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

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

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

  357.     }

  358.     return 0;

  359. }

  360. 

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

  362. {

  363.     int code;

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

  365.     if (code < 0)

  366.     {

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

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

  369.         return 0xffff;

  370.     }

  371. 

  372.     if(code)

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

  374.     else

  375.         return 0;

  376. }

  377. 

  378. /* decode block and dequantize */

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

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

  381. {

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

  383. 

  384.     /* DC coef */

  385.     val = mjpeg_decode_dc(s, dc_index);

  386.     if (val == 0xffff) {

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

  388.         return -1;

  389.     }

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

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

  392.     block[0] = val;

  393.     /* AC coefs */

  394.     i = 0;

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

  396.     for(;;) {

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

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

  399. 

  400.         /* EOB */

  401.         if (code == 0x10)

  402.             break;

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

  404.         if(code != 0x100){

  405.             code &= 0xf;

  406.             if(code > MIN_CACHE_BITS - 16){

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

  408.             }

  409.             {

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

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

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

  413.             }

  414. 

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

  416. 

  417.             if (i >= 63) {

  418.                 if(i == 63){

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

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

  421.                     break;

  422.                 }

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

  424.                 return -1;

  425.             }

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

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

  428.         }

  429.     }

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

  431. 

  432.     return 0;

  433. }

  434. 

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

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

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

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

  439. {

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

  441. 

  442.     /* DC coef */

  443.     if(!ss){

  444.         val = mjpeg_decode_dc(s, dc_index);

  445.         if (val == 0xffff) {

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

  447.             return -1;

  448.         }

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

  450.     }else

  451.         val = 0;

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

  453.     block[0] = val;

  454.     if(!se) return 0;

  455.     /* AC coefs */

  456.     if(*EOBRUN){

  457.         (*EOBRUN)--;

  458.         return 0;

  459.     }

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

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

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

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

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

  465.         code -= 16;

  466.         if(code & 0xF) {

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

  468.             code &= 0xf;

  469.             if(code > MIN_CACHE_BITS - 16){

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

  471.             }

  472.             {

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

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

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

  476.             }

  477. 

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

  479. 

  480.             if (i >= se) {

  481.                 if(i == se){

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

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

  484.                     break;

  485.                 }

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

  487.                 return -1;

  488.             }

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

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

  491.         }else{

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

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

  494.                 i += 15;

  495.             }else{

  496.                 val = run;

  497.                 run = (1 << run);

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

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

  500.                 if(val)

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

  502.                 *EOBRUN = run - 1;

  503.                 break;

  504.             }

  505.         }

  506.     }

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

  508. 

  509.     return 0;

  510. }

  511. 

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

  513.     int i, mb_x, mb_y;

  514.     uint16_t buffer[32768][4];

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

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

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

  518. 

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

  520.         return -1;

  521. 

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

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

  524.     }

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

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

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

  528. 

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

  530.             ptr += linesize >> 1;

  531. 

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

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

  534.         }

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

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

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

  538. 

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

  540.                 int pred;

  541. 

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

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

  544. 

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

  546. 

  547.                 left[i]=

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

  549.             }

  550. 

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

  552.                 align_get_bits(&s->gb);

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

  554.             }

  555.         }

  556. 

  557.         if(s->rct){

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

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

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

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

  562.             }

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

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

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

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

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

  568.             }

  569.         }else{

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

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

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

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

  574.             }

  575.         }

  576.     }

  577.     return 0;

  578. }

  579. 

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

  581.     int i, mb_x, mb_y;

  582.     const int nb_components=3;

  583. 

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

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

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

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

  588. 

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

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

  591.                     uint8_t *ptr;

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

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

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

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

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

  597.                     x = 0;

  598.                     y = 0;

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

  600. 

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

  602.                         int pred;

  603. 

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

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

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

  607.                                 pred= 128 << point_transform;

  608.                             }else{

  609.                                 pred= ptr[-1];

  610.                             }

  611.                         }else{

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

  613.                                 pred= ptr[-linesize];

  614.                             }else{

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

  616.                             }

  617.                         }

  618. 

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

  620.                             ptr += linesize >> 1;

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

  622. 

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

  624.                             x = 0;

  625.                             y++;

  626.                         }

  627.                     }

  628.                 }

  629.             }else{

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

  631.                     uint8_t *ptr;

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

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

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

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

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

  637.                     x = 0;

  638.                     y = 0;

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

  640. 

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

  642.                         int pred;

  643. 

