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FFmpeg/libavcodec/golomb.h

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  1. /*

  2.  * exp golomb vlc stuff

  3.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

  4.  * Copyright (c) 2004 Alex Beregszaszi

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * @brief

  26.  *     exp golomb vlc stuff

  27.  * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi

  28.  */

  29. 

  30. #ifndef AVCODEC_GOLOMB_H

  31. #define AVCODEC_GOLOMB_H

  32. 

  33. #include <stdint.h>

  34. 

  35. #include "get_bits.h"

  36. #include "put_bits.h"

  37. 

  38. #define INVALID_VLC           0x80000000

  39. 

  40. extern const uint8_t ff_golomb_vlc_len[512];

  41. extern const uint8_t ff_ue_golomb_vlc_code[512];

  42. extern const  int8_t ff_se_golomb_vlc_code[512];

  43. extern const uint8_t ff_ue_golomb_len[256];

  44. 

  45. extern const uint8_t ff_interleaved_golomb_vlc_len[256];

  46. extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];

  47. extern const  int8_t ff_interleaved_se_golomb_vlc_code[256];

  48. extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256];

  49. 

  50. /**

  51.  * Read an unsigned Exp-Golomb code in the range 0 to 8190.

  52.  */

  53. static inline int get_ue_golomb(GetBitContext *gb)

  54. {

  55.     unsigned int buf;

  56. 

  57.     OPEN_READER(re, gb);

  58.     UPDATE_CACHE(re, gb);

  59.     buf = GET_CACHE(re, gb);

  60. 

  61.     if (buf >= (1 << 27)) {

  62.         buf >>= 32 - 9;

  63.         LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);

  64.         CLOSE_READER(re, gb);

  65. 

  66.         return ff_ue_golomb_vlc_code[buf];

  67.     } else {

  68.         int log = 2 * av_log2(buf) - 31;

  69.         LAST_SKIP_BITS(re, gb, 32 - log);

  70.         CLOSE_READER(re, gb);

  71.         if (log < 7) {

  72.             av_log(NULL, AV_LOG_ERROR, "Invalid UE golomb code\n");

  73.             return AVERROR_INVALIDDATA;

  74.         }

  75.         buf >>= log;

  76.         buf--;

  77. 

  78.         return buf;

  79.     }

  80. }

  81. 

  82. /**

  83.  * Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.

  84.  */

  85. static inline unsigned get_ue_golomb_long(GetBitContext *gb)

  86. {

  87.     unsigned buf, log;

  88. 

  89.     buf = show_bits_long(gb, 32);

  90.     log = 31 - av_log2(buf);

  91.     skip_bits_long(gb, log);

  92. 

  93.     return get_bits_long(gb, log + 1) - 1;

  94. }

  95. 

  96. /**

  97.  * read unsigned exp golomb code, constraint to a max of 31.

  98.  * the return value is undefined if the stored value exceeds 31.

  99.  */

  100. static inline int get_ue_golomb_31(GetBitContext *gb)

  101. {

  102.     unsigned int buf;

  103. 

  104.     OPEN_READER(re, gb);

  105.     UPDATE_CACHE(re, gb);

  106.     buf = GET_CACHE(re, gb);

  107. 

  108.     buf >>= 32 - 9;

  109.     LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);

  110.     CLOSE_READER(re, gb);

  111. 

  112.     return ff_ue_golomb_vlc_code[buf];

  113. }

  114. 

  115. static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb)

  116. {

  117.     uint32_t buf;

  118. 

  119.     OPEN_READER(re, gb);

  120.     UPDATE_CACHE(re, gb);

  121.     buf = GET_CACHE(re, gb);

  122. 

  123.     if (buf & 0xAA800000) {

  124.         buf >>= 32 - 8;

  125.         LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);

  126.         CLOSE_READER(re, gb);

  127. 

  128.         return ff_interleaved_ue_golomb_vlc_code[buf];

  129.     } else {

  130.         unsigned ret = 1;

  131. 

  132.         do {

  133.             buf >>= 32 - 8;

  134.             LAST_SKIP_BITS(re, gb,

  135.                            FFMIN(ff_interleaved_golomb_vlc_len[buf], 8));

  136. 

  137.             if (ff_interleaved_golomb_vlc_len[buf] != 9) {

  138.                 ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1;

  139.                 ret  |= ff_interleaved_dirac_golomb_vlc_code[buf];

  140.                 break;

  141.             }

  142.             ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf];

  143.             UPDATE_CACHE(re, gb);

  144.             buf = GET_CACHE(re, gb);

  145.         } while (ret<0x8000000U && BITS_AVAILABLE(re, gb));

  146. 

  147.         CLOSE_READER(re, gb);

  148.         return ret - 1;

  149.     }

  150. }

  151. 

