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.
2202 Commits
32 Branches
293MB
Tree: b1e6b355f7
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'b1e6b355f7'
${ noResults }
FFmpeg/libavcodec/mjpeg.c

2050 lines
62KB
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]; //FIXME use array [3] instead of lumi / chrom, for easier addressing 

  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 /* && !lossless */)

  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.     const int lossless= s->avctx->codec_id == CODEC_ID_LJPEG;

  422. 

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

  424. 

  425.     if (!s->mjpeg_data_only_frames)

  426.     {

  427.     jpeg_put_comments(s);    

  428. 

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

  430. 

  431.     put_marker(&s->pb, lossless ? SOF3 : SOF0);

  432. 

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

  434.     if(lossless && s->avctx->pix_fmt == PIX_FMT_RGBA32)

  435.         put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */

  436.     else

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

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

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

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

  441.     

  442.     /* Y component */

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

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

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

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

  447.     

  448.     /* Cb component */

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

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

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

  452. #ifdef TWOMATRIXES

  453.     put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */

  454. #else

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

  456. #endif

  457. 

  458.     /* Cr component */

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

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

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

  462. #ifdef TWOMATRIXES

  463.     put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */

  464. #else

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

  466. #endif

  467.     }

  468. 

  469.     /* scan header */

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

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

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

  473.     

  474.     /* Y component */

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

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

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

  478.     

  479.     /* Cb component */

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

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

  482.     put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */

  483.     

  484.     /* Cr component */

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

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

  487.     put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */

  488. 

  489.     put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */

  490.     put_bits(&s->pb, 8, lossless ? 0 : 63); /* Se (not used) */

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

  492. }

  493. 

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

  495. {

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

  497.     int i, ff_count;

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

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

  500.     

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

  502.     size >>= 3;

  503.     

  504.     ff_count=0;

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

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

  507.     }

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

  509.         int acc, v;

  510. 

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

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

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

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

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

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

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

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

  519. 

  520.         acc>>=4;

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

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

  523.         ff_count+= acc&0xFF;

  524.     }

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

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

  527.     }

  528. 

  529.     if(ff_count==0) return;

  530.     

  531.     /* skip put bits */

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

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

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

  535.     flush_put_bits(&s->pb); 

  536. 

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

  538.         int v= buf[i];

  539. 

  540.         if(v==0xFF){

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

  542.             buf[i+ff_count]= 0;

  543.             ff_count--;

  544.         }

  545. 

  546.         buf[i+ff_count]= v;

  547.     }

  548. }

  549. 

  550. void mjpeg_picture_trailer(MpegEncContext *s)

  551. {

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

  553.     

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

  555.     flush_put_bits(&s->pb);

  556. 

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

  558.     

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

  560. 

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

  562. }

  563. 

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

  565. 				   uint8_t *huff_size, uint16_t *huff_code)

  566. {

  567.     int mant, nbits;

  568. 

  569.     if (val == 0) {

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

  571.     } else {

  572.         mant = val;

  573.         if (val < 0) {

  574.             val = -val;

  575.             mant--;

  576.         }

  577.         

  578.         nbits= av_log2(val) + 1;

  579.             

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

  581.         

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

  583.     }

  584. }

  585. 

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

  587. {

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

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

  590.     MJpegContext *m = s->mjpeg_ctx;

  591.     uint8_t *huff_size_ac;

  592.     uint16_t *huff_code_ac;

  593.     

  594.     /* DC coef */

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

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

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

  598.     if (n < 4) {

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

  600.         huff_size_ac = m->huff_size_ac_luminance;

  601.         huff_code_ac = m->huff_code_ac_luminance;

  602.     } else {

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

  604.         huff_size_ac = m->huff_size_ac_chrominance;

  605.         huff_code_ac = m->huff_code_ac_chrominance;

  606.     }

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

  608.     

  609.     /* AC coefs */

  610.     

  611.     run = 0;

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

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

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

  615.         val = block[j];

  616.         if (val == 0) {

  617.             run++;

  618.         } else {

  619.             while (run >= 16) {

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

  621.                 run -= 16;

  622.             }

  623.             mant = val;

  624.             if (val < 0) {

  625.                 val = -val;

  626.                 mant--;

  627.             }

  628.             

  629.             nbits= av_log2(val) + 1;

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

  631. 

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

  633.         

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

  635.             run = 0;

  636.         }

  637.     }

  638. 

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

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

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

  642. }

  643. 

  644. void mjpeg_encode_mb(MpegEncContext *s, 

  645.                      DCTELEM block[6][64])

  646. {

  647.     int i;

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

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

  650.     }

  651. }

  652. 

  653. static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  654.     MpegEncContext * const s = avctx->priv_data;

  655.     MJpegContext * const m = s->mjpeg_ctx;

  656.     AVFrame *pict = data;

  657.     const int width= s->width;

  658.     const int height= s->height;

  659.     AVFrame * const p= (AVFrame*)&s->current_picture;

  660.     const int predictor= avctx->prediction_method+1;

  661. 

  662.     init_put_bits(&s->pb, buf, buf_size, NULL, NULL);

  663. 

  664.     *p = *pict;

  665.     p->pict_type= FF_I_TYPE;

  666.     p->key_frame= 1;

  667.     

  668.     mjpeg_picture_header(s);

  669. 

  670.     s->header_bits= get_bit_count(&s->pb);

  671. 

  672.     if(avctx->pix_fmt == PIX_FMT_RGBA32){

  673.         int x, y, i;

  674.         const int linesize= p->linesize[0];

  675.         uint16_t buffer[2048][4];

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

  677. 

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

  679.             buffer[0][i]= 1 << (9 - 1);

  680.         }

  681. 

  682.         for(y = 0; y < height; y++) {

  683.             const int modified_predictor= y ? 1 : predictor;

  684.             uint8_t *ptr = p->data[0] + (linesize * y);

  685. 

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

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

  688.             }

  689.             for(x = 0; x < width; x++) {

  690.                 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;

  691.                 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;

  692.                 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;

  693. 

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

  695.                     int pred, diff;

  696. 

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

  698.                         

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

  700.                     top[i]= buffer[x+1][i];

  701.                     

  702.                     left[i]= buffer[x][i];

  703. 

  704.                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;

  705.                     

  706.                     if(i==0)

  707.                         mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly

  708.                     else

  709.                         mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);

  710.                 }

  711.             }

  712.         }

  713.     }else{

  714.         int mb_x, mb_y, i;

  715.         const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];

  716.         const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];

  717.         

