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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 "avcodec.h"

  37. #include "dsputil.h"

  38. #include "mjpeg.h"

  39. #include "mjpegdec.h"

  40. #include "jpeglsdec.h"

  41. 

  42. 

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

  44.                       int nb_codes, int use_static, int is_ac)

  45. {

  46.     uint8_t huff_size[256+16];

  47.     uint16_t huff_code[256+16];

  48. 

  49.     assert(nb_codes <= 256);

  50. 

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

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

  53. 

  54.     if(is_ac){

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

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

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

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

  59.         nb_codes += 16;

  60.     }

  61. 

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

  63. }

  64. 

  65. static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {

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

  67.               ff_mjpeg_val_dc, 12, 0, 0);

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

  69.               ff_mjpeg_val_dc, 12, 0, 0);

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

  71.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

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

  73.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

  74. }

  75. 

  76. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  77. {

  78.     MJpegDecodeContext *s = avctx->priv_data;

  79. 

  80.     s->avctx = avctx;

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

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

  83.     s->buffer_size = 0;

  84.     s->buffer = NULL;

  85.     s->start_code = -1;

  86.     s->first_picture = 1;

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

  88.     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;

  89. 

  90.     build_basic_mjpeg_vlc(s);

  91. 

  92.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  93.     {

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

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

  96.         if (ff_mjpeg_decode_dht(s)) {

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

  98.             build_basic_mjpeg_vlc(s);

  99.         }

  100.     }

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

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

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

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

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

  106.         }

  107.     }

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

  109.         s->flipped = 1;

  110. 

  111.     return 0;

  112. }

  113. 

  114. 

  115. /* quantize tables */

  116. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  117. {

  118.     int len, index, i, j;

  119. 

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

  121. 

  122.     while (len >= 65) {

  123.         /* only 8 bit precision handled */

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

  125.         {

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

  127.             return -1;

  128.         }

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

  130.         if (index >= 4)

  131.             return -1;

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

  133.         /* read quant table */

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

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

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

  137.         }

  138. 

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

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

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

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

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

  144.         len -= 65;

  145.     }

  146. 

  147.     return 0;

  148. }

  149. 

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

  151. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  152. {

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

  154.     uint8_t bits_table[17];

  155.     uint8_t val_table[256];

  156. 

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

  158. 

  159.     while (len > 0) {

  160.         if (len < 17)

  161.             return -1;

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

  163.         if (class >= 2)

  164.             return -1;

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

  166.         if (index >= 4)

  167.             return -1;

  168.         n = 0;

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

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

  171.             n += bits_table[i];

  172.         }

  173.         len -= 17;

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

  175.             return -1;

  176. 

  177.         code_max = 0;

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

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

  180.             if (v > code_max)

  181.                 code_max = v;

  182.             val_table[i] = v;

  183.         }

  184.         len -= n;

  185. 

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

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

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

  189.                class, index, code_max + 1);

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

  191.             return -1;

  192.         }

  193.     }

  194.     return 0;

  195. }

  196. 

  197. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  198. {

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

  200. 

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

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

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

  204. 

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

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

  207. 

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

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

  210.         return -1;

  211.     }

  212. 

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

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

  215. 

  216.     //HACK for odd_height.mov

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

  218.         height= s->height;

  219. 

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

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

  222.         return -1;

  223. 

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

  225.     if (nb_components <= 0 ||

  226.         nb_components > MAX_COMPONENTS)

  227.         return -1;

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

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

  230.         return -1;

  231.     }

  232.     s->nb_components = nb_components;

  233.     s->h_max = 1;

  234.     s->v_max = 1;

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

  236.         /* component id */

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

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

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

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

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

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

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

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

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

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

  247.             return -1;

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

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

  250.     }

  251. 

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

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

  254.         return -1;

  255.     }

  256. 

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

  258. 

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

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

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

  262.         av_freep(&s->qscale_table);

  263. 

  264.         s->width = width;

  265.         s->height = height;

  266.         s->interlaced = 0;

  267. 