  152. /**

  153.  * read unsigned truncated exp golomb code.

  154.  */

  155. static inline int get_te0_golomb(GetBitContext *gb, int range)

  156. {

  157.     av_assert2(range >= 1);

  158. 

  159.     if (range == 1)

  160.         return 0;

  161.     else if (range == 2)

  162.         return get_bits1(gb) ^ 1;

  163.     else

  164.         return get_ue_golomb(gb);

  165. }

  166. 

  167. /**

  168.  * read unsigned truncated exp golomb code.

  169.  */

  170. static inline int get_te_golomb(GetBitContext *gb, int range)

  171. {

  172.     av_assert2(range >= 1);

  173. 

  174.     if (range == 2)

  175.         return get_bits1(gb) ^ 1;

  176.     else

  177.         return get_ue_golomb(gb);

  178. }

  179. 

  180. /**

  181.  * read signed exp golomb code.

  182.  */

  183. static inline int get_se_golomb(GetBitContext *gb)

  184. {

  185.     unsigned int buf;

  186. 

  187.     OPEN_READER(re, gb);

  188.     UPDATE_CACHE(re, gb);

  189.     buf = GET_CACHE(re, gb);

  190. 

  191.     if (buf >= (1 << 27)) {

  192.         buf >>= 32 - 9;

  193.         LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]);

  194.         CLOSE_READER(re, gb);

  195. 

  196.         return ff_se_golomb_vlc_code[buf];

  197.     } else {

  198.         int log = av_log2(buf), sign;

  199.         LAST_SKIP_BITS(re, gb, 31 - log);

  200.         UPDATE_CACHE(re, gb);

  201.         buf = GET_CACHE(re, gb);

  202. 

  203.         buf >>= log;

  204. 

  205.         LAST_SKIP_BITS(re, gb, 32 - log);

  206.         CLOSE_READER(re, gb);

  207. 

  208.         sign = -(buf & 1);

  209.         buf  = ((buf >> 1) ^ sign) - sign;

  210. 

  211.         return buf;

  212.     }

  213. }

  214. 

  215. static inline int get_se_golomb_long(GetBitContext *gb)

  216. {

  217.     unsigned int buf = get_ue_golomb_long(gb);

  218.     int sign = (buf & 1) - 1;

  219.     return ((buf >> 1) ^ sign) + 1;

  220. }

  221. 

  222. static inline int get_interleaved_se_golomb(GetBitContext *gb)

  223. {

  224.     unsigned int buf;

  225. 

  226.     OPEN_READER(re, gb);

  227.     UPDATE_CACHE(re, gb);

  228.     buf = GET_CACHE(re, gb);

  229. 

  230.     if (buf & 0xAA800000) {

  231.         buf >>= 32 - 8;

  232.         LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]);

  233.         CLOSE_READER(re, gb);

  234. 

  235.         return ff_interleaved_se_golomb_vlc_code[buf];

  236.     } else {

  237.         int log;

  238.         LAST_SKIP_BITS(re, gb, 8);

  239.         UPDATE_CACHE(re, gb);

  240.         buf |= 1 | (GET_CACHE(re, gb) >> 8);

  241. 

  242.         if ((buf & 0xAAAAAAAA) == 0)

  243.             return INVALID_VLC;

  244. 

  245.         for (log = 31; (buf & 0x80000000) == 0; log--)

  246.             buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30);

  247. 

  248.         LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8);

  249.         CLOSE_READER(re, gb);

  250. 

  251.         return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1;

  252.     }

  253. }

  254. 

  255. static inline int dirac_get_se_golomb(GetBitContext *gb)

  256. {

  257.     uint32_t ret = get_interleaved_ue_golomb(gb);

  258. 

  259.     if (ret) {

  260.         int sign = -get_bits1(gb);

  261.         ret = (ret ^ sign) - sign;

  262.     }

  263. 

  264.     return ret;

  265. }

  266. 

  267. /**

  268.  * read unsigned golomb rice code (ffv1).

  269.  */

  270. static inline int get_ur_golomb(GetBitContext *gb, int k, int limit,

  271.                                 int esc_len)

  272. {

  273.     unsigned int buf;

  274.     int log;

  275. 

  276.     OPEN_READER(re, gb);

  277.     UPDATE_CACHE(re, gb);

  278.     buf = GET_CACHE(re, gb);

  279. 

  280.     log = av_log2(buf);

  281. 

  282.     if (log > 31 - limit) {

  283.         buf >>= log - k;

  284.         buf  += (30U - log) << k;

  285.         LAST_SKIP_BITS(re, gb, 32 + k - log);

  286.         CLOSE_READER(re, gb);

  287. 

  288.         return buf;

  289.     } else {

  290.         LAST_SKIP_BITS(re, gb, limit);

  291.         UPDATE_CACHE(re, gb);

  292. 

