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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 Libav.

  12.  *

  13.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

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

  26.  */

  27. 

  28. /**

  29.  * @file

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "libavutil/imgutils.h"

  37. #include "libavutil/opt.h"

  38. #include "avcodec.h"

  39. #include "dsputil.h"

  40. #include "mjpeg.h"

  41. #include "mjpegdec.h"

  42. #include "jpeglsdec.h"

  43. 

  44. 

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

  46.                       int nb_codes, int use_static, int is_ac)

  47. {

  48.     uint8_t huff_size[256];

  49.     uint16_t huff_code[256];

  50.     uint16_t huff_sym[256];

  51.     int i;

  52. 

  53.     assert(nb_codes <= 256);

  54. 

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

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

  57. 

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

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

  60. 

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

  62. 

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

  64. }

  65. 

  66. static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {

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

  68.               ff_mjpeg_val_dc, 12, 0, 0);

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

  70.               ff_mjpeg_val_dc, 12, 0, 0);

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

  72.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

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

  74.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

  75.     build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,

  76.               ff_mjpeg_val_ac_luminance, 251, 0, 0);

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

  78.               ff_mjpeg_val_ac_chrominance, 251, 0, 0);

  79. }

  80. 

  81. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  82. {

  83.     MJpegDecodeContext *s = avctx->priv_data;

  84. 

  85.     if (!s->picture_ptr)

  86.         s->picture_ptr = &s->picture;

  87. 

  88.     s->avctx = avctx;

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

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

  91.     s->buffer_size = 0;

  92.     s->buffer = NULL;

  93.     s->start_code = -1;

  94.     s->first_picture = 1;

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

  96.     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;

  97. 

  98.     build_basic_mjpeg_vlc(s);

  99. 

  100. #if FF_API_MJPEG_GLOBAL_OPTS

  101.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  102.         s->extern_huff = 1;

  103. #endif

  104.     if (s->extern_huff)

  105.     {

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

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

  108.         if (ff_mjpeg_decode_dht(s)) {

  109.             av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table\n");

  110.             return AVERROR_INVALIDDATA;

  111.         }

  112.     }

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

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

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

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

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

  118.         }

  119.     }

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

  121.         s->flipped = 1;

  122. 

  123.     return 0;

  124. }

  125. 

  126. 

  127. /* quantize tables */

  128. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  129. {

  130.     int len, index, i, j;

  131. 

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

  133. 

  134.     while (len >= 65) {

  135.         /* only 8 bit precision handled */

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

  137.         {

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

  139.             return -1;

  140.         }

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

  142.         if (index >= 4)

  143.             return -1;

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

  145.         /* read quant table */

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

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

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

  149.         }

  150. 

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

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

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

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

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

  156.         len -= 65;

  157.     }

  158. 

  159.     return 0;

  160. }

  161. 

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

  163. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  164. {

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

  166.     uint8_t bits_table[17];

  167.     uint8_t val_table[256];

  168. 

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

  170. 

  171.     while (len > 0) {

  172.         if (len < 17)

  173.             return -1;

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

  175.         if (class >= 2)

  176.             return -1;

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

  178.         if (index >= 4)

  179.             return -1;

  180.         n = 0;

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

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

  183.             n += bits_table[i];

  184.         }

  185.         len -= 17;

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

  187.             return -1;

  188. 

  189.         code_max = 0;

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

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

  192.             if (v > code_max)

  193.                 code_max = v;

  194.             val_table[i] = v;

  195.         }

  196.         len -= n;

  197. 

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

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

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

  201.                class, index, code_max + 1);

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

  203.             return -1;

  204.         }

  205. 

  206.         if(class>0){

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

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

  209.             return -1;

  210.             }

  211.         }

  212.     }

  213.     return 0;

  214. }

  215. 

  216. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  217. {

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

  219. 

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

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

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

  223. 

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

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

  226. 

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

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

  229.         return -1;

  230.     }

  231. 

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

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

  234. 

  235.     //HACK for odd_height.mov

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

  237.         height= s->height;

  238. 

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

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

  241.         return -1;

  242. 

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

  244.     if (nb_components <= 0 ||

  245.         nb_components > MAX_COMPONENTS)

  246.         return -1;

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

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

  249.         return -1;

  250.     }

  251.     s->nb_components = nb_components;

  252.     s->h_max = 1;

  253.     s->v_max = 1;

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

  255.         /* component id */

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

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

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

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

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

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

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

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

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

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

  266.             return -1;

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

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

  269.     }

  270. 

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

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

  273.         return -1;

  274.     }

  275. 

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

  277. 

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

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

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

  281.         av_freep(&s->qscale_table);

  282. 

  283.         s->width = width;

  284.         s->height = height;

  285.         s->interlaced = 0;

  286. 

  287.         /* test interlaced mode */

  288.         if (s->first_picture &&

  289.             s->org_height != 0 &&

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

  291.             s->interlaced = 1;

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

  293.             s->picture_ptr->interlaced_frame = 1;

  294.             s->picture_ptr->top_field_first = !s->interlace_polarity;

  295.             height *= 2;

  296.         }

  297. 

