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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 ? predictor : 1;

  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.     int qscale[4];      ///< quantizer scale calculated from quant_matrixes

  812. 

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

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

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

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

  817.     int lossless;

  818.     int rgb;

  819.     int rct;            /* standard rct */  

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

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

  822. 

  823.     int width, height;

  824.     int mb_width, mb_height;

  825.     int nb_components;

  826.     int component_id[MAX_COMPONENTS];

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

  828.     int v_count[MAX_COMPONENTS];

  829.     int comp_index[MAX_COMPONENTS];

  830.     int dc_index[MAX_COMPONENTS];

  831.     int ac_index[MAX_COMPONENTS];

  832.     int nb_blocks[MAX_COMPONENTS];

  833.     int h_scount[MAX_COMPONENTS];

  834.     int v_scount[MAX_COMPONENTS];

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

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

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

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

  839.     int linesize[MAX_COMPONENTS];

  840.     uint8_t *qscale_table;

  841.     DCTELEM block[64] __align8;

  842.     ScanTable scantable;

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

  844. 

  845.     int restart_interval;

  846.     int restart_count;

  847. 

  848.     int buggy_avid;

  849.     int interlace_polarity;

  850. } MJpegDecodeContext;

  851. 

  852. static int mjpeg_decode_dht(MJpegDecodeContext *s);

  853. 

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

  855.                       int nb_codes)

  856. {

  857.     uint8_t huff_size[256];

  858.     uint16_t huff_code[256];

  859. 

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

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

  862.     

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

  864. }

  865. 

  866. static int mjpeg_decode_init(AVCodecContext *avctx)

  867. {

  868.     MJpegDecodeContext *s = avctx->priv_data;

  869.     MpegEncContext s2;

  870. 

  871.     s->avctx = avctx;

  872. 

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

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

  875.     s2.flags= avctx->flags;

  876.     s2.avctx= avctx;

  877. //    s2->out_format = FMT_MJPEG;

  878.     s2.width = 8;

  879.     s2.height = 8;

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

  881.        return -1;

  882.     s->scantable= s2.intra_scantable;

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

  884.     MPV_common_end(&s2);

  885. 

  886.     s->mpeg_enc_ctx_allocated = 0;

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

  888. 				but photojpg files could ahive bigger sizes */

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

  890.     if (!s->buffer)

  891. 	return -1;

  892.     s->start_code = -1;

  893.     s->first_picture = 1;

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

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

  896.     

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

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

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

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

  901. 

  902.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  903.     {

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

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

  906. 	mjpeg_decode_dht(s);

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

  908.     }

  909. 

  910.     return 0;

  911. }

  912. 

  913. /* quantize tables */

  914. static int mjpeg_decode_dqt(MJpegDecodeContext *s)

  915. {

  916.     int len, index, i, j;

  917.     

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

  919. 

  920.     while (len >= 65) {

  921.         /* only 8 bit precision handled */

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

  923. 	{

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

  925.             return -1;

  926. 	}

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

  928.         if (index >= 4)

  929.             return -1;

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

  931.         /* read quant table */

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

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

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

  935.         }

  936. 

  937.         //XXX FIXME finetune, and perhaps add dc too

  938.         s->qscale[index]= FFMAX(

  939.             s->quant_matrixes[index][s->scantable.permutated[1]],

  940.             s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;

  941.         len -= 65;

  942.     }

  943.     

  944.     return 0;

  945. }

  946. 

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

  948. static int mjpeg_decode_dht(MJpegDecodeContext *s)

  949. {

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

  951.     uint8_t bits_table[17];

  952.     uint8_t val_table[256];

  953.     

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

  955. 

  956.     while (len > 0) {

  957.         if (len < 17)

  958.             return -1;

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

  960.         if (class >= 2)

  961.             return -1;

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

  963.         if (index >= 4)

  964.             return -1;

  965.         n = 0;

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

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

  968.             n += bits_table[i];

  969.         }

  970.         len -= 17;

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

  972.             return -1;

  973. 

  974.         code_max = 0;

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

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

  977.             if (v > code_max)

  978.                 code_max = v;

  979.             val_table[i] = v;

  980.         }

  981.         len -= n;

  982. 

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

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

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

  986.                class, index, code_max + 1);

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

  988.             return -1;

  989.         }

  990.     }

  991.     return 0;

  992. }

  993. 

  994. static int mjpeg_decode_sof(MJpegDecodeContext *s)

  995. {

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

  997. 

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

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

  1000.     s->bits= get_bits(&s->gb, 8);

  1001.     

  1002.     if(s->pegasus_rct) s->bits=9;  

  1003.     if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly

  1004. 

  1005.     if (s->bits != 8 && !s->lossless){

  1006.         printf("only 8 bits/component accepted\n");

  1007.         return -1;

  1008.     }

  1009.     height = get_bits(&s->gb, 16);

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

  1011.     dprintf("sof0: picture: %dx%d\n", width, height);

  1012. 

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

  1014.     if (nb_components <= 0 ||

  1015.         nb_components > MAX_COMPONENTS)

  1016.         return -1;

  1017.     s->nb_components = nb_components;

  1018.     s->h_max = 1;

  1019.     s->v_max = 1;

  1020.     for(i=0;i<nb_components;i++) {

  1021.         /* component id */

  1022.         s->component_id[i] = get_bits(&s->gb, 8) - 1;

  1023.         s->h_count[i] = get_bits(&s->gb, 4);

  1024.         s->v_count[i] = get_bits(&s->gb, 4);

  1025.         /* compute hmax and vmax (only used in interleaved case) */

  1026.         if (s->h_count[i] > s->h_max)

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

  1028.         if (s->v_count[i] > s->v_max)

  1029.             s->v_max = s->v_count[i];

  1030.         s->quant_index[i] = get_bits(&s->gb, 8);

  1031.         if (s->quant_index[i] >= 4)

  1032.             return -1;

  1033.         dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],

  1034. 	    s->v_count[i], s->component_id[i], s->quant_index[i]);

  1035.     }

  1036.     