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

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

  720.                 if(mb_x==0 || mb_y==0){

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

  722.                         uint8_t *ptr;

  723.                         int x, y, h, v, linesize;

  724.                         h = s->mjpeg_hsample[i];

  725.                         v = s->mjpeg_vsample[i];

  726.                         linesize= p->linesize[i];

  727. 

  728.                         for(y=0; y<v; y++){

  729.                             for(x=0; x<h; x++){

  730.                                 int pred;

  731. 

  732.                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

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

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

  735.                                         pred= 128;

  736.                                     }else{

  737.                                         pred= ptr[-1];

  738.                                     }

  739.                                 }else{

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

  741.                                         pred= ptr[-linesize];

  742.                                     }else{

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

  744.                                     }

  745.                                 }

  746.                                 

  747.                                 if(i==0)

  748.                                     mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly

  749.                                 else

  750.                                     mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);

  751.                             }

  752.                         }

  753.                     }

  754.                 }else{

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

  756.                         uint8_t *ptr;

  757.                         int x, y, h, v, linesize;

  758.                         h = s->mjpeg_hsample[i];

  759.                         v = s->mjpeg_vsample[i];

  760.                         linesize= p->linesize[i];

  761.                              

  762.                         for(y=0; y<v; y++){

  763.                             for(x=0; x<h; x++){

  764.                                 int pred;

  765. 

  766.                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  767. //printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr); 

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

  769. 

  770.                                 if(i==0)

  771.                                     mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly

  772.                                 else

  773.                                     mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);

  774.                             }

  775.                         }

  776.                     }

  777.                 }

  778.             }

  779.         }

  780.     }

  781. 

  782.     emms_c();

  783.     

  784.     mjpeg_picture_trailer(s);

  785.     s->picture_number++;

  786. 

  787.     flush_put_bits(&s->pb);

  788.     return pbBufPtr(&s->pb) - s->pb.buf;

  789. //    return (get_bit_count(&f->pb)+7)/8;

  790. }

  791. 

  792. 

  793. /******************************************/

  794. /* decoding */

  795. 

  796. #define MAX_COMPONENTS 4

  797. 

  798. typedef struct MJpegDecodeContext {

  799.     AVCodecContext *avctx;

  800.     GetBitContext gb;

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

  802. 

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

  804.     int buffer_size;

  805.     uint8_t *buffer;

  806. 

  807.     int16_t quant_matrixes[4][64];

  808.     VLC vlcs[2][4];

  809. 

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

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

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

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

  814.     int lossless;

  815.     int rgb;

  816.     int rct;            /* standard rct */  

  817.     int pegasus_rct;    /* pegasus reversible colorspace transform */  

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

  819. 

  820.     int width, height;

  821.     int nb_components;

  822.     int component_id[MAX_COMPONENTS];

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

  824.     int v_count[MAX_COMPONENTS];

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

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

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

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

  829.     int linesize[MAX_COMPONENTS];

  830.     DCTELEM block[64] __align8;

  831.     ScanTable scantable;

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

  833. 

  834.     int restart_interval;

  835.     int restart_count;

  836. 

  837.     int buggy_avid;

  838.     int interlace_polarity;

  839. } MJpegDecodeContext;

  840. 

  841. static int mjpeg_decode_dht(MJpegDecodeContext *s);

  842. 

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

  844.                       int nb_codes)

  845. {

  846.     uint8_t huff_size[256];

  847.     uint16_t huff_code[256];

  848. 

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

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

  851.     

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

  853. }

  854. 

  855. static int mjpeg_decode_init(AVCodecContext *avctx)

  856. {

  857.     MJpegDecodeContext *s = avctx->priv_data;

  858.     MpegEncContext s2;

  859. 

  860.     s->avctx = avctx;

  861. 

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

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

  864.     s2.flags= avctx->flags;

  865.     s2.avctx= avctx;

  866. //    s2->out_format = FMT_MJPEG;

  867.     s2.width = 8;

  868.     s2.height = 8;

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

  870.        return -1;

  871.     s->scantable= s2.intra_scantable;

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

  873.     MPV_common_end(&s2);

  874. 

  875.     s->mpeg_enc_ctx_allocated = 0;

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

  877. 				but photojpg files could ahive bigger sizes */

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

  879.     if (!s->buffer)

  880. 	return -1;

  881.     s->start_code = -1;

  882.     s->first_picture = 1;

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

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

  885.     

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

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

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

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

  890. 

  891.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  892.     {

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

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

  895. 	mjpeg_decode_dht(s);

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

  897.     }

  898. 

  899.     return 0;

  900. }

  901. 

  902. /* quantize tables */

  903. static int mjpeg_decode_dqt(MJpegDecodeContext *s)

  904. {

  905.     int len, index, i, j;

  906.     

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

  908. 

  909.     while (len >= 65) {

  910.         /* only 8 bit precision handled */

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

  912. 	{

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

  914.             return -1;

  915. 	}

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

  917.         if (index >= 4)

  918.             return -1;

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

  920.         /* read quant table */

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

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

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

  924.         }

  925.         len -= 65;

  926.     }

  927.     

  928.     return 0;

  929. }

  930. 

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

  932. static int mjpeg_decode_dht(MJpegDecodeContext *s)

  933. {

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

  935.     uint8_t bits_table[17];

  936.     uint8_t val_table[256];

  937.     

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

  939. 

  940.     while (len > 0) {

  941.         if (len < 17)

  942.             return -1;

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

  944.         if (class >= 2)

  945.             return -1;

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

  947.         if (index >= 4)

  948.             return -1;

  949.         n = 0;

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

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

  952.             n += bits_table[i];

  953.         }

  954.         len -= 17;

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

  956.             return -1;

  957. 

  958.         code_max = 0;

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

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

  961.             if (v > code_max)

  962.                 code_max = v;

  963.             val_table[i] = v;

  964.         }

  965.         len -= n;

  966. 

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

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

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

  970.                class, index, code_max + 1);

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

  972.     }

  973.     return 0;

  974. }

  975. 

  976. static int mjpeg_decode_sof(MJpegDecodeContext *s)

  977. {

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

  979. 

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

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

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

  983.     

  984.     if(s->pegasus_rct) s->bits=9;  

  985.     if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly

  986. 

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

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

  989.         return -1;

  990.     }

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

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

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

  994. 