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

  299. 

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

  301. 

  302.         s->first_picture = 0;

  303.     }

  304. 

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

  306.         return 0;

  307. 

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

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

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

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

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

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

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

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

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

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

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

  319. 

  320.     switch(pix_fmt_id){

  321.     case 0x11111100:

  322.         if(s->rgb){

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

  324.         }else

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

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

  327.         break;

  328.     case 0x11000000:

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

  330.         break;

  331.     case 0x12111100:

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

  333.         break;

  334.     case 0x21111100:

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

  336.         break;

  337.     case 0x22111100:

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

  339.         break;

  340.     default:

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

  342.         return -1;

  343.     }

  344.     if(s->ls){

  345.         if(s->nb_components > 1)

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

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

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

  349.         else

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

  351.     }

  352. 

  353.     if(s->picture_ptr->data[0])

  354.         s->avctx->release_buffer(s->avctx, s->picture_ptr);

  355. 

  356.     if(s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0){

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

  358.         return -1;

  359.     }

  360.     s->picture_ptr->pict_type= AV_PICTURE_TYPE_I;

  361.     s->picture_ptr->key_frame= 1;

  362.     s->got_picture = 1;

  363. 

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

  365.         s->linesize[i]= s->picture_ptr->linesize[i] << s->interlaced;

  366.     }

  367. 

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

  369. 

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

  371.     {

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

  373.     }

  374. 

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

  376.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  386.         }

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

  388.     }

  389.     return 0;

  390. }

  391. 

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

  393. {

  394.     int code;

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

  396.     if (code < 0)

  397.     {

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

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

  400.         return 0xffff;

  401.     }

  402. 

  403.     if(code)

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

  405.     else

  406.         return 0;

  407. }

  408. 

  409. /* decode block and dequantize */

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

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

  412. {

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

  414. 

  415.     /* DC coef */

  416.     val = mjpeg_decode_dc(s, dc_index);

  417.     if (val == 0xffff) {

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

  419.         return -1;

  420.     }

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

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

  423.     block[0] = val;

  424.     /* AC coefs */

  425.     i = 0;

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

  427.     do {

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

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

  430. 

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

  432.             code &= 0xf;

  433.         if(code){

  434.             if(code > MIN_CACHE_BITS - 16){

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

  436.             }

  437.             {

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

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

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

  441.             }

  442. 

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

  444. 

  445.             if (i > 63) {

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

  447.                 return -1;

  448.             }

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

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

  451.         }

  452.     }while(i<63);

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

  454. 

  455.     return 0;

  456. }

  457. 

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

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

  460. {

  461.     int val;

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

  463.     val = mjpeg_decode_dc(s, dc_index);

  464.     if (val == 0xffff) {

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

  466.         return -1;

  467.     }

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

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

  470.     block[0] = val;

  471.     return 0;

  472. }

  473. 

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

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

  476.                                     int ac_index, int16_t *quant_matrix,

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

  478. {

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

  480. 

  481.     if(*EOBRUN){

  482.         (*EOBRUN)--;

  483.         return 0;

  484.     }

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

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

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

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

  489. 

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

  491.         code &= 0xF;

  492.         if(code) {

  493.             i += run;

  494.             if(code > MIN_CACHE_BITS - 16){

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

  496.             }

  497.             {

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

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

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

  501.             }

  502. 

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

  504. 

  505.             if (i >= se) {

  506.                 if(i == se){

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

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

  509.                     break;

  510.                 }

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

  512.                 return -1;

  513.             }

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

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

  516.         }else{

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

  518.                 i += 15;

  519.                 if (i >= se) {

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

  521.                     return -1;

  522.                 }

  523.             }else{

  524.                 val = (1 << run);

  525.                 if(run){

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

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

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

  529.                 }

  530.                 *EOBRUN = val - 1;

  531.                 break;

  532.             }

  533.         }

  534.     }

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

  536.     if(i > *last_nnz)

  537.         *last_nnz = i;

  538.     return 0;

  539. }

  540. 

  541. #define REFINE_BIT(j) {\

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

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

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

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

  546. }

  547. 

  548. #define ZERO_RUN \

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

  550.     if(i > last) {\

  551.         i += run;\

  552.         if(i > se) {\

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

  554.             return -1;\

  555.         }\

  556.         break;\

  557.     }\

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

  559.     if(block[j])\

  560.         REFINE_BIT(j)\

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

  562.         break;\

  563. }

  564. 

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

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

  567.                         int ac_index, int16_t *quant_matrix,

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

  569. {

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

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

  572. 

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

  574.     if(*EOBRUN)

  575.         (*EOBRUN)--;

  576.     else {

  577.         for(;;i++) {

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

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

  580. 

