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FFmpeg/libavcodec/mjpeg.c

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  1. /*

  2.  * MJPEG encoder and decoder

  3.  * Copyright (c) 2000, 2001 Fabrice Bellard.

  4.  *

  5.  * This library is free software; you can redistribute it and/or

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

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

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  18.  *

  19.  * Support for external huffman table, various fixes (AVID workaround),

  20.  * aspecting, new decode_frame mechanism and apple mjpeg-b support

  21.  *                                  by Alex Beregszaszi <alex@naxine.org>

  22.  */

  23. 

  24. /**

  25.  * @file mjpeg.c

  26.  * MJPEG encoder and decoder.

  27.  */

  28.  

  29. //#define DEBUG

  30. #include "avcodec.h"

  31. #include "dsputil.h"

  32. #include "mpegvideo.h"

  33. 

  34. /* use two quantizer tables (one for luminance and one for chrominance) */

  35. /* not yet working */

  36. #undef TWOMATRIXES

  37. 

  38. typedef struct MJpegContext {

  39.     uint8_t huff_size_dc_luminance[12];

  40.     uint16_t huff_code_dc_luminance[12];

  41.     uint8_t huff_size_dc_chrominance[12];

  42.     uint16_t huff_code_dc_chrominance[12];

  43. 

  44.     uint8_t huff_size_ac_luminance[256];

  45.     uint16_t huff_code_ac_luminance[256];

  46.     uint8_t huff_size_ac_chrominance[256];

  47.     uint16_t huff_code_ac_chrominance[256];

  48. } MJpegContext;

  49. 

  50. /* JPEG marker codes */

  51. typedef enum {

  52.     /* start of frame */

  53.     SOF0  = 0xc0,	/* baseline */

  54.     SOF1  = 0xc1,	/* extended sequential, huffman */

  55.     SOF2  = 0xc2,	/* progressive, huffman */

  56.     SOF3  = 0xc3,	/* lossless, huffman */

  57. 

  58.     SOF5  = 0xc5,	/* differential sequential, huffman */

  59.     SOF6  = 0xc6,	/* differential progressive, huffman */

  60.     SOF7  = 0xc7,	/* differential lossless, huffman */

  61.     JPG   = 0xc8,	/* reserved for JPEG extension */

  62.     SOF9  = 0xc9,	/* extended sequential, arithmetic */

  63.     SOF10 = 0xca,	/* progressive, arithmetic */

  64.     SOF11 = 0xcb,	/* lossless, arithmetic */

  65. 

  66.     SOF13 = 0xcd,	/* differential sequential, arithmetic */

  67.     SOF14 = 0xce,	/* differential progressive, arithmetic */

  68.     SOF15 = 0xcf,	/* differential lossless, arithmetic */

  69. 

  70.     DHT   = 0xc4,	/* define huffman tables */

  71. 

  72.     DAC   = 0xcc,	/* define arithmetic-coding conditioning */

  73. 

  74.     /* restart with modulo 8 count "m" */

  75.     RST0  = 0xd0,

  76.     RST1  = 0xd1,

  77.     RST2  = 0xd2,

  78.     RST3  = 0xd3,

  79.     RST4  = 0xd4,

  80.     RST5  = 0xd5,

  81.     RST6  = 0xd6,

  82.     RST7  = 0xd7,

  83. 

  84.     SOI   = 0xd8,	/* start of image */

  85.     EOI   = 0xd9,	/* end of image */

  86.     SOS   = 0xda,	/* start of scan */

  87.     DQT   = 0xdb,	/* define quantization tables */

  88.     DNL   = 0xdc,	/* define number of lines */

  89.     DRI   = 0xdd,	/* define restart interval */

  90.     DHP   = 0xde,	/* define hierarchical progression */

  91.     EXP   = 0xdf,	/* expand reference components */

  92. 

  93.     APP0  = 0xe0,

  94.     APP1  = 0xe1,

  95.     APP2  = 0xe2,

  96.     APP3  = 0xe3,

  97.     APP4  = 0xe4,

  98.     APP5  = 0xe5,

  99.     APP6  = 0xe6,

  100.     APP7  = 0xe7,

  101.     APP8  = 0xe8,

  102.     APP9  = 0xe9,

  103.     APP10 = 0xea,

  104.     APP11 = 0xeb,

  105.     APP12 = 0xec,

  106.     APP13 = 0xed,

  107.     APP14 = 0xee,

  108.     APP15 = 0xef,

  109. 

  110.     JPG0  = 0xf0,

  111.     JPG1  = 0xf1,

  112.     JPG2  = 0xf2,

  113.     JPG3  = 0xf3,

  114.     JPG4  = 0xf4,

  115.     JPG5  = 0xf5,

  116.     JPG6  = 0xf6,

  117.     JPG7  = 0xf7,

  118.     JPG8  = 0xf8,

  119.     JPG9  = 0xf9,

  120.     JPG10 = 0xfa,

  121.     JPG11 = 0xfb,

  122.     JPG12 = 0xfc,

  123.     JPG13 = 0xfd,

  124. 

  125.     COM   = 0xfe,	/* comment */

  126. 

  127.     TEM   = 0x01,	/* temporary private use for arithmetic coding */

  128. 

  129.     /* 0x02 -> 0xbf reserved */

  130. } JPEG_MARKER;

  131. 

  132. #if 0

  133. /* These are the sample quantization tables given in JPEG spec section K.1.

  134.  * The spec says that the values given produce "good" quality, and

  135.  * when divided by 2, "very good" quality.

  136.  */

  137. static const unsigned char std_luminance_quant_tbl[64] = {

  138.     16,  11,  10,  16,  24,  40,  51,  61,

  139.     12,  12,  14,  19,  26,  58,  60,  55,

  140.     14,  13,  16,  24,  40,  57,  69,  56,

  141.     14,  17,  22,  29,  51,  87,  80,  62,

  142.     18,  22,  37,  56,  68, 109, 103,  77,

  143.     24,  35,  55,  64,  81, 104, 113,  92,

  144.     49,  64,  78,  87, 103, 121, 120, 101,

  145.     72,  92,  95,  98, 112, 100, 103,  99

  146. };

  147. static const unsigned char std_chrominance_quant_tbl[64] = {

  148.     17,  18,  24,  47,  99,  99,  99,  99,

  149.     18,  21,  26,  66,  99,  99,  99,  99,

  150.     24,  26,  56,  99,  99,  99,  99,  99,

  151.     47,  66,  99,  99,  99,  99,  99,  99,

  152.     99,  99,  99,  99,  99,  99,  99,  99,

  153.     99,  99,  99,  99,  99,  99,  99,  99,

  154.     99,  99,  99,  99,  99,  99,  99,  99,

  155.     99,  99,  99,  99,  99,  99,  99,  99

  156. };

  157. #endif

  158. 

  159. /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */

  160. /* IMPORTANT: these are only valid for 8-bit data precision! */

  161. static const uint8_t bits_dc_luminance[17] =

  162. { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };

  163. static const uint8_t val_dc_luminance[] =

  164. { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  165. 

  166. static const uint8_t bits_dc_chrominance[17] =

  167. { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };

  168. static const uint8_t val_dc_chrominance[] =

  169. { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  170. 

  171. static const uint8_t bits_ac_luminance[17] =

  172. { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };

  173. static const uint8_t val_ac_luminance[] =

  174. { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,

  175.   0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,

  176.   0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,

  177.   0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,

  178.   0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,

  179.   0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,

  180.   0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,

  181.   0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,

  182.   0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,

  183.   0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  184.   0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  185.   0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,

  186.   0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,

  187.   0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,

  188.   0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,

  189.   0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,

  190.   0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,

  191.   0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,

  192.   0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,

  193.   0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

  194.   0xf9, 0xfa 

  195. };

  196. 

  197. static const uint8_t bits_ac_chrominance[17] =

  198. { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };

  199. 

