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mpeg4.c
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mpeg4.c
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/*
* Copyright (c) 2013 Jens Kuske <jenskuske@gmail.com>
*
* 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 2.1 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <string.h>
#include "vdpau_private.h"
#include "ve.h"
#include "veisp.h"
#include <time.h>
#include <assert.h>
#include "bitstream.h"
#include "mpeg4.h"
#include "stdlib.h"
#include "mp4_vars.h"
#include <stdio.h>
#include <unistd.h>
#define TIMEMEAS 0
#define USE_ISP_HW 0
#define USE_XY_CONV 0
#define USE_DISP_HW 1
#define USE_ISP_SW 0
static int mpeg4_calcResyncMarkerLength(mp4_private_t *decoder_p);
uint32_t show_bits_aligned(bitstream *bs, int n, int aligned);
// shapes
#define RECT_SHAPE 0
#define BIN_SHAPE 1
#define BIN_ONLY_SHAPE 2
#define GRAY_SHAPE 3
// aspect_ratio_info
#define EXTENDED_PAR 15
//vol_sprite_usage / sprite_enable
#define STATIC_SPRITE 1
#define GMC_SPRITE 2
static int find_startcode(bitstream *bs)
{
unsigned int pos, zeros = 0;
for (pos = bs->bitpos / 8; pos < bs->length; pos++)
{
if (bs->data[pos] == 0x00)
zeros++;
else if (bs->data[pos] == 0x01 && zeros >= 2)
{
bs->bitpos = (pos + 1) * 8;
return 1;
}
else
zeros = 0;
}
return 0;
}
uint32_t show_bits(bitstream *bs, int n)
{
return show_bits_aligned(bs, n, 0);
#if 0
uint32_t bits = 0;
int remaining_bits = n;
int save_bitpos = bs->bitpos;
while (remaining_bits > 0)
{
int bits_in_current_byte = 8 - (bs->bitpos & 7);
int trash_bits = 0;
if (remaining_bits < bits_in_current_byte)
trash_bits = bits_in_current_byte - remaining_bits;
int useful_bits = bits_in_current_byte - trash_bits;
bits = (bits << useful_bits) | (bs->data[bs->bitpos / 8] >> trash_bits);
remaining_bits -= useful_bits;
bs->bitpos += useful_bits;
}
bs->bitpos = save_bitpos;
return bits & ((1 << n) - 1);
#endif
}
uint32_t show_bits_aligned(bitstream *bs, int n, int aligned)
{
uint32_t bits = 0;
int remaining_bits = n;
int bitpos;
if(aligned)
bitpos = (bs->bitpos+7) & ~7;
else
bitpos = bs->bitpos;
while (remaining_bits > 0)
{
int bits_in_current_byte = 8 - (bs->bitpos & 7);
int trash_bits = 0;
if (remaining_bits < bits_in_current_byte)
trash_bits = bits_in_current_byte - remaining_bits;
int useful_bits = bits_in_current_byte - trash_bits;
bits = (bits << useful_bits) | (bs->data[bitpos / 8] >> trash_bits);
remaining_bits -= useful_bits;
bitpos += useful_bits;
}
return bits & ((1 << n) - 1);
}
uint32_t get_bits(bitstream *bs, int n)
{
uint32_t bits = 0;
int remaining_bits = n;
while (remaining_bits > 0)
{
int bits_in_current_byte = 8 - (bs->bitpos & 7);
int trash_bits = 0;
if (remaining_bits < bits_in_current_byte)
trash_bits = bits_in_current_byte - remaining_bits;
int useful_bits = bits_in_current_byte - trash_bits;
bits = (bits << useful_bits) | (bs->data[bs->bitpos / 8] >> trash_bits);
remaining_bits -= useful_bits;
bs->bitpos += useful_bits;
}
return bits & ((1 << n) - 1);
}
int bytealign(bitstream *bs)
{
