omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c revision 78e52bfac041d71ce53b5b13c2abf78af742b09d
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 * File Name: omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c 200c1bc742181ded4930842b46e9507372f0b1b963James Dong * OpenMAX DL: v1.0.2 210c1bc742181ded4930842b46e9507372f0b1b963James Dong * Revision: 9641 220c1bc742181ded4930842b46e9507372f0b1b963James Dong * Date: Thursday, February 7, 2008 230c1bc742181ded4930842b46e9507372f0b1b963James Dong * 240c1bc742181ded4930842b46e9507372f0b1b963James Dong * 250c1bc742181ded4930842b46e9507372f0b1b963James Dong * 260c1bc742181ded4930842b46e9507372f0b1b963James Dong * 270c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 280c1bc742181ded4930842b46e9507372f0b1b963James Dong * Contains modules for zigzag scanning and VLC encoding 290c1bc742181ded4930842b46e9507372f0b1b963James Dong * for intra block. 300c1bc742181ded4930842b46e9507372f0b1b963James Dong * 310c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 320c1bc742181ded4930842b46e9507372f0b1b963James Dong 330c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxtypes.h" 340c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armOMX.h" 350c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxVC.h" 360c1bc742181ded4930842b46e9507372f0b1b963James Dong 370c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armVC.h" 380c1bc742181ded4930842b46e9507372f0b1b963James Dong 390c1bc742181ded4930842b46e9507372f0b1b963James Dong 400c1bc742181ded4930842b46e9507372f0b1b963James Dong/** 410c1bc742181ded4930842b46e9507372f0b1b963James Dong * Function: omxVCM4P2_EncodeVLCZigzag_IntraACVLC (6.2.4.5.2) 420c1bc742181ded4930842b46e9507372f0b1b963James Dong * 430c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 440c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs zigzag scan and VLC encoding of AC and DC coefficients for one 450c1bc742181ded4930842b46e9507372f0b1b963James Dong * intra block. Two versions of the function (DCVLC and ACVLC) are provided 460c1bc742181ded4930842b46e9507372f0b1b963James Dong * in order to support the two different methods of processing DC 470c1bc742181ded4930842b46e9507372f0b1b963James Dong * coefficients, as described in [ISO14496-2], subclause 7.4.1.4, Intra DC 480c1bc742181ded4930842b46e9507372f0b1b963James Dong * Coefficient Decoding for the Case of Switched VLC Encoding. 490c1bc742181ded4930842b46e9507372f0b1b963James Dong * 500c1bc742181ded4930842b46e9507372f0b1b963James Dong * Input Arguments: 510c1bc742181ded4930842b46e9507372f0b1b963James Dong * 520c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppBitStream - double pointer to the current byte in the bitstream 530c1bc742181ded4930842b46e9507372f0b1b963James Dong * pBitOffset - pointer to the bit position in the byte pointed by 540c1bc742181ded4930842b46e9507372f0b1b963James Dong * *ppBitStream. Valid within 0 to 7. 550c1bc742181ded4930842b46e9507372f0b1b963James Dong * pQDctBlkCoef - pointer to the quantized DCT coefficient 560c1bc742181ded4930842b46e9507372f0b1b963James Dong * predDir - AC prediction direction, which is used to decide the zigzag 570c1bc742181ded4930842b46e9507372f0b1b963James Dong * scan pattern; takes one of the following values: 580c1bc742181ded4930842b46e9507372f0b1b963James Dong * - OMX_VC_NONE - AC prediction not used. 590c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs classical zigzag scan. 600c1bc742181ded4930842b46e9507372f0b1b963James Dong * - OMX_VC_HORIZONTAL - Horizontal prediction. 610c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs alternate-vertical zigzag scan. 620c1bc742181ded4930842b46e9507372f0b1b963James Dong * - OMX_VC_VERTICAL - Vertical prediction. 