  268.         /* test interlaced mode */

  269.         if (s->first_picture &&

  270.             s->org_height != 0 &&

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

  272.             s->interlaced = 1;

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

  274.             s->picture.interlaced_frame = 1;

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

  276.             height *= 2;

  277.         }

  278. 

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

  280. 

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

  282. 

  283.         s->first_picture = 0;

  284.     }

  285. 

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

  287.         return 0;

  288. 

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

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

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

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

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

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

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

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

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

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

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

  300. 

  301.     switch(pix_fmt_id){

  302.     case 0x11111100:

  303.         if(s->rgb){

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

  305.         }else

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

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

  308.         break;

  309.     case 0x11000000:

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

  311.         break;

  312.     case 0x12111100:

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

  314.         break;

  315.     case 0x21111100:

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

  317.         break;

  318.     case 0x22111100:

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

  320.         break;

  321.     default:

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

  323.         return -1;

  324.     }

  325.     if(s->ls){

  326.         if(s->nb_components > 1)

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

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

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

  330.         else

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

  332.     }

  333. 

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

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

  336. 

  337.     s->picture.reference= 0;

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

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

  340.         return -1;

  341.     }

  342.     s->picture.pict_type= FF_I_TYPE;

  343.     s->picture.key_frame= 1;

  344.     s->got_picture = 1;

  345. 

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

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

  348.     }

  349. 

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

  351. 

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

  353.     {

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

  355.     }

  356. 

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

  358.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  368.         }

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

  370.     }

  371.     return 0;

  372. }

  373. 

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

  375. {

  376.     int code;

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

  378.     if (code < 0)

  379.     {

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

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

  382.         return 0xffff;

  383.     }

  384. 

  385.     if(code)

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

  387.     else

  388.         return 0;

  389. }

  390. 

  391. /* decode block and dequantize */

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

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

  394. {

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

  396. 

  397.     /* DC coef */

  398.     val = mjpeg_decode_dc(s, dc_index);

  399.     if (val == 0xffff) {

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

  401.         return -1;

  402.     }

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

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

  405.     block[0] = val;

  406.     /* AC coefs */

  407.     i = 0;

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

  409.     for(;;) {

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

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

  412. 

  413.         /* EOB */

  414.         if (code == 0x10)

  415.             break;

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

  417.         if(code != 0x100){

  418.             code &= 0xf;

  419.             if(code > MIN_CACHE_BITS - 16){

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

  421.             }

  422.             {

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

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

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

  426.             }

  427. 

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

  429. 

  430.             if (i >= 63) {

  431.                 if(i == 63){

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

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

  434.                     break;

  435.                 }

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

  437.                 return -1;

  438.             }

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

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

  441.         }

  442.     }

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

  444. 

  445.     return 0;

  446. }

  447. 

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

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

  450. {

  451.     int val;

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

  453.     val = mjpeg_decode_dc(s, dc_index);

  454.     if (val == 0xffff) {

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

  456.         return -1;

  457.     }

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

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

  460.     block[0] = val;

  461.     return 0;

  462. }

  463. 

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

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

  466.                                     int ac_index, int16_t *quant_matrix,

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

  468. {

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

  470. 

  471.     if(*EOBRUN){

  472.         (*EOBRUN)--;

  473.         return 0;

  474.     }

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

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

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

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

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

  480.         code -= 16;

  481.         if(code & 0xF) {

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

  483.             code &= 0xf;

  484.             if(code > MIN_CACHE_BITS - 16){

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

  486.             }

  487.             {

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

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

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

  491.             }

  492. 

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

  494. 

  495.             if (i >= se) {

  496.                 if(i == se){

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

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

  499.                     break;

  500.                 }

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

  502.                 return -1;

  503.             }

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

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

  506.         }else{

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

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

  509.                 i += 15;

  510.             }else{

  511.                 val = run;

  512.                 run = (1 << run);

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

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

  515.                 if(val)

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

  517.                 *EOBRUN = run - 1;

  518.                 break;

  519.             }

  520.         }

  521.     }

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

  523.     if(i > *last_nnz)

  524.         *last_nnz = i;

  525.     return 0;

  526. }

  527. 