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

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

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

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

  648.                             x = 0;

  649.                             y++;

  650.                         }

  651.                     }

  652.                 }

  653.             }

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

  655.                 align_get_bits(&s->gb);

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

  657.             }

  658.         }

  659.     }

  660.     return 0;

  661. }

  662. 

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

  664.     int i, mb_x, mb_y;

  665.     int EOBRUN = 0;

  666.     uint8_t* data[MAX_COMPONENTS];

  667.     int linesize[MAX_COMPONENTS];

  668. 

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

  670. 

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

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

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

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

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

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

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

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

  679.             linesize[c] *= -1;

  680.         }

  681.     }

  682. 

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

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

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

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

  687. 

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

  689.                 uint8_t *ptr;

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

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

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

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

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

  695.                 x = 0;

  696.                 y = 0;

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

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

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

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

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

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

  703.                         return -1;

  704.                     }

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

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

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

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

  709.                         return -1;

  710.                     }

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

  712.                     ptr = data[c] +

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

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

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

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

  717. //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);

  718.                     if(!s->progressive)

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

  720.                     else

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

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

  723.                         x = 0;

  724.                         y++;

  725.                     }

  726.                 }

  727.             }

  728.             /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

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

  730.                 !--s->restart_count) {

  731.                 align_get_bits(&s->gb);

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

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

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

  735.             }

  736.         }

  737.     }

  738.     return 0;

  739. }

  740. 

  741. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  742. {

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

  744.     int vmax, hmax, index, id;

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

  746.     int ilv, prev_shift;

  747. 

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

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

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

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

  752.     {

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

  754.         return -1;

  755.     }

  756.     vmax = 0;

  757.     hmax = 0;

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

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

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

  761.         /* find component index */

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

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

  764.                 break;

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

  766.         {

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

  768.             return -1;

  769.         }

  770. 

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

  772. 

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

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

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

  776. 

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

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

  779. 

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

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

  782.             goto out_of_range;

  783. #if 0 //buggy

  784.         switch(s->start_code)

  785.         {

  786.             case SOF0:

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

  788.                     goto out_of_range;

  789.                 break;

  790.             case SOF1:

  791.             case SOF2:

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

  793.                     goto out_of_range;

  794.                 break;

  795.             case SOF3:

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

  797.                     goto out_of_range;

  798.                 break;

  799.         }

  800. #endif

  801.     }

  802. 

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

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

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

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

  807. 

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

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

  810. 

  811.     if (nb_components > 1) {

  812.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  823.     }

  824. 

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

  826.         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" : "",

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

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

  829. 

  830. 

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

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

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

  834. 

  835.     if(s->lossless){

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

  837. //            for(){

  838. //            reset_ls_coding_parameters(s, 0);

  839. 

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

  841.                 return -1;

  842.         }else{

  843.             if(s->rgb){

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

  845.                     return -1;

  846.             }else{

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

  848.                     return -1;

  849.             }

  850.         }

  851.     }else{

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

  853.             return -1;

  854.     }

  855.     emms_c();

  856.     return 0;

  857.  out_of_range:

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

  859.     return -1;

  860. }

  861. 

  862. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  863. {

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

  865.         return -1;

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

  867.     s->restart_count = 0;

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

  869. 

  870.     return 0;

  871. }

  872. 

  873. static int mjpeg_decode_app(MJpegDecodeContext *s)

  874. {

  875.     int len, id, i;

  876. 

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

  878.     if (len < 5)

  879.         return -1;

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

  881.         return -1;

  882. 

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

  884.     id = be2me_32(id);

  885.     len -= 6;

  886. 

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

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

  889.     }

  890. 

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

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

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

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

  895.     {

  896.         /* structure:

  897.             4bytes      AVI1

  898.             1bytes      polarity

  899.             1bytes      always zero

  900.             4bytes      field_size

  901.             4bytes      field_size_less_padding

  902.         */

  903.             s->buggy_avid = 1;

  904. //        if (s->first_picture)

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

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

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

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

  909. #if 0

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

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

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

  913.         len -= 10;

  914. #endif

  915. //        if (s->interlace_polarity)

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

  917.         goto out;

  918.     }

  919. 

  920. //    len -= 2;

  921. 

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

  923.     {

  924.         int t_w, t_h, v1, v2;

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

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

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

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

  929. 

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

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

  932. 

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

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

  935.                 v1, v2,

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

  937.                 s->avctx->sample_aspect_ratio.den

  938.             );

  939. 

