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FFmpeg/libavcodec/mjpegdec.c

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  1. /*

  2.  * MJPEG decoder

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

  4.  * Copyright (c) 2003 Alex Beregszaszi

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

  6.  *

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

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

  9.  *                                  by Alex Beregszaszi

  10.  *

  11.  * This file is part of FFmpeg.

  12.  *

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

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

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

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

  17.  *

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

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

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

  21.  * Lesser General Public License for more details.

  22.  *

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

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

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

  26.  */

  27. 

  28. /**

  29.  * @file mjpegdec.c

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "avcodec.h"

  37. #include "dsputil.h"

  38. #include "mjpeg.h"

  39. #include "mjpegdec.h"

  40. #include "jpeglsdec.h"

  41. 

  42. 

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

  44.                       int nb_codes, int use_static, int is_ac)

  45. {

  46.     uint8_t huff_size[256+16];

  47.     uint16_t huff_code[256+16];

  48. 

  49.     assert(nb_codes <= 256);

  50. 

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

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

  53. 

  54.     if(is_ac){

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

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

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

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

  59.         nb_codes += 16;

  60.     }

  61. 

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

  63. }

  64. 

  65. static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {

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

  67.               ff_mjpeg_val_dc_luminance, 12, 0, 0);

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

  69.               ff_mjpeg_val_dc_chrominance, 12, 0, 0);

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

  71.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

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

  73.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

  74. }

  75. 

  76. int ff_mjpeg_decode_init(AVCodecContext *avctx)

  77. {

  78.     MJpegDecodeContext *s = avctx->priv_data;

  79. 

  80.     s->avctx = avctx;

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

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

  83.     s->buffer_size = 0;

  84.     s->buffer = NULL;

  85.     s->start_code = -1;

  86.     s->first_picture = 1;

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

  88. 

  89.     build_basic_mjpeg_vlc(s);

  90. 

  91.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  92.     {

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

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

  95.         if (ff_mjpeg_decode_dht(s)) {

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

  97.             build_basic_mjpeg_vlc(s);

  98.         }

  99.     }

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

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

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

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

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

  105.         }

  106.     }

  107. 

  108.     return 0;

  109. }

  110. 

  111. 

  112. /* quantize tables */

  113. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  114. {

  115.     int len, index, i, j;

  116. 

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

  118. 

  119.     while (len >= 65) {

  120.         /* only 8 bit precision handled */

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

  122.         {

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

  124.             return -1;

  125.         }

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

  127.         if (index >= 4)

  128.             return -1;

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

  130.         /* read quant table */

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

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

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

  134.         }

  135. 

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

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

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

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

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

  141.         len -= 65;

  142.     }

  143. 

  144.     return 0;

  145. }

  146. 

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

  148. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  149. {

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

  151.     uint8_t bits_table[17];

  152.     uint8_t val_table[256];

  153. 

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

  155. 

  156.     while (len > 0) {

  157.         if (len < 17)

  158.             return -1;

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

  160.         if (class >= 2)

  161.             return -1;

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

  163.         if (index >= 4)

  164.             return -1;

  165.         n = 0;

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

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

  168.             n += bits_table[i];

  169.         }

  170.         len -= 17;

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

  172.             return -1;

  173. 

  174.         code_max = 0;

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

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

  177.             if (v > code_max)

  178.                 code_max = v;

  179.             val_table[i] = v;

  180.         }

  181.         len -= n;

  182. 

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

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

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

  186.                class, index, code_max + 1);

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

  188.             return -1;

  189.         }

  190.     }

  191.     return 0;

  192. }

  193. 

  194. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  195. {

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

  197. 

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

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

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

  201. 

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

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

  204. 

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

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

  207.         return -1;

  208.     }

  209. 

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

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

  212. 

  213.     //HACK for odd_height.mov

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

  215.         height= s->height;

  216. 

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

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

  219.         return -1;

  220. 

