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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 0x121111:

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

  303.         break;

  304.     case 0x211111:

  305.     case 0x221212:

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

  307.         break;

  308.     default:

  309.     case 0x221111:

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

  311.         break;

  312.     }

  313.     if(s->ls){

  314.         if(s->nb_components > 1)

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

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

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

  318.         else

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

  320.     }

  321. 

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

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

  324. 

  325.     s->picture.reference= 0;

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

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

  328.         return -1;

  329.     }

  330.     s->picture.pict_type= I_TYPE;

  331.     s->picture.key_frame= 1;

  332. 

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

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

  335.     }

  336. 

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

  338. 

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

  340.     {

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

  342.     }

  343. 

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

  345.     if(s->progressive){

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

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

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

  349.     }

  350.     return 0;

  351. }

  352. 

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

  354. {

  355.     int code;

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

  357.     if (code < 0)

  358.     {

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

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

  361.         return 0xffff;

  362.     }

  363. 

  364.     if(code)

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

  366.     else

  367.         return 0;

  368. }

  369. 

  370. /* decode block and dequantize */

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

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

  373. {

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

  375. 

  376.     /* DC coef */

  377.     val = mjpeg_decode_dc(s, dc_index);

  378.     if (val == 0xffff) {

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

  380.         return -1;

  381.     }

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

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

  384.     block[0] = val;

  385.     /* AC coefs */

  386.     i = 0;

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

  388.     for(;;) {

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

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

  391. 

  392.         /* EOB */

  393.         if (code == 0x10)

  394.             break;

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

  396.         if(code != 0x100){

  397.             code &= 0xf;

  398.             if(code > MIN_CACHE_BITS - 16){

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

  400.             }

  401.             {

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

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

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

  405.             }

  406. 

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

  408. 

  409.             if (i >= 63) {

  410.                 if(i == 63){

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

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

  413.                     break;

  414.                 }

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

  416.                 return -1;

  417.             }

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

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

  420.         }

  421.     }

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

  423. 

  424.     return 0;

  425. }

  426. 

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

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

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

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

  431. {

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

  433. 

  434.     /* DC coef */

  435.     if(!ss){

  436.         val = mjpeg_decode_dc(s, dc_index);

  437.         if (val == 0xffff) {

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

  439.             return -1;

  440.         }

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

  442.     }else

  443.         val = 0;

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

  445.     block[0] = val;

  446.     if(!se) return 0;

  447.     /* AC coefs */

  448.     if(*EOBRUN){

  449.         (*EOBRUN)--;

  450.         return 0;

  451.     }

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

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

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

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

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

  457.         code -= 16;

  458.         if(code & 0xF) {

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

  460.             code &= 0xf;

  461.             if(code > MIN_CACHE_BITS - 16){

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

  463.             }

  464.             {

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

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

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

  468.             }

  469. 

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

  471. 

  472.             if (i >= se) {

  473.                 if(i == se){

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

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

  476.                     break;

  477.                 }

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

  479.                 return -1;

  480.             }

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

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

  483.         }else{

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

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

  486.                 i += 15;

  487.             }else{

  488.                 val = run;

  489.                 run = (1 << run);

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

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

  492.                 if(val)

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

  494.                 *EOBRUN = run - 1;

  495.                 break;

  496.             }

  497.         }

  498.     }

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

  500. 

  501.     return 0;

  502. }

  503. 

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

  505.     int i, mb_x, mb_y;

  506.     uint16_t buffer[32768][4];

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

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

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

  510. 

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

  512.         return -1;

  513. 

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

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

  516.     }

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

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

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

  520. 

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

  522.             ptr += linesize >> 1;

  523. 

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

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

  526.         }

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

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

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

  530. 

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

  532.                 int pred;

  533. 

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

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

  536. 

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

  538. 

  539.                 left[i]=

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

  541.             }

  542. 

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

  544.                 align_get_bits(&s->gb);

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

  546.             }

  547.         }

  548. 

  549.         if(s->rct){

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

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

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

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

  554.             }

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

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

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

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

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

  560.             }

  561.         }else{

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

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

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

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

  566.             }

  567.         }

  568.     }

  569.     return 0;

  570. }

  571. 

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

  573.     int i, mb_x, mb_y;

  574.     const int nb_components=3;

  575. 

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

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

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

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

  580. 

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

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

  583.                     uint8_t *ptr;

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

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

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

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

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

  589.                     x = 0;

  590.                     y = 0;

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

  592. 

