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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, 12, 0, 0);

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

  69.               ff_mjpeg_val_dc, 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. av_cold 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] << 28) | (s->v_count[0] << 24) |

  288.                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |

  289.                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |

  290.                  (s->h_count[3] <<  4) |  s->v_count[3];

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

  292.     if(!(pix_fmt_id & 0x10101010))

  293.         pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;

  294.     if(!(pix_fmt_id & 0x01010101))

  295.         pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;

  296. 

  297.     switch(pix_fmt_id){

  298.     case 0x11111100:

  299.         if(s->rgb){

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

  301.         }else

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

  303.         assert(s->nb_components==3);

  304.         break;

  305.     case 0x11000000:

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

  307.         break;

  308.     case 0x12111100:

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

  310.         break;

  311.     case 0x21111100:

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

  313.         break;

  314.     case 0x22111100:

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

  316.         break;

  317.     default:

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

  319.         return -1;

  320.     }

  321.     if(s->ls){

  322.         if(s->nb_components > 1)

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

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

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

  326.         else

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

  328.     }

  329. 

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

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

  332. 

  333.     s->picture.reference= 0;

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

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

  336.         return -1;

  337.     }

  338.     s->picture.pict_type= FF_I_TYPE;

  339.     s->picture.key_frame= 1;

  340. 

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

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

  343.     }

  344. 

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

  346. 

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

  348.     {

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

  350.     }

  351. 

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

  353.     if(s->progressive){

  354.         int bw = (width  + s->h_max*8-1) / (s->h_max*8);

  355.         int bh = (height + s->v_max*8-1) / (s->v_max*8);

  356.         for(i=0; i<s->nb_components; i++) {

  357.             int size = bw * bh * s->h_count[i] * s->v_count[i];

  358.             av_freep(&s->blocks[i]);

  359.             av_freep(&s->last_nnz[i]);

  360.             s->blocks[i] = av_malloc(size * sizeof(**s->blocks));

  361.             s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));

  362.             s->block_stride[i] = bw * s->h_count[i];

  363.         }

  364.         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));

  365.     }

  366.     return 0;

  367. }

  368. 

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

  370. {

  371.     int code;

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

  373.     if (code < 0)

  374.     {

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

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

  377.         return 0xffff;

  378.     }

  379. 

  380.     if(code)

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

  382.     else

  383.         return 0;

  384. }

  385. 

  386. /* decode block and dequantize */

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

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

  389. {

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

  391. 

  392.     /* DC coef */

  393.     val = mjpeg_decode_dc(s, dc_index);

  394.     if (val == 0xffff) {

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

  396.         return -1;

  397.     }

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

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

  400.     block[0] = val;

  401.     /* AC coefs */

  402.     i = 0;

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

  404.     for(;;) {

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

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

  407. 

  408.         /* EOB */

  409.         if (code == 0x10)

  410.             break;

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

  412.         if(code != 0x100){

  413.             code &= 0xf;

  414.             if(code > MIN_CACHE_BITS - 16){

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

  416.             }

  417.             {

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

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

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

  421.             }

  422. 

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

  424. 

  425.             if (i >= 63) {

  426.                 if(i == 63){

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

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

  429.                     break;

  430.                 }

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

  432.                 return -1;

  433.             }

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

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

  436.         }

  437.     }

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

  439. 

  440.     return 0;

  441. }

  442. 

  443. static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,

  444.                                  int dc_index, int16_t *quant_matrix, int Al)

  445. {

  446.     int val;

  447.     s->dsp.clear_block(block);

  448.     val = mjpeg_decode_dc(s, dc_index);

  449.     if (val == 0xffff) {

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

  451.         return -1;

  452.     }

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

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

  455.     block[0] = val;

  456.     return 0;

  457. }

  458. 

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

  460. static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,

  461.                                     int ac_index, int16_t *quant_matrix,

  462.                                     int ss, int se, int Al, int *EOBRUN)

  463. {

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

  465. 

