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#include <stdlib.h> |
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#include "../portab.h" |
#include "../portab.h" |
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#include "bitstream.h" |
#include "bitstream.h" |
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#include "zigzag.h" |
#include "zigzag.h" |
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#include "vlc_codes.h" |
#include "vlc_codes.h" |
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#include "mbcoding.h" |
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#include "../utils/mbfunctions.h" |
#include "../utils/mbfunctions.h" |
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#include <stdlib.h> /* malloc, free */ |
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#define ESCAPE 7167 |
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10 |
#define ABS(X) (((X)>0)?(X):-(X)) |
#define ABS(X) (((X)>0)?(X):-(X)) |
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#define CLIP(X,A) (X > A) ? (A) : (X) |
#define CLIP(X,A) (X > A) ? (A) : (X) |
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static VLC *DCT3D[2]; |
VLC intra_table[65536]; |
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VLC inter_table[65536]; |
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16 |
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VLC DCT3Dintra[4096]; |
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VLC DCT3Dinter[4096]; |
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VLC *intra_table, *inter_table; |
static int16_t clip_table[4096]; |
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static short clip_table[4096]; |
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21 |
void create_vlc_tables(void) |
void init_vlc_tables(void) |
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{ |
{ |
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24 |
int32_t k, l, i, intra, last; |
int32_t k, l, i, intra, last; |
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VLC **coeff_ptr; |
VLC **coeff_ptr; |
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VLC *vlc1, *vlc2; |
VLC *vlc1, *vlc2; |
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VLC *DCT3Dintra; |
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VLC *DCT3Dinter; |
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DCT3Dintra = (VLC *) malloc(sizeof(VLC) * 4096); |
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DCT3Dinter = (VLC *) malloc(sizeof(VLC) * 4096); |
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vlc1 = DCT3Dintra; |
vlc1 = DCT3Dintra; |
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vlc2 = DCT3Dinter; |
vlc2 = DCT3Dinter; |
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vlc[0] = intra_table = (VLC *) malloc(128 * 511 * sizeof(VLC)); |
vlc[0] = intra_table; |
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vlc[1] = inter_table = (VLC *) malloc(128 * 511 * sizeof(VLC)); |
vlc[1] = inter_table; |
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// initialize the clipping table |
// initialize the clipping table |
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for(i = -2048; i < 2048; i++) { |
for(i = -2048; i < 2048; i++) { |
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clip_table[i + 2048] = 255; |
clip_table[i + 2048] = 255; |
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} |
} |
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// generate intra/inter vlc lookup table |
// generate encoding vlc lookup tables |
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for(i = 0; i < 4; i++) { |
for(i = 0; i < 4; i++) { |
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intra = i % 2; |
intra = i % 2; |
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last = i >> 1; |
last = i / 2; |
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coeff_ptr = coeff_vlc[last + (intra << 1)]; |
coeff_ptr = coeff_vlc[last + 2 * intra]; |
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for(k = -255; k < 256; k++) { // level |
for(k = -255; k < 256; k++) { // level |
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char *max_level_ptr = max_level[last + (intra << 1)]; |
int8_t *max_level_ptr = max_level[last + 2 * intra]; |
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char *max_run_ptr = max_run[last + (intra << 1)]; |
int8_t *max_run_ptr = max_run[last + 2 * intra]; |
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for(l = 0; l < 64; l++) { // run |
for(l = 0; l < 64; l++) { // run |
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int32_t level = k; |
int32_t level = k; |
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uint32_t run = l; |
uint32_t run = l; |
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if(abs(level) <= max_level_ptr[run] && run <= max_run_ptr[abs(level)]) { |
if((abs(level) <= max_level_ptr[run]) && |
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(run <= max_run_ptr[abs(level)])) { // level < max_level and run < max_run |
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if(level > 0) { |
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vlc[intra]->code = (coeff_ptr[run][level - 1].code) << 1; |
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vlc[intra]->len = coeff_ptr[run][level - 1].len + 1; |
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} |
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else if(level < 0) { |
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vlc[intra]->code = ((coeff_ptr[run][-level - 1].code) << 1) + 1; |
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vlc[intra]->len = coeff_ptr[run][-level - 1].len + 1; |
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} |
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else { |
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vlc[intra]->code = 0; |
vlc[intra]->code = 0; |
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vlc[intra]->len = 0; |
vlc[intra]->len = 0; |
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goto loop_end; |
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} |
} |
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} else { |
else { |
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if(level > 0) |
if(level > 0) // correct level |
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level -= max_level_ptr[run]; |
level -= max_level_ptr[run]; |
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else |
else |
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level += max_level_ptr[run]; |
level += max_level_ptr[run]; |
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if(abs(level) <= max_level_ptr[run] && |
if((abs(level) <= max_level_ptr[run]) && |
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run <= max_run_ptr[abs(level)]) { |
(run <= max_run_ptr[abs(level)])) { |
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if(level > 0) { |
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vlc[intra]->code = (0x06 << (coeff_ptr[run][level - 1].len + 1)) | |
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(coeff_ptr[run][level - 1].code << 1); |
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vlc[intra]->len = (coeff_ptr[run][level - 1].len + 1) + 8; |
