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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

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "libavutil/imgutils.h"

  37. #include "avcodec.h"

  38. #include "dsputil.h"

  39. #include "mjpeg.h"

  40. #include "mjpegdec.h"

  41. #include "jpeglsdec.h"

  42. 

  43. 

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

  45.                       int nb_codes, int use_static, int is_ac)

  46. {

  47.     uint8_t huff_size[256];

  48.     uint16_t huff_code[256];

  49.     uint16_t huff_sym[256];

  50.     int i;

  51. 

  52.     assert(nb_codes <= 256);

  53. 

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

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

  56. 

  57.     for(i=0; i<256; i++)

  58.         huff_sym[i]= i + 16*is_ac;

  59. 

  60.     if(is_ac) huff_sym[0]= 16*256;

  61. 

  62.     return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 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.     build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,

  75.               ff_mjpeg_val_ac_luminance, 251, 0, 0);

  76.     build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,

  77.               ff_mjpeg_val_ac_chrominance, 251, 0, 0);

  78. }

  79. 

  80. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  81. {

  82.     MJpegDecodeContext *s = avctx->priv_data;

  83. 

  84.     s->avctx = avctx;

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

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

  87.     s->buffer_size = 0;

  88.     s->buffer = NULL;

  89.     s->start_code = -1;

  90.     s->first_picture = 1;

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

  92.     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;

  93. 

  94.     build_basic_mjpeg_vlc(s);

  95. 

  96.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  97.     {

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

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

  100.         if (ff_mjpeg_decode_dht(s)) {

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

  102.             build_basic_mjpeg_vlc(s);

  103.         }

  104.     }

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

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

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

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

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

  110.         }

  111.     }

  112.     if (avctx->codec->id == CODEC_ID_AMV)

  113.         s->flipped = 1;

  114. 

  115.     return 0;

  116. }

  117. 

  118. 

  119. /* quantize tables */

  120. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  121. {

  122.     int len, index, i, j;

  123. 

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

  125. 

  126.     while (len >= 65) {

  127.         /* only 8 bit precision handled */

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

  129.         {

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

  131.             return -1;

  132.         }

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

  134.         if (index >= 4)

  135.             return -1;

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

  137.         /* read quant table */

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

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

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

  141.         }

  142. 

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

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

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

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

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

  148.         len -= 65;

  149.     }

  150. 

  151.     return 0;

  152. }

  153. 

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

  155. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  156. {

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

  158.     uint8_t bits_table[17];

  159.     uint8_t val_table[256];

  160. 

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

  162. 

  163.     while (len > 0) {

  164.         if (len < 17)

  165.             return -1;

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

  167.         if (class >= 2)

  168.             return -1;

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

  170.         if (index >= 4)

  171.             return -1;

  172.         n = 0;

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

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

  175.             n += bits_table[i];

  176.         }

  177.         len -= 17;

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

  179.             return -1;

  180. 

  181.         code_max = 0;

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

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

  184.             if (v > code_max)

  185.                 code_max = v;

  186.             val_table[i] = v;

  187.         }

  188.         len -= n;

  189. 

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

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

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

  193.                class, index, code_max + 1);

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

  195.             return -1;

  196.         }

  197. 

  198.         if(class>0){

  199.             free_vlc(&s->vlcs[2][index]);

  200.             if(build_vlc(&s->vlcs[2][index], bits_table, val_table, code_max + 1, 0, 0) < 0){

  201.             return -1;

  202.             }

  203.         }

  204.     }

  205.     return 0;

  206. }

  207. 

  208. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  209. {

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

  211. 

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

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

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

  215. 

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

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

  218. 

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

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

  221.         return -1;

  222.     }

  223. 

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

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

  226. 

  227.     //HACK for odd_height.mov

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

  229.         height= s->height;

  230. 

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

  232.     if(av_image_check_size(width, height, 0, s->avctx))

  233.         return -1;

  234. 

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

  236.     if (nb_components <= 0 ||

  237.         nb_components > MAX_COMPONENTS)

  238.         return -1;

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

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

  241.         return -1;

  242.     }

  243.     s->nb_components = nb_components;

  244.     s->h_max = 1;

  245.     s->v_max = 1;

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

  247.         /* component id */

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

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

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

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

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

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

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

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

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

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

  258.             return -1;

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

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

  261.     }

  262. 

