mp4eblck.c

Intel提供的在PCA(例如Sitsang开发板)使用IPP4.0库的MPEG-4编码源程序

/******************************************************************************
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//        Copyright (c) 2003 Intel Corporation. All Rights Reserved.
//
//  Description:    Block encoding functions of MPEG-4 video encoder sample
//                  code for Intel(R) Integrated Performance Primitives.
//  Functions List:
//		encode_block_intra_mpeg4()
//		encode_block_inter_mpeg4()
//		acdc_prediction_intra_mb_mpeg4()
******************************************************************************/

#include <memory.h>
#include "sampmp4.h"

/******************************************************************************
//
// Name:            encode_block_intra_mpeg4
//
// Description:     Quantize the DCT coefficients of the intra block and store
//                  them into buffer. Meanwhile, the texture data are
//                  reconstructed.
//
// Input Arguments:	
//		src_block	- Pointer to the pixels of current intra block.
//		blk_indx	- Block index indicating the component type and position as
//					  defined in subclause 6.1.3.8, Figure 6-5 of ISO/IEC
//                    14496-2.
//		cur_qp		- Quantization parameter of the macroblock which the
//					  current block belongs to.
//		step		- Width of the source and reconstructed plane.
//		q_matrix	- If the second inverse quantization method is used,  it is
//                    NULL; If the first inverse quantization method is used,
//                    it points to the quantization weighting coefficients
//                    buffer (for intra MB), whose first 64 elements are the
//                    quantization weighting matrix in Q0, the second 64
//                    elements are their reciprocals in Q21.
//
// Output Arguments:	
//      dst_coeff	- Pointer to the quantized DCT coefficients buffer.
//      rec_block	- Pointer to the reconstructed texture.
//
// Returns:
//      SAMPLE_STATUS_NOERR		- If succeeds.
//      SAMPLE_STATUS_ERR       - If encoding fails.
//	
*********************************************************************************/
sample_status encode_block_intra_mpeg4(Ipp8u     *src_block,
                                       Ipp8u     *rec_block,
                                       Ipp16s    *dst_coeff,                                       
                                       int       blk_indx,
                                       Ipp8u     cur_qp,
                                       int       step,                                       
                                       const int *q_matrix)
{
    Ipp8u   q_matrix_8u[SAMPLE_VIDEO_BLOCK_SQUARE_SIZE];
    Ipp16s  dct_coef_buf[SAMPLE_VIDEO_BLOCK_SQUARE_SIZE + 8];
    Ipp16s* dct_coef = (Ipp16s*)SAMPLE_ALIGN8(dct_coef_buf);
    int     i;
    IppVideoComponent video_comp;
    sample_status     ret_code;

    /* 1. DCT transform */
    /* src_block, dct_coef must be 8 bytes aligned */
    ret_code = ippiDCT8x8Fwd_Video_8u16s_C1R(src_block, step, dct_coef);
    if (ippStsNoErr != ret_code) {
        return SAMPLE_STATUS_ERR;
    }

    /* 2. Quantisation */
    ret_code = ippiQuantIntra_MPEG4_16s_I(dct_coef, cur_qp, blk_indx, q_matrix);
    if (ippStsNoErr != ret_code) {
        return SAMPLE_STATUS_ERR;
    } else {
        memcpy((void*)dst_coeff, (void*)dct_coef, sizeof(Ipp16s) * 64);
    }

    /* 3. Inverse Quantisation */
    video_comp = (Y_BLOCK4 >= blk_indx) ? IPP_VIDEO_LUMINANCE
        : IPP_VIDEO_CHROMINANCE;
    if (q_matrix) {
        for (i = 0; i < SAMPLE_VIDEO_BLOCK_SQUARE_SIZE; i++) {
            q_matrix_8u[i] = (Ipp8u)q_matrix[i];
        }
        ret_code = ippiQuantInvIntra_MPEG4_16s_I(dct_coef, cur_qp, q_matrix_8u,
            video_comp);
    } else {
        ret_code = ippiQuantInvIntra_MPEG4_16s_I(dct_coef, cur_qp, NULL,
            video_comp);
    }
    
    if (ippStsNoErr != ret_code) {
        return SAMPLE_STATUS_ERR;
    }

    /* 4. IDCT */
    /* dct_coef, rec_block must be 8 bytes aligned */
    ret_code = ippiDCT8x8Inv_Video_16s8u_C1R(dct_coef, rec_block, step);
    if (ippStsNoErr != ret_code) {
        return SAMPLE_STATUS_ERR;
    }
    