  200. static const uint8_t val_ac_chrominance[] =

  201. { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,

  202.   0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,

  203.   0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,

  204.   0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,

  205.   0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,

  206.   0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,

  207.   0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,

  208.   0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,

  209.   0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,

  210.   0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,

  211.   0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,

  212.   0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,

  213.   0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,

  214.   0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,

  215.   0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,

  216.   0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,

  217.   0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,

  218.   0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,

  219.   0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,

  220.   0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

  221.   0xf9, 0xfa 

  222. };

  223. 

  224. /* isn't this function nicer than the one in the libjpeg ? */

  225. static void build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,

  226.                                 const uint8_t *bits_table, const uint8_t *val_table)

  227. {

  228.     int i, j, k,nb, code, sym;

  229. 

  230.     code = 0;

  231.     k = 0;

  232.     for(i=1;i<=16;i++) {

  233.         nb = bits_table[i];

  234.         for(j=0;j<nb;j++) {

  235.             sym = val_table[k++];

  236.             huff_size[sym] = i;

  237.             huff_code[sym] = code;

  238.             code++;

  239.         }

  240.         code <<= 1;

  241.     }

  242. }

  243. 

  244. int mjpeg_init(MpegEncContext *s)

  245. {

  246.     MJpegContext *m;

  247.     

  248.     m = av_malloc(sizeof(MJpegContext));

  249.     if (!m)

  250.         return -1;

  251.     

  252.     s->min_qcoeff=-1023;

  253.     s->max_qcoeff= 1023;

  254. 

  255.     /* build all the huffman tables */

  256.     build_huffman_codes(m->huff_size_dc_luminance,

  257.                         m->huff_code_dc_luminance,

  258.                         bits_dc_luminance,

  259.                         val_dc_luminance);

  260.     build_huffman_codes(m->huff_size_dc_chrominance,

  261.                         m->huff_code_dc_chrominance,

  262.                         bits_dc_chrominance,

  263.                         val_dc_chrominance);

  264.     build_huffman_codes(m->huff_size_ac_luminance,

  265.                         m->huff_code_ac_luminance,

  266.                         bits_ac_luminance,

  267.                         val_ac_luminance);

  268.     build_huffman_codes(m->huff_size_ac_chrominance,

  269.                         m->huff_code_ac_chrominance,

  270.                         bits_ac_chrominance,

  271.                         val_ac_chrominance);

  272.     

  273.     s->mjpeg_ctx = m;

  274.     return 0;

  275. }

  276. 

  277. void mjpeg_close(MpegEncContext *s)

  278. {

  279.     av_free(s->mjpeg_ctx);

  280. }

  281. 

  282. static inline void put_marker(PutBitContext *p, int code)

  283. {

  284.     put_bits(p, 8, 0xff);

  285.     put_bits(p, 8, code);

  286. }

  287. 

  288. /* table_class: 0 = DC coef, 1 = AC coefs */

  289. static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,

  290.                              const uint8_t *bits_table, const uint8_t *value_table)

  291. {

  292.     PutBitContext *p = &s->pb;

  293.     int n, i;

  294. 

  295.     put_bits(p, 4, table_class);

  296.     put_bits(p, 4, table_id);

  297. 

  298.     n = 0;

  299.     for(i=1;i<=16;i++) {

  300.         n += bits_table[i];

  301.         put_bits(p, 8, bits_table[i]);

  302.     }

  303. 

  304.     for(i=0;i<n;i++)

  305.         put_bits(p, 8, value_table[i]);

  306. 

  307.     return n + 17;

  308. }

  309. 

  310. static void jpeg_table_header(MpegEncContext *s)

  311. {

  312.     PutBitContext *p = &s->pb;

  313.     int i, j, size;

  314.     uint8_t *ptr;

  315. 

  316.     /* quant matrixes */

  317.     put_marker(p, DQT);

  318. #ifdef TWOMATRIXES

  319.     put_bits(p, 16, 2 + 2 * (1 + 64));

  320. #else

  321.     put_bits(p, 16, 2 + 1 * (1 + 64));

  322. #endif

  323.     put_bits(p, 4, 0); /* 8 bit precision */

  324.     put_bits(p, 4, 0); /* table 0 */

  325.     for(i=0;i<64;i++) {

  326.         j = s->intra_scantable.permutated[i];

  327.         put_bits(p, 8, s->intra_matrix[j]);

  328.     }

  329. #ifdef TWOMATRIXES

  330.     put_bits(p, 4, 0); /* 8 bit precision */

  331.     put_bits(p, 4, 1); /* table 1 */

  332.     for(i=0;i<64;i++) {

  333.         j = s->intra_scantable.permutated[i];

  334.         put_bits(p, 8, s->chroma_intra_matrix[j]);

  335.     }

  336. #endif

  337. 

  338.     /* huffman table */

  339.     put_marker(p, DHT);

  340.     flush_put_bits(p);

  341.     ptr = pbBufPtr(p);

  342.     put_bits(p, 16, 0); /* patched later */

  343.     size = 2;

  344.     size += put_huffman_table(s, 0, 0, bits_dc_luminance, val_dc_luminance);

  345.     size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance);

  346.     

  347.     size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance);

  348.     size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance);

  349.     ptr[0] = size >> 8;

  350.     ptr[1] = size;

  351. }

  352. 

  353. static void jpeg_put_comments(MpegEncContext *s)

  354. {

  355.     PutBitContext *p = &s->pb;

  356.     int size;

  357.     uint8_t *ptr;

  358. 

  359.     if (s->aspect_ratio_info)

  360.     {

  361.     /* JFIF header */

  362.     put_marker(p, APP0);

  363.     put_bits(p, 16, 16);

  364.     put_string(p, "JFIF"); /* this puts the trailing zero-byte too */

  365.     put_bits(p, 16, 0x0201); /* v 1.02 */

  366.     put_bits(p, 8, 0); /* units type: 0 - aspect ratio */

  367.     switch(s->aspect_ratio_info)

  368.     {

  369. 	case FF_ASPECT_4_3_625:

  370. 	case FF_ASPECT_4_3_525:

  371. 	    put_bits(p, 16, 4); 

  372. 	    put_bits(p, 16, 3);

  373. 	    break;

  374. 	case FF_ASPECT_16_9_625:

  375. 	case FF_ASPECT_16_9_525:

  376. 	    put_bits(p, 16, 16); 

  377. 	    put_bits(p, 16, 9);

  378. 	    break;

  379. 	case FF_ASPECT_EXTENDED:

  380. 	    put_bits(p, 16, s->aspected_width);

  381. 	    put_bits(p, 16, s->aspected_height);

  382. 	    break;

  383. 	case FF_ASPECT_SQUARE:

  384. 	default:

  385. 	    put_bits(p, 16, 1); /* aspect: 1:1 */

  386. 	    put_bits(p, 16, 1);

  387. 	    break;

  388.     }

  389.     put_bits(p, 8, 0); /* thumbnail width */

  390.     put_bits(p, 8, 0); /* thumbnail height */

  391.     }

  392. 

  393.     /* comment */

  394.     if(!(s->flags & CODEC_FLAG_BITEXACT)){

  395.         put_marker(p, COM);

  396.         flush_put_bits(p);

  397.         ptr = pbBufPtr(p);

  398.         put_bits(p, 16, 0); /* patched later */

  399.         put_string(p, LIBAVCODEC_IDENT);

  400.         size = strlen(LIBAVCODEC_IDENT)+3;

  401.         ptr[0] = size >> 8;

  402.         ptr[1] = size;

  403.     }

  404. }

  405. 

  406. void mjpeg_picture_header(MpegEncContext *s)

  407. {

  408.     put_marker(&s->pb, SOI);

  409. 

  410.     if (!s->mjpeg_data_only_frames)

  411.     {

  412.     jpeg_put_comments(s);    

  413. 

  414.     if (s->mjpeg_write_tables) jpeg_table_header(s);

  415. 

  416.     put_marker(&s->pb, SOF0);

  417. 

