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FFmpeg/libavcodec/mjpegdec.c

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  1. /*

  2.  * MJPEG decoder

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

  4.  * Copyright (c) 2003 Alex Beregszaszi

  5.  * Copyright (c) 2003-2004 Michael Niedermayer

  6.  *

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

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

  9.  *                                  by Alex Beregszaszi

  10.  *

  11.  * This file is part of FFmpeg.

  12.  *

  13.  * FFmpeg is free software; you can redistribute it and/or

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

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

  16.  * version 2.1 of the License, or (at your option) any later version.

  17.  *

  18.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  21.  * Lesser General Public License for more details.

  22.  *

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

  24.  * License along with FFmpeg; if not, write to the Free Software

  25.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  26.  */

  27. 

  28. /**

  29.  * @file mjpegdec.c

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "avcodec.h"

  37. #include "dsputil.h"

  38. #include "mjpeg.h"

  39. #include "mjpegdec.h"

  40. #include "jpeglsdec.h"

  41. 

  42. 

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

  44.                       int nb_codes, int use_static, int is_ac)

  45. {

  46.     uint8_t huff_size[256+16];

  47.     uint16_t huff_code[256+16];

  48. 

  49.     assert(nb_codes <= 256);

  50. 

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

  52.     ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);

  53. 

  54.     if(is_ac){

  55.         memmove(huff_size+16, huff_size, sizeof(uint8_t)*nb_codes);

  56.         memmove(huff_code+16, huff_code, sizeof(uint16_t)*nb_codes);

  57.         memset(huff_size, 0, sizeof(uint8_t)*16);

  58.         memset(huff_code, 0, sizeof(uint16_t)*16);

  59.         nb_codes += 16;

  60.     }

  61. 

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

  63. }

  64. 

  65. static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {

  66.     build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,

  67.               ff_mjpeg_val_dc_luminance, 12, 0, 0);

  68.     build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,

  69.               ff_mjpeg_val_dc_chrominance, 12, 0, 0);

  70.     build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,

  71.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

  72.     build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,

  73.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

  74. }

  75. 

  76. int ff_mjpeg_decode_init(AVCodecContext *avctx)

  77. {

  78.     MJpegDecodeContext *s = avctx->priv_data;

  79. 

  80.     s->avctx = avctx;

  81.     dsputil_init(&s->dsp, avctx);

  82.     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);

  83.     s->buffer_size = 0;

  84.     s->buffer = NULL;

  85.     s->start_code = -1;

  86.     s->first_picture = 1;

  87.     s->org_height = avctx->coded_height;

  88. 

  89.     build_basic_mjpeg_vlc(s);

  90. 

  91.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  92.     {

  93.         av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");

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

  95.         if (ff_mjpeg_decode_dht(s)) {

  96.             av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");

  97.             build_basic_mjpeg_vlc(s);

  98.         }

  99.     }

  100.     if (avctx->extradata_size > 9 &&

  101.         AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {

  102.         if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */

  103.             s->interlace_polarity = 1; /* bottom field first */

  104.             av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");

  105.         }

  106.     }

  107. 

  108.     return 0;

  109. }

  110. 

  111. 

  112. /* quantize tables */

  113. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  114. {

  115.     int len, index, i, j;

  116. 

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

  118. 

  119.     while (len >= 65) {

  120.         /* only 8 bit precision handled */

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

  122.         {

  123.             av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");

  124.             return -1;

  125.         }

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

  127.         if (index >= 4)

  128.             return -1;

  129.         av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);

  130.         /* read quant table */

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

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

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

  134.         }

  135. 

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

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

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

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

  140.         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);

  141.         len -= 65;

  142.     }

  143. 

  144.     return 0;

  145. }

  146. 

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

  148. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  149. {

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

  151.     uint8_t bits_table[17];

  152.     uint8_t val_table[256];

  153. 

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

  155. 

  156.     while (len > 0) {

  157.         if (len < 17)

  158.             return -1;

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

  160.         if (class >= 2)

  161.             return -1;

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

  163.         if (index >= 4)

  164.             return -1;

  165.         n = 0;

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

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

  168.             n += bits_table[i];

  169.         }

  170.         len -= 17;

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

  172.             return -1;

  173. 

