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Diffstat (limited to 'media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_GetVLCInfo.c')
| -rw-r--r-- | media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_GetVLCInfo.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_GetVLCInfo.c b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_GetVLCInfo.c new file mode 100644 index 0000000..81c59d6 --- /dev/null +++ b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_GetVLCInfo.c @@ -0,0 +1,192 @@ +/** + * + * File Name: omxVCM4P10_GetVLCInfo.c + * OpenMAX DL: v1.0.2 + * Revision: 9641 + * Date: Thursday, February 7, 2008 + * + * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. + * + * + * Description: + * + * This function extracts run-length encoding (RLE) information + */ + +#include "omxtypes.h" +#include "armOMX.h" +#include "omxVC.h" + +#include "armCOMM.h" +#include "armVC.h" + +/** + * Function: omxVCM4P10_GetVLCInfo (6.3.5.9.1) + * + * Description: + * This function extracts run-length encoding (RLE) information from the + * coefficient matrix. The results are returned in an OMXVCM4P10VLCInfo + * structure. + * + * Input Arguments: + * + * pSrcCoeff - pointer to the transform coefficient matrix. 8-byte + * alignment required. + * pScanMatrix - pointer to the scan order definition matrix. For a luma + * block the scan matrix should follow [ISO14496-10] section 8.5.4, + * and should contain the values 0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, + * 10, 7, 11, 14, 15. For a chroma block, the scan matrix should + * contain the values 0, 1, 2, 3. + * bAC - indicates presence of a DC coefficient; 0 = DC coefficient + * present, 1= DC coefficient absent. + * MaxNumCoef - specifies the number of coefficients contained in the + * transform coefficient matrix, pSrcCoeff. The value should be 16 + * for blocks of type LUMADC, LUMAAC, LUMALEVEL, and CHROMAAC. The + * value should be 4 for blocks of type CHROMADC. + * + * Output Arguments: + * + * pDstVLCInfo - pointer to structure that stores information for + * run-length coding. + * + * Return Value: + * + * OMX_Sts_NoErr - no error + * OMX_Sts_BadArgErr - bad arguments; returned if any of the following + * conditions are true: + * - at least one of the following pointers is NULL: + * pSrcCoeff, pScanMatrix, pDstVLCInfo + * - pSrcCoeff is not aligned on an 8-byte boundary + * + */ +OMXResult omxVCM4P10_GetVLCInfo ( + const OMX_S16* pSrcCoeff, + const OMX_U8* pScanMatrix, + OMX_U8 bAC, + OMX_U32 MaxNumCoef, + OMXVCM4P10VLCInfo* pDstVLCInfo +) +{ + OMX_INT i, MinIndex; + OMX_S32 Value; + OMX_U32 Mask = 4, RunBefore; + OMX_S16 *pLevel; + OMX_U8 *pRun; + OMX_S16 Buf [16]; + + /* check for argument error */ + armRetArgErrIf(pSrcCoeff == NULL, OMX_Sts_BadArgErr) + armRetArgErrIf(armNot8ByteAligned(pSrcCoeff), OMX_Sts_BadArgErr) + armRetArgErrIf(pScanMatrix == NULL, OMX_Sts_BadArgErr) + armRetArgErrIf(pDstVLCInfo == NULL, OMX_Sts_BadArgErr) + armRetArgErrIf(bAC > 1, OMX_Sts_BadArgErr) + armRetArgErrIf(MaxNumCoef > 16, OMX_Sts_BadArgErr) + + /* Initialize RLE Info structure */ + pDstVLCInfo->uTrailing_Ones = 0; + pDstVLCInfo->uTrailing_One_Signs = 0; + pDstVLCInfo->uNumCoeffs = 0; + pDstVLCInfo->uTotalZeros = 0; + + for (i = 0; i < 16; i++) + { + pDstVLCInfo->iLevels [i] = 0; + pDstVLCInfo->uRuns [i] = 0; + } + + MinIndex = (bAC == 0 && MaxNumCoef == 15) ? 1 : 0; + for (i = MinIndex; i < (MaxNumCoef + MinIndex); i++) + { + /* Scan */ + Buf [i - MinIndex] = pSrcCoeff [pScanMatrix [i]]; + } + + /* skip zeros at the end */ + i = MaxNumCoef - 1; + while (!Buf [i] && i >= 0) + { + i--; + } + + if (i < 0) + { + return OMX_Sts_NoErr; + } + + /* Fill RLE Info structure */ + pLevel = pDstVLCInfo->iLevels; + pRun = pDstVLCInfo->uRuns; + RunBefore = 0; + + /* Handle first non zero separate */ + pDstVLCInfo->uNumCoeffs++; + Value = Buf [i]; + if (Value == 1 || Value == -1) + { + pDstVLCInfo->uTrailing_Ones++; + + pDstVLCInfo->uTrailing_One_Signs |= + Value == -1 ? Mask : 0; + Mask >>= 1; + } + else + { + Value -= (Value > 0 ? 1 : -1); + *pLevel++ = Value; + Mask = 0; + } + + /* Remaining non zero */ + while (--i >= 0) + { + Value = Buf [i]; + if (Value) + { + pDstVLCInfo->uNumCoeffs++; + + /* Mask becomes zero after entering */ + if (Mask && + (Value == 1 || + Value == -1)) + { + pDstVLCInfo->uTrailing_Ones++; + + pDstVLCInfo->uTrailing_One_Signs |= + Value == -1 ? Mask : 0; + Mask >>= 1; + *pRun++ = RunBefore; + RunBefore = 0; + } + else + { + /* If 3 trailing ones are not completed */ + if (Mask) + { + Mask = 0; + Value -= (Value > 0 ? 1 : -1); + } + *pLevel++ = Value; + *pRun++ = RunBefore; + RunBefore = 0; + } + } + else + { + pDstVLCInfo->uTotalZeros++; + RunBefore++; + } + } + + /* Update last run */ + if (RunBefore) + { + *pRun++ = RunBefore; + } + + return OMX_Sts_NoErr; +} + +/***************************************************************************** + * END OF FILE + *****************************************************************************/ + |