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

  996.     if (nb_components <= 0 ||

  997.         nb_components > MAX_COMPONENTS)

  998.         return -1;

  999.     s->nb_components = nb_components;

  1000.     s->h_max = 1;

  1001.     s->v_max = 1;

  1002.     for(i=0;i<nb_components;i++) {

  1003.         /* component id */

  1004.         s->component_id[i] = get_bits(&s->gb, 8) - 1;

  1005.         s->h_count[i] = get_bits(&s->gb, 4);

  1006.         s->v_count[i] = get_bits(&s->gb, 4);

  1007.         /* compute hmax and vmax (only used in interleaved case) */

  1008.         if (s->h_count[i] > s->h_max)

  1009.             s->h_max = s->h_count[i];

  1010.         if (s->v_count[i] > s->v_max)

  1011.             s->v_max = s->v_count[i];

  1012.         s->quant_index[i] = get_bits(&s->gb, 8);

  1013.         if (s->quant_index[i] >= 4)

  1014.             return -1;

  1015.         dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],

  1016. 	    s->v_count[i], s->component_id[i], s->quant_index[i]);

  1017.     }

  1018.     

  1019.     if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;

  1020. 

  1021.     /* if different size, realloc/alloc picture */

  1022.     /* XXX: also check h_count and v_count */

  1023.     if (width != s->width || height != s->height) {

  1024.         for(i=0;i<MAX_COMPONENTS;i++)

  1025.             av_freep(&s->current_picture[i]);

  1026.         s->width = width;

  1027.         s->height = height;

  1028.         /* test interlaced mode */

  1029.         if (s->first_picture &&

  1030.             s->org_height != 0 &&

  1031.             s->height < ((s->org_height * 3) / 4)) {

  1032.             s->interlaced = 1;

  1033. //	    s->bottom_field = (s->interlace_polarity) ? 1 : 0;

  1034. 	    s->bottom_field = 0;

  1035.         }

  1036. 

  1037.         if(s->rgb){

  1038.             int w, h;

  1039.             w = s->width;

  1040.             h = s->height;

  1041.             if (s->interlaced)

  1042.                 w *= 2;

  1043.             s->linesize[0] = 4*w;

  1044.             s->current_picture[0] = av_mallocz(4*w * h);

  1045.             s->current_picture[1] = s->current_picture[2] = NULL;

  1046.         }else{

  1047.           for(i=0;i<nb_components;i++) {

  1048.             int w, h;

  1049.             w = (s->width  + 8 * s->h_max - 1) / (8 * s->h_max);

  1050.             h = (s->height + 8 * s->v_max - 1) / (8 * s->v_max);

  1051.             w = w * 8 * s->h_count[i];

  1052.             h = h * 8 * s->v_count[i];

  1053.             if (s->interlaced)

  1054.                 w *= 2;

  1055.             s->linesize[i] = w;

  1056.             s->current_picture[i] = av_mallocz(w * h);

  1057. 	    if (!s->current_picture[i])

  1058. 	    {

  1059. 		dprintf("error: no picture buffers allocated\n");

  1060. 		return -1;

  1061. 	    }

  1062.           }

  1063.         }

  1064.         s->first_picture = 0;

  1065.     }

  1066. 

  1067.     if (len != (8+(3*nb_components)))

  1068.     {

  1069. 	dprintf("decode_sof0: error, len(%d) mismatch\n", len);

  1070.     }

  1071.     

  1072.     return 0;

  1073. }

  1074. 

  1075. static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)

  1076. {

  1077.     int code;

  1078.     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);

  1079.     if (code < 0)

  1080.     {

  1081. 	dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,

  1082.                 &s->vlcs[0][dc_index]);

  1083.         return 0xffff;

  1084.     }

  1085. 

  1086.     if(code)

  1087.         return get_xbits(&s->gb, code);

  1088.     else

  1089.         return 0;

  1090. }

  1091. 

  1092. /* decode block and dequantize */

  1093. static int decode_block(MJpegDecodeContext *s, DCTELEM *block, 

  1094.                         int component, int dc_index, int ac_index, int quant_index)

  1095. {

  1096.     int code, i, j, level, val;

  1097.     VLC *ac_vlc;

  1098.     int16_t *quant_matrix;

  1099. 

  1100.     /* DC coef */

  1101.     val = mjpeg_decode_dc(s, dc_index);

  1102.     if (val == 0xffff) {

  1103.         dprintf("error dc\n");

  1104.         return -1;

  1105.     }

  1106.     quant_matrix = s->quant_matrixes[quant_index];

  1107.     val = val * quant_matrix[0] + s->last_dc[component];

  1108.     s->last_dc[component] = val;

  1109.     block[0] = val;

  1110.     /* AC coefs */

  1111.     ac_vlc = &s->vlcs[1][ac_index];

  1112.     i = 1;

  1113.     for(;;) {

  1114. 	code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table, 9, 2);

  1115. 

  1116.         if (code < 0) {

  1117.             dprintf("error ac\n");

  1118.             return -1;

  1119.         }

  1120.         /* EOB */

  1121.         if (code == 0)

  1122.             break;

  1123.         if (code == 0xf0) {

  1124.             i += 16;

  1125.         } else {

  1126.             level = get_xbits(&s->gb, code & 0xf);

  1127.             i += code >> 4;

  1128.             if (i >= 64) {

  1129.                 dprintf("error count: %d\n", i);

  1130.                 return -1;

  1131.             }

  1132.             j = s->scantable.permutated[i];

  1133.             block[j] = level * quant_matrix[j];

  1134.             i++;

  1135.             if (i >= 64)

  1136.                 break;

  1137.         }

  1138.     }

  1139.     return 0;

  1140. }

  1141. 

  1142. static int mjpeg_decode_sos(MJpegDecodeContext *s)

  1143. {

  1144.     int len, nb_components, i, j, n, h, v, ret, point_transform, predictor;

  1145.     int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id;

  1146.     int comp_index[4];

  1147.     int dc_index[4];

  1148.     int ac_index[4];

  1149.     int nb_blocks[4];

  1150.     int h_count[4];

  1151.     int v_count[4];

  1152.     const int block_size= s->lossless ? 1 : 8;

  1153. 

  1154.     /* XXX: verify len field validity */

  1155.     len = get_bits(&s->gb, 16);

  1156.     nb_components = get_bits(&s->gb, 8);

  1157.     if (len != 6+2*nb_components)

  1158.     {

  1159. 	dprintf("decode_sos: invalid len (%d)\n", len);

  1160. 	return -1;

  1161.     }

  1162.     /* XXX: only interleaved scan accepted */

  1163.     if (nb_components != 3)

  1164.     {

  1165. 	dprintf("decode_sos: components(%d) mismatch\n", nb_components);

  1166.         return -1;

  1167.     }

  1168.     vmax = 0;

  1169.     hmax = 0;

  1170.     for(i=0;i<nb_components;i++) {

  1171.         id = get_bits(&s->gb, 8) - 1;

  1172. 	dprintf("component: %d\n", id);

  1173.         /* find component index */

  1174.         for(index=0;index<s->nb_components;index++)

  1175.             if (id == s->component_id[index])

  1176.                 break;

  1177.         if (index == s->nb_components)

  1178. 	{

  1179. 	    dprintf("decode_sos: index(%d) out of components\n", index);

  1180.             return -1;

  1181. 	}

  1182. 