  528. #define REFINE_BIT(j) {\

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

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

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

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

  533. }

  534. 

  535. #define ZERO_RUN \

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

  537.     if(i > last) {\

  538.         i += run;\

  539.         if(i > se) {\

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

  541.             return -1;\

  542.         }\

  543.         break;\

  544.     }\

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

  546.     if(block[j])\

  547.         REFINE_BIT(j)\

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

  549.         break;\

  550. }

  551. 

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

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

  554.                         int ac_index, int16_t *quant_matrix,

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

  556. {

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

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

  559. 

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

  561.     if(*EOBRUN)

  562.         (*EOBRUN)--;

  563.     else {

  564.         for(;;i++) {

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

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

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

  568.             code -= 16;

  569.             if(code & 0xF) {

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

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

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

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

  574.                 ZERO_RUN;

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

  576.                 val--;

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

  578.                 if(i == se) {

  579.                     if(i > *last_nnz)

  580.                         *last_nnz = i;

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

  582.                     return 0;

  583.                 }

  584.             }else{

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

  586.                 if(run == 0xF){

  587.                     ZERO_RUN;

  588.                 }else{

  589.                     val = run;

  590.                     run = (1 << run);

  591.                     if(val) {

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

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

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

  595.                     }

  596.                     *EOBRUN = run - 1;

  597.                     break;

  598.                 }

  599.             }

  600.         }

  601. 

  602.         if(i > *last_nnz)

  603.             *last_nnz = i;

  604.     }

  605. 

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

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

  608.         if(block[j])

  609.             REFINE_BIT(j)

  610.     }

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

  612. 

  613.     return 0;

  614. }

  615. #undef REFINE_BIT

  616. #undef ZERO_RUN

  617. 

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

  619.     int i, mb_x, mb_y;

  620.     uint16_t (*buffer)[4];

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

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

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

  624. 

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

  626.     buffer= s->ljpeg_buffer;

  627. 

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

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

  630.     }

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

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

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

  634. 

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

  636.             ptr += linesize >> 1;

  637. 

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

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

  640.         }

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

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

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

  644. 

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

  646.                 int pred;

  647. 

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

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

  650. 

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

  652. 

  653.                 left[i]=

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

  655.             }

  656. 

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

  658.                 align_get_bits(&s->gb);

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

  660.             }

  661.         }

  662. 

  663.         if(s->rct){

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

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

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

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

  668.             }

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

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

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

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

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

  674.             }

  675.         }else{

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

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

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

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

  680.             }

  681.         }

  682.     }

  683.     return 0;

  684. }

  685. 

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

  687.     int i, mb_x, mb_y;

  688.     const int nb_components=3;

  689. 

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

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

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

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

  694. 

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

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

  697.                     uint8_t *ptr;

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

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

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

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

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

  703.                     x = 0;

  704.                     y = 0;

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

  706. 

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

  708.                         int pred;

  709. 

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

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

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

  713.                                 pred= 128 << point_transform;

  714.                             }else{

  715.                                 pred= ptr[-1];

  716.                             }

  717.                         }else{

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

  719.                                 pred= ptr[-linesize];

  720.                             }else{

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

  722.                             }

  723.                         }

  724. 

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

  726.                             ptr += linesize >> 1;

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

  728. 

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

  730.                             x = 0;

  731.                             y++;

  732.                         }

  733.                     }

  734.                 }

  735.             }else{

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

  737.                     uint8_t *ptr;

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

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

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

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

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

  743.                     x = 0;

  744.                     y = 0;

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

  746. 

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

  748.                         int pred;

  749. 

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

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

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

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

  754.                             x = 0;

  755.                             y++;

  756.                         }

  757.                     }

  758.                 }

  759.             }

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

  761.                 align_get_bits(&s->gb);

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

  763.             }

  764.         }

  765.     }

  766.     return 0;

  767. }

  768. 

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

  770.     int i, mb_x, mb_y;

  771.     uint8_t* data[MAX_COMPONENTS];

  772.     int linesize[MAX_COMPONENTS];

  773. 