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

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

  265.         return -1;

  266.     }

  267. 

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

  269. 

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

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

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

  273.         av_freep(&s->qscale_table);

  274. 

  275.         s->width = width;

  276.         s->height = height;

  277.         s->interlaced = 0;

  278. 

  279.         /* test interlaced mode */

  280.         if (s->first_picture &&

  281.             s->org_height != 0 &&

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

  283.             s->interlaced = 1;

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

  285.             s->picture.interlaced_frame = 1;

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

  287.             height *= 2;

  288.         }

  289. 

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

  291. 

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

  293. 

  294.         s->first_picture = 0;

  295.     }

  296. 

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

  298.         return 0;

  299. 

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

  301.     pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |

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

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

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

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

  306.     //NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4

  307.     if(!(pix_fmt_id & 0xD0D0D0D0))

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

  309.     if(!(pix_fmt_id & 0x0D0D0D0D))

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

  311. 

  312.     switch(pix_fmt_id){

  313.     case 0x11111100:

  314.         if(s->rgb){

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

  316.         }else

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

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

  319.         break;

  320.     case 0x11000000:

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

  322.         break;

  323.     case 0x12111100:

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

  325.         break;

  326.     case 0x21111100:

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

  328.         break;

  329.     case 0x22111100:

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

  331.         break;

  332.     default:

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

  334.         return -1;

  335.     }

  336.     if(s->ls){

  337.         if(s->nb_components > 1)

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

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

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

  341.         else

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

  343.     }

  344. 

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

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

  347. 

  348.     s->picture.reference= 0;

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

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

  351.         return -1;

  352.     }

  353.     s->picture.pict_type= FF_I_TYPE;

  354.     s->picture.key_frame= 1;

  355.     s->got_picture = 1;

  356. 

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

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

  359.     }

  360. 

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

  362. 

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

  364.     {

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

  366.     }

  367. 

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

  369.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  379.         }

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

  381.     }

  382.     return 0;

  383. }

  384. 

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

  386. {

  387.     int code;

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

  389.     if (code < 0)

  390.     {

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

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

  393.         return 0xffff;

  394.     }

  395. 

  396.     if(code)

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

  398.     else

  399.         return 0;

  400. }

  401. 

  402. /* decode block and dequantize */

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

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

  405. {

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

  407. 

  408.     /* DC coef */

  409.     val = mjpeg_decode_dc(s, dc_index);

  410.     if (val == 0xffff) {

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

  412.         return -1;

  413.     }

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

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

  416.     block[0] = val;

  417.     /* AC coefs */

  418.     i = 0;

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

  420.     do {

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

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

  423. 

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

  425.             code &= 0xf;

  426.         if(code){

  427.             if(code > MIN_CACHE_BITS - 16){

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

  429.             }

  430.             {

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

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

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

  434.             }

  435. 

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

  437. 

  438.             if (i > 63) {

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

  440.                 return -1;

  441.             }

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

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

  444.         }

  445.     }while(i<63);

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

  447. 

  448.     return 0;

  449. }

  450. 

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

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

  453. {

  454.     int val;

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

  456.     val = mjpeg_decode_dc(s, dc_index);

  457.     if (val == 0xffff) {

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

  459.         return -1;

  460.     }

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

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

  463.     block[0] = val;

  464.     return 0;

  465. }

  466. 

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

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

  469.                                     int ac_index, int16_t *quant_matrix,

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

  471. {

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

  473. 

  474.     if(*EOBRUN){

  475.         (*EOBRUN)--;

  476.         return 0;

  477.     }

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

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

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

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

  482. 

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

  484.         code &= 0xF;

  485.         if(code) {

  486.             i += run;

  487.             if(code > MIN_CACHE_BITS - 16){

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

  489.             }

  490.             {

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

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

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

  494.             }

  495. 

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

  497. 

  498.             if (i >= se) {

  499.                 if(i == se){

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

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

  502.                     break;

  503.                 }

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

  505.                 return -1;

  506.             }

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

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

  509.         }else{

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

  511.                 i += 15;

  512.                 if (i >= se) {

  513.                     av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);

  514.                     return -1;

  515.                 }

  516.             }else{

  517.                 val = (1 << run);

  518.                 if(run){

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

  520.                     val += NEG_USR32(GET_CACHE(re, &s->gb), run);

  521.                     LAST_SKIP_BITS(re, &s->gb, run);

  522.                 }

  523.                 *EOBRUN = val - 1;

  524.                 break;

  525.             }

  526.         }

  527.     }

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

  529.     if(i > *last_nnz)

  530.         *last_nnz = i;

  531.     return 0;

  532. }

  533. 