  1183.         comp_index[i] = index;

  1184. 

  1185.         nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1186.         h_count[i] = s->h_count[index];

  1187.         v_count[i] = s->v_count[index];

  1188. 

  1189.         dc_index[i] = get_bits(&s->gb, 4);

  1190.         ac_index[i] = get_bits(&s->gb, 4);

  1191. 

  1192. 	if (dc_index[i] < 0 || ac_index[i] < 0 ||

  1193. 	    dc_index[i] >= 4 || ac_index[i] >= 4)

  1194. 	    goto out_of_range;

  1195. 	switch(s->start_code)

  1196. 	{

  1197. 	    case SOF0:

  1198. 		if (dc_index[i] > 1 || ac_index[i] > 1)

  1199. 		    goto out_of_range;

  1200. 		break;

  1201. 	    case SOF1:

  1202. 	    case SOF2:

  1203. 		if (dc_index[i] > 3 || ac_index[i] > 3)

  1204. 		    goto out_of_range;

  1205. 		break;

  1206. 	    case SOF3:

  1207. 		if (dc_index[i] > 3 || ac_index[i] != 0)

  1208. 		    goto out_of_range;

  1209. 		break;	

  1210. 	}

  1211.     }

  1212. 

  1213.     predictor= get_bits(&s->gb, 8); /* lossless predictor or start of spectral (Ss) */

  1214.     skip_bits(&s->gb, 8); /* Se */

  1215.     skip_bits(&s->gb, 4); /* Ah */

  1216.     point_transform= get_bits(&s->gb, 4); /* Al */

  1217. 

  1218.     for(i=0;i<nb_components;i++) 

  1219.         s->last_dc[i] = 1024;

  1220. 

  1221.     if (nb_components > 1) {

  1222.         /* interleaved stream */

  1223.         mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);

  1224.         mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);

  1225.     } else {

  1226.         h = s->h_max / s->h_count[comp_index[0]];

  1227.         v = s->v_max / s->v_count[comp_index[0]];

  1228.         mb_width  = (s->width  + h * block_size - 1) / (h * block_size);

  1229.         mb_height = (s->height + v * block_size - 1) / (v * block_size);

  1230.         nb_blocks[0] = 1;

  1231.         h_count[0] = 1;

  1232.         v_count[0] = 1;

  1233.     }

  1234. 

  1235.     if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1236.         printf("%s %s p:%d >>:%d\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "", predictor, point_transform);

  1237.     

  1238.     if(s->lossless){

  1239.         if(s->rgb){

  1240.             uint16_t buffer[2048][4];

  1241.             int left[3], top[3], topleft[3];

  1242.             const int linesize= s->linesize[0];

  1243.             const int mask= (1<<s->bits)-1;

  1244.             

  1245.             for(i=0; i<3; i++){

  1246.                 buffer[0][i]= 1 << (s->bits + point_transform - 1);

  1247.             }

  1248.             for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1249.                 const int modified_predictor= mb_y ? 1 : predictor;

  1250.                 uint8_t *ptr = s->current_picture[0] + (linesize * mb_y);

  1251. 

  1252.                 if (s->interlaced && s->bottom_field)

  1253.                     ptr += linesize >> 1;

  1254. 

  1255.                 for(i=0; i<3; i++){

  1256.                     top[i]= left[i]= topleft[i]= buffer[0][i];

  1257.                 }

  1258.                 for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1259.                     if (s->restart_interval && !s->restart_count)

  1260.                         s->restart_count = s->restart_interval;

  1261. 

  1262.                     for(i=0;i<3;i++) {

  1263.                         int pred;

  1264. 

  1265.                         topleft[i]= top[i];

  1266.                         top[i]= buffer[mb_x][i];

  1267. 

  1268.                         PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);

  1269.                         

  1270.                         left[i]= 

  1271.                         buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform));

  1272.                     }

  1273. 

  1274.                     if (s->restart_interval && !--s->restart_count) {

  1275.                         align_get_bits(&s->gb);

  1276.                         skip_bits(&s->gb, 16); /* skip RSTn */

  1277.                     }

  1278.                 }

  1279. 

  1280.                 if(s->rct){

  1281.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1282.                         ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);

  1283.                         ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];

  1284.                         ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];

  1285.                     }

  1286.                 }else if(s->pegasus_rct){

  1287.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1288.                         ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);

  1289.                         ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];

  1290.                         ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];

  1291.                     }

  1292.                 }else{

  1293.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1294.                         ptr[4*mb_x+0] = buffer[mb_x][0];

  1295.                         ptr[4*mb_x+1] = buffer[mb_x][1];

  1296.                         ptr[4*mb_x+2] = buffer[mb_x][2];

  1297.                     }

  1298.                 }

  1299.             }

  1300.         }else{

  1301.             for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1302.                 for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1303.                     if (s->restart_interval && !s->restart_count)

  1304.                         s->restart_count = s->restart_interval;

  1305. 

  1306.                     if(mb_x==0 || mb_y==0 || s->interlaced){

  1307.                         for(i=0;i<nb_components;i++) {

  1308.                             uint8_t *ptr;

  1309.                             int x, y, c, linesize;

  1310.                             n = nb_blocks[i];

  1311.                             c = comp_index[i];

  1312.                             h = h_count[i];

  1313.                             v = v_count[i];

  1314.                             x = 0;

  1315.                             y = 0;

  1316.                             linesize= s->linesize[c];

  1317.                             

  1318.                             for(j=0; j<n; j++) {

  1319.                                 int pred;

  1320. 

  1321.                                 ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1322.                                 if(y==0 && mb_y==0){

  1323.                                     if(x==0 && mb_x==0){

  1324.                                         pred= 128 << point_transform;

  1325.                                     }else{

  1326.                                         pred= ptr[-1];

  1327.                                     }

  1328.                                 }else{

  1329.                                     if(x==0 && mb_x==0){

  1330.                                         pred= ptr[-linesize];

  1331.                                     }else{

  1332.                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1333.                                     }

  1334.                                 }

  1335.                                 

  1336.                                 if (s->interlaced && s->bottom_field)

  1337.                                     ptr += linesize >> 1;

  1338.                                 *ptr= pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform);

  1339. 

