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mpeg4videodec.c
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/*
* MPEG4 decoder.
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2010 Michael Niedermayer <[email protected]>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define UNCHECKED_BITSTREAM_READER 1
#include "libavutil/opt.h"
#include "error_resilience.h"
#include "internal.h"
#include "mpegvideo.h"
#include "mpeg4video.h"
#include "h263.h"
#include "thread.h"
// The defines below define the number of bits that are read at once for
// reading vlc values. Changing these may improve speed and data cache needs
// be aware though that decreasing them may need the number of stages that is
// passed to get_vlc* to be increased.
#define SPRITE_TRAJ_VLC_BITS 6
#define DC_VLC_BITS 9
#define MB_TYPE_B_VLC_BITS 4
static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
static VLC mb_type_b_vlc;
static const int mb_type_b_map[4]= {
MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
MB_TYPE_L0L1 | MB_TYPE_16x16,
MB_TYPE_L1 | MB_TYPE_16x16,
MB_TYPE_L0 | MB_TYPE_16x16,
};
/**
* Predict the ac.
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir the ac prediction direction
*/
void ff_mpeg4_pred_ac(MpegEncContext * s, int16_t *block, int n,
int dir)
{
int i;
int16_t *ac_val, *ac_val1;
int8_t * const qscale_table = s->current_picture.qscale_table;
/* find prediction */
ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
ac_val1 = ac_val;
if (s->ac_pred) {
if (dir == 0) {
const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
/* left prediction */
ac_val -= 16;
if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
/* same qscale */
for(i=1;i<8;i++) {
block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
}
}else{
/* different qscale, we must rescale */
for(i=1;i<8;i++) {
block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
}
}
} else {
const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
/* top prediction */
ac_val -= 16 * s->block_wrap[n];
if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
/* same qscale */
for(i=1;i<8;i++) {
block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
}
}else{
/* different qscale, we must rescale */
for(i=1;i<8;i++) {
block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
}
}
}
}
/* left copy */
for(i=1;i<8;i++)
ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
/* top copy */
for(i=1;i<8;i++)
ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
}
/**
* check if the next stuff is a resync marker or the end.
* @return 0 if not
*/
static inline int mpeg4_is_resync(MpegEncContext *s){
int bits_count= get_bits_count(&s->gb);
int v= show_bits(&s->gb, 16);
if(s->workaround_bugs&FF_BUG_NO_PADDING && !s->resync_marker){
return 0;
}
while(v<=0xFF){
if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
break;
skip_bits(&s->gb, 8+s->pict_type);
bits_count+= 8+s->pict_type;
v= show_bits(&s->gb, 16);
}
if(bits_count + 8 >= s->gb.size_in_bits){
v>>=8;
v|= 0x7F >> (7-(bits_count&7));
if(v==0x7F)
return s->mb_num;
}else{
if(v == ff_mpeg4_resync_prefix[bits_count&7]){
int len, mb_num;
int mb_num_bits= av_log2(s->mb_num - 1) + 1;
GetBitContext gb= s->gb;
skip_bits(&s->gb, 1);
align_get_bits(&s->gb);
for(len=0; len<32; len++){
if(get_bits1(&s->gb)) break;
}
mb_num= get_bits(&s->gb, mb_num_bits);
if(!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
mb_num= -1;
s->gb= gb;
if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
return mb_num;
}
}
return 0;
}
static int mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
{
int i;
int a= 2<<s->sprite_warping_accuracy;
int rho= 3-s->sprite_warping_accuracy;
int r=16/a;
const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->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= s->width;
int h= s->height;
int min_ab;
if(w<=0 || h<=0)
return -1;
for(i=0; i<s->num_sprite_warping_points; i++){
int length;
int x=0, y=0;
length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
if(length){
x= get_xbits(gb, length);
}
if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
if(length){
y=get_xbits(gb, length);
}
skip_bits1(gb); /* marker bit */
s->sprite_traj[i][0]= d[i][0]= x;
s->sprite_traj[i][1]= d[i][1]= y;
}
for(; i<4; i++)
s->sprite_traj[i][0]= s->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;
// Note, the 4th point isn't used for GMC
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 {
sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[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
virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
+ ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
virtual_ref[0][1]= 16*vop_ref[0][1]
+ ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
virtual_ref[1][0]= 16*vop_ref[0][0]
+ ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
+ ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
switch(s->num_sprite_warping_points)
{
case 0:
s->sprite_offset[0][0]= 0;
s->sprite_offset[0][1]= 0;
s->sprite_offset[1][0]= 0;
s->sprite_offset[1][1]= 0;
s->sprite_delta[0][0]= a;
s->sprite_delta[0][1]= 0;
s->sprite_delta[1][0]= 0;