  581.             if(code & 0xF) {

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

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

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

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

  586.                 ZERO_RUN;

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

  588.                 val--;

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

  590.                 if(i == se) {

  591.                     if(i > *last_nnz)

  592.                         *last_nnz = i;

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

  594.                     return 0;

  595.                 }

  596.             }else{

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

  598.                 if(run == 0xF){

  599.                     ZERO_RUN;

  600.                 }else{

  601.                     val = run;

  602.                     run = (1 << run);

  603.                     if(val) {

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

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

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

  607.                     }

  608.                     *EOBRUN = run - 1;

  609.                     break;

  610.                 }

  611.             }

  612.         }

  613. 

  614.         if(i > *last_nnz)

  615.             *last_nnz = i;

  616.     }

  617. 

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

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

  620.         if(block[j])

  621.             REFINE_BIT(j)

  622.     }

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

  624. 

  625.     return 0;

  626. }

  627. #undef REFINE_BIT

  628. #undef ZERO_RUN

  629. 

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

  631.     int i, mb_x, mb_y;

  632.     uint16_t (*buffer)[4];

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

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

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

  636. 

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

  638.     buffer= s->ljpeg_buffer;

  639. 

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

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

  642.     }

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

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

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

  646. 

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

  648.             ptr += linesize >> 1;

  649. 

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

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

  652.         }

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

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

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

  656. 

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

  658.                 int pred;

  659. 

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

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

  662. 

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

  664. 

  665.                 left[i]=

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

  667.             }

  668. 

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

  670.                 align_get_bits(&s->gb);

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

  672.             }

  673.         }

  674. 

  675.         if(s->rct){

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

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

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

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

  680.             }

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

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

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

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

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

  686.             }

  687.         }else{

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

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

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

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

  692.             }

  693.         }

  694.     }

  695.     return 0;

  696. }

  697. 

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

  699.     int i, mb_x, mb_y;

  700.     const int nb_components=3;

  701. 

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

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

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

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

  706. 

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

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

  709.                     uint8_t *ptr;

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

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

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

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

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

  715.                     x = 0;

  716.                     y = 0;

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

  718. 

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

  720.                         int pred;

  721. 

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

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

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

  725.                                 pred= 128 << point_transform;

  726.                             }else{

  727.                                 pred= ptr[-1];

  728.                             }

  729.                         }else{

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

  731.                                 pred= ptr[-linesize];

  732.                             }else{

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

  734.                             }

  735.                         }

  736. 

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

  738.                             ptr += linesize >> 1;

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

  740. 

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

  742.                             x = 0;

  743.                             y++;

  744.                         }

  745.                     }

  746.                 }

  747.             }else{

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

  749.                     uint8_t *ptr;

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

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

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

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

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

  755.                     x = 0;

  756.                     y = 0;

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

  758. 

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

  760.                         int pred;

  761. 

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

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

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

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

  766.                             x = 0;

  767.                             y++;

  768.                         }

  769.                     }

  770.                 }

  771.             }

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

  773.                 align_get_bits(&s->gb);

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

  775.             }

  776.         }

  777.     }

  778.     return 0;

  779. }

  780. 

  781. static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,

  782.                                               int linesize, int lowres)

  783. {

  784.     switch (lowres) {

  785.     case 0: copy_block8(dst, src, linesize, linesize, 8);

  786.         break;

  787.     case 1: copy_block4(dst, src, linesize, linesize, 4);

  788.         break;

  789.     case 2: copy_block2(dst, src, linesize, linesize, 2);

  790.         break;

  791.     case 3: *dst = *src;

  792.         break;

  793.     }

  794. }

  795. 

  796. static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al,

  797.                              const uint8_t *mb_bitmask, const AVFrame *reference){

  798.     int i, mb_x, mb_y;

  799.     uint8_t* data[MAX_COMPONENTS];

  800.     const uint8_t *reference_data[MAX_COMPONENTS];

  801.     int linesize[MAX_COMPONENTS];

  802.     GetBitContext mb_bitmask_gb;

  803. 

  804.     if (mb_bitmask) {

  805.         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);

  806.     }

  807. 

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

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

  810.         s->flipped = 0;

  811.     }

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

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

  814.         data[c] = s->picture_ptr->data[c];

  815.         reference_data[c] = reference ? reference->data[c] : NULL;

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

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

  818.         if(s->flipped) {

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

  820.             int offset = (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));

  821.             data[c] += offset;

  822.             reference_data[c] += offset;

  823.             linesize[c] *= -1;

  824.         }

  825.     }

  826. 

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

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

  829.             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);

  830. 

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

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

  833. 

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

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

  836.                 return -1;

  837.             }

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

  839.                 uint8_t *ptr;

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

  841.                 int block_offset;

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

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

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

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

  846.                 x = 0;

  847.                 y = 0;

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

  849.                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +

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

  851. 

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

  853.                         block_offset += linesize[c] >> 1;

  854.                     ptr = data[c] + block_offset;

  855.                     if(!s->progressive) {

  856.                         if (copy_mb) {

  857.                             mjpeg_copy_block(ptr, reference_data[c] + block_offset, linesize[c], s->avctx->lowres);

  858.                         } else {

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

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

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

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

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

  864.                             return -1;

  865.                         }

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

  867.                         }

  868.                     } else {

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

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

  871.                         if(Ah)

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

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

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

  875.                             return -1;

  876.                         }

  877.                     }

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

  879. //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);

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

  881.                         x = 0;

  882.                         y++;

  883.                     }

  884.                 }

  885.             }

  886. 