  174.         code_max = 0;

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

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

  177.             if (v > code_max)

  178.                 code_max = v;

  179.             val_table[i] = v;

  180.         }

  181.         len -= n;

  182. 

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

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

  185.         av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",

  186.                class, index, code_max + 1);

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

  188.             return -1;

  189.         }

  190.     }

  191.     return 0;

  192. }

  193. 

  194. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  195. {

  196.     int len, nb_components, i, width, height, pix_fmt_id;

  197. 

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

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

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

  201. 

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

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

  204. 

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

  206.         av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");

  207.         return -1;

  208.     }

  209. 

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

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

  212. 

  213.     //HACK for odd_height.mov

  214.     if(s->interlaced && s->width == width && s->height == height + 1)

  215.         height= s->height;

  216. 

  217.     av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);

  218.     if(avcodec_check_dimensions(s->avctx, width, height))

  219.         return -1;

  220. 

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

  222.     if (nb_components <= 0 ||

  223.         nb_components > MAX_COMPONENTS)

  224.         return -1;

  225.     if (s->ls && !(s->bits <= 8 || nb_components == 1)){

  226.         av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");

  227.         return -1;

  228.     }

  229.     s->nb_components = nb_components;

  230.     s->h_max = 1;

  231.     s->v_max = 1;

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

  233.         /* component id */

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

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

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

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

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

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

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

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

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

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

  244.             return -1;

  245.         av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],

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

  247.     }

  248. 

  249.     if(s->ls && (s->h_max > 1 || s->v_max > 1)) {

  250.         av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");

  251.         return -1;

  252.     }

  253. 

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

  255. 

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

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

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

  259.         av_freep(&s->qscale_table);

  260. 

  261.         s->width = width;

  262.         s->height = height;

  263.         s->interlaced = 0;

  264. 

  265.         /* test interlaced mode */

  266.         if (s->first_picture &&

  267.             s->org_height != 0 &&

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

  269.             s->interlaced = 1;

  270.             s->bottom_field = s->interlace_polarity;

  271.             s->picture.interlaced_frame = 1;

  272.             s->picture.top_field_first = !s->interlace_polarity;

  273.             height *= 2;

  274.         }

  275. 

  276.         avcodec_set_dimensions(s->avctx, width, height);

  277. 

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

  279. 

  280.         s->first_picture = 0;

  281.     }

  282. 

  283.     if(s->interlaced && (s->bottom_field == !s->interlace_polarity))

  284.         return 0;

  285. 

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

  287.     pix_fmt_id = (s->h_count[0] << 20) | (s->v_count[0] << 16) |

  288.                  (s->h_count[1] << 12) | (s->v_count[1] <<  8) |

  289.                  (s->h_count[2] <<  4) |  s->v_count[2];

  290.     av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);

  291.     switch(pix_fmt_id){

  292.     case 0x222222:

  293.     case 0x111111:

  294.         if(s->rgb){

  295.             s->avctx->pix_fmt = PIX_FMT_RGB32;

  296.         }else if(s->nb_components==3)

  297.             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;

  298.         else

  299.             s->avctx->pix_fmt = PIX_FMT_GRAY8;

  300.         break;

  301.     case 0x110000:

  302.         s->avctx->pix_fmt = PIX_FMT_GRAY8;

  303.         break;

  304.     case 0x121111:

  305.         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;

  306.         break;

  307.     case 0x211111:

  308.     case 0x221212:

  309.         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;

  310.         break;

  311.     case 0x221111:

  312.         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;

  313.         break;

  314.     default:

  315.         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);

  316.         return -1;

  317.     }

  318.     if(s->ls){

  319.         if(s->nb_components > 1)

  320.             s->avctx->pix_fmt = PIX_FMT_RGB24;

  321.         else if(s->bits <= 8)

  322.             s->avctx->pix_fmt = PIX_FMT_GRAY8;

  323.         else

  324.             s->avctx->pix_fmt = PIX_FMT_GRAY16;

  325.     }

  326. 

  327.     if(s->picture.data[0])

  328.         s->avctx->release_buffer(s->avctx, &s->picture);

  329. 

  330.     s->picture.reference= 0;

  331.     if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){

  332.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  333.         return -1;

  334.     }

  335.     s->picture.pict_type= I_TYPE;

  336.     s->picture.key_frame= 1;

  337. 