  1037.     if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;

  1038. 

  1039.     /* if different size, realloc/alloc picture */

  1040.     /* XXX: also check h_count and v_count */

  1041.     if (width != s->width || height != s->height) {

  1042.         for(i=0;i<MAX_COMPONENTS;i++)

  1043.             av_freep(&s->current_picture[i]);

  1044.             

  1045.         av_freep(&s->qscale_table);

  1046.             

  1047.         s->width = width;

  1048.         s->height = height;

  1049.         /* test interlaced mode */

  1050.         if (s->first_picture &&

  1051.             s->org_height != 0 &&

  1052.             s->height < ((s->org_height * 3) / 4)) {

  1053.             s->interlaced = 1;

  1054. //	    s->bottom_field = (s->interlace_polarity) ? 1 : 0;

  1055. 	    s->bottom_field = 0;

  1056.         }

  1057. 

  1058.         if(s->rgb){

  1059.             int w, h;

  1060.             w = s->width;

  1061.             h = s->height;

  1062.             if (s->interlaced)

  1063.                 w *= 2;

  1064.             s->linesize[0] = 4*w;

  1065.             s->current_picture[0] = av_mallocz(4*w * h);

  1066.             s->current_picture[1] = s->current_picture[2] = NULL;

  1067.         }else{

  1068.           for(i=0;i<nb_components;i++) {

  1069.             int w, h;

  1070.             w = (s->width  + 8 * s->h_max - 1) / (8 * s->h_max);

  1071.             h = (s->height + 8 * s->v_max - 1) / (8 * s->v_max);

  1072.             w = w * 8 * s->h_count[i];

  1073.             h = h * 8 * s->v_count[i];

  1074.             if (s->interlaced)

  1075.                 w *= 2;

  1076.             s->linesize[i] = w;

  1077.             s->current_picture[i] = av_mallocz(w * h);

  1078. 	    if (!s->current_picture[i])

  1079. 	    {

  1080. 		dprintf("error: no picture buffers allocated\n");

  1081. 		return -1;

  1082. 	    }

  1083.           }

  1084.         }

  1085.         s->qscale_table= av_mallocz((s->width+15)/16);

  1086. 

  1087.         s->first_picture = 0;

  1088.     }

  1089. 

  1090.     if (len != (8+(3*nb_components)))

  1091.     {

  1092. 	dprintf("decode_sof0: error, len(%d) mismatch\n", len);

  1093.     }

  1094.     

  1095.     return 0;

  1096. }

  1097. 

  1098. static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)

  1099. {

  1100.     int code;

  1101.     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);

  1102.     if (code < 0)

  1103.     {

  1104. 	dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,

  1105.                 &s->vlcs[0][dc_index]);

  1106.         return 0xffff;

  1107.     }

  1108. 

  1109.     if(code)

  1110.         return get_xbits(&s->gb, code);

  1111.     else

  1112.         return 0;

  1113. }

  1114. 

  1115. /* decode block and dequantize */

  1116. static int decode_block(MJpegDecodeContext *s, DCTELEM *block, 

  1117.                         int component, int dc_index, int ac_index, int quant_index)

  1118. {

  1119.     int code, i, j, level, val;

  1120.     VLC *ac_vlc;

  1121.     int16_t *quant_matrix;

  1122. 

  1123.     /* DC coef */

  1124.     val = mjpeg_decode_dc(s, dc_index);

  1125.     if (val == 0xffff) {

  1126.         dprintf("error dc\n");

  1127.         return -1;

  1128.     }

  1129.     quant_matrix = s->quant_matrixes[quant_index];

  1130.     val = val * quant_matrix[0] + s->last_dc[component];

  1131.     s->last_dc[component] = val;

  1132.     block[0] = val;

  1133.     /* AC coefs */

  1134.     ac_vlc = &s->vlcs[1][ac_index];

  1135.     i = 1;

  1136.     for(;;) {

  1137. 	code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table, 9, 2);

  1138. 

  1139.         if (code < 0) {

  1140.             dprintf("error ac\n");

  1141.             return -1;

  1142.         }

  1143.         /* EOB */

  1144.         if (code == 0)

  1145.             break;

  1146.         if (code == 0xf0) {

  1147.             i += 16;

  1148.         } else {

  1149.             level = get_xbits(&s->gb, code & 0xf);

  1150.             i += code >> 4;

  1151.             if (i >= 64) {

  1152.                 dprintf("error count: %d\n", i);

  1153.                 return -1;

  1154.             }

  1155.             j = s->scantable.permutated[i];

  1156.             block[j] = level * quant_matrix[j];

  1157.             i++;

  1158.             if (i >= 64)

  1159.                 break;

  1160.         }

  1161.     }

  1162.     return 0;

  1163. }

  1164. 

  1165. static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){

  1166.     int i, mb_x, mb_y;

  1167.     uint16_t buffer[2048][4];

  1168.     int left[3], top[3], topleft[3];

  1169.     const int linesize= s->linesize[0];

  1170.     const int mask= (1<<s->bits)-1;

  1171.     

  1172.     for(i=0; i<3; i++){

  1173.         buffer[0][i]= 1 << (s->bits + point_transform - 1);

  1174.     }

  1175.     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1176.         const int modified_predictor= mb_y ? predictor : 1;

  1177.         uint8_t *ptr = s->current_picture[0] + (linesize * mb_y);

  1178. 

  1179.         if (s->interlaced && s->bottom_field)

  1180.             ptr += linesize >> 1;

  1181. 

