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

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

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

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

  299. 

  300.     switch(pix_fmt_id){

  301.     case 0x11111100:

  302.         if(s->rgb){

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

  304.         }else

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

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

  307.         break;

  308.     case 0x11000000:

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

  310.         break;

  311.     case 0x12111100:

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

  313.         break;

  314.     case 0x21111100:

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

  316.         break;

  317.     case 0x22111100:

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

  319.         break;

  320.     default:

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

  322.         return -1;

  323.     }

  324.     if(s->ls){

  325.         if(s->nb_components > 1)

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

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

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

  329.         else

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

  331.     }

  332. 

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

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

  335. 

  336.     s->picture.reference= 0;

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

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

  339.         return -1;

  340.     }

  341.     s->picture.pict_type= FF_I_TYPE;

  342.     s->picture.key_frame= 1;

  343.     s->got_picture = 1;

  344. 

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

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

  347.     }

  348. 

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

  350. 

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

  352.     {

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

  354.     }

  355. 

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

  357.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  367.         }

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

  369.     }

  370.     return 0;

  371. }

  372. 

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

  374. {

  375.     int code;

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

  377.     if (code < 0)

  378.     {

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

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

  381.         return 0xffff;

  382.     }

  383. 

  384.     if(code)

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

  386.     else

  387.         return 0;

  388. }

  389. 

  390. /* decode block and dequantize */

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

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

  393. {

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

  395. 

  396.     /* DC coef */

  397.     val = mjpeg_decode_dc(s, dc_index);

  398.     if (val == 0xffff) {

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

  400.         return -1;

  401.     }

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

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

  404.     block[0] = val;

  405.     /* AC coefs */

  406.     i = 0;

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

  408.     for(;;) {

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

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

  411. 

  412.         /* EOB */

  413.         if (code == 0x10)

  414.             break;

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

  416.         if(code != 0x100){

  417.             code &= 0xf;

  418.             if(code > MIN_CACHE_BITS - 16){

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

  420.             }

  421.             {

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

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

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

  425.             }

  426. 

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

  428. 

  429.             if (i >= 63) {

  430.                 if(i == 63){

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

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

  433.                     break;

  434.                 }

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

  436.                 return -1;

  437.             }

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

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

  440.         }

  441.     }

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

  443. 

  444.     return 0;

  445. }

  446. 

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

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

  449. {

  450.     int val;

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

  452.     val = mjpeg_decode_dc(s, dc_index);

  453.     if (val == 0xffff) {

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

  455.         return -1;

  456.     }

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

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

  459.     block[0] = val;

  460.     return 0;

  461. }

  462. 

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

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

  465.                                     int ac_index, int16_t *quant_matrix,

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

  467. {

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

  469. 

  470.     if(*EOBRUN){

  471.         (*EOBRUN)--;

  472.         return 0;

  473.     }

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

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

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

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

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

  479.         code -= 16;

  480.         if(code & 0xF) {

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

  482.             code &= 0xf;

  483.             if(code > MIN_CACHE_BITS - 16){

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

  485.             }

  486.             {

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

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

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

  490.             }

  491. 

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

  493. 

  494.             if (i >= se) {

  495.                 if(i == se){

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

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

  498.                     break;

  499.                 }

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

  501.                 return -1;

  502.             }

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

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

  505.         }else{

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

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

  508.                 i += 15;

  509.             }else{

  510.                 val = run;

  511.                 run = (1 << run);

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

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

  514.                 if(val)

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

  516.                 *EOBRUN = run - 1;

  517.                 break;

  518.             }

  519.         }

  520.     }

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

  522.     if(i > *last_nnz)

  523.         *last_nnz = i;

  524.     return 0;

  525. }

  526. 

  527. #define REFINE_BIT(j) {\

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

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

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

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

  532. }

  533. 

  534. #define ZERO_RUN \

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

  536.     if(i > last) {\

  537.         i += run;\

  538.         if(i > se) {\

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

  540.             return -1;\

  541.         }\

  542.         break;\

  543.     }\

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

  545.     if(block[j])\

  546.         REFINE_BIT(j)\

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

  548.         break;\

  549. }

  550. 