  1340.                                 if (++x == h) {

  1341.                                     x = 0;

  1342.                                     y++;

  1343.                                 }

  1344.                             }

  1345.                         }

  1346.                     }else{

  1347.                         for(i=0;i<nb_components;i++) {

  1348.                             uint8_t *ptr;

  1349.                             int x, y, c, linesize;

  1350.                             n = nb_blocks[i];

  1351.                             c = comp_index[i];

  1352.                             h = h_count[i];

  1353.                             v = v_count[i];

  1354.                             x = 0;

  1355.                             y = 0;

  1356.                             linesize= s->linesize[c];

  1357.                             

  1358.                             for(j=0; j<n; j++) {

  1359.                                 int pred;

  1360. 

  1361.                                 ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1362.                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1363.                                 *ptr= pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform);

  1364.                                 if (++x == h) {

  1365.                                     x = 0;

  1366.                                     y++;

  1367.                                 }

  1368.                             }

  1369.                         }

  1370.                     }

  1371.                     if (s->restart_interval && !--s->restart_count) {

  1372.                         align_get_bits(&s->gb);

  1373.                         skip_bits(&s->gb, 16); /* skip RSTn */

  1374.                     }

  1375.                 }

  1376.             }

  1377.         }

  1378.     }else{

  1379.       for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1380.         for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1381.             if (s->restart_interval && !s->restart_count)

  1382.                 s->restart_count = s->restart_interval;

  1383. 

  1384.             for(i=0;i<nb_components;i++) {

  1385.                 uint8_t *ptr;

  1386.                 int x, y, c;

  1387.                 n = nb_blocks[i];

  1388.                 c = comp_index[i];

  1389.                 h = h_count[i];

  1390.                 v = v_count[i];

  1391.                 x = 0;

  1392.                 y = 0;

  1393.                 for(j=0;j<n;j++) {

  1394.                     memset(s->block, 0, sizeof(s->block));

  1395.                     if (decode_block(s, s->block, i, 

  1396.                                      dc_index[i], ac_index[i], 

  1397.                                      s->quant_index[c]) < 0) {

  1398.                         dprintf("error y=%d x=%d\n", mb_y, mb_x);

  1399.                         ret = -1;

  1400.                         goto the_end;

  1401.                     }

  1402. //		    dprintf("mb: %d %d processed\n", mb_y, mb_x);

  1403.                     ptr = s->current_picture[c] + 

  1404.                         (s->linesize[c] * (v * mb_y + y) * 8) + 

  1405.                         (h * mb_x + x) * 8;

  1406.                     if (s->interlaced && s->bottom_field)

  1407.                         ptr += s->linesize[c] >> 1;

  1408.                     s->idct_put(ptr, s->linesize[c], s->block);

  1409.                     if (++x == h) {

  1410.                         x = 0;

  1411.                         y++;

  1412.                     }

  1413.                 }

  1414.             }

  1415. 	    /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

  1416.             if (s->restart_interval && (s->restart_interval < 1350) &&

  1417. 		!--s->restart_count) {

  1418.                 align_get_bits(&s->gb);

  1419.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1420.                 for (j=0; j<nb_components; j++) /* reset dc */

  1421.                     s->last_dc[j] = 1024;

  1422.             }

  1423.         }

  1424.     }

  1425.   }

  1426.     ret = 0;

  1427.  the_end:

  1428.     emms_c();

  1429.     return ret;

  1430.  out_of_range:

  1431.     dprintf("decode_sos: ac/dc index out of range\n");

  1432.     return -1;

  1433. }

  1434. 

  1435. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1436. {

  1437.     if (get_bits(&s->gb, 16) != 4)

  1438. 	return -1;

  1439.     s->restart_interval = get_bits(&s->gb, 16);

  1440.     dprintf("restart interval: %d\n", s->restart_interval);

  1441. 

  1442.     return 0;

  1443. }

  1444. 

  1445. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1446. {

  1447.     int len, id;

  1448. 

  1449.     /* XXX: verify len field validity */

  1450.     len = get_bits(&s->gb, 16);

  1451.     if (len < 5)

  1452. 	return -1;

  1453. 

  1454.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1455.     id = be2me_32(id);

  1456.     len -= 6;

  1457. 

  1458.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1459.         printf("APPx %8X\n", id); 

  1460.     }

  1461.     

  1462.     /* buggy AVID, it puts EOI only at every 10th frame */

  1463.     /* also this fourcc is used by non-avid files too, it holds some

  1464.        informations, but it's always present in AVID creates files */

  1465.     if (id == ff_get_fourcc("AVI1"))

  1466.     {

  1467. 	/* structure:

  1468. 	    4bytes	AVI1

  1469. 	    1bytes	polarity

  1470. 	    1bytes	always zero

  1471. 	    4bytes	field_size

  1472. 	    4bytes	field_size_less_padding

  1473. 	*/

  1474.     	s->buggy_avid = 1;

  1475. //	if (s->first_picture)

  1476. //	    printf("mjpeg: workarounding buggy AVID\n");

  1477. 	s->interlace_polarity = get_bits(&s->gb, 8);

  1478. #if 0

  1479. 	skip_bits(&s->gb, 8);

  1480. 	skip_bits(&s->gb, 32);

  1481. 	skip_bits(&s->gb, 32);

  1482. 	len -= 10;

  1483. #endif

  1484. //	if (s->interlace_polarity)

  1485. //	    printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1486. 	goto out;

  1487.     }

  1488.     

  1489. //    len -= 2;

  1490.     

  1491.     if (id == ff_get_fourcc("JFIF"))

  1492.     {

  1493. 	int t_w, t_h;

  1494. 	skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1495. 	printf("mjpeg: JFIF header found (version: %x.%x)\n",

  1496. 	    get_bits(&s->gb, 8), get_bits(&s->gb, 8));

  1497. 	if (get_bits(&s->gb, 8) == 0)

  1498. 	{

  1499. 	    int x_density, y_density; 

  1500. 	    x_density = get_bits(&s->gb, 16);

  1501. 	    y_density = get_bits(&s->gb, 16);

  1502. 

  1503. 	    dprintf("x/y density: %d (%f), %d (%f)\n", x_density,

  1504. 		(float)x_density, y_density, (float)y_density);

  1505. #if 0

  1506.             //MN: needs to be checked

  1507.             if(x_density)

  1508. //                s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);

  1509. 		s->avctx->aspect_ratio = (float)x_density/y_density;

  1510. 		/* it's better, but every JFIF I have seen stores 1:1 */

  1511.             else

  1512.                 s->avctx->aspect_ratio= 0.0;

  1513. #endif

  1514. 	}

  1515. 	else

  1516. 	{

  1517. 	    skip_bits(&s->gb, 16);

  1518. 	    skip_bits(&s->gb, 16);

  1519. 	}

  1520. 