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

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

  942.         if (t_w && t_h)

  943.         {

  944.             /* skip thumbnail */

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

  946.                 len -= t_w*t_h*3;

  947.         }

  948.         len -= 10;

  949.         goto out;

  950.     }

  951. 

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

  953.     {

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

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

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

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

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

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

  960.         len -= 7;

  961.         goto out;

  962.     }

  963. 

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

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

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

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

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

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

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

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

  972.         case 1:

  973.             s->rgb= 1;

  974.             s->pegasus_rct=0;

  975.             break;

  976.         case 2:

  977.             s->rgb= 1;

  978.             s->pegasus_rct=1;

  979.             break;

  980.         default:

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

  982.         }

  983.         len -= 9;

  984.         goto out;

  985.     }

  986. 

  987.     /* Apple MJPEG-A */

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

  989.     {

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

  991.         id = be2me_32(id);

  992.         len -= 4;

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

  994.         {

  995. #if 0

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

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

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

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

  1000.             skip_bits(&s->gb, 32); /* huff off */

  1001.             skip_bits(&s->gb, 32); /* image off */

  1002.             skip_bits(&s->gb, 32); /* scan off */

  1003.             skip_bits(&s->gb, 32); /* data off */

  1004. #endif

  1005.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1006.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1007.         }

  1008.     }

  1009. 

  1010. out:

  1011.     /* slow but needed for extreme adobe jpegs */

  1012.     if (len < 0)

  1013.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1014.     while(--len > 0)

  1015.         skip_bits(&s->gb, 8);

  1016. 

  1017.     return 0;

  1018. }

  1019. 

  1020. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1021. {

  1022.     int len = get_bits(&s->gb, 16);

  1023.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1024.         char *cbuf = av_malloc(len - 1);

  1025.         if (cbuf) {

  1026.             int i;

  1027.             for (i = 0; i < len - 2; i++)

  1028.                 cbuf[i] = get_bits(&s->gb, 8);

  1029.             if (i > 0 && cbuf[i-1] == '\n')

  1030.                 cbuf[i-1] = 0;

  1031.             else

  1032.                 cbuf[i] = 0;

  1033. 

  1034.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1035.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1036. 

  1037.             /* buggy avid, it puts EOI only at every 10th frame */

  1038.             if (!strcmp(cbuf, "AVID"))

  1039.             {

  1040.                 s->buggy_avid = 1;

  1041.                 //        if (s->first_picture)

  1042.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1043.             }

  1044.             else if(!strcmp(cbuf, "CS=ITU601")){

  1045.                 s->cs_itu601= 1;

  1046.             }

  1047. 

  1048.             av_free(cbuf);

  1049.         }

  1050.     }

  1051. 

  1052.     return 0;

  1053. }

  1054. 

  1055. #if 0

  1056. static int valid_marker_list[] =

  1057. {

  1058.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1059. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1060. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1061. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1062. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1063. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1064. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1065. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1066. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1067. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1068. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1069. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1070. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1071. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1072. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1073. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1074. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1075. }

  1076. #endif

  1077. 

  1078. /* return the 8 bit start code value and update the search

  1079.    state. Return -1 if no start code found */

  1080. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1081. {

  1082.     const uint8_t *buf_ptr;

  1083.     unsigned int v, v2;

  1084.     int val;

  1085. #ifdef DEBUG

  1086.     int skipped=0;

  1087. #endif

  1088. 

  1089.     buf_ptr = *pbuf_ptr;

  1090.     while (buf_ptr < buf_end) {

  1091.         v = *buf_ptr++;

  1092.         v2 = *buf_ptr;

  1093.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1094.             val = *buf_ptr++;

  1095.             goto found;

  1096.         }

  1097. #ifdef DEBUG

  1098.         skipped++;

  1099. #endif

  1100.     }

  1101.     val = -1;

  1102. found:

  1103. #ifdef DEBUG

  1104.     av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);

  1105. #endif

  1106.     *pbuf_ptr = buf_ptr;

  1107.     return val;

  1108. }

  1109. 

  1110. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1111.                               void *data, int *data_size,

  1112.                               const uint8_t *buf, int buf_size)

  1113. {

  1114.     MJpegDecodeContext *s = avctx->priv_data;

  1115.     const uint8_t *buf_end, *buf_ptr;

  1116.     int start_code;

  1117.     AVFrame *picture = data;

  1118. 