bs->bitpos = ((bs->bitpos+7) >> 3) << 3;
if(bs->bitpos > bs->length * 8)
{
bs->bitpos = bs->length * 8;
return 1;
}
return 0;
}
int bytealigned(bitstream *bs, int nbit)
{
return (((bs->bitpos + nbit) % 8) == 0);
}
void flush_bits(bitstream *bs, int nbit)
{
bs->bitpos += nbit;
}
int bits_left(bitstream *bs)
{
return(bs->bitpos/8 < bs->length);
}
int nextbits_bytealigned(bitstream *bs, int nbit)
{
int code;
int skipcnt = 0;
if (bytealigned(bs, skipcnt))
{
// stuffing bits
if (show_bits(bs, 8) == 127) {
skipcnt += 8;
}
}
else
{
// bytealign
while (! bytealigned(bs, skipcnt)) {
skipcnt += 1;
}
}
code = show_bits(bs, nbit + skipcnt);
return ((code << skipcnt) >> skipcnt);
}
int decode012(bitstream *bs)
{
int n;
n = get_bits(bs, 1);
if (n == 0)
return 0;
else
return get_bits(bs, 1) + 1;
}
static void dumpData(char* data)
{
int pos=0;
printf("data[%d]=%X data[+1]=%X data[+2]=%X data[+3]=%X data[+4]=%X\n",
pos, data[pos], data[pos+1], data[pos+2], data[pos+3],data[pos+4]);
}
static int find_resynccode(bitstream *bs, int resync_length)
{
unsigned int pos;
bytealign(bs);
for (pos = bs->bitpos / 8; pos < bs->length; pos++)
{
if(bs->data[pos])
continue;
bs->bitpos = pos * 8;
int resync_code = show_bits(bs, resync_length);
if(resync_code == 1)
return 1;
}
return 0;
}
static void mp4_private_free(decoder_ctx_t *decoder)
{
mp4_private_t *decoder_p = (mp4_private_t *)decoder->private;
cedarv_free(decoder_p->mbh_buffer);
cedarv_free(decoder_p->dcac_buffer);
cedarv_free(decoder_p->ncf_buffer);
free(decoder_p);
}
static VLCtabMb MCBPCtabIntra[] = {
{-1,0},
{20,6}, {36,6}, {52,6}, {4,4}, {4,4}, {4,4},
{4,4}, {19,3}, {19,3}, {19,3}, {19,3}, {19,3},
{19,3}, {19,3}, {19,3}, {35,3}, {35,3}, {35,3},
{35,3}, {35,3}, {35,3}, {35,3}, {35,3}, {51,3},
{51,3}, {51,3}, {51,3}, {51,3}, {51,3}, {51,3},
{51,3},
};
static VLCtabMb MCBPCtabInter[] = {
{-1,0},
{255,9}, {52,9}, {36,9}, {20,9}, {49,9}, {35,8}, {35,8}, {19,8}, {19,8},
{50,8}, {50,8}, {51,7}, {51,7}, {51,7}, {51,7}, {34,7}, {34,7}, {34,7},
{34,7}, {18,7}, {18,7}, {18,7}, {18,7}, {33,7}, {33,7}, {33,7}, {33,7},
{17,7}, {17,7}, {17,7}, {17,7}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6},
{4,6}, {4,6}, {4,6}, {48,6}, {48,6}, {48,6}, {48,6}, {48,6}, {48,6},
{48,6}, {48,6}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5},
{3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5}, {3,5},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {32,4},
{32,4}, {32,4}, {32,4}, {32,4}, {32,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4}, {16,4},
{16,4}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3}, {2,3},
{2,3}, {2,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3}, {1,3},
{1,3}, {1,3}, {1,3},
};
static VLCtabMb CBPYtab[48] =
{
{-1,0}, {-1,0}, {6,6}, {9,6}, {8,5}, {8,5}, {4,5}, {4,5},
{2,5}, {2,5}, {1,5}, {1,5}, {0,4}, {0,4}, {0,4}, {0,4},
{12,4}, {12,4}, {12,4}, {12,4}, {10,4}, {10,4}, {10,4}, {10,4},
{14,4}, {14,4}, {14,4}, {14,4}, {5,4}, {5,4}, {5,4}, {5,4},
{13,4}, {13,4}, {13,4}, {13,4}, {3,4}, {3,4}, {3,4}, {3,4},
{11,4}, {11,4}, {11,4}, {11,4}, {7,4}, {7,4}, {7,4}, {7,4},
