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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 unsigned exp golomb code.

  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 (CONFIG_FTRAPV && log < 0) {

  72.             av_log(0, 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 svq3_get_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);

  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.         if (buf & 1)

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

  210.         else

  211.             buf = (buf >> 1);

  212. 

  213.         return buf;

  214.     }

  215. }

  216. 

  217. static inline int get_se_golomb_long(GetBitContext *gb)

  218. {

  219.     unsigned int buf = get_ue_golomb_long(gb);

  220. 

  221.     if (buf & 1)

  222.         buf = (buf + 1) >> 1;

  223.     else

  224.         buf = -(buf >> 1);

  225. 

  226.     return buf;

  227. }

  228. 

  229. static inline int svq3_get_se_golomb(GetBitContext *gb)

  230. {

  231.     unsigned int buf;

  232. 

  233.     OPEN_READER(re, gb);

  234.     UPDATE_CACHE(re, gb);

  235.     buf = GET_CACHE(re, gb);

  236. 

  237.     if (buf & 0xAA800000) {

  238.         buf >>= 32 - 8;

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

  240.         CLOSE_READER(re, gb);

  241. 

  242.         return ff_interleaved_se_golomb_vlc_code[buf];

  243.     } else {

  244.         int log;

  245.         LAST_SKIP_BITS(re, gb, 8);

  246.         UPDATE_CACHE(re, gb);

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

  248. 

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

  250.             return INVALID_VLC;

  251. 

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

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

  254. 

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

  256.         CLOSE_READER(re, gb);

  257. 

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

  259.     }

  260. }

  261. 

  262. static inline int dirac_get_se_golomb(GetBitContext *gb)

  263. {

  264.     uint32_t ret = svq3_get_ue_golomb(gb);

  265. 

  266.     if (ret) {

  267.         uint32_t buf;

  268.         OPEN_READER(re, gb);

  269.         UPDATE_CACHE(re, gb);

  270.         buf = SHOW_SBITS(re, gb, 1);

  271.         LAST_SKIP_BITS(re, gb, 1);

  272.         ret = (ret ^ buf) - buf;

  273.         CLOSE_READER(re, gb);

  274.     }

  275. 

  276.     return ret;

  277. }

  278. 

  279. /**

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

  281.  */

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

  283.                                 int esc_len)

  284. {

  285.     unsigned int buf;

  286.     int log;

  287. 

  288.     OPEN_READER(re, gb);

  289.     UPDATE_CACHE(re, gb);

  290.     buf = GET_CACHE(re, gb);

  291. 

  292.     log = av_log2(buf);

  293. 

  294.     if (log > 31 - limit) {

  295.         buf >>= log - k;

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

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

  298.         CLOSE_READER(re, gb);

  299. 

  300.         return buf;

  301.     } else {

  302.         LAST_SKIP_BITS(re, gb, limit);

  303.         UPDATE_CACHE(re, gb);

  304. 

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

  306. 

  307.         LAST_SKIP_BITS(re, gb, esc_len);

  308.         CLOSE_READER(re, gb);

  309. 

  310.         return buf + limit - 1;

  311.     }

  312. }

  313. 

  314. /**

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

  316.  */

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

  318.                                        int esc_len)

  319. {

  320.     unsigned int buf;

  321.     int log;

  322. 

  323.     OPEN_READER(re, gb);

  324.     UPDATE_CACHE(re, gb);

  325.     buf = GET_CACHE(re, gb);

  326. 

  327.     log = av_log2(buf);

  328. 

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

  330.         32 - log < limit) {

  331.         buf >>= log - k;

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

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

  334.         CLOSE_READER(re, gb);

  335. 

  336.         return buf;

  337.     } else {

  338.         int i;

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

  340.             if (gb->size_in_bits <= re_index)

  341.                 return -1;

  342.             LAST_SKIP_BITS(re, gb, 1);

  343.             UPDATE_CACHE(re, gb);

  344.         }

  345.         SKIP_BITS(re, gb, 1);

  346. 

  347.         if (i < limit - 1) {

  348.             if (k) {

  349.                 if (k > MIN_CACHE_BITS - 1) {

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

  351.                     LAST_SKIP_BITS(re, gb, 16);

  352.                     UPDATE_CACHE(re, gb);

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

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

  355.                 } else {

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

  357.                     LAST_SKIP_BITS(re, gb, k);

  358.                 }

  359.             } else {

  360.                 buf = 0;

  361.             }

  362. 

  363.             CLOSE_READER(re, gb);

  364.             return buf + (i << k);

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

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

  367.             LAST_SKIP_BITS(re, gb, esc_len);

  368.             CLOSE_READER(re, gb);

  369. 