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

  339.         s->linesize[i]= s->picture.linesize[i] << s->interlaced;

  340.     }

  341. 

  342. //    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);

  343. 

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

  345.     {

  346.         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);

  347.     }

  348. 

  349.     /* totally blank picture as progressive JPEG will only add details to it */

  350.     if(s->progressive){

  351.         memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);

  352.         memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));

  353.         memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));

  354.     }

  355.     return 0;

  356. }

  357. 

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

  359. {

  360.     int code;

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

  362.     if (code < 0)

  363.     {

  364.         av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,

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

  366.         return 0xffff;

  367.     }

  368. 

  369.     if(code)

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

  371.     else

  372.         return 0;

  373. }

  374. 

  375. /* decode block and dequantize */

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

  377.                         int component, int dc_index, int ac_index, int16_t *quant_matrix)

  378. {

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

  380. 

  381.     /* DC coef */

  382.     val = mjpeg_decode_dc(s, dc_index);

  383.     if (val == 0xffff) {

  384.         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");

  385.         return -1;

  386.     }

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

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

  389.     block[0] = val;

  390.     /* AC coefs */

  391.     i = 0;

  392.     {OPEN_READER(re, &s->gb)

  393.     for(;;) {

  394.         UPDATE_CACHE(re, &s->gb);

  395.         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)

  396. 

  397.         /* EOB */

  398.         if (code == 0x10)

  399.             break;

  400.         i += ((unsigned)code) >> 4;

  401.         if(code != 0x100){

  402.             code &= 0xf;

  403.             if(code > MIN_CACHE_BITS - 16){

  404.                 UPDATE_CACHE(re, &s->gb)

  405.             }

  406.             {

  407.                 int cache=GET_CACHE(re,&s->gb);

  408.                 int sign=(~cache)>>31;

  409.                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;

  410.             }

  411. 

  412.             LAST_SKIP_BITS(re, &s->gb, code)

  413. 

  414.             if (i >= 63) {

  415.                 if(i == 63){

  416.                     j = s->scantable.permutated[63];

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

  418.                     break;

  419.                 }

  420.                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);

  421.                 return -1;

  422.             }

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

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

  425.         }

  426.     }

  427.     CLOSE_READER(re, &s->gb)}

  428. 

  429.     return 0;

  430. }

  431. 

  432. /* decode block and dequantize - progressive JPEG version */

  433. static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,

  434.                         int component, int dc_index, int ac_index, int16_t *quant_matrix,

  435.                         int ss, int se, int Ah, int Al, int *EOBRUN)

  436. {

  437.     int code, i, j, level, val, run;

  438. 

  439.     /* DC coef */

  440.     if(!ss){

  441.         val = mjpeg_decode_dc(s, dc_index);

  442.         if (val == 0xffff) {

  443.             av_log(s->avctx, AV_LOG_ERROR, "error dc\n");

  444.             return -1;

  445.         }

  446.         val = (val * quant_matrix[0] << Al) + s->last_dc[component];

  447.     }else

  448.         val = 0;

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

  450.     block[0] = val;

  451.     if(!se) return 0;

  452.     /* AC coefs */

  453.     if(*EOBRUN){

  454.         (*EOBRUN)--;

  455.         return 0;

  456.     }

  457.     {OPEN_READER(re, &s->gb)

  458.     for(i=ss;;i++) {

  459.         UPDATE_CACHE(re, &s->gb);

  460.         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)

  461.         /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */

  462.         code -= 16;

  463.         if(code & 0xF) {

  464.             i += ((unsigned) code) >> 4;

  465.             code &= 0xf;

  466.             if(code > MIN_CACHE_BITS - 16){

  467.                 UPDATE_CACHE(re, &s->gb)

  468.             }

  469.             {

  470.                 int cache=GET_CACHE(re,&s->gb);

  471.                 int sign=(~cache)>>31;

  472.                 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;

  473.             }

  474. 

  475.             LAST_SKIP_BITS(re, &s->gb, code)

  476. 

