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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 libavcodec/mjpegdec.c

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "avcodec.h"

  37. #include "dsputil.h"

  38. #include "mjpeg.h"

  39. #include "mjpegdec.h"

  40. #include "jpeglsdec.h"

  41. 

  42. 

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

  44.                       int nb_codes, int use_static, int is_ac)

  45. {

  46.     uint8_t huff_size[256+16];

  47.     uint16_t huff_code[256+16];

  48. 

  49.     assert(nb_codes <= 256);

  50. 

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

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

  53. 

  54.     if(is_ac){

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

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

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

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

  59.         nb_codes += 16;

  60.     }

  61. 

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

  63. }

  64. 

  65. static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {

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

  67.               ff_mjpeg_val_dc, 12, 0, 0);

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

  69.               ff_mjpeg_val_dc, 12, 0, 0);

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

  71.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

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

  73.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

  74. }

  75. 

  76. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  77. {

  78.     MJpegDecodeContext *s = avctx->priv_data;

  79. 

  80.     s->avctx = avctx;

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

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

  83.     s->buffer_size = 0;

  84.     s->buffer = NULL;

  85.     s->start_code = -1;

  86.     s->first_picture = 1;

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

  88.     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. 

  109.     return 0;

  110. }

  111. 

  112. 

  113. /* quantize tables */

  114. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  115. {

  116.     int len, index, i, j;

  117. 

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

  119. 

  120.     while (len >= 65) {

  121.         /* only 8 bit precision handled */

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

  123.         {

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

  125.             return -1;

  126.         }

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

  128.         if (index >= 4)

  129.             return -1;

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

  131.         /* read quant table */

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

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

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

  135.         }

  136. 

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

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

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

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

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

  142.         len -= 65;

  143.     }

  144. 

  145.     return 0;

  146. }

  147. 

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

  149. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  150. {

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

  152.     uint8_t bits_table[17];

  153.     uint8_t val_table[256];

  154. 

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

  156. 

  157.     while (len > 0) {

  158.         if (len < 17)

  159.             return -1;

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

  161.         if (class >= 2)

  162.             return -1;

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

  164.         if (index >= 4)

  165.             return -1;

  166.         n = 0;

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

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

  169.             n += bits_table[i];

  170.         }

  171.         len -= 17;

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

  173.             return -1;

  174. 

  175.         code_max = 0;

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

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

  178.             if (v > code_max)

  179.                 code_max = v;

  180.             val_table[i] = v;

  181.         }

  182.         len -= n;

  183. 

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

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

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

  187.                class, index, code_max + 1);

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

  189.             return -1;

  190.         }

  191.     }

  192.     return 0;

  193. }

  194. 

  195. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  196. {

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

  198. 

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

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

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

  202. 

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

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

  205. 

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

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

  208.         return -1;

  209.     }

  210. 

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

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

  213. 

  214.     //HACK for odd_height.mov

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

  216.         height= s->height;

  217. 

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

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

  220.         return -1;

  221. 

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

  223.     if (nb_components <= 0 ||

  224.         nb_components > MAX_COMPONENTS)

  225.         return -1;

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

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

  228.         return -1;

  229.     }

  230.     s->nb_components = nb_components;

  231.     s->h_max = 1;

  232.     s->v_max = 1;

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

  234.         /* component id */

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

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

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

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

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

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

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

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

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

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

  245.             return -1;

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

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

  248.     }

  249. 

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

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

  252.         return -1;

  253.     }

  254. 

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

  256. 

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

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

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

  260.         av_freep(&s->qscale_table);

  261. 

  262.         s->width = width;

  263.         s->height = height;

  264.         s->interlaced = 0;

  265. 

  266.         /* test interlaced mode */

  267.         if (s->first_picture &&

  268.             s->org_height != 0 &&

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

  270.             s->interlaced = 1;

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

  272.             s->picture.interlaced_frame = 1;

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

  274.             height *= 2;

  275.         }

  276. 

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

  278. 

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

  280. 