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

  222.     if (nb_components <= 0 ||

  223.         nb_components > MAX_COMPONENTS)

  224.         return -1;

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

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

  227.         return -1;

  228.     }

  229.     s->nb_components = nb_components;

  230.     s->h_max = 1;

  231.     s->v_max = 1;

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

  233.         /* component id */

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

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

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

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

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

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

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

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

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

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

  244.             return -1;

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

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

  247.     }

  248. 

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

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

  251.         return -1;

  252.     }

  253. 

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

  255. 

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

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

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

  259.         av_freep(&s->qscale_table);

  260. 

  261.         s->width = width;

  262.         s->height = height;

  263.         s->interlaced = 0;

  264. 

  265.         /* test interlaced mode */

  266.         if (s->first_picture &&

  267.             s->org_height != 0 &&

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

  269.             s->interlaced = 1;

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

  271.             s->picture.interlaced_frame = 1;

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

  273.             height *= 2;

  274.         }

  275. 

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

  277. 

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

  279. 

  280.         s->first_picture = 0;

  281.     }

  282. 

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

  284.         return 0;

  285. 

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

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

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

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

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

  291.     switch(pix_fmt_id){

  292.     case 0x222222:

  293.     case 0x111111:

  294.         if(s->rgb){

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

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

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

  298.         else

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

  300.         break;

  301.     case 0x121111:

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

  303.         break;

  304.     case 0x211111:

  305.     case 0x221212:

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

  307.         break;

  308.     case 0x221111:

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

  310.         break;

  311.     default:

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

  313.         return -1;

  314.     }

  315.     if(s->ls){

  316.         if(s->nb_components > 1)

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

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

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

  320.         else

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

  322.     }

  323. 

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

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

  326. 

  327.     s->picture.reference= 0;

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

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

  330.         return -1;

  331.     }

  332.     s->picture.pict_type= I_TYPE;

  333.     s->picture.key_frame= 1;

  334. 

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

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

  337.     }

  338. 

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

  340. 

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

  342.     {

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

  344.     }

  345. 

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

  347.     if(s->progressive){

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

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

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

  351.     }

  352.     return 0;

  353. }

  354. 

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

  356. {

  357.     int code;

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

  359.     if (code < 0)

  360.     {

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

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

  363.         return 0xffff;

  364.     }

  365. 

  366.     if(code)

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

  368.     else

  369.         return 0;

  370. }

  371. 

  372. /* decode block and dequantize */

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

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

  375. {

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

  377. 

  378.     /* DC coef */

  379.     val = mjpeg_decode_dc(s, dc_index);

  380.     if (val == 0xffff) {

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

  382.         return -1;

  383.     }

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

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

  386.     block[0] = val;

  387.     /* AC coefs */

  388.     i = 0;

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

  390.     for(;;) {

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

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

  393. 

  394.         /* EOB */

  395.         if (code == 0x10)

  396.             break;

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

  398.         if(code != 0x100){

  399.             code &= 0xf;

  400.             if(code > MIN_CACHE_BITS - 16){

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

  402.             }

  403.             {

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

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

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

  407.             }

  408. 

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

  410. 

  411.             if (i >= 63) {

  412.                 if(i == 63){

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

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

  415.                     break;

  416.                 }

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

  418.                 return -1;

  419.             }

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

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

  422.         }

  423.     }

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

  425. 

  426.     return 0;

  427. }

  428. 

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

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

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

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

  433. {

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

  435. 

  436.     /* DC coef */

  437.     if(!ss){

  438.         val = mjpeg_decode_dc(s, dc_index);

  439.         if (val == 0xffff) {

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

  441.             return -1;

  442.         }

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

  444.     }else

  445.         val = 0;

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

  447.     block[0] = val;

  448.     if(!se) return 0;

  449.     /* AC coefs */

  450.     if(*EOBRUN){

  451.         (*EOBRUN)--;

  452.         return 0;

  453.     }

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

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

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

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

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

  459.         code -= 16;

  460.         if(code & 0xF) {

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

  462.             code &= 0xf;

  463.             if(code > MIN_CACHE_BITS - 16){

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

  465.             }

  466.             {

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

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

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

  470.             }

  471. 