  534. #define REFINE_BIT(j) {\

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

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

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

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

  539. }

  540. 

  541. #define ZERO_RUN \

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

  543.     if(i > last) {\

  544.         i += run;\

  545.         if(i > se) {\

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

  547.             return -1;\

  548.         }\

  549.         break;\

  550.     }\

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

  552.     if(block[j])\

  553.         REFINE_BIT(j)\

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

  555.         break;\

  556. }

  557. 

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

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

  560.                         int ac_index, int16_t *quant_matrix,

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

  562. {

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

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

  565. 

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

  567.     if(*EOBRUN)

  568.         (*EOBRUN)--;

  569.     else {

  570.         for(;;i++) {

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

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

  573. 

  574.             if(code & 0xF) {

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

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

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

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

  579.                 ZERO_RUN;

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

  581.                 val--;

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

  583.                 if(i == se) {

  584.                     if(i > *last_nnz)

  585.                         *last_nnz = i;

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

  587.                     return 0;

  588.                 }

  589.             }else{

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

  591.                 if(run == 0xF){

  592.                     ZERO_RUN;

  593.                 }else{

  594.                     val = run;

  595.                     run = (1 << run);

  596.                     if(val) {

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

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

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

  600.                     }

  601.                     *EOBRUN = run - 1;

  602.                     break;

  603.                 }

  604.             }

  605.         }

  606. 

  607.         if(i > *last_nnz)

  608.             *last_nnz = i;

  609.     }

  610. 

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

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

  613.         if(block[j])

  614.             REFINE_BIT(j)

  615.     }

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

  617. 

  618.     return 0;

  619. }

  620. #undef REFINE_BIT

  621. #undef ZERO_RUN

  622. 

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

  624.     int i, mb_x, mb_y;

  625.     uint16_t (*buffer)[4];

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

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

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

  629. 

  630.     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));

  631.     buffer= s->ljpeg_buffer;

  632. 

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

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

  635.     }

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

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

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

  639. 

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

  641.             ptr += linesize >> 1;

  642. 

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

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

  645.         }

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

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

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

  649. 

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

  651.                 int pred;

  652. 

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

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

  655. 

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

  657. 

  658.                 left[i]=

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

  660.             }

  661. 

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

  663.                 align_get_bits(&s->gb);

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

  665.             }

  666.         }

  667. 

  668.         if(s->rct){

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

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

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

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

  673.             }

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

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

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

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

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

  679.             }

  680.         }else{

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

  682.                 ptr[4*mb_x+0] = buffer[mb_x][2];

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

  684.                 ptr[4*mb_x+2] = buffer[mb_x][0];

  685.             }

  686.         }

  687.     }

  688.     return 0;

  689. }

  690. 

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

  692.     int i, mb_x, mb_y;

  693.     const int nb_components=3;

  694. 

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

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

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

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

  699. 

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

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

  702.                     uint8_t *ptr;

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

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

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

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

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

  708.                     x = 0;

  709.                     y = 0;

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

  711. 

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

  713.                         int pred;

  714. 

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

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

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

  718.                                 pred= 128 << point_transform;

  719.                             }else{

  720.                                 pred= ptr[-1];

  721.                             }

  722.                         }else{

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

  724.                                 pred= ptr[-linesize];

  725.                             }else{

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

  727.                             }

  728.                         }

  729. 

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

  731.                             ptr += linesize >> 1;

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

  733. 

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

  735.                             x = 0;

  736.                             y++;

  737.                         }

  738.                     }

  739.                 }

  740.             }else{

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

  742.                     uint8_t *ptr;

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

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

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

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

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

  748.                     x = 0;

  749.                     y = 0;

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

  751. 

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

  753.                         int pred;

  754. 

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

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

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

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

  759.                             x = 0;

  760.                             y++;

  761.                         }

  762.                     }

  763.                 }

  764.             }

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

  766.                 align_get_bits(&s->gb);

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

  768.             }

  769.         }

  770.     }

  771.     return 0;

  772. }

  773. 

