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FFmpeg/libavcodec/mjpeg.c

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  1. /*

  2.  * MJPEG encoder and decoder

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

  4.  *

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

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

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

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

  9.  *

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

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

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

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

  18.  *

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

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

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

  22.  */

  23. 

  24. /**

  25.  * @file mjpeg.c

  26.  * MJPEG encoder and decoder.

  27.  */

  28.  

  29. //#define DEBUG

  30. #include <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. #ifdef CONFIG_ENCODERS

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

  297. {

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

  299.     put_bits(p, 8, code);

  300. }

  301. 

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

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

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

  305. {

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

  307.     int n, i;

  308. 

  309.     put_bits(p, 4, table_class);

  310.     put_bits(p, 4, table_id);

  311. 

  312.     n = 0;

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

  314.         n += bits_table[i];

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

  316.     }

  317. 

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

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

  320. 

  321.     return n + 17;

  322. }

  323. 

  324. static void jpeg_table_header(MpegEncContext *s)

  325. {

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

  327.     int i, j, size;

  328.     uint8_t *ptr;

  329. 

  330.     /* quant matrixes */

  331.     put_marker(p, DQT);

  332. #ifdef TWOMATRIXES

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

  334. #else

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

  336. #endif

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

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

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

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

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

  342.     }

  343. #ifdef TWOMATRIXES

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

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

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

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

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

  349.     }

  350. #endif

  351. 

  352.     /* huffman table */

  353.     put_marker(p, DHT);

  354.     flush_put_bits(p);

  355.     ptr = pbBufPtr(p);

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

  357.     size = 2;

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

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

  360.     

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

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

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

  364.     ptr[1] = size;

  365. }

  366. 

  367. static void jpeg_put_comments(MpegEncContext *s)

  368. {

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

  370.     int size;

  371.     uint8_t *ptr;

  372. 

  373.     if (s->aspect_ratio_info /* && !lossless */)

  374.     {

  375.     /* JFIF header */

  376.     put_marker(p, APP0);

  377.     put_bits(p, 16, 16);

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

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

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

  381.     switch(s->aspect_ratio_info)

  382.     {

  383. 	case FF_ASPECT_4_3_625:

  384. 	case FF_ASPECT_4_3_525:

  385. 	    put_bits(p, 16, 4); 

  386. 	    put_bits(p, 16, 3);

  387. 	    break;

  388. 	case FF_ASPECT_16_9_625:

  389. 	case FF_ASPECT_16_9_525:

  390. 	    put_bits(p, 16, 16); 

  391. 	    put_bits(p, 16, 9);

  392. 	    break;

  393. 	case FF_ASPECT_EXTENDED:

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

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

  396. 	    break;

  397. 	case FF_ASPECT_SQUARE:

  398. 	default:

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

  400. 	    put_bits(p, 16, 1);

  401. 	    break;

  402.     }

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

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

  405.     }

  406. 

  407.     /* comment */

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

  409.         put_marker(p, COM);

  410.         flush_put_bits(p);

  411.         ptr = pbBufPtr(p);

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

  413.         put_string(p, LIBAVCODEC_IDENT);

  414.         size = strlen(LIBAVCODEC_IDENT)+3;

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

  416.         ptr[1] = size;

  417.     }

  418. }

  419. 

  420. void mjpeg_picture_header(MpegEncContext *s)

  421. {

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

  423. 

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

  425. 

  426.     if (!s->mjpeg_data_only_frames)

  427.     {

  428.     jpeg_put_comments(s);    

  429. 

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

  431. 

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

  433. 

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

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

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

  437.     else

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

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

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

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

  442.     

  443.     /* Y component */

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

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

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

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

  448.     

  449.     /* Cb component */

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

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

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

  453. #ifdef TWOMATRIXES

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

  455. #else

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

  457. #endif

  458. 

  459.     /* Cr component */

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

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

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

  463. #ifdef TWOMATRIXES

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

  465. #else

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

  467. #endif

  468.     }

  469. 

  470.     /* scan header */

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

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

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

  474.     

  475.     /* Y component */

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

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

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

  479.     

  480.     /* Cb component */

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

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

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

  484.     

  485.     /* Cr component */

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

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

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

  489. 

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

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

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

  493. }

  494. 

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

  496. {

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

  498.     int i, ff_count;

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

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

  501.     

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

  503.     size >>= 3;

  504.     

  505.     ff_count=0;

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

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

  508.     }

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

  510.         int acc, v;

  511. 

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

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

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

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

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

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

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

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

  520. 

  521.         acc>>=4;

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

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

  524.         ff_count+= acc&0xFF;

  525.     }

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

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

  528.     }

  529. 

  530.     if(ff_count==0) return;

  531.     

  532.     /* skip put bits */

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

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

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

  536.     flush_put_bits(&s->pb); 

  537. 

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

  539.         int v= buf[i];

  540. 

  541.         if(v==0xFF){

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

  543.             buf[i+ff_count]= 0;

  544.             ff_count--;

  545.         }

  546. 

  547.         buf[i+ff_count]= v;

  548.     }

  549. }

  550. 

  551. void mjpeg_picture_trailer(MpegEncContext *s)

  552. {

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

  554.     

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

  556.     flush_put_bits(&s->pb);

  557. 

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

  559.     

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

  561. 

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

  563. }

  564. 

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

  566. 				   uint8_t *huff_size, uint16_t *huff_code)

  567. {

  568.     int mant, nbits;

  569. 

  570.     if (val == 0) {

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

  572.     } else {

  573.         mant = val;

  574.         if (val < 0) {

  575.             val = -val;

  576.             mant--;

  577.         }

  578.         

  579.         nbits= av_log2_16bit(val) + 1;

  580.             

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

  582.         

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

  584.     }

  585. }

  586. 

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

  588. {

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

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

  591.     MJpegContext *m = s->mjpeg_ctx;

  592.     uint8_t *huff_size_ac;

  593.     uint16_t *huff_code_ac;

  594.     

  595.     /* DC coef */

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

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

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

  599.     if (n < 4) {

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

  601.         huff_size_ac = m->huff_size_ac_luminance;

  602.         huff_code_ac = m->huff_code_ac_luminance;

  603.     } else {

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

  605.         huff_size_ac = m->huff_size_ac_chrominance;

  606.         huff_code_ac = m->huff_code_ac_chrominance;

  607.     }

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

  609.     

  610.     /* AC coefs */

  611.     

  612.     run = 0;

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

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

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

  616.         val = block[j];

  617.         if (val == 0) {

  618.             run++;

  619.         } else {

  620.             while (run >= 16) {

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

  622.                 run -= 16;

  623.             }

  624.             mant = val;

  625.             if (val < 0) {

  626.                 val = -val;

  627.                 mant--;

  628.             }

  629.             