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

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

  776.         s->flipped = 0;

  777.     }

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

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

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

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

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

  783.         if(s->flipped) {

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

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

  786.             linesize[c] *= -1;

  787.         }

  788.     }

  789. 

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

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

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

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

  794. 

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

  796.                 uint8_t *ptr;

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

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

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

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

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

  802.                 x = 0;

  803.                 y = 0;

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

  805.                     ptr = data[c] +

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

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

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

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

  810.                     if(!s->progressive) {

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

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

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

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

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

  816.                             return -1;

  817.                         }

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

  819.                     } else {

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

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

  822.                         if(Ah)

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

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

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

  826.                             return -1;

  827.                         }

  828.                     }

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

  830. //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);

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

  832.                         x = 0;

  833.                         y++;

  834.                     }

  835.                 }

  836.             }

  837. 

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

  839.                 align_get_bits(&s->gb);

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

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

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

  843.             }

  844.         }

  845.     }

  846.     return 0;

  847. }

  848. 

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

  850.     int mb_x, mb_y;

  851.     int EOBRUN = 0;

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

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

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

  855.     int last_scan = 0;

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

  857. 

  858.     if(!Al) {

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

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

  861.     }

  862. 

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

  864.         data += linesize >> 1;

  865. 

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

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

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

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

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

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

  872.             int ret;

  873.             if(Ah)

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

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

  876.             else

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

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

  879.             if(ret < 0) {

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

  881.                 return -1;

  882.             }

  883.             if(last_scan) {

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

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

  886.             }

  887.         }

  888.     }

  889.     return 0;

  890. }

  891. 

  892. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  893. {

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

  895.     int index, id;

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

  897.     int ilv, prev_shift;

  898. 

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

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

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

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

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

  904.         return -1;

  905.     }

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

  907.     {

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

  909.         return -1;

  910.     }

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

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

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

  914.         /* find component index */

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

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

  917.                 break;

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

  919.         {

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

  921.             return -1;

  922.         }

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

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

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

  926.             index = 3 - i;

  927. 

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

  929. 

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

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

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

  933. 

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

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

  936. 

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

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

  939.             goto out_of_range;

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

  941.             goto out_of_range;

  942.     }

  943. 

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

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

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

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

  948. 

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

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

  951. 

  952.     if (nb_components > 1) {

  953.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  964.     }

  965. 

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

  967.         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" : "",

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

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

  970. 

  971. 

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

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

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

  975. 

  976.     if(s->lossless){

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

  978. //            for(){

  979. //            reset_ls_coding_parameters(s, 0);

  980. 

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

  982.                 return -1;

  983.         }else{

  984.             if(s->rgb){

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

  986.                     return -1;

  987.             }else{

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

  989.                     return -1;

  990.             }

  991.         }

  992.     }else{

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

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

  995.                 return -1;

  996.         } else {

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

  998.                 return -1;

  999.         }

  1000.     }

  1001.     emms_c();

  1002.     return 0;

  1003.  out_of_range:

  1004.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1005.     return -1;

  1006. }

  1007. 

  1008. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1009. {

  1010.     if (get_bits(&s->gb, 16) != 4)

  1011.         return -1;

  1012.     s->restart_interval = get_bits(&s->gb, 16);

  1013.     s->restart_count = 0;

  1014.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1015. 

  1016.     return 0;

  1017. }

  1018. 

  1019. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1020. {

  1021.     int len, id, i;

  1022. 

  1023.     len = get_bits(&s->gb, 16);

  1024.     if (len < 5)

  1025.         return -1;

  1026.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1027.         return -1;

  1028. 

  1029.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1030.     id = be2me_32(id);

  1031.     len -= 6;

  1032. 

  1033.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1034.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1035.     }

  1036. 