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

  775.     int i, mb_x, mb_y;

  776.     uint8_t* data[MAX_COMPONENTS];

  777.     int linesize[MAX_COMPONENTS];

  778. 

  779.     if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {

  780.         av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");

  781.         s->flipped = 0;

  782.     }

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

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

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

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

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

  788.         if(s->flipped) {

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

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

  791.             linesize[c] *= -1;

  792.         }

  793.     }

  794. 

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

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

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

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

  799. 

  800.             if(get_bits_count(&s->gb)>s->gb.size_in_bits){

  801.                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", get_bits_count(&s->gb) - s->gb.size_in_bits);

  802.                 return -1;

  803.             }

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

  805.                 uint8_t *ptr;

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

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

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

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

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

  811.                 x = 0;

  812.                 y = 0;

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

  814.                     ptr = data[c] +

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

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

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

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

  819.                     if(!s->progressive) {

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

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

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

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

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

  825.                             return -1;

  826.                         }

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

  828.                     } else {

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

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

  831.                         if(Ah)

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

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

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

  835.                             return -1;

  836.                         }

  837.                     }

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

  839. //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);

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

  841.                         x = 0;

  842.                         y++;

  843.                     }

  844.                 }

  845.             }

  846. 

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

  848.                 align_get_bits(&s->gb);

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

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

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

  852.             }

  853.         }

  854.     }

  855.     return 0;

  856. }

  857. 

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

  859.     int mb_x, mb_y;

  860.     int EOBRUN = 0;

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

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

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

  864.     int last_scan = 0;

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

  866. 

  867.     if(!Al) {

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

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

  870.     }

  871. 

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

  873.         data += linesize >> 1;

  874. 

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

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

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

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

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

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

  881.             int ret;

  882.             if(Ah)

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

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

  885.             else

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

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

  888.             if(ret < 0) {

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

  890.                 return -1;

  891.             }

  892.             if(last_scan) {

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

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

  895.             }

  896.         }

  897.     }

  898.     return 0;

  899. }

  900. 

  901. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  902. {

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

  904.     int index, id;

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

  906.     int ilv, prev_shift;

  907. 

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

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

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

  911.     if (nb_components == 0 || nb_components > MAX_COMPONENTS){

  912.         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);

  913.         return -1;

  914.     }

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

  916.     {

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

  918.         return -1;

  919.     }

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

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

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

  923.         /* find component index */

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

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

  926.                 break;

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

  928.         {

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

  930.             return -1;

  931.         }

  932.         /* Metasoft MJPEG codec has Cb and Cr swapped */

  933.         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')

  934.             && nb_components == 3 && s->nb_components == 3 && i)

  935.             index = 3 - i;

  936. 

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

  938. 

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

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

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

  942. 

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

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

  945. 

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

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

  948.             goto out_of_range;

  949.         if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)

  950.             goto out_of_range;

  951.     }

  952. 

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

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

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

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

  957. 

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

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

  960. 

  961.     if (nb_components > 1) {

  962.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  973.     }

  974. 

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

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

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

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

  979. 

  980. 

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

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

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

  984. 

  985.     if(s->lossless){

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

  987. //            for(){

  988. //            reset_ls_coding_parameters(s, 0);

  989. 

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

  991.                 return -1;

  992.         }else{

  993.             if(s->rgb){

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

  995.                     return -1;

  996.             }else{

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

  998.                     return -1;

  999.             }

  1000.         }

  1001.     }else{

  1002.         if(s->progressive && predictor) {

  1003.             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)

  1004.                 return -1;

  1005.         } else {

  1006.             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform) < 0)

  1007.                 return -1;

  1008.         }

  1009.     }

  1010.     emms_c();

  1011.     return 0;

  1012.  out_of_range:

  1013.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1014.     return -1;

  1015. }

  1016. 

  1017. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1018. {

  1019.     if (get_bits(&s->gb, 16) != 4)

  1020.         return -1;

  1021.     s->restart_interval = get_bits(&s->gb, 16);

  1022.     s->restart_count = 0;

  1023.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1024. 

  1025.     return 0;

  1026. }

  1027. 

  1028. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1029. {

  1030.     int len, id, i;

  1031. 

  1032.     len = get_bits(&s->gb, 16);

  1033.     if (len < 5)

  1034.         return -1;

  1035.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1036.         return -1;

  1037. 