  630.             nbits= av_log2(val) + 1;

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

  632. 

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

  634.         

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

  636.             run = 0;

  637.         }

  638.     }

  639. 

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

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

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

  643. }

  644. 

  645. void mjpeg_encode_mb(MpegEncContext *s, 

  646.                      DCTELEM block[6][64])

  647. {

  648.     int i;

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

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

  651.     }

  652. }

  653. 

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

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

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

  657.     AVFrame *pict = data;

  658.     const int width= s->width;

  659.     const int height= s->height;

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

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

  662. 

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

  664. 

  665.     *p = *pict;

  666.     p->pict_type= FF_I_TYPE;

  667.     p->key_frame= 1;

  668.     

  669.     mjpeg_picture_header(s);

  670. 

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

  672. 

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

  674.         int x, y, i;

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

  676.         uint16_t buffer[2048][4];

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

  678. 

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

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

  681.         }

  682. 

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

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

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

  686. 

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

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

  689.             }

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

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

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

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

  694. 

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

  696.                     int pred, diff;

  697. 

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

  699.                         

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

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

  702.                     

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

  704. 

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

  706.                     

  707.                     if(i==0)

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

  709.                     else

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

  711.                 }

  712.             }

  713.         }

  714.     }else{

  715.         int mb_x, mb_y, i;

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

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

  718.         

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

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

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

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

  723.                         uint8_t *ptr;

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

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

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

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

  728. 

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

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

  731.                                 int pred;

  732. 

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

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

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

  736.                                         pred= 128;

  737.                                     }else{

  738.                                         pred= ptr[-1];

  739.                                     }

  740.                                 }else{

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

  742.                                         pred= ptr[-linesize];

  743.                                     }else{

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

  745.                                     }

  746.                                 }

  747.                                 

  748.                                 if(i==0)

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

  750.                                 else

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

  752.                             }

  753.                         }

  754.                     }

  755.                 }else{

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

  757.                         uint8_t *ptr;

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

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

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

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

  762.                              

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

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

  765.                                 int pred;

  766. 

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

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

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

  770. 

  771.                                 if(i==0)

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

  773.                                 else

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

  775.                             }

  776.                         }

  777.                     }

  778.                 }

  779.             }

  780.         }

  781.     }

  782. 

  783.     emms_c();

  784.     

  785.     mjpeg_picture_trailer(s);

  786.     s->picture_number++;

  787. 

  788.     flush_put_bits(&s->pb);

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

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

  791. }

  792. 

  793. #endif //CONFIG_ENCODERS

  794. 

  795. /******************************************/

  796. /* decoding */

  797. 

  798. #define MAX_COMPONENTS 4

  799. 

  800. typedef struct MJpegDecodeContext {

  801.     AVCodecContext *avctx;

  802.     GetBitContext gb;

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

  804. 

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

  806.     int buffer_size;

  807.     uint8_t *buffer;

  808. 

  809.     int16_t quant_matrixes[4][64];

  810.     VLC vlcs[2][4];

  811. 

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

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

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

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

  816.     int lossless;

  817.     int rgb;

  818.     int rct;            /* standard rct */  

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

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

  821. 

  822.     int width, height;

  823.     int nb_components;

  824.     int component_id[MAX_COMPONENTS];

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

  826.     int v_count[MAX_COMPONENTS];

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

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

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

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

  831.     int linesize[MAX_COMPONENTS];

  832.     DCTELEM block[64] __align8;

  833.     ScanTable scantable;

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

  835. 

  836.     int restart_interval;

  837.     int restart_count;

  838. 

  839.     int buggy_avid;

  840.     int interlace_polarity;

  841. } MJpegDecodeContext;

  842. 

  843. static int mjpeg_decode_dht(MJpegDecodeContext *s);

  844. 

  845. static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, 

  846.                       int nb_codes)

  847. {

  848.     uint8_t huff_size[256];

  849.     uint16_t huff_code[256];

  850. 

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

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

  853.     

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

  855. }

  856. 

  857. static int mjpeg_decode_init(AVCodecContext *avctx)

  858. {

  859.     MJpegDecodeContext *s = avctx->priv_data;

  860.     MpegEncContext s2;

  861. 

  862.     s->avctx = avctx;

  863. 

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

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

  866.     s2.flags= avctx->flags;

  867.     s2.avctx= avctx;

  868. //    s2->out_format = FMT_MJPEG;

  869.     s2.width = 8;

  870.     s2.height = 8;

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

  872.        return -1;

  873.     s->scantable= s2.intra_scantable;

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

  875.     MPV_common_end(&s2);

  876. 

  877.     s->mpeg_enc_ctx_allocated = 0;

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

  879. 				but photojpg files could ahive bigger sizes */

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

  881.     if (!s->buffer)

  882. 	return -1;

  883.     s->start_code = -1;

  884.     s->first_picture = 1;

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

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

  887.     

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

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

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

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

  892. 

  893.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  894.     {

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

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

  897. 	mjpeg_decode_dht(s);

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

  899.     }

  900. 

  901.     return 0;

  902. }

  903. 

  904. /* quantize tables */

  905. static int mjpeg_decode_dqt(MJpegDecodeContext *s)

  906. {

  907.     int len, index, i, j;

  908.     

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

  910. 

  911.     while (len >= 65) {

  912.         /* only 8 bit precision handled */

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

  914. 	{

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

  916.             return -1;

  917. 	}

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

  919.         if (index >= 4)

  920.             return -1;

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

  922.         /* read quant table */

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

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

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

  926.         }

  927.         len -= 65;

  928.     }

  929.     

  930.     return 0;

  931. }

  932. 

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

  934. static int mjpeg_decode_dht(MJpegDecodeContext *s)

  935. {

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

  937.     uint8_t bits_table[17];

  938.     uint8_t val_table[256];

  939.     

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

  941. 

  942.     while (len > 0) {

  943.         if (len < 17)

  944.             return -1;

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

  946.         if (class >= 2)

  947.             return -1;

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

  949.         if (index >= 4)

  950.             return -1;

  951.         n = 0;

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

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

  954.             n += bits_table[i];

  955.         }

  956.         len -= 17;

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

  958.             return -1;

  959. 

  960.         code_max = 0;

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

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

  963.             if (v > code_max)

  964.                 code_max = v;

  965.             val_table[i] = v;

  966.         }

  967.         len -= n;

  968. 

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

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

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

  972.                class, index, code_max + 1);

  973.         if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1) < 0){

  974.             return -1;

  975.         }

  976.     }

  977.     return 0;

  978. }

  979. 

  980. static int mjpeg_decode_sof(MJpegDecodeContext *s)

  981. {

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

  983. 

