roqvideo.c

arm平台下的H264编码和解码源代码

/*
 * Copyright (C) 2003 the ffmpeg project
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/**
 * @file roqvideo.c
 * Id RoQ Video Decoder by Dr. Tim Ferguson
 * For more information about the Id RoQ format, visit:
 *   http://www.csse.monash.edu.au/~timf/
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "common.h"
#include "avcodec.h"
#include "dsputil.h"

typedef struct {
  unsigned char y0, y1, y2, y3, u, v;
} roq_cell;

typedef struct {
  int idx[4];
} roq_qcell;

static int uiclip[1024], *uiclp;  /* clipping table */
#define avg2(a,b) uiclp[(((int)(a)+(int)(b)+1)>>1)]
#define avg4(a,b,c,d) uiclp[(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)]

typedef struct RoqContext {

    AVCodecContext *avctx;
    DSPContext dsp;
    AVFrame last_frame;
    AVFrame current_frame;
    int first_frame;
    int y_stride;
    int c_stride;

    roq_cell cells[256];
    roq_qcell qcells[256];

    unsigned char *buf;
    int size;

} RoqContext;

#define RoQ_INFO              0x1001
#define RoQ_QUAD_CODEBOOK     0x1002
#define RoQ_QUAD_VQ           0x1011
#define RoQ_SOUND_MONO        0x1020
#define RoQ_SOUND_STEREO      0x1021

#define RoQ_ID_MOT              0x00
#define RoQ_ID_FCC              0x01
#define RoQ_ID_SLD              0x02
#define RoQ_ID_CCC              0x03

#define get_byte(in_buffer) *(in_buffer++)
#define get_word(in_buffer) ((unsigned short)(in_buffer += 2, \
  (in_buffer[-1] << 8 | in_buffer[-2])))
#define get_long(in_buffer) ((unsigned long)(in_buffer += 4, \
  (in_buffer[-1] << 24 | in_buffer[-2] << 16 | in_buffer[-3] << 8 | in_buffer[-4])))


static void apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
{
    unsigned char *yptr;

    yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
    *yptr++ = cell->y0;
    *yptr++ = cell->y1;
    yptr += (ri->y_stride - 2);
    *yptr++ = cell->y2;
    *yptr++ = cell->y3;
    ri->current_frame.data[1][(y/2) * (ri->c_stride) + x/2] = cell->u;
    ri->current_frame.data[2][(y/2) * (ri->c_stride) + x/2] = cell->v;
}

static void apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
{
    unsigned long row_inc, c_row_inc;
    register unsigned char y0, y1, u, v;
    unsigned char *yptr, *uptr, *vptr;

    yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
    uptr = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
    vptr = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;

    row_inc = ri->y_stride - 4;
    c_row_inc = (ri->c_stride) - 2;
    *yptr++ = y0 = cell->y0; *uptr++ = u = cell->u; *vptr++ = v = cell->v;
    *yptr++ = y0;
    *yptr++ = y1 = cell->y1; *uptr++ = u; *vptr++ = v;
    *yptr++ = y1;

    yptr += row_inc;

    *yptr++ = y0;
    *yptr++ = y0;
    *yptr++ = y1;
    *yptr++ = y1;

    yptr += row_inc; uptr += c_row_inc; vptr += c_row_inc;

    *yptr++ = y0 = cell->y2; *uptr++ = u; *vptr++ = v;
    *yptr++ = y0;
    *yptr++ = y1 = cell->y3; *uptr++ = u; *vptr++ = v;
    *yptr++ = y1;

    yptr += row_inc;

    *yptr++ = y0;
    *yptr++ = y0;
    *yptr++ = y1;
    *yptr++ = y1;
}

static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
    signed char mean_x, signed char mean_y)
{
    int i, hw, mx, my;
    unsigned char *pa, *pb;

    mx = x + 8 - (mv >> 4) - mean_x;
    my = y + 8 - (mv & 0xf) - mean_y;

    pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
    pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
    for(i = 0; i < 4; i++) {
        pa[0] = pb[0];
        pa[1] = pb[1];
        pa[2] = pb[2];
        pa[3] = pb[3];
        pa += ri->y_stride;
        pb += ri->y_stride;
    }

#if 0
    pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
    pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
    for(i = 0; i < 2; i++) {
        pa[0] = pb[0];
        pa[1] = pb[1];
        pa += ri->c_stride;
        pb += ri->c_stride;
    }

    pa = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
    pb = ri->last_frame.data[2] + (my/2) * (ri->c_stride) + (mx + 1)/2;
    for(i = 0; i < 2; i++) {
        pa[0] = pb[0];
        pa[1] = pb[1];
        pa += ri->c_stride;
        pb += ri->c_stride;
    }
#else
    hw = ri->y_stride/2;
    pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
    pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;

    for(i = 0; i < 2; i++) {
        switch(((my & 0x01) << 1) | (mx & 0x01)) {

        case 0:
            pa[0] = pb[0];
            pa[1] = pb[1];
            pa[hw] = pb[hw];
            pa[hw+1] = pb[hw+1];
            break;

        case 1:
            pa[0] = avg2(pb[0], pb[1]);
            pa[1] = avg2(pb[1], pb[2]);
            pa[hw] = avg2(pb[hw], pb[hw+1]);
            pa[hw+1] = avg2(pb[hw+1], pb[hw+2]);
            break;

        case 2:
            pa[0] = avg2(pb[0], pb[hw]);
            pa[1] = avg2(pb[1], pb[hw+1]);
            pa[hw] = avg2(pb[hw], pb[hw*2]);
            pa[hw+1] = avg2(pb[hw+1], pb[(hw*2)+1]);
            break;

        case 3:
            pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
            pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
            pa[hw] = avg4(pb[hw], pb[hw+1], pb[hw*2], pb[(hw*2)+1]);
            pa[hw+1] = avg4(pb[hw+1], pb[hw+2], pb[(hw*2)+1], pb[(hw*2)+1]);
            break;
        }

        pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
        pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
    }
#endif
}

static void apply_motion_8x8(RoqContext *ri, int x, int y,
    unsigned char mv, signed char mean_x, signed char mean_y)
{
    int mx, my, i, j, hw;
    unsigned char *pa, *pb;

    mx = x + 8 - (mv >> 4) - mean_x;
    my = y + 8 - (mv & 0xf) - mean_y;

    pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
    pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
    for(i = 0; i < 8; i++) {
        pa[0] = pb[0];
        pa[1] = pb[1];
        pa[2] = pb[2];
        pa[3] = pb[3];
        pa[4] = pb[4];
        pa[5] = pb[5];
        pa[6] = pb[6];
        pa[7] = pb[7];
        pa += ri->y_stride;
        pb += ri->y_stride;
    }

#if 0
    pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
    pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
    for(i = 0; i < 4; i++) {
        pa[0] = pb[0];
        pa[1] = pb[1];
        pa[2] = pb[2];
        pa[3] = pb[3];
        pa += ri->c_stride;
        pb += ri->c_stride;