  1038.     id = get_bits_long(&s->gb, 32);

  1039.     id = av_be2ne32(id);

  1040.     len -= 6;

  1041. 

  1042.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1043.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1044.     }

  1045. 

  1046.     /* buggy AVID, it puts EOI only at every 10th frame */

  1047.     /* also this fourcc is used by non-avid files too, it holds some

  1048.        informations, but it's always present in AVID creates files */

  1049.     if (id == AV_RL32("AVI1"))

  1050.     {

  1051.         /* structure:

  1052.             4bytes      AVI1

  1053.             1bytes      polarity

  1054.             1bytes      always zero

  1055.             4bytes      field_size

  1056.             4bytes      field_size_less_padding

  1057.         */

  1058.             s->buggy_avid = 1;

  1059. //        if (s->first_picture)

  1060. //            printf("mjpeg: workarounding buggy AVID\n");

  1061.         i = get_bits(&s->gb, 8);

  1062.         if     (i==2) s->bottom_field= 1;

  1063.         else if(i==1) s->bottom_field= 0;

  1064. #if 0

  1065.         skip_bits(&s->gb, 8);

  1066.         skip_bits(&s->gb, 32);

  1067.         skip_bits(&s->gb, 32);

  1068.         len -= 10;

  1069. #endif

  1070. //        if (s->interlace_polarity)

  1071. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1072.         goto out;

  1073.     }

  1074. 

  1075. //    len -= 2;

  1076. 

  1077.     if (id == AV_RL32("JFIF"))

  1078.     {

  1079.         int t_w, t_h, v1, v2;

  1080.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1081.         v1= get_bits(&s->gb, 8);

  1082.         v2= get_bits(&s->gb, 8);

  1083.         skip_bits(&s->gb, 8);

  1084. 

  1085.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1086.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1087. 

  1088.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1089.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1090.                 v1, v2,

  1091.                 s->avctx->sample_aspect_ratio.num,

  1092.                 s->avctx->sample_aspect_ratio.den

  1093.             );

  1094. 

  1095.         t_w = get_bits(&s->gb, 8);

  1096.         t_h = get_bits(&s->gb, 8);

  1097.         if (t_w && t_h)

  1098.         {

  1099.             /* skip thumbnail */

  1100.             if (len-10-(t_w*t_h*3) > 0)

  1101.                 len -= t_w*t_h*3;

  1102.         }

  1103.         len -= 10;

  1104.         goto out;

  1105.     }

  1106. 

  1107.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1108.     {

  1109.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1110.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1111.         skip_bits(&s->gb, 16); /* version */

  1112.         skip_bits(&s->gb, 16); /* flags0 */

  1113.         skip_bits(&s->gb, 16); /* flags1 */

  1114.         skip_bits(&s->gb, 8);  /* transform */

  1115.         len -= 7;

  1116.         goto out;

  1117.     }

  1118. 

  1119.     if (id == AV_RL32("LJIF")){

  1120.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1121.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

  1122.         skip_bits(&s->gb, 16); /* version ? */

  1123.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1124.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1125.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1126.         switch( get_bits(&s->gb, 8)){

  1127.         case 1:

  1128.             s->rgb= 1;

  1129.             s->pegasus_rct=0;

  1130.             break;

  1131.         case 2:

  1132.             s->rgb= 1;

  1133.             s->pegasus_rct=1;

  1134.             break;

  1135.         default:

  1136.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1137.         }

  1138.         len -= 9;

  1139.         goto out;

  1140.     }

  1141. 

  1142.     /* Apple MJPEG-A */

  1143.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1144.     {

  1145.         id = get_bits_long(&s->gb, 32);

  1146.         id = av_be2ne32(id);

  1147.         len -= 4;

  1148.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1149.         {

  1150. #if 0

  1151.             skip_bits(&s->gb, 32); /* field size */

  1152.             skip_bits(&s->gb, 32); /* pad field size */

  1153.             skip_bits(&s->gb, 32); /* next off */

  1154.             skip_bits(&s->gb, 32); /* quant off */

  1155.             skip_bits(&s->gb, 32); /* huff off */

  1156.             skip_bits(&s->gb, 32); /* image off */

  1157.             skip_bits(&s->gb, 32); /* scan off */

  1158.             skip_bits(&s->gb, 32); /* data off */

  1159. #endif

  1160.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1161.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1162.         }

  1163.     }

  1164. 