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

  473. 

  474.             if (i >= se) {

  475.                 if(i == se){

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

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

  478.                     break;

  479.                 }

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

  481.                 return -1;

  482.             }

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

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

  485.         }else{

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

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

  488.                 i += 15;

  489.             }else{

  490.                 val = run;

  491.                 run = (1 << run);

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

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

  494.                 if(val)

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

  496.                 *EOBRUN = run - 1;

  497.                 break;

  498.             }

  499.         }

  500.     }

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

  502. 

  503.     return 0;

  504. }

  505. 

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

  507.     int i, mb_x, mb_y;

  508.     uint16_t buffer[32768][4];

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

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

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

  512. 

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

  514.         return -1;

  515. 

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

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

  518.     }

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

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

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

  522. 

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

  524.             ptr += linesize >> 1;

  525. 

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

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

  528.         }

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

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

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

  532. 

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

  534.                 int pred;

  535. 

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

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

  538. 

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

  540. 

  541.                 left[i]=

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

  543.             }

  544. 

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

  546.                 align_get_bits(&s->gb);

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

  548.             }

  549.         }

  550. 

  551.         if(s->rct){

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

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

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

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

  556.             }

  557.         }else if(s->pegasus_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])>>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{

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

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

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

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

  568.             }

  569.         }

  570.     }

  571.     return 0;

  572. }

  573. 

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

  575.     int i, mb_x, mb_y;

  576.     const int nb_components=3;

  577. 

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

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

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

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

  582. 

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

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

  585.                     uint8_t *ptr;

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

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

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

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

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

  591.                     x = 0;

  592.                     y = 0;

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

  594. 

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

  596.                         int pred;

  597. 

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

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

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

  601.                                 pred= 128 << point_transform;

  602.                             }else{

  603.                                 pred= ptr[-1];

  604.                             }

  605.                         }else{

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

  607.                                 pred= ptr[-linesize];

  608.                             }else{

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

  610.                             }

  611.                         }

  612. 

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

  614.                             ptr += linesize >> 1;

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

  616. 

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

  618.                             x = 0;

  619.                             y++;

  620.                         }

  621.                     }

  622.                 }

  623.             }else{

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

  625.                     uint8_t *ptr;

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

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

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

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

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

  631.                     x = 0;

  632.                     y = 0;

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

  634. 

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

  636.                         int pred;

  637. 

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

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

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

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

  642.                             x = 0;

  643.                             y++;

  644.                         }

  645.                     }

  646.                 }

  647.             }

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

  649.                 align_get_bits(&s->gb);

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

  651.             }

  652.         }

  653.     }

  654.     return 0;

  655. }

  656. 

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

  658.     int i, mb_x, mb_y;

  659.     int EOBRUN = 0;

  660. 

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

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

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

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

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

  666. 

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

  668.                 uint8_t *ptr;

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

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

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

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

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

  674.                 x = 0;

  675.                 y = 0;

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

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

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

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

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

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

  682.                         return -1;

  683.                     }

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

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

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

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

  688.                         return -1;

  689.                     }

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

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

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

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

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

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

  696. //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);

  697.                     if(!s->progressive)

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

  699.                     else

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

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

  702.                         x = 0;

  703.                         y++;

  704.                     }

  705.                 }

  706.             }

  707.             /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

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

  709.                 !--s->restart_count) {

  710.                 align_get_bits(&s->gb);

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

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

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

  714.             }

  715.         }

  716.     }

  717.     return 0;

  718. }

  719. 

  720. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  721. {

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

  723.     int vmax, hmax, index, id;

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

  725.     int ilv, prev_shift;

  726. 

