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FFmpeg/libavcodec/mjpegdec.c

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  1. /*

  2.  * MJPEG decoder

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

  4.  * Copyright (c) 2003 Alex Beregszaszi

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

  6.  *

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

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

  9.  *                                  by Alex Beregszaszi

  10.  *

  11.  * This file is part of FFmpeg.

  12.  *

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

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

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

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

  17.  *

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

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

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

  21.  * Lesser General Public License for more details.

  22.  *

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

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

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

  26.  */

  27. 

  28. /**

  29.  * @file

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "libavcore/imgutils.h"

  37. #include "avcodec.h"

  38. #include "dsputil.h"

  39. #include "mjpeg.h"

  40. #include "mjpegdec.h"

  41. #include "jpeglsdec.h"

  42. 

  43. 

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

  45.                       int nb_codes, int use_static, int is_ac)

  46. {

  47.     uint8_t huff_size[256];

  48.     uint16_t huff_code[256];

  49.     uint16_t huff_sym[256];

  50.     int i;

  51. 

  52.     assert(nb_codes <= 256);

  53. 

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

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

  56. 

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

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

  59. 

  60.     return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 2, 2, use_static);

  61. }

  62. 

  63. static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {

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

  65.               ff_mjpeg_val_dc, 12, 0, 0);

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

  67.               ff_mjpeg_val_dc, 12, 0, 0);

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

  69.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

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

  71.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

  72. }

  73. 

  74. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  75. {

  76.     MJpegDecodeContext *s = avctx->priv_data;

  77. 

  78.     s->avctx = avctx;

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

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

  81.     s->buffer_size = 0;

  82.     s->buffer = NULL;

  83.     s->start_code = -1;

  84.     s->first_picture = 1;

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

  86.     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;

  87. 

  88.     build_basic_mjpeg_vlc(s);

  89. 

  90.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  91.     {

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

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

  94.         if (ff_mjpeg_decode_dht(s)) {

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

  96.             build_basic_mjpeg_vlc(s);

  97.         }

  98.     }

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

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

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

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

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

  104.         }

  105.     }

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

  107.         s->flipped = 1;

  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(av_image_check_size(width, height, 0, s->avctx))

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

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

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

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

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

  298. 

  299.     switch(pix_fmt_id){

  300.     case 0x11111100:

  301.         if(s->rgb){

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

  303.         }else

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

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

  306.         break;

  307.     case 0x11000000:

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

  309.         break;

  310.     case 0x12111100:

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

  312.         break;

  313.     case 0x21111100:

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

  315.         break;

  316.     case 0x22111100:

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

  318.         break;

  319.     default:

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

  321.         return -1;

  322.     }

  323.     if(s->ls){

  324.         if(s->nb_components > 1)

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

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

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

  328.         else

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

  330.     }

  331. 

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

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

  334. 

  335.     s->picture.reference= 0;

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

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

  338.         return -1;

  339.     }

  340.     s->picture.pict_type= FF_I_TYPE;

  341.     s->picture.key_frame= 1;

  342.     s->got_picture = 1;

  343. 

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

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

  346.     }

  347. 

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

  349. 

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

  351.     {

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

  353.     }

  354. 

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

  356.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  366.         }

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

  368.     }

  369.     return 0;

  370. }

  371. 

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

  373. {

  374.     int code;

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

  376.     if (code < 0)

  377.     {

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

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

  380.         return 0xffff;

  381.     }

  382. 

  383.     if(code)

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

  385.     else

  386.         return 0;

  387. }

  388. 

  389. /* decode block and dequantize */

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

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

  392. {

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

  394. 

  395.     /* DC coef */

  396.     val = mjpeg_decode_dc(s, dc_index);

  397.     if (val == 0xffff) {

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

  399.         return -1;

  400.     }

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

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

  403.     block[0] = val;

  404.     /* AC coefs */

  405.     i = 0;

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

  407.     for(;;) {

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

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

  410. 

  411.         /* EOB */

  412.         if (code == 0x10)

  413.             break;

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

  415.         if(code != 0x100){

  416.             code &= 0xf;

  417.             if(code > MIN_CACHE_BITS - 16){

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

  419.             }

  420.             {

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

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

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

  424.             }

  425. 

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

  427. 

  428.             if (i >= 63) {

  429.                 if(i == 63){

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

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

  432.                     break;

  433.                 }

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

  435.                 return -1;

  436.             }

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

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

  439.         }

  440.     }

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

  442. 