  1165. out:

  1166.     /* slow but needed for extreme adobe jpegs */

  1167.     if (len < 0)

  1168.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1169.     while(--len > 0)

  1170.         skip_bits(&s->gb, 8);

  1171. 

  1172.     return 0;

  1173. }

  1174. 

  1175. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1176. {

  1177.     int len = get_bits(&s->gb, 16);

  1178.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1179.         char *cbuf = av_malloc(len - 1);

  1180.         if (cbuf) {

  1181.             int i;

  1182.             for (i = 0; i < len - 2; i++)

  1183.                 cbuf[i] = get_bits(&s->gb, 8);

  1184.             if (i > 0 && cbuf[i-1] == '\n')

  1185.                 cbuf[i-1] = 0;

  1186.             else

  1187.                 cbuf[i] = 0;

  1188. 

  1189.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1190.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1191. 

  1192.             /* buggy avid, it puts EOI only at every 10th frame */

  1193.             if (!strcmp(cbuf, "AVID"))

  1194.             {

  1195.                 s->buggy_avid = 1;

  1196.                 //        if (s->first_picture)

  1197.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1198.             }

  1199.             else if(!strcmp(cbuf, "CS=ITU601")){

  1200.                 s->cs_itu601= 1;

  1201.             }

  1202.             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||

  1203.                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){

  1204.                 s->flipped = 1;

  1205.             }

  1206. 

  1207.             av_free(cbuf);

  1208.         }

  1209.     }

  1210. 

  1211.     return 0;

  1212. }

  1213. 

  1214. #if 0

  1215. static int valid_marker_list[] =

  1216. {

  1217.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

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

  1219. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1220. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1221. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1222. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1223. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1224. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1225. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1226. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1227. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1228. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1229. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1230. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1231. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1232. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1233. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1234. }

  1235. #endif

  1236. 

  1237. /* return the 8 bit start code value and update the search

  1238.    state. Return -1 if no start code found */

  1239. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1240. {

  1241.     const uint8_t *buf_ptr;

  1242.     unsigned int v, v2;

  1243.     int val;

  1244. #ifdef DEBUG

  1245.     int skipped=0;

  1246. #endif

  1247. 

  1248.     buf_ptr = *pbuf_ptr;

  1249.     while (buf_ptr < buf_end) {

  1250.         v = *buf_ptr++;

  1251.         v2 = *buf_ptr;

  1252.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1253.             val = *buf_ptr++;

  1254.             goto found;

  1255.         }

  1256. #ifdef DEBUG

  1257.         skipped++;

  1258. #endif

  1259.     }

  1260.     val = -1;

  1261. found:

  1262.     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);

  1263.     *pbuf_ptr = buf_ptr;

  1264.     return val;

  1265. }

  1266. 

  1267. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1268.                               void *data, int *data_size,

  1269.                               AVPacket *avpkt)

  1270. {

  1271.     const uint8_t *buf = avpkt->data;

  1272.     int buf_size = avpkt->size;

  1273.     MJpegDecodeContext *s = avctx->priv_data;

  1274.     const uint8_t *buf_end, *buf_ptr;

  1275.     int start_code;

  1276.     AVFrame *picture = data;

  1277. 

  1278.     s->got_picture = 0; // picture from previous image can not be reused

  1279.     buf_ptr = buf;

  1280.     buf_end = buf + buf_size;

  1281.     while (buf_ptr < buf_end) {

  1282.         /* find start next marker */

  1283.         start_code = find_marker(&buf_ptr, buf_end);

  1284.         {

  1285.             /* EOF */

  1286.             if (start_code < 0) {

  1287.                 goto the_end;

  1288.             } else {

  1289.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1290. 

  1291.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1292.                 {

  1293.                     av_free(s->buffer);

  1294.                     s->buffer_size = buf_end-buf_ptr;

  1295.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1296.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1297.                         s->buffer_size);

  1298.                 }

  1299. 

  1300.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1301.                 if (start_code == SOS && !s->ls)

  1302.                 {

  1303.                     const uint8_t *src = buf_ptr;

  1304.                     uint8_t *dst = s->buffer;

  1305. 

  1306.                     while (src<buf_end)

  1307.                     {

  1308.                         uint8_t x = *(src++);

  1309. 

