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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 "libavutil/imgutils.h"

  37. #include "libavutil/avassert.h"

  38. #include "libavutil/opt.h"

  39. #include "avcodec.h"

  40. #include "dsputil.h"

  41. #include "mjpeg.h"

  42. #include "mjpegdec.h"

  43. #include "jpeglsdec.h"

  44. 

  45. 

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

  47.                       int nb_codes, int use_static, int is_ac)

  48. {

  49.     uint8_t huff_size[256];

  50.     uint16_t huff_code[256];

  51.     uint16_t huff_sym[256];

  52.     int i;

  53. 

  54.     assert(nb_codes <= 256);

  55. 

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

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

  58. 

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

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

  61. 

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

  63. 

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

  65. }

  66. 

  67. static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {

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

  69.               ff_mjpeg_val_dc, 12, 0, 0);

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

  71.               ff_mjpeg_val_dc, 12, 0, 0);

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

  73.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

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

  75.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

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

  77.               ff_mjpeg_val_ac_luminance, 251, 0, 0);

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

  79.               ff_mjpeg_val_ac_chrominance, 251, 0, 0);

  80. }

  81. 

  82. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  83. {

  84.     MJpegDecodeContext *s = avctx->priv_data;

  85. 

  86.     if (!s->picture_ptr)

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

  88.     avcodec_get_frame_defaults(&s->picture);

  89. 

  90.     s->avctx = avctx;

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

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

  93.     s->buffer_size = 0;

  94.     s->buffer = NULL;

  95.     s->start_code = -1;

  96.     s->first_picture = 1;

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

  98.     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;

  99. 

  100.     build_basic_mjpeg_vlc(s);

  101. 

  102. #if FF_API_MJPEG_GLOBAL_OPTS

  103.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  104.         s->extern_huff = 1;

  105. #endif

  106.     if (s->extern_huff)

  107.     {

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

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

  110.         if (ff_mjpeg_decode_dht(s)) {

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

  112.             return AVERROR_INVALIDDATA;

  113.         }

  114.     }

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

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

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

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

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

  120.         }

  121.     }

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

  123.         s->flipped = 1;

  124. 

  125.     return 0;

  126. }

  127. 

  128. 

  129. /* quantize tables */

  130. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  131. {

  132.     int len, index, i, j;

  133. 

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

  135. 

  136.     while (len >= 65) {

  137.         /* only 8 bit precision handled */

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

  139.         {

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

  141.             return -1;

  142.         }

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

  144.         if (index >= 4)

  145.             return -1;

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

  147.         /* read quant table */

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

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

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

  151.         }

  152. 

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

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

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

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

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

  158.         len -= 65;

  159.     }

  160. 

  161.     return 0;

  162. }

  163. 

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

  165. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  166. {

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

  168.     uint8_t bits_table[17];

  169.     uint8_t val_table[256];

  170. 

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

  172. 

  173.     while (len > 0) {

  174.         if (len < 17)

  175.             return -1;

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

  177.         if (class >= 2)

  178.             return -1;

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

  180.         if (index >= 4)

  181.             return -1;

  182.         n = 0;

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

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

  185.             n += bits_table[i];

  186.         }

  187.         len -= 17;

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

  189.             return -1;

  190. 

  191.         code_max = 0;

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

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

  194.             if (v > code_max)

  195.                 code_max = v;

  196.             val_table[i] = v;

  197.         }

  198.         len -= n;

  199. 

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

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

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

  203.                class, index, code_max + 1);

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

  205.             return -1;

  206.         }

  207. 

  208.         if(class>0){

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

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

  211.             return -1;

  212.             }

  213.         }

  214.     }

  215.     return 0;

  216. }

  217. 

  218. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  219. {

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

  221. 

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

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

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

  225. 

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

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

  228. 

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

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

  231.         return -1;

  232.     }

  233. 

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

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

  236. 

  237.     //HACK for odd_height.mov

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

  239.         height= s->height;

  240. 

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

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

  243.         return -1;

  244. 

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

  246.     if (nb_components <= 0 ||

  247.         nb_components > MAX_COMPONENTS)

  248.         return -1;

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

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

  251.         return -1;

  252.     }

  253.     s->nb_components = nb_components;

  254.     s->h_max = 1;

  255.     s->v_max = 1;

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

  257.         /* component id */

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

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

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

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

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

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

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

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

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

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

  268.             return -1;

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

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

  271.     }

  272. 

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

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

  275.         return -1;

  276.     }

  277. 

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

  279. 

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

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

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

  283.         av_freep(&s->qscale_table);

  284. 

  285.         s->width = width;

  286.         s->height = height;

  287.         s->interlaced = 0;

  288. 

  289.         /* test interlaced mode */

  290.         if (s->first_picture &&

  291.             s->org_height != 0 &&

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

  293.             s->interlaced = 1;

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

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

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

  297.             height *= 2;

  298.         }

  299. 

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

  301. 

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

  303. 

  304.         s->first_picture = 0;

  305.     }

  306. 

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

  308.         return 0;

  309. 

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

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

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

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

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

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

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

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

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

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

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

  321. 