};
static int DQtab[4] = {
-1, -2, 1, 2
};
static VLCtabMb MVtab0[] =
{
{3,4}, {-3,4}, {2,3}, {2,3}, {-2,3}, {-2,3}, {1,2}, {1,2}, {1,2}, {1,2},
{-1,2}, {-1,2}, {-1,2}, {-1,2}
};
static VLCtabMb MVtab1[] =
{
{12,10}, {-12,10}, {11,10}, {-11,10}, {10,9}, {10,9}, {-10,9}, {-10,9},
{9,9}, {9,9}, {-9,9}, {-9,9}, {8,9}, {8,9}, {-8,9}, {-8,9}, {7,7}, {7,7},
{7,7}, {7,7}, {7,7}, {7,7}, {7,7}, {7,7}, {-7,7}, {-7,7}, {-7,7}, {-7,7},
{-7,7}, {-7,7}, {-7,7}, {-7,7}, {6,7}, {6,7}, {6,7}, {6,7}, {6,7}, {6,7},
{6,7}, {6,7}, {-6,7}, {-6,7}, {-6,7}, {-6,7}, {-6,7}, {-6,7}, {-6,7},
{-6,7}, {5,7}, {5,7}, {5,7}, {5,7}, {5,7}, {5,7}, {5,7}, {5,7}, {-5,7},
{-5,7}, {-5,7}, {-5,7}, {-5,7}, {-5,7}, {-5,7}, {-5,7}, {4,6}, {4,6}, {4,6},
{4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6}, {4,6},
{4,6}, {4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6},
{-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}, {-4,6}
};
static VLCtabMb MVtab2[] =
{
{32,12}, {-32,12}, {31,12}, {-31,12}, {30,11}, {30,11}, {-30,11}, {-30,11},
{29,11}, {29,11}, {-29,11}, {-29,11}, {28,11}, {28,11}, {-28,11}, {-28,11},
{27,11}, {27,11}, {-27,11}, {-27,11}, {26,11}, {26,11}, {-26,11}, {-26,11},
{25,11}, {25,11}, {-25,11}, {-25,11}, {24,10}, {24,10}, {24,10}, {24,10},
{-24,10}, {-24,10}, {-24,10}, {-24,10}, {23,10}, {23,10}, {23,10}, {23,10},
{-23,10}, {-23,10}, {-23,10}, {-23,10}, {22,10}, {22,10}, {22,10}, {22,10},
{-22,10}, {-22,10}, {-22,10}, {-22,10}, {21,10}, {21,10}, {21,10}, {21,10},
{-21,10}, {-21,10}, {-21,10}, {-21,10}, {20,10}, {20,10}, {20,10}, {20,10},
{-20,10}, {-20,10}, {-20,10}, {-20,10}, {19,10}, {19,10}, {19,10}, {19,10},
{-19,10}, {-19,10}, {-19,10}, {-19,10}, {18,10}, {18,10}, {18,10}, {18,10},
{-18,10}, {-18,10}, {-18,10}, {-18,10}, {17,10}, {17,10}, {17,10}, {17,10},
{-17,10}, {-17,10}, {-17,10}, {-17,10}, {16,10}, {16,10}, {16,10}, {16,10},
{-16,10}, {-16,10}, {-16,10}, {-16,10}, {15,10}, {15,10}, {15,10}, {15,10},
{-15,10}, {-15,10}, {-15,10}, {-15,10}, {14,10}, {14,10}, {14,10}, {14,10},
{-14,10}, {-14,10}, {-14,10}, {-14,10}, {13,10}, {13,10}, {13,10}, {13,10},
{-13,10}, {-13,10}, {-13,10}, {-13,10}
};
static int get_gob_height(int height)
{
int gob_height;
if(height <= 400)
gob_height = 1;
else if(height <= 800)
gob_height = 2;
else
gob_height = 4;
return gob_height;
}
static int getMCBPC(bitstream *bs, mp4_private_t *priv)
{
vop_header_t *h = &priv->vop_header;
if (h->vop_coding_type == VOP_I)
{
int code = show_bits(bs, 9);
if (code == 1) {
get_bits(bs, 9); // stuffing
return 0;
}
else if (code < 8) {
return -1;
}
code >>= 3;
if (code >= 32) {
get_bits(bs, 1);
return 3;
}
get_bits(bs, MCBPCtabIntra[code].len);
return MCBPCtabIntra[code].val;
}
else
{
int code = show_bits(bs, 9);
if (code == 1) {
get_bits(bs, 9); // stuffing
return 0;
}
else if (code == 0) {
return -1;
}
if (code >= 256)
{
get_bits(bs, 1);
return 0;
}
get_bits(bs, MCBPCtabInter[code].len);
return MCBPCtabInter[code].val;
}
}
static int getCBPY(bitstream *bs, mp4_private_t *priv)
{
vop_header_t *h = &priv->vop_header;
