falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
2197 Commits
32 Branches
313MB
Tree: 63efe9a7e6
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '63efe9a7e6'
${ noResults }
FFmpeg/libavcodec/mjpeg.c

1894 lines
55KB
Raw Blame History 

  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 <assert.h>

  31. 

  32. #include "avcodec.h"

  33. #include "dsputil.h"

  34. #include "mpegvideo.h"

  35. 

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

  37. /* not yet working */

  38. #undef TWOMATRIXES

  39. 

  40. typedef struct MJpegContext {

  41.     uint8_t huff_size_dc_luminance[12];

  42.     uint16_t huff_code_dc_luminance[12];

  43.     uint8_t huff_size_dc_chrominance[12];

  44.     uint16_t huff_code_dc_chrominance[12];

  45. 

  46.     uint8_t huff_size_ac_luminance[256];

  47.     uint16_t huff_code_ac_luminance[256];

  48.     uint8_t huff_size_ac_chrominance[256];

  49.     uint16_t huff_code_ac_chrominance[256];

  50. } MJpegContext;

  51. 

  52. /* JPEG marker codes */

  53. typedef enum {

  54.     /* start of frame */

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

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

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

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

  59. 

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

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

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

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

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

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

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

  67. 

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

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

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

  71. 

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

  73. 

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

  75. 

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

  77.     RST0  = 0xd0,

  78.     RST1  = 0xd1,

  79.     RST2  = 0xd2,

  80.     RST3  = 0xd3,

  81.     RST4  = 0xd4,

  82.     RST5  = 0xd5,

  83.     RST6  = 0xd6,

  84.     RST7  = 0xd7,

  85. 

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

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

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

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

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

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

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

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

  94. 

  95.     APP0  = 0xe0,

  96.     APP1  = 0xe1,

  97.     APP2  = 0xe2,

  98.     APP3  = 0xe3,

  99.     APP4  = 0xe4,

  100.     APP5  = 0xe5,

  101.     APP6  = 0xe6,

  102.     APP7  = 0xe7,

  103.     APP8  = 0xe8,

  104.     APP9  = 0xe9,

  105.     APP10 = 0xea,

  106.     APP11 = 0xeb,

  107.     APP12 = 0xec,

  108.     APP13 = 0xed,

  109.     APP14 = 0xee,

  110.     APP15 = 0xef,

  111. 

  112.     JPG0  = 0xf0,

  113.     JPG1  = 0xf1,

  114.     JPG2  = 0xf2,

  115.     JPG3  = 0xf3,

  116.     JPG4  = 0xf4,

  117.     JPG5  = 0xf5,

  118.     JPG6  = 0xf6,

  119.     JPG7  = 0xf7,

  120.     JPG8  = 0xf8,

  121.     JPG9  = 0xf9,

  122.     JPG10 = 0xfa,

  123.     JPG11 = 0xfb,

  124.     JPG12 = 0xfc,

  125.     JPG13 = 0xfd,

  126. 

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

  128. 

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

  130. 

  131.     /* 0x02 -> 0xbf reserved */

  132. } JPEG_MARKER;

  133. 

  134. #if 0

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

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

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

  138.  */

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

  140.     16,  11,  10,  16,  24,  40,  51,  61,

  141.     12,  12,  14,  19,  26,  58,  60,  55,

  142.     14,  13,  16,  24,  40,  57,  69,  56,

  143.     14,  17,  22,  29,  51,  87,  80,  62,

  144.     18,  22,  37,  56,  68, 109, 103,  77,

  145.     24,  35,  55,  64,  81, 104, 113,  92,

  146.     49,  64,  78,  87, 103, 121, 120, 101,

  147.     72,  92,  95,  98, 112, 100, 103,  99

  148. };

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

  150.     17,  18,  24,  47,  99,  99,  99,  99,

  151.     18,  21,  26,  66,  99,  99,  99,  99,

  152.     24,  26,  56,  99,  99,  99,  99,  99,

  153.     47,  66,  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.     99,  99,  99,  99,  99,  99,  99,  99,

  157.     99,  99,  99,  99,  99,  99,  99,  99

  158. };

  159. #endif

  160. 

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

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

  163. static const uint8_t bits_dc_luminance[17] =

  164. { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };

  165. static const uint8_t val_dc_luminance[] =

  166. { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  167. 

  168. static const uint8_t bits_dc_chrominance[17] =

  169. { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };

  170. static const uint8_t val_dc_chrominance[] =

  171. { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  172. 

  173. static const uint8_t bits_ac_luminance[17] =

  174. { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };

  175. static const uint8_t val_ac_luminance[] =

  176. { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,

  177.   0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,

  178.   0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,

  179.   0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,

  180.   0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,

  181.   0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,

  182.   0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,

  183.   0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,

  184.   0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,

  185.   0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  186.   0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  187.   0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,

  188.   0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,

  189.   0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,

  190.   0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,

  191.   0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,

  192.   0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,

  193.   0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,

  194.   0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,

  195.   0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

  196.   0xf9, 0xfa 

  197. };

  198. 

  199. static const uint8_t bits_ac_chrominance[17] =

  200. { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };

  201. 

  202. static const uint8_t val_ac_chrominance[] =

  203. { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,

  204.   0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,

  205.   0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,

  206.   0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,

  207.   0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,

  208.   0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,

  209.   0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,

  210.   0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,

  211.   0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,

  212.   0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,

  213.   0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,

  214.   0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,

  215.   0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,

  216.   0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,

  217.   0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,

  218.   0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,

  219.   0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,

  220.   0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,

  221.   0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,

  222.   0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

  223.   0xf9, 0xfa 

  224. };

  225. 

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

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

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

  229. {

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

  231. 

  232.     code = 0;

  233.     k = 0;

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

  235.         nb = bits_table[i];

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

  237.             sym = val_table[k++];

  238.             huff_size[sym] = i;

  239.             huff_code[sym] = code;

  240.             code++;

  241.         }

  242.         code <<= 1;

  243.     }

  244. }

  245. 

  246. int mjpeg_init(MpegEncContext *s)

  247. {

  248.     MJpegContext *m;

  249.     

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

  251.     if (!m)

  252.         return -1;

  253.     

  254.     s->min_qcoeff=-1023;

  255.     s->max_qcoeff= 1023;

  256. 

  257.     /* build all the huffman tables */

  258.     build_huffman_codes(m->huff_size_dc_luminance,

  259.                         m->huff_code_dc_luminance,

  260.                         bits_dc_luminance,

  261.                         val_dc_luminance);

  262.     build_huffman_codes(m->huff_size_dc_chrominance,

  263.                         m->huff_code_dc_chrominance,

  264.                         bits_dc_chrominance,

  265.                         val_dc_chrominance);

  266.     build_huffman_codes(m->huff_size_ac_luminance,

  267.                         m->huff_code_ac_luminance,

  268.                         bits_ac_luminance,

  269.                         val_ac_luminance);

  270.     build_huffman_codes(m->huff_size_ac_chrominance,

  271.                         m->huff_code_ac_chrominance,

  272.                         bits_ac_chrominance,

  273.                         val_ac_chrominance);

  274.     