  370.             return buf + 1;

  371.         } else

  372.             return -1;

  373.     }

  374. }

  375. 

  376. /**

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

  378.  */

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

  380.                                 int esc_len)

  381. {

  382.     int v = get_ur_golomb(gb, k, limit, esc_len);

  383. 

  384.     v++;

  385.     if (v & 1)

  386.         return v >> 1;

  387.     else

  388.         return -(v >> 1);

  389. 

  390. //    return (v>>1) ^ -(v&1);

  391. }

  392. 

  393. /**

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

  395.  */

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

  397.                                      int esc_len)

  398. {

  399.     int v = get_ur_golomb_jpegls(gb, k, limit, esc_len);

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

  401. }

  402. 

  403. /**

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

  405.  */

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

  407. {

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

  409. }

  410. 

  411. /**

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

  413.  */

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

  415. {

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

  417.     if (uvar & 1)

  418.         return ~(uvar >> 1);

  419.     else

  420.         return uvar >> 1;

  421. }

  422. 

  423. #ifdef TRACE

  424. 

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

  426.                          int line)

  427. {

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

  429.     int pos  = get_bits_count(s);

  430.     int i    = get_ue_golomb(s);

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

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

  433. 

  434.     print_bin(bits, len);

  435. 

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

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

  438. 

  439.     return i;

  440. }

  441. 

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

  443.                          int line)

  444. {

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

  446.     int pos  = get_bits_count(s);

  447.     int i    = get_se_golomb(s);

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

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

  450. 

  451.     print_bin(bits, len);

  452. 

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

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

  455. 

  456.     return i;

  457. }

  458. 

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

  460.                          int line)

  461. {

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

  463.     int pos  = get_bits_count(s);

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

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

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

  467. 

  468.     print_bin(bits, len);

  469. 

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

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

  472. 

  473.     return i;

  474. }

  475. 

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

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

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

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

  480. 

  481. #endif /* TRACE */

  482. 

  483. /**

  484.  * write unsigned exp golomb code.

  485.  */

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

  487. {

  488.     av_assert2(i >= 0);

  489. 

  490. #if 0

  491.     if (i = 0) {

  492.         put_bits(pb, 1, 1);

  493.         return;

  494.     }

  495. #endif

  496.     if (i < 256)

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

  498.     else {

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

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

  501.     }

  502. }

  503. 

  504. /**

  505.  * write truncated unsigned exp golomb code.

  506.  */

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

  508. {

  509.     av_assert2(range >= 1);

  510.     av_assert2(i <= range);

  511. 

  512.     if (range == 2)

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

  514.     else

  515.         set_ue_golomb(pb, i);

  516. }

  517. 

  518. /**

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

  520.  */

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

  522. {

  523. #if 0

  524.     if (i <= 0)

  525.         i = -2 * i;

  526.     else

  527.         i = 2 * i - 1;

  528. #elif 1

  529.     i = 2 * i - 1;

  530.     if (i < 0)

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

  532. #else

  533.     i  = 2 * i - 1;

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

  535. #endif

  536.     set_ue_golomb(pb, i);

  537. }

  538. 

  539. /**

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

  541.  */

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

  543.                                  int esc_len)

  544. {

  545.     int e;

  546. 

  547.     av_assert2(i >= 0);

  548. 

  549.     e = i >> k;

  550.     if (e < limit)

  551.         put_bits(pb, e + k + 1, (1 << k) + (i & ((1 << k) - 1)));

  552.     else

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

  554. }

  555. 

  556. /**

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

  558.  */

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

  560.                                         int limit, int esc_len)

  561. {

  562.     int e;

  563. 

  564.     av_assert2(i >= 0);

  565. 

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

  567.     if (e < limit) {

  568.         while (e > 31) {

  569.             put_bits(pb, 31, 0);

  570.             e -= 31;

  571.         }

  572.         put_bits(pb, e, 1);

  573.         if (k)

  574.             put_sbits(pb, k, i);

  575.     } else {

  576.         while (limit > 31) {

  577.             put_bits(pb, 31, 0);

  578.             limit -= 31;

  579.         }

  580.         put_bits(pb, limit, 1);

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

  582.     }

  583. }

  584. 

  585. /**

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

  587.  */

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

  589.                                  int esc_len)

  590. {

  591.     int v;

  592. 

  593.     v  = -2 * i - 1;

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

  595. 

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

  597. }

  598. 

  599. /**

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

  601.  */

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

  603.                                       int limit, int esc_len)

  604. {

  605.     int v;

  606. 

  607.     v  = -2 * i - 1;

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

  609. 

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

  611. }

  612. 

  613. #endif /* AVCODEC_GOLOMB_H */