  418.     put_bits(&s->pb, 16, 17);

  419.     put_bits(&s->pb, 8, 8); /* 8 bits/component */

  420.     put_bits(&s->pb, 16, s->height);

  421.     put_bits(&s->pb, 16, s->width);

  422.     put_bits(&s->pb, 8, 3); /* 3 components */

  423.     

  424.     /* Y component */

  425.     put_bits(&s->pb, 8, 1); /* component number */

  426.     put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */

  427.     put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */

  428.     put_bits(&s->pb, 8, 0); /* select matrix */

  429.     

  430.     /* Cb component */

  431.     put_bits(&s->pb, 8, 2); /* component number */

  432.     put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */

  433.     put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */

  434. #ifdef TWOMATRIXES

  435.     put_bits(&s->pb, 8, 1); /* select matrix */

  436. #else

  437.     put_bits(&s->pb, 8, 0); /* select matrix */

  438. #endif

  439. 

  440.     /* Cr component */

  441.     put_bits(&s->pb, 8, 3); /* component number */

  442.     put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */

  443.     put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */

  444. #ifdef TWOMATRIXES

  445.     put_bits(&s->pb, 8, 1); /* select matrix */

  446. #else

  447.     put_bits(&s->pb, 8, 0); /* select matrix */

  448. #endif

  449.     }

  450. 

  451.     /* scan header */

  452.     put_marker(&s->pb, SOS);

  453.     put_bits(&s->pb, 16, 12); /* length */

  454.     put_bits(&s->pb, 8, 3); /* 3 components */

  455.     

  456.     /* Y component */

  457.     put_bits(&s->pb, 8, 1); /* index */

  458.     put_bits(&s->pb, 4, 0); /* DC huffman table index */

  459.     put_bits(&s->pb, 4, 0); /* AC huffman table index */

  460.     

  461.     /* Cb component */

  462.     put_bits(&s->pb, 8, 2); /* index */

  463.     put_bits(&s->pb, 4, 1); /* DC huffman table index */

  464.     put_bits(&s->pb, 4, 1); /* AC huffman table index */

  465.     

  466.     /* Cr component */

  467.     put_bits(&s->pb, 8, 3); /* index */

  468.     put_bits(&s->pb, 4, 1); /* DC huffman table index */

  469.     put_bits(&s->pb, 4, 1); /* AC huffman table index */

  470. 

  471.     put_bits(&s->pb, 8, 0); /* Ss (not used) */

  472.     put_bits(&s->pb, 8, 63); /* Se (not used) */

  473.     put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */

  474. }

  475. 

  476. static void escape_FF(MpegEncContext *s, int start)

  477. {

  478.     int size= get_bit_count(&s->pb) - start*8;

  479.     int i, ff_count;

  480.     uint8_t *buf= s->pb.buf + start;

  481.     int align= (-(int)(buf))&3;

  482.     

  483.     assert((size&7) == 0);

  484.     size >>= 3;

  485.     

  486.     ff_count=0;

  487.     for(i=0; i<size && i<align; i++){

  488.         if(buf[i]==0xFF) ff_count++;

  489.     }

  490.     for(; i<size-15; i+=16){

  491.         int acc, v;

  492. 

  493.         v= *(uint32_t*)(&buf[i]);

  494.         acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;

  495.         v= *(uint32_t*)(&buf[i+4]);

  496.         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;

  497.         v= *(uint32_t*)(&buf[i+8]);

  498.         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;

  499.         v= *(uint32_t*)(&buf[i+12]);

  500.         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;

  501. 

  502.         acc>>=4;

  503.         acc+= (acc>>16);

  504.         acc+= (acc>>8);

  505.         ff_count+= acc&0xFF;

  506.     }

  507.     for(; i<size; i++){

  508.         if(buf[i]==0xFF) ff_count++;

  509.     }

  510. 

  511.     if(ff_count==0) return;

  512.     

  513.     /* skip put bits */

  514.     for(i=0; i<ff_count-3; i+=4)

  515.         put_bits(&s->pb, 32, 0);

  516.     put_bits(&s->pb, (ff_count-i)*8, 0);

  517.     flush_put_bits(&s->pb); 

  518. 

  519.     for(i=size-1; ff_count; i--){

  520.         int v= buf[i];

  521. 

  522.         if(v==0xFF){

  523. //printf("%d %d\n", i, ff_count);

  524.             buf[i+ff_count]= 0;

  525.             ff_count--;

  526.         }

  527. 

  528.         buf[i+ff_count]= v;

  529.     }

  530. }

  531. 

  532. void mjpeg_picture_trailer(MpegEncContext *s)

  533. {

  534.     int pad= (-get_bit_count(&s->pb))&7;

  535.     

  536.     put_bits(&s->pb, pad,0xFF>>(8-pad));

  537.     flush_put_bits(&s->pb);

  538. 

  539.     assert((s->header_bits&7)==0);

  540.     

  541.     escape_FF(s, s->header_bits>>3);

  542. 

  543.     put_marker(&s->pb, EOI);

  544. }

  545. 

  546. static inline void mjpeg_encode_dc(MpegEncContext *s, int val,

  547. 				   uint8_t *huff_size, uint16_t *huff_code)

  548. {

  549.     int mant, nbits;

  550. 

  551.     if (val == 0) {

  552.         put_bits(&s->pb, huff_size[0], huff_code[0]);

  553.     } else {

  554.         mant = val;

  555.         if (val < 0) {

  556.             val = -val;

  557.             mant--;

  558.         }

  559.         

  560.         /* compute the log (XXX: optimize) */

  561.         nbits = 0;

  562.         while (val != 0) {

  563.             val = val >> 1;

  564.             nbits++;

  565.         }

  566.             

  567.         put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);

  568.         

  569.         put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));

  570.     }

  571. }

  572. 

  573. static void encode_block(MpegEncContext *s, DCTELEM *block, int n)

  574. {

  575.     int mant, nbits, code, i, j;

  576.     int component, dc, run, last_index, val;

  577.     MJpegContext *m = s->mjpeg_ctx;

  578.     uint8_t *huff_size_ac;

  579.     uint16_t *huff_code_ac;

  580.     

  581.     /* DC coef */

  582.     component = (n <= 3 ? 0 : n - 4 + 1);

  583.     dc = block[0]; /* overflow is impossible */

  584.     val = dc - s->last_dc[component];

  585.     if (n < 4) {

  586.         mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);

  587.         huff_size_ac = m->huff_size_ac_luminance;

  588.         huff_code_ac = m->huff_code_ac_luminance;

  589.     } else {

  590.         mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);

  591.         huff_size_ac = m->huff_size_ac_chrominance;

  592.         huff_code_ac = m->huff_code_ac_chrominance;

  593.     }

  594.     s->last_dc[component] = dc;

  595.     

  596.     /* AC coefs */

  597.     

  598.     run = 0;

  599.     last_index = s->block_last_index[n];

  600.     for(i=1;i<=last_index;i++) {

  601.         j = s->intra_scantable.permutated[i];

  602.         val = block[j];

  603.         if (val == 0) {

  604.             run++;

  605.         } else {

  606.             while (run >= 16) {

  607.                 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);

  608.                 run -= 16;

  609.             }

  610.             mant = val;

  611.             if (val < 0) {

  612.                 val = -val;

  613.                 mant--;

  614.             }

  615.             

  616.             /* compute the log (XXX: optimize) */

  617.             nbits = 0;

  618.             while (val != 0) {

  619.                 val = val >> 1;

  620.                 nbits++;

  621.             }

  622.             code = (run << 4) | nbits;

  623. 

  624.             put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);

  625.         

  626.             put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));

  627.             run = 0;

  628.         }

  629.     }

  630. 

  631.     /* output EOB only if not already 64 values */

  632.     if (last_index < 63 || run != 0)

  633.         put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);

  634. }

  635. 

  636. void mjpeg_encode_mb(MpegEncContext *s, 

  637.                      DCTELEM block[6][64])

  638. {

  639.     int i;

  640.     for(i=0;i<6;i++) {

  641.         encode_block(s, block[i], i);

  642.     }

  643. }

  644. 