  275.     s->mjpeg_ctx = m;

  276.     return 0;

  277. }

  278. 

  279. void mjpeg_close(MpegEncContext *s)

  280. {

  281.     av_free(s->mjpeg_ctx);

  282. }

  283. 

  284. #define PREDICT(ret, topleft, top, left, predictor)\

  285.     switch(predictor){\

  286.         case 1: ret= left; break;\

  287.         case 2: ret= top; break;\

  288.         case 3: ret= topleft; break;\

  289.         case 4: ret= left   +   top - topleft; break;\

  290.         case 5: ret= left   + ((top - topleft)>>1); break;\

  291.         case 6: ret= top + ((left   - topleft)>>1); break;\

  292.         case 7: ret= (left + top)>>1; break;\

  293.     }

  294. 

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

  296. {

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

  298.     put_bits(p, 8, code);

  299. }

  300. 

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

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

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

  304. {

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

  306.     int n, i;

  307. 

  308.     put_bits(p, 4, table_class);

  309.     put_bits(p, 4, table_id);

  310. 

  311.     n = 0;

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

  313.         n += bits_table[i];

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

  315.     }

  316. 

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

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

  319. 

  320.     return n + 17;

  321. }

  322. 

  323. static void jpeg_table_header(MpegEncContext *s)

  324. {

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

  326.     int i, j, size;

  327.     uint8_t *ptr;

  328. 

  329.     /* quant matrixes */

  330.     put_marker(p, DQT);

  331. #ifdef TWOMATRIXES

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

  333. #else

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

  335. #endif

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

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

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

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

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

  341.     }

  342. #ifdef TWOMATRIXES

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

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

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

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

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

  348.     }

  349. #endif

  350. 

  351.     /* huffman table */

  352.     put_marker(p, DHT);

  353.     flush_put_bits(p);

  354.     ptr = pbBufPtr(p);

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

  356.     size = 2;

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

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

  359.     

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

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

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

  363.     ptr[1] = size;

  364. }

  365. 

  366. static void jpeg_put_comments(MpegEncContext *s)

  367. {

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

  369.     int size;

  370.     uint8_t *ptr;

  371. 

  372.     if (s->aspect_ratio_info)

  373.     {

  374.     /* JFIF header */

  375.     put_marker(p, APP0);

  376.     put_bits(p, 16, 16);

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

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

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

  380.     switch(s->aspect_ratio_info)

  381.     {

  382. 	case FF_ASPECT_4_3_625:

  383. 	case FF_ASPECT_4_3_525:

  384. 	    put_bits(p, 16, 4); 

  385. 	    put_bits(p, 16, 3);

  386. 	    break;

  387. 	case FF_ASPECT_16_9_625:

  388. 	case FF_ASPECT_16_9_525:

  389. 	    put_bits(p, 16, 16); 

  390. 	    put_bits(p, 16, 9);

  391. 	    break;

  392. 	case FF_ASPECT_EXTENDED:

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

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

  395. 	    break;

  396. 	case FF_ASPECT_SQUARE:

  397. 	default:

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

  399. 	    put_bits(p, 16, 1);

  400. 	    break;

  401.     }

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

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

  404.     }

  405. 

  406.     /* comment */

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

  408.         put_marker(p, COM);

  409.         flush_put_bits(p);

  410.         ptr = pbBufPtr(p);

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

  412.         put_string(p, LIBAVCODEC_IDENT);

  413.         size = strlen(LIBAVCODEC_IDENT)+3;

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

  415.         ptr[1] = size;

  416.     }

  417. }

  418. 

  419. void mjpeg_picture_header(MpegEncContext *s)

  420. {

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

  422. 

  423.     if (!s->mjpeg_data_only_frames)

  424.     {

  425.     jpeg_put_comments(s);    

  426. 

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

  428. 

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

  430. 

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

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

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

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

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

  436.     

  437.     /* Y component */

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

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

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

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

  442.     

  443.     /* Cb component */

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

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

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

  447. #ifdef TWOMATRIXES

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

  449. #else

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

  451. #endif

  452. 

  453.     /* Cr component */

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

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

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

  457. #ifdef TWOMATRIXES

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

  459. #else

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

  461. #endif

  462.     }

  463. 

  464.     /* scan header */

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

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

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

  468.     

  469.     /* Y component */

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

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

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

  473.     

  474.     /* Cb component */

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

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

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

  478.     

  479.     /* Cr component */

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

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

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

  483. 

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

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

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

  487. }

  488. 

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

  490. {

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

  492.     int i, ff_count;

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

  494.     int align= (-(size_t)(buf))&3;

  495.     

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

  497.     size >>= 3;

  498.     

  499.     ff_count=0;

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

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

  502.     }

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

  504.         int acc, v;

  505. 

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

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

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

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

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

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

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

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

  514. 

  515.         acc>>=4;

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

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

  518.         ff_count+= acc&0xFF;

  519.     }

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

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

  522.     }

  523. 

  524.     if(ff_count==0) return;

  525.     

  526.     /* skip put bits */

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

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

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

  530.     flush_put_bits(&s->pb); 

  531. 

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

  533.         int v= buf[i];

  534. 

  535.         if(v==0xFF){

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

  537.             buf[i+ff_count]= 0;

  538.             ff_count--;

  539.         }

  540. 

  541.         buf[i+ff_count]= v;

  542.     }

  543. }

  544. 

  545. void mjpeg_picture_trailer(MpegEncContext *s)

  546. {

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

  548.     

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

  550.     flush_put_bits(&s->pb);

  551. 

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

  553.     

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

  555. 

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

  557. }

  558. 

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

  560. 				   uint8_t *huff_size, uint16_t *huff_code)

  561. {

  562.     int mant, nbits;

  563. 

  564.     if (val == 0) {

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

  566.     } else {

  567.         mant = val;

  568.         if (val < 0) {

  569.             val = -val;

  570.             mant--;

  571.         }

  572.         

  573.         nbits= av_log2(val) + 1;

  574.             

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

  576.         

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

  578.     }

  579. }

  580. 

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

  582. {

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

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

  585.     MJpegContext *m = s->mjpeg_ctx;

  586.     uint8_t *huff_size_ac;

  587.     uint16_t *huff_code_ac;

  588.     

  589.     /* DC coef */

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

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

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

  593.     if (n < 4) {

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

  595.         huff_size_ac = m->huff_size_ac_luminance;

  596.         huff_code_ac = m->huff_code_ac_luminance;

  597.     } else {

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

  599.         huff_size_ac = m->huff_size_ac_chrominance;

  600.         huff_code_ac = m->huff_code_ac_chrominance;

  601.     }

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

  603.     

  604.     /* AC coefs */

  605.     