  281.         s->first_picture = 0;

  282.     }

  283. 

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

  285.         return 0;

  286. 

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

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

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

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

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

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

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

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

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

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

  297. 

  298.     switch(pix_fmt_id){

  299.     case 0x11111100:

  300.         if(s->rgb){

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

  302.         }else

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

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

  305.         break;

  306.     case 0x11000000:

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

  308.         break;

  309.     case 0x12111100:

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

  311.         break;

  312.     case 0x21111100:

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

  314.         break;

  315.     case 0x22111100:

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

  317.         break;

  318.     default:

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

  320.         return -1;

  321.     }

  322.     if(s->ls){

  323.         if(s->nb_components > 1)

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

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

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

  327.         else

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

  329.     }

  330. 

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

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

  333. 

  334.     s->picture.reference= 0;

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

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

  337.         return -1;

  338.     }

  339.     s->picture.pict_type= FF_I_TYPE;

  340.     s->picture.key_frame= 1;

  341.     s->got_picture = 1;

  342. 

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

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

  345.     }

  346. 

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

  348. 

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

  350.     {

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

  352.     }

  353. 

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

  355.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  365.         }

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

  367.     }

  368.     return 0;

  369. }

  370. 

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

  372. {

  373.     int code;

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

  375.     if (code < 0)

  376.     {

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

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

  379.         return 0xffff;

  380.     }

  381. 

  382.     if(code)

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

  384.     else

  385.         return 0;

  386. }

  387. 

  388. /* decode block and dequantize */

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

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

  391. {

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

  393. 

  394.     /* DC coef */

  395.     val = mjpeg_decode_dc(s, dc_index);

  396.     if (val == 0xffff) {

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

  398.         return -1;

  399.     }

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

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

  402.     block[0] = val;

  403.     /* AC coefs */

  404.     i = 0;

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

  406.     for(;;) {

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

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

  409. 

  410.         /* EOB */

  411.         if (code == 0x10)

  412.             break;

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

  414.         if(code != 0x100){

  415.             code &= 0xf;

  416.             if(code > MIN_CACHE_BITS - 16){

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

  418.             }

  419.             {

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

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

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

  423.             }

  424. 

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

  426. 

  427.             if (i >= 63) {

  428.                 if(i == 63){

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

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

  431.                     break;

  432.                 }

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

  434.                 return -1;

  435.             }

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

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

  438.         }

  439.     }

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

  441. 

  442.     return 0;

  443. }

  444. 

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

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

  447. {

  448.     int val;

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

  450.     val = mjpeg_decode_dc(s, dc_index);

  451.     if (val == 0xffff) {

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

  453.         return -1;

  454.     }

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

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

  457.     block[0] = val;

  458.     return 0;

  459. }

  460. 

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

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

  463.                                     int ac_index, int16_t *quant_matrix,

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

  465. {

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

  467. 

  468.     if(*EOBRUN){

  469.         (*EOBRUN)--;

  470.         return 0;

  471.     }

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

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

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

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

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

  477.         code -= 16;

  478.         if(code & 0xF) {

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

  480.             code &= 0xf;

  481.             if(code > MIN_CACHE_BITS - 16){

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

  483.             }

  484.             {

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

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

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

  488.             }

  489. 

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

  491. 

  492.             if (i >= se) {

  493.                 if(i == se){

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

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

  496.                     break;

  497.                 }

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

  499.                 return -1;

  500.             }

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

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

  503.         }else{

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

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

  506.                 i += 15;

  507.             }else{

  508.                 val = run;

  509.                 run = (1 << run);

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

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

  512.                 if(val)

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

  514.                 *EOBRUN = run - 1;

  515.                 break;

  516.             }

  517.         }

  518.     }

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

  520.     if(i > *last_nnz)

  521.         *last_nnz = i;

  522.     return 0;

  523. }

  524. 

  525. #define REFINE_BIT(j) {\

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

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

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

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

  530. }

  531. 