  1119.     buf_ptr = buf;

  1120.     buf_end = buf + buf_size;

  1121.     while (buf_ptr < buf_end) {

  1122.         /* find start next marker */

  1123.         start_code = find_marker(&buf_ptr, buf_end);

  1124.         {

  1125.             /* EOF */

  1126.             if (start_code < 0) {

  1127.                 goto the_end;

  1128.             } else {

  1129.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1130. 

  1131.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1132.                 {

  1133.                     av_free(s->buffer);

  1134.                     s->buffer_size = buf_end-buf_ptr;

  1135.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1136.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1137.                         s->buffer_size);

  1138.                 }

  1139. 

  1140.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1141.                 if (start_code == SOS && !s->ls)

  1142.                 {

  1143.                     const uint8_t *src = buf_ptr;

  1144.                     uint8_t *dst = s->buffer;

  1145. 

  1146.                     while (src<buf_end)

  1147.                     {

  1148.                         uint8_t x = *(src++);

  1149. 

  1150.                         *(dst++) = x;

  1151.                         if (avctx->codec_id != CODEC_ID_THP)

  1152.                         {

  1153.                             if (x == 0xff) {

  1154.                                 while (src < buf_end && x == 0xff)

  1155.                                     x = *(src++);

  1156. 

  1157.                                 if (x >= 0xd0 && x <= 0xd7)

  1158.                                     *(dst++) = x;

  1159.                                 else if (x)

  1160.                                     break;

  1161.                             }

  1162.                         }

  1163.                     }

  1164.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1165. 

  1166.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1167.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1168.                 }

  1169.                 else if(start_code == SOS && s->ls){

  1170.                     const uint8_t *src = buf_ptr;

  1171.                     uint8_t *dst = s->buffer;

  1172.                     int bit_count = 0;

  1173.                     int t = 0, b = 0;

  1174.                     PutBitContext pb;

  1175. 

  1176.                     s->cur_scan++;

  1177. 

  1178.                     /* find marker */

  1179.                     while (src + t < buf_end){

  1180.                         uint8_t x = src[t++];

  1181.                         if (x == 0xff){

  1182.                             while((src + t < buf_end) && x == 0xff)

  1183.                                 x = src[t++];

  1184.                             if (x & 0x80) {

  1185.                                 t -= 2;

  1186.                                 break;

  1187.                             }

  1188.                         }

  1189.                     }

  1190.                     bit_count = t * 8;

  1191. 

  1192.                     init_put_bits(&pb, dst, t);

  1193. 

  1194.                     /* unescape bitstream */

  1195.                     while(b < t){

  1196.                         uint8_t x = src[b++];

  1197.                         put_bits(&pb, 8, x);

  1198.                         if(x == 0xFF){

  1199.                             x = src[b++];

  1200.                             put_bits(&pb, 7, x);

  1201.                             bit_count--;

  1202.                         }

  1203.                     }

  1204.                     flush_put_bits(&pb);

  1205. 

  1206.                     init_get_bits(&s->gb, dst, bit_count);

  1207.                 }

  1208.                 else

  1209.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1210. 

  1211.                 s->start_code = start_code;

  1212.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1213.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1214.                 }

  1215. 

  1216.                 /* process markers */

  1217.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1218.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1219.                     /* APP fields */

  1220.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1221.                     mjpeg_decode_app(s);

  1222.                     /* Comment */

  1223.                 } else if (start_code == COM){

  1224.                     mjpeg_decode_com(s);

  1225.                 }

  1226. 

  1227.                 switch(start_code) {

  1228.                 case SOI:

  1229.                     s->restart_interval = 0;

  1230. 

  1231.                     s->restart_count = 0;

  1232.                     /* nothing to do on SOI */

  1233.                     break;

  1234.                 case DQT:

  1235.                     ff_mjpeg_decode_dqt(s);

  1236.                     break;

  1237.                 case DHT:

  1238.                     if(ff_mjpeg_decode_dht(s) < 0){

  1239.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1240.                         return -1;

  1241.                     }

  1242.                     break;

  1243.                 case SOF0:

  1244.                     s->lossless=0;

  1245.                     s->ls=0;

  1246.                     s->progressive=0;

  1247.                     if (ff_mjpeg_decode_sof(s) < 0)

  1248.                         return -1;

  1249.                     break;

  1250.                 case SOF2:

  1251.                     s->lossless=0;

  1252.                     s->ls=0;

  1253.                     s->progressive=1;

