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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 and new decode_frame mechanism

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

  22.  */

  23. //#define DEBUG

  24. #include "avcodec.h"

  25. #include "dsputil.h"

  26. #include "mpegvideo.h"

  27. 

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

  29. /* not yet working */

  30. #undef TWOMATRIXES

  31. 

  32. typedef struct MJpegContext {

  33.     UINT8 huff_size_dc_luminance[12];

  34.     UINT16 huff_code_dc_luminance[12];

  35.     UINT8 huff_size_dc_chrominance[12];

  36.     UINT16 huff_code_dc_chrominance[12];

  37. 

  38.     UINT8 huff_size_ac_luminance[256];

  39.     UINT16 huff_code_ac_luminance[256];

  40.     UINT8 huff_size_ac_chrominance[256];

  41.     UINT16 huff_code_ac_chrominance[256];

  42. } MJpegContext;

  43. 

  44. /* JPEG marker codes */

  45. typedef enum {

  46.     /* start of frame */

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

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

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

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

  51. 

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

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

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

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

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

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

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

  59. 

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

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

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

  63. 

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

  65. 

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

  67. 

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

  69.     RST0  = 0xd0,

  70.     RST1  = 0xd1,

  71.     RST2  = 0xd2,

  72.     RST3  = 0xd3,

  73.     RST4  = 0xd4,

  74.     RST5  = 0xd5,

  75.     RST6  = 0xd6,

  76.     RST7  = 0xd7,

  77. 

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

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

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

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

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

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

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

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

  86. 

  87.     APP0  = 0xe0,

  88.     APP1  = 0xe1,

  89.     APP2  = 0xe2,

  90.     APP3  = 0xe3,

  91.     APP4  = 0xe4,

  92.     APP5  = 0xe5,

  93.     APP6  = 0xe6,

  94.     APP7  = 0xe7,

  95.     APP8  = 0xe8,

  96.     APP9  = 0xe9,

  97.     APP10 = 0xea,

  98.     APP11 = 0xeb,

  99.     APP12 = 0xec,

  100.     APP13 = 0xed,

  101.     APP14 = 0xee,

  102.     APP15 = 0xef,

  103. 

  104.     JPG0  = 0xf0,

  105.     JPG1  = 0xf1,

  106.     JPG2  = 0xf2,

  107.     JPG3  = 0xf3,

  108.     JPG4  = 0xf4,

  109.     JPG5  = 0xf5,

  110.     JPG6  = 0xf6,

  111.     JPG7  = 0xf7,

  112.     JPG8  = 0xf8,

  113.     JPG9  = 0xf9,

  114.     JPG10 = 0xfa,

  115.     JPG11 = 0xfb,

  116.     JPG12 = 0xfc,

  117.     JPG13 = 0xfd,

  118. 

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

  120. 

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

  122. 

  123.     /* 0x02 -> 0xbf reserved */

  124. } JPEG_MARKER;

  125. 

  126. #if 0

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

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

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

  130.  */

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

  132.     16,  11,  10,  16,  24,  40,  51,  61,

  133.     12,  12,  14,  19,  26,  58,  60,  55,

  134.     14,  13,  16,  24,  40,  57,  69,  56,

  135.     14,  17,  22,  29,  51,  87,  80,  62,

  136.     18,  22,  37,  56,  68, 109, 103,  77,

  137.     24,  35,  55,  64,  81, 104, 113,  92,

  138.     49,  64,  78,  87, 103, 121, 120, 101,

  139.     72,  92,  95,  98, 112, 100, 103,  99

  140. };

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

  142.     17,  18,  24,  47,  99,  99,  99,  99,

  143.     18,  21,  26,  66,  99,  99,  99,  99,

  144.     24,  26,  56,  99,  99,  99,  99,  99,

  145.     47,  66,  99,  99,  99,  99,  99,  99,

  146.     99,  99,  99,  99,  99,  99,  99,  99,

  147.     99,  99,  99,  99,  99,  99,  99,  99,

  148.     99,  99,  99,  99,  99,  99,  99,  99,

  149.     99,  99,  99,  99,  99,  99,  99,  99

  150. };

  151. #endif

  152. 

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

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

  155. static const UINT8 bits_dc_luminance[17] =

  156. { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };

  157. static const UINT8 val_dc_luminance[] =

  158. { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  159. 

  160. static const UINT8 bits_dc_chrominance[17] =

  161. { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };

  162. static const UINT8 val_dc_chrominance[] =

  163. { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  164. 

  165. static const UINT8 bits_ac_luminance[17] =

  166. { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };

  167. static const UINT8 val_ac_luminance[] =

  168. { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,

  169.   0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,

  170.   0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,

  171.   0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,

  172.   0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,

  173.   0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,

  174.   0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,

  175.   0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,

  176.   0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,

  177.   0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

  178.   0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

  179.   0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,

  180.   0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,

  181.   0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,

  182.   0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,

  183.   0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,

  184.   0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,

  185.   0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,

  186.   0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,

  187.   0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

  188.   0xf9, 0xfa 

  189. };

  190. 

  191. static const UINT8 bits_ac_chrominance[17] =

  192. { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };

  193. 

  194. static const UINT8 val_ac_chrominance[] =

  195. { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,

  196.   0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,

  197.   0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,

  198.   0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,

  199.   0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,

  200.   0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,

  201.   0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,

  202.   0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,

  203.   0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,

  204.   0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,

  205.   0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,

  206.   0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,

  207.   0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,

  208.   0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,

  209.   0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,

  210.   0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,

  211.   0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,

  212.   0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,

  213.   0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,

  214.   0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

  215.   0xf9, 0xfa 

  216. };

  217. 