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

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

  553.                         int ac_index, int16_t *quant_matrix,

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

  555. {

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

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

  558. 

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

  560.     if(*EOBRUN)

  561.         (*EOBRUN)--;

  562.     else {

  563.         for(;;i++) {

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

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

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

  567.             code -= 16;

  568.             if(code & 0xF) {

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

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

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

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

  573.                 ZERO_RUN;

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

  575.                 val--;

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

  577.                 if(i == se) {

  578.                     if(i > *last_nnz)

  579.                         *last_nnz = i;

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

  581.                     return 0;

  582.                 }

  583.             }else{

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

  585.                 if(run == 0xF){

  586.                     ZERO_RUN;

  587.                 }else{

  588.                     val = run;

  589.                     run = (1 << run);

  590.                     if(val) {

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

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

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

  594.                     }

  595.                     *EOBRUN = run - 1;

  596.                     break;

  597.                 }

  598.             }

  599.         }

  600. 

  601.         if(i > *last_nnz)

  602.             *last_nnz = i;

  603.     }

  604. 

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

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

  607.         if(block[j])

  608.             REFINE_BIT(j)

  609.     }

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

  611. 

  612.     return 0;

  613. }

  614. #undef REFINE_BIT

  615. #undef ZERO_RUN

  616. 

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

  618.     int i, mb_x, mb_y;

  619.     uint16_t (*buffer)[4];

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

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

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

  623. 

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

  625.     buffer= s->ljpeg_buffer;

  626. 

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

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

  629.     }

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

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

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

  633. 

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

  635.             ptr += linesize >> 1;

  636. 

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

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

  639.         }

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

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

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

  643. 

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

  645.                 int pred;

  646. 

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

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

  649. 

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

  651. 

  652.                 left[i]=

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

  654.             }

  655. 

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

  657.                 align_get_bits(&s->gb);

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

  659.             }

  660.         }

  661. 

  662.         if(s->rct){

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

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

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

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

  667.             }

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

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

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

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

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

  673.             }

  674.         }else{

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

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

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

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

  679.             }

  680.         }

  681.     }

  682.     return 0;

  683. }

  684. 

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

  686.     int i, mb_x, mb_y;

  687.     const int nb_components=3;

  688. 

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

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

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

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

  693. 

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

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

  696.                     uint8_t *ptr;

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

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

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

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

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

  702.                     x = 0;

  703.                     y = 0;

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

  705. 

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

  707.                         int pred;

  708. 

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

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

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

  712.                                 pred= 128 << point_transform;

  713.                             }else{

  714.                                 pred= ptr[-1];

  715.                             }

  716.                         }else{

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

  718.                                 pred= ptr[-linesize];

  719.                             }else{

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

  721.                             }

  722.                         }

  723. 

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

  725.                             ptr += linesize >> 1;

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

  727. 

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

  729.                             x = 0;

  730.                             y++;

  731.                         }

  732.                     }

  733.                 }

  734.             }else{

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

  736.                     uint8_t *ptr;

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

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

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

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

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

  742.                     x = 0;

  743.                     y = 0;

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

  745. 

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

  747.                         int pred;

  748. 

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

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

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

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

  753.                             x = 0;

  754.                             y++;

  755.                         }

  756.                     }

  757.                 }

  758.             }

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

  760.                 align_get_bits(&s->gb);

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

  762.             }

  763.         }

  764.     }

  765.     return 0;

  766. }

  767. 

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

  769.     int i, mb_x, mb_y;

  770.     uint8_t* data[MAX_COMPONENTS];

  771.     int linesize[MAX_COMPONENTS];

  772. 

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

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

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

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

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

  778.         if(s->flipped) {

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

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

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

  782.             linesize[c] *= -1;

  783.         }

  784.     }

  785. 

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

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

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

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

  790. 