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

  1038.     /* also this fourcc is used by non-avid files too, it holds some

  1039.        informations, but it's always present in AVID creates files */

  1040.     if (id == AV_RL32("AVI1"))

  1041.     {

  1042.         /* structure:

  1043.             4bytes      AVI1

  1044.             1bytes      polarity

  1045.             1bytes      always zero

  1046.             4bytes      field_size

  1047.             4bytes      field_size_less_padding

  1048.         */

  1049.             s->buggy_avid = 1;

  1050. //        if (s->first_picture)

  1051. //            printf("mjpeg: workarounding buggy AVID\n");

  1052.         i = get_bits(&s->gb, 8);

  1053.         if     (i==2) s->bottom_field= 1;

  1054.         else if(i==1) s->bottom_field= 0;

  1055. #if 0

  1056.         skip_bits(&s->gb, 8);

  1057.         skip_bits(&s->gb, 32);

  1058.         skip_bits(&s->gb, 32);

  1059.         len -= 10;

  1060. #endif

  1061. //        if (s->interlace_polarity)

  1062. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1063.         goto out;

  1064.     }

  1065. 

  1066. //    len -= 2;

  1067. 

  1068.     if (id == AV_RL32("JFIF"))

  1069.     {

  1070.         int t_w, t_h, v1, v2;

  1071.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1072.         v1= get_bits(&s->gb, 8);

  1073.         v2= get_bits(&s->gb, 8);

  1074.         skip_bits(&s->gb, 8);

  1075. 

  1076.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1077.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1078. 

  1079.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1080.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1081.                 v1, v2,

  1082.                 s->avctx->sample_aspect_ratio.num,

  1083.                 s->avctx->sample_aspect_ratio.den

  1084.             );

  1085. 

  1086.         t_w = get_bits(&s->gb, 8);

  1087.         t_h = get_bits(&s->gb, 8);

  1088.         if (t_w && t_h)

  1089.         {

  1090.             /* skip thumbnail */

  1091.             if (len-10-(t_w*t_h*3) > 0)

  1092.                 len -= t_w*t_h*3;

  1093.         }

  1094.         len -= 10;

  1095.         goto out;

  1096.     }

  1097. 

  1098.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1099.     {

  1100.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1101.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1102.         skip_bits(&s->gb, 16); /* version */

  1103.         skip_bits(&s->gb, 16); /* flags0 */

  1104.         skip_bits(&s->gb, 16); /* flags1 */

  1105.         skip_bits(&s->gb, 8);  /* transform */

  1106.         len -= 7;

  1107.         goto out;

  1108.     }

  1109. 

  1110.     if (id == AV_RL32("LJIF")){

  1111.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1112.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

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

  1114.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1115.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1116.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1117.         switch( get_bits(&s->gb, 8)){

  1118.         case 1:

  1119.             s->rgb= 1;

  1120.             s->pegasus_rct=0;

  1121.             break;

  1122.         case 2:

  1123.             s->rgb= 1;

  1124.             s->pegasus_rct=1;

  1125.             break;

  1126.         default:

  1127.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1128.         }

  1129.         len -= 9;

  1130.         goto out;

  1131.     }

  1132. 

  1133.     /* Apple MJPEG-A */

  1134.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1135.     {

  1136.         id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1137.         id = be2me_32(id);

  1138.         len -= 4;

  1139.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1140.         {

  1141. #if 0

  1142.             skip_bits(&s->gb, 32); /* field size */

  1143.             skip_bits(&s->gb, 32); /* pad field size */

  1144.             skip_bits(&s->gb, 32); /* next off */

  1145.             skip_bits(&s->gb, 32); /* quant off */

  1146.             skip_bits(&s->gb, 32); /* huff off */

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

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

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

  1150. #endif

  1151.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1152.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1153.         }

  1154.     }

  1155. 

  1156. out:

  1157.     /* slow but needed for extreme adobe jpegs */

  1158.     if (len < 0)

  1159.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1160.     while(--len > 0)

  1161.         skip_bits(&s->gb, 8);

  1162. 

  1163.     return 0;

  1164. }

  1165. 

  1166. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1167. {

  1168.     int len = get_bits(&s->gb, 16);

  1169.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1170.         char *cbuf = av_malloc(len - 1);

  1171.         if (cbuf) {

  1172.             int i;

  1173.             for (i = 0; i < len - 2; i++)

  1174.                 cbuf[i] = get_bits(&s->gb, 8);

  1175.             if (i > 0 && cbuf[i-1] == '\n')

  1176.                 cbuf[i-1] = 0;

  1177.             else

  1178.                 cbuf[i] = 0;

  1179. 