  606.     run = 0;

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

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

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

  610.         val = block[j];

  611.         if (val == 0) {

  612.             run++;

  613.         } else {

  614.             while (run >= 16) {

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

  616.                 run -= 16;

  617.             }

  618.             mant = val;

  619.             if (val < 0) {

  620.                 val = -val;

  621.                 mant--;

  622.             }

  623.             

  624.             nbits= av_log2(val) + 1;

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

  626. 

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

  628.         

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

  630.             run = 0;

  631.         }

  632.     }

  633. 

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

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

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

  637. }

  638. 

  639. void mjpeg_encode_mb(MpegEncContext *s, 

  640.                      DCTELEM block[6][64])

  641. {

  642.     int i;

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

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

  645.     }

  646. }

  647. 

  648. /******************************************/

  649. /* decoding */

  650. 

  651. #define MAX_COMPONENTS 4

  652. 

  653. typedef struct MJpegDecodeContext {

  654.     AVCodecContext *avctx;

  655.     GetBitContext gb;

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

  657. 

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

  659.     int buffer_size;

  660.     uint8_t *buffer;

  661. 

  662.     int16_t quant_matrixes[4][64];

  663.     VLC vlcs[2][4];

  664. 

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

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

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

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

  669.     int lossless;

  670.     int rgb;

  671.     int rct;    /* pegasus reversible colorspace transform */  

  672.     int bits;           /* bits per component */

  673. 

  674.     int width, height;

  675.     int nb_components;

  676.     int component_id[MAX_COMPONENTS];

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

  678.     int v_count[MAX_COMPONENTS];

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

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

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

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

  683.     int linesize[MAX_COMPONENTS];

  684.     DCTELEM block[64] __align8;

  685.     ScanTable scantable;

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

  687. 

  688.     int restart_interval;

  689.     int restart_count;

  690. 

  691.     int buggy_avid;

  692.     int interlace_polarity;

  693. } MJpegDecodeContext;

  694. 

  695. static int mjpeg_decode_dht(MJpegDecodeContext *s);

  696. 

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

  698.                       int nb_codes)

  699. {

  700.     uint8_t huff_size[256];

  701.     uint16_t huff_code[256];

  702. 

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

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

  705.     

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

  707. }

  708. 

  709. static int mjpeg_decode_init(AVCodecContext *avctx)

  710. {

  711.     MJpegDecodeContext *s = avctx->priv_data;

  712.     MpegEncContext s2;

  713. 

  714.     s->avctx = avctx;

  715. 

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

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

  718.     s2.flags= avctx->flags;

  719.     s2.avctx= avctx;

  720. //    s2->out_format = FMT_MJPEG;

  721.     s2.width = 8;

  722.     s2.height = 8;

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

  724.        return -1;

  725.     s->scantable= s2.intra_scantable;

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

  727.     MPV_common_end(&s2);

  728. 

  729.     s->mpeg_enc_ctx_allocated = 0;

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

  731. 				but photojpg files could ahive bigger sizes */

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

  733.     if (!s->buffer)

  734. 	return -1;

  735.     s->start_code = -1;

  736.     s->first_picture = 1;

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

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

  739.     

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

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

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

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

  744. 

  745.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  746.     {

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

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

  749. 	mjpeg_decode_dht(s);

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

  751.     }

  752. 

  753.     return 0;

  754. }

  755. 

  756. /* quantize tables */

  757. static int mjpeg_decode_dqt(MJpegDecodeContext *s)

  758. {

  759.     int len, index, i, j;

  760.     

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

  762. 

  763.     while (len >= 65) {

  764.         /* only 8 bit precision handled */

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

  766. 	{

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

  768.             return -1;

  769. 	}

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

  771.         if (index >= 4)

  772.             return -1;

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

  774.         /* read quant table */

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

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

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

  778.         }

  779.         len -= 65;

  780.     }

  781.     

  782.     return 0;

  783. }

  784. 

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

  786. static int mjpeg_decode_dht(MJpegDecodeContext *s)

  787. {

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

  789.     uint8_t bits_table[17];

  790.     uint8_t val_table[256];

  791.     

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

  793. 

  794.     while (len > 0) {

  795.         if (len < 17)

  796.             return -1;

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

  798.         if (class >= 2)

  799.             return -1;

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

  801.         if (index >= 4)

  802.             return -1;

  803.         n = 0;

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

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

  806.             n += bits_table[i];

  807.         }

  808.         len -= 17;

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

  810.             return -1;

  811. 

  812.         code_max = 0;

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

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

  815.             if (v > code_max)

  816.                 code_max = v;

  817.             val_table[i] = v;

  818.         }

  819.         len -= n;

  820. 

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

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

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

  824.                class, index, code_max + 1);

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

  826.     }

  827.     return 0;

  828. }

  829. 

  830. static int mjpeg_decode_sof(MJpegDecodeContext *s)

  831. {

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

  833. 

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

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

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

  837.     if(s->rct) s->bits=9;

  838. 

  839.     if (s->bits != 8 && !s->lossless){

  840.         printf("only 8 bits/component accepted\n");

  841.         return -1;

  842.     }

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

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

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

  846. 

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

  848.     if (nb_components <= 0 ||

  849.         nb_components > MAX_COMPONENTS)

  850.         return -1;

  851.     s->nb_components = nb_components;

  852.     s->h_max = 1;

  853.     s->v_max = 1;

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

  855.         /* component id */

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

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

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

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

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

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

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

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

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

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

  866.             return -1;

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

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

  869.     }

  870.     

  871.     if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;

  872. 

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

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

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

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

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

  878.         s->width = width;

  879.         s->height = height;

  880.         /* test interlaced mode */

  881.         if (s->first_picture &&

  882.             s->org_height != 0 &&

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

  884.             s->interlaced = 1;

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

  886. 	    s->bottom_field = 0;

  887.         }

  888. 

  889.         if(s->rgb){

  890.             int w, h;

  891.             w = s->width;

  892.             h = s->height;

  893.             if (s->interlaced)

  894.                 w *= 2;

  895.             s->linesize[0] = 4*w;

  896.             s->current_picture[0] = av_mallocz(4*w * h);

  897.             s->current_picture[1] = s->current_picture[2] = NULL;

  898.         }else{

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

  900.             int w, h;

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

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

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

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

  905.             if (s->interlaced)

  906.                 w *= 2;

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

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

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

  910. 	    {

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

  912. 		return -1;

  913. 	    }

  914.           }

  915.         }

  916.         s->first_picture = 0;

  917.     }

  918. 

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

  920.     {

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

  922.     }

  923.     

  924.     return 0;

  925. }

  926. 

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

  928. {

  929.     int code;

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

  931.     if (code < 0)

  932.     {

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

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

  935.         return 0xffff;

  936.     }

  937. 

  938.     if(code)

  939.         return get_xbits(&s->gb, code);

  940.     else

  941.         return 0;

  942. }

  943. 

  944. /* decode block and dequantize */

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

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

  947. {

  948.     int code, i, j, level, val;

  949.     VLC *ac_vlc;

  950.     int16_t *quant_matrix;

  951. 