  477.             if (i >= se) {

  478.                 if(i == se){

  479.                     j = s->scantable.permutated[se];

  480.                     block[j] = level * quant_matrix[j] << Al;

  481.                     break;

  482.                 }

  483.                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);

  484.                 return -1;

  485.             }

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

  487.             block[j] = level * quant_matrix[j] << Al;

  488.         }else{

  489.             run = ((unsigned) code) >> 4;

  490.             if(run == 0xF){// ZRL - skip 15 coefficients

  491.                 i += 15;

  492.             }else{

  493.                 val = run;

  494.                 run = (1 << run);

  495.                 UPDATE_CACHE(re, &s->gb);

  496.                 run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);

  497.                 if(val)

  498.                     LAST_SKIP_BITS(re, &s->gb, val);

  499.                 *EOBRUN = run - 1;

  500.                 break;

  501.             }

  502.         }

  503.     }

  504.     CLOSE_READER(re, &s->gb)}

  505. 

  506.     return 0;

  507. }

  508. 

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

  510.     int i, mb_x, mb_y;

  511.     uint16_t buffer[32768][4];

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

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

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

  515. 

  516.     if((unsigned)s->mb_width > 32768) //dynamic alloc

  517.         return -1;

  518. 

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

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

  521.     }

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

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

  524.         uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);

  525. 

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

  527.             ptr += linesize >> 1;

  528. 

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

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

  531.         }

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

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

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

  535. 

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

  537.                 int pred;

  538. 

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

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

  541. 

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

  543. 

  544.                 left[i]=

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

  546.             }

  547. 

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

  549.                 align_get_bits(&s->gb);

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

  551.             }

  552.         }

  553. 

  554.         if(s->rct){

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

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

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

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

  559.             }

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

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

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

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

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

  565.             }

  566.         }else{

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

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

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

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

  571.             }

  572.         }

  573.     }

  574.     return 0;

  575. }

  576. 

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

  578.     int i, mb_x, mb_y;

  579.     const int nb_components=3;

  580. 

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

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

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

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

  585. 

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

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

  588.                     uint8_t *ptr;

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

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

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

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

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

  594.                     x = 0;

  595.                     y = 0;

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

  597. 

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

  599.                         int pred;

  600. 

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

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

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

  604.                                 pred= 128 << point_transform;

  605.                             }else{

  606.                                 pred= ptr[-1];

  607.                             }

  608.                         }else{

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

  610.                                 pred= ptr[-linesize];

  611.                             }else{

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

  613.                             }

  614.                         }

  615. 

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

  617.                             ptr += linesize >> 1;

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

  619. 

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

  621.                             x = 0;

  622.                             y++;

  623.                         }

  624.                     }

  625.                 }

  626.             }else{

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

  628.                     uint8_t *ptr;

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

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

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

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

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

  634.                     x = 0;

  635.                     y = 0;

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

  637. 

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

  639.                         int pred;

  640. 

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

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

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

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

  645.                             x = 0;

  646.                             y++;

  647.                         }

  648.                     }

  649.                 }

  650.             }

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

  652.                 align_get_bits(&s->gb);

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

  654.             }

  655.         }

  656.     }

  657.     return 0;

  658. }

  659. 

  660. static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, int se, int Ah, int Al){

  661.     int i, mb_x, mb_y;

  662.     int EOBRUN = 0;

  663. 

  664.     if(Ah) return 0; /* TODO decode refinement planes too */

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

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

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

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

  669. 

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

  671.                 uint8_t *ptr;

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

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

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

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

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

  677.                 x = 0;

  678.                 y = 0;

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

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

  681.                     if (!s->progressive && decode_block(s, s->block, i,

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

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

  684.                         av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);

  685.                         return -1;

  686.                     }

  687.                     if (s->progressive && decode_block_progressive(s, s->block, i,

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

  689.                                      s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {

  690.                         av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);

  691.                         return -1;

  692.                     }

  693. //                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);

  694.                     ptr = s->picture.data[c] +

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

  696.                         (h * mb_x + x) * 8) >> s->avctx->lowres);

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

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

  699. //av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);

  700.                     if(!s->progressive)

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

  702.                     else

  703.                         s->dsp.idct_add(ptr, s->linesize[c], s->block);

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

  705.                         x = 0;

  706.                         y++;

  707.                     }

  708.                 }

  709.             }

  710.             /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

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

  712.                 !--s->restart_count) {

  713.                 align_get_bits(&s->gb);

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

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

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

  717.             }

  718.         }

  719.     }

  720.     return 0;

  721. }

  722. 

