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Diffstat (limited to 'media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_InvTransformDequant_LumaDC.c')
-rw-r--r-- | media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_InvTransformDequant_LumaDC.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_InvTransformDequant_LumaDC.c b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_InvTransformDequant_LumaDC.c new file mode 100644 index 0000000..a3b1200 --- /dev/null +++ b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p10/src/omxVCM4P10_InvTransformDequant_LumaDC.c @@ -0,0 +1,128 @@ +/** + * + * File Name: omxVCM4P10_InvTransformDequant_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_InvTransformDequant_LumaDC (6.3.5.6.3) + * + * Description: + * This function performs inverse 4x4 Hadamard transform and then dequantizes + * the coefficients. + * + * Input Arguments: + * + * pSrc - Pointer to the 4x4 array of the 4x4 Hadamard-transformed and + * quantized coefficients. 16 byte alignment required. + * iQP - Quantization parameter; must be in the range [0,51]. + * + * Output Arguments: + * + * pDst - Pointer to inverse-transformed and dequantized 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: pSrc + * - pSrc or pDst is not aligned on a 16-byte boundary + * + */ +OMXResult omxVCM4P10_InvTransformDequant_LumaDC( + const OMX_S16* pSrc, + OMX_S16* pDst, + OMX_U32 iQP +) +{ + OMX_INT i, j; + OMX_S32 m1[4][4], m2[4][4], Value; + OMX_S32 QPer, V; + + /* check for argument error */ + armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr) + armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr) + armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr) + armRetArgErrIf(armNot16ByteAligned(pSrc), OMX_Sts_BadArgErr) + armRetArgErrIf(armNot16ByteAligned(pDst), OMX_Sts_BadArgErr) + + /* Inv Hadamard Transform for DC Luma 4x4 block */ + /* Horizontal */ + for (i = 0; i < 4; i++) + { + j = i * 4; + + m1[i][0] = pSrc[j + 0] + pSrc[j + 2]; /* a+c */ + m1[i][1] = pSrc[j + 1] + pSrc[j + 3]; /* b+d */ + m1[i][2] = pSrc[j + 0] - pSrc[j + 2]; /* a-c */ + m1[i][3] = pSrc[j + 1] - pSrc[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]; + } + + + /* Scaling */ + QPer = iQP / 6; + V = armVCM4P10_VMatrix [iQP % 6][0]; + + for (j = 0; j < 4; j++) + { + for (i = 0; i < 4; i++) + { + if (QPer < 2) + { + Value = (m2[j][i] * V + (1 << (1 - QPer))) >> (2 - QPer); + } + else + { + Value = m2[j][i] * V * (1 << (QPer - 2)); + } + + pDst[j * 4 + i] = (OMX_S16) Value; + + } + } + return OMX_Sts_NoErr; +} + +/***************************************************************************** + * END OF FILE + *****************************************************************************/ + |