  1180.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1181.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1182. 

  1183.             /* buggy avid, it puts EOI only at every 10th frame */

  1184.             if (!strcmp(cbuf, "AVID"))

  1185.             {

  1186.                 s->buggy_avid = 1;

  1187.                 //        if (s->first_picture)

  1188.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1189.             }

  1190.             else if(!strcmp(cbuf, "CS=ITU601")){

  1191.                 s->cs_itu601= 1;

  1192.             }

  1193.             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||

  1194.                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){

  1195.                 s->flipped = 1;

  1196.             }

  1197. 

  1198.             av_free(cbuf);

  1199.         }

  1200.     }

  1201. 

  1202.     return 0;

  1203. }

  1204. 

  1205. #if 0

  1206. static int valid_marker_list[] =

  1207. {

  1208.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

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

  1210. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1211. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1212. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1213. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1214. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1215. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1216. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1217. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1218. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1219. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1220. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1221. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1222. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1223. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1224. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1225. }

  1226. #endif

  1227. 

  1228. /* return the 8 bit start code value and update the search

  1229.    state. Return -1 if no start code found */

  1230. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1231. {

  1232.     const uint8_t *buf_ptr;

  1233.     unsigned int v, v2;

  1234.     int val;

  1235. #ifdef DEBUG

  1236.     int skipped=0;

  1237. #endif

  1238. 

  1239.     buf_ptr = *pbuf_ptr;

  1240.     while (buf_ptr < buf_end) {

  1241.         v = *buf_ptr++;

  1242.         v2 = *buf_ptr;

  1243.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1244.             val = *buf_ptr++;

  1245.             goto found;

  1246.         }

  1247. #ifdef DEBUG

  1248.         skipped++;

  1249. #endif

  1250.     }

  1251.     val = -1;

  1252. found:

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

  1254.     *pbuf_ptr = buf_ptr;

  1255.     return val;

  1256. }

  1257. 

  1258. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1259.                               void *data, int *data_size,

  1260.                               AVPacket *avpkt)

  1261. {

  1262.     const uint8_t *buf = avpkt->data;

  1263.     int buf_size = avpkt->size;

  1264.     MJpegDecodeContext *s = avctx->priv_data;

  1265.     const uint8_t *buf_end, *buf_ptr;

  1266.     int start_code;

  1267.     AVFrame *picture = data;

  1268. 

  1269.     s->got_picture = 0; // picture from previous image can not be reused

  1270.     buf_ptr = buf;

  1271.     buf_end = buf + buf_size;

  1272.     while (buf_ptr < buf_end) {

  1273.         /* find start next marker */

  1274.         start_code = find_marker(&buf_ptr, buf_end);

  1275.         {

  1276.             /* EOF */

  1277.             if (start_code < 0) {

  1278.                 goto the_end;

  1279.             } else {

  1280.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1281. 

  1282.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1283.                 {

  1284.                     av_free(s->buffer);

  1285.                     s->buffer_size = buf_end-buf_ptr;

  1286.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1287.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1288.                         s->buffer_size);

  1289.                 }

  1290. 

  1291.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1292.                 if (start_code == SOS && !s->ls)

  1293.                 {

  1294.                     const uint8_t *src = buf_ptr;

  1295.                     uint8_t *dst = s->buffer;

  1296. 

  1297.                     while (src<buf_end)

  1298.                     {

  1299.                         uint8_t x = *(src++);

  1300. 

  1301.                         *(dst++) = x;

  1302.                         if (avctx->codec_id != CODEC_ID_THP)

  1303.                         {

  1304.                             if (x == 0xff) {

  1305.                                 while (src < buf_end && x == 0xff)

  1306.                                     x = *(src++);

  1307. 

  1308.                                 if (x >= 0xd0 && x <= 0xd7)

  1309.                                     *(dst++) = x;

  1310.                                 else if (x)

  1311.                                     break;

  1312.                             }

  1313.                         }

  1314.                     }

  1315.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1316. 