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

  219. static void build_huffman_codes(UINT8 *huff_size, UINT16 *huff_code,

  220.                                 const UINT8 *bits_table, const UINT8 *val_table)

  221. {

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

  223. 

  224.     code = 0;

  225.     k = 0;

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

  227.         nb = bits_table[i];

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

  229.             sym = val_table[k++];

  230.             huff_size[sym] = i;

  231.             huff_code[sym] = code;

  232.             code++;

  233.         }

  234.         code <<= 1;

  235.     }

  236. }

  237. 

  238. int mjpeg_init(MpegEncContext *s)

  239. {

  240.     MJpegContext *m;

  241.     

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

  243.     if (!m)

  244.         return -1;

  245.     

  246.     s->min_qcoeff=-1023;

  247.     s->max_qcoeff= 1023;

  248.     s->intra_quant_bias= 1<<(QUANT_BIAS_SHIFT-1); //(a + x/2)/x

  249. 

  250.     /* build all the huffman tables */

  251.     build_huffman_codes(m->huff_size_dc_luminance,

  252.                         m->huff_code_dc_luminance,

  253.                         bits_dc_luminance,

  254.                         val_dc_luminance);

  255.     build_huffman_codes(m->huff_size_dc_chrominance,

  256.                         m->huff_code_dc_chrominance,

  257.                         bits_dc_chrominance,

  258.                         val_dc_chrominance);

  259.     build_huffman_codes(m->huff_size_ac_luminance,

  260.                         m->huff_code_ac_luminance,

  261.                         bits_ac_luminance,

  262.                         val_ac_luminance);

  263.     build_huffman_codes(m->huff_size_ac_chrominance,

  264.                         m->huff_code_ac_chrominance,

  265.                         bits_ac_chrominance,

  266.                         val_ac_chrominance);

  267.     

  268.     s->mjpeg_ctx = m;

  269.     return 0;

  270. }

  271. 

  272. void mjpeg_close(MpegEncContext *s)

  273. {

  274.     av_free(s->mjpeg_ctx);

  275. }

  276. 

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

  278. {

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

  280.     put_bits(p, 8, code);

  281. }

  282. 

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

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

  285.                              const UINT8 *bits_table, const UINT8 *value_table)

  286. {

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

  288.     int n, i;

  289. 

  290.     put_bits(p, 4, table_class);

  291.     put_bits(p, 4, table_id);

  292. 

  293.     n = 0;

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

  295.         n += bits_table[i];

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

  297.     }

  298. 

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

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

  301. 

  302.     return n + 17;

  303. }

  304. 

  305. static void jpeg_table_header(MpegEncContext *s)

  306. {

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

  308.     int i, j, size;

  309.     UINT8 *ptr;

  310. 

  311.     /* quant matrixes */

  312.     put_marker(p, DQT);

  313. #ifdef TWOMATRIXES

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

  315. #else

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

  317. #endif

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

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

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

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

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

  323.     }

  324. #ifdef TWOMATRIXES

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

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

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

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

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

  330.     }

  331. #endif

  332. 

  333.     /* huffman table */

  334.     put_marker(p, DHT);

  335.     flush_put_bits(p);

  336.     ptr = pbBufPtr(p);

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

  338.     size = 2;

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

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

  341.     

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

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

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

  345.     ptr[1] = size;

  346. }

  347. 

  348. static void jpeg_put_comments(MpegEncContext *s)

  349. {

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

  351.     int size;

  352.     UINT8 *ptr;

  353. 

  354.     if (s->aspect_ratio_info)

  355.     {

  356.     /* JFIF header */

  357.     put_marker(p, APP0);

  358.     put_bits(p, 16, 16);

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

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

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

  362.     switch(s->aspect_ratio_info)

  363.     {

  364. 	case FF_ASPECT_4_3_625:

  365. 	case FF_ASPECT_4_3_525:

  366. 	    put_bits(p, 16, 4); 

  367. 	    put_bits(p, 16, 3);

  368. 	    break;

  369. 	case FF_ASPECT_16_9_625:

  370. 	case FF_ASPECT_16_9_525:

  371. 	    put_bits(p, 16, 16); 

  372. 	    put_bits(p, 16, 9);

  373. 	    break;

  374. 	case FF_ASPECT_EXTENDED:

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

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

  377. 	    break;

  378. 	case FF_ASPECT_SQUARE:

  379. 	default:

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

  381. 	    put_bits(p, 16, 1);

  382. 	    break;

  383.     }

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

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

  386.     }

  387. 

  388.     /* comment */

  389.     if(!ff_bit_exact){

  390.         put_marker(p, COM);

  391.         flush_put_bits(p);

  392.         ptr = pbBufPtr(p);

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

  394. #define MJPEG_VERSION "FFmpeg" LIBAVCODEC_VERSION "b" LIBAVCODEC_BUILD_STR

  395.         put_string(p, MJPEG_VERSION);

  396.         size = strlen(MJPEG_VERSION)+3;

  397. #undef MJPEG_VERSION

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

  399.         ptr[1] = size;

  400.     }

  401. }

  402. 

  403. void mjpeg_picture_header(MpegEncContext *s)

  404. {

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

  406. 

  407.     if (!s->mjpeg_data_only_frames)

  408.     {

  409.     jpeg_put_comments(s);    

  410. 