  466.     if(*EOBRUN){

  467.         (*EOBRUN)--;

  468.         return 0;

  469.     }

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

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

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

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

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

  475.         code -= 16;

  476.         if(code & 0xF) {

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

  478.             code &= 0xf;

  479.             if(code > MIN_CACHE_BITS - 16){

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

  481.             }

  482.             {

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

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

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

  486.             }

  487. 

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

  489. 

  490.             if (i >= se) {

  491.                 if(i == se){

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

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

  494.                     break;

  495.                 }

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

  497.                 return -1;

  498.             }

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

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

  501.         }else{

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

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

  504.                 i += 15;

  505.             }else{

  506.                 val = run;

  507.                 run = (1 << run);

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

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

  510.                 if(val)

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

  512.                 *EOBRUN = run - 1;

  513.                 break;

  514.             }

  515.         }

  516.     }

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

  518.     if(i > *last_nnz)

  519.         *last_nnz = i;

  520.     return 0;

  521. }

  522. 

  523. #define REFINE_BIT(j) {\

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

  525.     sign = block[j]>>15;\

  526.     block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\

  527.     LAST_SKIP_BITS(re, &s->gb, 1);\

  528. }

  529. 

  530. #define ZERO_RUN \

  531. for(;;i++) {\

  532.     if(i > last) {\

  533.         i += run;\

  534.         if(i > se) {\

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

  536.             return -1;\

  537.         }\

  538.         break;\

  539.     }\

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

  541.     if(block[j])\

  542.         REFINE_BIT(j)\

  543.     else if(run-- == 0)\

  544.         break;\

  545. }

  546. 

  547. /* decode block and dequantize - progressive JPEG refinement pass */

  548. static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,

  549.                         int ac_index, int16_t *quant_matrix,

  550.                         int ss, int se, int Al, int *EOBRUN)

  551. {

  552.     int code, i=ss, j, sign, val, run;

  553.     int last = FFMIN(se, *last_nnz);

  554. 

  555.     OPEN_READER(re, &s->gb);

  556.     if(*EOBRUN)

  557.         (*EOBRUN)--;

  558.     else {

  559.         for(;;i++) {

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

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

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

  563.             code -= 16;

  564.             if(code & 0xF) {

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

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

  567.                 val = SHOW_UBITS(re, &s->gb, 1);

  568.                 LAST_SKIP_BITS(re, &s->gb, 1);

  569.                 ZERO_RUN;

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

  571.                 val--;

  572.                 block[j] = ((quant_matrix[j]^val)-val) << Al;

  573.                 if(i == se) {

  574.                     if(i > *last_nnz)

  575.                         *last_nnz = i;

  576.                     CLOSE_READER(re, &s->gb)

  577.                     return 0;

  578.                 }

  579.             }else{

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

  581.                 if(run == 0xF){

  582.                     ZERO_RUN;

  583.                 }else{

  584.                     val = run;

  585.                     run = (1 << run);

  586.                     if(val) {

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

  588.                         run += SHOW_UBITS(re, &s->gb, val);

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

  590.                     }

  591.                     *EOBRUN = run - 1;

  592.                     break;

  593.                 }

  594.             }

  595.         }

  596. 

  597.         if(i > *last_nnz)

  598.             *last_nnz = i;

  599.     }

  600. 

  601.     for(;i<=last;i++) {

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

  603.         if(block[j])

  604.             REFINE_BIT(j)

  605.     }

  606.     CLOSE_READER(re, &s->gb);

  607. 

  608.     return 0;

  609. }

  610. #undef REFINE_BIT

  611. #undef ZERO_RUN

  612. 

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

  614.     int i, mb_x, mb_y;

  615.     uint16_t buffer[32768][4];

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

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

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

  619. 

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

  621.         return -1;

  622. 

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

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

  625.     }

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

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

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

  629. 

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

  631.             ptr += linesize >> 1;

  632. 

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

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

  635.         }

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

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

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

  639. 

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

  641.                 int pred;

  642. 