  1310.                         *(dst++) = x;

  1311.                         if (avctx->codec_id != CODEC_ID_THP)

  1312.                         {

  1313.                             if (x == 0xff) {

  1314.                                 while (src < buf_end && x == 0xff)

  1315.                                     x = *(src++);

  1316. 

  1317.                                 if (x >= 0xd0 && x <= 0xd7)

  1318.                                     *(dst++) = x;

  1319.                                 else if (x)

  1320.                                     break;

  1321.                             }

  1322.                         }

  1323.                     }

  1324.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1325. 

  1326.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1327.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1328.                 }

  1329.                 else if(start_code == SOS && s->ls){

  1330.                     const uint8_t *src = buf_ptr;

  1331.                     uint8_t *dst = s->buffer;

  1332.                     int bit_count = 0;

  1333.                     int t = 0, b = 0;

  1334.                     PutBitContext pb;

  1335. 

  1336.                     s->cur_scan++;

  1337. 

  1338.                     /* find marker */

  1339.                     while (src + t < buf_end){

  1340.                         uint8_t x = src[t++];

  1341.                         if (x == 0xff){

  1342.                             while((src + t < buf_end) && x == 0xff)

  1343.                                 x = src[t++];

  1344.                             if (x & 0x80) {

  1345.                                 t -= 2;

  1346.                                 break;

  1347.                             }

  1348.                         }

  1349.                     }

  1350.                     bit_count = t * 8;

  1351. 

  1352.                     init_put_bits(&pb, dst, t);

  1353. 

  1354.                     /* unescape bitstream */

  1355.                     while(b < t){

  1356.                         uint8_t x = src[b++];

  1357.                         put_bits(&pb, 8, x);

  1358.                         if(x == 0xFF){

  1359.                             x = src[b++];

  1360.                             put_bits(&pb, 7, x);

  1361.                             bit_count--;

  1362.                         }

  1363.                     }

  1364.                     flush_put_bits(&pb);

  1365. 

  1366.                     init_get_bits(&s->gb, dst, bit_count);

  1367.                 }

  1368.                 else

  1369.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1370. 

  1371.                 s->start_code = start_code;

  1372.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1373.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1374.                 }

  1375. 

  1376.                 /* process markers */

  1377.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1378.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1379.                     /* APP fields */

  1380.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1381.                     mjpeg_decode_app(s);

  1382.                     /* Comment */

  1383.                 } else if (start_code == COM){

  1384.                     mjpeg_decode_com(s);

  1385.                 }

  1386. 

  1387.                 switch(start_code) {

  1388.                 case SOI:

  1389.                     s->restart_interval = 0;

  1390. 

  1391.                     s->restart_count = 0;

  1392.                     /* nothing to do on SOI */

  1393.                     break;

  1394.                 case DQT:

  1395.                     ff_mjpeg_decode_dqt(s);

  1396.                     break;

  1397.                 case DHT:

  1398.                     if(ff_mjpeg_decode_dht(s) < 0){

  1399.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1400.                         return -1;

  1401.                     }

  1402.                     break;

  1403.                 case SOF0:

  1404.                 case SOF1:

  1405.                     s->lossless=0;

  1406.                     s->ls=0;

  1407.                     s->progressive=0;

  1408.                     if (ff_mjpeg_decode_sof(s) < 0)

  1409.                         return -1;

  1410.                     break;

  1411.                 case SOF2:

  1412.                     s->lossless=0;

  1413.                     s->ls=0;

  1414.                     s->progressive=1;

  1415.                     if (ff_mjpeg_decode_sof(s) < 0)

  1416.                         return -1;

  1417.                     break;

  1418.                 case SOF3:

  1419.                     s->lossless=1;

  1420.                     s->ls=0;

  1421.                     s->progressive=0;

  1422.                     if (ff_mjpeg_decode_sof(s) < 0)

  1423.                         return -1;

  1424.                     break;

  1425.                 case SOF48:

  1426.                     s->lossless=1;

  1427.                     s->ls=1;

  1428.                     s->progressive=0;

  1429.                     if (ff_mjpeg_decode_sof(s) < 0)

  1430.                         return -1;

  1431.                     break;

  1432.                 case LSE:

  1433.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1434.                         return -1;

  1435.                     break;

  1436.                 case EOI:

  1437.                     s->cur_scan = 0;

  1438.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1439.                         break;

  1440. eoi_parser:

  1441.                     if (!s->got_picture) {

  1442.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1443.                         break;

  1444.                     }

  1445.                     {

  1446.                         if (s->interlaced) {

  1447.                             s->bottom_field ^= 1;

  1448.                             /* if not bottom field, do not output image yet */

  1449.                             if (s->bottom_field == !s->interlace_polarity)

  1450.                                 goto not_the_end;

  1451.                         }

  1452.                         *picture = s->picture;

  1453.                         *data_size = sizeof(AVFrame);

  1454. 