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

  594.                         int pred;

  595. 

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

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

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

  599.                                 pred= 128 << point_transform;

  600.                             }else{

  601.                                 pred= ptr[-1];

  602.                             }

  603.                         }else{

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

  605.                                 pred= ptr[-linesize];

  606.                             }else{

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

  608.                             }

  609.                         }

  610. 

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

  612.                             ptr += linesize >> 1;

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

  614. 

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

  616.                             x = 0;

  617.                             y++;

  618.                         }

  619.                     }

  620.                 }

  621.             }else{

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

  623.                     uint8_t *ptr;

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

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

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

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

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

  629.                     x = 0;

  630.                     y = 0;

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

  632. 

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

  634.                         int pred;

  635. 

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

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

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

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

  640.                             x = 0;

  641.                             y++;

  642.                         }

  643.                     }

  644.                 }

  645.             }

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

  647.                 align_get_bits(&s->gb);

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

  649.             }

  650.         }

  651.     }

  652.     return 0;

  653. }

  654. 

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

  656.     int i, mb_x, mb_y;

  657.     int EOBRUN = 0;

  658. 

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

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

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

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

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

  664. 

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

  666.                 uint8_t *ptr;

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

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

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

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

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

  672.                 x = 0;

  673.                 y = 0;

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

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

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

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

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

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

  680.                         return -1;

  681.                     }

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

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

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

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

  686.                         return -1;

  687.                     }

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

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

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

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

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

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

  694. //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);

  695.                     if(!s->progressive)

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

  697.                     else

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

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

  700.                         x = 0;

  701.                         y++;

  702.                     }

  703.                 }

  704.             }

  705.             /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

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

  707.                 !--s->restart_count) {

  708.                 align_get_bits(&s->gb);

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

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

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

  712.             }

  713.         }

  714.     }

  715.     return 0;

  716. }

  717. 

  718. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  719. {

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

  721.     int vmax, hmax, index, id;

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

  723.     int ilv, prev_shift;

  724. 

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

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

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

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

  729.     {

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

  731.         return -1;

  732.     }

  733.     vmax = 0;

  734.     hmax = 0;

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

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

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

  738.         /* find component index */

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

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

  741.                 break;

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

  743.         {

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

  745.             return -1;

  746.         }

  747. 

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

  749. 

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

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

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

  753. 

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

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

  756. 

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

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

  759.             goto out_of_range;

  760. #if 0 //buggy

  761.         switch(s->start_code)

  762.         {

  763.             case SOF0:

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

  765.                     goto out_of_range;

  766.                 break;

  767.             case SOF1:

  768.             case SOF2:

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

  770.                     goto out_of_range;

  771.                 break;

  772.             case SOF3:

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

  774.                     goto out_of_range;

  775.                 break;

  776.         }

  777. #endif

  778.     }

  779. 

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

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

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

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

  784. 

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

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

  787. 

  788.     if (nb_components > 1) {

  789.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  800.     }

  801. 

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

  803.         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" : "",

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

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

  806. 

  807. 

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

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

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

  811. 

  812.     if(s->lossless){

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

  814. //            for(){

  815. //            reset_ls_coding_parameters(s, 0);

  816. 

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

  818.         }else{

  819.             if(s->rgb){

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

  821.                     return -1;

  822.             }else{

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

  824.                     return -1;

  825.             }

  826.         }

  827.     }else{

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

  829.             return -1;

  830.     }

  831.     emms_c();

  832.     return 0;

  833.  out_of_range:

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

  835.     return -1;

  836. }

  837. 

  838. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  839. {

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

  841.         return -1;

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

  843.     s->restart_count = 0;

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

  845. 

  846.     return 0;

  847. }

  848. 

  849. static int mjpeg_decode_app(MJpegDecodeContext *s)

  850. {

  851.     int len, id, i;

  852. 

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

  854.     if (len < 5)

  855.         return -1;

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

  857.         return -1;

  858. 

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

  860.     id = be2me_32(id);

  861.     len -= 6;

  862. 

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

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

  865.     }

  866. 

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

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

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

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

  871.     {

  872.         /* structure:

  873.             4bytes      AVI1

  874.             1bytes      polarity

  875.             1bytes      always zero

  876.             4bytes      field_size

  877.             4bytes      field_size_less_padding

  878.         */

  879.             s->buggy_avid = 1;

  880. //        if (s->first_picture)

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

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

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

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

  885. #if 0

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

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

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

  889.         len -= 10;

  890. #endif

  891. //        if (s->interlace_polarity)

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

  893.         goto out;

  894.     }

  895. 