  952.     /* DC coef */

  953.     val = mjpeg_decode_dc(s, dc_index);

  954.     if (val == 0xffff) {

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

  956.         return -1;

  957.     }

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

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

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

  961.     block[0] = val;

  962.     /* AC coefs */

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

  964.     i = 1;

  965.     for(;;) {

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

  967. 

  968.         if (code < 0) {

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

  970.             return -1;

  971.         }

  972.         /* EOB */

  973.         if (code == 0)

  974.             break;

  975.         if (code == 0xf0) {

  976.             i += 16;

  977.         } else {

  978.             level = get_xbits(&s->gb, code & 0xf);

  979.             i += code >> 4;

  980.             if (i >= 64) {

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

  982.                 return -1;

  983.             }

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

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

  986.             i++;

  987.             if (i >= 64)

  988.                 break;

  989.         }

  990.     }

  991.     return 0;

  992. }

  993. 

  994. static void decode_lossless(MJpegDecodeContext *s, int point_transform, int predictor){

  995. }

  996. 

  997. static int mjpeg_decode_sos(MJpegDecodeContext *s)

  998. {

  999.     int len, nb_components, i, j, n, h, v, ret, point_transform, predictor;

  1000.     int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id;

  1001.     int comp_index[4];

  1002.     int dc_index[4];

  1003.     int ac_index[4];

  1004.     int nb_blocks[4];

  1005.     int h_count[4];

  1006.     int v_count[4];

  1007.     const int block_size= s->lossless ? 1 : 8;

  1008. 

  1009.     /* XXX: verify len field validity */

  1010.     len = get_bits(&s->gb, 16);

  1011.     nb_components = get_bits(&s->gb, 8);

  1012.     if (len != 6+2*nb_components)

  1013.     {

  1014. 	dprintf("decode_sos: invalid len (%d)\n", len);

  1015. 	return -1;

  1016.     }

  1017.     /* XXX: only interleaved scan accepted */

  1018.     if (nb_components != 3)

  1019.     {

  1020. 	dprintf("decode_sos: components(%d) mismatch\n", nb_components);

  1021.         return -1;

  1022.     }

  1023.     vmax = 0;

  1024.     hmax = 0;

  1025.     for(i=0;i<nb_components;i++) {

  1026.         id = get_bits(&s->gb, 8) - 1;

  1027. 	dprintf("component: %d\n", id);

  1028.         /* find component index */

  1029.         for(index=0;index<s->nb_components;index++)

  1030.             if (id == s->component_id[index])

  1031.                 break;

  1032.         if (index == s->nb_components)

  1033. 	{

  1034. 	    dprintf("decode_sos: index(%d) out of components\n", index);

  1035.             return -1;

  1036. 	}

  1037. 

  1038.         comp_index[i] = index;

  1039. 

  1040.         nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1041.         h_count[i] = s->h_count[index];

  1042.         v_count[i] = s->v_count[index];

  1043. 

  1044.         dc_index[i] = get_bits(&s->gb, 4);

  1045.         ac_index[i] = get_bits(&s->gb, 4);

  1046. 

  1047. 	if (dc_index[i] < 0 || ac_index[i] < 0 ||

  1048. 	    dc_index[i] >= 4 || ac_index[i] >= 4)

  1049. 	    goto out_of_range;

  1050. 	switch(s->start_code)

  1051. 	{

  1052. 	    case SOF0:

  1053. 		if (dc_index[i] > 1 || ac_index[i] > 1)

  1054. 		    goto out_of_range;

  1055. 		break;

  1056. 	    case SOF1:

  1057. 	    case SOF2:

  1058. 		if (dc_index[i] > 3 || ac_index[i] > 3)

  1059. 		    goto out_of_range;

  1060. 		break;

  1061. 	    case SOF3:

  1062. 		if (dc_index[i] > 3 || ac_index[i] != 0)

  1063. 		    goto out_of_range;

  1064. 		break;	

  1065. 	}

  1066.     }

  1067. 

  1068.     predictor= get_bits(&s->gb, 8); /* lossless predictor or start of spectral (Ss) */

  1069.     skip_bits(&s->gb, 8); /* Se */

  1070.     skip_bits(&s->gb, 4); /* Ah */

  1071.     point_transform= get_bits(&s->gb, 4); /* Al */

  1072. 

  1073.     for(i=0;i<nb_components;i++) 

  1074.         s->last_dc[i] = 1024;

  1075. 

  1076.     if (nb_components > 1) {

  1077.         /* interleaved stream */

  1078.         mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);

  1079.         mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);

  1080.     } else {

  1081.         h = s->h_max / s->h_count[comp_index[0]];

  1082.         v = s->v_max / s->v_count[comp_index[0]];

  1083.         mb_width  = (s->width  + h * block_size - 1) / (h * block_size);

  1084.         mb_height = (s->height + v * block_size - 1) / (v * block_size);

  1085.         nb_blocks[0] = 1;

  1086.         h_count[0] = 1;

  1087.         v_count[0] = 1;

  1088.     }

  1089. 

  1090.     if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1091.         printf("%s %s p:%d >>:%d\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "", predictor, point_transform);

  1092.     

  1093.     if(s->lossless){

  1094.         if(s->rgb){

  1095.             uint16_t buffer[2048][4];

  1096.             int left[3], top[3], topleft[3];

  1097.             const int linesize= s->linesize[0];

  1098.             const int mask= (1<<s->bits)-1;

  1099.             

  1100.             for(i=0; i<3; i++){

  1101.                 buffer[0][i]= 1 << (s->bits + point_transform - 1);

  1102.             }

  1103.             for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1104.                 const int modified_predictor= mb_y ? 1 : predictor;

  1105.                 uint8_t *ptr = s->current_picture[0] + (linesize * mb_y);

  1106. 

  1107.                 if (s->interlaced && s->bottom_field)

  1108.                     ptr += linesize >> 1;

  1109. 

  1110.                 for(i=0; i<3; i++){

  1111.                     top[i]= left[i]= topleft[i]= buffer[0][i];

  1112.                 }

  1113.                 for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1114.                     if (s->restart_interval && !s->restart_count)

  1115.                         s->restart_count = s->restart_interval;

  1116. 

  1117.                     for(i=0;i<3;i++) {

  1118.                         int pred;

  1119. 

  1120.                         PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);

  1121.                             

  1122.                         topleft[i]= top[i];

  1123.                         top[i]= buffer[mb_x][i];

  1124.                         

  1125.                         left[i]= 

  1126.                         buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform));

  1127.                     }

  1128. 

  1129.                     if (s->restart_interval && !--s->restart_count) {

  1130.                         align_get_bits(&s->gb);

  1131.                         skip_bits(&s->gb, 16); /* skip RSTn */

  1132.                     }

  1133.                 }

  1134. 