  532. #define ZERO_RUN \

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

  534.     if(i > last) {\

  535.         i += run;\

  536.         if(i > se) {\

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

  538.             return -1;\

  539.         }\

  540.         break;\

  541.     }\

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

  543.     if(block[j])\

  544.         REFINE_BIT(j)\

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

  546.         break;\

  547. }

  548. 

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

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

  551.                         int ac_index, int16_t *quant_matrix,

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

  553. {

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

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

  556. 

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

  558.     if(*EOBRUN)

  559.         (*EOBRUN)--;

  560.     else {

  561.         for(;;i++) {

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

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

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

  565.             code -= 16;

  566.             if(code & 0xF) {

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

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

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

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

  571.                 ZERO_RUN;

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

  573.                 val--;

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

  575.                 if(i == se) {

  576.                     if(i > *last_nnz)

  577.                         *last_nnz = i;

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

  579.                     return 0;

  580.                 }

  581.             }else{

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

  583.                 if(run == 0xF){

  584.                     ZERO_RUN;

  585.                 }else{

  586.                     val = run;

  587.                     run = (1 << run);

  588.                     if(val) {

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

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

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

  592.                     }

  593.                     *EOBRUN = run - 1;

  594.                     break;

  595.                 }

  596.             }

  597.         }

  598. 

  599.         if(i > *last_nnz)

  600.             *last_nnz = i;

  601.     }

  602. 

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

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

  605.         if(block[j])

  606.             REFINE_BIT(j)

  607.     }

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

  609. 

  610.     return 0;

  611. }

  612. #undef REFINE_BIT

  613. #undef ZERO_RUN

  614. 

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

  616.     int i, mb_x, mb_y;

  617.     uint16_t buffer[32768][4];

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

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

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

  621. 

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

  623.         return -1;

  624. 

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

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

  627.     }

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

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

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

  631. 

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

  633.             ptr += linesize >> 1;

  634. 

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

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

  637.         }

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

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

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

  641. 

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

  643.                 int pred;

  644. 

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

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

  647. 

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

  649. 

  650.                 left[i]=

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

  652.             }

  653. 

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

  655.                 align_get_bits(&s->gb);

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

  657.             }

  658.         }

  659. 

  660.         if(s->rct){

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

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

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

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

  665.             }

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

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

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

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

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

  671.             }

  672.         }else{

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

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

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

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

  677.             }

  678.         }

  679.     }

  680.     return 0;

  681. }

  682. 

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

  684.     int i, mb_x, mb_y;

  685.     const int nb_components=3;

  686. 

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

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

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

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

  691. 

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

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

  694.                     uint8_t *ptr;

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

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

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

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

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

  700.                     x = 0;

  701.                     y = 0;

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

  703. 

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

  705.                         int pred;

  706. 

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

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

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

  710.                                 pred= 128 << point_transform;

  711.                             }else{

  712.                                 pred= ptr[-1];

  713.                             }

  714.                         }else{

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

  716.                                 pred= ptr[-linesize];

  717.                             }else{

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

  719.                             }

  720.                         }

  721. 

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

  723.                             ptr += linesize >> 1;

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

  725. 

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

  727.                             x = 0;

  728.                             y++;

  729.                         }

  730.                     }

  731.                 }

  732.             }else{

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

  734.                     uint8_t *ptr;

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

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

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

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

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

  740.                     x = 0;

  741.                     y = 0;

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

  743. 

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

  745.                         int pred;

  746. 

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

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

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

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

  751.                             x = 0;

  752.                             y++;

  753.                         }

  754.                     }

  755.                 }

  756.             }

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

  758.                 align_get_bits(&s->gb);

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

  760.             }

  761.         }

  762.     }

  763.     return 0;

  764. }

  765. 

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

  767.     int i, mb_x, mb_y;

  768.     uint8_t* data[MAX_COMPONENTS];

  769.     int linesize[MAX_COMPONENTS];

  770. 

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

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

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

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

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

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

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

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

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

  780.             linesize[c] *= -1;

  781.         }

  782.     }

  783. 