630c1bc742181ded4930842b46e9507372f0b1b963James Dong * Performs alternate-horizontal zigzag scan. 640c1bc742181ded4930842b46e9507372f0b1b963James Dong * pattern - block pattern which is used to decide whether this block is 650c1bc742181ded4930842b46e9507372f0b1b963James Dong * encoded 660c1bc742181ded4930842b46e9507372f0b1b963James Dong * shortVideoHeader - binary flag indicating presence of 670c1bc742181ded4930842b46e9507372f0b1b963James Dong * short_video_header; escape modes 0-3 are used if 680c1bc742181ded4930842b46e9507372f0b1b963James Dong * shortVideoHeader==0, and escape mode 4 is used when 690c1bc742181ded4930842b46e9507372f0b1b963James Dong * shortVideoHeader==1. 700c1bc742181ded4930842b46e9507372f0b1b963James Dong * 710c1bc742181ded4930842b46e9507372f0b1b963James Dong * Output Arguments: 720c1bc742181ded4930842b46e9507372f0b1b963James Dong * 730c1bc742181ded4930842b46e9507372f0b1b963James Dong * ppBitStream - *ppBitStream is updated after the block is encoded, so 740c1bc742181ded4930842b46e9507372f0b1b963James Dong * that it points to the current byte in the bit stream buffer. 750c1bc742181ded4930842b46e9507372f0b1b963James Dong * pBitOffset - *pBitOffset is updated so that it points to the current bit 760c1bc742181ded4930842b46e9507372f0b1b963James Dong * position in the byte pointed by *ppBitStream. 770c1bc742181ded4930842b46e9507372f0b1b963James Dong * 780c1bc742181ded4930842b46e9507372f0b1b963James Dong * Return Value: 790c1bc742181ded4930842b46e9507372f0b1b963James Dong * 800c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_NoErr - no error 810c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_BadArgErr - Bad arguments: 820c1bc742181ded4930842b46e9507372f0b1b963James Dong * - At least one of the following pointers is NULL: ppBitStream, 830c1bc742181ded4930842b46e9507372f0b1b963James Dong * *ppBitStream, pBitOffset, pQDctBlkCoef. 840c1bc742181ded4930842b46e9507372f0b1b963James Dong * - *pBitOffset < 0, or *pBitOffset >7. 850c1bc742181ded4930842b46e9507372f0b1b963James Dong * - PredDir is not one of: OMX_VC_NONE, OMX_VC_HORIZONTAL, or 860c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_VC_VERTICAL. 870c1bc742181ded4930842b46e9507372f0b1b963James Dong * - VideoComp is not one component of enum OMXVCM4P2VideoComponent. 880c1bc742181ded4930842b46e9507372f0b1b963James Dong * 890c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 900c1bc742181ded4930842b46e9507372f0b1b963James Dong 910c1bc742181ded4930842b46e9507372f0b1b963James DongOMXResult omxVCM4P2_EncodeVLCZigzag_IntraACVLC( 920c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8 **ppBitStream, 930c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_INT *pBitOffset, 940c1bc742181ded4930842b46e9507372f0b1b963James Dong const OMX_S16 *pQDctBlkCoef, 950c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8 predDir, 960c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8 pattern, 970c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_INT shortVideoHeader 980c1bc742181ded4930842b46e9507372f0b1b963James Dong) 990c1bc742181ded4930842b46e9507372f0b1b963James Dong{ 1000c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_U8 start = 0; 1010c1bc742181ded4930842b46e9507372f0b1b963James Dong 1020c1bc742181ded4930842b46e9507372f0b1b963James Dong return armVCM4P2_EncodeVLCZigzag_Intra( 1030c1bc742181ded4930842b46e9507372f0b1b963James Dong ppBitStream, 1040c1bc742181ded4930842b46e9507372f0b1b963James Dong pBitOffset, 1050c1bc742181ded4930842b46e9507372f0b1b963James Dong pQDctBlkCoef, 1060c1bc742181ded4930842b46e9507372f0b1b963James Dong predDir, 1070c1bc742181ded4930842b46e9507372f0b1b963James Dong pattern, 1080c1bc742181ded4930842b46e9507372f0b1b963James Dong shortVideoHeader, 1090c1bc742181ded4930842b46e9507372f0b1b963James Dong start); 1100c1bc742181ded4930842b46e9507372f0b1b963James Dong} 1110c1bc742181ded4930842b46e9507372f0b1b963James Dong 1120c1bc742181ded4930842b46e9507372f0b1b963James Dong/* End of file */ 113