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

  412. 

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

  414. 

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

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

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

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

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

  420.     

  421.     /* Y component */

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

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

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

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

  426.     

  427.     /* Cb component */

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

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

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

  431. #ifdef TWOMATRIXES

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

  433. #else

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

  435. #endif

  436. 

  437.     /* Cr component */

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

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

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

  441. #ifdef TWOMATRIXES

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

  443. #else

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

  445. #endif

  446.     }

  447. 

  448.     /* scan header */

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

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

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

  452.     

  453.     /* Y component */

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

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

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

  457.     

  458.     /* Cb component */

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

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

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

  462.     

  463.     /* Cr component */

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

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

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

  467. 

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

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

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

  471. }

  472. 

  473. static void escape_FF(MpegEncContext *s)

  474. {

  475.     int size= get_bit_count(&s->pb) - s->header_bits;

  476.     int i, ff_count;

  477.     uint8_t *buf= s->pb.buf + (s->header_bits>>3);

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

  479.     

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

  481.     size >>= 3;

  482.     

  483.     ff_count=0;

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

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

  486.     }

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

  488.         int acc, v;

  489. 

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

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

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

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

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

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

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

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

  498. 

  499.         acc>>=4;

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

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

  502.         ff_count+= acc&0xFF;

  503.     }

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

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

  506.     }

  507. 

  508.     if(ff_count==0) return;

  509.     

  510.     /* skip put bits */

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

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

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

  514.     flush_put_bits(&s->pb); 

  515. 

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

  517.         int v= buf[i];

  518. 

  519.         if(v==0xFF){

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

  521.             buf[i+ff_count]= 0;

  522.             ff_count--;

  523.         }

  524. 

  525.         buf[i+ff_count]= v;

  526.     }

  527. }

  528. 

  529. void mjpeg_picture_trailer(MpegEncContext *s)

  530. {

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

  532.     

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

  534.     flush_put_bits(&s->pb);

  535. 

  536.     escape_FF(s);

  537. 

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

  539. }

  540. 

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

  542. 				   UINT8 *huff_size, UINT16 *huff_code)

  543. {

  544.     int mant, nbits;

  545. 

  546.     if (val == 0) {

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

  548.     } else {

  549.         mant = val;

  550.         if (val < 0) {

  551.             val = -val;

  552.             mant--;

  553.         }

  554.         

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

  556.         nbits = 0;

  557.         while (val != 0) {

  558.             val = val >> 1;

  559.             nbits++;

  560.         }

  561.             

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

  563.         

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

  565.     }

  566. }

  567. 

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

  569. {

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

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

  572.     MJpegContext *m = s->mjpeg_ctx;

  573.     UINT8 *huff_size_ac;

  574.     UINT16 *huff_code_ac;

  575.     

  576.     /* DC coef */

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

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

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

  580.     if (n < 4) {

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

  582.         huff_size_ac = m->huff_size_ac_luminance;

  583.         huff_code_ac = m->huff_code_ac_luminance;

  584.     } else {

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

  586.         huff_size_ac = m->huff_size_ac_chrominance;

  587.         huff_code_ac = m->huff_code_ac_chrominance;

  588.     }

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

  590.     

  591.     /* AC coefs */

  592.     

  593.     run = 0;

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

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

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

  597.         val = block[j];

  598.         if (val == 0) {

  599.             run++;

  600.         } else {

  601.             while (run >= 16) {

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

  603.                 run -= 16;

  604.             }

  605.             mant = val;

  606.             if (val < 0) {

  607.                 val = -val;

  608.                 mant--;

  609.             }

  610.             

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

  612.             nbits = 0;

  613.             while (val != 0) {

  614.                 val = val >> 1;

  615.                 nbits++;

  616.             }

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

  618. 

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

  620.         

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

  622.             run = 0;

  623.         }

  624.     }

  625. 

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

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

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

  629. }

  630. 

  631. void mjpeg_encode_mb(MpegEncContext *s, 

  632.                      DCTELEM block[6][64])

  633. {

  634.     int i;

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

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

  637.     }

  638. }

  639. 

  640. /******************************************/

  641. /* decoding */

  642. 

  643. #define MAX_COMPONENTS 4

  644. 

  645. typedef struct MJpegDecodeContext {

  646.     AVCodecContext *avctx;

  647.     GetBitContext gb;

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

  649. 

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

  651.     int buffer_size;

  652.     UINT8 *buffer;

  653. 

  654.     INT16 quant_matrixes[4][64];

  655.     VLC vlcs[2][4];

  656. 

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

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

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

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

  661. 

  662.     int width, height;

  663.     int nb_components;

  664.     int component_id[MAX_COMPONENTS];

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

  666.     int v_count[MAX_COMPONENTS];

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

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

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

  670.     UINT8 *current_picture[MAX_COMPONENTS]; /* picture structure */

  671.     int linesize[MAX_COMPONENTS];

  672.     DCTELEM block[64] __align8;

  673.     ScanTable scantable;

  674.     void (*idct_put)(UINT8 *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);

  675. 

  676.     int restart_interval;

  677.     int restart_count;

  678. 

  679.     int buggy_avid;

  680.     int interlace_polarity;

  681. } MJpegDecodeContext;

  682. 

  683. static int mjpeg_decode_dht(MJpegDecodeContext *s);

  684. 