  1521. 	t_w = get_bits(&s->gb, 8);

  1522. 	t_h = get_bits(&s->gb, 8);

  1523. 	if (t_w && t_h)

  1524. 	{

  1525. 	    /* skip thumbnail */

  1526. 	    if (len-10-(t_w*t_h*3) > 0)

  1527. 		len -= t_w*t_h*3;

  1528. 	}

  1529. 	len -= 10;

  1530. 	goto out;

  1531.     }

  1532.     

  1533.     if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1534.     {

  1535. 	printf("mjpeg: Adobe header found\n");

  1536. 	skip_bits(&s->gb, 16); /* version */

  1537. 	skip_bits(&s->gb, 16); /* flags0 */

  1538. 	skip_bits(&s->gb, 16); /* flags1 */

  1539. 	skip_bits(&s->gb, 8); /* transform */

  1540. 	len -= 7;

  1541. 	goto out;

  1542.     }

  1543. 

  1544.     if (id == ff_get_fourcc("LJIF")){

  1545.         printf("Pegasus lossless jpeg header found\n");

  1546. 	skip_bits(&s->gb, 16); /* version ? */

  1547. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1548. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1549. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1550.         switch( get_bits(&s->gb, 8)){

  1551.         case 1:

  1552.             s->rgb= 1;

  1553.             s->pegasus_rct=0;

  1554.             break;

  1555.         case 2:

  1556.             s->rgb= 1;

  1557.             s->pegasus_rct=1;

  1558.             break;

  1559.         default:

  1560.             printf("unknown colorspace\n");

  1561.         }

  1562.         len -= 9;

  1563.         goto out;

  1564.     }

  1565.     

  1566.     /* Apple MJPEG-A */

  1567.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1568.     {

  1569. 	id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1570. 	id = be2me_32(id);

  1571. 	len -= 4;

  1572. 	if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */

  1573. 	{

  1574. #if 0

  1575. 	    skip_bits(&s->gb, 32); /* field size */

  1576. 	    skip_bits(&s->gb, 32); /* pad field size */

  1577. 	    skip_bits(&s->gb, 32); /* next off */

  1578. 	    skip_bits(&s->gb, 32); /* quant off */

  1579. 	    skip_bits(&s->gb, 32); /* huff off */

  1580. 	    skip_bits(&s->gb, 32); /* image off */

  1581. 	    skip_bits(&s->gb, 32); /* scan off */

  1582. 	    skip_bits(&s->gb, 32); /* data off */

  1583. #endif

  1584. 	    if (s->first_picture)

  1585. 		printf("mjpeg: Apple MJPEG-A header found\n");

  1586. 	}

  1587.     }

  1588. 

  1589. out:

  1590.     /* slow but needed for extreme adobe jpegs */

  1591.     if (len < 0)

  1592. 	printf("mjpeg: error, decode_app parser read over the end\n");

  1593.     while(--len > 0)

  1594. 	skip_bits(&s->gb, 8);

  1595. 

  1596.     return 0;

  1597. }

  1598. 

  1599. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1600. {

  1601.     /* XXX: verify len field validity */

  1602.     unsigned int len = get_bits(&s->gb, 16);

  1603.     if (len >= 2 && len < 32768) {

  1604. 	/* XXX: any better upper bound */

  1605. 	uint8_t *cbuf = av_malloc(len - 1);

  1606. 	if (cbuf) {

  1607. 	    int i;

  1608. 	    for (i = 0; i < len - 2; i++)

  1609. 		cbuf[i] = get_bits(&s->gb, 8);

  1610. 	    if (i > 0 && cbuf[i-1] == '\n')

  1611. 		cbuf[i-1] = 0;

  1612. 	    else

  1613. 		cbuf[i] = 0;

  1614. 

  1615. 	    printf("mjpeg comment: '%s'\n", cbuf);

  1616. 

  1617. 	    /* buggy avid, it puts EOI only at every 10th frame */

  1618. 	    if (!strcmp(cbuf, "AVID"))

  1619. 	    {

  1620. 		s->buggy_avid = 1;

  1621. 		//	if (s->first_picture)

  1622. 		//	    printf("mjpeg: workarounding buggy AVID\n");

  1623. 	    }

  1624. 

  1625. 	    av_free(cbuf);

  1626. 	}

  1627.     }

  1628. 

  1629.     return 0;

  1630. }

  1631. 

  1632. #if 0

  1633. static int valid_marker_list[] =

  1634. {

  1635.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1636. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1637. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1638. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1639. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1640. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1641. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1642. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1643. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1644. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1645. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1646. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1647. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1648. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1649. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1650. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1651. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1652. }

  1653. #endif

  1654. 

  1655. /* return the 8 bit start code value and update the search

  1656.    state. Return -1 if no start code found */

  1657. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1658. {

  1659.     uint8_t *buf_ptr;

  1660.     unsigned int v, v2;

  1661.     int val;

  1662. #ifdef DEBUG

  1663.     int skipped=0;

  1664. #endif

  1665. 

  1666.     buf_ptr = *pbuf_ptr;

  1667.     while (buf_ptr < buf_end) {

  1668.         v = *buf_ptr++;

  1669. 	v2 = *buf_ptr;

  1670.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {

  1671. 	    val = *buf_ptr++;

  1672. 	    goto found;

  1673.         }

  1674. #ifdef DEBUG

  1675. 	skipped++;

  1676. #endif

  1677.     }

  1678.     val = -1;

  1679. found:

  1680. #ifdef DEBUG

  1681.     dprintf("find_marker skipped %d bytes\n", skipped);

  1682. #endif

  1683.     *pbuf_ptr = buf_ptr;

  1684.     return val;

  1685. }

  1686. 

  1687. static int mjpeg_decode_frame(AVCodecContext *avctx, 

  1688.                               void *data, int *data_size,

  1689.                               uint8_t *buf, int buf_size)

  1690. {

  1691.     MJpegDecodeContext *s = avctx->priv_data;

  1692.     uint8_t *buf_end, *buf_ptr;

  1693.     int i, start_code;

  1694.     AVPicture *picture = data;

  1695. 

  1696.     *data_size = 0;

  1697. 

  1698.     /* no supplementary picture */

  1699.     if (buf_size == 0)

  1700.         return 0;

  1701. 