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

  792.                 uint8_t *ptr;

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

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

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

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

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

  798.                 x = 0;

  799.                 y = 0;

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

  801.                     ptr = data[c] +

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

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

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

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

  806.                     if(!s->progressive) {

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

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

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

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

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

  812.                             return -1;

  813.                         }

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

  815.                     } else {

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

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

  818.                         if(Ah)

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

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

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

  822.                             return -1;

  823.                         }

  824.                     }

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

  826. //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);

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

  828.                         x = 0;

  829.                         y++;

  830.                     }

  831.                 }

  832.             }

  833. 

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

  835.                 align_get_bits(&s->gb);

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

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

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

  839.             }

  840.         }

  841.     }

  842.     return 0;

  843. }

  844. 

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

  846.     int mb_x, mb_y;

  847.     int EOBRUN = 0;

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

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

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

  851.     int last_scan = 0;

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

  853. 

  854.     if(!Al) {

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

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

  857.     }

  858. 

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

  860.         data += linesize >> 1;

  861. 

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

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

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

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

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

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

  868.             int ret;

  869.             if(Ah)

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

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

  872.             else

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

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

  875.             if(ret < 0) {

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

  877.                 return -1;

  878.             }

  879.             if(last_scan) {

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

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

  882.             }

  883.         }

  884.     }

  885.     return 0;

  886. }

  887. 

  888. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  889. {

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

  891.     int index, id;

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

  893.     int ilv, prev_shift;

  894. 

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

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

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

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

  899.     {

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

  901.         return -1;

  902.     }

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

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

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

  906.         /* find component index */

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

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

  909.                 break;

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

  911.         {

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

  913.             return -1;

  914.         }

  915. 

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

  917. 

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

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

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

  921. 

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

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

  924. 

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

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

  927.             goto out_of_range;

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

  929.             goto out_of_range;

  930.     }

  931. 

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

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

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

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

  936. 

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

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

  939. 

  940.     if (nb_components > 1) {

  941.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  952.     }

  953. 

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

  955.         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" : "",

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

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

  958. 

  959. 

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

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

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

  963. 

  964.     if(s->lossless){

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

  966. //            for(){

  967. //            reset_ls_coding_parameters(s, 0);

  968. 

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

  970.                 return -1;

  971.         }else{

  972.             if(s->rgb){

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

  974.                     return -1;

  975.             }else{

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

  977.                     return -1;

  978.             }

  979.         }

  980.     }else{

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

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

  983.                 return -1;

  984.         } else {

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

  986.                 return -1;

  987.         }

  988.     }

  989.     emms_c();

  990.     return 0;

  991.  out_of_range:

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

  993.     return -1;

  994. }

  995. 

  996. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  997. {

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

  999.         return -1;

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

  1001.     s->restart_count = 0;

  1002.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1003. 

  1004.     return 0;

  1005. }

  1006. 

  1007. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1008. {

  1009.     int len, id, i;

  1010. 

  1011.     len = get_bits(&s->gb, 16);

  1012.     if (len < 5)

  1013.         return -1;

  1014.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1015.         return -1;

  1016. 

  1017.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1018.     id = be2me_32(id);

  1019.     len -= 6;

  1020. 

  1021.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1022.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1023.     }

  1024. 

  1025.     /* buggy AVID, it puts EOI only at every 10th frame */

  1026.     /* also this fourcc is used by non-avid files too, it holds some

  1027.        informations, but it's always present in AVID creates files */

  1028.     if (id == AV_RL32("AVI1"))

  1029.     {

  1030.         /* structure:

  1031.             4bytes      AVI1

  1032.             1bytes      polarity

  1033.             1bytes      always zero

  1034.             4bytes      field_size

  1035.             4bytes      field_size_less_padding

  1036.         */

  1037.             s->buggy_avid = 1;

  1038. //        if (s->first_picture)

  1039. //            printf("mjpeg: workarounding buggy AVID\n");

  1040.         i = get_bits(&s->gb, 8);

  1041.         if     (i==2) s->bottom_field= 1;

  1042.         else if(i==1) s->bottom_field= 0;

  1043. #if 0

  1044.         skip_bits(&s->gb, 8);

  1045.         skip_bits(&s->gb, 32);

  1046.         skip_bits(&s->gb, 32);

  1047.         len -= 10;

  1048. #endif

  1049. //        if (s->interlace_polarity)

  1050. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1051.         goto out;

  1052.     }

  1053. 

