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提交 2a992f46 编写于 作者: D Diego Biurrun
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cosmetics: Move MPEG-4 decoding functions around to avoid forward declarations. 

Originally committed as revision 20979 to svn://svn.ffmpeg.org/ffmpeg/trunk
上级 1436f317
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Showing with 625 addition and 632 deletion
libavcodec/h263.c
浏览文件 @ 2a992f46
...@@ -56,13 +56,6 @@ ...@@ -56,13 +56,6 @@
#define H263_MBTYPE_B_VLC_BITS 6 #define H263_MBTYPE_B_VLC_BITS 6
#define CBPC_B_VLC_BITS 3 #define CBPC_B_VLC_BITS 3
static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
int n, int coded, int intra, int rvlc);
static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb);
static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding);
#if CONFIG_ENCODERS #if CONFIG_ENCODERS
static void mpeg4_encode_visual_object_header(MpegEncContext *s); static void mpeg4_encode_visual_object_header(MpegEncContext *s);
static void mpeg4_encode_vol_header(MpegEncContext *s, int vo_number, static void mpeg4_encode_vol_header(MpegEncContext *s, int vo_number,
...@@ -872,6 +865,85 @@ static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], ...@@ -872,6 +865,85 @@ static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64],
} }
} }
/**
* predicts the dc.
* encoding quantized level -> quantized diff
* decoding quantized diff -> quantized level
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr pointer to an integer where the prediction direction will be stored
*/
static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
{
int a, b, c, wrap, pred, scale, ret;
int16_t *dc_val;
/* find prediction */
if (n < 4) {
scale = s->y_dc_scale;
} else {
scale = s->c_dc_scale;
}
if(IS_3IV1)
scale= 8;
wrap= s->block_wrap[n];
dc_val = s->dc_val[0] + s->block_index[n];
/* B C
* A X
*/
a = dc_val[ - 1];
b = dc_val[ - 1 - wrap];
c = dc_val[ - wrap];
/* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
if(s->first_slice_line && n!=3){
if(n!=2) b=c= 1024;
if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
}
if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
if(n==0 || n==4 || n==5)
b=1024;
}
if (abs(a - b) < abs(b - c)) {
pred = c;
*dir_ptr = 1; /* top */
} else {
pred = a;
*dir_ptr = 0; /* left */
}
/* we assume pred is positive */
pred = FASTDIV((pred + (scale >> 1)), scale);
if(encoding){
ret = level - pred;
}else{
level += pred;
ret= level;
if(s->error_recognition>=3){
if(level<0){
av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
if(level*scale > 2048 + scale){
av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
}
}
level *=scale;
if(level&(~2047)){
if(level<0)
level=0;
else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
level=2047;
}
dc_val[0]= level;
return ret;
}
static const int dquant_code[5]= {1,0,9,2,3}; static const int dquant_code[5]= {1,0,9,2,3};
void mpeg4_encode_mb(MpegEncContext * s, void mpeg4_encode_mb(MpegEncContext * s,
...@@ -2474,85 +2546,6 @@ void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number) ...@@ -2474,85 +2546,6 @@ void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
#endif //CONFIG_ENCODERS #endif //CONFIG_ENCODERS
/**
* predicts the dc.
* encoding quantized level -> quantized diff
* decoding quantized diff -> quantized level
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr pointer to an integer where the prediction direction will be stored
*/
static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
{
int a, b, c, wrap, pred, scale, ret;
int16_t *dc_val;
/* find prediction */
if (n < 4) {
scale = s->y_dc_scale;
} else {
scale = s->c_dc_scale;
}
if(IS_3IV1)
scale= 8;
wrap= s->block_wrap[n];
dc_val = s->dc_val[0] + s->block_index[n];
/* B C
* A X
*/
a = dc_val[ - 1];
b = dc_val[ - 1 - wrap];
c = dc_val[ - wrap];
/* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
if(s->first_slice_line && n!=3){
if(n!=2) b=c= 1024;
if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
}
if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
if(n==0 || n==4 || n==5)
b=1024;
}
if (abs(a - b) < abs(b - c)) {
pred = c;
*dir_ptr = 1; /* top */
} else {
pred = a;
*dir_ptr = 0; /* left */
}
/* we assume pred is positive */
pred = FASTDIV((pred + (scale >> 1)), scale);
if(encoding){
ret = level - pred;
}else{
level += pred;
ret= level;
if(s->error_recognition>=3){
if(level<0){
av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
if(level*scale > 2048 + scale){
av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
}
}
level *=scale;
if(level&(~2047)){
if(level<0)
level=0;
else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
level=2047;
}
dc_val[0]= level;
return ret;
}
/** /**
* predicts the ac. * predicts the ac.