s->sprite_delta[1][1]= a;
s->sprite_shift[0]= 0;
s->sprite_shift[1]= 0;
break;
case 1: //GMC only
s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
s->sprite_delta[0][0]= a;
s->sprite_delta[0][1]= 0;
s->sprite_delta[1][0]= 0;
s->sprite_delta[1][1]= a;
s->sprite_shift[0]= 0;
s->sprite_shift[1]= 0;
break;
case 2:
s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
+ (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
+ ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
+ (1<<(alpha+rho-1));
s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
+ (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
+ (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
+ (1<<(alpha+rho-1));
s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
+( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
+2*w2*r*sprite_ref[0][0]
- 16*w2
+ (1<<(alpha+rho+1)));
s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
+(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
+2*w2*r*sprite_ref[0][1]
- 16*w2
+ (1<<(alpha+rho+1)));
s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
s->sprite_shift[0]= alpha+rho;
s->sprite_shift[1]= alpha+rho+2;
break;
case 3:
min_ab= FFMIN(alpha, beta);
w3= w2>>min_ab;
h3= h2>>min_ab;
s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
+ (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
+ (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
+ (1<<(alpha+beta+rho-min_ab-1));
s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
+ (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
+ (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
+ (1<<(alpha+beta+rho-min_ab-1));
s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
+ (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
+ 2*w2*h3*r*sprite_ref[0][0]
- 16*w2*h3
+ (1<<(alpha+beta+rho-min_ab+1));
s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
+ (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
+ 2*w2*h3*r*sprite_ref[0][1]
- 16*w2*h3
+ (1<<(alpha+beta+rho-min_ab+1));
s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
s->sprite_shift[0]= alpha + beta + rho - min_ab;
s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
break;
}
/* try to simplify the situation */
if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
&& s->sprite_delta[0][1] == 0
&& s->sprite_delta[1][0] == 0
&& s->sprite_delta[1][1] == a<<s->sprite_shift[0])
{
s->sprite_offset[0][0]>>=s->sprite_shift[0];
s->sprite_offset[0][1]>>=s->sprite_shift[0];
s->sprite_offset[1][0]>>=s->sprite_shift[1];
s->sprite_offset[1][1]>>=s->sprite_shift[1];
s->sprite_delta[0][0]= a;
s->sprite_delta[0][1]= 0;
s->sprite_delta[1][0]= 0;
s->sprite_delta[1][1]= a;
s->sprite_shift[0]= 0;
s->sprite_shift[1]= 0;
s->real_sprite_warping_points=1;
}
else{
int shift_y= 16 - s->sprite_shift[0];
int shift_c= 16 - s->sprite_shift[1];
for(i=0; i<2; i++){
s->sprite_offset[0][i]<<= shift_y;
s->sprite_offset[1][i]<<= shift_c;
s->sprite_delta[0][i]<<= shift_y;
s->sprite_delta[1][i]<<= shift_y;
s->sprite_shift[i]= 16;
}
s->real_sprite_warping_points= s->num_sprite_warping_points;
}
return 0;
}
/**
* Decode the next video packet.
* @return <0 if something went wrong
*/
int ff_mpeg4_decode_video_packet_header(MpegEncContext *s)
{
int mb_num_bits= av_log2(s->mb_num - 1) + 1;
int header_extension=0, mb_num, len;
/* is there enough space left for a video packet + header */
if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
for(len=0; len<32; len++){
if(get_bits1(&s->gb)) break;
}
if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
return -1;
}
if(s->shape != RECT_SHAPE){
header_extension= get_bits1(&s->gb);
//FIXME more stuff here
}
mb_num= get_bits(&s->gb, mb_num_bits);
if(mb_num>=s->mb_num){
av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
return -1;
}
s->mb_x= mb_num % s->mb_width;
s->mb_y= mb_num / s->mb_width;
if(s->shape != BIN_ONLY_SHAPE){
int qscale= get_bits(&s->gb, s->quant_precision);
if(qscale)
s->chroma_qscale=s->qscale= qscale;
}
if(s->shape == RECT_SHAPE){
header_extension= get_bits1(&s->gb);
}
if(header_extension){
int time_incr=0;
while (get_bits1(&s->gb) != 0)
time_incr++;
check_marker(&s->gb, "before time_increment in video packed header");
skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
check_marker(&s->gb, "before vop_coding_type in video packed header");
skip_bits(&s->gb, 2); /* vop coding type */
//FIXME not rect stuff here
if(s->shape != BIN_ONLY_SHAPE){
skip_bits(&s->gb, 3); /* intra dc vlc threshold */
//FIXME don't just ignore everything
if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
if(mpeg4_decode_sprite_trajectory(s, &s->gb) < 0)
return -1;
av_log(s->avctx, AV_LOG_ERROR, "untested\n");
}
//FIXME reduced res stuff here
if (s->pict_type != AV_PICTURE_TYPE_I) {
int f_code = get_bits(&s->gb, 3); /* fcode_for */
if(f_code==0){
av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
}
}
if (s->pict_type == AV_PICTURE_TYPE_B) {
int b_code = get_bits(&s->gb, 3);
if(b_code==0){
av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
}
}
}
}
//FIXME new-pred stuff
return 0;
}
/**
* Get the average motion vector for a GMC MB.