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

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

  645. 

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

  647. 

  648.                 left[i]=

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

  650.             }

  651. 

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

  653.                 align_get_bits(&s->gb);

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

  655.             }

  656.         }

  657. 

  658.         if(s->rct){

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

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

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

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

  663.             }

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

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

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

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

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

  669.             }

  670.         }else{

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

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

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

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

  675.             }

  676.         }

  677.     }

  678.     return 0;

  679. }

  680. 

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

  682.     int i, mb_x, mb_y;

  683.     const int nb_components=3;

  684. 

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

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

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

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

  689. 

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

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

  692.                     uint8_t *ptr;

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

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

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

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

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

  698.                     x = 0;

  699.                     y = 0;

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

  701. 

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

  703.                         int pred;

  704. 

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

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

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

  708.                                 pred= 128 << point_transform;

  709.                             }else{

  710.                                 pred= ptr[-1];

  711.                             }

  712.                         }else{

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

  714.                                 pred= ptr[-linesize];

  715.                             }else{

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

  717.                             }

  718.                         }

  719. 

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

  721.                             ptr += linesize >> 1;

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

  723. 

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

  725.                             x = 0;

  726.                             y++;

  727.                         }

  728.                     }

  729.                 }

  730.             }else{

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

  732.                     uint8_t *ptr;

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

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

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

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

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

  738.                     x = 0;

  739.                     y = 0;

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

  741. 

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

  743.                         int pred;

  744. 

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

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

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

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

  749.                             x = 0;

  750.                             y++;

  751.                         }

  752.                     }

  753.                 }

  754.             }

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

  756.                 align_get_bits(&s->gb);

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

  758.             }

  759.         }

  760.     }

  761.     return 0;

  762. }

  763. 

  764. static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al){

  765.     int i, mb_x, mb_y;

  766.     uint8_t* data[MAX_COMPONENTS];

  767.     int linesize[MAX_COMPONENTS];

  768. 

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

  770.         int c = s->comp_index[i];

  771.         data[c] = s->picture.data[c];

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

  773.         s->coefs_finished[c] |= 1;

  774.         if(s->avctx->codec->id==CODEC_ID_AMV) {

  775.             //picture should be flipped upside-down for this codec

  776.             assert(!(s->avctx->flags & CODEC_FLAG_EMU_EDGE));

  777.             data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));

  778.             linesize[c] *= -1;

  779.         }

  780.     }

  781. 

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

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

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

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

  786. 

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

  788.                 uint8_t *ptr;

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

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

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

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

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

  794.                 x = 0;

  795.                 y = 0;

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

  797.                     ptr = data[c] +

  798.                         (((linesize[c] * (v * mb_y + y) * 8) +

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

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

  801.                         ptr += linesize[c] >> 1;

  802.                     if(!s->progressive) {

  803.                         s->dsp.clear_block(s->block);

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

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

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

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

  808.                             return -1;

  809.                         }

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

  811.                     } else {

  812.                         int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);

  813.                         DCTELEM *block = s->blocks[c][block_idx];

  814.                         if(Ah)

  815.                             block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;

  816.                         else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {

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

  818.                             return -1;

  819.                         }

  820.                     }

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

  822. //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);

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

  824.                         x = 0;

  825.                         y++;

  826.                     }

  827.                 }

  828.             }

  829.             /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

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

  831.                 !--s->restart_count) {

  832.                 align_get_bits(&s->gb);

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

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

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

  836.             }

  837.         }

  838.     }

  839.     return 0;

  840. }

  841. 

  842. static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){

  843.     int mb_x, mb_y;

  844.     int EOBRUN = 0;

  845.     int c = s->comp_index[0];

  846.     uint8_t* data = s->picture.data[c];

  847.     int linesize = s->linesize[c];

  848.     int last_scan = 0;

  849.     int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];

  850. 

  851.     if(!Al) {

  852.         s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);

  853.         last_scan = !~s->coefs_finished[c];

  854.     }

  855. 