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

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

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

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

  788. 

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

  790.                 uint8_t *ptr;

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

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

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

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

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

  796.                 x = 0;

  797.                 y = 0;

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

  799.                     ptr = data[c] +

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

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

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

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

  804.                     if(!s->progressive) {

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

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

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

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

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

  810.                             return -1;

  811.                         }

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

  813.                     } else {

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

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

  816.                         if(Ah)

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

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

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

  820.                             return -1;

  821.                         }

  822.                     }

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

  824. //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);

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

  826.                         x = 0;

  827.                         y++;

  828.                     }

  829.                 }

  830.             }

  831. 

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

  833.                 align_get_bits(&s->gb);

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

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

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

  837.             }

  838.         }

  839.     }

  840.     return 0;

  841. }

  842. 

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

  844.     int mb_x, mb_y;

  845.     int EOBRUN = 0;

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

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

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

  849.     int last_scan = 0;

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

  851. 

  852.     if(!Al) {

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

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

  855.     }

  856. 

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

  858.         data += linesize >> 1;

  859. 

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

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

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

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

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

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

  866.             int ret;

  867.             if(Ah)

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

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

  870.             else

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

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

  873.             if(ret < 0) {

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

  875.                 return -1;

  876.             }

  877.             if(last_scan) {

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

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

  880.             }

  881.         }

  882.     }

  883.     return 0;

  884. }

  885. 

  886. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  887. {

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

  889.     int index, id;

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

  891.     int ilv, prev_shift;

  892. 

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

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

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

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

  897.     {

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

  899.         return -1;

  900.     }

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

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

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

  904.         /* find component index */

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

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

  907.                 break;

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

  909.         {

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

  911.             return -1;

  912.         }

  913. 

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

  915. 

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

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

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

  919. 

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

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

  922. 

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

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

  925.             goto out_of_range;

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

  927.             goto out_of_range;

  928.     }

  929. 

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

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

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

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

  934. 

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

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

  937. 

  938.     if (nb_components > 1) {

  939.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  950.     }

  951. 

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

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

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

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

  956. 

  957. 

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

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

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

  961. 

  962.     if(s->lossless){

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

  964. //            for(){

  965. //            reset_ls_coding_parameters(s, 0);

  966. 

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

  968.                 return -1;

  969.         }else{

  970.             if(s->rgb){

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

  972.                     return -1;

  973.             }else{

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

  975.                     return -1;

  976.             }

  977.         }

  978.     }else{

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

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

  981.                 return -1;

  982.         } else {

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

  984.                 return -1;

  985.         }

  986.     }

  987.     emms_c();

  988.     return 0;

  989.  out_of_range:

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

  991.     return -1;

  992. }

  993. 

  994. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  995. {

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

  997.         return -1;

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

  999.     s->restart_count = 0;

  1000.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1001. 

  1002.     return 0;

  1003. }

  1004. 

  1005. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1006. {

  1007.     int len, id, i;

  1008. 

  1009.     len = get_bits(&s->gb, 16);

  1010.     if (len < 5)

  1011.         return -1;

  1012.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1013.         return -1;

  1014. 

  1015.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1016.     id = be2me_32(id);

  1017.     len -= 6;

  1018. 

  1019.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1020.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1021.     }

  1022. 

  1023.     /* buggy AVID, it puts EOI only at every 10th frame */

  1024.     /* also this fourcc is used by non-avid files too, it holds some

  1025.        informations, but it's always present in AVID creates files */

  1026.     if (id == AV_RL32("AVI1"))

  1027.     {

  1028.         /* structure:

  1029.             4bytes      AVI1

  1030.             1bytes      polarity

  1031.             1bytes      always zero

  1032.             4bytes      field_size

  1033.             4bytes      field_size_less_padding

  1034.         */

  1035.             s->buggy_avid = 1;

  1036. //        if (s->first_picture)

  1037. //            printf("mjpeg: workarounding buggy AVID\n");

  1038.         i = get_bits(&s->gb, 8);

  1039.         if     (i==2) s->bottom_field= 1;

  1040.         else if(i==1) s->bottom_field= 0;

  1041. #if 0

  1042.         skip_bits(&s->gb, 8);

  1043.         skip_bits(&s->gb, 32);

  1044.         skip_bits(&s->gb, 32);

  1045.         len -= 10;

  1046. #endif

  1047. //        if (s->interlace_polarity)

  1048. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1049.         goto out;

  1050.     }

  1051. 