int cbpy;
int code = show_bits(bs, 6);
if (code < 2) {
return -1;
}
if (code >= 48) {
get_bits(bs,2);
cbpy = 15;
} else {
get_bits(bs, CBPYtab[code].len);
cbpy = CBPYtab[code].val;
}
if (!((h->derived_mb_type == 3) ||
(h->derived_mb_type == 4)))
cbpy = 15 - cbpy;
return cbpy;
}
static int getMVdata(bitstream *bs, mp4_private_t *priv)
{
int code;
if (get_bits(bs, 1)) {
return 0; // hor_mv_data == 0
}
code = show_bits(bs, 12);
if (code >= 512)
{
code = (code >> 8) - 2;
get_bits(bs, MVtab0[code].len);
return MVtab0[code].val;
}
if (code >= 128)
{
code = (code >> 2) - 32;
get_bits(bs, MVtab1[code].len);
return MVtab1[code].val;
}
code -= 4;
assert(code >= 0);
get_bits(bs, MVtab2[code].len);
return MVtab2[code].val;
}
static int find_pmv (bitstream *bs, mp4_private_t *priv, int block, int comp)
{
int p1, p2, p3;
int xin1, xin2, xin3;
int yin1, yin2, yin3;
int vec1, vec2, vec3;
video_packet_header_t *vp = &priv->pkt_hdr;
int x = vp->mb_xpos;
int y = vp->mb_ypos;
if ((y == 0) && ((block == 0) || (block == 1)))
{
if ((x == 0) && (block == 0))
return 0;
else if (block == 1)
return priv->MV[comp][0][y+1][x+1];
else // block == 0
return priv->MV[comp][1][y+1][x+1-1];
}
else
{
// considerate border (avoid increment inside each single array index)
x++;
y++;
switch (block)
{
case 0:
vec1 = 1; yin1 = y; xin1 = x-1;
vec2 = 2; yin2 = y-1; xin2 = x;
vec3 = 2; yin3 = y-1; xin3 = x+1;
break;
case 1:
vec1 = 0; yin1 = y; xin1 = x;
vec2 = 3; yin2 = y-1; xin2 = x;
vec3 = 2; yin3 = y-1; xin3 = x+1;
break;
case 2:
vec1 = 3; yin1 = y; xin1 = x-1;
vec2 = 0; yin2 = y; xin2 = x;
vec3 = 1; yin3 = y; xin3 = x;
break;
default: // case 3
vec1 = 2; yin1 = y; xin1 = x;
vec2 = 0; yin2 = y; xin2 = x;
vec3 = 1; yin3 = y; xin3 = x;
break;
}
p1 = priv->MV[comp][vec1][yin1][xin1];
p2 = priv->MV[comp][vec2][yin2][xin2];
p3 = priv->MV[comp][vec3][yin3][xin3];
// return p1 + p2 + p3 - mmax (p1, mmax (p2, p3)) - mmin (p1, mmin (p2, p3));
return mmin(mmax(p1, p2), mmin(mmax(p2, p3), mmax(p1, p3)));
}
}
static int setMV(bitstream *bs, mp4_private_t *priv, int block_num)
{
vop_header_t *h = &priv->vop_header;
video_packet_header_t* vp = &priv->pkt_hdr;
int hor_mv_data, ver_mv_data, hor_mv_res, ver_mv_res;
int scale_fac = 1 << (h->fcode_forward - 1);
int high = (32 * scale_fac) - 1;
int low = ((-32) * scale_fac);
int range = (64 * scale_fac);
int mvd_x, mvd_y, pmv_x, pmv_y, mv_x, mv_y;
/***
[hor_mv_data]
if ((vop_fcode_forward != 1) && (hor_mv_data != 0))
[hor_mv_residual]
***/
hor_mv_data = getMVdata(bs, priv); // mv data
if ((scale_fac == 1) || (hor_mv_data == 0))
mvd_x = hor_mv_data;
else {
hor_mv_res = get_bits(bs, h->fcode_forward-1); // mv residual
mvd_x = ((abs(hor_mv_data) - 1) * scale_fac) + hor_mv_res + 1;
if (hor_mv_data < 0)
mvd_x = - mvd_x;
}
ver_mv_data = getMVdata(bs, priv);
if ((scale_fac == 1) || (ver_mv_data == 0))
mvd_y = ver_mv_data;
else {
ver_mv_res = get_bits(bs, h->fcode_forward-1);
mvd_y = ((abs(ver_mv_data) - 1) * scale_fac) + ver_mv_res + 1;
if (ver_mv_data < 0)
mvd_y = - mvd_y;
}
if (block_num == -1) {
pmv_x = find_pmv(bs, priv, 0, 0);