  1182.         for(i=0; i<3; i++){

  1183.             top[i]= left[i]= topleft[i]= buffer[0][i];

  1184.         }

  1185.         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1186.             if (s->restart_interval && !s->restart_count)

  1187.                 s->restart_count = s->restart_interval;

  1188. 

  1189.             for(i=0;i<3;i++) {

  1190.                 int pred;

  1191. 

  1192.                 topleft[i]= top[i];

  1193.                 top[i]= buffer[mb_x][i];

  1194. 

  1195.                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);

  1196.                 

  1197.                 left[i]= 

  1198.                 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));

  1199.             }

  1200. 

  1201.             if (s->restart_interval && !--s->restart_count) {

  1202.                 align_get_bits(&s->gb);

  1203.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1204.             }

  1205.         }

  1206. 

  1207.         if(s->rct){

  1208.             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1209.                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);

  1210.                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];

  1211.                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];

  1212.             }

  1213.         }else if(s->pegasus_rct){

  1214.             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1215.                 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);

  1216.                 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];

  1217.                 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];

  1218.             }

  1219.         }else{

  1220.             for(mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1221.                 ptr[4*mb_x+0] = buffer[mb_x][0];

  1222.                 ptr[4*mb_x+1] = buffer[mb_x][1];

  1223.                 ptr[4*mb_x+2] = buffer[mb_x][2];

  1224.             }

  1225.         }

  1226.     }

  1227.     return 0;

  1228. }

  1229. 

  1230. static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){

  1231.     int i, mb_x, mb_y;

  1232.     const int nb_components=3;

  1233. 

  1234.     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1235.         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1236.             if (s->restart_interval && !s->restart_count)

  1237.                 s->restart_count = s->restart_interval;

  1238. 

  1239.             if(mb_x==0 || mb_y==0 || s->interlaced){

  1240.                 for(i=0;i<nb_components;i++) {

  1241.                     uint8_t *ptr;

  1242.                     int n, h, v, x, y, c, j, linesize;

  1243.                     n = s->nb_blocks[i];

  1244.                     c = s->comp_index[i];

  1245.                     h = s->h_scount[i];

  1246.                     v = s->v_scount[i];

  1247.                     x = 0;

  1248.                     y = 0;

  1249.                     linesize= s->linesize[c];

  1250.                     

  1251.                     for(j=0; j<n; j++) {

  1252.                         int pred;

  1253. 

  1254.                         ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1255.                         if(y==0 && mb_y==0){

  1256.                             if(x==0 && mb_x==0){

  1257.                                 pred= 128 << point_transform;

  1258.                             }else{

  1259.                                 pred= ptr[-1];

  1260.                             }

  1261.                         }else{

  1262.                             if(x==0 && mb_x==0){

  1263.                                 pred= ptr[-linesize];

  1264.                             }else{

  1265.                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1266.                             }

  1267.                         }

  1268.                         

  1269.                         if (s->interlaced && s->bottom_field)

  1270.                             ptr += linesize >> 1;

  1271.                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);

  1272. 

  1273.                         if (++x == h) {

  1274.                             x = 0;

  1275.                             y++;

  1276.                         }

  1277.                     }

  1278.                 }

  1279.             }else{

  1280.                 for(i=0;i<nb_components;i++) {

  1281.                     uint8_t *ptr;

  1282.                     int n, h, v, x, y, c, j, linesize;

  1283.                     n = s->nb_blocks[i];

  1284.                     c = s->comp_index[i];

  1285.                     h = s->h_scount[i];

  1286.                     v = s->v_scount[i];

  1287.                     x = 0;

  1288.                     y = 0;

  1289.                     linesize= s->linesize[c];

  1290.                     

  1291.                     for(j=0; j<n; j++) {

  1292.                         int pred;

  1293. 

  1294.                         ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap

  1295.                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);

  1296.                         *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);

  1297.                         if (++x == h) {

  1298.                             x = 0;

  1299.                             y++;

  1300.                         }

  1301.                     }

  1302.                 }

  1303.             }

  1304.             if (s->restart_interval && !--s->restart_count) {

  1305.                 align_get_bits(&s->gb);

  1306.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1307.             }

  1308.         }

  1309.     }

  1310.     return 0;

  1311. }

  1312. 

  1313. static int mjpeg_decode_scan(MJpegDecodeContext *s){

  1314.     int i, mb_x, mb_y;

  1315.     const int nb_components=3;

  1316. 

  1317.     for(mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1318.         for(mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1319.             if (s->restart_interval && !s->restart_count)

  1320.                 s->restart_count = s->restart_interval;

  1321. 

  1322.             for(i=0;i<nb_components;i++) {

  1323.                 uint8_t *ptr;

  1324.                 int n, h, v, x, y, c, j;

  1325.                 n = s->nb_blocks[i];

  1326.                 c = s->comp_index[i];

  1327.                 h = s->h_scount[i];

  1328.                 v = s->v_scount[i];

  1329.                 x = 0;

  1330.                 y = 0;

  1331.                 for(j=0;j<n;j++) {

  1332.                     memset(s->block, 0, sizeof(s->block));

  1333.                     if (decode_block(s, s->block, i, 

  1334.                                      s->dc_index[i], s->ac_index[i], 

  1335.                                      s->quant_index[c]) < 0) {

  1336.                         dprintf("error y=%d x=%d\n", mb_y, mb_x);

  1337.                         return -1;

  1338.                     }

  1339. //		    dprintf("mb: %d %d processed\n", mb_y, mb_x);

  1340.                     ptr = s->current_picture[c] + 

  1341.                         (s->linesize[c] * (v * mb_y + y) * 8) + 

  1342.                         (h * mb_x + x) * 8;

  1343.                     if (s->interlaced && s->bottom_field)

  1344.                         ptr += s->linesize[c] >> 1;

  1345.                     s->idct_put(ptr, s->linesize[c], s->block);

  1346.                     if (++x == h) {

  1347.                         x = 0;

  1348.                         y++;

  1349.                     }

  1350.                 }

  1351.             }

  1352.             /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

  1353.             if (s->restart_interval && (s->restart_interval < 1350) &&

  1354.                 !--s->restart_count) {

  1355.                 align_get_bits(&s->gb);

  1356.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1357.                 for (i=0; i<nb_components; i++) /* reset dc */

  1358.                     s->last_dc[i] = 1024;

  1359.             }

  1360.         }

  1361.     }

  1362.     return 0;

  1363. }

  1364. 