  293.         buf = SHOW_UBITS(re, gb, esc_len);

  294. 

  295.         LAST_SKIP_BITS(re, gb, esc_len);

  296.         CLOSE_READER(re, gb);

  297. 

  298.         return buf + limit - 1;

  299.     }

  300. }

  301. 

  302. /**

  303.  * read unsigned golomb rice code (jpegls).

  304.  */

  305. static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit,

  306.                                        int esc_len)

  307. {

  308.     unsigned int buf;

  309.     int log;

  310. 

  311.     OPEN_READER(re, gb);

  312.     UPDATE_CACHE(re, gb);

  313.     buf = GET_CACHE(re, gb);

  314. 

  315.     log = av_log2(buf);

  316. 

  317.     if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) &&

  318.         32 - log < limit) {

  319.         buf >>= log - k;

  320.         buf  += (30U - log) << k;

  321.         LAST_SKIP_BITS(re, gb, 32 + k - log);

  322.         CLOSE_READER(re, gb);

  323. 

  324.         return buf;

  325.     } else {

  326.         int i;

  327.         for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) {

  328.             if (gb->size_in_bits <= re_index) {

  329.                 CLOSE_READER(re, gb);

  330.                 return -1;

  331.             }

  332.             LAST_SKIP_BITS(re, gb, 1);

  333.             UPDATE_CACHE(re, gb);

  334.         }

  335.         SKIP_BITS(re, gb, 1);

  336. 

  337.         if (i < limit - 1) {

  338.             if (k) {

  339.                 if (k > MIN_CACHE_BITS - 1) {

  340.                     buf = SHOW_UBITS(re, gb, 16) << (k-16);

  341.                     LAST_SKIP_BITS(re, gb, 16);

  342.                     UPDATE_CACHE(re, gb);

  343.                     buf |= SHOW_UBITS(re, gb, k-16);

  344.                     LAST_SKIP_BITS(re, gb, k-16);

  345.                 } else {

  346.                     buf = SHOW_UBITS(re, gb, k);

  347.                     LAST_SKIP_BITS(re, gb, k);

  348.                 }

  349.             } else {

  350.                 buf = 0;

  351.             }

  352. 

  353.             buf += (i << k);

  354.         } else if (i == limit - 1) {

  355.             buf = SHOW_UBITS(re, gb, esc_len);

  356.             LAST_SKIP_BITS(re, gb, esc_len);

  357. 

  358.             buf ++;

  359.         } else {

  360.             buf = -1;

  361.         }

  362.         CLOSE_READER(re, gb);

  363.         return buf;

  364.     }

  365. }

  366. 

  367. /**

  368.  * read signed golomb rice code (ffv1).

  369.  */

  370. static inline int get_sr_golomb(GetBitContext *gb, int k, int limit,

  371.                                 int esc_len)

  372. {

  373.     unsigned v = get_ur_golomb(gb, k, limit, esc_len);

  374.     return (v >> 1) ^ -(v & 1);

  375. }

  376. 

  377. /**

  378.  * read signed golomb rice code (flac).

  379.  */

  380. static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit,

  381.                                      int esc_len)

  382. {

  383.     unsigned v = get_ur_golomb_jpegls(gb, k, limit, esc_len);

  384.     return (v >> 1) ^ -(v & 1);

  385. }

  386. 

  387. /**

  388.  * read unsigned golomb rice code (shorten).

  389.  */

  390. static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)

  391. {

  392.     return get_ur_golomb_jpegls(gb, k, INT_MAX, 0);

  393. }

  394. 

  395. /**

  396.  * read signed golomb rice code (shorten).

  397.  */

  398. static inline int get_sr_golomb_shorten(GetBitContext *gb, int k)

  399. {

  400.     int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0);

  401.     return (uvar >> 1) ^ -(uvar & 1);

  402. }

  403. 

  404. #ifdef TRACE

  405. 

  406. static inline int get_ue(GetBitContext *s, const char *file, const char *func,

  407.                          int line)

  408. {

  409.     int show = show_bits(s, 24);

  410.     int pos  = get_bits_count(s);

  411.     int i    = get_ue_golomb(s);

  412.     int len  = get_bits_count(s) - pos;

  413.     int bits = show >> (24 - len);

  414. 

  415.     av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue  @%5d in %s %s:%d\n",

  416.            bits, len, i, pos, file, func, line);

  417. 

  418.     return i;

  419. }

  420. 

  421. static inline int get_se(GetBitContext *s, const char *file, const char *func,

  422.                          int line)

  423. {

  424.     int show = show_bits(s, 24);

  425.     int pos  = get_bits_count(s);

  426.     int i    = get_se_golomb(s);

  427.     int len  = get_bits_count(s) - pos;

  428.     int bits = show >> (24 - len);

  429. 