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

  857.         data += linesize >> 1;

  858. 

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

  860.         uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);

  861.         int block_idx = mb_y * s->block_stride[c];

  862.         DCTELEM (*block)[64] = &s->blocks[c][block_idx];

  863.         uint8_t *last_nnz = &s->last_nnz[c][block_idx];

  864.         for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {

  865.             int ret;

  866.             if(Ah)

  867.                 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],

  868.                                               quant_matrix, ss, se, Al, &EOBRUN);

  869.             else

  870.                 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],

  871.                                                quant_matrix, ss, se, Al, &EOBRUN);

  872.             if(ret < 0) {

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

  874.                 return -1;

  875.             }

  876.             if(last_scan) {

  877.                 s->dsp.idct_put(ptr, linesize, *block);

  878.                 ptr += 8 >> s->avctx->lowres;

  879.             }

  880.         }

  881.     }

  882.     return 0;

  883. }

  884. 

  885. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  886. {

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

  888.     int vmax, hmax, index, id;

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

  890.     int ilv, prev_shift;

  891. 

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

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

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

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

  896.     {

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

  898.         return -1;

  899.     }

  900.     vmax = 0;

  901.     hmax = 0;

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

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

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

  905.         /* find component index */

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

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

  908.                 break;

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

  910.         {

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

  912.             return -1;

  913.         }

  914. 

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

  916. 

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

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

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

  920. 

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

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

  923. 

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

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

  926.             goto out_of_range;

  927. #if 0 //buggy

  928.         switch(s->start_code)

  929.         {

  930.             case SOF0:

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

  932.                     goto out_of_range;

  933.                 break;

  934.             case SOF1:

  935.             case SOF2:

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

  937.                     goto out_of_range;

  938.                 break;

  939.             case SOF3:

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

  941.                     goto out_of_range;

  942.                 break;

  943.         }

  944. #endif

  945.     }

  946. 

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

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

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

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

  951. 

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

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

  954. 

  955.     if (nb_components > 1) {

  956.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  967.     }

  968. 

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

  970.         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" : "",

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

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

  973. 

  974. 

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

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

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

  978. 

  979.     if(s->lossless){

  980.         if(CONFIG_JPEGLS_DECODER && s->ls){

  981. //            for(){

  982. //            reset_ls_coding_parameters(s, 0);

  983. 

  984.             if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)

  985.                 return -1;

  986.         }else{

  987.             if(s->rgb){

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

  989.                     return -1;

  990.             }else{

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

  992.                     return -1;

  993.             }

  994.         }

  995.     }else{

  996.         if(s->progressive && predictor) {

  997.             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)

  998.                 return -1;

  999.         } else {

  1000.             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform) < 0)

  1001.                 return -1;

  1002.         }

  1003.     }

  1004.     emms_c();

  1005.     return 0;

  1006.  out_of_range:

  1007.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1008.     return -1;

  1009. }

  1010. 

  1011. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1012. {

  1013.     if (get_bits(&s->gb, 16) != 4)

  1014.         return -1;

  1015.     s->restart_interval = get_bits(&s->gb, 16);

  1016.     s->restart_count = 0;

  1017.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1018. 

  1019.     return 0;

  1020. }

  1021. 

  1022. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1023. {

  1024.     int len, id, i;

  1025. 

  1026.     len = get_bits(&s->gb, 16);

  1027.     if (len < 5)

  1028.         return -1;

  1029.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1030.         return -1;

  1031. 

  1032.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1033.     id = be2me_32(id);

  1034.     len -= 6;

  1035. 

  1036.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1037.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1038.     }

  1039. 