  1365. static int mjpeg_decode_sos(MJpegDecodeContext *s)

  1366. {

  1367.     int len, nb_components, i, h, v, predictor, point_transform, ilv;

  1368.     int vmax, hmax, index, id;

  1369.     const int block_size= s->lossless ? 1 : 8;

  1370. 

  1371.     /* XXX: verify len field validity */

  1372.     len = get_bits(&s->gb, 16);

  1373.     nb_components = get_bits(&s->gb, 8);

  1374.     if (len != 6+2*nb_components)

  1375.     {

  1376. 	dprintf("decode_sos: invalid len (%d)\n", len);

  1377. 	return -1;

  1378.     }

  1379.     /* XXX: only interleaved scan accepted */

  1380.     if (nb_components != 3)

  1381.     {

  1382. 	dprintf("decode_sos: components(%d) mismatch\n", nb_components);

  1383.         return -1;

  1384.     }

  1385.     vmax = 0;

  1386.     hmax = 0;

  1387.     for(i=0;i<nb_components;i++) {

  1388.         id = get_bits(&s->gb, 8) - 1;

  1389. 	dprintf("component: %d\n", id);

  1390.         /* find component index */

  1391.         for(index=0;index<s->nb_components;index++)

  1392.             if (id == s->component_id[index])

  1393.                 break;

  1394.         if (index == s->nb_components)

  1395. 	{

  1396. 	    dprintf("decode_sos: index(%d) out of components\n", index);

  1397.             return -1;

  1398. 	}

  1399. 

  1400.         s->comp_index[i] = index;

  1401. 

  1402.         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1403.         s->h_scount[i] = s->h_count[index];

  1404.         s->v_scount[i] = s->v_count[index];

  1405. 

  1406.         s->dc_index[i] = get_bits(&s->gb, 4);

  1407.         s->ac_index[i] = get_bits(&s->gb, 4);

  1408. 

  1409. 	if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||

  1410. 	    s->dc_index[i] >= 4 || s->ac_index[i] >= 4)

  1411. 	    goto out_of_range;

  1412. #if 0 //buggy

  1413. 	switch(s->start_code)

  1414. 	{

  1415. 	    case SOF0:

  1416. 		if (dc_index[i] > 1 || ac_index[i] > 1)

  1417. 		    goto out_of_range;

  1418. 		break;

  1419. 	    case SOF1:

  1420. 	    case SOF2:

  1421. 		if (dc_index[i] > 3 || ac_index[i] > 3)

  1422. 		    goto out_of_range;

  1423. 		break;

  1424. 	    case SOF3:

  1425. 		if (dc_index[i] > 3 || ac_index[i] != 0)

  1426. 		    goto out_of_range;

  1427. 		break;	

  1428. 	}

  1429. #endif

  1430.     }

  1431. 

  1432.     predictor= get_bits(&s->gb, 8); /* lossless predictor or start of spectral (Ss) */

  1433.     skip_bits(&s->gb, 8); /* Se */

  1434.     skip_bits(&s->gb, 4); /* Ah */

  1435.     point_transform= get_bits(&s->gb, 4); /* Al */

  1436. 

  1437.     for(i=0;i<nb_components;i++) 

  1438.         s->last_dc[i] = 1024;

  1439. 

  1440.     if (nb_components > 1) {

  1441.         /* interleaved stream */

  1442.         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);

  1443.         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);

  1444.     } else {

  1445.         h = s->h_max / s->h_scount[s->comp_index[0]];

  1446.         v = s->v_max / s->v_scount[s->comp_index[0]];

  1447.         s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);

  1448.         s->mb_height = (s->height + v * block_size - 1) / (v * block_size);

  1449.         s->nb_blocks[0] = 1;

  1450.         s->h_scount[0] = 1;

  1451.         s->v_scount[0] = 1;

  1452.     }

  1453. 

  1454.     if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1455.         printf("%s %s p:%d >>:%d\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "", predictor, point_transform);

  1456.     

  1457.     if(s->lossless){

  1458.             if(s->rgb){

  1459.                 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)

  1460.                     return -1;

  1461.             }else{

  1462.                 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)

  1463.                     return -1;

  1464.             }

  1465.     }else{

  1466.         if(mjpeg_decode_scan(s) < 0)

  1467.             return -1;

  1468.     }

  1469.     emms_c();

  1470.     return 0;

  1471.  out_of_range:

  1472.     dprintf("decode_sos: ac/dc index out of range\n");

  1473.     return -1;

  1474. }

  1475. 

  1476. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1477. {

  1478.     if (get_bits(&s->gb, 16) != 4)

  1479. 	return -1;

  1480.     s->restart_interval = get_bits(&s->gb, 16);

  1481.     dprintf("restart interval: %d\n", s->restart_interval);

  1482. 

  1483.     return 0;

  1484. }

  1485. 

  1486. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1487. {

  1488.     int len, id;

  1489. 

  1490.     /* XXX: verify len field validity */

  1491.     len = get_bits(&s->gb, 16);

  1492.     if (len < 5)

  1493. 	return -1;

  1494. 

  1495.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1496.     id = be2me_32(id);

  1497.     len -= 6;

  1498. 