  1135.                 if(s->rct){

  1136.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1137.                         ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);

  1138.                         ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];

  1139.                         ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];

  1140.                     }

  1141.                 }else{

  1142.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1143.                         ptr[4*mb_x+0] = buffer[mb_x][0];

  1144.                         ptr[4*mb_x+1] = buffer[mb_x][1];

  1145.                         ptr[4*mb_x+2] = buffer[mb_x][2];

  1146.                     }

  1147.                 }

  1148.             }

  1149.         }else{

  1150.             for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1151.                 for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1152.                     if (s->restart_interval && !s->restart_count)

  1153.                         s->restart_count = s->restart_interval;

  1154. 

  1155.                     if(mb_x==0 || mb_y==0 || s->interlaced){

  1156.                         for(i=0;i<nb_components;i++) {

  1157.                             uint8_t *ptr;

  1158.                             int x, y, c, linesize;

  1159.                             n = nb_blocks[i];

  1160.                             c = comp_index[i];

  1161.                             h = h_count[i];

  1162.                             v = v_count[i];

  1163.                             x = 0;

  1164.                             y = 0;

  1165.                             linesize= s->linesize[c];

  1166.                             

  1167.                             for(j=0; j<n; j++) {

  1168.                                 int pred;

  1169. 

  1170.                                 ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1171.                                 if(y==0 && mb_y==0){

  1172.                                     if(x==0 && mb_x==0){

  1173.                                         pred= 128 << point_transform;

  1174.                                     }else{

  1175.                                         pred= ptr[-1];

  1176.                                     }

  1177.                                 }else{

  1178.                                     if(x==0 && mb_x==0){

  1179.                                         pred= ptr[-linesize];

  1180.                                     }else{

  1181.                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1182.                                     }

  1183.                                 }

  1184.                                 

  1185.                                 if (s->interlaced && s->bottom_field)

  1186.                                     ptr += linesize >> 1;

  1187.                                 *ptr= pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform);

  1188. 

  1189.                                 if (++x == h) {

  1190.                                     x = 0;

  1191.                                     y++;

  1192.                                 }

  1193.                             }

  1194.                         }

  1195.                     }else{

  1196.                         for(i=0;i<nb_components;i++) {

  1197.                             uint8_t *ptr;

  1198.                             int x, y, c, linesize;

  1199.                             n = nb_blocks[i];

  1200.                             c = comp_index[i];

  1201.                             h = h_count[i];

  1202.                             v = v_count[i];

  1203.                             x = 0;

  1204.                             y = 0;

  1205.                             linesize= s->linesize[c];

  1206.                             

  1207.                             for(j=0; j<n; j++) {

  1208.                                 int pred;

  1209. 

  1210.                                 ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1211.                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1212.                                 *ptr= pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform);

  1213.                                 if (++x == h) {

  1214.                                     x = 0;

  1215.                                     y++;

  1216.                                 }

  1217.                             }

  1218.                         }

  1219.                     }

  1220.                     if (s->restart_interval && !--s->restart_count) {

  1221.                         align_get_bits(&s->gb);

  1222.                         skip_bits(&s->gb, 16); /* skip RSTn */

  1223.                     }

  1224.                 }

  1225.             }

  1226.         }

  1227.     }else{

  1228.       for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1229.         for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1230.             if (s->restart_interval && !s->restart_count)

  1231.                 s->restart_count = s->restart_interval;

  1232. 

  1233.             for(i=0;i<nb_components;i++) {

  1234.                 uint8_t *ptr;

  1235.                 int x, y, c;

  1236.                 n = nb_blocks[i];

  1237.                 c = comp_index[i];

  1238.                 h = h_count[i];

  1239.                 v = v_count[i];

  1240.                 x = 0;

  1241.                 y = 0;

  1242.                 for(j=0;j<n;j++) {

  1243.                     memset(s->block, 0, sizeof(s->block));

  1244.                     if (decode_block(s, s->block, i, 

  1245.                                      dc_index[i], ac_index[i], 

  1246.                                      s->quant_index[c]) < 0) {

  1247.                         dprintf("error y=%d x=%d\n", mb_y, mb_x);

  1248.                         ret = -1;

  1249.                         goto the_end;

  1250.                     }

  1251. //		    dprintf("mb: %d %d processed\n", mb_y, mb_x);

  1252.                     ptr = s->current_picture[c] + 

  1253.                         (s->linesize[c] * (v * mb_y + y) * 8) + 

  1254.                         (h * mb_x + x) * 8;

  1255.                     if (s->interlaced && s->bottom_field)

  1256.                         ptr += s->linesize[c] >> 1;

  1257.                     s->idct_put(ptr, s->linesize[c], s->block);

  1258.                     if (++x == h) {

  1259.                         x = 0;

  1260.                         y++;

  1261.                     }

  1262.                 }

  1263.             }

  1264. 	    /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

  1265.             if (s->restart_interval && (s->restart_interval < 1350) &&

  1266. 		!--s->restart_count) {

  1267.                 align_get_bits(&s->gb);

  1268.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1269.                 for (j=0; j<nb_components; j++) /* reset dc */

  1270.                     s->last_dc[j] = 1024;

  1271.             }

  1272.         }

  1273.     }

  1274.   }

  1275.     ret = 0;

  1276.  the_end:

  1277.     emms_c();

  1278.     return ret;

  1279.  out_of_range:

  1280.     dprintf("decode_sos: ac/dc index out of range\n");

  1281.     return -1;

  1282. }

  1283. 

  1284. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1285. {

  1286.     if (get_bits(&s->gb, 16) != 4)

  1287. 	return -1;

  1288.     s->restart_interval = get_bits(&s->gb, 16);

  1289.     dprintf("restart interval: %d\n", s->restart_interval);

  1290. 

  1291.     return 0;

  1292. }

  1293. 

  1294. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1295. {

  1296.     int len, id;

  1297. 

  1298.     /* XXX: verify len field validity */

  1299.     len = get_bits(&s->gb, 16);

  1300.     if (len < 5)

  1301. 	return -1;

  1302. 

  1303.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1304.     id = be2me_32(id);

  1305.     len -= 6;

  1306. 

  1307.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1308.         printf("APPx %8X\n", id); 

  1309.     }

  1310.     

  1311.     /* buggy AVID, it puts EOI only at every 10th frame */

  1312.     /* also this fourcc is used by non-avid files too, it holds some

  1313.        informations, but it's always present in AVID creates files */

  1314.     if (id == ff_get_fourcc("AVI1"))

  1315.     {

  1316. 	/* structure:

  1317. 	    4bytes	AVI1

  1318. 	    1bytes	polarity

  1319. 	    1bytes	always zero

  1320. 	    4bytes	field_size

  1321. 	    4bytes	field_size_less_padding

  1322. 	*/

  1323.     	s->buggy_avid = 1;

  1324. //	if (s->first_picture)

  1325. //	    printf("mjpeg: workarounding buggy AVID\n");

  1326. 	s->interlace_polarity = get_bits(&s->gb, 8);

  1327. #if 0

  1328. 	skip_bits(&s->gb, 8);

  1329. 	skip_bits(&s->gb, 32);

  1330. 	skip_bits(&s->gb, 32);

  1331. 	len -= 10;

  1332. #endif

  1333. //	if (s->interlace_polarity)

  1334. //	    printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1335. 	goto out;

  1336.     }

  1337.     