* @param n block index (0-3 are luma, 4-5 are chroma) * @param n block index (0-3 are luma, 4-5 are chroma)
...@@ -3126,47 +3119,237 @@ static inline int mpeg4_is_resync(MpegEncContext *s){ ...@@ -3126,47 +3119,237 @@ static inline int mpeg4_is_resync(MpegEncContext *s){
return 0; return 0;
} }
/** static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
* decodes the next video packet.
* @return <0 if something went wrong
*/
static int mpeg4_decode_video_packet_header(MpegEncContext *s)
{ {
int mb_num_bits= av_log2(s->mb_num - 1) + 1; int i;
int header_extension=0, mb_num, len; 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;
/* is there enough space left for a video packet + header */ for(i=0; i<s->num_sprite_warping_points; i++){
if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1; int length;
int x=0, y=0;
for(len=0; len<32; len++){ length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
if(get_bits1(&s->gb)) break; if(length){
} x= get_xbits(gb, length);
}
if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){ length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n"); if(length){
return -1; 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;
if(s->shape != RECT_SHAPE){ while((1<<alpha)<w) alpha++;
header_extension= get_bits1(&s->gb); while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
//FIXME more stuff here w2= 1<<alpha;
} h2= 1<<beta;
mb_num= get_bits(&s->gb, mb_num_bits); // Note, the 4th point isn't used for GMC
if(mb_num>=s->mb_num){ if(s->divx_version==500 && s->divx_build==413){
av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num); sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
return -1; 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];
if(s->pict_type == FF_B_TYPE){ sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++; sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded 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]); */
s->mb_x= mb_num % s->mb_width; // this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
s->mb_y= mb_num / s->mb_width; // 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);
if(s->shape != BIN_ONLY_SHAPE){ switch(s->num_sprite_warping_points)
int qscale= get_bits(&s->gb, s->quant_precision); {
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;
}
}
/**
* decodes the next video packet.
* @return <0 if something went wrong
*/
static int 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;
}
if(s->pict_type == FF_B_TYPE){
while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++;
if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
}
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) if(qscale)
s->chroma_qscale=s->qscale= qscale; s->chroma_qscale=s->qscale= qscale;
} }
...@@ -3398,6 +3581,53 @@ static inline int get_amv(MpegEncContext *s, int n){ ...@@ -3398,6 +3581,53 @@ static inline int get_amv(MpegEncContext *s, int n){
return sum; return sum;
} }
/**
* decodes 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->error_recognition>=2){
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);
}
/** /**
* decodes first partition. * decodes first partition.
* @return number of MBs decoded or <0 if an error occurred * @return number of MBs decoded or <0 if an error occurred
...@@ -3704,35 +3934,291 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s) ...@@ -3704,35 +3934,291 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
} }
/** /**
* decode partition C of one MB. * decodes a block.