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

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

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

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

  731.     {

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

  733.         return -1;

  734.     }

  735.     vmax = 0;

  736.     hmax = 0;

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

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

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

  740.         /* find component index */

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

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

  743.                 break;

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

  745.         {

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

  747.             return -1;

  748.         }

  749. 

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

  751. 

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

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

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

  755. 

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

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

  758. 

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

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

  761.             goto out_of_range;

  762. #if 0 //buggy

  763.         switch(s->start_code)

  764.         {

  765.             case SOF0:

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

  767.                     goto out_of_range;

  768.                 break;

  769.             case SOF1:

  770.             case SOF2:

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

  772.                     goto out_of_range;

  773.                 break;

  774.             case SOF3:

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

  776.                     goto out_of_range;

  777.                 break;

  778.         }

  779. #endif

  780.     }

  781. 

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

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

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

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

  786. 

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

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

  789. 

  790.     if (nb_components > 1) {

  791.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  802.     }

  803. 

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

  805.         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" : "",

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

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

  808. 

  809. 

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

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

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

  813. 

  814.     if(s->lossless){

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

  816. //            for(){

  817. //            reset_ls_coding_parameters(s, 0);

  818. 

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

  820.         }else{

  821.             if(s->rgb){

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

  823.                     return -1;

  824.             }else{

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

  826.                     return -1;

  827.             }

  828.         }

  829.     }else{

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

  831.             return -1;

  832.     }

  833.     emms_c();

  834.     return 0;

  835.  out_of_range:

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

  837.     return -1;

  838. }

  839. 

  840. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  841. {

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

  843.         return -1;

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

  845.     s->restart_count = 0;

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

  847. 

  848.     return 0;

  849. }

  850. 

  851. static int mjpeg_decode_app(MJpegDecodeContext *s)

  852. {

  853.     int len, id, i;

  854. 

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

  856.     if (len < 5)

  857.         return -1;

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

  859.         return -1;

  860. 

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

  862.     id = be2me_32(id);

  863.     len -= 6;

  864. 

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

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

  867.     }

  868. 

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

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

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

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

  873.     {

  874.         /* structure:

  875.             4bytes      AVI1

  876.             1bytes      polarity

  877.             1bytes      always zero

  878.             4bytes      field_size

  879.             4bytes      field_size_less_padding

  880.         */

  881.             s->buggy_avid = 1;

  882. //        if (s->first_picture)

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

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

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

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

  887. #if 0

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

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

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

  891.         len -= 10;

  892. #endif

  893. //        if (s->interlace_polarity)

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

  895.         goto out;

  896.     }

  897. 

  898. //    len -= 2;

  899. 

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

  901.     {

  902.         int t_w, t_h, v1, v2;

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

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

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

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

  907. 

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

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

  910. 

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

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

  913.                 v1, v2,

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

  915.                 s->avctx->sample_aspect_ratio.den

  916.             );

  917. 

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

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

  920.         if (t_w && t_h)

  921.         {

  922.             /* skip thumbnail */

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

  924.                 len -= t_w*t_h*3;

  925.         }

  926.         len -= 10;

  927.         goto out;

  928.     }

  929. 

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

  931.     {

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

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

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

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

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

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

  938.         len -= 7;

  939.         goto out;

  940.     }

  941. 

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

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

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

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

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

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

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

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

  950.         case 1:

  951.             s->rgb= 1;

  952.             s->pegasus_rct=0;

  953.             break;

  954.         case 2:

  955.             s->rgb= 1;

  956.             s->pegasus_rct=1;

  957.             break;

  958.         default:

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

  960.         }

  961.         len -= 9;

  962.         goto out;

  963.     }

  964. 

  965.     /* Apple MJPEG-A */

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

  967.     {

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

  969.         id = be2me_32(id);

  970.         len -= 4;

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

  972.         {

  973. #if 0

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

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

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

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

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

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

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

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

  982. #endif

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

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

  985.         }

  986.     }

  987. 

  988. out:

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

  990.     if (len < 0)

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

  992.     while(--len > 0)

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

  994. 