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} |
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else if(level < 0) { |
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vlc[intra]->code = (0x06 << (coeff_ptr[run][-level - 1].len + 1)) | |
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((coeff_ptr[run][-level - 1].code << 1) + 1); |
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vlc[intra]->len = (coeff_ptr[run][-level - 1].len + 1) + 8; |
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} |
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else { |
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vlc[intra]->code = 0x06; |
vlc[intra]->code = 0x06; |
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vlc[intra]->len = 8; |
vlc[intra]->len = 8; |
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goto loop_end; |
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} |
} |
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} else { |
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if(level > 0) |
if(level > 0) // still here? |
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level += max_level_ptr[run]; |
level += max_level_ptr[run]; // restore level |
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else |
else |
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level -= max_level_ptr[run]; |
level -= max_level_ptr[run]; |
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run -= max_run_ptr[abs(level)] + 1; |
run -= max_run_ptr[abs(level)] + 1; // and change run |
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if(abs(level) <= max_level_ptr[run] && |
if((abs(level) <= max_level_ptr[run]) && |
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run <= max_run_ptr[abs(level)]) { |
(run <= max_run_ptr[abs(level)])) { |
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if(level > 0) { |
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vlc[intra]->code = (0x0e << (coeff_ptr[run][level - 1].len + 1)) | |
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(coeff_ptr[run][level - 1].code << 1); |
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vlc[intra]->len = (coeff_ptr[run][level - 1].len + 1) + 9; |
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} |
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else if(level < 0) { |
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vlc[intra]->code = (0x0e << (coeff_ptr[run][-level - 1].len + 1)) | |
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((coeff_ptr[run][-level - 1].code << 1) + 1); |
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vlc[intra]->len = (coeff_ptr[run][-level - 1].len + 1) + 9; |
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} |
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else { |
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vlc[intra]->code = 0x0e; |
vlc[intra]->code = 0x0e; |
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vlc[intra]->len = 9; |
vlc[intra]->len = 9; |
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goto loop_end; |
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} |
} |
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} else { |
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if(level != 0) |
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run += max_run_ptr[abs(level)] + 1; |
run += max_run_ptr[abs(level)] + 1; |
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else |
} |
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run++; |
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vlc[intra]->code = (uint32_t) ((0x1e + last) << 20) | |
vlc[intra]->code = (uint32_t) ((l << 14) | (0x1e + last) << 20) | |
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(l << 14) | (1 << 13) | ((k & 0xfff) << 1) | 1; |
(1 << 13) | ((k & 0xfff) << 1) | 1; |
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vlc[intra]->len = 30; |
vlc[intra]->len = 30; |
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vlc[intra]++; |
102 |
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continue; |
103 |
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104 |
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loop_end: |
105 |
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if(level != 0) { |
106 |
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vlc[intra]->code = (vlc[intra]->code << (coeff_ptr[run][abs(level) - 1].len + 1)) | |
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(coeff_ptr[run][abs(level) - 1].code << 1); |
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vlc[intra]->len = (coeff_ptr[run][abs(level) - 1].len + 1) + vlc[intra]->len; |
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if(level < 0) |
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vlc[intra]->code += 1; |
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} |
} |
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} |
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} |
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vlc[intra]++; |
vlc[intra]++; |
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} |
} |
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} |
} |
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} |
} |
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intra_table += 64*255; // center vlc tables |
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inter_table += 64*255; // center vlc tables |
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for(i = 0; i < 4096; i++) { |
for(i = 0; i < 4096; i++) { |
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if(i >= 512) { |
if(i >= 512) { |
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*vlc1 = DCT3Dtab3[(i >> 5) - 16]; |
*vlc1 = DCT3Dtab3[(i >> 5) - 16]; |
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} |
} |
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void destroy_vlc_tables(void) { |
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if(intra_table != NULL && inter_table != NULL) { |
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intra_table -= 64*255; // uncenter vlc tables |
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inter_table -= 64*255; // uncenter vlc tables |
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free(intra_table); |
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free(inter_table); |
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} |
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if(DCT3D[0] != NULL && DCT3D[1] != NULL) { |
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free(DCT3D[0]); |
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free(DCT3D[1]); |
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} |
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} |
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static __inline void CodeVector(Bitstream *bs, |
static __inline void CodeVector(Bitstream *bs, |
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int16_t value, |
int16_t value, |
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int16_t f_code, |
int16_t f_code, |
207 |
VLC *vlc; |
VLC *vlc; |
208 |
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j = intra; |