  443.     return 0;

  444. }

  445. 

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

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

  448. {

  449.     int val;

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

  451.     val = mjpeg_decode_dc(s, dc_index);

  452.     if (val == 0xffff) {

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

  454.         return -1;

  455.     }

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

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

  458.     block[0] = val;

  459.     return 0;

  460. }

  461. 

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

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

  464.                                     int ac_index, int16_t *quant_matrix,

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

  466. {

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

  468. 

  469.     if(*EOBRUN){

  470.         (*EOBRUN)--;

  471.         return 0;

  472.     }

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

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

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

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

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

  478.         code -= 16;

  479.         if(code & 0xF) {

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

  481.             code &= 0xf;

  482.             if(code > MIN_CACHE_BITS - 16){

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

  484.             }

  485.             {

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

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

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

  489.             }

  490. 

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

  492. 

  493.             if (i >= se) {

  494.                 if(i == se){

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

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

  497.                     break;

  498.                 }

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

  500.                 return -1;

  501.             }

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

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

  504.         }else{

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

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

  507.                 i += 15;

  508.             }else{

  509.                 val = run;

  510.                 run = (1 << run);

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

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

  513.                 if(val)

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

  515.                 *EOBRUN = run - 1;

  516.                 break;

  517.             }

  518.         }

  519.     }

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

  521.     if(i > *last_nnz)

  522.         *last_nnz = i;

  523.     return 0;

  524. }

  525. 

  526. #define REFINE_BIT(j) {\

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

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

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

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

  531. }

  532. 

  533. #define ZERO_RUN \

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

  535.     if(i > last) {\

  536.         i += run;\

  537.         if(i > se) {\

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

  539.             return -1;\

  540.         }\

  541.         break;\

  542.     }\

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

  544.     if(block[j])\

  545.         REFINE_BIT(j)\

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

  547.         break;\

  548. }

  549. 

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

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

  552.                         int ac_index, int16_t *quant_matrix,

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

  554. {

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

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

  557. 

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

  559.     if(*EOBRUN)

  560.         (*EOBRUN)--;

  561.     else {

  562.         for(;;i++) {

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

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

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

  566.             code -= 16;

  567.             if(code & 0xF) {

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

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

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

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

  572.                 ZERO_RUN;

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

  574.                 val--;

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

  576.                 if(i == se) {

  577.                     if(i > *last_nnz)

  578.                         *last_nnz = i;

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

  580.                     return 0;

  581.                 }

  582.             }else{

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

  584.                 if(run == 0xF){

  585.                     ZERO_RUN;

  586.                 }else{

  587.                     val = run;

  588.                     run = (1 << run);

  589.                     if(val) {

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

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

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

  593.                     }

  594.                     *EOBRUN = run - 1;

  595.                     break;

  596.                 }

  597.             }

  598.         }

  599. 

  600.         if(i > *last_nnz)

  601.             *last_nnz = i;

  602.     }

  603. 

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

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

  606.         if(block[j])

  607.             REFINE_BIT(j)

  608.     }

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

  610. 

  611.     return 0;

  612. }

  613. #undef REFINE_BIT

  614. #undef ZERO_RUN

  615. 

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

  617.     int i, mb_x, mb_y;

  618.     uint16_t (*buffer)[4];

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

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

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

  622. 

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

  624.     buffer= s->ljpeg_buffer;

  625. 

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

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

  628.     }

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

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

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

  632. 

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

  634.             ptr += linesize >> 1;

  635. 

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

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

  638.         }

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

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

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

  642. 

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

  644.                 int pred;

  645. 

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

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

  648. 

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

  650. 

  651.                 left[i]=

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

  653.             }

  654. 

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

  656.                 align_get_bits(&s->gb);

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

  658.             }

  659.         }

  660. 

  661.         if(s->rct){

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

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

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

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

  666.             }

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

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

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

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

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

  672.             }

  673.         }else{

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

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

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

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

  678.             }

  679.         }

  680.     }

  681.     return 0;

  682. }

  683. 

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

  685.     int i, mb_x, mb_y;

  686.     const int nb_components=3;

  687. 

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

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

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

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

  692. 

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

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

  695.                     uint8_t *ptr;

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

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

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

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

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

  701.                     x = 0;

  702.                     y = 0;

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

  704. 