* @return <0 if an error occurred * @return <0 if an error occurred
*/ */
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64]) static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
int n, int coded, int intra, int rvlc)
{ {
int cbp, mb_type; int level, i, last, run;
const int xy= s->mb_x + s->mb_y*s->mb_stride; int dc_pred_dir;
RLTable * rl;
mb_type= s->current_picture.mb_type[xy]; RL_VLC_ELEM * rl_vlc;
cbp = s->cbp_table[xy]; const uint8_t * scan_table;
int qmul, qadd;
s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
if(s->current_picture.qscale_table[xy] != s->qscale){ //Note intra & rvlc should be optimized away if this is inlined
ff_set_qscale(s, s->current_picture.qscale_table[xy] );
}
if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) { if(intra) {
int i; if(s->use_intra_dc_vlc){
for(i=0; i<4; i++){ /* DC coef */
s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0]; if(s->partitioned_frame){
s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1]; 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;
} }
s->mb_intra = IS_INTRA(mb_type); 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 (IS_SKIP(mb_type)) { if(rvlc){
/* skip mb */ rl = &rvlc_rl_intra;
for(i=0;i<6;i++) rl_vlc = rvlc_rl_intra.rl_vlc[0];
s->block_last_index[i] = -1; }else{
rl = &rl_intra;
rl_vlc = 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 = &rvlc_rl_inter;
else rl = &rl_inter;
scan_table = s->intra_scantable.permutated;
if(s->mpeg_quant){
qmul=1;
qadd=0;
if(rvlc){
rl_vlc = rvlc_rl_inter.rl_vlc[0];
}else{
rl_vlc = rl_inter.rl_vlc[0];
}
}else{
qmul = s->qscale << 1;
qadd = (s->qscale - 1) | 1;
if(rvlc){
rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
}else{
rl_vlc = 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); LAST_SKIP_CACHE(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); LAST_SKIP_CACHE(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); LAST_SKIP_CACHE(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;
}; LAST_SKIP_CACHE(re, &s->gb, 1);
SKIP_COUNTER(re, &s->gb, 1+12+1);
}
#if 0
if(s->error_recognition >= FF_ER_COMPLIANT){
const int abs_level= FFABS(level);
if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
const int run1= run - rl->max_run[last][abs_level] - 1;
if(abs_level <= rl->max_level[last][run]){
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
return -1;
}
if(s->error_recognition > FF_ER_COMPLIANT){
if(abs_level <= rl->max_level[last][run]*2){
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
return -1;
}
if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
return -1;
}
}
}
}
#endif
if (level>0) level= level * qmul + qadd;
else level= level * qmul - qadd;
if((unsigned)(level + 2048) > 4095){
if(s->error_recognition > FF_ER_COMPLIANT){
if(level > 2560 || level<-2560){
av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
return -1;
}
}
level= level<0 ? -2048 : 2047;
}
i+= run + 1;
if(last) i+=192;
} else {
/* second escape */
#if MIN_CACHE_BITS < 20
LAST_SKIP_BITS(re, &s->gb, 2);
UPDATE_CACHE(re, &s->gb);
#else
SKIP_BITS(re, &s->gb, 2);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
} else {
/* first escape */
#if MIN_CACHE_BITS < 19
LAST_SKIP_BITS(re, &s->gb, 1);
UPDATE_CACHE(re, &s->gb);
#else
SKIP_BITS(re, &s->gb, 1);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run;
level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
}
} else {
i+= run;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
if (i > 62){
i-= 192;
if(i&(~63)){
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
block[scan_table[i]] = level;
break;
}
block[scan_table[i]] = level;
}
CLOSE_READER(re, &s->gb);
}
not_coded:
if (intra) {
if(!s->use_intra_dc_vlc){
block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
i -= i>>31; //if(i == -1) i=0;
}
mpeg4_pred_ac(s, block, n, dc_pred_dir);
if (s->ac_pred) {
i = 63; /* XXX: not optimal */
}
}
s->block_last_index[n] = i;
return 0;
}
/**
* decode partition C of one MB.
* @return <0 if an error occurred
*/
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
{
int cbp, mb_type;
const int xy= s->mb_x + s->mb_y*s->mb_stride;
mb_type= s->current_picture.mb_type[xy];
cbp = s->cbp_table[xy];
s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
if(s->current_picture.qscale_table[xy] != s->qscale){
ff_set_qscale(s, s->current_picture.qscale_table[xy] );
}
if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
int i;
for(i=0; i<4; i++){
s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0];
s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1];
}
s->mb_intra = IS_INTRA(mb_type);
if (IS_SKIP(mb_type)) {
/* skip mb */
for(i=0;i<6;i++)
s->block_last_index[i] = -1;
s->mv_dir = MV_DIR_FORWARD; s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16; s->mv_type = MV_TYPE_16X16;
if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){ if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
...@@ -4682,309 +5168,6 @@ end: ...@@ -4682,309 +5168,6 @@ end:
return SLICE_OK; return SLICE_OK;
} }
/**
* decodes 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->error_recognition>=2){
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);
}
/**
* decodes a block.