* @param n either 0 for the x component or 1 for y
* @return the average MV for a GMC MB
*/
static inline int get_amv(MpegEncContext *s, int n){
int x, y, mb_v, sum, dx, dy, shift;
int len = 1 << (s->f_code + 4);
const int a= s->sprite_warping_accuracy;
if(s->workaround_bugs & FF_BUG_AMV)
len >>= s->quarter_sample;
if(s->real_sprite_warping_points==1){
if(s->divx_version==500 && s->divx_build==413)
sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
else
sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
}else{
dx= s->sprite_delta[n][0];
dy= s->sprite_delta[n][1];
shift= s->sprite_shift[0];
if(n) dy -= 1<<(shift + a + 1);
else dx -= 1<<(shift + a + 1);
mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
sum=0;
for(y=0; y<16; y++){
int v;
v= mb_v + dy*y;
//XXX FIXME optimize
for(x=0; x<16; x++){
sum+= v>>shift;
v+= dx;
}
}
sum= RSHIFT(sum, a+8-s->quarter_sample);
}
if (sum < -len) sum= -len;
else if (sum >= len) sum= len-1;
return sum;
}
/**
* Decode the dc value.
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr the prediction direction will be stored here
* @return the quantized dc
*/
static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
{
int level, code;
if (n < 4)
code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
else
code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
if (code < 0 || code > 9 /* && s->nbit<9 */){
av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
return -1;
}
if (code == 0) {
level = 0;
} else {
if(IS_3IV1){
if(code==1)
level= 2*get_bits1(&s->gb)-1;
else{
if(get_bits1(&s->gb))
level = get_bits(&s->gb, code-1) + (1<<(code-1));
else
level = -get_bits(&s->gb, code-1) - (1<<(code-1));
}
}else{
level = get_xbits(&s->gb, code);
}
if (code > 8){
if(get_bits1(&s->gb)==0){ /* marker */
if(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_COMPLIANT)){
av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
return -1;
}
}
}
}
return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
}
/**
* Decode first partition.
* @return number of MBs decoded or <0 if an error occurred
*/
static int mpeg4_decode_partition_a(MpegEncContext *s){
int mb_num;
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
/* decode first partition */
mb_num=0;
s->first_slice_line=1;
for(; s->mb_y<s->mb_height; s->mb_y++){
ff_init_block_index(s);
for(; s->mb_x<s->mb_width; s->mb_x++){
const int xy= s->mb_x + s->mb_y*s->mb_stride;
int cbpc;
int dir=0;
mb_num++;
ff_update_block_index(s);
if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
s->first_slice_line=0;
if(s->pict_type==AV_PICTURE_TYPE_I){
int i;
do{
if(show_bits_long(&s->gb, 19)==DC_MARKER){
return mb_num-1;
}
cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
if (cbpc < 0){
av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
}while(cbpc == 8);
s->cbp_table[xy]= cbpc & 3;
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
s->mb_intra = 1;
if(cbpc & 4) {
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
}
s->current_picture.qscale_table[xy]= s->qscale;
s->mbintra_table[xy]= 1;
for(i=0; i<6; i++){
int dc_pred_dir;
int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
if(dc < 0){
av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
dir<<=1;
if(dc_pred_dir) dir|=1;
}
s->pred_dir_table[xy]= dir;
}else{ /* P/S_TYPE */
int mx, my, pred_x, pred_y, bits;
int16_t * const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
const int stride= s->b8_stride*2;
try_again:
bits= show_bits(&s->gb, 17);
if(bits==MOTION_MARKER){
return mb_num-1;
}
skip_bits1(&s->gb);
if(bits&0x10000){
/* skip mb */
if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
mx= get_amv(s, 0);
my= get_amv(s, 1);
}else{
s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
mx=my=0;
}
mot_val[0 ]= mot_val[2 ]=
mot_val[0+stride]= mot_val[2+stride]= mx;
mot_val[1 ]= mot_val[3 ]=