pmv_y = find_pmv(bs, priv, 0, 1);
}
else {
pmv_x = find_pmv(bs, priv, block_num, 0);
pmv_y = find_pmv(bs, priv, block_num, 1);
}
// _Print("Hor MotV Pred: %d\n", pmv_x);
// _Print("Ver MorV Pred: %d\n", pmv_y);
mv_x = pmv_x + mvd_x;
if (mv_x < low)
mv_x += range;
if (mv_x > high)
mv_x -= range;
mv_y = pmv_y + mvd_y;
if (mv_y < low)
mv_y += range;
if (mv_y > high)
mv_y -= range;
// put [mv_x, mv_y] in MV struct
if (block_num == -1) {
int i;
for (i = 0; i < 4; i++) {
priv->MV[0][i][vp->mb_ypos+1][vp->mb_xpos+1] = mv_x;
priv->MV[1][i][vp->mb_ypos+1][vp->mb_xpos+1] = mv_y;
}
}
else {
priv->MV[0][block_num][vp->mb_ypos+1][vp->mb_xpos+1] = mv_x;
priv->MV[1][block_num][vp->mb_ypos+1][vp->mb_xpos+1] = mv_y;
}
// _Print("Hor MotV: %d\n", mv_x);
// _Print("Ver MotV: %d\n", mv_y);
return 1;
}
static int macroblock(bitstream *bs, mp4_private_t *priv)
{
int j;
int intraFlag, interFlag;
vop_header_t *h = &priv->vop_header;
vol_header_t *vol = &priv->vol_header;
video_packet_header_t* vp = &priv->pkt_hdr;
// _Print("-Macroblock %d\n", mp4_state->hdr.mba);
// _Break(93, 426);
if(h->vop_coding_type != VOP_B) {
if(vol->video_object_layer_shape != BIN_ONLY_SHAPE) {
if (h->vop_coding_type != VOP_I)
h->not_coded = get_bits(bs, 1);
// coded macroblock or I-VOP
if (! h->not_coded || h->vop_coding_type == VOP_I) {
h->mcbpc = getMCBPC(bs, priv); // mcbpc
h->derived_mb_type = h->mcbpc & 7;
h->cbpc = (h->mcbpc >> 4) & 3;
#if 0
mp4_state->modemap[mp4_state->hdr.mb_ypos+1][mp4_state->hdr.mb_xpos+1] =
mp4_state->hdr.derived_mb_type; // [Review] used only in P-VOPs
#endif
intraFlag = ((h->derived_mb_type == INTRA) ||
(h->derived_mb_type == INTRA_Q)) ? 1 : 0;
interFlag = (! intraFlag);
if (intraFlag)
h->ac_pred_flag = get_bits(bs, 1);
if (h->derived_mb_type != STUFFING) {
h->cbpy = getCBPY(bs, priv); // cbpy
h->cbp = (h->cbpy << 2) | h->cbpc;
}
else
return 1;
// _Print("Mb type: %d\n", mp4_state->hdr.derived_mb_type);
// _Print("Pattern Chr: %d\n", mp4_state->hdr.cbpc);
// _Print("Pattern Luma: %d\n", mp4_state->hdr.cbpy);
if (h->derived_mb_type == INTER_Q ||
h->derived_mb_type == INTRA_Q) {
h->dquant = get_bits(bs, 2);
h->quantizer += DQtab[h->dquant];
if (h->quantizer > 31) {
h->quantizer = 31;
//printf("limiting quantizer to 31\n");
}
else if (h->quantizer < 1) {
h->quantizer = 1;
//printf("limiting quantizer to 1\n");
}
}
if (h->derived_mb_type == INTER ||
h->derived_mb_type == INTER_Q) {
setMV(bs, priv, -1); // mv
}
else if (h->derived_mb_type == INTER4V) {
#if 1
for (j = 0; j < 4; j++) {
setMV(bs, priv, j); // mv
}
#endif
}
else { // intra
if (h->vop_coding_type == VOP_P) {
int i;
#if 1
for (i = 0; i < 4; i++) {
priv->MV[0][i][vp->mb_ypos+1][vp->mb_xpos+1] = 0;
priv->MV[1][i][vp->mb_ypos+1][vp->mb_xpos+1] = 0;
}
#endif
}
}
#if 1
// motion compensation
if (interFlag)
{
// reconstruct(mp4_state->hdr.mb_xpos, mp4_state->hdr.mb_ypos, mp4_state->hdr.derived_mb_type);
// texture decoding add
for (j = 0; j < 6; j++) {
int coded = h->cbp & (1 << (5 - j));
if (coded) {
blockInter(bs, priv, j, (coded != 0));