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

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

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

  987.     

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

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

  990. 

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

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

  993.         return -1;

  994.     }

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

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

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

  998. 

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

  1000.     if (nb_components <= 0 ||

  1001.         nb_components > MAX_COMPONENTS)

  1002.         return -1;

  1003.     s->nb_components = nb_components;

  1004.     s->h_max = 1;

  1005.     s->v_max = 1;

  1006.     for(i=0;i<nb_components;i++) {

  1007.         /* component id */

  1008.         s->component_id[i] = get_bits(&s->gb, 8) - 1;

  1009.         s->h_count[i] = get_bits(&s->gb, 4);

  1010.         s->v_count[i] = get_bits(&s->gb, 4);

  1011.         /* compute hmax and vmax (only used in interleaved case) */

  1012.         if (s->h_count[i] > s->h_max)

  1013.             s->h_max = s->h_count[i];

  1014.         if (s->v_count[i] > s->v_max)

  1015.             s->v_max = s->v_count[i];

  1016.         s->quant_index[i] = get_bits(&s->gb, 8);

  1017.         if (s->quant_index[i] >= 4)

  1018.             return -1;

  1019.         dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],

  1020. 	    s->v_count[i], s->component_id[i], s->quant_index[i]);

  1021.     }

  1022.     

  1023.     if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;

  1024. 

  1025.     /* if different size, realloc/alloc picture */

  1026.     /* XXX: also check h_count and v_count */

  1027.     if (width != s->width || height != s->height) {

  1028.         for(i=0;i<MAX_COMPONENTS;i++)

  1029.             av_freep(&s->current_picture[i]);

  1030.         s->width = width;

  1031.         s->height = height;

  1032.         /* test interlaced mode */

  1033.         if (s->first_picture &&

  1034.             s->org_height != 0 &&

  1035.             s->height < ((s->org_height * 3) / 4)) {

  1036.             s->interlaced = 1;

  1037. //	    s->bottom_field = (s->interlace_polarity) ? 1 : 0;

  1038. 	    s->bottom_field = 0;

  1039.         }

  1040. 

  1041.         if(s->rgb){

  1042.             int w, h;

  1043.             w = s->width;

  1044.             h = s->height;

  1045.             if (s->interlaced)

  1046.                 w *= 2;

  1047.             s->linesize[0] = 4*w;

  1048.             s->current_picture[0] = av_mallocz(4*w * h);

  1049.             s->current_picture[1] = s->current_picture[2] = NULL;

  1050.         }else{

  1051.           for(i=0;i<nb_components;i++) {

  1052.             int w, h;

  1053.             w = (s->width  + 8 * s->h_max - 1) / (8 * s->h_max);

  1054.             h = (s->height + 8 * s->v_max - 1) / (8 * s->v_max);

  1055.             w = w * 8 * s->h_count[i];

  1056.             h = h * 8 * s->v_count[i];

  1057.             if (s->interlaced)

  1058.                 w *= 2;

  1059.             s->linesize[i] = w;

  1060.             s->current_picture[i] = av_mallocz(w * h);

  1061. 	    if (!s->current_picture[i])

  1062. 	    {

  1063. 		dprintf("error: no picture buffers allocated\n");

  1064. 		return -1;

  1065. 	    }

  1066.           }

  1067.         }

  1068.         s->first_picture = 0;

  1069.     }

  1070. 

  1071.     if (len != (8+(3*nb_components)))

  1072.     {

  1073. 	dprintf("decode_sof0: error, len(%d) mismatch\n", len);

  1074.     }

  1075.     

  1076.     return 0;

  1077. }

  1078. 

  1079. static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)

  1080. {

  1081.     int code;

  1082.     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);

  1083.     if (code < 0)

  1084.     {

  1085. 	dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,

  1086.                 &s->vlcs[0][dc_index]);

  1087.         return 0xffff;

  1088.     }

  1089. 

  1090.     if(code)

  1091.         return get_xbits(&s->gb, code);

  1092.     else

  1093.         return 0;

  1094. }

  1095. 

  1096. /* decode block and dequantize */

  1097. static int decode_block(MJpegDecodeContext *s, DCTELEM *block, 

  1098.                         int component, int dc_index, int ac_index, int quant_index)

  1099. {

  1100.     int code, i, j, level, val;

  1101.     VLC *ac_vlc;

  1102.     int16_t *quant_matrix;

  1103. 

  1104.     /* DC coef */

  1105.     val = mjpeg_decode_dc(s, dc_index);

  1106.     if (val == 0xffff) {

  1107.         dprintf("error dc\n");

  1108.         return -1;

  1109.     }

  1110.     quant_matrix = s->quant_matrixes[quant_index];

  1111.     val = val * quant_matrix[0] + s->last_dc[component];

  1112.     s->last_dc[component] = val;

  1113.     block[0] = val;

  1114.     /* AC coefs */

  1115.     ac_vlc = &s->vlcs[1][ac_index];

  1116.     i = 1;

  1117.     for(;;) {

  1118. 	code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table, 9, 2);

  1119. 

  1120.         if (code < 0) {

  1121.             dprintf("error ac\n");

  1122.             return -1;

  1123.         }

  1124.         /* EOB */

  1125.         if (code == 0)

  1126.             break;

  1127.         if (code == 0xf0) {

  1128.             i += 16;

  1129.         } else {

  1130.             level = get_xbits(&s->gb, code & 0xf);

  1131.             i += code >> 4;

  1132.             if (i >= 64) {

  1133.                 dprintf("error count: %d\n", i);

  1134.                 return -1;

  1135.             }

  1136.             j = s->scantable.permutated[i];

  1137.             block[j] = level * quant_matrix[j];

  1138.             i++;

  1139.             if (i >= 64)

  1140.                 break;

  1141.         }

  1142.     }

  1143.     return 0;

  1144. }

  1145. 

  1146. static int mjpeg_decode_sos(MJpegDecodeContext *s)

  1147. {

  1148.     int len, nb_components, i, j, n, h, v, ret, point_transform, predictor;

  1149.     int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id;

  1150.     int comp_index[4];

  1151.     int dc_index[4];

  1152.     int ac_index[4];

  1153.     int nb_blocks[4];

  1154.     int h_count[4];

  1155.     int v_count[4];

  1156.     const int block_size= s->lossless ? 1 : 8;

  1157. 

