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Diffstat (limited to 'media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_PutVLCBits.c')
| -rw-r--r-- | media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_PutVLCBits.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_PutVLCBits.c b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_PutVLCBits.c new file mode 100644 index 0000000..ca9efec --- /dev/null +++ b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/armVCM4P2_PutVLCBits.c @@ -0,0 +1,200 @@ +/** + * + * File Name: armVCM4P2_PutVLCBits.c + * OpenMAX DL: v1.0.2 + * Revision: 9641 + * Date: Thursday, February 7, 2008 + * + * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. + * + * + * + * Description: + * Contains module for VLC put bits to bitstream + * + */ + +#include "omxtypes.h" +#include "armOMX.h" + +#include "armVC.h" +#include "armCOMM.h" +#include "armCOMM_Bitstream.h" +#include "armVCM4P2_ZigZag_Tables.h" +#include "armVCM4P2_Huff_Tables_VLC.h" + + +/** + * Function: armVCM4P2_PutVLCBits + * + * Description: + * Checks the type of Escape Mode and put encoded bits for + * quantized DCT coefficients. + * + * Remarks: + * + * Parameters: + * [in] ppBitStream pointer to the pointer to the current byte in + * the bit stream + * [in] pBitOffset pointer to the bit position in the byte pointed + * by *ppBitStream. Valid within 0 to 7 + * [in] shortVideoHeader binary flag indicating presence of short_video_header; escape modes 0-3 are used if shortVideoHeader==0, + * and escape mode 4 is used when shortVideoHeader==1. + * [in] start start indicates whether the encoding begins with + * 0th element or 1st. + * [in] maxStoreRunL0 Max store possible (considering last and inter/intra) + * for last = 0 + * [in] maxStoreRunL1 Max store possible (considering last and inter/intra) + * for last = 1 + * [in] maxRunForMultipleEntriesL0 + * The run value after which level + * will be equal to 1: + * (considering last and inter/intra status) for last = 0 + * [in] maxRunForMultipleEntriesL1 + * The run value after which level + * will be equal to 1: + * (considering last and inter/intra status) for last = 1 + * [in] pRunIndexTableL0 Run Index table defined in + * armVCM4P2_Huff_Tables_VLC.c for last == 0 + * [in] pVlcTableL0 VLC table for last == 0 + * [in] pRunIndexTableL1 Run Index table defined in + * armVCM4P2_Huff_Tables_VLC.c for last == 1 + * [in] pVlcTableL1 VLC table for last == 1 + * [in] pLMAXTableL0 Level MAX table defined in + * armVCM4P2_Huff_Tables_VLC.c for last == 0 + * [in] pLMAXTableL1 Level MAX table defined in + * armVCM4P2_Huff_Tables_VLC.c for last == 1 + * [in] pRMAXTableL0 Run MAX table defined in + * armVCM4P2_Huff_Tables_VLC.c for last == 0 + * [in] pRMAXTableL1 Run MAX table defined in + * armVCM4P2_Huff_Tables_VLC.c for last == 1 + * [out] pQDctBlkCoef pointer to the quantized DCT coefficient + * [out] ppBitStream *ppBitStream is updated after the block is encoded + * so that it points to the current byte in the bit + * stream buffer. + * [out] pBitOffset *pBitOffset is updated so that it points to the + * current bit position in the byte pointed by + * *ppBitStream. + * + * Return Value: + * Standard OMXResult result. See enumeration for possible result codes. + * + */ + + +OMXResult armVCM4P2_PutVLCBits ( + OMX_U8 **ppBitStream, + OMX_INT * pBitOffset, + const OMX_S16 *pQDctBlkCoef, + OMX_INT shortVideoHeader, + OMX_U8 start, + OMX_U8 maxStoreRunL0, + OMX_U8 maxStoreRunL1, + OMX_U8 maxRunForMultipleEntriesL0, + OMX_U8 maxRunForMultipleEntriesL1, + const OMX_U8 * pRunIndexTableL0, + const ARM_VLC32 *pVlcTableL0, + const OMX_U8 * pRunIndexTableL1, + const ARM_VLC32 *pVlcTableL1, + const OMX_U8 * pLMAXTableL0, + const OMX_U8 * pLMAXTableL1, + const OMX_U8 * pRMAXTableL0, + const OMX_U8 * pRMAXTableL1, + const OMX_U8 * pZigzagTable +) +{ + + OMX_U32 storeRun = 0, run, storeRunPlus; + OMX_U8 last = 0, first = 1, fMode; + OMX_S16 level, storeLevel = 0, storeLevelPlus; + OMX_INT i; + + /* RLE encoding and packing the bits into the streams */ + for (i = start, run=0; i < 64; i++) + { + level = pQDctBlkCoef[pZigzagTable[i]]; + + /* Counting the run */ + if (level == 0) + { + run++; + } + + /* Found a non-zero coeff */ + else + { + if (first == 0) + { + last = 0; + + /* Check for a valid entry in the VLC table */ + storeLevelPlus = armSignCheck(storeLevel) * + (armAbs(storeLevel) - pLMAXTableL0[storeRun]); + storeRunPlus = storeRun - + (pRMAXTableL0[armAbs(storeLevel) - 1] + 1); + + fMode = armVCM4P2_CheckVLCEscapeMode( + storeRun, + storeRunPlus, + storeLevel, + storeLevelPlus, + maxStoreRunL0, + maxRunForMultipleEntriesL0, + shortVideoHeader, + pRunIndexTableL0); + + armVCM4P2_FillVLCBuffer ( + ppBitStream, + pBitOffset, + storeRun, + storeLevel, + storeRunPlus, + storeLevelPlus, + fMode, + last, + maxRunForMultipleEntriesL0, + pRunIndexTableL0, + pVlcTableL0); + } + storeLevel = level; + storeRun = run; + first = 0; + run = 0; + } + + } /* end of for loop for 64 elements */ + + /* writing the last element */ + last = 1; + + /* Check for a valid entry in the VLC table */ + storeLevelPlus = armSignCheck(storeLevel) * + (armAbs(storeLevel) - pLMAXTableL1[run]); + storeRunPlus = storeRun - + (pRMAXTableL1[armAbs(storeLevel) - 1] + 1); + fMode = armVCM4P2_CheckVLCEscapeMode( + storeRun, + storeRunPlus, + storeLevel, + storeLevelPlus, + maxStoreRunL1, + maxRunForMultipleEntriesL1, + shortVideoHeader, + pRunIndexTableL1); + + armVCM4P2_FillVLCBuffer ( + ppBitStream, + pBitOffset, + storeRun, + storeLevel, + storeRunPlus, + storeLevelPlus, + fMode, + last, + maxRunForMultipleEntriesL1, + pRunIndexTableL1, + pVlcTableL1); + return OMX_Sts_NoErr; +} + +/* End of File */ |