  645. /******************************************/

  646. /* decoding */

  647. 

  648. #define MAX_COMPONENTS 4

  649. 

  650. typedef struct MJpegDecodeContext {

  651.     AVCodecContext *avctx;

  652.     GetBitContext gb;

  653.     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */

  654. 

  655.     int start_code; /* current start code */

  656.     int buffer_size;

  657.     uint8_t *buffer;

  658. 

  659.     int16_t quant_matrixes[4][64];

  660.     VLC vlcs[2][4];

  661. 

  662.     int org_width, org_height;  /* size given at codec init */

  663.     int first_picture;    /* true if decoding first picture */

  664.     int interlaced;     /* true if interlaced */

  665.     int bottom_field;   /* true if bottom field */

  666. 

  667.     int width, height;

  668.     int nb_components;

  669.     int component_id[MAX_COMPONENTS];

  670.     int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */

  671.     int v_count[MAX_COMPONENTS];

  672.     int h_max, v_max; /* maximum h and v counts */

  673.     int quant_index[4];   /* quant table index for each component */

  674.     int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */

  675.     uint8_t *current_picture[MAX_COMPONENTS]; /* picture structure */

  676.     int linesize[MAX_COMPONENTS];

  677.     DCTELEM block[64] __align8;

  678.     ScanTable scantable;

  679.     void (*idct_put)(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);

  680. 

  681.     int restart_interval;

  682.     int restart_count;

  683. 

  684.     int buggy_avid;

  685.     int interlace_polarity;

  686. } MJpegDecodeContext;

  687. 

  688. static int mjpeg_decode_dht(MJpegDecodeContext *s);

  689. 

  690. static void build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, 

  691.                       int nb_codes)

  692. {

  693.     uint8_t huff_size[256];

  694.     uint16_t huff_code[256];

  695. 

  696.     memset(huff_size, 0, sizeof(huff_size));

  697.     build_huffman_codes(huff_size, huff_code, bits_table, val_table);

  698.     

  699.     init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2);

  700. }

  701. 

  702. static int mjpeg_decode_init(AVCodecContext *avctx)

  703. {

  704.     MJpegDecodeContext *s = avctx->priv_data;

  705.     MpegEncContext s2;

  706. 

  707.     s->avctx = avctx;

  708. 

  709.     /* ugly way to get the idct & scantable FIXME */

  710.     memset(&s2, 0, sizeof(MpegEncContext));

  711.     s2.flags= avctx->flags;

  712.     s2.avctx= avctx;

  713. //    s2->out_format = FMT_MJPEG;

  714.     s2.width = 8;

  715.     s2.height = 8;

  716.     if (MPV_common_init(&s2) < 0)

  717.        return -1;

  718.     s->scantable= s2.intra_scantable;

  719.     s->idct_put= s2.dsp.idct_put;

  720.     MPV_common_end(&s2);

  721. 

  722.     s->mpeg_enc_ctx_allocated = 0;

  723.     s->buffer_size = 102400; /* smaller buffer should be enough,

  724. 				but photojpg files could ahive bigger sizes */

  725.     s->buffer = av_malloc(s->buffer_size);

  726.     if (!s->buffer)

  727. 	return -1;

  728.     s->start_code = -1;

  729.     s->first_picture = 1;

  730.     s->org_width = avctx->width;

  731.     s->org_height = avctx->height;

  732.     

  733.     build_vlc(&s->vlcs[0][0], bits_dc_luminance, val_dc_luminance, 12);

  734.     build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12);

  735.     build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251);

  736.     build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251);

  737. 

  738.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  739.     {

  740. 	printf("mjpeg: using external huffman table\n");

  741. 	init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);

  742. 	mjpeg_decode_dht(s);

  743. 	/* should check for error - but dunno */

  744.     }

  745. 

  746.     return 0;

  747. }

  748. 

  749. /* quantize tables */

  750. static int mjpeg_decode_dqt(MJpegDecodeContext *s)

  751. {

  752.     int len, index, i, j;

  753.     

  754.     len = get_bits(&s->gb, 16) - 2;

  755. 

  756.     while (len >= 65) {

  757.         /* only 8 bit precision handled */

  758.         if (get_bits(&s->gb, 4) != 0)

  759. 	{

  760. 	    dprintf("dqt: 16bit precision\n");

  761.             return -1;

  762. 	}

  763.         index = get_bits(&s->gb, 4);

  764.         if (index >= 4)

  765.             return -1;

  766.         dprintf("index=%d\n", index);

  767.         /* read quant table */

  768.         for(i=0;i<64;i++) {

  769.             j = s->scantable.permutated[i];

  770. 	    s->quant_matrixes[index][j] = get_bits(&s->gb, 8);

  771.         }

  772.         len -= 65;

  773.     }

  774.     

  775.     return 0;

  776. }

  777. 

  778. /* decode huffman tables and build VLC decoders */

  779. static int mjpeg_decode_dht(MJpegDecodeContext *s)

  780. {

  781.     int len, index, i, class, n, v, code_max;

  782.     uint8_t bits_table[17];

  783.     uint8_t val_table[256];

  784.     

  785.     len = get_bits(&s->gb, 16) - 2;

  786. 

  787.     while (len > 0) {

  788.         if (len < 17)

  789.             return -1;

  790.         class = get_bits(&s->gb, 4);

  791.         if (class >= 2)

  792.             return -1;

  793.         index = get_bits(&s->gb, 4);

  794.         if (index >= 4)

  795.             return -1;

  796.         n = 0;

  797.         for(i=1;i<=16;i++) {

  798.             bits_table[i] = get_bits(&s->gb, 8);

  799.             n += bits_table[i];

  800.         }

  801.         len -= 17;

  802.         if (len < n || n > 256)

  803.             return -1;

  804. 

  805.         code_max = 0;

  806.         for(i=0;i<n;i++) {

  807.             v = get_bits(&s->gb, 8);

  808.             if (v > code_max)

  809.                 code_max = v;

  810.             val_table[i] = v;

  811.         }

  812.         len -= n;

  813. 

  814.         /* build VLC and flush previous vlc if present */

  815.         free_vlc(&s->vlcs[class][index]);

  816.         dprintf("class=%d index=%d nb_codes=%d\n",

  817.                class, index, code_max + 1);

  818.         build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1);

  819.     }

  820.     return 0;

  821. }

  822. 

  823. static int mjpeg_decode_sof0(MJpegDecodeContext *s)

  824. {

  825.     int len, nb_components, i, width, height;

  826. 

  827.     /* XXX: verify len field validity */

  828.     len = get_bits(&s->gb, 16);

  829.     /* only 8 bits/component accepted */

  830.     if (get_bits(&s->gb, 8) != 8)

  831.         return -1;

  832.     height = get_bits(&s->gb, 16);

  833.     width = get_bits(&s->gb, 16);

  834.     dprintf("sof0: picture: %dx%d\n", width, height);

  835. 

  836.     nb_components = get_bits(&s->gb, 8);

  837.     if (nb_components <= 0 ||

  838.         nb_components > MAX_COMPONENTS)

  839.         return -1;

  840.     s->nb_components = nb_components;

  841.     s->h_max = 1;

  842.     s->v_max = 1;

  843.     for(i=0;i<nb_components;i++) {

  844.         /* component id */

  845.         s->component_id[i] = get_bits(&s->gb, 8) - 1;

  846.         s->h_count[i] = get_bits(&s->gb, 4);

  847.         s->v_count[i] = get_bits(&s->gb, 4);

  848.         /* compute hmax and vmax (only used in interleaved case) */

  849.         if (s->h_count[i] > s->h_max)

  850.             s->h_max = s->h_count[i];

  851.         if (s->v_count[i] > s->v_max)

  852.             s->v_max = s->v_count[i];

  853.         s->quant_index[i] = get_bits(&s->gb, 8);

  854.         if (s->quant_index[i] >= 4)

  855.             return -1;

  856.         dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],

  857. 	    s->v_count[i], s->component_id[i], s->quant_index[i]);

  858.     }

  859. 