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

  706.                         int pred;

  707. 

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

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

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

  711.                                 pred= 128 << point_transform;

  712.                             }else{

  713.                                 pred= ptr[-1];

  714.                             }

  715.                         }else{

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

  717.                                 pred= ptr[-linesize];

  718.                             }else{

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

  720.                             }

  721.                         }

  722. 

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

  724.                             ptr += linesize >> 1;

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

  726. 

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

  728.                             x = 0;

  729.                             y++;

  730.                         }

  731.                     }

  732.                 }

  733.             }else{

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

  735.                     uint8_t *ptr;

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

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

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

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

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

  741.                     x = 0;

  742.                     y = 0;

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

  744. 

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

  746.                         int pred;

  747. 

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

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

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

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

  752.                             x = 0;

  753.                             y++;

  754.                         }

  755.                     }

  756.                 }

  757.             }

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

  759.                 align_get_bits(&s->gb);

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

  761.             }

  762.         }

  763.     }

  764.     return 0;

  765. }

  766. 

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

  768.     int i, mb_x, mb_y;

  769.     uint8_t* data[MAX_COMPONENTS];

  770.     int linesize[MAX_COMPONENTS];

  771. 

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

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

  774.         s->flipped = 0;

  775.     }

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

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

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

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

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

  781.         if(s->flipped) {

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

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

  784.             linesize[c] *= -1;

  785.         }

  786.     }

  787. 

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

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

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

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

  792. 

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

  794.                 uint8_t *ptr;

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

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

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

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

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

  800.                 x = 0;

  801.                 y = 0;

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

  803.                     ptr = data[c] +

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

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

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

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

  808.                     if(!s->progressive) {

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

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

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

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

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

  814.                             return -1;

  815.                         }

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

  817.                     } else {

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

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

  820.                         if(Ah)

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

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

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

  824.                             return -1;

  825.                         }

  826.                     }

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

  828. //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);

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

  830.                         x = 0;

  831.                         y++;

  832.                     }

  833.                 }

  834.             }

  835. 

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

  837.                 align_get_bits(&s->gb);

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

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

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

  841.             }

  842.         }

  843.     }

  844.     return 0;

  845. }

  846. 

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

  848.     int mb_x, mb_y;

  849.     int EOBRUN = 0;

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

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

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

  853.     int last_scan = 0;

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

  855. 

  856.     if(!Al) {

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

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

  859.     }

  860. 

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

  862.         data += linesize >> 1;

  863. 

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

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

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

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

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

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

  870.             int ret;

  871.             if(Ah)

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

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

  874.             else

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

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

  877.             if(ret < 0) {

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

  879.                 return -1;

  880.             }

  881.             if(last_scan) {

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

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

  884.             }

  885.         }

  886.     }

  887.     return 0;

  888. }

  889. 

  890. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  891. {

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

  893.     int index, id;

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

  895.     int ilv, prev_shift;

  896. 

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

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

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

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

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

  902.         return -1;

  903.     }

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

  905.     {

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

  907.         return -1;

  908.     }

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

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

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

  912.         /* find component index */

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

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

  915.                 break;

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

  917.         {

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

  919.             return -1;

  920.         }

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

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

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

  924.             index = 3 - i;

  925. 

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

  927. 

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

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

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

  931. 

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

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

  934. 

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

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

  937.             goto out_of_range;

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

  939.             goto out_of_range;

  940.     }

  941. 

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

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

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

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

  946. 

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

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

  949. 

  950.     if (nb_components > 1) {

  951.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  962.     }

  963. 

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

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

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

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

  968. 

  969. 

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

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

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

  973. 

  974.     if(s->lossless){

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

  976. //            for(){

  977. //            reset_ls_coding_parameters(s, 0);

  978. 

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

  980.                 return -1;

  981.         }else{

  982.             if(s->rgb){

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

  984.                     return -1;

  985.             }else{

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

  987.                     return -1;

  988.             }

  989.         }

  990.     }else{

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

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

  993.                 return -1;

  994.         } else {

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

  996.                 return -1;

  997.         }

  998.     }

  999.     emms_c();

  1000.     return 0;

  1001.  out_of_range:

  1002.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1003.     return -1;

  1004. }

  1005. 

  1006. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1007. {

  1008.     if (get_bits(&s->gb, 16) != 4)

  1009.         return -1;

  1010.     s->restart_interval = get_bits(&s->gb, 16);

  1011.     s->restart_count = 0;

  1012.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1013. 