  1052. //    len -= 2;

  1053. 

  1054.     if (id == AV_RL32("JFIF"))

  1055.     {

  1056.         int t_w, t_h, v1, v2;

  1057.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1058.         v1= get_bits(&s->gb, 8);

  1059.         v2= get_bits(&s->gb, 8);

  1060.         skip_bits(&s->gb, 8);

  1061. 

  1062.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1063.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1064. 

  1065.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1066.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1067.                 v1, v2,

  1068.                 s->avctx->sample_aspect_ratio.num,

  1069.                 s->avctx->sample_aspect_ratio.den

  1070.             );

  1071. 

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

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

  1074.         if (t_w && t_h)

  1075.         {

  1076.             /* skip thumbnail */

  1077.             if (len-10-(t_w*t_h*3) > 0)

  1078.                 len -= t_w*t_h*3;

  1079.         }

  1080.         len -= 10;

  1081.         goto out;

  1082.     }

  1083. 

  1084.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1085.     {

  1086.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1087.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1088.         skip_bits(&s->gb, 16); /* version */

  1089.         skip_bits(&s->gb, 16); /* flags0 */

  1090.         skip_bits(&s->gb, 16); /* flags1 */

  1091.         skip_bits(&s->gb, 8);  /* transform */

  1092.         len -= 7;

  1093.         goto out;

  1094.     }

  1095. 

  1096.     if (id == AV_RL32("LJIF")){

  1097.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1098.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

  1099.         skip_bits(&s->gb, 16); /* version ? */

  1100.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1101.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1102.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1103.         switch( get_bits(&s->gb, 8)){

  1104.         case 1:

  1105.             s->rgb= 1;

  1106.             s->pegasus_rct=0;

  1107.             break;

  1108.         case 2:

  1109.             s->rgb= 1;

  1110.             s->pegasus_rct=1;

  1111.             break;

  1112.         default:

  1113.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1114.         }

  1115.         len -= 9;

  1116.         goto out;

  1117.     }

  1118. 

  1119.     /* Apple MJPEG-A */

  1120.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1121.     {

  1122.         id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1123.         id = be2me_32(id);

  1124.         len -= 4;

  1125.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1126.         {

  1127. #if 0

  1128.             skip_bits(&s->gb, 32); /* field size */

  1129.             skip_bits(&s->gb, 32); /* pad field size */

  1130.             skip_bits(&s->gb, 32); /* next off */

  1131.             skip_bits(&s->gb, 32); /* quant off */

  1132.             skip_bits(&s->gb, 32); /* huff off */

  1133.             skip_bits(&s->gb, 32); /* image off */

  1134.             skip_bits(&s->gb, 32); /* scan off */

  1135.             skip_bits(&s->gb, 32); /* data off */

  1136. #endif

  1137.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1138.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1139.         }

  1140.     }

  1141. 

  1142. out:

  1143.     /* slow but needed for extreme adobe jpegs */

  1144.     if (len < 0)

  1145.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1146.     while(--len > 0)

  1147.         skip_bits(&s->gb, 8);

  1148. 

  1149.     return 0;

  1150. }

  1151. 

  1152. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1153. {

  1154.     int len = get_bits(&s->gb, 16);

  1155.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1156.         char *cbuf = av_malloc(len - 1);

  1157.         if (cbuf) {

  1158.             int i;

  1159.             for (i = 0; i < len - 2; i++)

  1160.                 cbuf[i] = get_bits(&s->gb, 8);

  1161.             if (i > 0 && cbuf[i-1] == '\n')

  1162.                 cbuf[i-1] = 0;

  1163.             else

  1164.                 cbuf[i] = 0;

  1165. 