  685. static void build_vlc(VLC *vlc, const UINT8 *bits_table, const UINT8 *val_table, 

  686.                       int nb_codes)

  687. {

  688.     UINT8 huff_size[256];

  689.     UINT16 huff_code[256];

  690. 

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

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

  693.     

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

  695. }

  696. 

  697. static int mjpeg_decode_init(AVCodecContext *avctx)

  698. {

  699.     MJpegDecodeContext *s = avctx->priv_data;

  700.     MpegEncContext s2;

  701. 

  702.     s->avctx = avctx;

  703. 

  704.     /* ugly way to get the idct & scantable */

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

  706.     s2.flags= avctx->flags;

  707.     s2.avctx= avctx;

  708. //    s2->out_format = FMT_MJPEG;

  709.     s2.width = 8;

  710.     s2.height = 8;

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

  712.        return -1;

  713.     s->scantable= s2.intra_scantable;

  714.     s->idct_put= s2.idct_put;

  715.     MPV_common_end(&s2);

  716. 

  717.     s->mpeg_enc_ctx_allocated = 0;

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

  719. 				but photojpg files could ahive bigger sizes */

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

  721.     s->start_code = -1;

  722.     s->first_picture = 1;

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

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

  725.     

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

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

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

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

  730. 

  731.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  732.     {

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

  734. 	init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size);

  735. 	mjpeg_decode_dht(s);

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

  737.     }

  738. 

  739.     return 0;

  740. }

  741. 

  742. /* quantize tables */

  743. static int mjpeg_decode_dqt(MJpegDecodeContext *s)

  744. {

  745.     int len, index, i, j;

  746.     

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

  748. 

  749.     while (len >= 65) {

  750.         /* only 8 bit precision handled */

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

  752. 	{

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

  754.             return -1;

  755. 	}

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

  757.         if (index >= 4)

  758.             return -1;

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

  760.         /* read quant table */

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

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

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

  764.         }

  765.         len -= 65;

  766.     }

  767.     

  768.     return 0;

  769. }

  770. 

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

  772. static int mjpeg_decode_dht(MJpegDecodeContext *s)

  773. {

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

  775.     UINT8 bits_table[17];

  776.     UINT8 val_table[256];

  777.     

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

  779. 

  780.     while (len > 0) {

  781.         if (len < 17)

  782.             return -1;

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

  784.         if (class >= 2)

  785.             return -1;

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

  787.         if (index >= 4)

  788.             return -1;

  789.         n = 0;

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

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

  792.             n += bits_table[i];

  793.         }

  794.         len -= 17;

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

  796.             return -1;

  797. 

  798.         code_max = 0;

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

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

  801.             if (v > code_max)

  802.                 code_max = v;

  803.             val_table[i] = v;

  804.         }

  805.         len -= n;

  806. 

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

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

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

  810.                class, index, code_max + 1);

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

  812.     }

  813.     return 0;

  814. }

  815. 

  816. static int mjpeg_decode_sof0(MJpegDecodeContext *s)

  817. {

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

  819. 

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

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

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

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

  824.         return -1;

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

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

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

  828. 

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

  830.     if (nb_components <= 0 ||

  831.         nb_components > MAX_COMPONENTS)

  832.         return -1;

  833.     s->nb_components = nb_components;

  834.     s->h_max = 1;

  835.     s->v_max = 1;

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

  837.         /* component id */

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

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

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

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

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

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

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

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

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

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

  848.             return -1;

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

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

  851.     }

  852. 

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

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

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

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

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

  858.         s->width = width;

  859.         s->height = height;

  860.         /* test interlaced mode */

  861.         if (s->first_picture &&

  862.             s->org_height != 0 &&

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

  864.             s->interlaced = 1;

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

  866. 	    s->bottom_field = 0;

  867.         }

  868. 

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

  870.             int w, h;

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

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

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

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

  875.             if (s->interlaced)

  876.                 w *= 2;

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

  878.             /* memory test is done in mjpeg_decode_sos() */

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

  880.         }

  881.         s->first_picture = 0;

  882.     }

  883. 

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

  885.     {

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

  887.     }

  888.     

  889.     return 0;

  890. }

  891. 

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

  893. {

  894.     int code, diff;

  895. #if 1

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

  897. #else

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

  899. #endif

  900.     if (code < 0)

  901.     {

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

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

  904.         return 0xffff;

  905.     }

  906.     if (code == 0) {

  907.         diff = 0;

  908.     } else {

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

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

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

  912.     }

  913.     return diff;

  914. }

  915. 

  916. /* decode block and dequantize */

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

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

  919. {

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

  921.     int run, val;

  922.     VLC *ac_vlc;

  923.     INT16 *quant_matrix;

  924. 

  925.     /* DC coef */

  926.     val = mjpeg_decode_dc(s, dc_index);

  927.     if (val == 0xffff) {

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

  929.         return -1;

  930.     }

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

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

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

  934.     block[0] = val;

  935.     /* AC coefs */

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

  937.     i = 1;

  938.     for(;;) {

  939. #if 1

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

  941. #else

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

  943. #endif

  944.         if (code < 0) {

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

  946.             return -1;

  947.         }

  948.         /* EOB */

  949.         if (code == 0)

  950.             break;

  951.         if (code == 0xf0) {

  952.             i += 16;

  953.         } else {

  954.             run = code >> 4;

  955.             nbits = code & 0xf;

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

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

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

  959.             i += run;

  960.             if (i >= 64) {

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

  962.                 return -1;

  963.             }

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

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

  966.             i++;

  967.             if (i >= 64)

  968.                 break;

  969.         }

  970.     }

  971.     return 0;

  972. }

  973. 