  1702.     buf_ptr = buf;

  1703.     buf_end = buf + buf_size;

  1704.     while (buf_ptr < buf_end) {

  1705.         /* find start next marker */

  1706.         start_code = find_marker(&buf_ptr, buf_end);

  1707. 	{

  1708. 	    /* EOF */

  1709.             if (start_code < 0) {

  1710. 		goto the_end;

  1711.             } else {

  1712.                 dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);

  1713. 		

  1714. 		if ((buf_end - buf_ptr) > s->buffer_size)

  1715. 		{

  1716. 		    av_free(s->buffer);

  1717. 		    s->buffer_size = buf_end-buf_ptr;

  1718. 		    s->buffer = av_malloc(s->buffer_size);

  1719. 		    dprintf("buffer too small, expanding to %d bytes\n",

  1720. 			s->buffer_size);

  1721. 		}

  1722. 		

  1723. 		/* unescape buffer of SOS */

  1724. 		if (start_code == SOS)

  1725. 		{

  1726. 		    uint8_t *src = buf_ptr;

  1727. 		    uint8_t *dst = s->buffer;

  1728. 

  1729. 		    while (src<buf_end)

  1730. 		    {

  1731. 			uint8_t x = *(src++);

  1732. 

  1733. 			*(dst++) = x;

  1734. 			if (x == 0xff)

  1735. 			{

  1736. 			    while(*src == 0xff) src++;

  1737. 

  1738. 			    x = *(src++);

  1739. 			    if (x >= 0xd0 && x <= 0xd7)

  1740. 				*(dst++) = x;

  1741. 			    else if (x)

  1742. 				break;

  1743. 			}

  1744. 		    }

  1745. 		    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1746. 		    

  1747. 		    dprintf("escaping removed %d bytes\n",

  1748. 			(buf_end - buf_ptr) - (dst - s->buffer));

  1749. 		}

  1750. 		else

  1751. 		    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1752. 		

  1753. 		s->start_code = start_code;

  1754.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1755.                     printf("startcode: %X\n", start_code);

  1756.                 }

  1757. 

  1758. 		/* process markers */

  1759. 		if (start_code >= 0xd0 && start_code <= 0xd7) {

  1760. 		    dprintf("restart marker: %d\n", start_code&0x0f);

  1761. 		} else if (s->first_picture) {

  1762. 		    /* APP fields */

  1763. 		    if (start_code >= 0xe0 && start_code <= 0xef)

  1764. 			mjpeg_decode_app(s);

  1765. 		    /* Comment */

  1766. 		    else if (start_code == COM)

  1767. 			mjpeg_decode_com(s);

  1768. 		}

  1769. 

  1770.                 switch(start_code) {

  1771.                 case SOI:

  1772. 		    s->restart_interval = 0;

  1773.                     /* nothing to do on SOI */

  1774.                     break;

  1775.                 case DQT:

  1776.                     mjpeg_decode_dqt(s);

  1777.                     break;

  1778.                 case DHT:

  1779.                     mjpeg_decode_dht(s);

  1780.                     break;

  1781.                 case SOF0:

  1782.                     s->lossless=0;

  1783.                     if (mjpeg_decode_sof(s) < 0) 

  1784. 			return -1;

  1785.                     break;

  1786.                 case SOF3:

  1787.                     s->lossless=1;

  1788.                     if (mjpeg_decode_sof(s) < 0) 

  1789. 			return -1;

  1790.                     break;

  1791. 		case EOI:

  1792. eoi_parser:

  1793. 		    {

  1794.                         if (s->interlaced) {

  1795.                             s->bottom_field ^= 1;

  1796.                             /* if not bottom field, do not output image yet */

  1797.                             if (s->bottom_field)

  1798.                                 goto not_the_end;

  1799.                         }

  1800.                         for(i=0;i<3;i++) {

  1801.                             picture->data[i] = s->current_picture[i];

  1802. 			    picture->linesize[i] = (s->interlaced) ?

  1803. 				s->linesize[i] >> 1 : s->linesize[i];

  1804.                         }

  1805.                         *data_size = sizeof(AVPicture);

  1806.                         avctx->height = s->height;

  1807.                         if (s->interlaced)

  1808.                             avctx->height *= 2;

  1809.                         avctx->width = s->width;

  1810.                         /* XXX: not complete test ! */

  1811.                         switch((s->h_count[0] << 4) | s->v_count[0]) {

  1812.                         case 0x11:

  1813.                             if(s->rgb){

  1814.                                 avctx->pix_fmt = PIX_FMT_RGBA32;

  1815.                             }else

  1816.                                 avctx->pix_fmt = PIX_FMT_YUV444P;

  1817.                             break;

  1818.                         case 0x21:

  1819.                             avctx->pix_fmt = PIX_FMT_YUV422P;

  1820.                             break;

  1821.                         default:

  1822.                         case 0x22:

  1823.                             avctx->pix_fmt = PIX_FMT_YUV420P;

  1824.                             break;

  1825.                         }

  1826.                         /* dummy quality */

  1827.                         /* XXX: infer it with matrix */

  1828. //                    	avctx->quality = 3; 

  1829.                         goto the_end;

  1830.                     }

  1831. 		    break;

  1832.                 case SOS:

  1833.                     mjpeg_decode_sos(s);

  1834. 		    /* buggy avid puts EOI every 10-20th frame */

  1835. 		    /* if restart period is over process EOI */

  1836. 		    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1837. 			goto eoi_parser;

  1838.                     break;

  1839. 		case DRI:

  1840. 		    mjpeg_decode_dri(s);

  1841. 		    break;

  1842. 		case SOF1:

  1843. 		case SOF2:

  1844. 		case SOF5:

  1845. 		case SOF6:

  1846. 		case SOF7:

  1847. 		case SOF9:

  1848. 		case SOF10:

  1849. 		case SOF11:

  1850. 		case SOF13:

  1851. 		case SOF14:

  1852. 		case SOF15:

  1853. 		case JPG:

  1854. 		    printf("mjpeg: unsupported coding type (%x)\n", start_code);

  1855. 		    break;

  1856. //		default:

  1857. //		    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1858. //		    break;

  1859.                 }

  1860. 

  1861. not_the_end:

  1862. 		/* eof process start code */

  1863. 		buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1864. 		dprintf("marker parser used %d bytes (%d bits)\n",

  1865. 		    (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1866.             }

  1867.         }

  1868.     }

  1869. the_end:

  1870.     dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);

  1871. //    return buf_end - buf_ptr;

  1872.     return buf_ptr - buf;

  1873. }

  1874. 

