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Diffstat (limited to 'media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_TransformQuant_LumaDC.c')
-rw-r--r-- | media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_TransformQuant_LumaDC.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_TransformQuant_LumaDC.c b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_TransformQuant_LumaDC.c new file mode 100644 index 0000000..2ccf7f0 --- /dev/null +++ b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_TransformQuant_LumaDC.c @@ -0,0 +1,119 @@ +/** + * + * File Name: omxVCM4P10_TransformQuant_LumaDC.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 will calculate 4x4 hadamard transform of luma DC coefficients + * and quantization + * + */ + +#include "omxtypes.h" +#include "armOMX.h" +#include "omxVC.h" + +#include "armCOMM.h" +#include "armVC.h" + +/** + * Function: omxVCM4P10_TransformQuant_LumaDC (6.3.5.6.2) + * + * Description: + * This function performs a 4x4 Hadamard transform of luma DC coefficients + * and then quantizes the coefficients. + * + * Input Arguments: + * + * pSrcDst - Pointer to the 4x4 array of luma DC coefficients. 16-byte + * alignment required. + * iQP - Quantization parameter; must be in the range [0,51]. + * + * Output Arguments: + * + * pSrcDst - Pointer to transformed and quantized coefficients. 16-byte + * alignment required. + * + * 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: pSrcDst + * - pSrcDst is not aligned on an 16-byte boundary + * + */ +OMXResult omxVCM4P10_TransformQuant_LumaDC( + OMX_S16* pSrcDst, + OMX_U32 iQP +) +{ + OMX_INT i, j; + OMX_S32 m1[4][4], m2[4][4]; + OMX_S32 Value; + OMX_U32 QbitsPlusOne, Two_f, MF; + + /* Check for argument error */ + armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr); + armRetArgErrIf(armNot16ByteAligned(pSrcDst), OMX_Sts_BadArgErr); + armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr); + + /* Hadamard Transform for 4x4 block */ + /* Horizontal Hadamard */ + for (i = 0; i < 4; i++) + { + j = i * 4; + + m1[i][0] = pSrcDst[j + 0] + pSrcDst[j + 2]; /* a+c */ + m1[i][1] = pSrcDst[j + 1] + pSrcDst[j + 3]; /* b+d */ + m1[i][2] = pSrcDst[j + 0] - pSrcDst[j + 2]; /* a-c */ + m1[i][3] = pSrcDst[j + 1] - pSrcDst[j + 3]; /* b-d */ + + m2[i][0] = m1[i][0] + m1[i][1]; /* a+b+c+d */ + m2[i][1] = m1[i][2] + m1[i][3]; /* a+b-c-d */ + m2[i][2] = m1[i][2] - m1[i][3]; /* a-b-c+d */ + m2[i][3] = m1[i][0] - m1[i][1]; /* a-b+c-d */ + + } + + /* Vertical */ + for (i = 0; i < 4; i++) + { + m1[0][i] = m2[0][i] + m2[2][i]; + m1[1][i] = m2[1][i] + m2[3][i]; + m1[2][i] = m2[0][i] - m2[2][i]; + m1[3][i] = m2[1][i] - m2[3][i]; + + m2[0][i] = m1[0][i] + m1[1][i]; + m2[1][i] = m1[2][i] + m1[3][i]; + m2[2][i] = m1[2][i] - m1[3][i]; + m2[3][i] = m1[0][i] - m1[1][i]; + } + + + /* Quantization */ + QbitsPlusOne = ARM_M4P10_Q_OFFSET + 1 + (iQP / 6); /*floor (QP/6)*/ + Two_f = (1 << QbitsPlusOne) / 3; /* 3->INTRA, 6->INTER */ + MF = armVCM4P10_MFMatrix [iQP % 6][0]; + + /* Scaling */ + for (j = 0; j < 4; j++) + { + for (i = 0; i < 4; i++) + { + Value = (armAbs((m2[j][i]/* + 1*/) / 2) * MF + Two_f) >> QbitsPlusOne; + pSrcDst[j * 4 + i] = (OMX_S16)((m2[j][i] < 0) ? -Value : Value); + } + } + return OMX_Sts_NoErr; +} + +/***************************************************************************** + * END OF FILE + *****************************************************************************/ + |