  974. static int mjpeg_decode_sos(MJpegDecodeContext *s)

  975. {

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

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

  978.     int comp_index[4];

  979.     int dc_index[4];

  980.     int ac_index[4];

  981.     int nb_blocks[4];

  982.     int h_count[4];

  983.     int v_count[4];

  984.     

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

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

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

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

  989.     {

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

  991. 	return -1;

  992.     }

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

  994.     if (nb_components != 3)

  995.     {

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

  997.         return -1;

  998.     }

  999.     vmax = 0;

  1000.     hmax = 0;

  1001.     for(i=0;i<nb_components;i++) {

  1002.         id = get_bits(&s->gb, 8) - 1;

  1003. 	dprintf("component: %d\n", id);

  1004.         /* find component index */

  1005.         for(index=0;index<s->nb_components;index++)

  1006.             if (id == s->component_id[index])

  1007.                 break;

  1008.         if (index == s->nb_components)

  1009. 	{

  1010. 	    dprintf("decode_sos: index(%d) out of components\n", index);

  1011.             return -1;

  1012. 	}

  1013. 

  1014.         comp_index[i] = index;

  1015.         nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1016.         h_count[i] = s->h_count[index];

  1017.         v_count[i] = s->v_count[index];

  1018. 

  1019.         dc_index[i] = get_bits(&s->gb, 4);

  1020.         ac_index[i] = get_bits(&s->gb, 4);

  1021. 

  1022. 	if (dc_index[i] < 0 || ac_index[i] < 0 ||

  1023. 	    dc_index[i] >= 4 || ac_index[i] >= 4)

  1024. 	    goto out_of_range;

  1025. 	switch(s->start_code)

  1026. 	{

  1027. 	    case SOF0:

  1028. 		if (dc_index[i] > 1 || ac_index[i] > 1)

  1029. 		    goto out_of_range;

  1030. 		break;

  1031. 	    case SOF1:

  1032. 	    case SOF2:

  1033. 		if (dc_index[i] > 3 || ac_index[i] > 3)

  1034. 		    goto out_of_range;

  1035. 		break;

  1036. 	    case SOF3:

  1037. 		if (dc_index[i] > 3 || ac_index[i] != 0)

  1038. 		    goto out_of_range;

  1039. 		break;	

  1040. 	}

  1041.     }

  1042.     skip_bits(&s->gb, 8); /* Ss */

  1043.     skip_bits(&s->gb, 8); /* Se */

  1044.     skip_bits(&s->gb, 8); /* Ah and Al (each are 4 bits) */

  1045. 

  1046.     for(i=0;i<nb_components;i++) 

  1047.         s->last_dc[i] = 1024;

  1048. 

  1049.     if (nb_components > 1) {

  1050.         /* interleaved stream */

  1051.         mb_width = (s->width + s->h_max * 8 - 1) / (s->h_max * 8);

  1052.         mb_height = (s->height + s->v_max * 8 - 1) / (s->v_max * 8);

  1053.     } else {

  1054.         h = s->h_max / s->h_count[comp_index[0]];

  1055.         v = s->v_max / s->v_count[comp_index[0]];

  1056.         mb_width = (s->width + h * 8 - 1) / (h * 8);

  1057.         mb_height = (s->height + v * 8 - 1) / (v * 8);

  1058.         nb_blocks[0] = 1;

  1059.         h_count[0] = 1;

  1060.         v_count[0] = 1;

  1061.     }

  1062. 

  1063.     for(mb_y = 0; mb_y < mb_height; mb_y++) {

  1064.         for(mb_x = 0; mb_x < mb_width; mb_x++) {

  1065.             for(i=0;i<nb_components;i++) {

  1066.                 UINT8 *ptr;

  1067.                 int x, y, c;

  1068.                 n = nb_blocks[i];

  1069.                 c = comp_index[i];

  1070.                 h = h_count[i];

  1071.                 v = v_count[i];

  1072.                 x = 0;

  1073.                 y = 0;

  1074. 		if (s->restart_interval && !s->restart_count)

  1075. 		    s->restart_count = s->restart_interval;

  1076.                 for(j=0;j<n;j++) {

  1077.                     memset(s->block, 0, sizeof(s->block));

  1078.                     if (decode_block(s, s->block, i, 

  1079.                                      dc_index[i], ac_index[i], 

  1080.                                      s->quant_index[c]) < 0) {

  1081.                         dprintf("error y=%d x=%d\n", mb_y, mb_x);

  1082.                         ret = -1;

  1083.                         goto the_end;

  1084.                     }

  1085. //		    dprintf("mb: %d %d processed\n", mb_y, mb_x);

  1086.                     ptr = s->current_picture[c] + 

  1087.                         (s->linesize[c] * (v * mb_y + y) * 8) + 

  1088.                         (h * mb_x + x) * 8;

  1089.                     if (s->interlaced && s->bottom_field)

  1090.                         ptr += s->linesize[c] >> 1;

  1091.                     s->idct_put(ptr, s->linesize[c], s->block);

  1092.                     if (++x == h) {

  1093.                         x = 0;

  1094.                         y++;

  1095.                     }

  1096.                 }

  1097.             }

  1098. 	    /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

  1099. 	    