  887.             if (s->restart_interval && show_bits(&s->gb, 8) == 0xFF){ /* skip RSTn */

  888.                 --s->restart_count;

  889.                 align_get_bits(&s->gb);

  890.                 while(show_bits(&s->gb, 8) == 0xFF)

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

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

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

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

  895.             }

  896.         }

  897.     }

  898.     return 0;

  899. }

  900. 

  901. static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al,

  902.                                             const uint8_t *mb_bitmask, const AVFrame *reference){

  903.     int mb_x, mb_y;

  904.     int EOBRUN = 0;

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

  906.     uint8_t* data = s->picture_ptr->data[c];

  907.     const uint8_t *reference_data = reference ? reference->data[c] : NULL;

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

  909.     int last_scan = 0;

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

  911.     GetBitContext mb_bitmask_gb;

  912. 

  913.     if (mb_bitmask) {

  914.         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);

  915.     }

  916. 

  917.     if(!Al) {

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

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

  920.     }

  921. 

  922.     if(s->interlaced && s->bottom_field) {

  923.         int offset = linesize >> 1;

  924.         data += offset;

  925.         reference_data += offset;

  926.     }

  927. 

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

  929.         int block_offset = (mb_y*linesize*8 >> s->avctx->lowres);

  930.         uint8_t *ptr = data + block_offset;

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

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

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

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

  935.             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);

  936. 

  937.             if (!copy_mb) {

  938.             int ret;

  939.             if(Ah)

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

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

  942.             else

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

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

  945.             if(ret < 0) {

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

  947.                 return -1;

  948.             }

  949.             }

  950. 

  951.             if(last_scan) {

  952.                 if (copy_mb) {

  953.                     mjpeg_copy_block(ptr, reference_data + block_offset, linesize, s->avctx->lowres);

  954.                 } else {

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

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

  957.                 }

  958.             }

  959.         }

  960.     }

  961.     return 0;

  962. }

  963. 

  964. int ff_mjpeg_decode_sos(MJpegDecodeContext *s,

  965.                         const uint8_t *mb_bitmask, const AVFrame *reference)

  966. {

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

  968.     int index, id;

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

  970.     int ilv, prev_shift;

  971. 

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

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

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

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

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

  977.         return -1;

  978.     }

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

  980.     {

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

  982.         return -1;

  983.     }

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

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

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

  987.         /* find component index */

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

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

  990.                 break;

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

  992.         {

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

  994.             return -1;

  995.         }

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

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

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

  999.             index = 3 - i;

  1000. 

  1001.         s->comp_index[i] = index;

  1002. 

  1003.         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1004.         s->h_scount[i] = s->h_count[index];

  1005.         s->v_scount[i] = s->v_count[index];

  1006. 

  1007.         s->dc_index[i] = get_bits(&s->gb, 4);

  1008.         s->ac_index[i] = get_bits(&s->gb, 4);

  1009. 

  1010.         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||

  1011.             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)

  1012.             goto out_of_range;

  1013.         if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)

  1014.             goto out_of_range;

  1015.     }

  1016. 

  1017.     predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */

  1018.     ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */

  1019.     prev_shift = get_bits(&s->gb, 4); /* Ah */

  1020.     point_transform= get_bits(&s->gb, 4); /* Al */

  1021. 

  1022.     for(i=0;i<nb_components;i++)

  1023.         s->last_dc[i] = 1024;

  1024. 

  1025.     if (nb_components > 1) {

  1026.         /* interleaved stream */

  1027.         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);

  1028.         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);

  1029.     } else if(!s->ls) { /* skip this for JPEG-LS */

  1030.         h = s->h_max / s->h_scount[0];

  1031.         v = s->v_max / s->v_scount[0];

  1032.         s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);

  1033.         s->mb_height = (s->height + v * block_size - 1) / (v * block_size);

  1034.         s->nb_blocks[0] = 1;

  1035.         s->h_scount[0] = 1;

  1036.         s->v_scount[0] = 1;

  1037.     }

  1038. 

  1039.     if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1040.         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" : "",

  1041.                predictor, point_transform, ilv, s->bits,

  1042.                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));

  1043. 

  1044. 

  1045.     /* mjpeg-b can have padding bytes between sos and image data, skip them */

  1046.     for (i = s->mjpb_skiptosod; i > 0; i--)

  1047.         skip_bits(&s->gb, 8);

  1048. 

  1049.     if(s->lossless){

  1050.         if(CONFIG_JPEGLS_DECODER && s->ls){

  1051. //            for(){

  1052. //            reset_ls_coding_parameters(s, 0);

  1053. 