  1040.     /* buggy AVID, it puts EOI only at every 10th frame */

  1041.     /* also this fourcc is used by non-avid files too, it holds some

  1042.        informations, but it's always present in AVID creates files */

  1043.     if (id == AV_RL32("AVI1"))

  1044.     {

  1045.         /* structure:

  1046.             4bytes      AVI1

  1047.             1bytes      polarity

  1048.             1bytes      always zero

  1049.             4bytes      field_size

  1050.             4bytes      field_size_less_padding

  1051.         */

  1052.             s->buggy_avid = 1;

  1053. //        if (s->first_picture)

  1054. //            printf("mjpeg: workarounding buggy AVID\n");

  1055.         i = get_bits(&s->gb, 8);

  1056.         if     (i==2) s->bottom_field= 1;

  1057.         else if(i==1) s->bottom_field= 0;

  1058. #if 0

  1059.         skip_bits(&s->gb, 8);

  1060.         skip_bits(&s->gb, 32);

  1061.         skip_bits(&s->gb, 32);

  1062.         len -= 10;

  1063. #endif

  1064. //        if (s->interlace_polarity)

  1065. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1066.         goto out;

  1067.     }

  1068. 

  1069. //    len -= 2;

  1070. 

  1071.     if (id == AV_RL32("JFIF"))

  1072.     {

  1073.         int t_w, t_h, v1, v2;

  1074.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1075.         v1= get_bits(&s->gb, 8);

  1076.         v2= get_bits(&s->gb, 8);

  1077.         skip_bits(&s->gb, 8);

  1078. 

  1079.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1080.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1081. 

  1082.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1083.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1084.                 v1, v2,

  1085.                 s->avctx->sample_aspect_ratio.num,

  1086.                 s->avctx->sample_aspect_ratio.den

  1087.             );

  1088. 

  1089.         t_w = get_bits(&s->gb, 8);

  1090.         t_h = get_bits(&s->gb, 8);

  1091.         if (t_w && t_h)

  1092.         {

  1093.             /* skip thumbnail */

  1094.             if (len-10-(t_w*t_h*3) > 0)

  1095.                 len -= t_w*t_h*3;

  1096.         }

  1097.         len -= 10;

  1098.         goto out;

  1099.     }

  1100. 

  1101.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1102.     {

  1103.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1104.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1105.         skip_bits(&s->gb, 16); /* version */

  1106.         skip_bits(&s->gb, 16); /* flags0 */

  1107.         skip_bits(&s->gb, 16); /* flags1 */

  1108.         skip_bits(&s->gb, 8);  /* transform */

  1109.         len -= 7;

  1110.         goto out;

  1111.     }

  1112. 

  1113.     if (id == AV_RL32("LJIF")){

  1114.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1115.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

  1116.         skip_bits(&s->gb, 16); /* version ? */

  1117.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1118.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1119.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1120.         switch( get_bits(&s->gb, 8)){

  1121.         case 1:

  1122.             s->rgb= 1;

  1123.             s->pegasus_rct=0;

  1124.             break;

  1125.         case 2:

  1126.             s->rgb= 1;

  1127.             s->pegasus_rct=1;

  1128.             break;

  1129.         default:

  1130.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1131.         }

  1132.         len -= 9;

  1133.         goto out;

  1134.     }

  1135. 

  1136.     /* Apple MJPEG-A */

  1137.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1138.     {

  1139.         id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1140.         id = be2me_32(id);

  1141.         len -= 4;

  1142.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1143.         {

  1144. #if 0

  1145.             skip_bits(&s->gb, 32); /* field size */

  1146.             skip_bits(&s->gb, 32); /* pad field size */

  1147.             skip_bits(&s->gb, 32); /* next off */

  1148.             skip_bits(&s->gb, 32); /* quant off */

  1149.             skip_bits(&s->gb, 32); /* huff off */

  1150.             skip_bits(&s->gb, 32); /* image off */

  1151.             skip_bits(&s->gb, 32); /* scan off */

  1152.             skip_bits(&s->gb, 32); /* data off */

  1153. #endif

  1154.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1155.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1156.         }

  1157.     }

  1158. 

  1159. out:

  1160.     /* slow but needed for extreme adobe jpegs */

  1161.     if (len < 0)

  1162.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1163.     while(--len > 0)

  1164.         skip_bits(&s->gb, 8);

  1165. 