  1499.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1500.         printf("APPx %8X\n", id); 

  1501.     }

  1502.     

  1503.     /* buggy AVID, it puts EOI only at every 10th frame */

  1504.     /* also this fourcc is used by non-avid files too, it holds some

  1505.        informations, but it's always present in AVID creates files */

  1506.     if (id == ff_get_fourcc("AVI1"))

  1507.     {

  1508. 	/* structure:

  1509. 	    4bytes	AVI1

  1510. 	    1bytes	polarity

  1511. 	    1bytes	always zero

  1512. 	    4bytes	field_size

  1513. 	    4bytes	field_size_less_padding

  1514. 	*/

  1515.     	s->buggy_avid = 1;

  1516. //	if (s->first_picture)

  1517. //	    printf("mjpeg: workarounding buggy AVID\n");

  1518. 	s->interlace_polarity = get_bits(&s->gb, 8);

  1519. #if 0

  1520. 	skip_bits(&s->gb, 8);

  1521. 	skip_bits(&s->gb, 32);

  1522. 	skip_bits(&s->gb, 32);

  1523. 	len -= 10;

  1524. #endif

  1525. //	if (s->interlace_polarity)

  1526. //	    printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1527. 	goto out;

  1528.     }

  1529.     

  1530. //    len -= 2;

  1531.     

  1532.     if (id == ff_get_fourcc("JFIF"))

  1533.     {

  1534. 	int t_w, t_h;

  1535. 	skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1536. 	printf("mjpeg: JFIF header found (version: %x.%x)\n",

  1537. 	    get_bits(&s->gb, 8), get_bits(&s->gb, 8));

  1538. 	if (get_bits(&s->gb, 8) == 0)

  1539. 	{

  1540. 	    int x_density, y_density; 

  1541. 	    x_density = get_bits(&s->gb, 16);

  1542. 	    y_density = get_bits(&s->gb, 16);

  1543. 

  1544. 	    dprintf("x/y density: %d (%f), %d (%f)\n", x_density,

  1545. 		(float)x_density, y_density, (float)y_density);

  1546. #if 0

  1547.             //MN: needs to be checked

  1548.             if(x_density)

  1549. //                s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);

  1550. 		s->avctx->aspect_ratio = (float)x_density/y_density;

  1551. 		/* it's better, but every JFIF I have seen stores 1:1 */

  1552.             else

  1553.                 s->avctx->aspect_ratio= 0.0;

  1554. #endif

  1555. 	}

  1556. 	else

  1557. 	{

  1558. 	    skip_bits(&s->gb, 16);

  1559. 	    skip_bits(&s->gb, 16);

  1560. 	}

  1561. 

  1562. 	t_w = get_bits(&s->gb, 8);

  1563. 	t_h = get_bits(&s->gb, 8);

  1564. 	if (t_w && t_h)

  1565. 	{

  1566. 	    /* skip thumbnail */

  1567. 	    if (len-10-(t_w*t_h*3) > 0)

  1568. 		len -= t_w*t_h*3;

  1569. 	}

  1570. 	len -= 10;

  1571. 	goto out;

  1572.     }

  1573.     

  1574.     if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1575.     {

  1576. 	printf("mjpeg: Adobe header found\n");

  1577. 	skip_bits(&s->gb, 16); /* version */

  1578. 	skip_bits(&s->gb, 16); /* flags0 */

  1579. 	skip_bits(&s->gb, 16); /* flags1 */

  1580. 	skip_bits(&s->gb, 8); /* transform */

  1581. 	len -= 7;

  1582. 	goto out;

  1583.     }

  1584. 

  1585.     if (id == ff_get_fourcc("LJIF")){

  1586.         printf("Pegasus lossless jpeg header found\n");

  1587. 	skip_bits(&s->gb, 16); /* version ? */

  1588. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1589. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1590. 	skip_bits(&s->gb, 16); /* unknwon always 0? */

  1591.         switch( get_bits(&s->gb, 8)){

  1592.         case 1:

  1593.             s->rgb= 1;

  1594.             s->pegasus_rct=0;

  1595.             break;

  1596.         case 2:

  1597.             s->rgb= 1;

  1598.             s->pegasus_rct=1;

  1599.             break;

  1600.         default:

  1601.             printf("unknown colorspace\n");

  1602.         }

  1603.         len -= 9;

  1604.         goto out;

  1605.     }

  1606.     

  1607.     /* Apple MJPEG-A */

  1608.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1609.     {

  1610. 	id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1611. 	id = be2me_32(id);

  1612. 	len -= 4;

  1613. 	if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */

  1614. 	{

  1615. #if 0

  1616. 	    skip_bits(&s->gb, 32); /* field size */

  1617. 	    skip_bits(&s->gb, 32); /* pad field size */

  1618. 	    skip_bits(&s->gb, 32); /* next off */

  1619. 	    skip_bits(&s->gb, 32); /* quant off */

  1620. 	    skip_bits(&s->gb, 32); /* huff off */

  1621. 	    skip_bits(&s->gb, 32); /* image off */

  1622. 	    skip_bits(&s->gb, 32); /* scan off */

  1623. 	    skip_bits(&s->gb, 32); /* data off */

  1624. #endif

  1625. 	    if (s->first_picture)

  1626. 		printf("mjpeg: Apple MJPEG-A header found\n");

  1627. 	}

  1628.     }

  1629. 

  1630. out:

  1631.     /* slow but needed for extreme adobe jpegs */

  1632.     if (len < 0)

  1633. 	printf("mjpeg: error, decode_app parser read over the end\n");

  1634.     while(--len > 0)

  1635. 	skip_bits(&s->gb, 8);

  1636. 

  1637.     return 0;

  1638. }

  1639. 