  1054.             if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)

  1055.                 return -1;

  1056.         }else{

  1057.             if(s->rgb){

  1058.                 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)

  1059.                     return -1;

  1060.             }else{

  1061.                 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)

  1062.                     return -1;

  1063.             }

  1064.         }

  1065.     }else{

  1066.         if(s->progressive && predictor) {

  1067.             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform,

  1068.                                                 mb_bitmask, reference) < 0)

  1069.                 return -1;

  1070.         } else {

  1071.             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,

  1072.                                  mb_bitmask, reference) < 0)

  1073.                 return -1;

  1074.         }

  1075.     }

  1076.     emms_c();

  1077.     return 0;

  1078.  out_of_range:

  1079.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1080.     return -1;

  1081. }

  1082. 

  1083. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1084. {

  1085.     if (get_bits(&s->gb, 16) != 4)

  1086.         return -1;

  1087.     s->restart_interval = get_bits(&s->gb, 16);

  1088.     s->restart_count = 0;

  1089.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1090. 

  1091.     return 0;

  1092. }

  1093. 

  1094. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1095. {

  1096.     int len, id, i;

  1097. 

  1098.     len = get_bits(&s->gb, 16);

  1099.     if (len < 5)

  1100.         return -1;

  1101.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1102.         return -1;

  1103. 

  1104.     id = get_bits_long(&s->gb, 32);

  1105.     id = av_be2ne32(id);

  1106.     len -= 6;

  1107. 

  1108.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1109.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1110.     }

  1111. 

  1112.     /* buggy AVID, it puts EOI only at every 10th frame */

  1113.     /* also this fourcc is used by non-avid files too, it holds some

  1114.        informations, but it's always present in AVID creates files */

  1115.     if (id == AV_RL32("AVI1"))

  1116.     {

  1117.         /* structure:

  1118.             4bytes      AVI1

  1119.             1bytes      polarity

  1120.             1bytes      always zero

  1121.             4bytes      field_size

  1122.             4bytes      field_size_less_padding

  1123.         */

  1124.             s->buggy_avid = 1;

  1125. //        if (s->first_picture)

  1126. //            printf("mjpeg: workarounding buggy AVID\n");

  1127.         i = get_bits(&s->gb, 8);

  1128.         if     (i==2) s->bottom_field= 1;

  1129.         else if(i==1) s->bottom_field= 0;

  1130. #if 0

  1131.         skip_bits(&s->gb, 8);

  1132.         skip_bits(&s->gb, 32);

  1133.         skip_bits(&s->gb, 32);

  1134.         len -= 10;

  1135. #endif

  1136. //        if (s->interlace_polarity)

  1137. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1138.         goto out;

  1139.     }

  1140. 

  1141. //    len -= 2;

  1142. 

  1143.     if (id == AV_RL32("JFIF"))

  1144.     {

  1145.         int t_w, t_h, v1, v2;

  1146.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1147.         v1= get_bits(&s->gb, 8);

  1148.         v2= get_bits(&s->gb, 8);

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

  1150. 

  1151.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1152.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1153. 

  1154.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1155.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1156.                 v1, v2,

  1157.                 s->avctx->sample_aspect_ratio.num,

  1158.                 s->avctx->sample_aspect_ratio.den

  1159.             );

  1160. 

  1161.         t_w = get_bits(&s->gb, 8);

  1162.         t_h = get_bits(&s->gb, 8);

  1163.         if (t_w && t_h)

  1164.         {

  1165.             /* skip thumbnail */

  1166.             if (len-10-(t_w*t_h*3) > 0)

  1167.                 len -= t_w*t_h*3;

  1168.         }

  1169.         len -= 10;

  1170.         goto out;

  1171.     }

  1172. 

  1173.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1174.     {

  1175.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1176.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1177.         skip_bits(&s->gb, 16); /* version */

  1178.         skip_bits(&s->gb, 16); /* flags0 */

  1179.         skip_bits(&s->gb, 16); /* flags1 */

  1180.         skip_bits(&s->gb, 8);  /* transform */

  1181.         len -= 7;

  1182.         goto out;

  1183.     }

  1184. 

  1185.     if (id == AV_RL32("LJIF")){

  1186.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1187.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

  1188.         skip_bits(&s->gb, 16); /* version ? */

  1189.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1190.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1191.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1192.         switch( get_bits(&s->gb, 8)){

  1193.         case 1:

  1194.             s->rgb= 1;

  1195.             s->pegasus_rct=0;

  1196.             break;

  1197.         case 2:

  1198.             s->rgb= 1;

  1199.             s->pegasus_rct=1;

  1200.             break;

  1201.         default:

  1202.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1203.         }

  1204.         len -= 9;

  1205.         goto out;

  1206.     }

  1207. 