  1166.     return 0;

  1167. }

  1168. 

  1169. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1170. {

  1171.     int len = get_bits(&s->gb, 16);

  1172.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1173.         char *cbuf = av_malloc(len - 1);

  1174.         if (cbuf) {

  1175.             int i;

  1176.             for (i = 0; i < len - 2; i++)

  1177.                 cbuf[i] = get_bits(&s->gb, 8);

  1178.             if (i > 0 && cbuf[i-1] == '\n')

  1179.                 cbuf[i-1] = 0;

  1180.             else

  1181.                 cbuf[i] = 0;

  1182. 

  1183.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1184.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1185. 

  1186.             /* buggy avid, it puts EOI only at every 10th frame */

  1187.             if (!strcmp(cbuf, "AVID"))

  1188.             {

  1189.                 s->buggy_avid = 1;

  1190.                 //        if (s->first_picture)

  1191.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1192.             }

  1193.             else if(!strcmp(cbuf, "CS=ITU601")){

  1194.                 s->cs_itu601= 1;

  1195.             }

  1196. 

  1197.             av_free(cbuf);

  1198.         }

  1199.     }

  1200. 

  1201.     return 0;

  1202. }

  1203. 

  1204. #if 0

  1205. static int valid_marker_list[] =

  1206. {

  1207.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1208. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1209. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1210. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1211. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1212. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1213. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1214. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1215. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1216. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1217. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1218. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1219. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1220. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1221. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1222. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1223. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1224. }

  1225. #endif

  1226. 

  1227. /* return the 8 bit start code value and update the search

  1228.    state. Return -1 if no start code found */

  1229. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1230. {

  1231.     const uint8_t *buf_ptr;

  1232.     unsigned int v, v2;

  1233.     int val;

  1234. #ifdef DEBUG

  1235.     int skipped=0;

  1236. #endif

  1237. 

  1238.     buf_ptr = *pbuf_ptr;

  1239.     while (buf_ptr < buf_end) {

  1240.         v = *buf_ptr++;

  1241.         v2 = *buf_ptr;

  1242.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1243.             val = *buf_ptr++;

  1244.             goto found;

  1245.         }

  1246. #ifdef DEBUG

  1247.         skipped++;

  1248. #endif

  1249.     }

  1250.     val = -1;

  1251. found:

  1252. #ifdef DEBUG

  1253.     av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);

  1254. #endif

  1255.     *pbuf_ptr = buf_ptr;

  1256.     return val;

  1257. }

  1258. 

  1259. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1260.                               void *data, int *data_size,

  1261.                               const uint8_t *buf, int buf_size)

  1262. {

  1263.     MJpegDecodeContext *s = avctx->priv_data;

  1264.     const uint8_t *buf_end, *buf_ptr;

  1265.     int start_code;

  1266.     AVFrame *picture = data;

  1267. 

  1268.     buf_ptr = buf;

  1269.     buf_end = buf + buf_size;

  1270.     while (buf_ptr < buf_end) {

  1271.         /* find start next marker */

  1272.         start_code = find_marker(&buf_ptr, buf_end);

  1273.         {

  1274.             /* EOF */

  1275.             if (start_code < 0) {

  1276.                 goto the_end;

  1277.             } else {

  1278.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1279. 

  1280.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1281.                 {

  1282.                     av_free(s->buffer);

  1283.                     s->buffer_size = buf_end-buf_ptr;

  1284.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1285.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1286.                         s->buffer_size);

  1287.                 }

  1288. 

  1289.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1290.                 if (start_code == SOS && !s->ls)

  1291.                 {

  1292.                     const uint8_t *src = buf_ptr;

  1293.                     uint8_t *dst = s->buffer;

  1294. 

  1295.                     while (src<buf_end)

  1296.                     {

  1297.                         uint8_t x = *(src++);

  1298. 