  1166.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1167.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1168. 

  1169.             /* buggy avid, it puts EOI only at every 10th frame */

  1170.             if (!strcmp(cbuf, "AVID"))

  1171.             {

  1172.                 s->buggy_avid = 1;

  1173.                 //        if (s->first_picture)

  1174.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1175.             }

  1176.             else if(!strcmp(cbuf, "CS=ITU601")){

  1177.                 s->cs_itu601= 1;

  1178.             }

  1179. 

  1180.             av_free(cbuf);

  1181.         }

  1182.     }

  1183. 

  1184.     return 0;

  1185. }

  1186. 

  1187. #if 0

  1188. static int valid_marker_list[] =

  1189. {

  1190.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1191. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1192. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1193. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1194. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1195. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1196. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1197. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1198. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1199. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1200. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1201. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1202. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1203. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1204. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1205. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1206. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1207. }

  1208. #endif

  1209. 

  1210. /* return the 8 bit start code value and update the search

  1211.    state. Return -1 if no start code found */

  1212. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1213. {

  1214.     const uint8_t *buf_ptr;

  1215.     unsigned int v, v2;

  1216.     int val;

  1217. #ifdef DEBUG

  1218.     int skipped=0;

  1219. #endif

  1220. 

  1221.     buf_ptr = *pbuf_ptr;

  1222.     while (buf_ptr < buf_end) {

  1223.         v = *buf_ptr++;

  1224.         v2 = *buf_ptr;

  1225.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1226.             val = *buf_ptr++;

  1227.             goto found;

  1228.         }

  1229. #ifdef DEBUG

  1230.         skipped++;

  1231. #endif

  1232.     }

  1233.     val = -1;

  1234. found:

  1235.     dprintf(NULL, "find_marker skipped %d bytes\n", skipped);

  1236.     *pbuf_ptr = buf_ptr;

  1237.     return val;

  1238. }

  1239. 

  1240. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1241.                               void *data, int *data_size,

  1242.                               AVPacket *avpkt)

  1243. {

  1244.     const uint8_t *buf = avpkt->data;

  1245.     int buf_size = avpkt->size;

  1246.     MJpegDecodeContext *s = avctx->priv_data;

  1247.     const uint8_t *buf_end, *buf_ptr;

  1248.     int start_code;

  1249.     AVFrame *picture = data;

  1250. 

  1251.     s->got_picture = 0; // picture from previous image can not be reused

  1252.     buf_ptr = buf;

  1253.     buf_end = buf + buf_size;

  1254.     while (buf_ptr < buf_end) {

  1255.         /* find start next marker */

  1256.         start_code = find_marker(&buf_ptr, buf_end);

  1257.         {

  1258.             /* EOF */

  1259.             if (start_code < 0) {

  1260.                 goto the_end;

  1261.             } else {

  1262.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1263. 

  1264.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1265.                 {

  1266.                     av_free(s->buffer);

  1267.                     s->buffer_size = buf_end-buf_ptr;

  1268.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1269.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1270.                         s->buffer_size);

  1271.                 }

  1272. 

  1273.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1274.                 if (start_code == SOS && !s->ls)

  1275.                 {

  1276.                     const uint8_t *src = buf_ptr;

  1277.                     uint8_t *dst = s->buffer;

  1278. 

  1279.                     while (src<buf_end)

  1280.                     {

  1281.                         uint8_t x = *(src++);

  1282. 

  1283.                         *(dst++) = x;

  1284.                         if (avctx->codec_id != CODEC_ID_THP)

  1285.                         {

  1286.                             if (x == 0xff) {

  1287.                                 while (src < buf_end && x == 0xff)

  1288.                                     x = *(src++);

  1289. 

  1290.                                 if (x >= 0xd0 && x <= 0xd7)

  1291.                                     *(dst++) = x;

  1292.                                 else if (x)

  1293.                                     break;

  1294.                             }

  1295.                         }

  1296.                     }

  1297.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1298. 