  860.     /* if different size, realloc/alloc picture */

  861.     /* XXX: also check h_count and v_count */

  862.     if (width != s->width || height != s->height) {

  863.         for(i=0;i<MAX_COMPONENTS;i++)

  864.             av_freep(&s->current_picture[i]);

  865.         s->width = width;

  866.         s->height = height;

  867.         /* test interlaced mode */

  868.         if (s->first_picture &&

  869.             s->org_height != 0 &&

  870.             s->height < ((s->org_height * 3) / 4)) {

  871.             s->interlaced = 1;

  872. //	    s->bottom_field = (s->interlace_polarity) ? 1 : 0;

  873. 	    s->bottom_field = 0;

  874.         }

  875. 

  876.         for(i=0;i<nb_components;i++) {

  877.             int w, h;

  878.             w = (s->width  + 8 * s->h_max - 1) / (8 * s->h_max);

  879.             h = (s->height + 8 * s->v_max - 1) / (8 * s->v_max);

  880.             w = w * 8 * s->h_count[i];

  881.             h = h * 8 * s->v_count[i];

  882.             if (s->interlaced)

  883.                 w *= 2;

  884.             s->linesize[i] = w;

  885.             s->current_picture[i] = av_mallocz(w * h);

  886. 	    if (!s->current_picture[i])

  887. 	    {

  888. 		dprintf("error: no picture buffers allocated\n");

  889. 		return -1;

  890. 	    }

  891.         }

  892.         s->first_picture = 0;

  893.     }

  894. 

  895.     if (len != (8+(3*nb_components)))

  896.     {

  897. 	dprintf("decode_sof0: error, len(%d) mismatch\n", len);

  898.     }

  899.     

  900.     return 0;

  901. }

  902. 

  903. static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)

  904. {

  905.     int code, diff;

  906. #if 1

  907.     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);

  908. #else

  909.     code = get_vlc(&s->gb, &s->vlcs[0][dc_index]);

  910. #endif

  911.     if (code < 0)

  912.     {

  913. 	dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,

  914.                 &s->vlcs[0][dc_index]);

  915.         return 0xffff;

  916.     }

  917.     if (code == 0) {

  918.         diff = 0;

  919.     } else {

  920.         diff = get_bits(&s->gb, code);

  921.         if ((diff & (1 << (code - 1))) == 0) 

  922.             diff = (-1 << code) | (diff + 1);

  923.     }

  924.     return diff;

  925. }

  926. 

  927. /* decode block and dequantize */

  928. static int decode_block(MJpegDecodeContext *s, DCTELEM *block, 

  929.                         int component, int dc_index, int ac_index, int quant_index)

  930. {

  931.     int nbits, code, i, j, level;

  932.     int run, val;

  933.     VLC *ac_vlc;

  934.     int16_t *quant_matrix;

  935. 

  936.     /* DC coef */

  937.     val = mjpeg_decode_dc(s, dc_index);

  938.     if (val == 0xffff) {

  939.         dprintf("error dc\n");

  940.         return -1;

  941.     }

  942.     quant_matrix = s->quant_matrixes[quant_index];

  943.     val = val * quant_matrix[0] + s->last_dc[component];

  944.     s->last_dc[component] = val;

  945.     block[0] = val;

  946.     /* AC coefs */

  947.     ac_vlc = &s->vlcs[1][ac_index];

  948.     i = 1;

  949.     for(;;) {

  950. #if 1

  951. 	code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table, 9, 2);

  952. #else

  953.         code = get_vlc(&s->gb, ac_vlc);

  954. #endif

  955.         if (code < 0) {

  956.             dprintf("error ac\n");

  957.             return -1;

  958.         }

  959.         /* EOB */

  960.         if (code == 0)

  961.             break;

  962.         if (code == 0xf0) {

  963.             i += 16;

  964.         } else {

  965.             run = code >> 4;

  966.             nbits = code & 0xf;

  967.             level = get_bits(&s->gb, nbits);

  968.             if ((level & (1 << (nbits - 1))) == 0) 

  969.                 level = (-1 << nbits) | (level + 1);

  970.             i += run;

  971.             if (i >= 64) {

  972.                 dprintf("error count: %d\n", i);

  973.                 return -1;

  974.             }

  975.             j = s->scantable.permutated[i];

  976.             block[j] = level * quant_matrix[j];

  977.             i++;

  978.             if (i >= 64)

  979.                 break;

  980.         }

  981.     }

  982.     return 0;

  983. }

  984. 

  985. static int mjpeg_decode_sos(MJpegDecodeContext *s)

  986. {

  987.     int len, nb_components, i, j, n, h, v, ret;

  988.     int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id;

  989.     int comp_index[4];

  990.     int dc_index[4];

  991.     int ac_index[4];

  992.     int nb_blocks[4];

  993.     int h_count[4];

  994.     int v_count[4];

  995.     

  996.     /* XXX: verify len field validity */

  997.     len = get_bits(&s->gb, 16);

  998.     nb_components = get_bits(&s->gb, 8);

  999.     if (len != 6+2*nb_components)

  1000.     {

  1001. 	dprintf("decode_sos: invalid len (%d)\n", len);

  1002. 	return -1;

  1003.     }

  1004.     /* XXX: only interleaved scan accepted */

  1005.     if (nb_components != 3)

  1006.     {

  1007. 	dprintf("decode_sos: components(%d) mismatch\n", nb_components);

  1008.         return -1;

  1009.     }

  1010.     vmax = 0;

  1011.     hmax = 0;

  1012.     for(i=0;i<nb_components;i++) {

  1013.         id = get_bits(&s->gb, 8) - 1;

  1014. 	dprintf("component: %d\n", id);

  1015.         /* find component index */

  1016.         for(index=0;index<s->nb_components;index++)

  1017.             if (id == s->component_id[index])

  1018.                 break;

  1019.         if (index == s->nb_components)

  1020. 	{

  1021. 	    dprintf("decode_sos: index(%d) out of components\n", index);

  1022.             return -1;

  1023. 	}

  1024. 

  1025.         comp_index[i] = index;

  1026.         nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1027.         h_count[i] = s->h_count[index];

  1028.         v_count[i] = s->v_count[index];

  1029. 

  1030.         dc_index[i] = get_bits(&s->gb, 4);

  1031.         ac_index[i] = get_bits(&s->gb, 4);

  1032. 

  1033. 	if (dc_index[i] < 0 || ac_index[i] < 0 ||

  1034. 	    dc_index[i] >= 4 || ac_index[i] >= 4)

  1035. 	    goto out_of_range;

  1036. 	switch(s->start_code)

  1037. 	{

  1038. 	    case SOF0:

  1039. 		if (dc_index[i] > 1 || ac_index[i] > 1)

  1040. 		    goto out_of_range;

  1041. 		break;

  1042. 	    case SOF1:

  1043. 	    case SOF2:

  1044. 		if (dc_index[i] > 3 || ac_index[i] > 3)

  1045. 		    goto out_of_range;

  1046. 		break;

  1047. 	    case SOF3:

  1048. 		if (dc_index[i] > 3 || ac_index[i] != 0)

  1049. 		    goto out_of_range;

  1050. 		break;	

  1051. 	}

  1052.     }

  1053.     skip_bits(&s->gb, 8); /* Ss */

  1054.     skip_bits(&s->gb, 8); /* Se */

  1055.     skip_bits(&s->gb, 8); /* Ah and Al (each are 4 bits) */

  1056. 

  1057.     for(i=0;i<nb_components;i++) 

  1058.         s->last_dc[i] = 1024;

  1059. 