  1208.     /* Apple MJPEG-A */

  1209.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1210.     {

  1211.         id = get_bits_long(&s->gb, 32);

  1212.         id = av_be2ne32(id);

  1213.         len -= 4;

  1214.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1215.         {

  1216. #if 0

  1217.             skip_bits(&s->gb, 32); /* field size */

  1218.             skip_bits(&s->gb, 32); /* pad field size */

  1219.             skip_bits(&s->gb, 32); /* next off */

  1220.             skip_bits(&s->gb, 32); /* quant off */

  1221.             skip_bits(&s->gb, 32); /* huff off */

  1222.             skip_bits(&s->gb, 32); /* image off */

  1223.             skip_bits(&s->gb, 32); /* scan off */

  1224.             skip_bits(&s->gb, 32); /* data off */

  1225. #endif

  1226.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1227.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1228.         }

  1229.     }

  1230. 

  1231. out:

  1232.     /* slow but needed for extreme adobe jpegs */

  1233.     if (len < 0)

  1234.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1235.     while(--len > 0)

  1236.         skip_bits(&s->gb, 8);

  1237. 

  1238.     return 0;

  1239. }

  1240. 

  1241. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1242. {

  1243.     int len = get_bits(&s->gb, 16);

  1244.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1245.         char *cbuf = av_malloc(len - 1);

  1246.         if (cbuf) {

  1247.             int i;

  1248.             for (i = 0; i < len - 2; i++)

  1249.                 cbuf[i] = get_bits(&s->gb, 8);

  1250.             if (i > 0 && cbuf[i-1] == '\n')

  1251.                 cbuf[i-1] = 0;

  1252.             else

  1253.                 cbuf[i] = 0;

  1254. 

  1255.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1256.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1257. 

  1258.             /* buggy avid, it puts EOI only at every 10th frame */

  1259.             if (!strcmp(cbuf, "AVID"))

  1260.             {

  1261.                 s->buggy_avid = 1;

  1262.                 //        if (s->first_picture)

  1263.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1264.             }

  1265.             else if(!strcmp(cbuf, "CS=ITU601")){

  1266.                 s->cs_itu601= 1;

  1267.             }

  1268.             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||

  1269.                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){

  1270.                 s->flipped = 1;

  1271.             }

  1272. 

  1273.             av_free(cbuf);

  1274.         }

  1275.     }

  1276. 

  1277.     return 0;

  1278. }

  1279. 

  1280. /* return the 8 bit start code value and update the search

  1281.    state. Return -1 if no start code found */

  1282. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1283. {

  1284.     const uint8_t *buf_ptr;

  1285.     unsigned int v, v2;

  1286.     int val;

  1287. #ifdef DEBUG

  1288.     int skipped=0;

  1289. #endif

  1290. 

  1291.     buf_ptr = *pbuf_ptr;

  1292.     while (buf_ptr < buf_end) {

  1293.         v = *buf_ptr++;

  1294.         v2 = *buf_ptr;

  1295.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1296.             val = *buf_ptr++;

  1297.             goto found;

  1298.         }

  1299. #ifdef DEBUG

  1300.         skipped++;

  1301. #endif

  1302.     }

  1303.     val = -1;

  1304. found:

  1305.     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);

  1306.     *pbuf_ptr = buf_ptr;

  1307.     return val;

  1308. }

  1309. 

  1310. int ff_mjpeg_find_marker(MJpegDecodeContext *s,

  1311.                          const uint8_t **buf_ptr, const uint8_t *buf_end,

  1312.                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)

  1313. {

  1314.     int start_code;

  1315.     start_code = find_marker(buf_ptr, buf_end);

  1316. 

  1317.                 if ((buf_end - *buf_ptr) > s->buffer_size)

  1318.                 {

  1319.                     av_free(s->buffer);

  1320.                     s->buffer_size = buf_end - *buf_ptr;

  1321.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1322.                     av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1323.                         s->buffer_size);

  1324.                 }

  1325. 

  1326.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1327.                 if (start_code == SOS && !s->ls)

  1328.                 {

  1329.                     const uint8_t *src = *buf_ptr;

  1330.                     uint8_t *dst = s->buffer;

  1331. 

  1332.                     while (src<buf_end)

  1333.                     {

  1334.                         uint8_t x = *(src++);

  1335. 

  1336.                         *(dst++) = x;

  1337.                         if (s->avctx->codec_id != CODEC_ID_THP)

  1338.                         {

  1339.                             if (x == 0xff) {

  1340.                                 while (src < buf_end && x == 0xff)

  1341.                                     x = *(src++);

  1342. 

  1343.                                 if (x >= 0xd0 && x <= 0xd7)

  1344.                                     *(dst++) = x;

  1345.                                 else if (x)

  1346.                                     break;

  1347.                             }

  1348.                         }

  1349.                     }

  1350.                     *unescaped_buf_ptr  = s->buffer;

  1351.                     *unescaped_buf_size = dst - s->buffer;

  1352. 

  1353.                     av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1354.                            (buf_end - *buf_ptr) - (dst - s->buffer));

  1355.                 }

  1356.                 else if(start_code == SOS && s->ls){

  1357.                     const uint8_t *src = *buf_ptr;

  1358.                     uint8_t *dst = s->buffer;

  1359.                     int bit_count = 0;

  1360.                     int t = 0, b = 0;

  1361.                     PutBitContext pb;

  1362. 

  1363.                     s->cur_scan++;

  1364. 