j = intra; |
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last = 1 + intra; |
last = intra; |
211 |
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while((v = qcoeff[zigzag[j++]]) == 0); |
while((v = qcoeff[zigzag[j]]) == 0) j++; |
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do { |
do { |
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// count zeroes |
// count zeroes |
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vlc = table + (clip_table[2048+v] << 6) + j - last; |
vlc = table + 64*255 + (clip_table[2048+v] << 6) + j - last; |
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last = j + 1; |
last = ++j; |
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while(j < 64 && (v = qcoeff[zigzag[j++]]) == 0); |
while(j < 64 && (v = qcoeff[zigzag[j]]) == 0) j++; |
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// write code |
// write code |
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if(j != 64) { |
if(j != 64) { |
544 |
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545 |
} |
} |
546 |
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int get_coeff(Bitstream * bs, int *run, int *last, int intra, int short_video_header) |
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{ |
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uint32_t mode; |
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const VLC *tab; |
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int32_t level; |
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if(short_video_header) // inter-VLCs will be used for both intra and inter blocks |
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intra = 0; |
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tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; |
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if(tab->code == -1) |
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goto error; |
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BitstreamSkip(bs, tab->len); |
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if(tab->code != ESCAPE) { |
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if(!intra) |
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{ |
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*run = (tab->code >> 4) & 255; |
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level = tab->code & 15; |
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*last = (tab->code >> 12) & 1; |
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} |
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else |
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{ |
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*run = (tab->code >> 8) & 255; |
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level = tab->code & 255; |
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*last = (tab->code >> 16) & 1; |
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} |
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return BitstreamGetBit(bs) ? -level : level; |
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} |
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if(short_video_header) |
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{ |
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// escape mode 4 - H.263 type, only used if short_video_header = 1 |
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*last = BitstreamGetBit(bs); |
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*run = BitstreamGetBits(bs, 6); |
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level = BitstreamGetBits(bs, 8); |
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if (level == 0 || level == 128) |
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DEBUG1("Illegal LEVEL for ESCAPE mode 4:", level); |
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return (level >= 128 ? -(256 - level) : level); |
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} |
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mode = BitstreamShowBits(bs, 2); |
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if(mode < 3) { |
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BitstreamSkip(bs, (mode == 2) ? 2 : 1); |
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tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; |
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if (tab->code == -1) |
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goto error; |
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BitstreamSkip(bs, tab->len); |
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if (!intra) { |
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*run = (tab->code >> 4) & 255; |
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level = tab->code & 15; |
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*last = (tab->code >> 12) & 1; |
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} |
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else |
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{ |
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*run = (tab->code >> 8) & 255; |
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level = tab->code & 255; |
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*last = (tab->code >> 16) & 1; |
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} |
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if(mode < 2) // first escape mode, level is offset |
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level += max_level[*last + (!intra<<1)][*run]; // need to add back the max level |
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else if(mode == 2) // second escape mode, run is offset |
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*run += max_run[*last + (!intra<<1)][level] + 1; |
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return BitstreamGetBit(bs) ? -level : level; |
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} |
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// third escape mode - fixed length codes |
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BitstreamSkip(bs, 2); |
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*last = BitstreamGetBits(bs, 1); |
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*run = BitstreamGetBits(bs, 6); |
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BitstreamSkip(bs, 1); // marker |
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level = BitstreamGetBits(bs, 12); |
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BitstreamSkip(bs, 1); // marker |
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return (level & 0x800) ? (level | (-1 ^ 0xfff)) : level; |
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error: |
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*run = VLC_ERROR; |
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return 0; |
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} |
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void get_intra_block(Bitstream * bs, int16_t * block, int direction, int coeff) |
void get_intra_block(Bitstream * bs, int16_t * block, int direction, int coeff) |
548 |
{ |
{ |
549 |
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