  723. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  724. {

  725.     int len, nb_components, i, h, v, predictor, point_transform;

  726.     int vmax, hmax, index, id;

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

  728.     int ilv, prev_shift;

  729. 

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

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

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

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

  734.     {

  735.         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);

  736.         return -1;

  737.     }

  738.     vmax = 0;

  739.     hmax = 0;

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

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

  742.         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);

  743.         /* find component index */

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

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

  746.                 break;

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

  748.         {

  749.             av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);

  750.             return -1;

  751.         }

  752. 

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

  754. 

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

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

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

  758. 

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

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

  761. 

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

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

  764.             goto out_of_range;

  765. #if 0 //buggy

  766.         switch(s->start_code)

  767.         {

  768.             case SOF0:

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

  770.                     goto out_of_range;

  771.                 break;

  772.             case SOF1:

  773.             case SOF2:

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

  775.                     goto out_of_range;

  776.                 break;

  777.             case SOF3:

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

  779.                     goto out_of_range;

  780.                 break;

  781.         }

  782. #endif

  783.     }

  784. 

  785.     predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */

  786.     ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */

  787.     prev_shift = get_bits(&s->gb, 4); /* Ah */

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

  789. 

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

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

  792. 

  793.     if (nb_components > 1) {

  794.         /* interleaved stream */

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

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

  797.     } else if(!s->ls) { /* skip this for JPEG-LS */

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

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

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

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

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

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

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

  805.     }

  806. 

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

  808.         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "",

  809.                predictor, point_transform, ilv, s->bits,

  810.                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));

  811. 

  812. 

  813.     /* mjpeg-b can have padding bytes between sos and image data, skip them */

  814.     for (i = s->mjpb_skiptosod; i > 0; i--)

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

  816. 

  817.     if(s->lossless){

  818.         if(ENABLE_JPEGLS_DECODER && s->ls){

  819. //            for(){

  820. //            reset_ls_coding_parameters(s, 0);

  821. 

  822.             ff_jpegls_decode_picture(s, predictor, point_transform, ilv);

  823.         }else{

  824.             if(s->rgb){

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

  826.                     return -1;

  827.             }else{

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

  829.                     return -1;

  830.             }

  831.         }

  832.     }else{

  833.         if(mjpeg_decode_scan(s, nb_components, predictor, ilv, prev_shift, point_transform) < 0)

  834.             return -1;

  835.     }

  836.     emms_c();

  837.     return 0;

  838.  out_of_range:

  839.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  840.     return -1;

  841. }

  842. 

  843. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  844. {

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

  846.         return -1;

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

  848.     s->restart_count = 0;

  849.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  850. 

  851.     return 0;

  852. }

  853. 

  854. static int mjpeg_decode_app(MJpegDecodeContext *s)

  855. {

  856.     int len, id, i;

  857. 

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

  859.     if (len < 5)

  860.         return -1;

  861.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  862.         return -1;

  863. 

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

  865.     id = be2me_32(id);

  866.     len -= 6;

  867. 

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

  869.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  870.     }

  871. 

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

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

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

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

  876.     {

  877.         /* structure:

  878.             4bytes      AVI1

  879.             1bytes      polarity

  880.             1bytes      always zero

  881.             4bytes      field_size

  882.             4bytes      field_size_less_padding

  883.         */

  884.             s->buggy_avid = 1;

  885. //        if (s->first_picture)

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

  887.         i = get_bits(&s->gb, 8);

  888.         if     (i==2) s->bottom_field= 1;

  889.         else if(i==1) s->bottom_field= 0;

  890. #if 0

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

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

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

  894.         len -= 10;

  895. #endif

  896. //        if (s->interlace_polarity)

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

  898.         goto out;

  899.     }

  900. 

  901. //    len -= 2;

  902. 

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

  904.     {

  905.         int t_w, t_h, v1, v2;

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

  907.         v1= get_bits(&s->gb, 8);

  908.         v2= get_bits(&s->gb, 8);

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

  910. 

  911.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  912.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  913. 

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

  915.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  916.                 v1, v2,

  917.                 s->avctx->sample_aspect_ratio.num,

  918.                 s->avctx->sample_aspect_ratio.den

  919.             );

  920. 