  1299.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1300.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1301.                 }

  1302.                 else if(start_code == SOS && s->ls){

  1303.                     const uint8_t *src = buf_ptr;

  1304.                     uint8_t *dst = s->buffer;

  1305.                     int bit_count = 0;

  1306.                     int t = 0, b = 0;

  1307.                     PutBitContext pb;

  1308. 

  1309.                     s->cur_scan++;

  1310. 

  1311.                     /* find marker */

  1312.                     while (src + t < buf_end){

  1313.                         uint8_t x = src[t++];

  1314.                         if (x == 0xff){

  1315.                             while((src + t < buf_end) && x == 0xff)

  1316.                                 x = src[t++];

  1317.                             if (x & 0x80) {

  1318.                                 t -= 2;

  1319.                                 break;

  1320.                             }

  1321.                         }

  1322.                     }

  1323.                     bit_count = t * 8;

  1324. 

  1325.                     init_put_bits(&pb, dst, t);

  1326. 

  1327.                     /* unescape bitstream */

  1328.                     while(b < t){

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

  1330.                         put_bits(&pb, 8, x);

  1331.                         if(x == 0xFF){

  1332.                             x = src[b++];

  1333.                             put_bits(&pb, 7, x);

  1334.                             bit_count--;

  1335.                         }

  1336.                     }

  1337.                     flush_put_bits(&pb);

  1338. 

  1339.                     init_get_bits(&s->gb, dst, bit_count);

  1340.                 }

  1341.                 else

  1342.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1343. 

  1344.                 s->start_code = start_code;

  1345.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1346.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1347.                 }

  1348. 

  1349.                 /* process markers */

  1350.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1351.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1352.                     /* APP fields */

  1353.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1354.                     mjpeg_decode_app(s);

  1355.                     /* Comment */

  1356.                 } else if (start_code == COM){

  1357.                     mjpeg_decode_com(s);

  1358.                 }

  1359. 

  1360.                 switch(start_code) {

  1361.                 case SOI:

  1362.                     s->restart_interval = 0;

  1363. 

  1364.                     s->restart_count = 0;

  1365.                     /* nothing to do on SOI */

  1366.                     break;

  1367.                 case DQT:

  1368.                     ff_mjpeg_decode_dqt(s);

  1369.                     break;

  1370.                 case DHT:

  1371.                     if(ff_mjpeg_decode_dht(s) < 0){

  1372.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1373.                         return -1;

  1374.                     }

  1375.                     break;

  1376.                 case SOF0:

  1377.                     s->lossless=0;

  1378.                     s->ls=0;

  1379.                     s->progressive=0;

  1380.                     if (ff_mjpeg_decode_sof(s) < 0)

  1381.                         return -1;

  1382.                     break;

  1383.                 case SOF2:

  1384.                     s->lossless=0;

  1385.                     s->ls=0;

  1386.                     s->progressive=1;

  1387.                     if (ff_mjpeg_decode_sof(s) < 0)

  1388.                         return -1;

  1389.                     break;

  1390.                 case SOF3:

  1391.                     s->lossless=1;

  1392.                     s->ls=0;

  1393.                     s->progressive=0;

  1394.                     if (ff_mjpeg_decode_sof(s) < 0)

  1395.                         return -1;

  1396.                     break;

  1397.                 case SOF48:

  1398.                     s->lossless=1;

  1399.                     s->ls=1;

  1400.                     s->progressive=0;

  1401.                     if (ff_mjpeg_decode_sof(s) < 0)

  1402.                         return -1;

  1403.                     break;

  1404.                 case LSE:

  1405.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1406.                         return -1;

  1407.                     break;

  1408.                 case EOI:

  1409.                     s->cur_scan = 0;

  1410.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1411.                         break;

  1412. eoi_parser:

  1413.                     if (!s->got_picture) {

  1414.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1415.                         break;

  1416.                     }

  1417.                     {

  1418.                         if (s->interlaced) {

  1419.                             s->bottom_field ^= 1;

  1420.                             /* if not bottom field, do not output image yet */

  1421.                             if (s->bottom_field == !s->interlace_polarity)

  1422.                                 goto not_the_end;

  1423.                         }

  1424.                         *picture = s->picture;

  1425.                         *data_size = sizeof(AVFrame);

  1426. 