  1875. static int mjpegb_decode_frame(AVCodecContext *avctx, 

  1876.                               void *data, int *data_size,

  1877.                               uint8_t *buf, int buf_size)

  1878. {

  1879.     MJpegDecodeContext *s = avctx->priv_data;

  1880.     uint8_t *buf_end, *buf_ptr;

  1881.     int i;

  1882.     AVPicture *picture = data;

  1883.     GetBitContext hgb; /* for the header */

  1884.     uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

  1885.     uint32_t field_size;

  1886. 

  1887.     *data_size = 0;

  1888. 

  1889.     /* no supplementary picture */

  1890.     if (buf_size == 0)

  1891.         return 0;

  1892. 

  1893.     buf_ptr = buf;

  1894.     buf_end = buf + buf_size;

  1895.     

  1896. read_header:

  1897.     /* reset on every SOI */

  1898.     s->restart_interval = 0;

  1899. 

  1900.     init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);

  1901. 

  1902.     skip_bits(&hgb, 32); /* reserved zeros */

  1903.     

  1904.     if (get_bits(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

  1905.     {

  1906. 	dprintf("not mjpeg-b (bad fourcc)\n");

  1907. 	return 0;

  1908.     }

  1909. 

  1910.     field_size = get_bits(&hgb, 32); /* field size */

  1911.     dprintf("field size: 0x%x\n", field_size);

  1912.     skip_bits(&hgb, 32); /* padded field size */

  1913.     second_field_offs = get_bits(&hgb, 32);

  1914.     dprintf("second field offs: 0x%x\n", second_field_offs);

  1915.     if (second_field_offs)

  1916. 	s->interlaced = 1;

  1917. 

  1918.     dqt_offs = get_bits(&hgb, 32);

  1919.     dprintf("dqt offs: 0x%x\n", dqt_offs);

  1920.     if (dqt_offs)

  1921.     {

  1922. 	init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

  1923. 	s->start_code = DQT;

  1924. 	mjpeg_decode_dqt(s);

  1925.     }

  1926.     

  1927.     dht_offs = get_bits(&hgb, 32);

  1928.     dprintf("dht offs: 0x%x\n", dht_offs);

  1929.     if (dht_offs)

  1930.     {

  1931. 	init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

  1932. 	s->start_code = DHT;

  1933. 	mjpeg_decode_dht(s);

  1934.     }

  1935. 

  1936.     sof_offs = get_bits(&hgb, 32);

  1937.     dprintf("sof offs: 0x%x\n", sof_offs);

  1938.     if (sof_offs)

  1939.     {

  1940. 	init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

  1941. 	s->start_code = SOF0;

  1942. 	if (mjpeg_decode_sof(s) < 0)

  1943. 	    return -1;

  1944.     }

  1945. 

  1946.     sos_offs = get_bits(&hgb, 32);

  1947.     dprintf("sos offs: 0x%x\n", sos_offs);

  1948.     if (sos_offs)

  1949.     {

  1950. //	init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);

  1951. 	init_get_bits(&s->gb, buf+sos_offs, field_size*8);

  1952. 	s->start_code = SOS;

  1953. 	mjpeg_decode_sos(s);

  1954.     }

  1955. 

  1956.     skip_bits(&hgb, 32); /* start of data offset */

  1957. 

  1958.     if (s->interlaced) {

  1959.         s->bottom_field ^= 1;

  1960.         /* if not bottom field, do not output image yet */

  1961.         if (s->bottom_field && second_field_offs)

  1962. 	{

  1963. 	    buf_ptr = buf + second_field_offs;

  1964. 	    second_field_offs = 0;

  1965. 	    goto read_header;

  1966.     	}

  1967.     }

  1968. 

  1969.     for(i=0;i<3;i++) {

  1970.         picture->data[i] = s->current_picture[i];

  1971.         picture->linesize[i] = (s->interlaced) ?

  1972.     	    s->linesize[i] >> 1 : s->linesize[i];

  1973.     }

  1974.     *data_size = sizeof(AVPicture);

  1975.     avctx->height = s->height;

  1976.     if (s->interlaced)

  1977.         avctx->height *= 2;

  1978.     avctx->width = s->width;

  1979.     /* XXX: not complete test ! */

  1980.     switch((s->h_count[0] << 4) | s->v_count[0]) {

  1981.         case 0x11:

  1982.     	    avctx->pix_fmt = PIX_FMT_YUV444P;

  1983.             break;

  1984.         case 0x21:

  1985.             avctx->pix_fmt = PIX_FMT_YUV422P;

  1986.             break;

  1987.         default:

  1988. 	case 0x22:

  1989.             avctx->pix_fmt = PIX_FMT_YUV420P;

  1990.             break;

  1991.     }

  1992.     /* dummy quality */

  1993.     /* XXX: infer it with matrix */

  1994. //    avctx->quality = 3; 

  1995. 

  1996.     return buf_ptr - buf;

  1997. }

  1998. 

  1999. 

  2000. static int mjpeg_decode_end(AVCodecContext *avctx)

  2001. {

  2002.     MJpegDecodeContext *s = avctx->priv_data;

  2003.     int i, j;

  2004. 

  2005.     av_free(s->buffer);

  2006.     for(i=0;i<MAX_COMPONENTS;i++)

  2007.         av_free(s->current_picture[i]);

  2008.     for(i=0;i<2;i++) {

  2009.         for(j=0;j<4;j++)

  2010.             free_vlc(&s->vlcs[i][j]);

  2011.     }

  2012.     return 0;

  2013. }

  2014. 

  2015. AVCodec mjpeg_decoder = {

  2016.     "mjpeg",

  2017.     CODEC_TYPE_VIDEO,

  2018.     CODEC_ID_MJPEG,

  2019.     sizeof(MJpegDecodeContext),

  2020.     mjpeg_decode_init,

  2021.     NULL,

  2022.     mjpeg_decode_end,

  2023.     mjpeg_decode_frame,

  2024.     0,

  2025.     NULL

  2026. };

  2027. 

  2028. AVCodec mjpegb_decoder = {

  2029.     "mjpegb",

  2030.     CODEC_TYPE_VIDEO,

  2031.     CODEC_ID_MJPEGB,

  2032.     sizeof(MJpegDecodeContext),

  2033.     mjpeg_decode_init,

  2034.     NULL,

  2035.     mjpeg_decode_end,

  2036.     mjpegb_decode_frame,

  2037.     0,

  2038.     NULL

  2039. };

  2040. 

  2041. AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them

  2042.     "ljpeg",

  2043.     CODEC_TYPE_VIDEO,

  2044.     CODEC_ID_LJPEG,

  2045.     sizeof(MpegEncContext),

  2046.     MPV_encode_init,

  2047.     encode_picture_lossless,

  2048.     MPV_encode_end,

  2049. };