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

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

  923.         if (t_w && t_h)

  924.         {

  925.             /* skip thumbnail */

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

  927.                 len -= t_w*t_h*3;

  928.         }

  929.         len -= 10;

  930.         goto out;

  931.     }

  932. 

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

  934.     {

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

  936.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

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

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

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

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

  941.         len -= 7;

  942.         goto out;

  943.     }

  944. 

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

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

  947.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

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

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

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

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

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

  953.         case 1:

  954.             s->rgb= 1;

  955.             s->pegasus_rct=0;

  956.             break;

  957.         case 2:

  958.             s->rgb= 1;

  959.             s->pegasus_rct=1;

  960.             break;

  961.         default:

  962.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  963.         }

  964.         len -= 9;

  965.         goto out;

  966.     }

  967. 

  968.     /* Apple MJPEG-A */

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

  970.     {

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

  972.         id = be2me_32(id);

  973.         len -= 4;

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

  975.         {

  976. #if 0

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

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

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

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

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

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

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

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

  985. #endif

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

  987.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  988.         }

  989.     }

  990. 

  991. out:

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

  993.     if (len < 0)

  994.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  995.     while(--len > 0)

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

  997. 

  998.     return 0;

  999. }

  1000. 

  1001. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1002. {

  1003.     int len = get_bits(&s->gb, 16);

  1004.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1005.         char *cbuf = av_malloc(len - 1);

  1006.         if (cbuf) {

  1007.             int i;

  1008.             for (i = 0; i < len - 2; i++)

  1009.                 cbuf[i] = get_bits(&s->gb, 8);

  1010.             if (i > 0 && cbuf[i-1] == '\n')

  1011.                 cbuf[i-1] = 0;

  1012.             else

  1013.                 cbuf[i] = 0;

  1014. 

  1015.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1016.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1017. 

  1018.             /* buggy avid, it puts EOI only at every 10th frame */

  1019.             if (!strcmp(cbuf, "AVID"))

  1020.             {

  1021.                 s->buggy_avid = 1;

  1022.                 //        if (s->first_picture)

  1023.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1024.             }

  1025.             else if(!strcmp(cbuf, "CS=ITU601")){

  1026.                 s->cs_itu601= 1;

  1027.             }

  1028. 

  1029.             av_free(cbuf);

  1030.         }

  1031.     }

  1032. 

  1033.     return 0;

  1034. }

  1035. 

  1036. #if 0

  1037. static int valid_marker_list[] =

  1038. {

  1039.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1040. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1041. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1042. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1043. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1044. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1045. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1046. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1047. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1048. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1049. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1050. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1051. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1052. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1053. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1054. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1055. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1056. }

  1057. #endif

  1058. 

  1059. /* return the 8 bit start code value and update the search

  1060.    state. Return -1 if no start code found */

  1061. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1062. {

  1063.     uint8_t *buf_ptr;

  1064.     unsigned int v, v2;

  1065.     int val;

  1066. #ifdef DEBUG

  1067.     int skipped=0;

  1068. #endif

  1069. 

  1070.     buf_ptr = *pbuf_ptr;

  1071.     while (buf_ptr < buf_end) {

  1072.         v = *buf_ptr++;

  1073.         v2 = *buf_ptr;

  1074.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1075.             val = *buf_ptr++;

  1076.             goto found;

  1077.         }

  1078. #ifdef DEBUG

  1079.         skipped++;

  1080. #endif

  1081.     }

  1082.     val = -1;

  1083. found:

  1084. #ifdef DEBUG

  1085.     av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);

  1086. #endif

  1087.     *pbuf_ptr = buf_ptr;

  1088.     return val;

  1089. }

  1090. 

  1091. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1092.                               void *data, int *data_size,

  1093.                               uint8_t *buf, int buf_size)

  1094. {

  1095.     MJpegDecodeContext *s = avctx->priv_data;

  1096.     uint8_t *buf_end, *buf_ptr;

  1097.     int start_code;

  1098.     AVFrame *picture = data;

  1099. 

  1100.     buf_ptr = buf;

  1101.     buf_end = buf + buf_size;

  1102.     while (buf_ptr < buf_end) {

  1103.         /* find start next marker */

  1104.         start_code = find_marker(&buf_ptr, buf_end);

  1105.         {

  1106.             /* EOF */

  1107.             if (start_code < 0) {

  1108.                 goto the_end;

  1109.             } else {

  1110.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1111. 