  995.     return 0;

  996. }

  997. 

  998. static int mjpeg_decode_com(MJpegDecodeContext *s)

  999. {

  1000.     int len = get_bits(&s->gb, 16);

  1001.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1002.         char *cbuf = av_malloc(len - 1);

  1003.         if (cbuf) {

  1004.             int i;

  1005.             for (i = 0; i < len - 2; i++)

  1006.                 cbuf[i] = get_bits(&s->gb, 8);

  1007.             if (i > 0 && cbuf[i-1] == '\n')

  1008.                 cbuf[i-1] = 0;

  1009.             else

  1010.                 cbuf[i] = 0;

  1011. 

  1012.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1013.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1014. 

  1015.             /* buggy avid, it puts EOI only at every 10th frame */

  1016.             if (!strcmp(cbuf, "AVID"))

  1017.             {

  1018.                 s->buggy_avid = 1;

  1019.                 //        if (s->first_picture)

  1020.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1021.             }

  1022.             else if(!strcmp(cbuf, "CS=ITU601")){

  1023.                 s->cs_itu601= 1;

  1024.             }

  1025. 

  1026.             av_free(cbuf);

  1027.         }

  1028.     }

  1029. 

  1030.     return 0;

  1031. }

  1032. 

  1033. #if 0

  1034. static int valid_marker_list[] =

  1035. {

  1036.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

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

  1038. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1039. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1040. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1041. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1042. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1043. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1044. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1045. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1046. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1047. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1048. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1049. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1050. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1051. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1052. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1053. }

  1054. #endif

  1055. 

  1056. /* return the 8 bit start code value and update the search

  1057.    state. Return -1 if no start code found */

  1058. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1059. {

  1060.     uint8_t *buf_ptr;

  1061.     unsigned int v, v2;

  1062.     int val;

  1063. #ifdef DEBUG

  1064.     int skipped=0;

  1065. #endif

  1066. 

  1067.     buf_ptr = *pbuf_ptr;

  1068.     while (buf_ptr < buf_end) {

  1069.         v = *buf_ptr++;

  1070.         v2 = *buf_ptr;

  1071.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1072.             val = *buf_ptr++;

  1073.             goto found;

  1074.         }

  1075. #ifdef DEBUG

  1076.         skipped++;

  1077. #endif

  1078.     }

  1079.     val = -1;

  1080. found:

  1081. #ifdef DEBUG

  1082.     av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);

  1083. #endif

  1084.     *pbuf_ptr = buf_ptr;

  1085.     return val;

  1086. }

  1087. 

  1088. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1089.                               void *data, int *data_size,

  1090.                               uint8_t *buf, int buf_size)

  1091. {

  1092.     MJpegDecodeContext *s = avctx->priv_data;

  1093.     uint8_t *buf_end, *buf_ptr;

  1094.     int start_code;

  1095.     AVFrame *picture = data;

  1096. 

  1097.     buf_ptr = buf;

  1098.     buf_end = buf + buf_size;

  1099.     while (buf_ptr < buf_end) {

  1100.         /* find start next marker */

  1101.         start_code = find_marker(&buf_ptr, buf_end);

  1102.         {

  1103.             /* EOF */

  1104.             if (start_code < 0) {

  1105.                 goto the_end;

  1106.             } else {

  1107.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1108. 

  1109.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1110.                 {

  1111.                     av_free(s->buffer);

  1112.                     s->buffer_size = buf_end-buf_ptr;

  1113.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1114.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1115.                         s->buffer_size);

  1116.                 }

  1117. 

  1118.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1119.                 if (start_code == SOS && !s->ls)

  1120.                 {

  1121.                     uint8_t *src = buf_ptr;

  1122.                     uint8_t *dst = s->buffer;

  1123. 

  1124.                     while (src<buf_end)

  1125.                     {

  1126.                         uint8_t x = *(src++);

  1127. 