  1299.                         *(dst++) = x;

  1300.                         if (avctx->codec_id != CODEC_ID_THP)

  1301.                         {

  1302.                             if (x == 0xff) {

  1303.                                 while (src < buf_end && x == 0xff)

  1304.                                     x = *(src++);

  1305. 

  1306.                                 if (x >= 0xd0 && x <= 0xd7)

  1307.                                     *(dst++) = x;

  1308.                                 else if (x)

  1309.                                     break;

  1310.                             }

  1311.                         }

  1312.                     }

  1313.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1314. 

  1315.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1316.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1317.                 }

  1318.                 else if(start_code == SOS && s->ls){

  1319.                     const uint8_t *src = buf_ptr;

  1320.                     uint8_t *dst = s->buffer;

  1321.                     int bit_count = 0;

  1322.                     int t = 0, b = 0;

  1323.                     PutBitContext pb;

  1324. 

  1325.                     s->cur_scan++;

  1326. 

  1327.                     /* find marker */

  1328.                     while (src + t < buf_end){

  1329.                         uint8_t x = src[t++];

  1330.                         if (x == 0xff){

  1331.                             while((src + t < buf_end) && x == 0xff)

  1332.                                 x = src[t++];

  1333.                             if (x & 0x80) {

  1334.                                 t -= 2;

  1335.                                 break;

  1336.                             }

  1337.                         }

  1338.                     }

  1339.                     bit_count = t * 8;

  1340. 

  1341.                     init_put_bits(&pb, dst, t);

  1342. 

  1343.                     /* unescape bitstream */

  1344.                     while(b < t){

  1345.                         uint8_t x = src[b++];

  1346.                         put_bits(&pb, 8, x);

  1347.                         if(x == 0xFF){

  1348.                             x = src[b++];

  1349.                             put_bits(&pb, 7, x);

  1350.                             bit_count--;

  1351.                         }

  1352.                     }

  1353.                     flush_put_bits(&pb);

  1354. 

  1355.                     init_get_bits(&s->gb, dst, bit_count);

  1356.                 }

  1357.                 else

  1358.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1359. 

  1360.                 s->start_code = start_code;

  1361.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1362.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1363.                 }

  1364. 

  1365.                 /* process markers */

  1366.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1367.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1368.                     /* APP fields */

  1369.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1370.                     mjpeg_decode_app(s);

  1371.                     /* Comment */

  1372.                 } else if (start_code == COM){

  1373.                     mjpeg_decode_com(s);

  1374.                 }

  1375. 

  1376.                 switch(start_code) {

  1377.                 case SOI:

  1378.                     s->restart_interval = 0;

  1379. 

  1380.                     s->restart_count = 0;

  1381.                     /* nothing to do on SOI */

  1382.                     break;

  1383.                 case DQT:

  1384.                     ff_mjpeg_decode_dqt(s);

  1385.                     break;

  1386.                 case DHT:

  1387.                     if(ff_mjpeg_decode_dht(s) < 0){

  1388.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1389.                         return -1;

  1390.                     }

  1391.                     break;

  1392.                 case SOF0:

  1393.                     s->lossless=0;

  1394.                     s->ls=0;

  1395.                     s->progressive=0;

  1396.                     if (ff_mjpeg_decode_sof(s) < 0)

  1397.                         return -1;

  1398.                     break;

  1399.                 case SOF2:

  1400.                     s->lossless=0;

  1401.                     s->ls=0;

  1402.                     s->progressive=1;

  1403.                     if (ff_mjpeg_decode_sof(s) < 0)

  1404.                         return -1;

  1405.                     break;

  1406.                 case SOF3:

  1407.                     s->lossless=1;

  1408.                     s->ls=0;

  1409.                     s->progressive=0;

  1410.                     if (ff_mjpeg_decode_sof(s) < 0)

  1411.                         return -1;

  1412.                     break;

  1413.                 case SOF48:

  1414.                     s->lossless=1;

  1415.                     s->ls=1;

  1416.                     s->progressive=0;

  1417.                     if (ff_mjpeg_decode_sof(s) < 0)