  1365.                     /* find marker */

  1366.                     while (src + t < buf_end){

  1367.                         uint8_t x = src[t++];

  1368.                         if (x == 0xff){

  1369.                             while((src + t < buf_end) && x == 0xff)

  1370.                                 x = src[t++];

  1371.                             if (x & 0x80) {

  1372.                                 t -= 2;

  1373.                                 break;

  1374.                             }

  1375.                         }

  1376.                     }

  1377.                     bit_count = t * 8;

  1378. 

  1379.                     init_put_bits(&pb, dst, t);

  1380. 

  1381.                     /* unescape bitstream */

  1382.                     while(b < t){

  1383.                         uint8_t x = src[b++];

  1384.                         put_bits(&pb, 8, x);

  1385.                         if(x == 0xFF){

  1386.                             x = src[b++];

  1387.                             put_bits(&pb, 7, x);

  1388.                             bit_count--;

  1389.                         }

  1390.                     }

  1391.                     flush_put_bits(&pb);

  1392. 

  1393.                     *unescaped_buf_ptr  = dst;

  1394.                     *unescaped_buf_size = (bit_count + 7) >> 3;

  1395.                 }

  1396.                 else

  1397.                 {

  1398.                     *unescaped_buf_ptr  = *buf_ptr;

  1399.                     *unescaped_buf_size = buf_end - *buf_ptr;

  1400.                 }

  1401. 

  1402.     return start_code;

  1403. }

  1404. 

  1405. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1406.                               void *data, int *data_size,

  1407.                               AVPacket *avpkt)

  1408. {

  1409.     const uint8_t *buf = avpkt->data;

  1410.     int buf_size = avpkt->size;

  1411.     MJpegDecodeContext *s = avctx->priv_data;

  1412.     const uint8_t *buf_end, *buf_ptr;

  1413.     const uint8_t *unescaped_buf_ptr;

  1414.     int unescaped_buf_size;

  1415.     int start_code;

  1416.     AVFrame *picture = data;

  1417. 

  1418.     s->got_picture = 0; // picture from previous image can not be reused

  1419.     buf_ptr = buf;

  1420.     buf_end = buf + buf_size;

  1421.     while (buf_ptr < buf_end) {

  1422.         /* find start next marker */

  1423.         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,

  1424.                                           &unescaped_buf_ptr, &unescaped_buf_size);

  1425.         {

  1426.             /* EOF */

  1427.             if (start_code < 0) {

  1428.                 goto the_end;

  1429.             } else {

  1430.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1431. 

  1432.                 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);

  1433. 

  1434.                 s->start_code = start_code;

  1435.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1436.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1437.                 }

  1438. 

  1439.                 /* process markers */

  1440.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1441.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1442.                     /* APP fields */

  1443.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1444.                     mjpeg_decode_app(s);

  1445.                     /* Comment */

  1446.                 } else if (start_code == COM){

  1447.                     mjpeg_decode_com(s);

  1448.                 }

  1449. 

  1450.                 switch(start_code) {

  1451.                 case SOI:

  1452.                     s->restart_interval = 0;

  1453. 

  1454.                     s->restart_count = 0;

  1455.                     /* nothing to do on SOI */

  1456.                     break;

  1457.                 case DQT:

  1458.                     ff_mjpeg_decode_dqt(s);

  1459.                     break;

  1460.                 case DHT:

  1461.                     if(ff_mjpeg_decode_dht(s) < 0){

  1462.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1463.                         return -1;

  1464.                     }

  1465.                     break;

  1466.                 case SOF0:

  1467.                 case SOF1:

  1468.                     s->lossless=0;

  1469.                     s->ls=0;

  1470.                     s->progressive=0;

  1471.                     if (ff_mjpeg_decode_sof(s) < 0)

  1472.                         return -1;

  1473.                     break;

  1474.                 case SOF2:

  1475.                     s->lossless=0;

  1476.                     s->ls=0;

  1477.                     s->progressive=1;

  1478.                     if (ff_mjpeg_decode_sof(s) < 0)

  1479.                         return -1;

  1480.                     break;

  1481.                 case SOF3:

  1482.                     s->lossless=1;

  1483.                     s->ls=0;

  1484.                     s->progressive=0;

  1485.                     if (ff_mjpeg_decode_sof(s) < 0)

  1486.                         return -1;

  1487.                     break;

  1488.                 case SOF48:

  1489.                     s->lossless=1;

  1490.                     s->ls=1;

  1491.                     s->progressive=0;

  1492.                     if (ff_mjpeg_decode_sof(s) < 0)

  1493.                         return -1;

  1494.                     break;

  1495.                 case LSE:

  1496.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1497.                         return -1;

  1498.                     break;

  1499.                 case EOI:

  1500.                     s->cur_scan = 0;

  1501.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1502.                         break;

  1503. eoi_parser:

  1504.                     if (!s->got_picture) {

  1505.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1506.                         break;

  1507.                     }

  1508.                     if (s->interlaced) {

  1509.                         s->bottom_field ^= 1;

  1510.                         /* if not bottom field, do not output image yet */

  1511.                         if (s->bottom_field == !s->interlace_polarity)

  1512.                             goto not_the_end;

  1513.                     }

  1514.                     *picture = *s->picture_ptr;

  1515.                     *data_size = sizeof(AVFrame);

  1516. 