  1014.     return 0;

  1015. }

  1016. 

  1017. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1018. {

  1019.     int len, id, i;

  1020. 

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

  1022.     if (len < 5)

  1023.         return -1;

  1024.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1025.         return -1;

  1026. 

  1027.     id = get_bits_long(&s->gb, 32);

  1028.     id = av_be2ne32(id);

  1029.     len -= 6;

  1030. 

  1031.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1032.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1033.     }

  1034. 

  1035.     /* buggy AVID, it puts EOI only at every 10th frame */

  1036.     /* also this fourcc is used by non-avid files too, it holds some

  1037.        informations, but it's always present in AVID creates files */

  1038.     if (id == AV_RL32("AVI1"))

  1039.     {

  1040.         /* structure:

  1041.             4bytes      AVI1

  1042.             1bytes      polarity

  1043.             1bytes      always zero

  1044.             4bytes      field_size

  1045.             4bytes      field_size_less_padding

  1046.         */

  1047.             s->buggy_avid = 1;

  1048. //        if (s->first_picture)

  1049. //            printf("mjpeg: workarounding buggy AVID\n");

  1050.         i = get_bits(&s->gb, 8);

  1051.         if     (i==2) s->bottom_field= 1;

  1052.         else if(i==1) s->bottom_field= 0;

  1053. #if 0

  1054.         skip_bits(&s->gb, 8);

  1055.         skip_bits(&s->gb, 32);

  1056.         skip_bits(&s->gb, 32);

  1057.         len -= 10;

  1058. #endif

  1059. //        if (s->interlace_polarity)

  1060. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1061.         goto out;

  1062.     }

  1063. 

  1064. //    len -= 2;

  1065. 

  1066.     if (id == AV_RL32("JFIF"))

  1067.     {

  1068.         int t_w, t_h, v1, v2;

  1069.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1070.         v1= get_bits(&s->gb, 8);

  1071.         v2= get_bits(&s->gb, 8);

  1072.         skip_bits(&s->gb, 8);

  1073. 

  1074.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1075.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1076. 

  1077.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1078.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1079.                 v1, v2,

  1080.                 s->avctx->sample_aspect_ratio.num,

  1081.                 s->avctx->sample_aspect_ratio.den

  1082.             );

  1083. 

  1084.         t_w = get_bits(&s->gb, 8);

  1085.         t_h = get_bits(&s->gb, 8);

  1086.         if (t_w && t_h)

  1087.         {

  1088.             /* skip thumbnail */

  1089.             if (len-10-(t_w*t_h*3) > 0)

  1090.                 len -= t_w*t_h*3;

  1091.         }

  1092.         len -= 10;

  1093.         goto out;

  1094.     }

  1095. 

  1096.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1097.     {

  1098.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1099.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1100.         skip_bits(&s->gb, 16); /* version */

  1101.         skip_bits(&s->gb, 16); /* flags0 */

  1102.         skip_bits(&s->gb, 16); /* flags1 */

  1103.         skip_bits(&s->gb, 8);  /* transform */

  1104.         len -= 7;

  1105.         goto out;

  1106.     }

  1107. 

  1108.     if (id == AV_RL32("LJIF")){

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

  1110.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

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

  1112.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1113.         skip_bits(&s->gb, 16); /* unknwon always 0? */

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

  1115.         switch( get_bits(&s->gb, 8)){

  1116.         case 1:

  1117.             s->rgb= 1;

  1118.             s->pegasus_rct=0;

  1119.             break;

  1120.         case 2:

  1121.             s->rgb= 1;

  1122.             s->pegasus_rct=1;

  1123.             break;

  1124.         default:

  1125.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1126.         }

  1127.         len -= 9;

  1128.         goto out;

  1129.     }

  1130. 

  1131.     /* Apple MJPEG-A */

  1132.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1133.     {

  1134.         id = get_bits_long(&s->gb, 32);

  1135.         id = av_be2ne32(id);

  1136.         len -= 4;

  1137.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1138.         {

  1139. #if 0

  1140.             skip_bits(&s->gb, 32); /* field size */

  1141.             skip_bits(&s->gb, 32); /* pad field size */

  1142.             skip_bits(&s->gb, 32); /* next off */

  1143.             skip_bits(&s->gb, 32); /* quant off */

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

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

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

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

  1148. #endif

  1149.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1150.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1151.         }

  1152.     }

  1153. 