  1158.     /* XXX: verify len field validity */

  1159.     len = get_bits(&s->gb, 16);

  1160.     nb_components = get_bits(&s->gb, 8);

  1161.     if (len != 6+2*nb_components)

  1162.     {

  1163. 	dprintf("decode_sos: invalid len (%d)\n", len);

  1164. 	return -1;

  1165.     }

  1166.     /* XXX: only interleaved scan accepted */

  1167.     if (nb_components != 3)

  1168.     {

  1169. 	dprintf("decode_sos: components(%d) mismatch\n", nb_components);

  1170.         return -1;

  1171.     }

  1172.     vmax = 0;

  1173.     hmax = 0;

  1174.     for(i=0;i<nb_components;i++) {

  1175.         id = get_bits(&s->gb, 8) - 1;

  1176. 	dprintf("component: %d\n", id);

  1177.         /* find component index */

  1178.         for(index=0;index<s->nb_components;index++)

  1179.             if (id == s->component_id[index])

  1180.                 break;

  1181.         if (index == s->nb_components)

  1182. 	{

  1183. 	    dprintf("decode_sos: index(%d) out of components\n", index);

  1184.             return -1;

  1185. 	}

  1186. 

  1187.         comp_index[i] = index;

  1188. 

  1189.         nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1190.         h_count[i] = s->h_count[index];

  1191.         v_count[i] = s->v_count[index];

  1192. 

  1193.         dc_index[i] = get_bits(&s->gb, 4);

  1194.         ac_index[i] = get_bits(&s->gb, 4);

  1195. 

  1196. 	if (dc_index[i] < 0 || ac_index[i] < 0 ||

  1197. 	    dc_index[i] >= 4 || ac_index[i] >= 4)

  1198. 	    goto out_of_range;

  1199. 	switch(s->start_code)

  1200. 	{

  1201. 	    case SOF0:

  1202. 		if (dc_index[i] > 1 || ac_index[i] > 1)

  1203. 		    goto out_of_range;

  1204. 		break;

  1205. 	    case SOF1:

  1206. 	    case SOF2:

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

  1208. 		    goto out_of_range;

  1209. 		break;

  1210. 	    case SOF3:

  1211. 		if (dc_index[i] > 3 || ac_index[i] != 0)

  1212. 		    goto out_of_range;

  1213. 		break;	

  1214. 	}

  1215.     }

  1216. 

  1217.     predictor= get_bits(&s->gb, 8); /* lossless predictor or start of spectral (Ss) */

  1218.     skip_bits(&s->gb, 8); /* Se */

  1219.     skip_bits(&s->gb, 4); /* Ah */

  1220.     point_transform= get_bits(&s->gb, 4); /* Al */

  1221. 

  1222.     for(i=0;i<nb_components;i++) 

  1223.         s->last_dc[i] = 1024;

  1224. 

  1225.     if (nb_components > 1) {

  1226.         /* interleaved stream */

  1227.         mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);

  1228.         mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);

  1229.     } else {

  1230.         h = s->h_max / s->h_count[comp_index[0]];

  1231.         v = s->v_max / s->v_count[comp_index[0]];

  1232.         mb_width  = (s->width  + h * block_size - 1) / (h * block_size);

  1233.         mb_height = (s->height + v * block_size - 1) / (v * block_size);

  1234.         nb_blocks[0] = 1;

  1235.         h_count[0] = 1;

  1236.         v_count[0] = 1;

  1237.     }

  1238. 

  1239.     if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1240.         printf("%s %s p:%d >>:%d\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "", predictor, point_transform);

  1241.     

  1242.     if(s->lossless){

  1243.         if(s->rgb){

  1244.             uint16_t buffer[2048][4];

  1245.             int left[3], top[3], topleft[3];

  1246.             const int linesize= s->linesize[0];

  1247.             const int mask= (1<<s->bits)-1;

  1248.             

  1249.             for(i=0; i<3; i++){

  1250.                 buffer[0][i]= 1 << (s->bits + point_transform - 1);

  1251.             }

  1252.             for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1253.                 const int modified_predictor= mb_y ? 1 : predictor;

  1254.                 uint8_t *ptr = s->current_picture[0] + (linesize * mb_y);

  1255. 

  1256.                 if (s->interlaced && s->bottom_field)

  1257.                     ptr += linesize >> 1;

  1258. 

  1259.                 for(i=0; i<3; i++){

  1260.                     top[i]= left[i]= topleft[i]= buffer[0][i];

  1261.                 }

  1262.                 for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1263.                     if (s->restart_interval && !s->restart_count)

  1264.                         s->restart_count = s->restart_interval;

  1265. 

  1266.                     for(i=0;i<3;i++) {

  1267.                         int pred;

  1268. 

  1269.                         topleft[i]= top[i];

  1270.                         top[i]= buffer[mb_x][i];

  1271. 

  1272.                         PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);

  1273.                         

  1274.                         left[i]= 

  1275.                         buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform));

  1276.                     }

  1277. 

  1278.                     if (s->restart_interval && !--s->restart_count) {

  1279.                         align_get_bits(&s->gb);

  1280.                         skip_bits(&s->gb, 16); /* skip RSTn */

  1281.                     }

  1282.                 }

  1283. 

  1284.                 if(s->rct){

  1285.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1286.                         ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);

  1287.                         ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];

  1288.                         ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];

  1289.                     }

  1290.                 }else if(s->pegasus_rct){

  1291.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1292.                         ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);

  1293.                         ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];

  1294.                         ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];

  1295.                     }

  1296.                 }else{

  1297.                     for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1298.                         ptr[4*mb_x+0] = buffer[mb_x][0];

  1299.                         ptr[4*mb_x+1] = buffer[mb_x][1];

  1300.                         ptr[4*mb_x+2] = buffer[mb_x][2];

  1301.                     }

  1302.                 }

  1303.             }

  1304.         }else{

  1305.             for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1306.                 for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1307.                     if (s->restart_interval && !s->restart_count)

  1308.                         s->restart_count = s->restart_interval;

  1309. 

  1310.                     if(mb_x==0 || mb_y==0 || s->interlaced){

  1311.                         for(i=0;i<nb_components;i++) {

  1312.                             uint8_t *ptr;

  1313.                             int x, y, c, linesize;

  1314.                             n = nb_blocks[i];

  1315.                             c = comp_index[i];

  1316.                             h = h_count[i];

  1317.                             v = v_count[i];

  1318.                             x = 0;

  1319.                             y = 0;

  1320.                             linesize= s->linesize[c];

  1321.                             

  1322.                             for(j=0; j<n; j++) {

  1323.                                 int pred;

  1324. 

  1325.                                 ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1326.                                 if(y==0 && mb_y==0){

  1327.                                     if(x==0 && mb_x==0){

  1328.                                         pred= 128 << point_transform;

  1329.                                     }else{

  1330.                                         pred= ptr[-1];

  1331.                                     }

  1332.                                 }else{

  1333.                                     if(x==0 && mb_x==0){

  1334.                                         pred= ptr[-linesize];

  1335.                                     }else{

  1336.                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1337.                                     }

  1338.                                 }

  1339.                                 