* @return <0 if an error occurred
*/
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
int n, int coded, int intra, int rvlc)
{
int level, i, last, run;
int 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 = &rvlc_rl_intra;
rl_vlc = rvlc_rl_intra.rl_vlc[0];
}else{
rl = &rl_intra;
rl_vlc = 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 = &rvlc_rl_inter;
else rl = &rl_inter;
scan_table = s->intra_scantable.permutated;
if(s->mpeg_quant){
qmul=1;
qadd=0;
if(rvlc){
rl_vlc = rvlc_rl_inter.rl_vlc[0];
}else{
rl_vlc = rl_inter.rl_vlc[0];
}
}else{
qmul = s->qscale << 1;
qadd = (s->qscale - 1) | 1;
if(rvlc){
rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
}else{
rl_vlc = 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); LAST_SKIP_CACHE(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); LAST_SKIP_CACHE(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); LAST_SKIP_CACHE(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;
}; LAST_SKIP_CACHE(re, &s->gb, 1);
SKIP_COUNTER(re, &s->gb, 1+12+1);
}
#if 0
if(s->error_recognition >= FF_ER_COMPLIANT){
const int abs_level= FFABS(level);
if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
const int run1= run - rl->max_run[last][abs_level] - 1;
if(abs_level <= rl->max_level[last][run]){
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
return -1;
}
if(s->error_recognition > FF_ER_COMPLIANT){
if(abs_level <= rl->max_level[last][run]*2){
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
return -1;
}
if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
return -1;
}
}
}
}
#endif
if (level>0) level= level * qmul + qadd;
else level= level * qmul - qadd;
if((unsigned)(level + 2048) > 4095){
if(s->error_recognition > FF_ER_COMPLIANT){
if(level > 2560 || level<-2560){
av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
return -1;
}
}
level= level<0 ? -2048 : 2047;
}
i+= run + 1;
if(last) i+=192;
} else {
/* second escape */
#if MIN_CACHE_BITS < 20
LAST_SKIP_BITS(re, &s->gb, 2);
UPDATE_CACHE(re, &s->gb);
#else
SKIP_BITS(re, &s->gb, 2);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
} else {
/* first escape */
#if MIN_CACHE_BITS < 19
LAST_SKIP_BITS(re, &s->gb, 1);
UPDATE_CACHE(re, &s->gb);
#else
SKIP_BITS(re, &s->gb, 1);
#endif
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run;
level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
}
} else {
i+= run;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
if (i > 62){
i-= 192;
if(i&(~63)){
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
block[scan_table[i]] = level;
break;
}
block[scan_table[i]] = level;
}
CLOSE_READER(re, &s->gb);
}
not_coded:
if (intra) {
if(!s->use_intra_dc_vlc){
block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
i -= i>>31; //if(i == -1) i=0;
}
mpeg4_pred_ac(s, block, n, dc_pred_dir);
if (s->ac_pred) {
i = 63; /* XXX: not optimal */
}
}
s->block_last_index[n] = i;
return 0;
}
/* most is hardcoded. should extend to handle all h263 streams */ /* most is hardcoded. should extend to handle all h263 streams */
int h263_decode_picture_header(MpegEncContext *s) int h263_decode_picture_header(MpegEncContext *s)
{ {
...@@ -5254,196 +5437,6 @@ int h263_decode_picture_header(MpegEncContext *s) ...@@ -5254,196 +5437,6 @@ int h263_decode_picture_header(MpegEncContext *s)
return 0; return 0;
} }
static void 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;
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;
}
}
static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){ static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
int hours, minutes, seconds; int hours, minutes, seconds;
......
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