  1154. out:

  1155.     /* slow but needed for extreme adobe jpegs */

  1156.     if (len < 0)

  1157.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1158.     while(--len > 0)

  1159.         skip_bits(&s->gb, 8);

  1160. 

  1161.     return 0;

  1162. }

  1163. 

  1164. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1165. {

  1166.     int len = get_bits(&s->gb, 16);

  1167.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1168.         char *cbuf = av_malloc(len - 1);

  1169.         if (cbuf) {

  1170.             int i;

  1171.             for (i = 0; i < len - 2; i++)

  1172.                 cbuf[i] = get_bits(&s->gb, 8);

  1173.             if (i > 0 && cbuf[i-1] == '\n')

  1174.                 cbuf[i-1] = 0;

  1175.             else

  1176.                 cbuf[i] = 0;

  1177. 

  1178.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1179.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1180. 

  1181.             /* buggy avid, it puts EOI only at every 10th frame */

  1182.             if (!strcmp(cbuf, "AVID"))

  1183.             {

  1184.                 s->buggy_avid = 1;

  1185.                 //        if (s->first_picture)

  1186.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1187.             }

  1188.             else if(!strcmp(cbuf, "CS=ITU601")){

  1189.                 s->cs_itu601= 1;

  1190.             }

  1191.             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||

  1192.                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){

  1193.                 s->flipped = 1;

  1194.             }

  1195. 

  1196.             av_free(cbuf);

  1197.         }

  1198.     }

  1199. 

  1200.     return 0;

  1201. }

  1202. 

  1203. #if 0

  1204. static int valid_marker_list[] =

  1205. {

  1206.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

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

  1208. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1209. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1210. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1211. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1212. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1213. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1214. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1215. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1216. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1217. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

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

  1219. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1220. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1221. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1222. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1223. }

  1224. #endif

  1225. 

  1226. /* return the 8 bit start code value and update the search

  1227.    state. Return -1 if no start code found */

  1228. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1229. {

  1230.     const uint8_t *buf_ptr;

  1231.     unsigned int v, v2;

  1232.     int val;

  1233. #ifdef DEBUG

  1234.     int skipped=0;

  1235. #endif

  1236. 

  1237.     buf_ptr = *pbuf_ptr;

  1238.     while (buf_ptr < buf_end) {

  1239.         v = *buf_ptr++;

  1240.         v2 = *buf_ptr;

  1241.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1242.             val = *buf_ptr++;

  1243.             goto found;

  1244.         }

  1245. #ifdef DEBUG

  1246.         skipped++;

  1247. #endif

  1248.     }

  1249.     val = -1;

  1250. found:

  1251.     dprintf(NULL, "find_marker skipped %d bytes\n", skipped);

  1252.     *pbuf_ptr = buf_ptr;

  1253.     return val;

  1254. }

  1255. 

  1256. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1257.                               void *data, int *data_size,

  1258.                               AVPacket *avpkt)

  1259. {

  1260.     const uint8_t *buf = avpkt->data;

  1261.     int buf_size = avpkt->size;

  1262.     MJpegDecodeContext *s = avctx->priv_data;

  1263.     const uint8_t *buf_end, *buf_ptr;

  1264.     int start_code;

  1265.     AVFrame *picture = data;

  1266. 

  1267.     s->got_picture = 0; // picture from previous image can not be reused

  1268.     buf_ptr = buf;

  1269.     buf_end = buf + buf_size;

  1270.     while (buf_ptr < buf_end) {

  1271.         /* find start next marker */

  1272.         start_code = find_marker(&buf_ptr, buf_end);

  1273.         {

  1274.             /* EOF */

  1275.             if (start_code < 0) {

  1276.                 goto the_end;

  1277.             } else {

  1278.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1279. 

  1280.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1281.                 {

  1282.                     av_free(s->buffer);

  1283.                     s->buffer_size = buf_end-buf_ptr;

  1284.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1285.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1286.                         s->buffer_size);

  1287.                 }

  1288. 

  1289.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1290.                 if (start_code == SOS && !s->ls)

  1291.                 {

  1292.                     const uint8_t *src = buf_ptr;

  1293.                     uint8_t *dst = s->buffer;

  1294. 

  1295.                     while (src<buf_end)

  1296.                     {

  1297.                         uint8_t x = *(src++);

  1298. 