  1100.             if ((s->restart_interval < 1350) && !--s->restart_count) {

  1101.                 align_get_bits(&s->gb);

  1102.                 skip_bits(&s->gb, 16); /* skip RSTn */

  1103.                 for (j=0; j<nb_components; j++) /* reset dc */

  1104.                     s->last_dc[j] = 1024;

  1105.             }

  1106.         }

  1107.     }

  1108.     ret = 0;

  1109.  the_end:

  1110.     emms_c();

  1111.     return ret;

  1112.  out_of_range:

  1113.     dprintf("decode_sos: ac/dc index out of range\n");

  1114.     return -1;

  1115. }

  1116. 

  1117. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1118. {

  1119.     if (get_bits(&s->gb, 16) != 4)

  1120. 	return -1;

  1121.     s->restart_interval = get_bits(&s->gb, 16);

  1122.     dprintf("restart interval: %d\n", s->restart_interval);

  1123. 

  1124.     return 0;

  1125. }

  1126. 

  1127. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1128. {

  1129.     int len, id;

  1130. 

  1131.     /* XXX: verify len field validity */

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

  1133.     if (len < 5)

  1134. 	return -1;

  1135. 

  1136.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1137.     id = be2me_32(id);

  1138.     len -= 6;

  1139. 

  1140.     /* buggy AVID, it puts EOI only at every 10th frame */

  1141.     /* also this fourcc is used by non-avid files too, it holds some

  1142.        informations, but it's always present in AVID creates files */

  1143.     if (id == ff_get_fourcc("AVI1"))

  1144.     {

  1145. 	/* structure:

  1146. 	    4bytes	AVI1

  1147. 	    1bytes	polarity

  1148. 	    1bytes	always zero

  1149. 	    4bytes	field_size

  1150. 	    4bytes	field_size_less_padding

  1151. 	*/

  1152.     	s->buggy_avid = 1;

  1153. //	if (s->first_picture)

  1154. //	    printf("mjpeg: workarounding buggy AVID\n");

  1155. 	s->interlace_polarity = get_bits(&s->gb, 8);

  1156. #if 0

  1157. 	skip_bits(&s->gb, 8);

  1158. 	skip_bits(&s->gb, 32);

  1159. 	skip_bits(&s->gb, 32);

  1160. 	len -= 10;

  1161. #endif

  1162. //	if (s->interlace_polarity)

  1163. //	    printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1164. 	goto out;

  1165.     }

  1166.     

  1167. //    len -= 2;

  1168.     

  1169.     if (id == ff_get_fourcc("JFIF"))

  1170.     {

  1171. 	int t_w, t_h;

  1172. 	skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1173. 	printf("mjpeg: JFIF header found (version: %x.%x)\n",

  1174. 	    get_bits(&s->gb, 8), get_bits(&s->gb, 8));

  1175. 	if (get_bits(&s->gb, 8) == 0)

  1176. 	{

  1177. 	    s->avctx->aspect_ratio_info = FF_ASPECT_EXTENDED;

  1178. 	    s->avctx->aspected_width = get_bits(&s->gb, 16);

  1179. 	    s->avctx->aspected_height = get_bits(&s->gb, 16);

  1180. 	}

  1181. 	else

  1182. 	{

  1183. 	    skip_bits(&s->gb, 16);

  1184. 	    skip_bits(&s->gb, 16);

  1185. 	}

  1186. 	t_w = get_bits(&s->gb, 8);

  1187. 	t_h = get_bits(&s->gb, 8);

  1188. 	if (t_w && t_h)

  1189. 	{

  1190. 	    /* skip thumbnail */

  1191. 	    if (len-10-(t_w*t_h*3) > 0)

  1192. 		len -= t_w*t_h*3;

  1193. 	}

  1194. 	len -= 10;

  1195. 	goto out;

  1196.     }

  1197.     

  1198.     if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1199.     {

  1200. 	printf("mjpeg: Adobe header found\n");

  1201. 	skip_bits(&s->gb, 16); /* version */

  1202. 	skip_bits(&s->gb, 16); /* flags0 */

  1203. 	skip_bits(&s->gb, 16); /* flags1 */

  1204. 	skip_bits(&s->gb, 8); /* transform */

  1205. 	len -= 7;

  1206. 	goto out;

  1207.     }

  1208.     

  1209.     /* Apple MJPEG-A */

  1210.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1211.     {

  1212. 	id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1213. 	id = be2me_32(id);

  1214. 	len -= 4;

  1215. 	if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */

  1216. 	{

  1217. #if 0

  1218. 	    skip_bits(&s->gb, 32); /* field size */

  1219. 	    skip_bits(&s->gb, 32); /* pad field size */

  1220. 	    skip_bits(&s->gb, 32); /* next off */

  1221. 	    skip_bits(&s->gb, 32); /* quant off */

  1222. 	    skip_bits(&s->gb, 32); /* huff off */

  1223. 	    skip_bits(&s->gb, 32); /* image off */

  1224. 	    skip_bits(&s->gb, 32); /* scan off */

  1225. 	    skip_bits(&s->gb, 32); /* data off */

  1226. #endif

  1227. 	    if (s->first_picture)

  1228. 		printf("mjpeg: Apple MJPEG-A header found\n");

  1229. 	}

  1230.     }

  1231. 

  1232. out:

  1233.     /* slow but needed for extreme adobe jpegs */

  1234.     if (len < 0)

  1235. 	printf("mjpeg: error, decode_app parser read over the end\n");

  1236.     while(--len > 0)

  1237. 	skip_bits(&s->gb, 8);

  1238. 