  1455.                         if(!s->lossless){

  1456.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1457.                             picture->qstride= 0;

  1458.                             picture->qscale_table= s->qscale_table;

  1459.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1460.                             if(avctx->debug & FF_DEBUG_QP)

  1461.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1462.                             picture->quality*= FF_QP2LAMBDA;

  1463.                         }

  1464. 

  1465.                         goto the_end;

  1466.                     }

  1467.                     break;

  1468.                 case SOS:

  1469.                     if (!s->got_picture) {

  1470.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1471.                         break;

  1472.                     }

  1473.                     ff_mjpeg_decode_sos(s);

  1474.                     /* buggy avid puts EOI every 10-20th frame */

  1475.                     /* if restart period is over process EOI */

  1476.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1477.                         goto eoi_parser;

  1478.                     break;

  1479.                 case DRI:

  1480.                     mjpeg_decode_dri(s);

  1481.                     break;

  1482.                 case SOF5:

  1483.                 case SOF6:

  1484.                 case SOF7:

  1485.                 case SOF9:

  1486.                 case SOF10:

  1487.                 case SOF11:

  1488.                 case SOF13:

  1489.                 case SOF14:

  1490.                 case SOF15:

  1491.                 case JPG:

  1492.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1493.                     break;

  1494. //                default:

  1495. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1496. //                    break;

  1497.                 }

  1498. 

  1499. not_the_end:

  1500.                 /* eof process start code */

  1501.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1502.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1503.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1504.             }

  1505.         }

  1506.     }

  1507.     if (s->got_picture) {

  1508.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1509.         goto eoi_parser;

  1510.     }

  1511.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1512.     return -1;

  1513. the_end:

  1514.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1515. //    return buf_end - buf_ptr;

  1516.     return buf_ptr - buf;

  1517. }

  1518. 

  1519. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1520. {

  1521.     MJpegDecodeContext *s = avctx->priv_data;

  1522.     int i, j;

  1523. 

  1524.     if (s->picture.data[0])

  1525.         avctx->release_buffer(avctx, &s->picture);

  1526. 

  1527.     av_free(s->buffer);

  1528.     av_free(s->qscale_table);

  1529.     av_freep(&s->ljpeg_buffer);

  1530.     s->ljpeg_buffer_size=0;

  1531. 

  1532.     for(i=0;i<3;i++) {

  1533.         for(j=0;j<4;j++)

  1534.             free_vlc(&s->vlcs[i][j]);

  1535.     }

  1536.     for(i=0; i<MAX_COMPONENTS; i++) {

  1537.         av_freep(&s->blocks[i]);

  1538.         av_freep(&s->last_nnz[i]);

  1539.     }

  1540.     return 0;

  1541. }

  1542. 

  1543. AVCodec ff_mjpeg_decoder = {

  1544.     "mjpeg",

  1545.     AVMEDIA_TYPE_VIDEO,

  1546.     CODEC_ID_MJPEG,

  1547.     sizeof(MJpegDecodeContext),

  1548.     ff_mjpeg_decode_init,

  1549.     NULL,

  1550.     ff_mjpeg_decode_end,

  1551.     ff_mjpeg_decode_frame,

  1552.     CODEC_CAP_DR1,

  1553.     NULL,

  1554.     .max_lowres = 3,

  1555.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1556. };

  1557. 

  1558. AVCodec ff_thp_decoder = {

  1559.     "thp",

  1560.     AVMEDIA_TYPE_VIDEO,

  1561.     CODEC_ID_THP,

  1562.     sizeof(MJpegDecodeContext),

  1563.     ff_mjpeg_decode_init,

  1564.     NULL,

  1565.     ff_mjpeg_decode_end,

  1566.     ff_mjpeg_decode_frame,

  1567.     CODEC_CAP_DR1,

  1568.     NULL,

  1569.     .max_lowres = 3,

  1570.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1571. };