  896. //    len -= 2;

  897. 

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

  899.     {

  900.         int t_w, t_h, v1, v2;

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

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

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

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

  905. 

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

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

  908. 

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

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

  911.                 v1, v2,

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

  913.                 s->avctx->sample_aspect_ratio.den

  914.             );

  915. 

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

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

  918.         if (t_w && t_h)

  919.         {

  920.             /* skip thumbnail */

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

  922.                 len -= t_w*t_h*3;

  923.         }

  924.         len -= 10;

  925.         goto out;

  926.     }

  927. 

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

  929.     {

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

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

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

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

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

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

  936.         len -= 7;

  937.         goto out;

  938.     }

  939. 

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

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

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

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

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

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

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

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

  948.         case 1:

  949.             s->rgb= 1;

  950.             s->pegasus_rct=0;

  951.             break;

  952.         case 2:

  953.             s->rgb= 1;

  954.             s->pegasus_rct=1;

  955.             break;

  956.         default:

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

  958.         }

  959.         len -= 9;

  960.         goto out;

  961.     }

  962. 

  963.     /* Apple MJPEG-A */

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

  965.     {

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

  967.         id = be2me_32(id);

  968.         len -= 4;

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

  970.         {

  971. #if 0

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

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

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

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

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

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

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

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

  980. #endif

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

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

  983.         }

  984.     }

  985. 

  986. out:

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

  988.     if (len < 0)

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

  990.     while(--len > 0)

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

  992. 

  993.     return 0;

  994. }

  995. 

  996. static int mjpeg_decode_com(MJpegDecodeContext *s)

  997. {

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

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

  1000.         char *cbuf = av_malloc(len - 1);

  1001.         if (cbuf) {

  1002.             int i;

  1003.             for (i = 0; i < len - 2; i++)

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

  1005.             if (i > 0 && cbuf[i-1] == '\n')

  1006.                 cbuf[i-1] = 0;

  1007.             else

  1008.                 cbuf[i] = 0;

  1009. 

  1010.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1011.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1012. 

  1013.             /* buggy avid, it puts EOI only at every 10th frame */

  1014.             if (!strcmp(cbuf, "AVID"))

  1015.             {

  1016.                 s->buggy_avid = 1;

  1017.                 //        if (s->first_picture)

  1018.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1019.             }

  1020.             else if(!strcmp(cbuf, "CS=ITU601")){

  1021.                 s->cs_itu601= 1;

  1022.             }

  1023. 

  1024.             av_free(cbuf);

  1025.         }

  1026.     }

  1027. 

  1028.     return 0;

  1029. }

  1030. 

  1031. #if 0

  1032. static int valid_marker_list[] =

  1033. {

  1034.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1035. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1036. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1037. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1038. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1039. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1040. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1041. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1042. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1043. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1044. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1045. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1046. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1047. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1048. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1049. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1050. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1051. }

  1052. #endif

  1053. 

  1054. /* return the 8 bit start code value and update the search

  1055.    state. Return -1 if no start code found */

  1056. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1057. {

  1058.     uint8_t *buf_ptr;

  1059.     unsigned int v, v2;

  1060.     int val;

  1061. #ifdef DEBUG

  1062.     int skipped=0;

  1063. #endif

  1064. 

  1065.     buf_ptr = *pbuf_ptr;

  1066.     while (buf_ptr < buf_end) {

  1067.         v = *buf_ptr++;

  1068.         v2 = *buf_ptr;

  1069.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1070.             val = *buf_ptr++;

  1071.             goto found;

  1072.         }

  1073. #ifdef DEBUG

  1074.         skipped++;

  1075. #endif

  1076.     }

  1077.     val = -1;

  1078. found:

  1079. #ifdef DEBUG

  1080.     av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);

  1081. #endif

  1082.     *pbuf_ptr = buf_ptr;

  1083.     return val;

  1084. }

  1085. 

  1086. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1087.                               void *data, int *data_size,

  1088.                               uint8_t *buf, int buf_size)

  1089. {

  1090.     MJpegDecodeContext *s = avctx->priv_data;

  1091.     uint8_t *buf_end, *buf_ptr;

  1092.     int start_code;

  1093.     AVFrame *picture = data;

  1094. 