  1340.                                 if (s->interlaced && s->bottom_field)

  1341.                                     ptr += linesize >> 1;

  1342.                                 *ptr= pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform);

  1343. 

  1344.                                 if (++x == h) {

  1345.                                     x = 0;

  1346.                                     y++;

  1347.                                 }

  1348.                             }

  1349.                         }

  1350.                     }else{

  1351.                         for(i=0;i<nb_components;i++) {

  1352.                             uint8_t *ptr;

  1353.                             int x, y, c, linesize;

  1354.                             n = nb_blocks[i];

  1355.                             c = comp_index[i];

  1356.                             h = h_count[i];

  1357.                             v = v_count[i];

  1358.                             x = 0;

  1359.                             y = 0;

  1360.                             linesize= s->linesize[c];

  1361.                             

  1362.                             for(j=0; j<n; j++) {

  1363.                                 int pred;

  1364. 

  1365.                                 ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1366.                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1367.                                 *ptr= pred + (mjpeg_decode_dc(s, dc_index[i]) << point_transform);

  1368.                                 if (++x == h) {

  1369.                                     x = 0;

  1370.                                     y++;

  1371.                                 }

  1372.                             }

  1373.                         }

  1374.                     }

  1375.                     if (s->restart_interval && !--s->restart_count) {

  1376.                         align_get_bits(&s->gb);

  1377.                         skip_bits(&s->gb, 16); /* skip RSTn */

  1378.                     }

  1379.                 }

  1380.             }

  1381.         }

  1382.     }else{

  1383.       for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1384.         for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1385.             if (s->restart_interval && !s->restart_count)

  1386.                 s->restart_count = s->restart_interval;

  1387. 

  1388.             for(i=0;i<nb_components;i++) {

  1389.                 uint8_t *ptr;

  1390.                 int x, y, c;

  1391.                 n = nb_blocks[i];

  1392.                 c = comp_index[i];

  1393.                 h = h_count[i];

  1394.                 v = v_count[i];

  1395.                 x = 0;

  1396.                 y = 0;

  1397.                 for(j=0;j<n;j++) {

  1398.                     memset(s->block, 0, sizeof(s->block));

  1399.                     if (decode_block(s, s->block, i, 

  1400.                                      dc_index[i], ac_index[i], 

  1401.                                      s->quant_index[c]) < 0) {

  1402.                         dprintf("error y=%d x=%d\n", mb_y, mb_x);

  1403.                         ret = -1;

  1404.                         goto the_end;

  1405.                     }

  1406. //		    dprintf("mb: %d %d processed\n", mb_y, mb_x);

  1407.                     ptr = s->current_picture[c] + 

  1408.                         (s->linesize[c] * (v * mb_y + y) * 8) + 

  1409.                         (h * mb_x + x) * 8;

  1410.                     if (s->interlaced && s->bottom_field)

  1411.                         ptr += s->linesize[c] >> 1;

  1412.                     s->idct_put(ptr, s->linesize[c], s->block);

  1413.                     if (++x == h) {

  1414.                         x = 0;

  1415.                         y++;

  1416.                     }

  1417.                 }

  1418.             }

  1419. 	    /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

  1420.             if (s->restart_interval && (s->restart_interval < 1350) &&

  1421. 		!--s->restart_count) {

  1422.                 align_get_bits(&s->gb);

  1423.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1424.                 for (j=0; j<nb_components; j++) /* reset dc */

  1425.                     s->last_dc[j] = 1024;

  1426.             }

  1427.         }

  1428.     }

  1429.   }

  1430.     ret = 0;

  1431.  the_end:

  1432.     emms_c();

  1433.     return ret;

  1434.  out_of_range:

  1435.     dprintf("decode_sos: ac/dc index out of range\n");

  1436.     return -1;

  1437. }

  1438. 

  1439. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1440. {

  1441.     if (get_bits(&s->gb, 16) != 4)

  1442. 	return -1;

  1443.     s->restart_interval = get_bits(&s->gb, 16);

  1444.     dprintf("restart interval: %d\n", s->restart_interval);

  1445. 

  1446.     return 0;

  1447. }

  1448. 

  1449. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1450. {

  1451.     int len, id;

  1452. 

  1453.     /* XXX: verify len field validity */

  1454.     len = get_bits(&s->gb, 16);

  1455.     if (len < 5)

  1456. 	return -1;

  1457. 

  1458.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1459.     id = be2me_32(id);

  1460.     len -= 6;

  1461. 

  1462.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1463.         printf("APPx %8X\n", id); 

  1464.     }

  1465.     

  1466.     /* buggy AVID, it puts EOI only at every 10th frame */

  1467.     /* also this fourcc is used by non-avid files too, it holds some

  1468.        informations, but it's always present in AVID creates files */

  1469.     if (id == ff_get_fourcc("AVI1"))

  1470.     {

  1471. 	/* structure:

  1472. 	    4bytes	AVI1

  1473. 	    1bytes	polarity

  1474. 	    1bytes	always zero

  1475. 	    4bytes	field_size

  1476. 	    4bytes	field_size_less_padding

  1477. 	*/

  1478.     	s->buggy_avid = 1;

  1479. //	if (s->first_picture)

  1480. //	    printf("mjpeg: workarounding buggy AVID\n");

  1481. 	s->interlace_polarity = get_bits(&s->gb, 8);

  1482. #if 0

  1483. 	skip_bits(&s->gb, 8);

  1484. 	skip_bits(&s->gb, 32);

  1485. 	skip_bits(&s->gb, 32);

  1486. 	len -= 10;

  1487. #endif

  1488. //	if (s->interlace_polarity)

  1489. //	    printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1490. 	goto out;

  1491.     }

  1492.     

  1493. //    len -= 2;

  1494.     

  1495.     if (id == ff_get_fourcc("JFIF"))

  1496.     {

  1497. 	int t_w, t_h;

  1498. 	skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1499. 	printf("mjpeg: JFIF header found (version: %x.%x)\n",

  1500. 	    get_bits(&s->gb, 8), get_bits(&s->gb, 8));

  1501. 	if (get_bits(&s->gb, 8) == 0)

  1502. 	{

  1503. 	    int x_density, y_density; 

  1504. 	    x_density = get_bits(&s->gb, 16);

  1505. 	    y_density = get_bits(&s->gb, 16);

  1506. 