//addblockInter(j, vp->mb_xpos, vp->mb_ypos);
}
}
}
else
{
// texture decoding add
for (j = 0; j < 6; j++) {
int coded = h->cbp & (1 << (5 - j));
blockIntra(bs, priv, j, (coded != 0));
//addblockIntra(j, vp->mb_xpos, vp->mb_ypos);
}
}
#endif
}
// not coded macroblock
else {
priv->MV[0][0][vp->mb_ypos+1][vp->mb_xpos+1] =
priv->MV[0][1][vp->mb_ypos+1][vp->mb_xpos+1] =
priv->MV[0][2][vp->mb_ypos+1][vp->mb_xpos+1] =
priv->MV[0][3][vp->mb_ypos+1][vp->mb_xpos+1] = 0;
priv->MV[1][0][vp->mb_ypos+1][vp->mb_xpos+1] =
priv->MV[1][1][vp->mb_ypos+1][vp->mb_xpos+1] =
priv->MV[1][2][vp->mb_ypos+1][vp->mb_xpos+1] =
priv->MV[1][3][vp->mb_ypos+1][vp->mb_xpos+1] = 0;
#if 0
//mp4_state->modemap[mp4_state->hdr.mb_ypos+1][mp4_state->hdr.mb_xpos+1] = NOT_CODED; // [Review] used only in P-VOPs
//reconstruct(mp4_state->hdr.mb_xpos, mp4_state->hdr.mb_ypos, mp4_state->hdr.derived_mb_type);
#endif
}
//mp4_state->quant_store[mp4_state->hdr.mb_ypos+1][mp4_state->hdr.mb_xpos+1] = mp4_state->hdr.quantizer;
if (priv->pkt_hdr.mb_xpos < (priv->pkt_hdr.mb_width-1)) {
priv->pkt_hdr.mb_xpos++;
}
else {
priv->pkt_hdr.mb_ypos++;
priv->pkt_hdr.mb_xpos = 0;
}
}
}
return 1;
}
static inline long ROUNDED_DIV(long a, long b)
{
return ((a)>0 ? (((a) + ((b)>>1))/(b)) : (((a) - ((b)>>1))/(b)));
}
static inline long long SIGNED_ROUNDED_DIV(long long a, long b)
{
return (((a) + (b>>1))/b);
}
#define LOG2CEIL(n) (n <= 1 ? 0 : 32 - __builtin_clz(n - 1))
int read_dmv_length(bitstream *gb)
{
int value = get_bits(gb, 2);
if(value == 2)
{
value = get_bits(gb, 1) + 3;
}
else if( value == 1)
{
value = get_bits(gb, 1) + 1;
}
else if( value == 3)
{
//int i = 3;
value = 5;
while (value < 14)
{
int value2 = get_bits(gb, 1);
if(value2 == 0)
break;
value++;
}
//if(i == 13)
// value = -1;
}
return value;
}
int read_dmv_code (bitstream *gb, int length)
{
int code=0;
code = get_bits(gb, length);
int first_bit = (1 << (length-1));
if((code & first_bit) == 0)
{
code = ((~(1 << length))+1) - ~code;
}
return code;
}
static int mpeg4_decode_sprite_trajectory(bitstream *gb, mp4_private_t *priv)
{
vop_header_t *vop = &priv->vop_header;
vol_header_t *vol = &priv->vol_header;
int i;
int a= 2<<vol->sprite_warping_accuracy;
int rho= 3-vol->sprite_warping_accuracy;
int r=16/a;
const int vop_ref[4][2]= { {0,0},
{vol->video_object_layer_width,0},
{0, vol->video_object_layer_height},
{vol->video_object_layer_width, vol->video_object_layer_height}}; // only true for rectangle shapes
int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
int sprite_ref[4][2];
int virtual_ref[2][2];
int w2, h2, w3, h3;
int alpha=0, beta=0;
int w= vol->video_object_layer_width;
int h= vol->video_object_layer_height;
int min_ab;
int temp, term1, term2,term3,term4;
if (w <= 0 || h <= 0)
return 1;
for(i=0; i<vol->no_of_sprite_warping_points; i++){
int length;
int x=0, y=0;
// length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
length = read_dmv_length(gb);
if(length){
// x= get_xbits(gb, length);
x = read_dmv_code(gb, length);
}
//if(!(s->divx_version==500 && s->divx_build==413)) skip_bits(gb,1); /* marker bit */