  1060.     if (nb_components > 1) {

  1061.         /* interleaved stream */

  1062.         mb_width = (s->width + s->h_max * 8 - 1) / (s->h_max * 8);

  1063.         mb_height = (s->height + s->v_max * 8 - 1) / (s->v_max * 8);

  1064.     } else {

  1065.         h = s->h_max / s->h_count[comp_index[0]];

  1066.         v = s->v_max / s->v_count[comp_index[0]];

  1067.         mb_width = (s->width + h * 8 - 1) / (h * 8);

  1068.         mb_height = (s->height + v * 8 - 1) / (v * 8);

  1069.         nb_blocks[0] = 1;

  1070.         h_count[0] = 1;

  1071.         v_count[0] = 1;

  1072.     }

  1073.     

  1074.     for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1075.         for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1076.             for(i=0;i<nb_components;i++) {

  1077.                 uint8_t *ptr;

  1078.                 int x, y, c;

  1079.                 n = nb_blocks[i];

  1080.                 c = comp_index[i];

  1081.                 h = h_count[i];

  1082.                 v = v_count[i];

  1083.                 x = 0;

  1084.                 y = 0;

  1085. 		if (s->restart_interval && !s->restart_count)

  1086. 		    s->restart_count = s->restart_interval;

  1087.                 for(j=0;j<n;j++) {

  1088.                     memset(s->block, 0, sizeof(s->block));

  1089.                     if (decode_block(s, s->block, i, 

  1090.                                      dc_index[i], ac_index[i], 

  1091.                                      s->quant_index[c]) < 0) {

  1092.                         dprintf("error y=%d x=%d\n", mb_y, mb_x);

  1093.                         ret = -1;

  1094.                         goto the_end;

  1095.                     }

  1096. //		    dprintf("mb: %d %d processed\n", mb_y, mb_x);

  1097.                     ptr = s->current_picture[c] + 

  1098.                         (s->linesize[c] * (v * mb_y + y) * 8) + 

  1099.                         (h * mb_x + x) * 8;

  1100.                     if (s->interlaced && s->bottom_field)

  1101.                         ptr += s->linesize[c] >> 1;

  1102.                     s->idct_put(ptr, s->linesize[c], s->block);

  1103.                     if (++x == h) {

  1104.                         x = 0;

  1105.                         y++;

  1106.                     }

  1107.                 }

  1108.             }

  1109. 	    /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

  1110.             if (s->restart_interval && (s->restart_interval < 1350) &&

  1111. 		!--s->restart_count) {

  1112.                 align_get_bits(&s->gb);

  1113.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1114.                 for (j=0; j<nb_components; j++) /* reset dc */

  1115.                     s->last_dc[j] = 1024;

  1116.             }

  1117.         }

  1118.     }

  1119.     ret = 0;

  1120.  the_end:

  1121.     emms_c();

  1122.     return ret;

  1123.  out_of_range:

  1124.     dprintf("decode_sos: ac/dc index out of range\n");

  1125.     return -1;

  1126. }

  1127. 

  1128. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1129. {

  1130.     if (get_bits(&s->gb, 16) != 4)

  1131. 	return -1;

  1132.     s->restart_interval = get_bits(&s->gb, 16);

  1133.     dprintf("restart interval: %d\n", s->restart_interval);

  1134. 

  1135.     return 0;

  1136. }

  1137. 

  1138. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1139. {

  1140.     int len, id;

  1141. 

  1142.     /* XXX: verify len field validity */

  1143.     len = get_bits(&s->gb, 16);

  1144.     if (len < 5)

  1145. 	return -1;

  1146. 

  1147.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1148.     id = be2me_32(id);

  1149.     len -= 6;

  1150. 

  1151.     /* buggy AVID, it puts EOI only at every 10th frame */

  1152.     /* also this fourcc is used by non-avid files too, it holds some

  1153.        informations, but it's always present in AVID creates files */

  1154.     if (id == ff_get_fourcc("AVI1"))

  1155.     {

  1156. 	/* structure:

  1157. 	    4bytes	AVI1

  1158. 	    1bytes	polarity

  1159. 	    1bytes	always zero

  1160. 	    4bytes	field_size

  1161. 	    4bytes	field_size_less_padding

  1162. 	*/

  1163.     	s->buggy_avid = 1;

  1164. //	if (s->first_picture)

  1165. //	    printf("mjpeg: workarounding buggy AVID\n");

  1166. 	s->interlace_polarity = get_bits(&s->gb, 8);

  1167. #if 0

  1168. 	skip_bits(&s->gb, 8);

  1169. 	skip_bits(&s->gb, 32);

  1170. 	skip_bits(&s->gb, 32);

  1171. 	len -= 10;

  1172. #endif

  1173. //	if (s->interlace_polarity)

  1174. //	    printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1175. 	goto out;

  1176.     }

  1177.     

  1178. //    len -= 2;

  1179.     

  1180.     if (id == ff_get_fourcc("JFIF"))

  1181.     {

  1182. 	int t_w, t_h;

  1183. 	skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1184. 	printf("mjpeg: JFIF header found (version: %x.%x)\n",

  1185. 	    get_bits(&s->gb, 8), get_bits(&s->gb, 8));

  1186. 	if (get_bits(&s->gb, 8) == 0)

  1187. 	{

  1188. 	    int x_density, y_density; 

  1189. 	    x_density = get_bits(&s->gb, 16);

  1190. 	    y_density = get_bits(&s->gb, 16);

  1191. 

  1192. 	    dprintf("x/y density: %d (%f), %d (%f)\n", x_density,

  1193. 		(float)x_density, y_density, (float)y_density);

  1194. #if 0

  1195.             //MN: needs to be checked

  1196.             if(x_density)

  1197. //                s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);

  1198. 		s->avctx->aspect_ratio = (float)x_density/y_density;

  1199. 		/* it's better, but every JFIF I have seen stores 1:1 */

  1200.             else

  1201.                 s->avctx->aspect_ratio= 0.0;

  1202. #endif

  1203. 	}

  1204. 	else

  1205. 	{

  1206. 	    skip_bits(&s->gb, 16);

  1207. 	    skip_bits(&s->gb, 16);

  1208. 	}

  1209. 

  1210. 	t_w = get_bits(&s->gb, 8);

  1211. 	t_h = get_bits(&s->gb, 8);

  1212. 	if (t_w && t_h)

  1213. 	{

  1214. 	    /* skip thumbnail */

  1215. 	    if (len-10-(t_w*t_h*3) > 0)

  1216. 		len -= t_w*t_h*3;

  1217. 	}

  1218. 	len -= 10;

  1219. 	goto out;

  1220.     }

  1221.     

  1222.     if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1223.     {

  1224. 	printf("mjpeg: Adobe header found\n");

  1225. 	skip_bits(&s->gb, 16); /* version */

  1226. 	skip_bits(&s->gb, 16); /* flags0 */

  1227. 	skip_bits(&s->gb, 16); /* flags1 */

  1228. 	skip_bits(&s->gb, 8); /* transform */

  1229. 	len -= 7;

  1230. 	goto out;

  1231.     }

  1232.     

  1233.     /* Apple MJPEG-A */

  1234.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1235.     {

  1236. 	id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1237. 	id = be2me_32(id);

  1238. 	len -= 4;

  1239. 	if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */

  1240. 	{

  1241. #if 0

  1242. 	    skip_bits(&s->gb, 32); /* field size */

  1243. 	    skip_bits(&s->gb, 32); /* pad field size */

  1244. 	    skip_bits(&s->gb, 32); /* next off */

  1245. 	    skip_bits(&s->gb, 32); /* quant off */

  1246. 	    skip_bits(&s->gb, 32); /* huff off */

  1247. 	    skip_bits(&s->gb, 32); /* image off */

  1248. 	    skip_bits(&s->gb, 32); /* scan off */

  1249. 	    skip_bits(&s->gb, 32); /* data off */

  1250. #endif

  1251. 	    if (s->first_picture)

  1252. 		printf("mjpeg: Apple MJPEG-A header found\n");

  1253. 	}

  1254.     }

  1255. 

  1256. out:

  1257.     /* slow but needed for extreme adobe jpegs */

  1258.     if (len < 0)

  1259. 	printf("mjpeg: error, decode_app parser read over the end\n");

  1260.     while(--len > 0)

  1261. 	skip_bits(&s->gb, 8);

  1262. 