  1054. //    len -= 2;

  1055. 

  1056.     if (id == AV_RL32("JFIF"))

  1057.     {

  1058.         int t_w, t_h, v1, v2;

  1059.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1060.         v1= get_bits(&s->gb, 8);

  1061.         v2= get_bits(&s->gb, 8);

  1062.         skip_bits(&s->gb, 8);

  1063. 

  1064.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1065.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1066. 

  1067.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1068.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1069.                 v1, v2,

  1070.                 s->avctx->sample_aspect_ratio.num,

  1071.                 s->avctx->sample_aspect_ratio.den

  1072.             );

  1073. 

  1074.         t_w = get_bits(&s->gb, 8);

  1075.         t_h = get_bits(&s->gb, 8);

  1076.         if (t_w && t_h)

  1077.         {

  1078.             /* skip thumbnail */

  1079.             if (len-10-(t_w*t_h*3) > 0)

  1080.                 len -= t_w*t_h*3;

  1081.         }

  1082.         len -= 10;

  1083.         goto out;

  1084.     }

  1085. 

  1086.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1087.     {

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

  1089.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

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

  1091.         skip_bits(&s->gb, 16); /* flags0 */

  1092.         skip_bits(&s->gb, 16); /* flags1 */

  1093.         skip_bits(&s->gb, 8);  /* transform */

  1094.         len -= 7;

  1095.         goto out;

  1096.     }

  1097. 

  1098.     if (id == AV_RL32("LJIF")){

  1099.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1100.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

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

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

  1103.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1104.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1105.         switch( get_bits(&s->gb, 8)){

  1106.         case 1:

  1107.             s->rgb= 1;

  1108.             s->pegasus_rct=0;

  1109.             break;

  1110.         case 2:

  1111.             s->rgb= 1;

  1112.             s->pegasus_rct=1;

  1113.             break;

  1114.         default:

  1115.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1116.         }

  1117.         len -= 9;

  1118.         goto out;

  1119.     }

  1120. 

  1121.     /* Apple MJPEG-A */

  1122.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1123.     {

  1124.         id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1125.         id = be2me_32(id);

  1126.         len -= 4;

  1127.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1128.         {

  1129. #if 0

  1130.             skip_bits(&s->gb, 32); /* field size */

  1131.             skip_bits(&s->gb, 32); /* pad field size */

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

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

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

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

  1136.             skip_bits(&s->gb, 32); /* scan off */

  1137.             skip_bits(&s->gb, 32); /* data off */

  1138. #endif

  1139.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1140.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1141.         }

  1142.     }

  1143. 

  1144. out:

  1145.     /* slow but needed for extreme adobe jpegs */

  1146.     if (len < 0)

  1147.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1148.     while(--len > 0)

  1149.         skip_bits(&s->gb, 8);

  1150. 

  1151.     return 0;

  1152. }

  1153. 

  1154. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1155. {

  1156.     int len = get_bits(&s->gb, 16);

  1157.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1158.         char *cbuf = av_malloc(len - 1);

  1159.         if (cbuf) {

  1160.             int i;

  1161.             for (i = 0; i < len - 2; i++)

  1162.                 cbuf[i] = get_bits(&s->gb, 8);

  1163.             if (i > 0 && cbuf[i-1] == '\n')

  1164.                 cbuf[i-1] = 0;

  1165.             else

  1166.                 cbuf[i] = 0;

  1167. 

  1168.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1169.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1170. 