  430.     av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se  @%5d in %s %s:%d\n",

  431.            bits, len, i, pos, file, func, line);

  432. 

  433.     return i;

  434. }

  435. 

  436. static inline int get_te(GetBitContext *s, int r, char *file, const char *func,

  437.                          int line)

  438. {

  439.     int show = show_bits(s, 24);

  440.     int pos  = get_bits_count(s);

  441.     int i    = get_te0_golomb(s, r);

  442.     int len  = get_bits_count(s) - pos;

  443.     int bits = show >> (24 - len);

  444. 

  445.     av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te  @%5d in %s %s:%d\n",

  446.            bits, len, i, pos, file, func, line);

  447. 

  448.     return i;

  449. }

  450. 

  451. #define get_ue_golomb(a) get_ue(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)

  452. #define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__)

  453. #define get_te_golomb(a, r)  get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)

  454. #define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__)

  455. 

  456. #endif /* TRACE */

  457. 

  458. /**

  459.  * write unsigned exp golomb code.

  460.  */

  461. static inline void set_ue_golomb(PutBitContext *pb, int i)

  462. {

  463.     av_assert2(i >= 0);

  464. 

  465.     if (i < 256)

  466.         put_bits(pb, ff_ue_golomb_len[i], i + 1);

  467.     else {

  468.         int e = av_log2(i + 1);

  469.         put_bits(pb, 2 * e + 1, i + 1);

  470.     }

  471. }

  472. 

  473. /**

  474.  * write truncated unsigned exp golomb code.

  475.  */

  476. static inline void set_te_golomb(PutBitContext *pb, int i, int range)

  477. {

  478.     av_assert2(range >= 1);

  479.     av_assert2(i <= range);

  480. 

  481.     if (range == 2)

  482.         put_bits(pb, 1, i ^ 1);

  483.     else

  484.         set_ue_golomb(pb, i);

  485. }

  486. 

  487. /**

  488.  * write signed exp golomb code. 16 bits at most.

  489.  */

  490. static inline void set_se_golomb(PutBitContext *pb, int i)

  491. {

  492. #if 0

  493.     if (i <= 0)

  494.         i = -2 * i;

  495.     else

  496.         i = 2 * i - 1;

  497. #elif 1

  498.     i = 2 * i - 1;

  499.     if (i < 0)

  500.         i ^= -1;    //FIXME check if gcc does the right thing

  501. #else

  502.     i  = 2 * i - 1;

  503.     i ^= (i >> 31);

  504. #endif

  505.     set_ue_golomb(pb, i);

  506. }

  507. 

  508. /**

  509.  * write unsigned golomb rice code (ffv1).

  510.  */

  511. static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit,

  512.                                  int esc_len)

  513. {

  514.     int e;

  515. 

  516.     av_assert2(i >= 0);

  517. 

  518.     e = i >> k;

  519.     if (e < limit)

  520.         put_bits(pb, e + k + 1, (1 << k) + av_mod_uintp2(i, k));

  521.     else

  522.         put_bits(pb, limit + esc_len, i - limit + 1);

  523. }

  524. 

  525. /**

  526.  * write unsigned golomb rice code (jpegls).

  527.  */

  528. static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k,

  529.                                         int limit, int esc_len)

  530. {

  531.     int e;

  532. 

  533.     av_assert2(i >= 0);

  534. 

  535.     e = (i >> k) + 1;

  536.     if (e < limit) {

  537.         while (e > 31) {

  538.             put_bits(pb, 31, 0);

  539.             e -= 31;

  540.         }

  541.         put_bits(pb, e, 1);

  542.         if (k)

  543.             put_sbits(pb, k, i);

  544.     } else {

  545.         while (limit > 31) {

  546.             put_bits(pb, 31, 0);

  547.             limit -= 31;

  548.         }

  549.         put_bits(pb, limit, 1);

  550.         put_bits(pb, esc_len, i - 1);

  551.     }

  552. }

  553. 

  554. /**

  555.  * write signed golomb rice code (ffv1).

  556.  */

  557. static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit,

  558.                                  int esc_len)

  559. {

  560.     int v;

  561. 

  562.     v  = -2 * i - 1;

  563.     v ^= (v >> 31);

  564. 

  565.     set_ur_golomb(pb, v, k, limit, esc_len);

  566. }

  567. 

  568. /**

  569.  * write signed golomb rice code (flac).

  570.  */

  571. static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k,

  572.                                       int limit, int esc_len)

  573. {

  574.     int v;

  575. 

  576.     v  = -2 * i - 1;

  577.     v ^= (v >> 31);

  578. 

  579.     set_ur_golomb_jpegls(pb, v, k, limit, esc_len);

  580. }

  581. 

  582. #endif /* AVCODEC_GOLOMB_H */