    return SAMPLE_STATUS_NOERR;
}

/******************************************************************************
//
// Name:            acdc_prediction_intra_mb_mpeg4
//
// Description:     Implement the AC/DC coefficients prediction of the intra
//					macroblock 
//
// Input Arguments:	
//		src_dst_coeff	- Pointer to the macroblock quantized DCT coefficient
//                        buffer before AC/DC prediction.
//      coef_bufrow_y   - Pointer to the y coefficient row buffer
//      coef_bufcol_y   - Pointer to the y coefficient column buffer
//      coef_bufrow_cb  - Pointer to the cb coefficient row buffer
//      coef_bufcol_cb  - Pointer to the cb coefficient column buffer
//      coef_bufrow_cr  - Pointer to the cr coefficient row buffer
//      coef_bufcol_cr  - Pointer to the cr coefficient column buffer
//		cur_qp		    - Quantization parameter of the current macroblock.
//      qp_buf          - Pointer to the quantization parameter buffer which
//                        contains the quantization parameter of neighbouring
//                        macroblocks.
// Output Arguments:
//      src_dst_coeff   - Pointer to the macroblock coefficient buffer after
//                        AC/DC prediction.	
//      ac_pred_flag	- Pointer to the ac_pred_flag of the intra macroblock
//      pred_dir_buf	- Pointer to the predict direction buffer for all six
//                        blocks in the macroblock
//      coef_bufrow_y   - Pointer to the updated y coefficient row buffer
//      coef_bufcol_y   - Pointer to the updated y coefficient column buffer
//      coef_bufrow_cb  - Pointer to the updated cb coefficient row buffer
//      coef_bufcol_cb  - Pointer to the updated cb coefficient column buffer
//      coef_bufrow_cr  - Pointer to the updated cr coefficient row buffer
//      coef_bufcol_cr  - Pointer to the updated cr coefficient column buffer
//
// Returns:
//      SAMPLE_STATUS_NOERR		- If succeeds.
//	
*********************************************************************************/
sample_status acdc_prediction_intra_mb_mpeg4(Ipp16s *src_dst_coeff,
                                             Ipp16s *coef_bufrow_y,
                                             Ipp16s *coef_bufcol_y,
                                             Ipp16s *coef_bufrow_cb,
                                             Ipp16s *coef_bufcol_cb,
                                             Ipp16s *coef_bufrow_cr,
                                             Ipp16s *coef_bufcol_cr,
                                             Ipp8u  cur_qp,
                                             Ipp8u  *qp_buf,                                             
                                             int    *ac_pred_flag,
                                             Ipp8u  *pred_dir_buf)
{
    Ipp8u   pred_qp;
    Ipp16s  tmp_coef, dc_coef, *coef, *coef_bufrow = NULL, *coef_bufcol = NULL;
    Ipp16s  pred_buf[SAMPLE_VIDEO_BLOCK_SIZE * 6];
    int     dc_left, dc_top, dc_left_top;
    int     dc_scaler_lum, dc_scaler_chr, dc_scaler = 0;
    int     i, j, pred_dir, blk_indx, sum_err, level;

    /* Calculate dc_scaler */
    /* Please refer to Table 7-1 ISC/IEC 14496-2:2001(E) */
    if (5 > cur_qp) {
        dc_scaler_lum = 8;
        dc_scaler_chr = 8;
    } else if (9 > cur_qp) {
        dc_scaler_lum = cur_qp * 2;
        dc_scaler_chr = (cur_qp + 13) / 2;
    } else if (25 > cur_qp) {
        dc_scaler_lum = cur_qp + 8;
        dc_scaler_chr = (cur_qp + 13) / 2;
    } else {
        dc_scaler_lum = 2 * cur_qp - 16;
        dc_scaler_chr = cur_qp - 6;
    }

    sum_err  = 0;
    for (blk_indx = Y_BLOCK1; blk_indx <= V_BLOCK; blk_indx ++) {
        switch (blk_indx) {
        case Y_BLOCK1:
            coef_bufrow = coef_bufrow_y;
            coef_bufcol = coef_bufcol_y;
            dc_scaler   = dc_scaler_lum;
            break;
        case Y_BLOCK2:
            coef_bufrow = coef_bufrow_y + SAMPLE_VIDEO_BLOCK_SIZE;
            coef_bufcol = coef_bufcol_y;
            dc_scaler   = dc_scaler_lum;
            break;
        case Y_BLOCK3:
            coef_bufrow = coef_bufrow_y;
            coef_bufcol = coef_bufcol_y + SAMPLE_VIDEO_BLOCK_SIZE;
            dc_scaler   = dc_scaler_lum;
            break;
        case Y_BLOCK4:
            coef_bufrow = coef_bufrow_y + SAMPLE_VIDEO_BLOCK_SIZE;
            coef_bufcol = coef_bufcol_y + SAMPLE_VIDEO_BLOCK_SIZE;
            dc_scaler   = dc_scaler_lum;
            break;
        case U_BLOCK:
            coef_bufrow = coef_bufrow_cb;
            coef_bufcol = coef_bufcol_cb;
            dc_scaler   = dc_scaler_chr;
            break;
        case V_BLOCK:
            coef_bufrow = coef_bufrow_cr;
            coef_bufcol = coef_bufcol_cr;
            dc_scaler   = dc_scaler_chr;
            break;
        }
        coef = src_dst_coeff + blk_indx * 64;

        /* 1. AC/DC precition direction */
        dc_top      = (0 > coef_bufrow[0])  ? 1024 : coef_bufrow[0];
        dc_left     = (0 > coef_bufrow[-8]) ? 1024 : coef_bufrow[-8];
        dc_left_top = (0 > coef_bufcol[0])  ? 1024 : coef_bufcol[0];

        pred_qp = cur_qp;

        if (ABS_MP4(dc_left_top - dc_left) < ABS_MP4(dc_left_top - dc_top)) {
            
            pred_dir = IPP_VIDEO_VERTICAL;
            if ((0 <= coef_bufrow[0]) && (Y_BLOCK3 != blk_indx)
                && (Y_BLOCK4 != blk_indx)) {
                /* the reference block is from the top macro block */
                pred_qp = qp_buf[1];
            }
        } else {
            
            pred_dir = IPP_VIDEO_HORIZONTAL;
            if ((0 <= coef_bufrow[-8]) && (Y_BLOCK2 != blk_indx)
                && (Y_BLOCK4 != blk_indx)) {
                /* the reference block is from the left macro block */
                pred_qp = qp_buf[0];
            }
        }

        /* 2. AC prediction precalculation */
        if (IPP_VIDEO_VERTICAL == pred_dir && MPEG4_PRED_DISABLE != sum_err) {
            
            if (0 > coef_bufrow[0]) {
                pred_buf[blk_indx * 8] = 2;
            } else {
                pred_buf[blk_indx * 8] = 3;