if (get_bits(gb, 1) != 1)
VDPAU_DBG("vop header marker error");
// length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
length= read_dmv_length(gb);
if(length){
// y=get_xbits(gb, length);
y=read_dmv_code(gb, length);
}
if (get_bits(gb, 1) != 1)
VDPAU_DBG("vop header marker error");
vop->sprite_traj[i][0]= d[i][0]= x;
vop->sprite_traj[i][1]= d[i][1]= y;
}
for(; i<4; i++)
vop->sprite_traj[i][0]= vop->sprite_traj[i][1]= 0;
while((1<<alpha)<w) alpha++;
while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
w2= 1<<alpha;
h2= 1<<beta;
vop->effective_sprite_warping_points = vol->no_of_sprite_warping_points;
while(vop->effective_sprite_warping_points &&
!(vop->sprite_traj[vop->effective_sprite_warping_points-1][0] || vop->sprite_traj[vop->effective_sprite_warping_points-1][1]))
vop->effective_sprite_warping_points--;
// Note, the 4th point isn't used for GMC
#if 0
if(s->divx_version==500 && s->divx_build==413){
sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
} else {
#endif
int temp_i0 = (2*vop_ref[0][0] + d[0][0]);
sprite_ref[0][0]= (a>>1)*temp_i0;
int temp_j0 = (2*vop_ref[0][1] + d[0][1]);
sprite_ref[0][1]= (a>>1)*temp_j0;
int temp_i1 = (2*vop_ref[1][0] + d[0][0] + d[1][0]);
sprite_ref[1][0]= (a>>1)*temp_i1;
int temp_j1 = (2*vop_ref[1][1] + d[0][1] + d[1][1]);
sprite_ref[1][1]= (a>>1)*temp_j1;
int temp_i2 = (2*vop_ref[2][0] + d[0][0] + d[2][0]);
sprite_ref[2][0]= (a>>1)*temp_i2;
int temp_j2 = (2*vop_ref[2][1] + d[0][1] + d[2][1]);
sprite_ref[2][1]= (a>>1)*temp_j2;
// }
vop->sprite_ref[0][0] = sprite_ref[0][0];
vop->sprite_ref[0][1] = sprite_ref[0][1];
vop->sprite_ref[1][0] = sprite_ref[1][0];
vop->sprite_ref[1][1] = sprite_ref[1][1];
vop->sprite_ref[2][0] = sprite_ref[2][0];
vop->sprite_ref[2][1] = sprite_ref[2][1];
/* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
// this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
// perhaps it should be reordered to be more readable ...
// the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
// so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
long temp_v1_1 = 16*(vop_ref[0][0] + w2);
long temp_v1_2_1 = (w - w2);
long temp_v1_2_2 = (r*sprite_ref[0][0] - 16*vop_ref[0][0]);
long temp_v1_2 = temp_v1_2_1 * temp_v1_2_2;
long temp_v1_3_2 = 16 * -vop_ref[1][0];
long temp_v1_3_1 = (r*sprite_ref[1][0] + temp_v1_3_2);
long temp_v1_3 = w2 * temp_v1_3_1;
long temp_v1_4 = ( temp_v1_2 + temp_v1_3);
long temp_v1_5 = ROUNDED_DIV(temp_v1_4,w);
virtual_ref[0][0]= temp_v1_1 + temp_v1_5;
long temp_v2_1 = 16*vop_ref[0][1];
long temp_v2_2_1 = (w - w2);
long temp_v2_2_2 = (r * sprite_ref[0][1] - 16*vop_ref[0][1]);
long temp_v2_2 = temp_v2_2_1 * temp_v2_2_2;
long temp_v2_3 = w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1]);
long temp_v2_4 = (temp_v2_2 + temp_v2_3);
long temp_v2_5 = ROUNDED_DIV(temp_v2_4,w);
virtual_ref[0][1]= temp_v2_1 + temp_v2_5;
long temp_v3_1 = 16*vop_ref[0][0];
long temp_v3_2_1 = (h - h2);
long temp_v3_2_2 = (r* sprite_ref[0][0] - 16*vop_ref[0][0]);
long temp_v3_2 = temp_v3_2_1 * temp_v3_2_2;