  1640. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1641. {

  1642.     /* XXX: verify len field validity */

  1643.     int len = get_bits(&s->gb, 16);

  1644.     if (len >= 2 && len < 32768) {

  1645. 	/* XXX: any better upper bound */

  1646. 	uint8_t *cbuf = av_malloc(len - 1);

  1647. 	if (cbuf) {

  1648. 	    int i;

  1649. 	    for (i = 0; i < len - 2; i++)

  1650. 		cbuf[i] = get_bits(&s->gb, 8);

  1651. 	    if (i > 0 && cbuf[i-1] == '\n')

  1652. 		cbuf[i-1] = 0;

  1653. 	    else

  1654. 		cbuf[i] = 0;

  1655. 

  1656. 	    printf("mjpeg comment: '%s'\n", cbuf);

  1657. 

  1658. 	    /* buggy avid, it puts EOI only at every 10th frame */

  1659. 	    if (!strcmp(cbuf, "AVID"))

  1660. 	    {

  1661. 		s->buggy_avid = 1;

  1662. 		//	if (s->first_picture)

  1663. 		//	    printf("mjpeg: workarounding buggy AVID\n");

  1664. 	    }

  1665. 

  1666. 	    av_free(cbuf);

  1667. 	}

  1668.     }

  1669. 

  1670.     return 0;

  1671. }

  1672. 

  1673. #if 0

  1674. static int valid_marker_list[] =

  1675. {

  1676.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1677. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1678. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1679. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1680. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1681. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1682. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1683. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1684. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1685. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1686. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1687. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1688. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1689. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1690. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1691. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1692. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1693. }

  1694. #endif

  1695. 

  1696. /* return the 8 bit start code value and update the search

  1697.    state. Return -1 if no start code found */

  1698. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1699. {

  1700.     uint8_t *buf_ptr;

  1701.     unsigned int v, v2;

  1702.     int val;

  1703. #ifdef DEBUG

  1704.     int skipped=0;

  1705. #endif

  1706. 

  1707.     buf_ptr = *pbuf_ptr;

  1708.     while (buf_ptr < buf_end) {

  1709.         v = *buf_ptr++;

  1710. 	v2 = *buf_ptr;

  1711.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {

  1712. 	    val = *buf_ptr++;

  1713. 	    goto found;

  1714.         }

  1715. #ifdef DEBUG

  1716. 	skipped++;

  1717. #endif

  1718.     }

  1719.     val = -1;

  1720. found:

  1721. #ifdef DEBUG

  1722.     dprintf("find_marker skipped %d bytes\n", skipped);

  1723. #endif

  1724.     *pbuf_ptr = buf_ptr;

  1725.     return val;

  1726. }

  1727. 

  1728. static int mjpeg_decode_frame(AVCodecContext *avctx, 

  1729.                               void *data, int *data_size,

  1730.                               uint8_t *buf, int buf_size)

  1731. {

  1732.     MJpegDecodeContext *s = avctx->priv_data;

  1733.     uint8_t *buf_end, *buf_ptr;

  1734.     int i, start_code;

  1735.     AVFrame *picture = data;

  1736. 

  1737.     *data_size = 0;

  1738. 

  1739.     /* no supplementary picture */

  1740.     if (buf_size == 0)

  1741.         return 0;

  1742. 

  1743.     buf_ptr = buf;

  1744.     buf_end = buf + buf_size;

  1745.     while (buf_ptr < buf_end) {

  1746.         /* find start next marker */

  1747.         start_code = find_marker(&buf_ptr, buf_end);

  1748. 	{

  1749. 	    /* EOF */

  1750.             if (start_code < 0) {

  1751. 		goto the_end;

  1752.             } else {

  1753.                 dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);

  1754. 		

  1755. 		if ((buf_end - buf_ptr) > s->buffer_size)

  1756. 		{

  1757. 		    av_free(s->buffer);

  1758. 		    s->buffer_size = buf_end-buf_ptr;

  1759. 		    s->buffer = av_malloc(s->buffer_size);

  1760. 		    dprintf("buffer too small, expanding to %d bytes\n",

  1761. 			s->buffer_size);

  1762. 		}

  1763. 		

  1764. 		/* unescape buffer of SOS */

  1765. 		if (start_code == SOS)

  1766. 		{

  1767. 		    uint8_t *src = buf_ptr;

  1768. 		    uint8_t *dst = s->buffer;

  1769. 

  1770. 		    while (src<buf_end)

  1771. 		    {

  1772. 			uint8_t x = *(src++);

  1773. 

  1774. 			*(dst++) = x;

  1775. 			if (x == 0xff)

  1776. 			{

  1777. 			    while(*src == 0xff) src++;

  1778. 

  1779. 			    x = *(src++);

  1780. 			    if (x >= 0xd0 && x <= 0xd7)

  1781. 				*(dst++) = x;

  1782. 			    else if (x)

  1783. 				break;

  1784. 			}

  1785. 		    }

  1786. 		    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1787. 		    

  1788. 		    dprintf("escaping removed %d bytes\n",

  1789. 			(buf_end - buf_ptr) - (dst - s->buffer));

  1790. 		}

  1791. 		else

  1792. 		    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1793. 		

  1794. 		s->start_code = start_code;

  1795.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1796.                     printf("startcode: %X\n", start_code);

  1797.                 }

  1798. 

  1799. 		/* process markers */

  1800. 		if (start_code >= 0xd0 && start_code <= 0xd7) {

  1801. 		    dprintf("restart marker: %d\n", start_code&0x0f);

  1802. 		} else if (s->first_picture) {

  1803. 		    /* APP fields */

  1804. 		    if (start_code >= 0xe0 && start_code <= 0xef)

  1805. 			mjpeg_decode_app(s);

  1806. 		    /* Comment */

  1807. 		    else if (start_code == COM)

  1808. 			mjpeg_decode_com(s);

  1809. 		}

  1810. 