  1239.     return 0;

  1240. }

  1241. 

  1242. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1243. {

  1244.     int len, i;

  1245.     UINT8 *cbuf;

  1246. 

  1247.     /* XXX: verify len field validity */

  1248.     len = get_bits(&s->gb, 16)-2;

  1249.     cbuf = av_malloc(len+1);

  1250. 

  1251.     for (i = 0; i < len; i++)

  1252. 	cbuf[i] = get_bits(&s->gb, 8);

  1253.     if (cbuf[i-1] == '\n')

  1254. 	cbuf[i-1] = 0;

  1255.     else

  1256. 	cbuf[i] = 0;

  1257. 

  1258.     printf("mjpeg comment: '%s'\n", cbuf);

  1259. 

  1260.     /* buggy avid, it puts EOI only at every 10th frame */

  1261.     if (!strcmp(cbuf, "AVID"))

  1262.     {

  1263. 	s->buggy_avid = 1;

  1264. //	if (s->first_picture)

  1265. //	    printf("mjpeg: workarounding buggy AVID\n");

  1266.     }

  1267.     

  1268.     av_free(cbuf);

  1269. 

  1270.     return 0;

  1271. }

  1272. 

  1273. #if 0

  1274. static int valid_marker_list[] =

  1275. {

  1276.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1277. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1278. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1279. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1280. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1281. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1282. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1283. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1284. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1285. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1286. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1287. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1288. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1289. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1290. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1291. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1292. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1293. }

  1294. #endif

  1295. 

  1296. /* return the 8 bit start code value and update the search

  1297.    state. Return -1 if no start code found */

  1298. static int find_marker(UINT8 **pbuf_ptr, UINT8 *buf_end)

  1299. {

  1300.     UINT8 *buf_ptr;

  1301.     unsigned int v, v2;

  1302.     int val;

  1303. #ifdef DEBUG

  1304.     int skipped=0;

  1305. #endif

  1306. 

  1307.     buf_ptr = *pbuf_ptr;

  1308.     while (buf_ptr < buf_end) {

  1309.         v = *buf_ptr++;

  1310. 	v2 = *buf_ptr;

  1311.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {

  1312. 	    val = *buf_ptr++;

  1313. 	    goto found;

  1314.         }

  1315. #ifdef DEBUG

  1316. 	skipped++;

  1317. #endif

  1318.     }

  1319.     val = -1;

  1320. found:

  1321. #ifdef DEBUG

  1322.     dprintf("find_marker skipped %d bytes\n", skipped);

  1323. #endif

  1324.     *pbuf_ptr = buf_ptr;

  1325.     return val;

  1326. }

  1327. 

  1328. static int mjpeg_decode_frame(AVCodecContext *avctx, 

  1329.                               void *data, int *data_size,

  1330.                               UINT8 *buf, int buf_size)

  1331. {

  1332.     MJpegDecodeContext *s = avctx->priv_data;

  1333.     UINT8 *buf_end, *buf_ptr;

  1334.     int i, start_code;

  1335.     AVPicture *picture = data;

  1336. 

  1337.     *data_size = 0;

  1338. 

  1339.     /* no supplementary picture */

  1340.     if (buf_size == 0)

  1341.         return 0;

  1342. 

  1343.     buf_ptr = buf;

  1344.     buf_end = buf + buf_size;

  1345.     while (buf_ptr < buf_end) {

  1346.         /* find start next marker */

  1347.         start_code = find_marker(&buf_ptr, buf_end);

  1348. 	{

  1349. 	    /* EOF */

  1350.             if (start_code < 0) {

  1351. 		goto the_end;

  1352.             } else {

  1353.                 dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);

  1354. 		

  1355. 		if ((buf_end - buf_ptr) > s->buffer_size)

  1356. 		{

  1357. 		    av_free(s->buffer);

  1358. 		    s->buffer_size = buf_end-buf_ptr;

  1359. 		    s->buffer = av_malloc(s->buffer_size);

  1360. 		    dprintf("buffer too small, expanding to %d bytes\n",

  1361. 			s->buffer_size);

  1362. 		}

  1363. 		

  1364. 		/* unescape buffer of SOS */

  1365. 		if (start_code == SOS)

  1366. 		{

  1367. 		    UINT8 *src = buf_ptr;

  1368. 		    UINT8 *dst = s->buffer;

  1369. 

  1370. 		    while (src<buf_end)

  1371. 		    {

  1372. 			UINT8 x = *(src++);

  1373. 

  1374. #if 0

  1375. 			if (x == 0xff && *src == 0xff)

  1376. 			    break;

  1377. #endif

  1378. 			*(dst++) = x;

  1379. 			if (x == 0xff)

  1380. 			{

  1381. 			    while(*src == 0xff) src++;

  1382. 

  1383. 			    x = *(src++);

  1384. 			    if (x >= 0xd0 && x <= 0xd7)

  1385. 				*(dst++) = x;

  1386. 			    else if (x)

  1387. 				break;

  1388. 			}

  1389. 		    }

  1390. 		    init_get_bits(&s->gb, s->buffer, dst - s->buffer);

  1391. 		    

  1392. 		    dprintf("escaping removed %d bytes\n",

  1393. 			(buf_end - buf_ptr) - (dst - s->buffer));

  1394. 		}

  1395. 		else

  1396. 		    init_get_bits(&s->gb, buf_ptr, buf_end - buf_ptr);

  1397. 		

  1398. 		s->start_code = start_code;

  1399. 