  1112.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1113.                 {

  1114.                     av_free(s->buffer);

  1115.                     s->buffer_size = buf_end-buf_ptr;

  1116.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1117.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1118.                         s->buffer_size);

  1119.                 }

  1120. 

  1121.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1122.                 if (start_code == SOS && !s->ls)

  1123.                 {

  1124.                     uint8_t *src = buf_ptr;

  1125.                     uint8_t *dst = s->buffer;

  1126. 

  1127.                     while (src<buf_end)

  1128.                     {

  1129.                         uint8_t x = *(src++);

  1130. 

  1131.                         *(dst++) = x;

  1132.                         if (avctx->codec_id != CODEC_ID_THP)

  1133.                         {

  1134.                             if (x == 0xff) {

  1135.                                 while (src < buf_end && x == 0xff)

  1136.                                     x = *(src++);

  1137. 

  1138.                                 if (x >= 0xd0 && x <= 0xd7)

  1139.                                     *(dst++) = x;

  1140.                                 else if (x)

  1141.                                     break;

  1142.                             }

  1143.                         }

  1144.                     }

  1145.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1146. 

  1147.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1148.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1149.                 }

  1150.                 else if(start_code == SOS && s->ls){

  1151.                     uint8_t *src = buf_ptr;

  1152.                     uint8_t *dst = s->buffer;

  1153.                     int bit_count = 0;

  1154.                     int t = 0, b = 0;

  1155.                     PutBitContext pb;

  1156. 

  1157.                     s->cur_scan++;

  1158. 

  1159.                     /* find marker */

  1160.                     while (src + t < buf_end){

  1161.                         uint8_t x = src[t++];

  1162.                         if (x == 0xff){

  1163.                             while((src + t < buf_end) && x == 0xff)

  1164.                                 x = src[t++];

  1165.                             if (x & 0x80) {

  1166.                                 t -= 2;

  1167.                                 break;

  1168.                             }

  1169.                         }

  1170.                     }

  1171.                     bit_count = t * 8;

  1172. 

  1173.                     init_put_bits(&pb, dst, t);

  1174. 

  1175.                     /* unescape bitstream */

  1176.                     while(b < t){

  1177.                         uint8_t x = src[b++];

  1178.                         put_bits(&pb, 8, x);

  1179.                         if(x == 0xFF){

  1180.                             x = src[b++];

  1181.                             put_bits(&pb, 7, x);

  1182.                             bit_count--;

  1183.                         }

  1184.                     }

  1185.                     flush_put_bits(&pb);

  1186. 

  1187.                     init_get_bits(&s->gb, dst, bit_count);

  1188.                 }

  1189.                 else

  1190.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1191. 

  1192.                 s->start_code = start_code;

  1193.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1194.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1195.                 }

  1196. 

  1197.                 /* process markers */

  1198.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1199.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1200.                     /* APP fields */

  1201.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1202.                     mjpeg_decode_app(s);

  1203.                     /* Comment */

  1204.                 } else if (start_code == COM){

  1205.                     mjpeg_decode_com(s);

  1206.                 }

  1207. 

  1208.                 switch(start_code) {

  1209.                 case SOI:

  1210.                     s->restart_interval = 0;

  1211. 

  1212.                     s->restart_count = 0;

  1213.                     /* nothing to do on SOI */

  1214.                     break;

  1215.                 case DQT:

  1216.                     ff_mjpeg_decode_dqt(s);

  1217.                     break;

  1218.                 case DHT:

  1219.                     if(ff_mjpeg_decode_dht(s) < 0){

  1220.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1221.                         return -1;

  1222.                     }

  1223.                     break;

  1224.                 case SOF0:

  1225.                     s->lossless=0;

  1226.                     s->ls=0;

  1227.                     s->progressive=0;

  1228.                     if (ff_mjpeg_decode_sof(s) < 0)

  1229.                         return -1;

  1230.                     break;

  1231.                 case SOF2:

  1232.                     s->lossless=0;

  1233.                     s->ls=0;

  1234.                     s->progressive=1;

  1235.                     if (ff_mjpeg_decode_sof(s) < 0)

  1236.                         return -1;

  1237.                     break;

  1238.                 case SOF3:

  1239.                     s->lossless=1;

  1240.                     s->ls=0;

  1241.                     s->progressive=0;

  1242.                     if (ff_mjpeg_decode_sof(s) < 0)

  1243.                         return -1;

  1244.                     break;

  1245.                 case SOF48:

  1246.                     s->lossless=1;

  1247.                     s->ls=1;

  1248.                     s->progressive=0;

  1249.                     if (ff_mjpeg_decode_sof(s) < 0)

  1250.                         return -1;

  1251.                     break;

  1252.                 case LSE:

  1253.                     if (!ENABLE_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1254.                         return -1;

  1255.                     break;

  1256.                 case EOI:

  1257.                     s->cur_scan = 0;

  1258.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1259.                         break;

  1260. eoi_parser:

  1261.                     {

  1262.                         if (s->interlaced) {

  1263.                             s->bottom_field ^= 1;

  1264.                             /* if not bottom field, do not output image yet */

  1265.                             if (s->bottom_field == !s->interlace_polarity)

  1266.                                 goto not_the_end;

  1267.                         }

  1268.                         *picture = s->picture;

  1269.                         *data_size = sizeof(AVFrame);

  1270. 

  1271.                         if(!s->lossless){

  1272.                             picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);

  1273.                             picture->qstride= 0;

  1274.                             picture->qscale_table= s->qscale_table;

  1275.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1276.                             if(avctx->debug & FF_DEBUG_QP)

  1277.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1278.                             picture->quality*= FF_QP2LAMBDA;

  1279.                         }

  1280. 

  1281.                         goto the_end;

  1282.                     }

  1283.                     break;

  1284.                 case SOS:

  1285.                     ff_mjpeg_decode_sos(s);

  1286.                     /* buggy avid puts EOI every 10-20th frame */

  1287.                     /* if restart period is over process EOI */

  1288.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1289.                         goto eoi_parser;

  1290.                     break;

  1291.                 case DRI:

  1292.                     mjpeg_decode_dri(s);

  1293.                     break;

  1294.                 case SOF1:

  1295.                 case SOF5:

  1296.                 case SOF6:

  1297.                 case SOF7:

  1298.                 case SOF9:

  1299.                 case SOF10:

  1300.                 case SOF11:

  1301.                 case SOF13:

  1302.                 case SOF14:

  1303.                 case SOF15:

  1304.                 case JPG:

  1305.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1306.                     break;

  1307. //                default:

  1308. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1309. //                    break;

  1310.                 }

  1311. 

  1312. not_the_end:

  1313.                 /* eof process start code */

  1314.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1315.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1316.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1317.             }

  1318.         }

  1319.     }

  1320. the_end:

  1321.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1322. //    return buf_end - buf_ptr;

  1323.     return buf_ptr - buf;

  1324. }

  1325. 

  1326. int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1327. {

  1328.     MJpegDecodeContext *s = avctx->priv_data;

  1329.     int i, j;

  1330. 

  1331.     av_free(s->buffer);

  1332.     av_free(s->qscale_table);

  1333. 

  1334.     for(i=0;i<2;i++) {

  1335.         for(j=0;j<4;j++)

  1336.             free_vlc(&s->vlcs[i][j]);

  1337.     }

  1338.     return 0;

  1339. }

  1340. 

  1341. AVCodec mjpeg_decoder = {

  1342.     "mjpeg",

  1343.     CODEC_TYPE_VIDEO,

  1344.     CODEC_ID_MJPEG,

  1345.     sizeof(MJpegDecodeContext),

  1346.     ff_mjpeg_decode_init,

  1347.     NULL,

  1348.     ff_mjpeg_decode_end,

  1349.     ff_mjpeg_decode_frame,

  1350.     CODEC_CAP_DR1,

  1351.     NULL

  1352. };

  1353. 

  1354. AVCodec thp_decoder = {

  1355.     "thp",

  1356.     CODEC_TYPE_VIDEO,

  1357.     CODEC_ID_THP,

  1358.     sizeof(MJpegDecodeContext),

  1359.     ff_mjpeg_decode_init,

  1360.     NULL,

  1361.     ff_mjpeg_decode_end,

  1362.     ff_mjpeg_decode_frame,

  1363.     CODEC_CAP_DR1,

  1364.     NULL

  1365. };