  1338. //    len -= 2;

  1339.     

  1340.     if (id == ff_get_fourcc("JFIF"))

  1341.     {

  1342. 	int t_w, t_h;

  1343. 	skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1344. 	printf("mjpeg: JFIF header found (version: %x.%x)\n",

  1345. 	    get_bits(&s->gb, 8), get_bits(&s->gb, 8));

  1346. 	if (get_bits(&s->gb, 8) == 0)

  1347. 	{

  1348. 	    int x_density, y_density; 

  1349. 	    x_density = get_bits(&s->gb, 16);

  1350. 	    y_density = get_bits(&s->gb, 16);

  1351. 

  1352. 	    dprintf("x/y density: %d (%f), %d (%f)\n", x_density,

  1353. 		(float)x_density, y_density, (float)y_density);

  1354. #if 0

  1355.             //MN: needs to be checked

  1356.             if(x_density)

  1357. //                s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);

  1358. 		s->avctx->aspect_ratio = (float)x_density/y_density;

  1359. 		/* it's better, but every JFIF I have seen stores 1:1 */

  1360.             else

  1361.                 s->avctx->aspect_ratio= 0.0;

  1362. #endif

  1363. 	}

  1364. 	else

  1365. 	{

  1366. 	    skip_bits(&s->gb, 16);

  1367. 	    skip_bits(&s->gb, 16);

  1368. 	}

  1369. 

  1370. 	t_w = get_bits(&s->gb, 8);

  1371. 	t_h = get_bits(&s->gb, 8);

  1372. 	if (t_w && t_h)

  1373. 	{

  1374. 	    /* skip thumbnail */

  1375. 	    if (len-10-(t_w*t_h*3) > 0)

  1376. 		len -= t_w*t_h*3;

  1377. 	}

  1378. 	len -= 10;

  1379. 	goto out;

  1380.     }

  1381.     

  1382.     if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1383.     {

  1384. 	printf("mjpeg: Adobe header found\n");

  1385. 	skip_bits(&s->gb, 16); /* version */

  1386. 	skip_bits(&s->gb, 16); /* flags0 */

  1387. 	skip_bits(&s->gb, 16); /* flags1 */

  1388. 	skip_bits(&s->gb, 8); /* transform */

  1389. 	len -= 7;

  1390. 	goto out;

  1391.     }

  1392. 

  1393.     if (id == ff_get_fourcc("LJIF")){

  1394.         printf("Pegasus lossless jpeg header found\n");

  1395.         int i;

  1396. 	skip_bits(&s->gb, 16); /* version ? */

  1397. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1398. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1399. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1400.         switch( get_bits(&s->gb, 8)){

  1401.         case 1:

  1402.             s->rgb= 1;

  1403.             s->rct=0;

  1404.             break;

  1405.         case 2:

  1406.             s->rgb= 1;

  1407.             s->rct=1;

  1408.             break;

  1409.         default:

  1410.             printf("unknown colorspace\n");

  1411.         }

  1412.         len -= 9;

  1413.         goto out;

  1414.     }

  1415.     

  1416.     /* Apple MJPEG-A */

  1417.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1418.     {

  1419. 	id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1420. 	id = be2me_32(id);

  1421. 	len -= 4;

  1422. 	if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */

  1423. 	{

  1424. #if 0

  1425. 	    skip_bits(&s->gb, 32); /* field size */

  1426. 	    skip_bits(&s->gb, 32); /* pad field size */

  1427. 	    skip_bits(&s->gb, 32); /* next off */

  1428. 	    skip_bits(&s->gb, 32); /* quant off */

  1429. 	    skip_bits(&s->gb, 32); /* huff off */

  1430. 	    skip_bits(&s->gb, 32); /* image off */

  1431. 	    skip_bits(&s->gb, 32); /* scan off */

  1432. 	    skip_bits(&s->gb, 32); /* data off */

  1433. #endif

  1434. 	    if (s->first_picture)

  1435. 		printf("mjpeg: Apple MJPEG-A header found\n");

  1436. 	}

  1437.     }

  1438. 

  1439. out:

  1440.     /* slow but needed for extreme adobe jpegs */

  1441.     if (len < 0)

  1442. 	printf("mjpeg: error, decode_app parser read over the end\n");

  1443.     while(--len > 0)

  1444. 	skip_bits(&s->gb, 8);

  1445. 

  1446.     return 0;

  1447. }

  1448. 

  1449. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1450. {

  1451.     /* XXX: verify len field validity */

  1452.     unsigned int len = get_bits(&s->gb, 16);

  1453.     if (len >= 2 && len < 32768) {

  1454. 	/* XXX: any better upper bound */

  1455. 	uint8_t *cbuf = av_malloc(len - 1);

  1456. 	if (cbuf) {

  1457. 	    int i;

  1458. 	    for (i = 0; i < len - 2; i++)

  1459. 		cbuf[i] = get_bits(&s->gb, 8);

  1460. 	    if (i > 0 && cbuf[i-1] == '\n')

  1461. 		cbuf[i-1] = 0;

  1462. 	    else

  1463. 		cbuf[i] = 0;

  1464. 

  1465. 	    printf("mjpeg comment: '%s'\n", cbuf);

  1466. 

  1467. 	    /* buggy avid, it puts EOI only at every 10th frame */

  1468. 	    if (!strcmp(cbuf, "AVID"))

  1469. 	    {

  1470. 		s->buggy_avid = 1;

  1471. 		//	if (s->first_picture)

  1472. 		//	    printf("mjpeg: workarounding buggy AVID\n");

  1473. 	    }

  1474. 

  1475. 	    av_free(cbuf);

  1476. 	}

  1477.     }

  1478. 

  1479.     return 0;

  1480. }

  1481. 

  1482. #if 0

  1483. static int valid_marker_list[] =

  1484. {

  1485.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1486. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1487. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1488. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1489. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1490. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1491. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1492. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1493. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1494. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1495. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1496. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1497. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1498. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1499. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1500. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1501. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1502. }

  1503. #endif

  1504. 

  1505. /* return the 8 bit start code value and update the search

  1506.    state. Return -1 if no start code found */

  1507. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1508. {

  1509.     uint8_t *buf_ptr;

  1510.     unsigned int v, v2;

  1511.     int val;

  1512. #ifdef DEBUG

  1513.     int skipped=0;

  1514. #endif

  1515. 

  1516.     buf_ptr = *pbuf_ptr;

  1517.     while (buf_ptr < buf_end) {

  1518.         v = *buf_ptr++;

  1519. 	v2 = *buf_ptr;

  1520.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {

  1521. 	    val = *buf_ptr++;

  1522. 	    goto found;

  1523.         }

  1524. #ifdef DEBUG

  1525. 	skipped++;

  1526. #endif

  1527.     }

  1528.     val = -1;

  1529. found:

  1530. #ifdef DEBUG

  1531.     dprintf("find_marker skipped %d bytes\n", skipped);

  1532. #endif

  1533.     *pbuf_ptr = buf_ptr;

  1534.     return val;

  1535. }

  1536. 