  1299.                         *(dst++) = x;

  1300.                         if (avctx->codec_id != CODEC_ID_THP)

  1301.                         {

  1302.                             if (x == 0xff) {

  1303.                                 while (src < buf_end && x == 0xff)

  1304.                                     x = *(src++);

  1305. 

  1306.                                 if (x >= 0xd0 && x <= 0xd7)

  1307.                                     *(dst++) = x;

  1308.                                 else if (x)

  1309.                                     break;

  1310.                             }

  1311.                         }

  1312.                     }

  1313.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1314. 

  1315.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1316.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1317.                 }

  1318.                 else if(start_code == SOS && s->ls){

  1319.                     const uint8_t *src = buf_ptr;

  1320.                     uint8_t *dst = s->buffer;

  1321.                     int bit_count = 0;

  1322.                     int t = 0, b = 0;

  1323.                     PutBitContext pb;

  1324. 

  1325.                     s->cur_scan++;

  1326. 

  1327.                     /* find marker */

  1328.                     while (src + t < buf_end){

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

  1330.                         if (x == 0xff){

  1331.                             while((src + t < buf_end) && x == 0xff)

  1332.                                 x = src[t++];

  1333.                             if (x & 0x80) {

  1334.                                 t -= 2;

  1335.                                 break;

  1336.                             }

  1337.                         }

  1338.                     }

  1339.                     bit_count = t * 8;

  1340. 

  1341.                     init_put_bits(&pb, dst, t);

  1342. 

  1343.                     /* unescape bitstream */

  1344.                     while(b < t){

  1345.                         uint8_t x = src[b++];

  1346.                         put_bits(&pb, 8, x);

  1347.                         if(x == 0xFF){

  1348.                             x = src[b++];

  1349.                             put_bits(&pb, 7, x);

  1350.                             bit_count--;

  1351.                         }

  1352.                     }

  1353.                     flush_put_bits(&pb);

  1354. 

  1355.                     init_get_bits(&s->gb, dst, bit_count);

  1356.                 }

  1357.                 else

  1358.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1359. 

  1360.                 s->start_code = start_code;

  1361.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1362.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1363.                 }

  1364. 

  1365.                 /* process markers */

  1366.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1367.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1368.                     /* APP fields */

  1369.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1370.                     mjpeg_decode_app(s);

  1371.                     /* Comment */

  1372.                 } else if (start_code == COM){

  1373.                     mjpeg_decode_com(s);

  1374.                 }

  1375. 

  1376.                 switch(start_code) {

  1377.                 case SOI:

  1378.                     s->restart_interval = 0;

  1379. 

  1380.                     s->restart_count = 0;

  1381.                     /* nothing to do on SOI */

  1382.                     break;

  1383.                 case DQT:

  1384.                     ff_mjpeg_decode_dqt(s);

  1385.                     break;

  1386.                 case DHT:

  1387.                     if(ff_mjpeg_decode_dht(s) < 0){

  1388.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1389.                         return -1;

  1390.                     }

  1391.                     break;

  1392.                 case SOF0:

  1393.                 case SOF1:

  1394.                     s->lossless=0;

  1395.                     s->ls=0;

  1396.                     s->progressive=0;

  1397.                     if (ff_mjpeg_decode_sof(s) < 0)

  1398.                         return -1;

  1399.                     break;

  1400.                 case SOF2:

  1401.                     s->lossless=0;

  1402.                     s->ls=0;

  1403.                     s->progressive=1;

  1404.                     if (ff_mjpeg_decode_sof(s) < 0)

  1405.                         return -1;

  1406.                     break;

  1407.                 case SOF3:

  1408.                     s->lossless=1;

  1409.                     s->ls=0;

  1410.                     s->progressive=0;

  1411.                     if (ff_mjpeg_decode_sof(s) < 0)

  1412.                         return -1;

  1413.                     break;

  1414.                 case SOF48:

  1415.                     s->lossless=1;

  1416.                     s->ls=1;

  1417.                     s->progressive=0;

  1418.                     if (ff_mjpeg_decode_sof(s) < 0)

  1419.                         return -1;

  1420.                     break;

  1421.                 case LSE:

  1422.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1423.                         return -1;

  1424.                     break;

  1425.                 case EOI:

  1426.                     s->cur_scan = 0;

  1427.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1428.                         break;

  1429. eoi_parser:

  1430.                     if (!s->got_picture) {

  1431.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1432.                         break;

  1433.                     }

  1434.                     {

  1435.                         if (s->interlaced) {

  1436.                             s->bottom_field ^= 1;

  1437.                             /* if not bottom field, do not output image yet */

  1438.                             if (s->bottom_field == !s->interlace_polarity)

  1439.                                 goto not_the_end;

  1440.                         }

  1441.                         *picture = s->picture;

  1442.                         *data_size = sizeof(AVFrame);

  1443. 