  1811.                 switch(start_code) {

  1812.                 case SOI:

  1813. 		    s->restart_interval = 0;

  1814.                     /* nothing to do on SOI */

  1815.                     break;

  1816.                 case DQT:

  1817.                     mjpeg_decode_dqt(s);

  1818.                     break;

  1819.                 case DHT:

  1820.                     if(mjpeg_decode_dht(s) < 0){

  1821.                         fprintf(stderr, "huffman table decode error\n");

  1822.                         return -1;

  1823.                     }

  1824.                     break;

  1825.                 case SOF0:

  1826.                     s->lossless=0;

  1827.                     if (mjpeg_decode_sof(s) < 0) 

  1828. 			return -1;

  1829.                     break;

  1830.                 case SOF3:

  1831.                     s->lossless=1;

  1832.                     if (mjpeg_decode_sof(s) < 0) 

  1833. 			return -1;

  1834.                     break;

  1835. 		case EOI:

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

  1837.                         break;

  1838. eoi_parser:

  1839. 		    {

  1840.                         if (s->interlaced) {

  1841.                             s->bottom_field ^= 1;

  1842.                             /* if not bottom field, do not output image yet */

  1843.                             if (s->bottom_field)

  1844.                                 goto not_the_end;

  1845.                         }

  1846.                         for(i=0;i<3;i++) {

  1847.                             picture->data[i] = s->current_picture[i];

  1848. 			    picture->linesize[i] = (s->interlaced) ?

  1849. 				s->linesize[i] >> 1 : s->linesize[i];

  1850.                         }

  1851.                         *data_size = sizeof(AVFrame);

  1852.                         avctx->height = s->height;

  1853.                         if (s->interlaced)

  1854.                             avctx->height *= 2;

  1855.                         avctx->width = s->width;

  1856.                         /* XXX: not complete test ! */

  1857.                         switch((s->h_count[0] << 4) | s->v_count[0]) {

  1858.                         case 0x11:

  1859.                             if(s->rgb){

  1860.                                 avctx->pix_fmt = PIX_FMT_RGBA32;

  1861.                             }else

  1862.                                 avctx->pix_fmt = PIX_FMT_YUV444P;

  1863.                             break;

  1864.                         case 0x21:

  1865.                             avctx->pix_fmt = PIX_FMT_YUV422P;

  1866.                             break;

  1867.                         default:

  1868.                         case 0x22:

  1869.                             avctx->pix_fmt = PIX_FMT_YUV420P;

  1870.                             break;

  1871.                         }

  1872. 

  1873.                         if(!s->lossless){

  1874.                             picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); 

  1875.                             picture->qstride= 0;

  1876.                             picture->qscale_table= s->qscale_table;

  1877.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1878.                             if(avctx->debug & FF_DEBUG_QP)

  1879.                                 printf("QP: %d\n", (int)picture->quality);

  1880.                         }

  1881.                         

  1882.                         goto the_end;

  1883.                     }

  1884. 		    break;

  1885.                 case SOS:

  1886.                     mjpeg_decode_sos(s);

  1887. 		    /* buggy avid puts EOI every 10-20th frame */

  1888. 		    /* if restart period is over process EOI */

  1889. 		    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1890. 			goto eoi_parser;

  1891.                     break;

  1892. 		case DRI:

  1893. 		    mjpeg_decode_dri(s);

  1894. 		    break;

  1895. 		case SOF1:

  1896. 		case SOF2:

  1897. 		case SOF5:

  1898. 		case SOF6:

  1899. 		case SOF7:

  1900. 		case SOF9:

  1901. 		case SOF10:

  1902. 		case SOF11:

  1903. 		case SOF13:

  1904. 		case SOF14:

  1905. 		case SOF15:

  1906. 		case JPG:

  1907. 		    printf("mjpeg: unsupported coding type (%x)\n", start_code);

  1908. 		    break;

  1909. //		default:

  1910. //		    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1911. //		    break;

  1912.                 }

  1913. 

  1914. not_the_end:

  1915. 		/* eof process start code */

  1916. 		buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1917. 		dprintf("marker parser used %d bytes (%d bits)\n",

  1918. 		    (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1919.             }

  1920.         }

  1921.     }

  1922. the_end:

  1923.     dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);

  1924. //    return buf_end - buf_ptr;

  1925.     return buf_ptr - buf;

  1926. }

  1927. 

  1928. static int mjpegb_decode_frame(AVCodecContext *avctx, 

  1929.                               void *data, int *data_size,

  1930.                               uint8_t *buf, int buf_size)

  1931. {

  1932.     MJpegDecodeContext *s = avctx->priv_data;

  1933.     uint8_t *buf_end, *buf_ptr;

  1934.     int i;

  1935.     AVFrame *picture = data;

  1936.     GetBitContext hgb; /* for the header */

  1937.     uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

  1938.     uint32_t field_size;

  1939. 

  1940.     *data_size = 0;

  1941. 

  1942.     /* no supplementary picture */

  1943.     if (buf_size == 0)

  1944.         return 0;

  1945. 

  1946.     buf_ptr = buf;

  1947.     buf_end = buf + buf_size;

  1948.     

  1949. read_header:

  1950.     /* reset on every SOI */

  1951.     s->restart_interval = 0;

  1952. 

  1953.     init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);

  1954. 

  1955.     skip_bits(&hgb, 32); /* reserved zeros */

  1956.     

  1957.     if (get_bits(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

  1958.     {

  1959. 	dprintf("not mjpeg-b (bad fourcc)\n");

  1960. 	return 0;

  1961.     }

  1962. 

  1963.     field_size = get_bits(&hgb, 32); /* field size */

  1964.     dprintf("field size: 0x%x\n", field_size);

  1965.     skip_bits(&hgb, 32); /* padded field size */

  1966.     second_field_offs = get_bits(&hgb, 32);

  1967.     dprintf("second field offs: 0x%x\n", second_field_offs);

  1968.     if (second_field_offs)

  1969. 	s->interlaced = 1;

  1970. 