  1427.                         if(!s->lossless){

  1428.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1429.                             picture->qstride= 0;

  1430.                             picture->qscale_table= s->qscale_table;

  1431.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1432.                             if(avctx->debug & FF_DEBUG_QP)

  1433.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1434.                             picture->quality*= FF_QP2LAMBDA;

  1435.                         }

  1436. 

  1437.                         goto the_end;

  1438.                     }

  1439.                     break;

  1440.                 case SOS:

  1441.                     if (!s->got_picture) {

  1442.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1443.                         break;

  1444.                     }

  1445.                     ff_mjpeg_decode_sos(s);

  1446.                     /* buggy avid puts EOI every 10-20th frame */

  1447.                     /* if restart period is over process EOI */

  1448.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1449.                         goto eoi_parser;

  1450.                     break;

  1451.                 case DRI:

  1452.                     mjpeg_decode_dri(s);

  1453.                     break;

  1454.                 case SOF1:

  1455.                 case SOF5:

  1456.                 case SOF6:

  1457.                 case SOF7:

  1458.                 case SOF9:

  1459.                 case SOF10:

  1460.                 case SOF11:

  1461.                 case SOF13:

  1462.                 case SOF14:

  1463.                 case SOF15:

  1464.                 case JPG:

  1465.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1466.                     break;

  1467. //                default:

  1468. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1469. //                    break;

  1470.                 }

  1471. 

  1472. not_the_end:

  1473.                 /* eof process start code */

  1474.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1475.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1476.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1477.             }

  1478.         }

  1479.     }

  1480.     if (s->got_picture) {

  1481.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1482.         goto eoi_parser;

  1483.     }

  1484.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1485.     return -1;

  1486. the_end:

  1487.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1488. //    return buf_end - buf_ptr;

  1489.     return buf_ptr - buf;

  1490. }

  1491. 

  1492. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1493. {

  1494.     MJpegDecodeContext *s = avctx->priv_data;

  1495.     int i, j;

  1496. 

  1497.     av_free(s->buffer);

  1498.     av_free(s->qscale_table);

  1499. 

  1500.     for(i=0;i<2;i++) {

  1501.         for(j=0;j<4;j++)

  1502.             free_vlc(&s->vlcs[i][j]);

  1503.     }

  1504.     for(i=0; i<MAX_COMPONENTS; i++) {

  1505.         av_freep(&s->blocks[i]);

  1506.         av_freep(&s->last_nnz[i]);

  1507.     }

  1508.     return 0;

  1509. }

  1510. 

  1511. AVCodec mjpeg_decoder = {

  1512.     "mjpeg",

  1513.     CODEC_TYPE_VIDEO,

  1514.     CODEC_ID_MJPEG,

  1515.     sizeof(MJpegDecodeContext),

  1516.     ff_mjpeg_decode_init,

  1517.     NULL,

  1518.     ff_mjpeg_decode_end,

  1519.     ff_mjpeg_decode_frame,

  1520.     CODEC_CAP_DR1,

  1521.     NULL,

  1522.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1523. };

  1524. 

  1525. AVCodec thp_decoder = {

  1526.     "thp",

  1527.     CODEC_TYPE_VIDEO,

  1528.     CODEC_ID_THP,

  1529.     sizeof(MJpegDecodeContext),

  1530.     ff_mjpeg_decode_init,

  1531.     NULL,

  1532.     ff_mjpeg_decode_end,

  1533.     ff_mjpeg_decode_frame,

  1534.     CODEC_CAP_DR1,

  1535.     NULL,

  1536.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1537. };