  1507. 	    dprintf("x/y density: %d (%f), %d (%f)\n", x_density,

  1508. 		(float)x_density, y_density, (float)y_density);

  1509. #if 0

  1510.             //MN: needs to be checked

  1511.             if(x_density)

  1512. //                s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);

  1513. 		s->avctx->aspect_ratio = (float)x_density/y_density;

  1514. 		/* it's better, but every JFIF I have seen stores 1:1 */

  1515.             else

  1516.                 s->avctx->aspect_ratio= 0.0;

  1517. #endif

  1518. 	}

  1519. 	else

  1520. 	{

  1521. 	    skip_bits(&s->gb, 16);

  1522. 	    skip_bits(&s->gb, 16);

  1523. 	}

  1524. 

  1525. 	t_w = get_bits(&s->gb, 8);

  1526. 	t_h = get_bits(&s->gb, 8);

  1527. 	if (t_w && t_h)

  1528. 	{

  1529. 	    /* skip thumbnail */

  1530. 	    if (len-10-(t_w*t_h*3) > 0)

  1531. 		len -= t_w*t_h*3;

  1532. 	}

  1533. 	len -= 10;

  1534. 	goto out;

  1535.     }

  1536.     

  1537.     if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1538.     {

  1539. 	printf("mjpeg: Adobe header found\n");

  1540. 	skip_bits(&s->gb, 16); /* version */

  1541. 	skip_bits(&s->gb, 16); /* flags0 */

  1542. 	skip_bits(&s->gb, 16); /* flags1 */

  1543. 	skip_bits(&s->gb, 8); /* transform */

  1544. 	len -= 7;

  1545. 	goto out;

  1546.     }

  1547. 

  1548.     if (id == ff_get_fourcc("LJIF")){

  1549.         printf("Pegasus lossless jpeg header found\n");

  1550. 	skip_bits(&s->gb, 16); /* version ? */

  1551. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1552. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1553. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1554.         switch( get_bits(&s->gb, 8)){

  1555.         case 1:

  1556.             s->rgb= 1;

  1557.             s->pegasus_rct=0;

  1558.             break;

  1559.         case 2:

  1560.             s->rgb= 1;

  1561.             s->pegasus_rct=1;

  1562.             break;

  1563.         default:

  1564.             printf("unknown colorspace\n");

  1565.         }

  1566.         len -= 9;

  1567.         goto out;

  1568.     }

  1569.     

  1570.     /* Apple MJPEG-A */

  1571.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1572.     {

  1573. 	id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1574. 	id = be2me_32(id);

  1575. 	len -= 4;

  1576. 	if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */

  1577. 	{

  1578. #if 0

  1579. 	    skip_bits(&s->gb, 32); /* field size */

  1580. 	    skip_bits(&s->gb, 32); /* pad field size */

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

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

  1583. 	    skip_bits(&s->gb, 32); /* huff off */

  1584. 	    skip_bits(&s->gb, 32); /* image off */

  1585. 	    skip_bits(&s->gb, 32); /* scan off */

  1586. 	    skip_bits(&s->gb, 32); /* data off */

  1587. #endif

  1588. 	    if (s->first_picture)

  1589. 		printf("mjpeg: Apple MJPEG-A header found\n");

  1590. 	}

  1591.     }

  1592. 

  1593. out:

  1594.     /* slow but needed for extreme adobe jpegs */

  1595.     if (len < 0)

  1596. 	printf("mjpeg: error, decode_app parser read over the end\n");

  1597.     while(--len > 0)

  1598. 	skip_bits(&s->gb, 8);

  1599. 

  1600.     return 0;

  1601. }

  1602. 

  1603. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1604. {

  1605.     /* XXX: verify len field validity */

  1606.     int len = get_bits(&s->gb, 16);

  1607.     if (len >= 2 && len < 32768) {

  1608. 	/* XXX: any better upper bound */

  1609. 	uint8_t *cbuf = av_malloc(len - 1);

  1610. 	if (cbuf) {

  1611. 	    int i;

  1612. 	    for (i = 0; i < len - 2; i++)

  1613. 		cbuf[i] = get_bits(&s->gb, 8);

  1614. 	    if (i > 0 && cbuf[i-1] == '\n')

  1615. 		cbuf[i-1] = 0;

  1616. 	    else

  1617. 		cbuf[i] = 0;

  1618. 

  1619. 	    printf("mjpeg comment: '%s'\n", cbuf);

  1620. 

  1621. 	    /* buggy avid, it puts EOI only at every 10th frame */

  1622. 	    if (!strcmp(cbuf, "AVID"))

  1623. 	    {

  1624. 		s->buggy_avid = 1;

  1625. 		//	if (s->first_picture)

  1626. 		//	    printf("mjpeg: workarounding buggy AVID\n");

  1627. 	    }

  1628. 

  1629. 	    av_free(cbuf);

  1630. 	}

  1631.     }

  1632. 

  1633.     return 0;

  1634. }

  1635. 

  1636. #if 0

  1637. static int valid_marker_list[] =

  1638. {

  1639.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

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

  1641. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1642. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1643. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1644. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1645. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1646. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1647. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1648. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1649. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1650. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1651. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1652. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1653. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1654. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1655. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1656. }

  1657. #endif

  1658. 

  1659. /* return the 8 bit start code value and update the search

  1660.    state. Return -1 if no start code found */

  1661. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1662. {

  1663.     uint8_t *buf_ptr;

  1664.     unsigned int v, v2;

  1665.     int val;

  1666. #ifdef DEBUG

  1667.     int skipped=0;

  1668. #endif

  1669. 

  1670.     buf_ptr = *pbuf_ptr;

  1671.     while (buf_ptr < buf_end) {

  1672.         v = *buf_ptr++;

  1673. 	v2 = *buf_ptr;

  1674.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {

  1675. 	    val = *buf_ptr++;

  1676. 	    goto found;

  1677.         }

  1678. #ifdef DEBUG

  1679. 	skipped++;

  1680. #endif

  1681.     }

  1682.     val = -1;

  1683. found:

  1684. #ifdef DEBUG

  1685.     dprintf("find_marker skipped %d bytes\n", skipped);

  1686. #endif

  1687.     *pbuf_ptr = buf_ptr;

  1688.     return val;

  1689. }

  1690. 

  1691. static int mjpeg_decode_frame(AVCodecContext *avctx, 

  1692.                               void *data, int *data_size,

  1693.                               uint8_t *buf, int buf_size)

  1694. {

  1695.     MJpegDecodeContext *s = avctx->priv_data;

  1696.     uint8_t *buf_end, *buf_ptr;

  1697.     int i, start_code;

  1698.     AVPicture *picture = data;

  1699. 

  1700.     *data_size = 0;

  1701. 

  1702.     /* no supplementary picture */

  1703.     if (buf_size == 0)

  1704.         return 0;

  1705. 