  1444.                         if(!s->lossless){

  1445.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1446.                             picture->qstride= 0;

  1447.                             picture->qscale_table= s->qscale_table;

  1448.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1449.                             if(avctx->debug & FF_DEBUG_QP)

  1450.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1451.                             picture->quality*= FF_QP2LAMBDA;

  1452.                         }

  1453. 

  1454.                         goto the_end;

  1455.                     }

  1456.                     break;

  1457.                 case SOS:

  1458.                     if (!s->got_picture) {

  1459.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1460.                         break;

  1461.                     }

  1462.                     ff_mjpeg_decode_sos(s);

  1463.                     /* buggy avid puts EOI every 10-20th frame */

  1464.                     /* if restart period is over process EOI */

  1465.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1466.                         goto eoi_parser;

  1467.                     break;

  1468.                 case DRI:

  1469.                     mjpeg_decode_dri(s);

  1470.                     break;

  1471.                 case SOF5:

  1472.                 case SOF6:

  1473.                 case SOF7:

  1474.                 case SOF9:

  1475.                 case SOF10:

  1476.                 case SOF11:

  1477.                 case SOF13:

  1478.                 case SOF14:

  1479.                 case SOF15:

  1480.                 case JPG:

  1481.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1482.                     break;

  1483. //                default:

  1484. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1485. //                    break;

  1486.                 }

  1487. 

  1488. not_the_end:

  1489.                 /* eof process start code */

  1490.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1491.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

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

  1493.             }

  1494.         }

  1495.     }

  1496.     if (s->got_picture) {

  1497.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1498.         goto eoi_parser;

  1499.     }

  1500.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1501.     return -1;

  1502. the_end:

  1503.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1504. //    return buf_end - buf_ptr;

  1505.     return buf_ptr - buf;

  1506. }

  1507. 

  1508. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1509. {

  1510.     MJpegDecodeContext *s = avctx->priv_data;

  1511.     int i, j;

  1512. 

  1513.     if (s->picture.data[0])

  1514.         avctx->release_buffer(avctx, &s->picture);

  1515. 

  1516.     av_free(s->buffer);

  1517.     av_free(s->qscale_table);

  1518.     av_freep(&s->ljpeg_buffer);

  1519.     s->ljpeg_buffer_size=0;

  1520. 

  1521.     for(i=0;i<2;i++) {

  1522.         for(j=0;j<4;j++)

  1523.             free_vlc(&s->vlcs[i][j]);

  1524.     }

  1525.     for(i=0; i<MAX_COMPONENTS; i++) {

  1526.         av_freep(&s->blocks[i]);

  1527.         av_freep(&s->last_nnz[i]);

  1528.     }

  1529.     return 0;

  1530. }

  1531. 

  1532. AVCodec mjpeg_decoder = {

  1533.     "mjpeg",

  1534.     AVMEDIA_TYPE_VIDEO,

  1535.     CODEC_ID_MJPEG,

  1536.     sizeof(MJpegDecodeContext),

  1537.     ff_mjpeg_decode_init,

  1538.     NULL,

  1539.     ff_mjpeg_decode_end,

  1540.     ff_mjpeg_decode_frame,

  1541.     CODEC_CAP_DR1,

  1542.     NULL,

  1543.     .max_lowres = 8,

  1544.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1545. };

  1546. 

  1547. AVCodec thp_decoder = {

  1548.     "thp",

  1549.     AVMEDIA_TYPE_VIDEO,

  1550.     CODEC_ID_THP,

  1551.     sizeof(MJpegDecodeContext),

  1552.     ff_mjpeg_decode_init,

  1553.     NULL,

  1554.     ff_mjpeg_decode_end,

  1555.     ff_mjpeg_decode_frame,

  1556.     CODEC_CAP_DR1,

  1557.     NULL,

  1558.     .max_lowres = 3,

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

  1560. };