mot_val[1+stride]= mot_val[3+stride]= my;
if(s->mbintra_table[xy])
ff_clean_intra_table_entries(s);
continue;
}
cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
if (cbpc < 0){
av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
if(cbpc == 20)
goto try_again;
s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
s->mb_intra = ((cbpc & 4) != 0);
if(s->mb_intra){
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
s->mbintra_table[xy]= 1;
mot_val[0 ]= mot_val[2 ]=
mot_val[0+stride]= mot_val[2+stride]= 0;
mot_val[1 ]= mot_val[3 ]=
mot_val[1+stride]= mot_val[3+stride]= 0;
}else{
if(s->mbintra_table[xy])
ff_clean_intra_table_entries(s);
if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
s->mcsel= get_bits1(&s->gb);
else s->mcsel= 0;
if ((cbpc & 16) == 0) {
/* 16x16 motion prediction */
ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
if(!s->mcsel){
mx = ff_h263_decode_motion(s, pred_x, s->f_code);
if (mx >= 0xffff)
return -1;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return -1;
s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
} else {
mx = get_amv(s, 0);
my = get_amv(s, 1);
s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
}
mot_val[0 ]= mot_val[2 ] =
mot_val[0+stride]= mot_val[2+stride]= mx;
mot_val[1 ]= mot_val[3 ]=
mot_val[1+stride]= mot_val[3+stride]= my;
} else {
int i;
s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
for(i=0;i<4;i++) {
int16_t *mot_val= ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
mx = ff_h263_decode_motion(s, pred_x, s->f_code);
if (mx >= 0xffff)
return -1;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return -1;
mot_val[0] = mx;
mot_val[1] = my;
}
}
}
}
}
s->mb_x= 0;
}
return mb_num;
}
/**
* decode second partition.
* @return <0 if an error occurred
*/
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
int mb_num=0;
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
s->mb_x= s->resync_mb_x;
s->first_slice_line=1;
for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
ff_init_block_index(s);
for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
const int xy= s->mb_x + s->mb_y*s->mb_stride;
mb_num++;
ff_update_block_index(s);
if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
s->first_slice_line=0;
if(s->pict_type==AV_PICTURE_TYPE_I){
int ac_pred= get_bits1(&s->gb);
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
if(cbpy<0){
av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
s->cbp_table[xy]|= cbpy<<2;
s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
}else{ /* P || S_TYPE */
if (IS_INTRA(s->current_picture.mb_type[xy])) {
int dir=0,i;
int ac_pred = get_bits1(&s->gb);
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
if(cbpy<0){
av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
if(s->cbp_table[xy] & 8) {
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
}
s->current_picture.qscale_table[xy] = s->qscale;
for(i=0; i<6; i++){
int dc_pred_dir;
int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
if(dc < 0){
av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
dir<<=1;
if(dc_pred_dir) dir|=1;
}
s->cbp_table[xy]&= 3; //remove dquant
s->cbp_table[xy]|= cbpy<<2;
s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
s->pred_dir_table[xy]= dir;
} else if (IS_SKIP(s->current_picture.mb_type[xy])) {
s->current_picture.qscale_table[xy] = s->qscale;
s->cbp_table[xy]= 0;
}else{
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
if(cbpy<0){
av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
if(s->cbp_table[xy] & 8) {
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
}
s->current_picture.qscale_table[xy] = s->qscale;
s->cbp_table[xy]&= 3; //remove dquant
s->cbp_table[xy]|= (cbpy^0xf)<<2;
}
}
}
if(mb_num >= mb_count) return 0;
s->mb_x= 0;
}
return 0;
}
/**
* Decode the first and second partition.