  1706.     buf_ptr = buf;

  1707.     buf_end = buf + buf_size;

  1708.     while (buf_ptr < buf_end) {

  1709.         /* find start next marker */

  1710.         start_code = find_marker(&buf_ptr, buf_end);

  1711. 	{

  1712. 	    /* EOF */

  1713.             if (start_code < 0) {

  1714. 		goto the_end;

  1715.             } else {

  1716.                 dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);

  1717. 		

  1718. 		if ((buf_end - buf_ptr) > s->buffer_size)

  1719. 		{

  1720. 		    av_free(s->buffer);

  1721. 		    s->buffer_size = buf_end-buf_ptr;

  1722. 		    s->buffer = av_malloc(s->buffer_size);

  1723. 		    dprintf("buffer too small, expanding to %d bytes\n",

  1724. 			s->buffer_size);

  1725. 		}

  1726. 		

  1727. 		/* unescape buffer of SOS */

  1728. 		if (start_code == SOS)

  1729. 		{

  1730. 		    uint8_t *src = buf_ptr;

  1731. 		    uint8_t *dst = s->buffer;

  1732. 

  1733. 		    while (src<buf_end)

  1734. 		    {

  1735. 			uint8_t x = *(src++);

  1736. 

  1737. 			*(dst++) = x;

  1738. 			if (x == 0xff)

  1739. 			{

  1740. 			    while(*src == 0xff) src++;

  1741. 

  1742. 			    x = *(src++);

  1743. 			    if (x >= 0xd0 && x <= 0xd7)

  1744. 				*(dst++) = x;

  1745. 			    else if (x)

  1746. 				break;

  1747. 			}

  1748. 		    }

  1749. 		    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1750. 		    

  1751. 		    dprintf("escaping removed %d bytes\n",

  1752. 			(buf_end - buf_ptr) - (dst - s->buffer));

  1753. 		}

  1754. 		else

  1755. 		    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1756. 		

  1757. 		s->start_code = start_code;

  1758.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1759.                     printf("startcode: %X\n", start_code);

  1760.                 }

  1761. 

  1762. 		/* process markers */

  1763. 		if (start_code >= 0xd0 && start_code <= 0xd7) {

  1764. 		    dprintf("restart marker: %d\n", start_code&0x0f);

  1765. 		} else if (s->first_picture) {

  1766. 		    /* APP fields */

  1767. 		    if (start_code >= 0xe0 && start_code <= 0xef)

  1768. 			mjpeg_decode_app(s);

  1769. 		    /* Comment */

  1770. 		    else if (start_code == COM)

  1771. 			mjpeg_decode_com(s);

  1772. 		}

  1773. 

  1774.                 switch(start_code) {

  1775.                 case SOI:

  1776. 		    s->restart_interval = 0;

  1777.                     /* nothing to do on SOI */

  1778.                     break;

  1779.                 case DQT:

  1780.                     mjpeg_decode_dqt(s);

  1781.                     break;

  1782.                 case DHT:

  1783.                     if(mjpeg_decode_dht(s) < 0){

  1784.                         fprintf(stderr, "huffman table decode error\n");

  1785.                         return -1;

  1786.                     }

  1787.                     break;

  1788.                 case SOF0:

  1789.                     s->lossless=0;

  1790.                     if (mjpeg_decode_sof(s) < 0) 

  1791. 			return -1;

  1792.                     break;

  1793.                 case SOF3:

  1794.                     s->lossless=1;

  1795.                     if (mjpeg_decode_sof(s) < 0) 

  1796. 			return -1;

  1797.                     break;

  1798. 		case EOI:

  1799. eoi_parser:

  1800. 		    {

  1801.                         if (s->interlaced) {

  1802.                             s->bottom_field ^= 1;

  1803.                             /* if not bottom field, do not output image yet */

  1804.                             if (s->bottom_field)

  1805.                                 goto not_the_end;

  1806.                         }

  1807.                         for(i=0;i<3;i++) {

  1808.                             picture->data[i] = s->current_picture[i];

  1809. 			    picture->linesize[i] = (s->interlaced) ?

  1810. 				s->linesize[i] >> 1 : s->linesize[i];

  1811.                         }

  1812.                         *data_size = sizeof(AVPicture);

  1813.                         avctx->height = s->height;

  1814.                         if (s->interlaced)

  1815.                             avctx->height *= 2;

  1816.                         avctx->width = s->width;

  1817.                         /* XXX: not complete test ! */

  1818.                         switch((s->h_count[0] << 4) | s->v_count[0]) {

  1819.                         case 0x11:

  1820.                             if(s->rgb){

  1821.                                 avctx->pix_fmt = PIX_FMT_RGBA32;

  1822.                             }else

  1823.                                 avctx->pix_fmt = PIX_FMT_YUV444P;

  1824.                             break;

  1825.                         case 0x21:

  1826.                             avctx->pix_fmt = PIX_FMT_YUV422P;

  1827.                             break;

  1828.                         default:

  1829.                         case 0x22:

  1830.                             avctx->pix_fmt = PIX_FMT_YUV420P;

  1831.                             break;

  1832.                         }

  1833.                         /* dummy quality */

  1834.                         /* XXX: infer it with matrix */

  1835. //                    	avctx->quality = 3; 

  1836.                         goto the_end;

  1837.                     }

  1838. 		    break;

  1839.                 case SOS:

  1840.                     mjpeg_decode_sos(s);

  1841. 		    /* buggy avid puts EOI every 10-20th frame */

  1842. 		    /* if restart period is over process EOI */

  1843. 		    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1844. 			goto eoi_parser;

  1845.                     break;

  1846. 		case DRI:

  1847. 		    mjpeg_decode_dri(s);

  1848. 		    break;

  1849. 		case SOF1:

  1850. 		case SOF2:

  1851. 		case SOF5:

  1852. 		case SOF6:

  1853. 		case SOF7:

  1854. 		case SOF9:

  1855. 		case SOF10:

  1856. 		case SOF11:

  1857. 		case SOF13:

  1858. 		case SOF14:

  1859. 		case SOF15:

  1860. 		case JPG:

  1861. 		    printf("mjpeg: unsupported coding type (%x)\n", start_code);

  1862. 		    break;

  1863. //		default:

  1864. //		    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1865. //		    break;

  1866.                 }

  1867. 

  1868. not_the_end:

  1869. 		/* eof process start code */

  1870. 		buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1871. 		dprintf("marker parser used %d bytes (%d bits)\n",

  1872. 		    (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1873.             }

  1874.         }

  1875.     }

  1876. the_end:

  1877.     dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);

  1878. //    return buf_end - buf_ptr;

  1879.     return buf_ptr - buf;

  1880. }

  1881. 