  1263.     return 0;

  1264. }

  1265. 

  1266. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1267. {

  1268.     /* XXX: verify len field validity */

  1269.     unsigned int len = get_bits(&s->gb, 16);

  1270.     if (len >= 2 && len < 32768) {

  1271. 	/* XXX: any better upper bound */

  1272. 	uint8_t *cbuf = av_malloc(len - 1);

  1273. 	if (cbuf) {

  1274. 	    int i;

  1275. 	    for (i = 0; i < len - 2; i++)

  1276. 		cbuf[i] = get_bits(&s->gb, 8);

  1277. 	    if (i > 0 && cbuf[i-1] == '\n')

  1278. 		cbuf[i-1] = 0;

  1279. 	    else

  1280. 		cbuf[i] = 0;

  1281. 

  1282. 	    printf("mjpeg comment: '%s'\n", cbuf);

  1283. 

  1284. 	    /* buggy avid, it puts EOI only at every 10th frame */

  1285. 	    if (!strcmp(cbuf, "AVID"))

  1286. 	    {

  1287. 		s->buggy_avid = 1;

  1288. 		//	if (s->first_picture)

  1289. 		//	    printf("mjpeg: workarounding buggy AVID\n");

  1290. 	    }

  1291. 

  1292. 	    av_free(cbuf);

  1293. 	}

  1294.     }

  1295. 

  1296.     return 0;

  1297. }

  1298. 

  1299. #if 0

  1300. static int valid_marker_list[] =

  1301. {

  1302.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1303. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1304. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1305. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1306. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1307. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1308. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1309. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1310. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1311. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1312. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1313. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1314. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1315. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1316. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1317. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1318. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1319. }

  1320. #endif

  1321. 

  1322. /* return the 8 bit start code value and update the search

  1323.    state. Return -1 if no start code found */

  1324. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1325. {

  1326.     uint8_t *buf_ptr;

  1327.     unsigned int v, v2;

  1328.     int val;

  1329. #ifdef DEBUG

  1330.     int skipped=0;

  1331. #endif

  1332. 

  1333.     buf_ptr = *pbuf_ptr;

  1334.     while (buf_ptr < buf_end) {

  1335.         v = *buf_ptr++;

  1336. 	v2 = *buf_ptr;

  1337.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {

  1338. 	    val = *buf_ptr++;

  1339. 	    goto found;

  1340.         }

  1341. #ifdef DEBUG

  1342. 	skipped++;

  1343. #endif

  1344.     }

  1345.     val = -1;

  1346. found:

  1347. #ifdef DEBUG

  1348.     dprintf("find_marker skipped %d bytes\n", skipped);

  1349. #endif

  1350.     *pbuf_ptr = buf_ptr;

  1351.     return val;

  1352. }

  1353. 

  1354. static int mjpeg_decode_frame(AVCodecContext *avctx, 

  1355.                               void *data, int *data_size,

  1356.                               uint8_t *buf, int buf_size)

  1357. {

  1358.     MJpegDecodeContext *s = avctx->priv_data;

  1359.     uint8_t *buf_end, *buf_ptr;

  1360.     int i, start_code;

  1361.     AVPicture *picture = data;

  1362. 

  1363.     *data_size = 0;

  1364. 

  1365.     /* no supplementary picture */

  1366.     if (buf_size == 0)

  1367.         return 0;

  1368. 

  1369.     buf_ptr = buf;

  1370.     buf_end = buf + buf_size;

  1371.     while (buf_ptr < buf_end) {

  1372.         /* find start next marker */

  1373.         start_code = find_marker(&buf_ptr, buf_end);

  1374. 	{

  1375. 	    /* EOF */

  1376.             if (start_code < 0) {

  1377. 		goto the_end;

  1378.             } else {

  1379.                 dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);

  1380. 		

  1381. 		if ((buf_end - buf_ptr) > s->buffer_size)

  1382. 		{

  1383. 		    av_free(s->buffer);

  1384. 		    s->buffer_size = buf_end-buf_ptr;

  1385. 		    s->buffer = av_malloc(s->buffer_size);

  1386. 		    dprintf("buffer too small, expanding to %d bytes\n",

  1387. 			s->buffer_size);

  1388. 		}

  1389. 		

  1390. 		/* unescape buffer of SOS */

  1391. 		if (start_code == SOS)

  1392. 		{

  1393. 		    uint8_t *src = buf_ptr;

  1394. 		    uint8_t *dst = s->buffer;

  1395. 

  1396. 		    while (src<buf_end)

  1397. 		    {

  1398. 			uint8_t x = *(src++);

  1399. 

  1400. 			*(dst++) = x;

  1401. 			if (x == 0xff)

  1402. 			{

  1403. 			    while(*src == 0xff) src++;

  1404. 

  1405. 			    x = *(src++);

  1406. 			    if (x >= 0xd0 && x <= 0xd7)

  1407. 				*(dst++) = x;

  1408. 			    else if (x)

  1409. 				break;

  1410. 			}

  1411. 		    }

  1412. 		    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1413. 		    

  1414. 		    dprintf("escaping removed %d bytes\n",

  1415. 			(buf_end - buf_ptr) - (dst - s->buffer));

  1416. 		}

  1417. 		else

  1418. 		    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1419. 		

  1420. 		s->start_code = start_code;

  1421. 

  1422. 		/* process markers */

  1423. 		if (start_code >= 0xd0 && start_code <= 0xd7) {

  1424. 		    dprintf("restart marker: %d\n", start_code&0x0f);

  1425. 		} else if (s->first_picture) {

  1426. 		    /* APP fields */

  1427. 		    if (start_code >= 0xe0 && start_code <= 0xef)

  1428. 			mjpeg_decode_app(s);

  1429. 		    /* Comment */

  1430. 		    else if (start_code == COM)

  1431. 			mjpeg_decode_com(s);

  1432. 		}

  1433. 

  1434.                 switch(start_code) {

  1435.                 case SOI:

  1436. 		    s->restart_interval = 0;

  1437.                     /* nothing to do on SOI */

  1438.                     break;

  1439.                 case DQT:

  1440.                     mjpeg_decode_dqt(s);

  1441.                     break;

  1442.                 case DHT:

  1443.                     mjpeg_decode_dht(s);

  1444.                     break;

  1445.                 case SOF0:

  1446.                     if (mjpeg_decode_sof0(s) < 0)

  1447. 			return -1;

  1448.                     break;

  1449. 		case EOI:

  1450. eoi_parser:

  1451. 		    {

  1452.                         if (s->interlaced) {

  1453.                             s->bottom_field ^= 1;

  1454.                             /* if not bottom field, do not output image yet */

  1455.                             if (s->bottom_field)

  1456.                                 goto not_the_end;

  1457.                         }

  1458.                         for(i=0;i<3;i++) {

  1459.                             picture->data[i] = s->current_picture[i];

  1460. 			    picture->linesize[i] = (s->interlaced) ?