  1317.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1318.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1319.                 }

  1320.                 else if(start_code == SOS && s->ls){

  1321.                     const uint8_t *src = buf_ptr;

  1322.                     uint8_t *dst = s->buffer;

  1323.                     int bit_count = 0;

  1324.                     int t = 0, b = 0;

  1325.                     PutBitContext pb;

  1326. 

  1327.                     s->cur_scan++;

  1328. 

  1329.                     /* find marker */

  1330.                     while (src + t < buf_end){

  1331.                         uint8_t x = src[t++];

  1332.                         if (x == 0xff){

  1333.                             while((src + t < buf_end) && x == 0xff)

  1334.                                 x = src[t++];

  1335.                             if (x & 0x80) {

  1336.                                 t -= 2;

  1337.                                 break;

  1338.                             }

  1339.                         }

  1340.                     }

  1341.                     bit_count = t * 8;

  1342. 

  1343.                     init_put_bits(&pb, dst, t);

  1344. 

  1345.                     /* unescape bitstream */

  1346.                     while(b < t){

  1347.                         uint8_t x = src[b++];

  1348.                         put_bits(&pb, 8, x);

  1349.                         if(x == 0xFF){

  1350.                             x = src[b++];

  1351.                             put_bits(&pb, 7, x);

  1352.                             bit_count--;

  1353.                         }

  1354.                     }

  1355.                     flush_put_bits(&pb);

  1356. 

  1357.                     init_get_bits(&s->gb, dst, bit_count);

  1358.                 }

  1359.                 else

  1360.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1361. 

  1362.                 s->start_code = start_code;

  1363.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1364.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1365.                 }

  1366. 

  1367.                 /* process markers */

  1368.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1369.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1370.                     /* APP fields */

  1371.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1372.                     mjpeg_decode_app(s);

  1373.                     /* Comment */

  1374.                 } else if (start_code == COM){

  1375.                     mjpeg_decode_com(s);

  1376.                 }

  1377. 

  1378.                 switch(start_code) {

  1379.                 case SOI:

  1380.                     s->restart_interval = 0;

  1381. 

  1382.                     s->restart_count = 0;

  1383.                     /* nothing to do on SOI */

  1384.                     break;

  1385.                 case DQT:

  1386.                     ff_mjpeg_decode_dqt(s);

  1387.                     break;

  1388.                 case DHT:

  1389.                     if(ff_mjpeg_decode_dht(s) < 0){

  1390.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1391.                         return -1;

  1392.                     }

  1393.                     break;

  1394.                 case SOF0:

  1395.                 case SOF1:

  1396.                     s->lossless=0;

  1397.                     s->ls=0;

  1398.                     s->progressive=0;

  1399.                     if (ff_mjpeg_decode_sof(s) < 0)

  1400.                         return -1;

  1401.                     break;

  1402.                 case SOF2:

  1403.                     s->lossless=0;

  1404.                     s->ls=0;

  1405.                     s->progressive=1;

  1406.                     if (ff_mjpeg_decode_sof(s) < 0)

  1407.                         return -1;

  1408.                     break;

  1409.                 case SOF3:

  1410.                     s->lossless=1;

  1411.                     s->ls=0;

  1412.                     s->progressive=0;

  1413.                     if (ff_mjpeg_decode_sof(s) < 0)

  1414.                         return -1;

  1415.                     break;

  1416.                 case SOF48:

  1417.                     s->lossless=1;

  1418.                     s->ls=1;

  1419.                     s->progressive=0;

  1420.                     if (ff_mjpeg_decode_sof(s) < 0)

  1421.                         return -1;

  1422.                     break;

  1423.                 case LSE:

  1424.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1425.                         return -1;

  1426.                     break;

  1427.                 case EOI:

  1428.                     s->cur_scan = 0;

  1429.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1430.                         break;

  1431. eoi_parser:

  1432.                     if (!s->got_picture) {

  1433.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1434.                         break;

  1435.                     }

  1436.                     {

  1437.                         if (s->interlaced) {

  1438.                             s->bottom_field ^= 1;

  1439.                             /* if not bottom field, do not output image yet */

  1440.                             if (s->bottom_field == !s->interlace_polarity)

  1441.                                 goto not_the_end;

  1442.                         }

  1443.                         *picture = s->picture;

  1444.                         *data_size = sizeof(AVFrame);

  1445. 