  1171.             /* buggy avid, it puts EOI only at every 10th frame */

  1172.             if (!strcmp(cbuf, "AVID"))

  1173.             {

  1174.                 s->buggy_avid = 1;

  1175.                 //        if (s->first_picture)

  1176.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1177.             }

  1178.             else if(!strcmp(cbuf, "CS=ITU601")){

  1179.                 s->cs_itu601= 1;

  1180.             }

  1181.             else if(len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)){

  1182.                 s->flipped = 1;

  1183.             }

  1184. 

  1185.             av_free(cbuf);

  1186.         }

  1187.     }

  1188. 

  1189.     return 0;

  1190. }

  1191. 

  1192. #if 0

  1193. static int valid_marker_list[] =

  1194. {

  1195.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

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

  1197. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1198. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1199. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1200. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1201. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1202. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1203. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1204. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1205. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1206. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1207. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1208. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1209. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1210. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1211. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1212. }

  1213. #endif

  1214. 

  1215. /* return the 8 bit start code value and update the search

  1216.    state. Return -1 if no start code found */

  1217. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1218. {

  1219.     const uint8_t *buf_ptr;

  1220.     unsigned int v, v2;

  1221.     int val;

  1222. #ifdef DEBUG

  1223.     int skipped=0;

  1224. #endif

  1225. 

  1226.     buf_ptr = *pbuf_ptr;

  1227.     while (buf_ptr < buf_end) {

  1228.         v = *buf_ptr++;

  1229.         v2 = *buf_ptr;

  1230.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1231.             val = *buf_ptr++;

  1232.             goto found;

  1233.         }

  1234. #ifdef DEBUG

  1235.         skipped++;

  1236. #endif

  1237.     }

  1238.     val = -1;

  1239. found:

  1240.     dprintf(NULL, "find_marker skipped %d bytes\n", skipped);

  1241.     *pbuf_ptr = buf_ptr;

  1242.     return val;

  1243. }

  1244. 

  1245. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1246.                               void *data, int *data_size,

  1247.                               AVPacket *avpkt)

  1248. {

  1249.     const uint8_t *buf = avpkt->data;

  1250.     int buf_size = avpkt->size;

  1251.     MJpegDecodeContext *s = avctx->priv_data;

  1252.     const uint8_t *buf_end, *buf_ptr;

  1253.     int start_code;

  1254.     AVFrame *picture = data;

  1255. 

  1256.     s->got_picture = 0; // picture from previous image can not be reused

  1257.     buf_ptr = buf;

  1258.     buf_end = buf + buf_size;

  1259.     while (buf_ptr < buf_end) {

  1260.         /* find start next marker */

  1261.         start_code = find_marker(&buf_ptr, buf_end);

  1262.         {

  1263.             /* EOF */

  1264.             if (start_code < 0) {

  1265.                 goto the_end;

  1266.             } else {

  1267.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1268. 

  1269.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1270.                 {

  1271.                     av_free(s->buffer);

  1272.                     s->buffer_size = buf_end-buf_ptr;

  1273.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1274.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1275.                         s->buffer_size);

  1276.                 }

  1277. 

  1278.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1279.                 if (start_code == SOS && !s->ls)

  1280.                 {

  1281.                     const uint8_t *src = buf_ptr;

  1282.                     uint8_t *dst = s->buffer;

  1283. 

  1284.                     while (src<buf_end)

  1285.                     {

  1286.                         uint8_t x = *(src++);

  1287. 

  1288.                         *(dst++) = x;

  1289.                         if (avctx->codec_id != CODEC_ID_THP)

  1290.                         {

  1291.                             if (x == 0xff) {

  1292.                                 while (src < buf_end && x == 0xff)

  1293.                                     x = *(src++);

  1294. 

  1295.                                 if (x >= 0xd0 && x <= 0xd7)

  1296.                                     *(dst++) = x;

  1297.                                 else if (x)

  1298.                                     break;

  1299.                             }

  1300.                         }

  1301.                     }

  1302.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1303. 