  1882. static int mjpegb_decode_frame(AVCodecContext *avctx, 

  1883.                               void *data, int *data_size,

  1884.                               uint8_t *buf, int buf_size)

  1885. {

  1886.     MJpegDecodeContext *s = avctx->priv_data;

  1887.     uint8_t *buf_end, *buf_ptr;

  1888.     int i;

  1889.     AVPicture *picture = data;

  1890.     GetBitContext hgb; /* for the header */

  1891.     uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

  1892.     uint32_t field_size;

  1893. 

  1894.     *data_size = 0;

  1895. 

  1896.     /* no supplementary picture */

  1897.     if (buf_size == 0)

  1898.         return 0;

  1899. 

  1900.     buf_ptr = buf;

  1901.     buf_end = buf + buf_size;

  1902.     

  1903. read_header:

  1904.     /* reset on every SOI */

  1905.     s->restart_interval = 0;

  1906. 

  1907.     init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);

  1908. 

  1909.     skip_bits(&hgb, 32); /* reserved zeros */

  1910.     

  1911.     if (get_bits(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

  1912.     {

  1913. 	dprintf("not mjpeg-b (bad fourcc)\n");

  1914. 	return 0;

  1915.     }

  1916. 

  1917.     field_size = get_bits(&hgb, 32); /* field size */

  1918.     dprintf("field size: 0x%x\n", field_size);

  1919.     skip_bits(&hgb, 32); /* padded field size */

  1920.     second_field_offs = get_bits(&hgb, 32);

  1921.     dprintf("second field offs: 0x%x\n", second_field_offs);

  1922.     if (second_field_offs)

  1923. 	s->interlaced = 1;

  1924. 

  1925.     dqt_offs = get_bits(&hgb, 32);

  1926.     dprintf("dqt offs: 0x%x\n", dqt_offs);

  1927.     if (dqt_offs)

  1928.     {

  1929. 	init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

  1930. 	s->start_code = DQT;

  1931. 	mjpeg_decode_dqt(s);

  1932.     }

  1933.     

  1934.     dht_offs = get_bits(&hgb, 32);

  1935.     dprintf("dht offs: 0x%x\n", dht_offs);

  1936.     if (dht_offs)

  1937.     {

  1938. 	init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

  1939. 	s->start_code = DHT;

  1940. 	mjpeg_decode_dht(s);

  1941.     }

  1942. 

  1943.     sof_offs = get_bits(&hgb, 32);

  1944.     dprintf("sof offs: 0x%x\n", sof_offs);

  1945.     if (sof_offs)

  1946.     {

  1947. 	init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

  1948. 	s->start_code = SOF0;

  1949. 	if (mjpeg_decode_sof(s) < 0)

  1950. 	    return -1;

  1951.     }

  1952. 

  1953.     sos_offs = get_bits(&hgb, 32);

  1954.     dprintf("sos offs: 0x%x\n", sos_offs);

  1955.     if (sos_offs)

  1956.     {

  1957. //	init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);

  1958. 	init_get_bits(&s->gb, buf+sos_offs, field_size*8);

  1959. 	s->start_code = SOS;

  1960. 	mjpeg_decode_sos(s);

  1961.     }

  1962. 

  1963.     skip_bits(&hgb, 32); /* start of data offset */

  1964. 

  1965.     if (s->interlaced) {

  1966.         s->bottom_field ^= 1;

  1967.         /* if not bottom field, do not output image yet */

  1968.         if (s->bottom_field && second_field_offs)

  1969. 	{

  1970. 	    buf_ptr = buf + second_field_offs;

  1971. 	    second_field_offs = 0;

  1972. 	    goto read_header;

  1973.     	}

  1974.     }

  1975. 

  1976.     for(i=0;i<3;i++) {

  1977.         picture->data[i] = s->current_picture[i];

  1978.         picture->linesize[i] = (s->interlaced) ?

  1979.     	    s->linesize[i] >> 1 : s->linesize[i];

  1980.     }

  1981.     *data_size = sizeof(AVPicture);

  1982.     avctx->height = s->height;

  1983.     if (s->interlaced)

  1984.         avctx->height *= 2;

  1985.     avctx->width = s->width;

  1986.     /* XXX: not complete test ! */

  1987.     switch((s->h_count[0] << 4) | s->v_count[0]) {

  1988.         case 0x11:

  1989.     	    avctx->pix_fmt = PIX_FMT_YUV444P;

  1990.             break;

  1991.         case 0x21:

  1992.             avctx->pix_fmt = PIX_FMT_YUV422P;

  1993.             break;

  1994.         default:

  1995. 	case 0x22:

  1996.             avctx->pix_fmt = PIX_FMT_YUV420P;

  1997.             break;

  1998.     }

  1999.     /* dummy quality */

  2000.     /* XXX: infer it with matrix */

  2001. //    avctx->quality = 3; 

  2002. 

  2003.     return buf_ptr - buf;

  2004. }

  2005. 

  2006. 

  2007. static int mjpeg_decode_end(AVCodecContext *avctx)

  2008. {

  2009.     MJpegDecodeContext *s = avctx->priv_data;

  2010.     int i, j;

  2011. 

  2012.     av_free(s->buffer);

  2013.     for(i=0;i<MAX_COMPONENTS;i++)

  2014.         av_free(s->current_picture[i]);

  2015.     for(i=0;i<2;i++) {

  2016.         for(j=0;j<4;j++)

  2017.             free_vlc(&s->vlcs[i][j]);

  2018.     }

  2019.     return 0;

  2020. }

  2021. 

  2022. AVCodec mjpeg_decoder = {

  2023.     "mjpeg",

  2024.     CODEC_TYPE_VIDEO,

  2025.     CODEC_ID_MJPEG,

  2026.     sizeof(MJpegDecodeContext),

  2027.     mjpeg_decode_init,

  2028.     NULL,

  2029.     mjpeg_decode_end,

  2030.     mjpeg_decode_frame,

  2031.     0,

  2032.     NULL

  2033. };

  2034. 

  2035. AVCodec mjpegb_decoder = {

  2036.     "mjpegb",

  2037.     CODEC_TYPE_VIDEO,

  2038.     CODEC_ID_MJPEGB,

  2039.     sizeof(MJpegDecodeContext),

  2040.     mjpeg_decode_init,

  2041.     NULL,

  2042.     mjpeg_decode_end,

  2043.     mjpegb_decode_frame,

  2044.     0,

  2045.     NULL

  2046. };

  2047. 

  2048. #ifdef CONFIG_ENCODERS

  2049. AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them

  2050.     "ljpeg",

  2051.     CODEC_TYPE_VIDEO,

  2052.     CODEC_ID_LJPEG,

  2053.     sizeof(MpegEncContext),

  2054.     MPV_encode_init,

  2055.     encode_picture_lossless,

  2056.     MPV_encode_end,

  2057. };

  2058. #endif