long temp_v3_3 = h2*(r* sprite_ref[2][0] - 16*vop_ref[2][0]);
long temp_v3_4 = ( temp_v3_2 + temp_v3_3);
long temp_v3_5 = ROUNDED_DIV(temp_v3_4,h);
virtual_ref[1][0]= temp_v3_1 + temp_v3_5;
long temp_v4_1 = 16*(vop_ref[0][1] + h2);
long temp_v4_2_1 = (h - h2);
long temp_v4_2_2 = (r * sprite_ref[0][1] - 16*vop_ref[0][1]);
long temp_v4_2 = temp_v4_2_1 * temp_v4_2_2;
long temp_v4_3 = h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1]);
long temp_v4_4 = ( temp_v4_2 + temp_v4_3);
long temp_v4_5 = ROUNDED_DIV(temp_v4_4,h);
virtual_ref[1][1]= temp_v4_1 + temp_v4_5;
//warping
long w2_h2_r = w2*h2*r;
long temp_v1_6 = (-r)*sprite_ref[0][0] + virtual_ref[0][0];
long temp_v1_7 = (-r)*sprite_ref[0][0] + virtual_ref[1][0];
long virtual_ref_0_0_adv_1 = h2 * temp_v1_6;
long virtual_ref_0_0_adv_2 = w2 * temp_v1_7;
long virtual_ref_0_0_adv = virtual_ref_0_0_adv_1 + virtual_ref_0_0_adv_2;
vop->virtual_ref[0][0] = SIGNED_ROUNDED_DIV(virtual_ref_0_0_adv,w2_h2_r) + sprite_ref[0][0];
long temp_v2_6 = (-r)*sprite_ref[0][1] + virtual_ref[0][1];
long temp_v2_7 = (-r)*sprite_ref[0][1] + virtual_ref[1][1];
long virtual_ref_0_1_adv_1 = h2 * temp_v2_6;
long virtual_ref_0_1_adv_2 = w2 * temp_v2_7;
long virtual_ref_0_1_adv = virtual_ref_0_1_adv_1 + virtual_ref_0_1_adv_2;
vop->virtual_ref[0][1] = SIGNED_ROUNDED_DIV(virtual_ref_0_1_adv,w2_h2_r) + sprite_ref[0][1];
long temp_v3_6 = (-r)*sprite_ref[0][0] + virtual_ref[0][0];
long temp_v3_7 = (-r)*sprite_ref[0][0] + virtual_ref[1][0];
long virtual_ref_1_0_adv_1 = w2 * temp_v3_6;
long virtual_ref_1_0_adv_2 = h2 * temp_v3_7;
long virtual_ref_1_0_adv_3 = 2*w2_h2_r*sprite_ref[0][0];
long virtual_ref_1_0_adv_4 = 16*w2*h2;
long virtual_ref_1_0_adv = virtual_ref_1_0_adv_1 + virtual_ref_1_0_adv_2 +
virtual_ref_1_0_adv_3 - virtual_ref_1_0_adv_4;
vop->virtual_ref[1][0] = SIGNED_ROUNDED_DIV(virtual_ref_1_0_adv,4*w2_h2_r);
long temp_v4_6 = (-r)*sprite_ref[0][1] + virtual_ref[0][1];
long temp_v4_7 = (-r)*sprite_ref[0][1] + virtual_ref[1][1];
long virtual_ref_1_1_adv_1 = w2 * temp_v4_6;
long virtual_ref_1_1_adv_2 = h2 * temp_v4_7;
long virtual_ref_1_1_adv_3 = 2*w2_h2_r*sprite_ref[0][1];
long virtual_ref_1_1_adv_4 = 16*w2*h2;
long virtual_ref_1_1_adv = virtual_ref_1_1_adv_1 + virtual_ref_1_1_adv_2 +
virtual_ref_1_1_adv_3 - virtual_ref_1_1_adv_4;
vop->virtual_ref[1][1] = SIGNED_ROUNDED_DIV(virtual_ref_1_1_adv,4*w2_h2_r);
int runs = LOG2CEIL(w2*h2*r);
unsigned int mask = 1 << runs;
long normalize_save = virtual_ref_0_0_adv_2 | virtual_ref_0_1_adv_1 | virtual_ref_0_0_adv_1 | virtual_ref_0_1_adv_2;
unsigned int normalize = normalize_save | mask;
long save_virtual_ref_0_0_adv_2 = virtual_ref_0_0_adv_2;
long save_virtual_ref_0_1_adv_1 = virtual_ref_0_1_adv_1;
long save_virtual_ref_0_0_adv_1 = virtual_ref_0_0_adv_1;
long save_virtual_ref_0_1_adv_2 = virtual_ref_0_1_adv_2;
while (/*(runs > 0) && */((normalize & 0x1) == 0 ))
{
virtual_ref_0_0_adv_2 >>= 1;
virtual_ref_0_1_adv_1 >>= 1;
virtual_ref_0_0_adv_1 >>= 1;
virtual_ref_0_1_adv_2 >>= 1;
mask >>= 1;
normalize = virtual_ref_0_0_adv_2 | virtual_ref_0_1_adv_1 |