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Diffstat (limited to 'media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c')
-rw-r--r-- | media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c new file mode 100644 index 0000000..d047942 --- /dev/null +++ b/media/libstagefright/codecs/on2/h264dec/omxdl/reference/vc/m4p2/src/omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c @@ -0,0 +1,97 @@ +/** + * + * File Name: omxVCM4P2_EncodeVLCZigzag_IntraACVLC.c + * OpenMAX DL: v1.0.2 + * Revision: 9641 + * Date: Thursday, February 7, 2008 + * + * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. + * + * + * + * Description: + * Contains modules for zigzag scanning and VLC encoding + * for intra block. + * + */ + +#include "omxtypes.h" +#include "armOMX.h" +#include "omxVC.h" + +#include "armVC.h" + + +/** + * Function: omxVCM4P2_EncodeVLCZigzag_IntraACVLC (6.2.4.5.2) + * + * Description: + * Performs zigzag scan and VLC encoding of AC and DC coefficients for one + * intra block. Two versions of the function (DCVLC and ACVLC) are provided + * in order to support the two different methods of processing DC + * coefficients, as described in [ISO14496-2], subclause 7.4.1.4, Intra DC + * Coefficient Decoding for the Case of Switched VLC Encoding. + * + * Input Arguments: + * + * ppBitStream - double pointer to the current byte in the bitstream + * pBitOffset - pointer to the bit position in the byte pointed by + * *ppBitStream. Valid within 0 to 7. + * pQDctBlkCoef - pointer to the quantized DCT coefficient + * predDir - AC prediction direction, which is used to decide the zigzag + * scan pattern; takes one of the following values: + * - OMX_VC_NONE - AC prediction not used. + * Performs classical zigzag scan. + * - OMX_VC_HORIZONTAL - Horizontal prediction. + * Performs alternate-vertical zigzag scan. + * - OMX_VC_VERTICAL - Vertical prediction. + * Performs alternate-horizontal zigzag scan. + * pattern - block pattern which is used to decide whether this block is + * encoded + * 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. + * + * Output Arguments: + * + * ppBitStream - *ppBitStream is updated after the block is encoded, so + * that it points to the current byte in the bit stream buffer. + * pBitOffset - *pBitOffset is updated so that it points to the current bit + * position in the byte pointed by *ppBitStream. + * + * Return Value: + * + * OMX_Sts_NoErr - no error + * OMX_Sts_BadArgErr - Bad arguments: + * - At least one of the following pointers is NULL: ppBitStream, + * *ppBitStream, pBitOffset, pQDctBlkCoef. + * - *pBitOffset < 0, or *pBitOffset >7. + * - PredDir is not one of: OMX_VC_NONE, OMX_VC_HORIZONTAL, or + * OMX_VC_VERTICAL. + * - VideoComp is not one component of enum OMXVCM4P2VideoComponent. + * + */ + +OMXResult omxVCM4P2_EncodeVLCZigzag_IntraACVLC( + OMX_U8 **ppBitStream, + OMX_INT *pBitOffset, + const OMX_S16 *pQDctBlkCoef, + OMX_U8 predDir, + OMX_U8 pattern, + OMX_INT shortVideoHeader +) +{ + OMX_U8 start = 0; + + return armVCM4P2_EncodeVLCZigzag_Intra( + ppBitStream, + pBitOffset, + pQDctBlkCoef, + predDir, + pattern, + shortVideoHeader, + start); +} + +/* End of file */ |