  1537. static int mjpeg_decode_frame(AVCodecContext *avctx, 

  1538.                               void *data, int *data_size,

  1539.                               uint8_t *buf, int buf_size)

  1540. {

  1541.     MJpegDecodeContext *s = avctx->priv_data;

  1542.     uint8_t *buf_end, *buf_ptr;

  1543.     int i, start_code;

  1544.     AVPicture *picture = data;

  1545. 

  1546.     *data_size = 0;

  1547. 

  1548.     /* no supplementary picture */

  1549.     if (buf_size == 0)

  1550.         return 0;

  1551. 

  1552.     buf_ptr = buf;

  1553.     buf_end = buf + buf_size;

  1554.     while (buf_ptr < buf_end) {

  1555.         /* find start next marker */

  1556.         start_code = find_marker(&buf_ptr, buf_end);

  1557. 	{

  1558. 	    /* EOF */

  1559.             if (start_code < 0) {

  1560. 		goto the_end;

  1561.             } else {

  1562.                 dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);

  1563. 		

  1564. 		if ((buf_end - buf_ptr) > s->buffer_size)

  1565. 		{

  1566. 		    av_free(s->buffer);

  1567. 		    s->buffer_size = buf_end-buf_ptr;

  1568. 		    s->buffer = av_malloc(s->buffer_size);

  1569. 		    dprintf("buffer too small, expanding to %d bytes\n",

  1570. 			s->buffer_size);

  1571. 		}

  1572. 		

  1573. 		/* unescape buffer of SOS */

  1574. 		if (start_code == SOS)

  1575. 		{

  1576. 		    uint8_t *src = buf_ptr;

  1577. 		    uint8_t *dst = s->buffer;

  1578. 

  1579. 		    while (src<buf_end)

  1580. 		    {

  1581. 			uint8_t x = *(src++);

  1582. 

  1583. 			*(dst++) = x;

  1584. 			if (x == 0xff)

  1585. 			{

  1586. 			    while(*src == 0xff) src++;

  1587. 

  1588. 			    x = *(src++);

  1589. 			    if (x >= 0xd0 && x <= 0xd7)

  1590. 				*(dst++) = x;

  1591. 			    else if (x)

  1592. 				break;

  1593. 			}

  1594. 		    }

  1595. 		    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1596. 		    

  1597. 		    dprintf("escaping removed %d bytes\n",

  1598. 			(buf_end - buf_ptr) - (dst - s->buffer));

  1599. 		}

  1600. 		else

  1601. 		    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1602. 		

  1603. 		s->start_code = start_code;

  1604.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1605.                     printf("startcode: %X\n", start_code);

  1606.                 }

  1607. 

  1608. 		/* process markers */

  1609. 		if (start_code >= 0xd0 && start_code <= 0xd7) {

  1610. 		    dprintf("restart marker: %d\n", start_code&0x0f);

  1611. 		} else if (s->first_picture) {

  1612. 		    /* APP fields */

  1613. 		    if (start_code >= 0xe0 && start_code <= 0xef)

  1614. 			mjpeg_decode_app(s);

  1615. 		    /* Comment */

  1616. 		    else if (start_code == COM)

  1617. 			mjpeg_decode_com(s);

  1618. 		}

  1619. 

  1620.                 switch(start_code) {

  1621.                 case SOI:

  1622. 		    s->restart_interval = 0;

  1623.                     /* nothing to do on SOI */

  1624.                     break;

  1625.                 case DQT:

  1626.                     mjpeg_decode_dqt(s);

  1627.                     break;

  1628.                 case DHT:

  1629.                     mjpeg_decode_dht(s);

  1630.                     break;

  1631.                 case SOF0:

  1632.                     s->lossless=0;

  1633.                     if (mjpeg_decode_sof(s) < 0) 

  1634. 			return -1;

  1635.                     break;

  1636.                 case SOF3:

  1637.                     s->lossless=1;

  1638.                     if (mjpeg_decode_sof(s) < 0) 

  1639. 			return -1;

  1640.                     break;

  1641. 		case EOI:

  1642. eoi_parser:

  1643. 		    {

  1644.                         if (s->interlaced) {

  1645.                             s->bottom_field ^= 1;

  1646.                             /* if not bottom field, do not output image yet */

  1647.                             if (s->bottom_field)

  1648.                                 goto not_the_end;

  1649.                         }

  1650.                         for(i=0;i<3;i++) {

  1651.                             picture->data[i] = s->current_picture[i];

  1652. 			    picture->linesize[i] = (s->interlaced) ?

  1653. 				s->linesize[i] >> 1 : s->linesize[i];

  1654.                         }

  1655.                         *data_size = sizeof(AVPicture);

  1656.                         avctx->height = s->height;

  1657.                         if (s->interlaced)

  1658.                             avctx->height *= 2;

  1659.                         avctx->width = s->width;

  1660.                         /* XXX: not complete test ! */

  1661.                         switch((s->h_count[0] << 4) | s->v_count[0]) {

  1662.                         case 0x11:

  1663.                             if(s->rgb){

  1664. #ifdef WORDS_BIGENDIAN

  1665.                                 avctx->pix_fmt = PIX_FMT_ABGR32;

  1666. #else                                            

  1667.                                 avctx->pix_fmt = PIX_FMT_RGBA32;

  1668. #endif

  1669.                             }else

  1670.                                 avctx->pix_fmt = PIX_FMT_YUV444P;

  1671.                             break;

  1672.                         case 0x21:

  1673.                             avctx->pix_fmt = PIX_FMT_YUV422P;

  1674.                             break;

  1675.                         default:

  1676.                         case 0x22:

  1677.                             avctx->pix_fmt = PIX_FMT_YUV420P;

  1678.                             break;

  1679.                         }

  1680.                         /* dummy quality */

  1681.                         /* XXX: infer it with matrix */

  1682. //                    	avctx->quality = 3; 

  1683.                         goto the_end;

  1684.                     }

  1685. 		    break;

  1686.                 case SOS:

  1687.                     mjpeg_decode_sos(s);

  1688. 		    /* buggy avid puts EOI every 10-20th frame */

  1689. 		    /* if restart period is over process EOI */

  1690. 		    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1691. 			goto eoi_parser;

  1692.                     break;

  1693. 		case DRI:

  1694. 		    mjpeg_decode_dri(s);

  1695. 		    break;

  1696. 		case SOF1:

  1697. 		case SOF2:

  1698. 		case SOF5:

  1699. 		case SOF6:

  1700. 		case SOF7:

  1701. 		case SOF9:

  1702. 		case SOF10:

  1703. 		case SOF11:

  1704. 		case SOF13:

  1705. 		case SOF14:

  1706. 		case SOF15:

  1707. 		case JPG:

  1708. 		    printf("mjpeg: unsupported coding type (%x)\n", start_code);

  1709. 		    break;

  1710. //		default:

  1711. //		    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1712. //		    break;

  1713.                 }

  1714. 