  1400. 		/* process markers */

  1401. 		if (start_code >= 0xd0 && start_code <= 0xd7) {

  1402. 		    dprintf("restart marker: %d\n", start_code&0x0f);

  1403. 		} else if (s->first_picture) {

  1404. 		    /* APP fields */

  1405. 		    if (start_code >= 0xe0 && start_code <= 0xef)

  1406. 			mjpeg_decode_app(s);

  1407. 		    /* Comment */

  1408. 		    else if (start_code == COM)

  1409. 			mjpeg_decode_com(s);

  1410. 		}

  1411. 

  1412.                 switch(start_code) {

  1413.                 case SOI:

  1414. 		    s->restart_interval = 0;

  1415.                     /* nothing to do on SOI */

  1416.                     break;

  1417.                 case DQT:

  1418.                     mjpeg_decode_dqt(s);

  1419.                     break;

  1420.                 case DHT:

  1421.                     mjpeg_decode_dht(s);

  1422.                     break;

  1423.                 case SOF0:

  1424.                     mjpeg_decode_sof0(s);

  1425.                     break;

  1426. 		case EOI:

  1427. eoi_parser:

  1428. 		    {

  1429.                         int l;

  1430.                         if (s->interlaced) {

  1431.                             s->bottom_field ^= 1;

  1432.                             /* if not bottom field, do not output image yet */

  1433.                             if (s->bottom_field)

  1434.                                 goto not_the_end;

  1435.                         }

  1436.                         for(i=0;i<3;i++) {

  1437.                             picture->data[i] = s->current_picture[i];

  1438. #if 1

  1439.                             l = s->linesize[i];

  1440.                             if (s->interlaced)

  1441.                                 l >>= 1;

  1442.                             picture->linesize[i] = l;

  1443. #else

  1444. 			    picture->linesize[i] = (s->interlaced) ?

  1445. 				s->linesize[i] >> 1 : s->linesize[i];

  1446. #endif

  1447.                         }

  1448.                         *data_size = sizeof(AVPicture);

  1449.                         avctx->height = s->height;

  1450.                         if (s->interlaced)

  1451.                             avctx->height *= 2;

  1452.                         avctx->width = s->width;

  1453.                         /* XXX: not complete test ! */

  1454.                         switch((s->h_count[0] << 4) | s->v_count[0]) {

  1455.                         case 0x11:

  1456.                             avctx->pix_fmt = PIX_FMT_YUV444P;

  1457.                             break;

  1458.                         case 0x21:

  1459.                             avctx->pix_fmt = PIX_FMT_YUV422P;

  1460.                             break;

  1461.                         default:

  1462.                         case 0x22:

  1463.                             avctx->pix_fmt = PIX_FMT_YUV420P;

  1464.                             break;

  1465.                         }

  1466.                         /* dummy quality */

  1467.                         /* XXX: infer it with matrix */

  1468.                     	avctx->quality = 3; 

  1469.                         goto the_end;

  1470.                     }

  1471. 		    break;

  1472.                 case SOS:

  1473.                     mjpeg_decode_sos(s);

  1474. 		    /* buggy avid puts EOI every 10-20th frame */

  1475. 		    /* if restart period is over process EOI */

  1476. 		    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1477. 			goto eoi_parser;

  1478.                     break;

  1479. 		case DRI:

  1480. 		    mjpeg_decode_dri(s);

  1481. 		    break;

  1482. 		case SOF1:

  1483. 		case SOF2:

  1484. 		case SOF3:

  1485. 		case SOF5:

  1486. 		case SOF6:

  1487. 		case SOF7:

  1488. 		case SOF9:

  1489. 		case SOF10:

  1490. 		case SOF11:

  1491. 		case SOF13:

  1492. 		case SOF14:

  1493. 		case SOF15:

  1494. 		case JPG:

  1495. 		    printf("mjpeg: unsupported coding type (%x)\n", start_code);

  1496. 		    break;

  1497. //		default:

  1498. //		    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1499. //		    break;

  1500.                 }

  1501. 

  1502. not_the_end:

  1503. 		/* eof process start code */

  1504. 		buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1505. 		dprintf("marker parser used %d bytes (%d bits)\n",

  1506. 		    (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1507.             }

  1508.         }

  1509.     }

  1510. the_end:

  1511. 

  1512.     dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);

  1513. //    return buf_end - buf_ptr;

  1514.     return buf_ptr - buf;

  1515. }

  1516. 

  1517. static int mjpeg_decode_end(AVCodecContext *avctx)

  1518. {

  1519.     MJpegDecodeContext *s = avctx->priv_data;

  1520.     int i, j;

  1521. 

  1522.     av_free(s->buffer);

  1523.     for(i=0;i<MAX_COMPONENTS;i++)

  1524.         av_free(s->current_picture[i]);

  1525.     for(i=0;i<2;i++) {

  1526.         for(j=0;j<4;j++)

  1527.             free_vlc(&s->vlcs[i][j]);

  1528.     }

  1529.     return 0;

  1530. }

  1531. 

  1532. AVCodec mjpeg_decoder = {

  1533.     "mjpeg",

  1534.     CODEC_TYPE_VIDEO,

  1535.     CODEC_ID_MJPEG,

  1536.     sizeof(MJpegDecodeContext),

  1537.     mjpeg_decode_init,

  1538.     NULL,

  1539.     mjpeg_decode_end,

  1540.     mjpeg_decode_frame,

  1541.     0,

  1542.     NULL

  1543. };