  1517.                     if(!s->lossless){

  1518.                         picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1519.                         picture->qstride= 0;

  1520.                         picture->qscale_table= s->qscale_table;

  1521.                         memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1522.                         if(avctx->debug & FF_DEBUG_QP)

  1523.                             av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1524.                         picture->quality*= FF_QP2LAMBDA;

  1525.                     }

  1526. 

  1527.                     goto the_end;

  1528.                 case SOS:

  1529.                     if (!s->got_picture) {

  1530.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1531.                         break;

  1532.                     }

  1533.                     if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&

  1534.                         (avctx->err_recognition & AV_EF_EXPLODE))

  1535.                       return AVERROR_INVALIDDATA;

  1536.                     /* buggy avid puts EOI every 10-20th frame */

  1537.                     /* if restart period is over process EOI */

  1538.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1539.                         goto eoi_parser;

  1540.                     break;

  1541.                 case DRI:

  1542.                     mjpeg_decode_dri(s);

  1543.                     break;

  1544.                 case SOF5:

  1545.                 case SOF6:

  1546.                 case SOF7:

  1547.                 case SOF9:

  1548.                 case SOF10:

  1549.                 case SOF11:

  1550.                 case SOF13:

  1551.                 case SOF14:

  1552.                 case SOF15:

  1553.                 case JPG:

  1554.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1555.                     break;

  1556. //                default:

  1557. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1558. //                    break;

  1559.                 }

  1560. 

  1561. not_the_end:

  1562.                 /* eof process start code */

  1563.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1564.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1565.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1566.             }

  1567.         }

  1568.     }

  1569.     if (s->got_picture) {

  1570.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1571.         goto eoi_parser;

  1572.     }

  1573.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1574.     return -1;

  1575. the_end:

  1576.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1577. //    return buf_end - buf_ptr;

  1578.     return buf_ptr - buf;

  1579. }

  1580. 

  1581. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1582. {

  1583.     MJpegDecodeContext *s = avctx->priv_data;

  1584.     int i, j;

  1585. 

  1586.     if (s->picture_ptr && s->picture_ptr->data[0])

  1587.         avctx->release_buffer(avctx, s->picture_ptr);

  1588. 

  1589.     av_free(s->buffer);

  1590.     av_free(s->qscale_table);

  1591.     av_freep(&s->ljpeg_buffer);

  1592.     s->ljpeg_buffer_size=0;

  1593. 

  1594.     for(i=0;i<3;i++) {

  1595.         for(j=0;j<4;j++)

  1596.             free_vlc(&s->vlcs[i][j]);

  1597.     }

  1598.     for(i=0; i<MAX_COMPONENTS; i++) {

  1599.         av_freep(&s->blocks[i]);

  1600.         av_freep(&s->last_nnz[i]);

  1601.     }

  1602.     return 0;

  1603. }

  1604. 

  1605. #define OFFSET(x) offsetof(MJpegDecodeContext, x)

  1606. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1607. static const AVOption options[] = {

  1608.     { "extern_huff",        "Use external huffman table.",  OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },

  1609.     { NULL },

  1610. };

  1611. 

  1612. static const AVClass mjpegdec_class = {

  1613.     .class_name = "MJPEG decoder",

  1614.     .item_name  = av_default_item_name,

  1615.     .option     = options,

  1616.     .version    = LIBAVUTIL_VERSION_INT,

  1617. };

  1618. 

  1619. AVCodec ff_mjpeg_decoder = {

  1620.     .name           = "mjpeg",

  1621.     .type           = AVMEDIA_TYPE_VIDEO,

  1622.     .id             = CODEC_ID_MJPEG,

  1623.     .priv_data_size = sizeof(MJpegDecodeContext),

  1624.     .init           = ff_mjpeg_decode_init,

  1625.     .close          = ff_mjpeg_decode_end,

  1626.     .decode         = ff_mjpeg_decode_frame,

  1627.     .capabilities   = CODEC_CAP_DR1,

  1628.     .max_lowres = 3,

  1629.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1630.     .priv_class     = &mjpegdec_class,

  1631. };

  1632. 

  1633. AVCodec ff_thp_decoder = {

  1634.     .name           = "thp",

  1635.     .type           = AVMEDIA_TYPE_VIDEO,

  1636.     .id             = CODEC_ID_THP,

  1637.     .priv_data_size = sizeof(MJpegDecodeContext),

  1638.     .init           = ff_mjpeg_decode_init,

  1639.     .close          = ff_mjpeg_decode_end,

  1640.     .decode         = ff_mjpeg_decode_frame,

  1641.     .capabilities   = CODEC_CAP_DR1,

  1642.     .max_lowres = 3,

  1643.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1644. };