  1128.                         *(dst++) = x;

  1129.                         if (avctx->codec_id != CODEC_ID_THP)

  1130.                         {

  1131.                             if (x == 0xff) {

  1132.                                 while (src < buf_end && x == 0xff)

  1133.                                     x = *(src++);

  1134. 

  1135.                                 if (x >= 0xd0 && x <= 0xd7)

  1136.                                     *(dst++) = x;

  1137.                                 else if (x)

  1138.                                     break;

  1139.                             }

  1140.                         }

  1141.                     }

  1142.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1143. 

  1144.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1145.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1146.                 }

  1147.                 else if(start_code == SOS && s->ls){

  1148.                     uint8_t *src = buf_ptr;

  1149.                     uint8_t *dst = s->buffer;

  1150.                     int bit_count = 0;

  1151.                     int t = 0, b = 0;

  1152.                     PutBitContext pb;

  1153. 

  1154.                     s->cur_scan++;

  1155. 

  1156.                     /* find marker */

  1157.                     while (src + t < buf_end){

  1158.                         uint8_t x = src[t++];

  1159.                         if (x == 0xff){

  1160.                             while((src + t < buf_end) && x == 0xff)

  1161.                                 x = src[t++];

  1162.                             if (x & 0x80) {

  1163.                                 t -= 2;

  1164.                                 break;

  1165.                             }

  1166.                         }

  1167.                     }

  1168.                     bit_count = t * 8;

  1169. 

  1170.                     init_put_bits(&pb, dst, t);

  1171. 

  1172.                     /* unescape bitstream */

  1173.                     while(b < t){

  1174.                         uint8_t x = src[b++];

  1175.                         put_bits(&pb, 8, x);

  1176.                         if(x == 0xFF){

  1177.                             x = src[b++];

  1178.                             put_bits(&pb, 7, x);

  1179.                             bit_count--;

  1180.                         }

  1181.                     }

  1182.                     flush_put_bits(&pb);

  1183. 

  1184.                     init_get_bits(&s->gb, dst, bit_count);

  1185.                 }

  1186.                 else

  1187.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1188. 

  1189.                 s->start_code = start_code;

  1190.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1191.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1192.                 }

  1193. 

  1194.                 /* process markers */

  1195.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1196.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1197.                     /* APP fields */

  1198.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1199.                     mjpeg_decode_app(s);

  1200.                     /* Comment */

  1201.                 } else if (start_code == COM){

  1202.                     mjpeg_decode_com(s);

  1203.                 }

  1204. 

  1205.                 switch(start_code) {

  1206.                 case SOI:

  1207.                     s->restart_interval = 0;

  1208. 

  1209.                     s->restart_count = 0;

  1210.                     /* nothing to do on SOI */

  1211.                     break;

  1212.                 case DQT:

  1213.                     ff_mjpeg_decode_dqt(s);

  1214.                     break;

  1215.                 case DHT:

  1216.                     if(ff_mjpeg_decode_dht(s) < 0){

  1217.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1218.                         return -1;

  1219.                     }

  1220.                     break;

  1221.                 case SOF0:

  1222.                     s->lossless=0;

  1223.                     s->ls=0;

  1224.                     s->progressive=0;

  1225.                     if (ff_mjpeg_decode_sof(s) < 0)

  1226.                         return -1;

  1227.                     break;

  1228.                 case SOF2:

  1229.                     s->lossless=0;

  1230.                     s->ls=0;

  1231.                     s->progressive=1;

  1232.                     if (ff_mjpeg_decode_sof(s) < 0)

  1233.                         return -1;

  1234.                     break;

  1235.                 case SOF3:

  1236.                     s->lossless=1;

  1237.                     s->ls=0;

  1238.                     s->progressive=0;

  1239.                     if (ff_mjpeg_decode_sof(s) < 0)

  1240.                         return -1;

  1241.                     break;

  1242.                 case SOF48:

  1243.                     s->lossless=1;

  1244.                     s->ls=1;