  1254.                     if (ff_mjpeg_decode_sof(s) < 0)

  1255.                         return -1;

  1256.                     break;

  1257.                 case SOF3:

  1258.                     s->lossless=1;

  1259.                     s->ls=0;

  1260.                     s->progressive=0;

  1261.                     if (ff_mjpeg_decode_sof(s) < 0)

  1262.                         return -1;

  1263.                     break;

  1264.                 case SOF48:

  1265.                     s->lossless=1;

  1266.                     s->ls=1;

  1267.                     s->progressive=0;

  1268.                     if (ff_mjpeg_decode_sof(s) < 0)

  1269.                         return -1;

  1270.                     break;

  1271.                 case LSE:

  1272.                     if (!ENABLE_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1273.                         return -1;

  1274.                     break;

  1275.                 case EOI:

  1276.                     s->cur_scan = 0;

  1277.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1278.                         break;

  1279. eoi_parser:

  1280.                     {

  1281.                         if (s->interlaced) {

  1282.                             s->bottom_field ^= 1;

  1283.                             /* if not bottom field, do not output image yet */

  1284.                             if (s->bottom_field == !s->interlace_polarity)

  1285.                                 goto not_the_end;

  1286.                         }

  1287.                         *picture = s->picture;

  1288.                         *data_size = sizeof(AVFrame);

  1289. 

  1290.                         if(!s->lossless){

  1291.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1292.                             picture->qstride= 0;

  1293.                             picture->qscale_table= s->qscale_table;

  1294.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1295.                             if(avctx->debug & FF_DEBUG_QP)

  1296.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1297.                             picture->quality*= FF_QP2LAMBDA;

  1298.                         }

  1299. 

  1300.                         goto the_end;

  1301.                     }

  1302.                     break;

  1303.                 case SOS:

  1304.                     ff_mjpeg_decode_sos(s);

  1305.                     /* buggy avid puts EOI every 10-20th frame */

  1306.                     /* if restart period is over process EOI */

  1307.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1308.                         goto eoi_parser;

  1309.                     break;

  1310.                 case DRI:

  1311.                     mjpeg_decode_dri(s);

  1312.                     break;

  1313.                 case SOF1:

  1314.                 case SOF5:

  1315.                 case SOF6:

  1316.                 case SOF7:

  1317.                 case SOF9:

  1318.                 case SOF10:

  1319.                 case SOF11:

  1320.                 case SOF13:

  1321.                 case SOF14:

  1322.                 case SOF15:

  1323.                 case JPG:

  1324.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1325.                     break;

  1326. //                default:

  1327. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1328. //                    break;

  1329.                 }

  1330. 

  1331. not_the_end:

  1332.                 /* eof process start code */

  1333.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1334.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1335.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1336.             }

  1337.         }

  1338.     }

  1339. the_end:

  1340.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1341. //    return buf_end - buf_ptr;

  1342.     return buf_ptr - buf;

  1343. }

  1344. 

  1345. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1346. {

  1347.     MJpegDecodeContext *s = avctx->priv_data;

  1348.     int i, j;

  1349. 

  1350.     av_free(s->buffer);

  1351.     av_free(s->qscale_table);

  1352. 

  1353.     for(i=0;i<2;i++) {

  1354.         for(j=0;j<4;j++)

  1355.             free_vlc(&s->vlcs[i][j]);

  1356.     }

  1357.     return 0;

  1358. }

  1359. 

  1360. AVCodec mjpeg_decoder = {

  1361.     "mjpeg",

  1362.     CODEC_TYPE_VIDEO,

  1363.     CODEC_ID_MJPEG,

  1364.     sizeof(MJpegDecodeContext),

  1365.     ff_mjpeg_decode_init,

  1366.     NULL,

  1367.     ff_mjpeg_decode_end,

  1368.     ff_mjpeg_decode_frame,

  1369.     CODEC_CAP_DR1,

  1370.     NULL,

  1371.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1372. };

  1373. 

  1374. AVCodec thp_decoder = {

  1375.     "thp",

  1376.     CODEC_TYPE_VIDEO,

  1377.     CODEC_ID_THP,

  1378.     sizeof(MJpegDecodeContext),

  1379.     ff_mjpeg_decode_init,

  1380.     NULL,

  1381.     ff_mjpeg_decode_end,

  1382.     ff_mjpeg_decode_frame,

  1383.     CODEC_CAP_DR1,

  1384.     NULL,

  1385.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1386. };