  1304.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1305.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1306.                 }

  1307.                 else if(start_code == SOS && s->ls){

  1308.                     const uint8_t *src = buf_ptr;

  1309.                     uint8_t *dst = s->buffer;

  1310.                     int bit_count = 0;

  1311.                     int t = 0, b = 0;

  1312.                     PutBitContext pb;

  1313. 

  1314.                     s->cur_scan++;

  1315. 

  1316.                     /* find marker */

  1317.                     while (src + t < buf_end){

  1318.                         uint8_t x = src[t++];

  1319.                         if (x == 0xff){

  1320.                             while((src + t < buf_end) && x == 0xff)

  1321.                                 x = src[t++];

  1322.                             if (x & 0x80) {

  1323.                                 t -= 2;

  1324.                                 break;

  1325.                             }

  1326.                         }

  1327.                     }

  1328.                     bit_count = t * 8;

  1329. 

  1330.                     init_put_bits(&pb, dst, t);

  1331. 

  1332.                     /* unescape bitstream */

  1333.                     while(b < t){

  1334.                         uint8_t x = src[b++];

  1335.                         put_bits(&pb, 8, x);

  1336.                         if(x == 0xFF){

  1337.                             x = src[b++];

  1338.                             put_bits(&pb, 7, x);

  1339.                             bit_count--;

  1340.                         }

  1341.                     }

  1342.                     flush_put_bits(&pb);

  1343. 

  1344.                     init_get_bits(&s->gb, dst, bit_count);

  1345.                 }

  1346.                 else

  1347.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1348. 

  1349.                 s->start_code = start_code;

  1350.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1351.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1352.                 }

  1353. 

  1354.                 /* process markers */

  1355.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1356.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1357.                     /* APP fields */

  1358.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1359.                     mjpeg_decode_app(s);

  1360.                     /* Comment */

  1361.                 } else if (start_code == COM){

  1362.                     mjpeg_decode_com(s);

  1363.                 }

  1364. 

  1365.                 switch(start_code) {

  1366.                 case SOI:

  1367.                     s->restart_interval = 0;

  1368. 

  1369.                     s->restart_count = 0;

  1370.                     /* nothing to do on SOI */

  1371.                     break;

  1372.                 case DQT:

  1373.                     ff_mjpeg_decode_dqt(s);

  1374.                     break;

  1375.                 case DHT:

  1376.                     if(ff_mjpeg_decode_dht(s) < 0){

  1377.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1378.                         return -1;

  1379.                     }

  1380.                     break;

  1381.                 case SOF0:

  1382.                 case SOF1:

  1383.                     s->lossless=0;

  1384.                     s->ls=0;

  1385.                     s->progressive=0;

  1386.                     if (ff_mjpeg_decode_sof(s) < 0)

  1387.                         return -1;

  1388.                     break;

  1389.                 case SOF2:

  1390.                     s->lossless=0;

  1391.                     s->ls=0;

  1392.                     s->progressive=1;

  1393.                     if (ff_mjpeg_decode_sof(s) < 0)

  1394.                         return -1;

  1395.                     break;

  1396.                 case SOF3:

  1397.                     s->lossless=1;

  1398.                     s->ls=0;

  1399.                     s->progressive=0;

  1400.                     if (ff_mjpeg_decode_sof(s) < 0)

  1401.                         return -1;

  1402.                     break;

  1403.                 case SOF48:

  1404.                     s->lossless=1;

  1405.                     s->ls=1;

  1406.                     s->progressive=0;

  1407.                     if (ff_mjpeg_decode_sof(s) < 0)

  1408.                         return -1;

  1409.                     break;

  1410.                 case LSE:

  1411.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1412.                         return -1;

  1413.                     break;

  1414.                 case EOI:

  1415.                     s->cur_scan = 0;

  1416.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1417.                         break;

  1418. eoi_parser:

  1419.                     if (!s->got_picture) {

  1420.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1421.                         break;

  1422.                     }

  1423.                     {

  1424.                         if (s->interlaced) {

  1425.                             s->bottom_field ^= 1;

  1426.                             /* if not bottom field, do not output image yet */

  1427.                             if (s->bottom_field == !s->interlace_polarity)

  1428.                                 goto not_the_end;

  1429.                         }

  1430.                         *picture = s->picture;

  1431.                         *data_size = sizeof(AVFrame);

  1432. 