  1418.                         return -1;

  1419.                     break;

  1420.                 case LSE:

  1421.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1422.                         return -1;

  1423.                     break;

  1424.                 case EOI:

  1425.                     s->cur_scan = 0;

  1426.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1427.                         break;

  1428. eoi_parser:

  1429.                     {

  1430.                         if (s->interlaced) {

  1431.                             s->bottom_field ^= 1;

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

  1433.                             if (s->bottom_field == !s->interlace_polarity)

  1434.                                 goto not_the_end;

  1435.                         }

  1436.                         *picture = s->picture;

  1437.                         *data_size = sizeof(AVFrame);

  1438. 

  1439.                         if(!s->lossless){

  1440.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1441.                             picture->qstride= 0;

  1442.                             picture->qscale_table= s->qscale_table;

  1443.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1444.                             if(avctx->debug & FF_DEBUG_QP)

  1445.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1446.                             picture->quality*= FF_QP2LAMBDA;

  1447.                         }

  1448. 

  1449.                         goto the_end;

  1450.                     }

  1451.                     break;

  1452.                 case SOS:

  1453.                     ff_mjpeg_decode_sos(s);

  1454.                     /* buggy avid puts EOI every 10-20th frame */

  1455.                     /* if restart period is over process EOI */

  1456.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1457.                         goto eoi_parser;

  1458.                     break;

  1459.                 case DRI:

  1460.                     mjpeg_decode_dri(s);

  1461.                     break;

  1462.                 case SOF1:

  1463.                 case SOF5:

  1464.                 case SOF6:

  1465.                 case SOF7:

  1466.                 case SOF9:

  1467.                 case SOF10:

  1468.                 case SOF11:

  1469.                 case SOF13:

  1470.                 case SOF14:

  1471.                 case SOF15:

  1472.                 case JPG:

  1473.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1474.                     break;

  1475. //                default:

  1476. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1477. //                    break;

  1478.                 }

  1479. 

  1480. not_the_end:

  1481.                 /* eof process start code */

  1482.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1483.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1484.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1485.             }

  1486.         }

  1487.     }

  1488. the_end:

  1489.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1490. //    return buf_end - buf_ptr;

  1491.     return buf_ptr - buf;

  1492. }

  1493. 

  1494. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1495. {

  1496.     MJpegDecodeContext *s = avctx->priv_data;

  1497.     int i, j;

  1498. 

  1499.     av_free(s->buffer);

  1500.     av_free(s->qscale_table);

  1501. 

  1502.     for(i=0;i<2;i++) {

  1503.         for(j=0;j<4;j++)

  1504.             free_vlc(&s->vlcs[i][j]);

  1505.     }

  1506.     for(i=0; i<MAX_COMPONENTS; i++) {

  1507.         av_freep(&s->blocks[i]);

  1508.         av_freep(&s->last_nnz[i]);

  1509.     }

  1510.     return 0;

  1511. }

  1512. 

  1513. AVCodec mjpeg_decoder = {

  1514.     "mjpeg",

  1515.     CODEC_TYPE_VIDEO,

  1516.     CODEC_ID_MJPEG,

  1517.     sizeof(MJpegDecodeContext),

  1518.     ff_mjpeg_decode_init,

  1519.     NULL,

  1520.     ff_mjpeg_decode_end,

  1521.     ff_mjpeg_decode_frame,

  1522.     CODEC_CAP_DR1,

  1523.     NULL,

  1524.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1525. };

  1526. 

  1527. AVCodec thp_decoder = {

  1528.     "thp",

  1529.     CODEC_TYPE_VIDEO,

  1530.     CODEC_ID_THP,

  1531.     sizeof(MJpegDecodeContext),

  1532.     ff_mjpeg_decode_init,

  1533.     NULL,

  1534.     ff_mjpeg_decode_end,

  1535.     ff_mjpeg_decode_frame,

  1536.     CODEC_CAP_DR1,

  1537.     NULL,

  1538.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1539. };