  1446.                         if(!s->lossless){

  1447.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1448.                             picture->qstride= 0;

  1449.                             picture->qscale_table= s->qscale_table;

  1450.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1451.                             if(avctx->debug & FF_DEBUG_QP)

  1452.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1453.                             picture->quality*= FF_QP2LAMBDA;

  1454.                         }

  1455. 

  1456.                         goto the_end;

  1457.                     }

  1458.                     break;

  1459.                 case SOS:

  1460.                     if (!s->got_picture) {

  1461.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1462.                         break;

  1463.                     }

  1464.                     ff_mjpeg_decode_sos(s);

  1465.                     /* buggy avid puts EOI every 10-20th frame */

  1466.                     /* if restart period is over process EOI */

  1467.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1468.                         goto eoi_parser;

  1469.                     break;

  1470.                 case DRI:

  1471.                     mjpeg_decode_dri(s);

  1472.                     break;

  1473.                 case SOF5:

  1474.                 case SOF6:

  1475.                 case SOF7:

  1476.                 case SOF9:

  1477.                 case SOF10:

  1478.                 case SOF11:

  1479.                 case SOF13:

  1480.                 case SOF14:

  1481.                 case SOF15:

  1482.                 case JPG:

  1483.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1484.                     break;

  1485. //                default:

  1486. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1487. //                    break;

  1488.                 }

  1489. 

  1490. not_the_end:

  1491.                 /* eof process start code */

  1492.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1493.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1494.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1495.             }

  1496.         }

  1497.     }

  1498.     if (s->got_picture) {

  1499.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1500.         goto eoi_parser;

  1501.     }

  1502.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1503.     return -1;

  1504. the_end:

  1505.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1506. //    return buf_end - buf_ptr;

  1507.     return buf_ptr - buf;

  1508. }

  1509. 

  1510. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1511. {

  1512.     MJpegDecodeContext *s = avctx->priv_data;

  1513.     int i, j;

  1514. 

  1515.     if (s->picture.data[0])

  1516.         avctx->release_buffer(avctx, &s->picture);

  1517. 

  1518.     av_free(s->buffer);

  1519.     av_free(s->qscale_table);

  1520.     av_freep(&s->ljpeg_buffer);

  1521.     s->ljpeg_buffer_size=0;

  1522. 

  1523.     for(i=0;i<2;i++) {

  1524.         for(j=0;j<4;j++)

  1525.             free_vlc(&s->vlcs[i][j]);

  1526.     }

  1527.     for(i=0; i<MAX_COMPONENTS; i++) {

  1528.         av_freep(&s->blocks[i]);

  1529.         av_freep(&s->last_nnz[i]);

  1530.     }

  1531.     return 0;

  1532. }

  1533. 

  1534. AVCodec mjpeg_decoder = {

  1535.     "mjpeg",

  1536.     AVMEDIA_TYPE_VIDEO,

  1537.     CODEC_ID_MJPEG,

  1538.     sizeof(MJpegDecodeContext),

  1539.     ff_mjpeg_decode_init,

  1540.     NULL,

  1541.     ff_mjpeg_decode_end,

  1542.     ff_mjpeg_decode_frame,

  1543.     CODEC_CAP_DR1,

  1544.     NULL,

  1545.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1546. };

  1547. 

  1548. AVCodec thp_decoder = {

  1549.     "thp",

  1550.     AVMEDIA_TYPE_VIDEO,

  1551.     CODEC_ID_THP,

  1552.     sizeof(MJpegDecodeContext),

  1553.     ff_mjpeg_decode_init,

  1554.     NULL,

  1555.     ff_mjpeg_decode_end,

  1556.     ff_mjpeg_decode_frame,

  1557.     CODEC_CAP_DR1,

  1558.     NULL,

  1559.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1560. };