  1095.     buf_ptr = buf;

  1096.     buf_end = buf + buf_size;

  1097.     while (buf_ptr < buf_end) {

  1098.         /* find start next marker */

  1099.         start_code = find_marker(&buf_ptr, buf_end);

  1100.         {

  1101.             /* EOF */

  1102.             if (start_code < 0) {

  1103.                 goto the_end;

  1104.             } else {

  1105.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1106. 

  1107.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1108.                 {

  1109.                     av_free(s->buffer);

  1110.                     s->buffer_size = buf_end-buf_ptr;

  1111.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1112.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1113.                         s->buffer_size);

  1114.                 }

  1115. 

  1116.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1117.                 if (start_code == SOS && !s->ls)

  1118.                 {

  1119.                     uint8_t *src = buf_ptr;

  1120.                     uint8_t *dst = s->buffer;

  1121. 

  1122.                     while (src<buf_end)

  1123.                     {

  1124.                         uint8_t x = *(src++);

  1125. 

  1126.                         *(dst++) = x;

  1127.                         if (avctx->codec_id != CODEC_ID_THP)

  1128.                         {

  1129.                             if (x == 0xff) {

  1130.                                 while (src < buf_end && x == 0xff)

  1131.                                     x = *(src++);

  1132. 

  1133.                                 if (x >= 0xd0 && x <= 0xd7)

  1134.                                     *(dst++) = x;

  1135.                                 else if (x)

  1136.                                     break;

  1137.                             }

  1138.                         }

  1139.                     }

  1140.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1141. 

  1142.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1143.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1144.                 }

  1145.                 else if(start_code == SOS && s->ls){

  1146.                     uint8_t *src = buf_ptr;

  1147.                     uint8_t *dst = s->buffer;

  1148.                     int bit_count = 0;

  1149.                     int t = 0, b = 0;

  1150.                     PutBitContext pb;

  1151. 

  1152.                     s->cur_scan++;

  1153. 

  1154.                     /* find marker */

  1155.                     while (src + t < buf_end){

  1156.                         uint8_t x = src[t++];

  1157.                         if (x == 0xff){

  1158.                             while((src + t < buf_end) && x == 0xff)

  1159.                                 x = src[t++];

  1160.                             if (x & 0x80) {

  1161.                                 t -= 2;

  1162.                                 break;

  1163.                             }

  1164.                         }

  1165.                     }

  1166.                     bit_count = t * 8;

  1167. 

  1168.                     init_put_bits(&pb, dst, t);

  1169. 

  1170.                     /* unescape bitstream */

  1171.                     while(b < t){

  1172.                         uint8_t x = src[b++];

  1173.                         put_bits(&pb, 8, x);

  1174.                         if(x == 0xFF){

  1175.                             x = src[b++];

  1176.                             put_bits(&pb, 7, x);

  1177.                             bit_count--;

  1178.                         }

  1179.                     }

  1180.                     flush_put_bits(&pb);

  1181. 

  1182.                     init_get_bits(&s->gb, dst, bit_count);

  1183.                 }

  1184.                 else

  1185.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1186. 

  1187.                 s->start_code = start_code;

  1188.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1189.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1190.                 }

  1191. 

  1192.                 /* process markers */

  1193.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1194.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1195.                     /* APP fields */

  1196.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1197.                     mjpeg_decode_app(s);

  1198.                     /* Comment */

  1199.                 } else if (start_code == COM){

  1200.                     mjpeg_decode_com(s);

  1201.                 }

  1202. 

  1203.                 switch(start_code) {

  1204.                 case SOI:

  1205.                     s->restart_interval = 0;

  1206. 

  1207.                     s->restart_count = 0;

  1208.                     /* nothing to do on SOI */

  1209.                     break;

  1210.                 case DQT:

  1211.                     ff_mjpeg_decode_dqt(s);

  1212.                     break;

  1213.                 case DHT:

  1214.                     if(ff_mjpeg_decode_dht(s) < 0){

  1215.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1216.                         return -1;

  1217.                     }

  1218.                     break;

  1219.                 case SOF0:

  1220.                     s->lossless=0;

  1221.                     s->ls=0;

  1222.                     s->progressive=0;

  1223.                     if (ff_mjpeg_decode_sof(s) < 0)

  1224.                         return -1;

  1225.                     break;

  1226.                 case SOF2:

  1227.                     s->lossless=0;

  1228.                     s->ls=0;

  1229.                     s->progressive=1;