  1715. not_the_end:

  1716. 		/* eof process start code */

  1717. 		buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1718. 		dprintf("marker parser used %d bytes (%d bits)\n",

  1719. 		    (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1720.             }

  1721.         }

  1722.     }

  1723. the_end:

  1724.     dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);

  1725. //    return buf_end - buf_ptr;

  1726.     return buf_ptr - buf;

  1727. }

  1728. 

  1729. static int mjpegb_decode_frame(AVCodecContext *avctx, 

  1730.                               void *data, int *data_size,

  1731.                               uint8_t *buf, int buf_size)

  1732. {

  1733.     MJpegDecodeContext *s = avctx->priv_data;

  1734.     uint8_t *buf_end, *buf_ptr;

  1735.     int i;

  1736.     AVPicture *picture = data;

  1737.     GetBitContext hgb; /* for the header */

  1738.     uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

  1739.     uint32_t field_size;

  1740. 

  1741.     *data_size = 0;

  1742. 

  1743.     /* no supplementary picture */

  1744.     if (buf_size == 0)

  1745.         return 0;

  1746. 

  1747.     buf_ptr = buf;

  1748.     buf_end = buf + buf_size;

  1749.     

  1750. read_header:

  1751.     /* reset on every SOI */

  1752.     s->restart_interval = 0;

  1753. 

  1754.     init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);

  1755. 

  1756.     skip_bits(&hgb, 32); /* reserved zeros */

  1757.     

  1758.     if (get_bits(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

  1759.     {

  1760. 	dprintf("not mjpeg-b (bad fourcc)\n");

  1761. 	return 0;

  1762.     }

  1763. 

  1764.     field_size = get_bits(&hgb, 32); /* field size */

  1765.     dprintf("field size: 0x%x\n", field_size);

  1766.     skip_bits(&hgb, 32); /* padded field size */

  1767.     second_field_offs = get_bits(&hgb, 32);

  1768.     dprintf("second field offs: 0x%x\n", second_field_offs);

  1769.     if (second_field_offs)

  1770. 	s->interlaced = 1;

  1771. 

  1772.     dqt_offs = get_bits(&hgb, 32);

  1773.     dprintf("dqt offs: 0x%x\n", dqt_offs);

  1774.     if (dqt_offs)

  1775.     {

  1776. 	init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

  1777. 	s->start_code = DQT;

  1778. 	mjpeg_decode_dqt(s);

  1779.     }

  1780.     

  1781.     dht_offs = get_bits(&hgb, 32);

  1782.     dprintf("dht offs: 0x%x\n", dht_offs);

  1783.     if (dht_offs)

  1784.     {

  1785. 	init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

  1786. 	s->start_code = DHT;

  1787. 	mjpeg_decode_dht(s);

  1788.     }

  1789. 

  1790.     sof_offs = get_bits(&hgb, 32);

  1791.     dprintf("sof offs: 0x%x\n", sof_offs);

  1792.     if (sof_offs)

  1793.     {

  1794. 	init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

  1795. 	s->start_code = SOF0;

  1796. 	if (mjpeg_decode_sof(s) < 0)

  1797. 	    return -1;

  1798.     }

  1799. 

  1800.     sos_offs = get_bits(&hgb, 32);

  1801.     dprintf("sos offs: 0x%x\n", sos_offs);

  1802.     if (sos_offs)

  1803.     {

  1804. //	init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);

  1805. 	init_get_bits(&s->gb, buf+sos_offs, field_size*8);

  1806. 	s->start_code = SOS;

  1807. 	mjpeg_decode_sos(s);

  1808.     }

  1809. 

  1810.     skip_bits(&hgb, 32); /* start of data offset */

  1811. 

  1812.     if (s->interlaced) {

  1813.         s->bottom_field ^= 1;

  1814.         /* if not bottom field, do not output image yet */

  1815.         if (s->bottom_field && second_field_offs)

  1816. 	{

  1817. 	    buf_ptr = buf + second_field_offs;

  1818. 	    second_field_offs = 0;

  1819. 	    goto read_header;

  1820.     	}

  1821.     }

  1822. 

  1823.     for(i=0;i<3;i++) {

  1824.         picture->data[i] = s->current_picture[i];

  1825.         picture->linesize[i] = (s->interlaced) ?

  1826.     	    s->linesize[i] >> 1 : s->linesize[i];

  1827.     }

  1828.     *data_size = sizeof(AVPicture);

  1829.     avctx->height = s->height;

  1830.     if (s->interlaced)

  1831.         avctx->height *= 2;

  1832.     avctx->width = s->width;

  1833.     /* XXX: not complete test ! */

  1834.     switch((s->h_count[0] << 4) | s->v_count[0]) {

  1835.         case 0x11:

  1836.     	    avctx->pix_fmt = PIX_FMT_YUV444P;

  1837.             break;

  1838.         case 0x21:

  1839.             avctx->pix_fmt = PIX_FMT_YUV422P;

  1840.             break;

  1841.         default:

  1842. 	case 0x22:

  1843.             avctx->pix_fmt = PIX_FMT_YUV420P;

  1844.             break;

  1845.     }

  1846.     /* dummy quality */

  1847.     /* XXX: infer it with matrix */

  1848. //    avctx->quality = 3; 

  1849. 

  1850.     return buf_ptr - buf;

  1851. }

  1852. 

  1853. 

  1854. static int mjpeg_decode_end(AVCodecContext *avctx)

  1855. {

  1856.     MJpegDecodeContext *s = avctx->priv_data;

  1857.     int i, j;

  1858. 

  1859.     av_free(s->buffer);

  1860.     for(i=0;i<MAX_COMPONENTS;i++)

  1861.         av_free(s->current_picture[i]);

  1862.     for(i=0;i<2;i++) {

  1863.         for(j=0;j<4;j++)

  1864.             free_vlc(&s->vlcs[i][j]);

  1865.     }

  1866.     return 0;

  1867. }

  1868. 

  1869. AVCodec mjpeg_decoder = {

  1870.     "mjpeg",

  1871.     CODEC_TYPE_VIDEO,

  1872.     CODEC_ID_MJPEG,

  1873.     sizeof(MJpegDecodeContext),

  1874.     mjpeg_decode_init,

  1875.     NULL,

  1876.     mjpeg_decode_end,

  1877.     mjpeg_decode_frame,

  1878.     0,

  1879.     NULL

  1880. };

  1881. 

  1882. AVCodec mjpegb_decoder = {

  1883.     "mjpegb",

  1884.     CODEC_TYPE_VIDEO,

  1885.     CODEC_ID_MJPEGB,

  1886.     sizeof(MJpegDecodeContext),

  1887.     mjpeg_decode_init,

  1888.     NULL,

  1889.     mjpeg_decode_end,

  1890.     mjpegb_decode_frame,

  1891.     0,

  1892.     NULL

  1893. };