  1245.                     s->progressive=0;

  1246.                     if (ff_mjpeg_decode_sof(s) < 0)

  1247.                         return -1;

  1248.                     break;

  1249.                 case LSE:

  1250.                     if (!ENABLE_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1251.                         return -1;

  1252.                     break;

  1253.                 case EOI:

  1254.                     s->cur_scan = 0;

  1255.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1256.                         break;

  1257. eoi_parser:

  1258.                     {

  1259.                         if (s->interlaced) {

  1260.                             s->bottom_field ^= 1;

  1261.                             /* if not bottom field, do not output image yet */

  1262.                             if (s->bottom_field == !s->interlace_polarity)

  1263.                                 goto not_the_end;

  1264.                         }

  1265.                         *picture = s->picture;

  1266.                         *data_size = sizeof(AVFrame);

  1267. 

  1268.                         if(!s->lossless){

  1269.                             picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);

  1270.                             picture->qstride= 0;

  1271.                             picture->qscale_table= s->qscale_table;

  1272.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1273.                             if(avctx->debug & FF_DEBUG_QP)

  1274.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1275.                             picture->quality*= FF_QP2LAMBDA;

  1276.                         }

  1277. 

  1278.                         goto the_end;

  1279.                     }

  1280.                     break;

  1281.                 case SOS:

  1282.                     ff_mjpeg_decode_sos(s);

  1283.                     /* buggy avid puts EOI every 10-20th frame */

  1284.                     /* if restart period is over process EOI */

  1285.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1286.                         goto eoi_parser;

  1287.                     break;

  1288.                 case DRI:

  1289.                     mjpeg_decode_dri(s);

  1290.                     break;

  1291.                 case SOF1:

  1292.                 case SOF5:

  1293.                 case SOF6:

  1294.                 case SOF7:

  1295.                 case SOF9:

  1296.                 case SOF10:

  1297.                 case SOF11:

  1298.                 case SOF13:

  1299.                 case SOF14:

  1300.                 case SOF15:

  1301.                 case JPG:

  1302.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1303.                     break;

  1304. //                default:

  1305. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1306. //                    break;

  1307.                 }

  1308. 

  1309. not_the_end:

  1310.                 /* eof process start code */

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

  1312.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1313.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1314.             }

  1315.         }

  1316.     }

  1317. the_end:

  1318.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1319. //    return buf_end - buf_ptr;

  1320.     return buf_ptr - buf;

  1321. }

  1322. 

  1323. int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1324. {

  1325.     MJpegDecodeContext *s = avctx->priv_data;

  1326.     int i, j;

  1327. 

  1328.     av_free(s->buffer);

  1329.     av_free(s->qscale_table);

  1330. 

  1331.     for(i=0;i<2;i++) {

  1332.         for(j=0;j<4;j++)

  1333.             free_vlc(&s->vlcs[i][j]);

  1334.     }

  1335.     return 0;

  1336. }

  1337. 

  1338. AVCodec mjpeg_decoder = {

  1339.     "mjpeg",

  1340.     CODEC_TYPE_VIDEO,

  1341.     CODEC_ID_MJPEG,

  1342.     sizeof(MJpegDecodeContext),

  1343.     ff_mjpeg_decode_init,

  1344.     NULL,

  1345.     ff_mjpeg_decode_end,

  1346.     ff_mjpeg_decode_frame,

  1347.     CODEC_CAP_DR1,

  1348.     NULL

  1349. };

  1350. 

  1351. AVCodec thp_decoder = {

  1352.     "thp",

  1353.     CODEC_TYPE_VIDEO,

  1354.     CODEC_ID_THP,

  1355.     sizeof(MJpegDecodeContext),

  1356.     ff_mjpeg_decode_init,

  1357.     NULL,

  1358.     ff_mjpeg_decode_end,

  1359.     ff_mjpeg_decode_frame,

  1360.     CODEC_CAP_DR1,

  1361.     NULL

  1362. };