  1433.                         if(!s->lossless){

  1434.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1435.                             picture->qstride= 0;

  1436.                             picture->qscale_table= s->qscale_table;

  1437.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1438.                             if(avctx->debug & FF_DEBUG_QP)

  1439.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1440.                             picture->quality*= FF_QP2LAMBDA;

  1441.                         }

  1442. 

  1443.                         goto the_end;

  1444.                     }

  1445.                     break;

  1446.                 case SOS:

  1447.                     if (!s->got_picture) {

  1448.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1449.                         break;

  1450.                     }

  1451.                     ff_mjpeg_decode_sos(s);

  1452.                     /* buggy avid puts EOI every 10-20th frame */

  1453.                     /* if restart period is over process EOI */

  1454.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1455.                         goto eoi_parser;

  1456.                     break;

  1457.                 case DRI:

  1458.                     mjpeg_decode_dri(s);

  1459.                     break;

  1460.                 case SOF5:

  1461.                 case SOF6:

  1462.                 case SOF7:

  1463.                 case SOF9:

  1464.                 case SOF10:

  1465.                 case SOF11:

  1466.                 case SOF13:

  1467.                 case SOF14:

  1468.                 case SOF15:

  1469.                 case JPG:

  1470.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1471.                     break;

  1472. //                default:

  1473. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1474. //                    break;

  1475.                 }

  1476. 

  1477. not_the_end:

  1478.                 /* eof process start code */

  1479.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1480.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1481.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1482.             }

  1483.         }

  1484.     }

  1485.     if (s->got_picture) {

  1486.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1487.         goto eoi_parser;

  1488.     }

  1489.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1490.     return -1;

  1491. the_end:

  1492.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1493. //    return buf_end - buf_ptr;

  1494.     return buf_ptr - buf;

  1495. }

  1496. 

  1497. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1498. {

  1499.     MJpegDecodeContext *s = avctx->priv_data;

  1500.     int i, j;

  1501. 

  1502.     if (s->picture.data[0])

  1503.         avctx->release_buffer(avctx, &s->picture);

  1504. 

  1505.     av_free(s->buffer);

  1506.     av_free(s->qscale_table);

  1507.     av_freep(&s->ljpeg_buffer);

  1508.     s->ljpeg_buffer_size=0;

  1509. 

  1510.     for(i=0;i<2;i++) {

  1511.         for(j=0;j<4;j++)

  1512.             free_vlc(&s->vlcs[i][j]);

  1513.     }

  1514.     for(i=0; i<MAX_COMPONENTS; i++) {

  1515.         av_freep(&s->blocks[i]);

  1516.         av_freep(&s->last_nnz[i]);

  1517.     }

  1518.     return 0;

  1519. }

  1520. 

  1521. AVCodec mjpeg_decoder = {

  1522.     "mjpeg",

  1523.     CODEC_TYPE_VIDEO,

  1524.     CODEC_ID_MJPEG,

  1525.     sizeof(MJpegDecodeContext),

  1526.     ff_mjpeg_decode_init,

  1527.     NULL,

  1528.     ff_mjpeg_decode_end,

  1529.     ff_mjpeg_decode_frame,

  1530.     CODEC_CAP_DR1,

  1531.     NULL,

  1532.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1533. };

  1534. 

  1535. AVCodec thp_decoder = {

  1536.     "thp",

  1537.     CODEC_TYPE_VIDEO,

  1538.     CODEC_ID_THP,

  1539.     sizeof(MJpegDecodeContext),

  1540.     ff_mjpeg_decode_init,

  1541.     NULL,

  1542.     ff_mjpeg_decode_end,

  1543.     ff_mjpeg_decode_frame,

  1544.     CODEC_CAP_DR1,

  1545.     NULL,

  1546.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1547. };