* @return <0 if error (and sets error type in the error_status_table)
*/
int ff_mpeg4_decode_partitions(MpegEncContext *s)
{
int mb_num;
const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_ERROR|ER_MV_ERROR) : ER_MV_ERROR;
const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_END |ER_MV_END) : ER_MV_END;
mb_num= mpeg4_decode_partition_a(s);
if(mb_num<0){
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
return -1;
}
if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
return -1;
}
s->mb_num_left= mb_num;
if(s->pict_type==AV_PICTURE_TYPE_I){
while(show_bits(&s->gb, 9) == 1)
skip_bits(&s->gb, 9);
if(get_bits_long(&s->gb, 19)!=DC_MARKER){
av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
}else{
while(show_bits(&s->gb, 10) == 1)
skip_bits(&s->gb, 10);
if(get_bits(&s->gb, 17)!=MOTION_MARKER){
av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
}
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
if( mpeg4_decode_partition_b(s, mb_num) < 0){
if(s->pict_type==AV_PICTURE_TYPE_P)
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_DC_ERROR);
return -1;
}else{
if(s->pict_type==AV_PICTURE_TYPE_P)
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_DC_END);
}
return 0;
}
/**
* Decode a block.
* @return <0 if an error occurred
*/
static inline int mpeg4_decode_block(MpegEncContext * s, int16_t * block,
int n, int coded, int intra, int rvlc)
{
int level, i, last, run;
int av_uninit(dc_pred_dir);
RLTable * rl;
RL_VLC_ELEM * rl_vlc;
const uint8_t * scan_table;
int qmul, qadd;
//Note intra & rvlc should be optimized away if this is inlined
if(intra) {
if(s->use_intra_dc_vlc){
/* DC coef */
if(s->partitioned_frame){
level = s->dc_val[0][ s->block_index[n] ];
if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
}else{
level = mpeg4_decode_dc(s, n, &dc_pred_dir);
if (level < 0)
return -1;
}
block[0] = level;
i = 0;
}else{
i = -1;
ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
}
if (!coded)
goto not_coded;
if(rvlc){
rl = &ff_rvlc_rl_intra;
rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
}else{
rl = &ff_mpeg4_rl_intra;
rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
}
if (s->ac_pred) {
if (dc_pred_dir == 0)
scan_table = s->intra_v_scantable.permutated; /* left */
else
scan_table = s->intra_h_scantable.permutated; /* top */
} else {
scan_table = s->intra_scantable.permutated;
}
qmul=1;
qadd=0;
} else {
i = -1;
if (!coded) {
s->block_last_index[n] = i;
return 0;
}
if(rvlc) rl = &ff_rvlc_rl_inter;
else rl = &ff_h263_rl_inter;
scan_table = s->intra_scantable.permutated;
if(s->mpeg_quant){
qmul=1;
qadd=0;
if(rvlc){
rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
}else{
rl_vlc = ff_h263_rl_inter.rl_vlc[0];
}
}else{
qmul = s->qscale << 1;
qadd = (s->qscale - 1) | 1;
if(rvlc){
rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
}else{
rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
}
}
}
{
OPEN_READER(re, &s->gb);
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
if (level==0) {
/* escape */
if(rvlc){
if(SHOW_UBITS(re, &s->gb, 1)==0){
av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
return -1;
}; SKIP_CACHE(re, &s->gb, 1);
last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
run= SHOW_UBITS(re, &s->gb, 6);
SKIP_COUNTER(re, &s->gb, 1+1+6);
UPDATE_CACHE(re, &s->gb);
if(SHOW_UBITS(re, &s->gb, 1)==0){
av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
return -1;
}; SKIP_CACHE(re, &s->gb, 1);
level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
return -1;
}; SKIP_CACHE(re, &s->gb, 5);
level= level * qmul + qadd;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
SKIP_COUNTER(re, &s->gb, 1+11+5+1);
i+= run + 1;
if(last) i+=192;
}else{
int cache;
cache= GET_CACHE(re, &s->gb);
if(IS_3IV1)
cache ^= 0xC0000000;
if (cache&0x80000000) {
if (cache&0x40000000) {
/* third escape */
SKIP_CACHE(re, &s->gb, 2);
last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
run= SHOW_UBITS(re, &s->gb, 6);
SKIP_COUNTER(re, &s->gb, 2+1+6);
UPDATE_CACHE(re, &s->gb);
if(IS_3IV1){
level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
}else{
if(SHOW_UBITS(re, &s->gb, 1)==0){
av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
return -1;
}; SKIP_CACHE(re, &s->gb, 1);
level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
if(SHOW_UBITS(re, &s->gb, 1)==0){
av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
return -1;
}
SKIP_COUNTER(re, &s->gb, 1+12+1);
}
#if 0
if(s->error_recognition >= FF_ER_COMPLIANT){
const int abs_level= FFABS(level);