  1230.                     if (ff_mjpeg_decode_sof(s) < 0)

  1231.                         return -1;

  1232.                     break;

  1233.                 case SOF3:

  1234.                     s->lossless=1;

  1235.                     s->ls=0;

  1236.                     s->progressive=0;

  1237.                     if (ff_mjpeg_decode_sof(s) < 0)

  1238.                         return -1;

  1239.                     break;

  1240.                 case SOF48:

  1241.                     s->lossless=1;

  1242.                     s->ls=1;

  1243.                     s->progressive=0;

  1244.                     if (ff_mjpeg_decode_sof(s) < 0)

  1245.                         return -1;

  1246.                     break;

  1247.                 case LSE:

  1248.                     if (!ENABLE_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1249.                         return -1;

  1250.                     break;

  1251.                 case EOI:

  1252.                     s->cur_scan = 0;

  1253.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1254.                         break;

  1255. eoi_parser:

  1256.                     {

  1257.                         if (s->interlaced) {

  1258.                             s->bottom_field ^= 1;

  1259.                             /* if not bottom field, do not output image yet */

  1260.                             if (s->bottom_field == !s->interlace_polarity)

  1261.                                 goto not_the_end;

  1262.                         }

  1263.                         *picture = s->picture;

  1264.                         *data_size = sizeof(AVFrame);

  1265. 

  1266.                         if(!s->lossless){

  1267.                             picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);

  1268.                             picture->qstride= 0;

  1269.                             picture->qscale_table= s->qscale_table;

  1270.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1271.                             if(avctx->debug & FF_DEBUG_QP)

  1272.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1273.                             picture->quality*= FF_QP2LAMBDA;

  1274.                         }

  1275. 

  1276.                         goto the_end;

  1277.                     }

  1278.                     break;

  1279.                 case SOS:

  1280.                     ff_mjpeg_decode_sos(s);

  1281.                     /* buggy avid puts EOI every 10-20th frame */

  1282.                     /* if restart period is over process EOI */

  1283.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1284.                         goto eoi_parser;

  1285.                     break;

  1286.                 case DRI:

  1287.                     mjpeg_decode_dri(s);

  1288.                     break;

  1289.                 case SOF1:

  1290.                 case SOF5:

  1291.                 case SOF6:

  1292.                 case SOF7:

  1293.                 case SOF9:

  1294.                 case SOF10:

  1295.                 case SOF11:

  1296.                 case SOF13:

  1297.                 case SOF14:

  1298.                 case SOF15:

  1299.                 case JPG:

  1300.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1301.                     break;

  1302. //                default:

  1303. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1304. //                    break;

  1305.                 }

  1306. 

  1307. not_the_end:

  1308.                 /* eof process start code */

  1309.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1310.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1311.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1312.             }

  1313.         }

  1314.     }

  1315. the_end:

  1316.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1317. //    return buf_end - buf_ptr;

  1318.     return buf_ptr - buf;

  1319. }

  1320. 

  1321. int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1322. {

  1323.     MJpegDecodeContext *s = avctx->priv_data;

  1324.     int i, j;

  1325. 

  1326.     av_free(s->buffer);

  1327.     av_free(s->qscale_table);

  1328. 

  1329.     for(i=0;i<2;i++) {

  1330.         for(j=0;j<4;j++)

  1331.             free_vlc(&s->vlcs[i][j]);

  1332.     }

  1333.     return 0;

  1334. }

  1335. 

  1336. AVCodec mjpeg_decoder = {

  1337.     "mjpeg",

  1338.     CODEC_TYPE_VIDEO,

  1339.     CODEC_ID_MJPEG,

  1340.     sizeof(MJpegDecodeContext),

  1341.     ff_mjpeg_decode_init,

  1342.     NULL,

  1343.     ff_mjpeg_decode_end,

  1344.     ff_mjpeg_decode_frame,

  1345.     CODEC_CAP_DR1,

  1346.     NULL

  1347. };

  1348. 

  1349. AVCodec thp_decoder = {

  1350.     "thp",

  1351.     CODEC_TYPE_VIDEO,

  1352.     CODEC_ID_THP,

  1353.     sizeof(MJpegDecodeContext),

  1354.     ff_mjpeg_decode_init,

  1355.     NULL,

  1356.     ff_mjpeg_decode_end,

  1357.     ff_mjpeg_decode_frame,

  1358.     CODEC_CAP_DR1,

  1359.     NULL

  1360. };