dong * 530c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppBitStream - Double pointer to current byte in bit stream buffer 540c1bc742181ded4930842b46e9507372f0b1b963James Dong * pOffset - Pointer to current bit position in the byte pointed to by 550c1bc742181ded4930842b46e9507372f0b1b963James Dong * *ppBitStream; valid in the range [0,7]. 560c1bc742181ded4930842b46e9507372f0b1b963James Dong * 570c1bc742181ded4930842b46e9507372f0b1b963James Dong * Output Arguments: 580c1bc742181ded4930842b46e9507372f0b1b963James Dong * 590c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppBitStream - *ppBitStream is updated after each block is decoded 600c1bc742181ded4930842b46e9507372f0b1b963James Dong * pOffset - *pOffset is updated after each block is decoded 610c1bc742181ded4930842b46e9507372f0b1b963James Dong * pNumCoeff - Pointer to the number of nonzero coefficients in this block 620c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppPosCoefBuf - Double pointer to destination residual 630c1bc742181ded4930842b46e9507372f0b1b963James Dong * coefficient-position pair buffer. Buffer position 640c1bc742181ded4930842b46e9507372f0b1b963James Dong * (*ppPosCoefBuf) is updated upon return, unless there are only 650c1bc742181ded4930842b46e9507372f0b1b963James Dong * zero coefficients in the currently decoded block. In this case 660c1bc742181ded4930842b46e9507372f0b1b963James Dong * the caller is expected to bypass the transform/dequantization of 670c1bc742181ded4930842b46e9507372f0b1b963James Dong * the empty blocks. 680c1bc742181ded4930842b46e9507372f0b1b963James Dong * 690c1bc742181ded4930842b46e9507372f0b1b963James Dong * Return Value: 700c1bc742181ded4930842b46e9507372f0b1b963James Dong * 710c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_NoErr, if the function runs without error. 720c1bc742181ded4930842b46e9507372f0b1b963James Dong * 730c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_BadArgErr - bad arguments: if one of the following cases occurs: 740c1bc742181ded4930842b46e9507372f0b1b963James Dong * - ppBitStream or pOffset is NULL. 750c1bc742181ded4930842b46e9507372f0b1b963James Dong * - ppPosCoefBuf or pNumCoeff is NULL. 760c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_Err - if one of the following is true: 770c1bc742181ded4930842b46e9507372f0b1b963James Dong * - an illegal code is encountered in the bitstream 780c1bc742181ded4930842b46e9507372f0b1b963James Dong * 790c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 800c1bc742181ded4930842b46e9507372f0b1b963James Dong 810c1bc742181ded4930842b46e9507372f0b1b963James DongOMXResult omxVCM4P10_DecodeChromaDcCoeffsToPairCAVLC ( 820c1bc742181ded4930842b46e9507372f0b1b963James Dong const OMX_U8** ppBitStream, 830c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_S32* pOffset, 840c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8* pNumCoeff, 850c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8** ppPosCoefbuf 860c1bc742181ded4930842b46e9507372f0b1b963James Dong ) 870c1bc742181ded4930842b46e9507372f0b1b963James Dong 880c1bc742181ded4930842b46e9507372f0b1b963James Dong{ 890c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(ppBitStream==NULL , OMX_Sts_BadArgErr); 900c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*ppBitStream==NULL , OMX_Sts_BadArgErr); 910c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pOffset==NULL , OMX_Sts_BadArgErr); 920c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*pOffset<0 , OMX_Sts_BadArgErr); 930c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*pOffset>7 , OMX_Sts_BadArgErr); 940c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pNumCoeff==NULL , OMX_Sts_BadArgErr); 950c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(ppPosCoefbuf==NULL , OMX_Sts_BadArgErr); 960c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(*ppPosCoefbuf==NULL , OMX_Sts_BadArgErr); 970c1bc742181ded4930842b46e9507372f0b1b963James Dong 980c1bc742181ded4930842b46e9507372f0b1b963James Dong return armVCM4P10_DecodeCoeffsToPair(ppBitStream, pOffset, pNumCoeff, 990c1bc742181ded4930842b46e9507372f0b1b963James Dong ppPosCoefbuf, 4, 4); 1000c1bc742181ded4930842b46e9507372f0b1b963James Dong 1010c1bc742181ded4930842b46e9507372f0b1b963James Dong} 102