  1461. 				s->linesize[i] >> 1 : s->linesize[i];

  1462.                         }

  1463.                         *data_size = sizeof(AVPicture);

  1464.                         avctx->height = s->height;

  1465.                         if (s->interlaced)

  1466.                             avctx->height *= 2;

  1467.                         avctx->width = s->width;

  1468.                         /* XXX: not complete test ! */

  1469.                         switch((s->h_count[0] << 4) | s->v_count[0]) {

  1470.                         case 0x11:

  1471.                             avctx->pix_fmt = PIX_FMT_YUV444P;

  1472.                             break;

  1473.                         case 0x21:

  1474.                             avctx->pix_fmt = PIX_FMT_YUV422P;

  1475.                             break;

  1476.                         default:

  1477.                         case 0x22:

  1478.                             avctx->pix_fmt = PIX_FMT_YUV420P;

  1479.                             break;

  1480.                         }

  1481.                         /* dummy quality */

  1482.                         /* XXX: infer it with matrix */

  1483. //                    	avctx->quality = 3; 

  1484.                         goto the_end;

  1485.                     }

  1486. 		    break;

  1487.                 case SOS:

  1488.                     mjpeg_decode_sos(s);

  1489. 		    /* buggy avid puts EOI every 10-20th frame */

  1490. 		    /* if restart period is over process EOI */

  1491. 		    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1492. 			goto eoi_parser;

  1493.                     break;

  1494. 		case DRI:

  1495. 		    mjpeg_decode_dri(s);

  1496. 		    break;

  1497. 		case SOF1:

  1498. 		case SOF2:

  1499. 		case SOF3:

  1500. 		case SOF5:

  1501. 		case SOF6:

  1502. 		case SOF7:

  1503. 		case SOF9:

  1504. 		case SOF10:

  1505. 		case SOF11:

  1506. 		case SOF13:

  1507. 		case SOF14:

  1508. 		case SOF15:

  1509. 		case JPG:

  1510. 		    printf("mjpeg: unsupported coding type (%x)\n", start_code);

  1511. 		    break;

  1512. //		default:

  1513. //		    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1514. //		    break;

  1515.                 }

  1516. 

  1517. not_the_end:

  1518. 		/* eof process start code */

  1519. 		buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1520. 		dprintf("marker parser used %d bytes (%d bits)\n",

  1521. 		    (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1522.             }

  1523.         }

  1524.     }

  1525. the_end:

  1526.     dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);

  1527. //    return buf_end - buf_ptr;

  1528.     return buf_ptr - buf;

  1529. }

  1530. 

  1531. static int mjpegb_decode_frame(AVCodecContext *avctx, 

  1532.                               void *data, int *data_size,

  1533.                               uint8_t *buf, int buf_size)

  1534. {

  1535.     MJpegDecodeContext *s = avctx->priv_data;

  1536.     uint8_t *buf_end, *buf_ptr;

  1537.     int i;

  1538.     AVPicture *picture = data;

  1539.     GetBitContext hgb; /* for the header */

  1540.     uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

  1541.     uint32_t field_size;

  1542. 

  1543.     *data_size = 0;

  1544. 

  1545.     /* no supplementary picture */

  1546.     if (buf_size == 0)

  1547.         return 0;

  1548. 

  1549.     buf_ptr = buf;

  1550.     buf_end = buf + buf_size;

  1551.     

  1552. read_header:

  1553.     /* reset on every SOI */

  1554.     s->restart_interval = 0;

  1555. 

  1556.     init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);

  1557. 

  1558.     skip_bits(&hgb, 32); /* reserved zeros */

  1559.     

  1560.     if (get_bits(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

  1561.     {

  1562. 	dprintf("not mjpeg-b (bad fourcc)\n");

  1563. 	return 0;

  1564.     }

  1565. 

  1566.     field_size = get_bits(&hgb, 32); /* field size */

  1567.     dprintf("field size: 0x%x\n", field_size);

  1568.     skip_bits(&hgb, 32); /* padded field size */

  1569.     second_field_offs = get_bits(&hgb, 32);

  1570.     dprintf("second field offs: 0x%x\n", second_field_offs);

  1571.     if (second_field_offs)

  1572. 	s->interlaced = 1;

  1573. 

  1574.     dqt_offs = get_bits(&hgb, 32);

  1575.     dprintf("dqt offs: 0x%x\n", dqt_offs);

  1576.     if (dqt_offs)

  1577.     {

  1578. 	init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

  1579. 	s->start_code = DQT;

  1580. 	mjpeg_decode_dqt(s);

  1581.     }

  1582.     

  1583.     dht_offs = get_bits(&hgb, 32);

  1584.     dprintf("dht offs: 0x%x\n", dht_offs);

  1585.     if (dht_offs)

  1586.     {

  1587. 	init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

  1588. 	s->start_code = DHT;

  1589. 	mjpeg_decode_dht(s);

  1590.     }

  1591. 

  1592.     sof_offs = get_bits(&hgb, 32);

  1593.     dprintf("sof offs: 0x%x\n", sof_offs);

  1594.     if (sof_offs)

  1595.     {

  1596. 	init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

  1597. 	s->start_code = SOF0;

  1598. 	if (mjpeg_decode_sof0(s) < 0)

  1599. 	    return -1;

  1600.     }

  1601. 

  1602.     sos_offs = get_bits(&hgb, 32);

  1603.     dprintf("sos offs: 0x%x\n", sos_offs);

  1604.     if (sos_offs)

  1605.     {

  1606. //	init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);

  1607. 	init_get_bits(&s->gb, buf+sos_offs, field_size*8);

  1608. 	s->start_code = SOS;

  1609. 	mjpeg_decode_sos(s);

  1610.     }

  1611. 

  1612.     skip_bits(&hgb, 32); /* start of data offset */

  1613. 

  1614.     if (s->interlaced) {

  1615.         s->bottom_field ^= 1;

  1616.         /* if not bottom field, do not output image yet */

  1617.         if (s->bottom_field && second_field_offs)

  1618. 	{

  1619. 	    buf_ptr = buf + second_field_offs;

  1620. 	    second_field_offs = 0;

  1621. 	    goto read_header;

  1622.     	}

  1623.     }

  1624. 

  1625.     for(i=0;i<3;i++) {

  1626.         picture->data[i] = s->current_picture[i];

  1627.         picture->linesize[i] = (s->interlaced) ?

  1628.     	    s->linesize[i] >> 1 : s->linesize[i];

  1629.     }

  1630.     *data_size = sizeof(AVPicture);

  1631.     avctx->height = s->height;

  1632.     if (s->interlaced)

  1633.         avctx->height *= 2;

  1634.     avctx->width = s->width;

  1635.     /* XXX: not complete test ! */

  1636.     switch((s->h_count[0] << 4) | s->v_count[0]) {

  1637.         case 0x11:

  1638.     	    avctx->pix_fmt = PIX_FMT_YUV444P;

  1639.             break;

  1640.         case 0x21:

  1641.             avctx->pix_fmt = PIX_FMT_YUV422P;

  1642.             break;

  1643.         default:

  1644. 	case 0x22:

  1645.             avctx->pix_fmt = PIX_FMT_YUV420P;

  1646.             break;

  1647.     }

  1648.     /* dummy quality */

  1649.     /* XXX: infer it with matrix */

  1650. //    avctx->quality = 3; 

  1651. 

  1652.     return buf_ptr - buf;

  1653. }

  1654. 

  1655. 

  1656. static int mjpeg_decode_end(AVCodecContext *avctx)

  1657. {

  1658.     MJpegDecodeContext *s = avctx->priv_data;

  1659.     int i, j;

  1660. 

  1661.     av_free(s->buffer);

  1662.     for(i=0;i<MAX_COMPONENTS;i++)

  1663.         av_free(s->current_picture[i]);

  1664.     for(i=0;i<2;i++) {

  1665.         for(j=0;j<4;j++)

  1666.             free_vlc(&s->vlcs[i][j]);

  1667.     }

  1668.     return 0;

  1669. }

  1670. 

  1671. AVCodec mjpeg_decoder = {

  1672.     "mjpeg",

  1673.     CODEC_TYPE_VIDEO,

  1674.     CODEC_ID_MJPEG,

  1675.     sizeof(MJpegDecodeContext),

  1676.     mjpeg_decode_init,

  1677.     NULL,

  1678.     mjpeg_decode_end,

  1679.     mjpeg_decode_frame,

  1680.     0,

  1681.     NULL

  1682. };

  1683. 

  1684. AVCodec mjpegb_decoder = {

  1685.     "mjpegb",

  1686.     CODEC_TYPE_VIDEO,

  1687.     CODEC_ID_MJPEGB,

  1688.     sizeof(MJpegDecodeContext),

  1689.     mjpeg_decode_init,

  1690.     NULL,

  1691.     mjpeg_decode_end,

  1692.     mjpegb_decode_frame,

  1693.     0,

  1694.     NULL

  1695. };