  1971.     dqt_offs = get_bits(&hgb, 32);

  1972.     dprintf("dqt offs: 0x%x\n", dqt_offs);

  1973.     if (dqt_offs)

  1974.     {

  1975. 	init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

  1976. 	s->start_code = DQT;

  1977. 	mjpeg_decode_dqt(s);

  1978.     }

  1979.     

  1980.     dht_offs = get_bits(&hgb, 32);

  1981.     dprintf("dht offs: 0x%x\n", dht_offs);

  1982.     if (dht_offs)

  1983.     {

  1984. 	init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

  1985. 	s->start_code = DHT;

  1986. 	mjpeg_decode_dht(s);

  1987.     }

  1988. 

  1989.     sof_offs = get_bits(&hgb, 32);

  1990.     dprintf("sof offs: 0x%x\n", sof_offs);

  1991.     if (sof_offs)

  1992.     {

  1993. 	init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

  1994. 	s->start_code = SOF0;

  1995. 	if (mjpeg_decode_sof(s) < 0)

  1996. 	    return -1;

  1997.     }

  1998. 

  1999.     sos_offs = get_bits(&hgb, 32);

  2000.     dprintf("sos offs: 0x%x\n", sos_offs);

  2001.     if (sos_offs)

  2002.     {

  2003. //	init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);

  2004. 	init_get_bits(&s->gb, buf+sos_offs, field_size*8);

  2005. 	s->start_code = SOS;

  2006. 	mjpeg_decode_sos(s);

  2007.     }

  2008. 

  2009.     skip_bits(&hgb, 32); /* start of data offset */

  2010. 

  2011.     if (s->interlaced) {

  2012.         s->bottom_field ^= 1;

  2013.         /* if not bottom field, do not output image yet */

  2014.         if (s->bottom_field && second_field_offs)

  2015. 	{

  2016. 	    buf_ptr = buf + second_field_offs;

  2017. 	    second_field_offs = 0;

  2018. 	    goto read_header;

  2019.     	}

  2020.     }

  2021. 

  2022.     //XXX FIXME factorize, this looks very similar to the EOI code

  2023.     

  2024.     for(i=0;i<3;i++) {

  2025.         picture->data[i] = s->current_picture[i];

  2026.         picture->linesize[i] = (s->interlaced) ?

  2027.     	    s->linesize[i] >> 1 : s->linesize[i];

  2028.     }

  2029.     *data_size = sizeof(AVFrame);

  2030.     avctx->height = s->height;

  2031.     if (s->interlaced)

  2032.         avctx->height *= 2;

  2033.     avctx->width = s->width;

  2034.     /* XXX: not complete test ! */

  2035.     switch((s->h_count[0] << 4) | s->v_count[0]) {

  2036.         case 0x11:

  2037.     	    avctx->pix_fmt = PIX_FMT_YUV444P;

  2038.             break;

  2039.         case 0x21:

  2040.             avctx->pix_fmt = PIX_FMT_YUV422P;

  2041.             break;

  2042.         default:

  2043. 	case 0x22:

  2044.             avctx->pix_fmt = PIX_FMT_YUV420P;

  2045.             break;

  2046.     }

  2047.     

  2048.     if(!s->lossless){

  2049.         picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); 

  2050.         picture->qstride= 0;

  2051.         picture->qscale_table= s->qscale_table;

  2052.         memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  2053.         if(avctx->debug & FF_DEBUG_QP)

  2054.             printf("QP: %f\n", picture->quality);

  2055.     }

  2056. 

  2057.     return buf_ptr - buf;

  2058. }

  2059. 

  2060. 

  2061. static int mjpeg_decode_end(AVCodecContext *avctx)

  2062. {

  2063.     MJpegDecodeContext *s = avctx->priv_data;

  2064.     int i, j;

  2065. 

  2066.     av_free(s->buffer);

  2067.     av_free(s->qscale_table);

  2068.     for(i=0;i<MAX_COMPONENTS;i++)

  2069.         av_free(s->current_picture[i]);

  2070.     for(i=0;i<2;i++) {

  2071.         for(j=0;j<4;j++)

  2072.             free_vlc(&s->vlcs[i][j]);

  2073.     }

  2074.     return 0;

  2075. }

  2076. 

  2077. AVCodec mjpeg_decoder = {

  2078.     "mjpeg",

  2079.     CODEC_TYPE_VIDEO,

  2080.     CODEC_ID_MJPEG,

  2081.     sizeof(MJpegDecodeContext),

  2082.     mjpeg_decode_init,

  2083.     NULL,

  2084.     mjpeg_decode_end,

  2085.     mjpeg_decode_frame,

  2086.     0,

  2087.     NULL

  2088. };

  2089. 

  2090. AVCodec mjpegb_decoder = {

  2091.     "mjpegb",

  2092.     CODEC_TYPE_VIDEO,

  2093.     CODEC_ID_MJPEGB,

  2094.     sizeof(MJpegDecodeContext),

  2095.     mjpeg_decode_init,

  2096.     NULL,

  2097.     mjpeg_decode_end,

  2098.     mjpegb_decode_frame,

  2099.     0,

  2100.     NULL

  2101. };

  2102. 

  2103. #ifdef CONFIG_ENCODERS

  2104. AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them

  2105.     "ljpeg",

  2106.     CODEC_TYPE_VIDEO,

  2107.     CODEC_ID_LJPEG,

  2108.     sizeof(MpegEncContext),

  2109.     MPV_encode_init,

  2110.     encode_picture_lossless,

  2111.     MPV_encode_end,

  2112. };

  2113. #endif