  322.     switch(pix_fmt_id){

  323.     case 0x11111100:

  324.         if(s->rgb){

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

  326.         }else{

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

  328.             s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;

  329.         }

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

  331.         break;

  332.     case 0x11000000:

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

  334.         break;

  335.     case 0x12111100:

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

  337.         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;

  338.         break;

  339.     case 0x21111100:

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

  341.         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;

  342.         break;

  343.     case 0x22111100:

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

  345.         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;

  346.         break;

  347.     default:

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

  349.         return -1;

  350.     }

  351.     if(s->ls){

  352.         if(s->nb_components > 1)

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

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

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

  356.         else

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

  358.     }

  359. 

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

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

  362. 

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

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

  365.         return -1;

  366.     }

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

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

  369.     s->got_picture = 1;

  370. 

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

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

  373.     }

  374. 

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

  376. 

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

  378.     {

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

  380.     }

  381. 

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

  383.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  393.         }

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

  395.     }

  396.     return 0;

  397. }

  398. 

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

  400. {

  401.     int code;

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

  403.     if (code < 0)

  404.     {

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

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

  407.         return 0xffff;

  408.     }

  409. 

  410.     if(code)

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

  412.     else

  413.         return 0;

  414. }

  415. 

  416. /* decode block and dequantize */

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

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

  419. {

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

  421. 

  422.     /* DC coef */

  423.     val = mjpeg_decode_dc(s, dc_index);

  424.     if (val == 0xffff) {

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

  426.         return -1;

  427.     }

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

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

  430.     block[0] = val;

  431.     /* AC coefs */

  432.     i = 0;

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

  434.     do {

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

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

  437. 

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

  439.             code &= 0xf;

  440.         if(code){

  441.             if(code > MIN_CACHE_BITS - 16){

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

  443.             }

  444.             {

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

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

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

  448.             }

  449. 

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

  451. 

  452.             if (i > 63) {

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

  454.                 return -1;

  455.             }

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

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

  458.         }

  459.     }while(i<63);

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

  461. 

  462.     return 0;

  463. }

  464. 

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

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

  467. {

  468.     int val;

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

  470.     val = mjpeg_decode_dc(s, dc_index);

  471.     if (val == 0xffff) {

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

  473.         return -1;

  474.     }

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

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

  477.     block[0] = val;

  478.     return 0;

  479. }

  480. 

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

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

  483.                                     int ac_index, int16_t *quant_matrix,

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

  485. {

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

  487. 

  488.     if(*EOBRUN){

  489.         (*EOBRUN)--;

  490.         return 0;

  491.     }

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

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

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

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

  496. 

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

  498.         code &= 0xF;

  499.         if(code) {

  500.             i += run;

  501.             if(code > MIN_CACHE_BITS - 16){

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

  503.             }

  504.             {

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

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

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

  508.             }

  509. 

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

  511. 

  512.             if (i >= se) {

  513.                 if(i == se){

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

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

  516.                     break;

  517.                 }

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

  519.                 return -1;

  520.             }

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

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

  523.         }else{

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

  525.                 i += 15;

  526.                 if (i >= se) {

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

  528.                     return -1;

  529.                 }

  530.             }else{

  531.                 val = (1 << run);

  532.                 if(run){

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

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

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

  536.                 }

  537.                 *EOBRUN = val - 1;

  538.                 break;

  539.             }

  540.         }

  541.     }

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

  543.     if(i > *last_nnz)

  544.         *last_nnz = i;

  545.     return 0;

  546. }

  547. 

  548. #define REFINE_BIT(j) {\

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

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

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

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

  553. }

  554. 

  555. #define ZERO_RUN \

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

  557.     if(i > last) {\

  558.         i += run;\

  559.         if(i > se) {\

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

  561.             return -1;\

  562.         }\

  563.         break;\

  564.     }\

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

  566.     if(block[j])\

  567.         REFINE_BIT(j)\

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

  569.         break;\

  570. }

  571. 

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

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

  574.                         int ac_index, int16_t *quant_matrix,

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

  576. {

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

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

  579. 

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

  581.     if(*EOBRUN)

  582.         (*EOBRUN)--;

  583.     else {

  584.         for(;;i++) {

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

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

  587. 

  588.             if(code & 0xF) {

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

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

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

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

  593.                 ZERO_RUN;

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

  595.                 val--;

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

  597.                 if(i == se) {

  598.                     if(i > *last_nnz)

  599.                         *last_nnz = i;

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

  601.                     return 0;

  602.                 }

  603.             }else{

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

  605.                 if(run == 0xF){

  606.                     ZERO_RUN;

  607.                 }else{

  608.                     val = run;

  609.                     run = (1 << run);

  610.                     if(val) {

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

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

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

  614.                     }

  615.                     *EOBRUN = run - 1;

  616.                     break;

  617.                 }

  618.             }

  619.         }

  620. 

  621.         if(i > *last_nnz)

  622.             *last_nnz = i;

  623.     }

  624. 

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

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

  627.         if(block[j])

  628.             REFINE_BIT(j)

  629.     }

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

  631. 

  632.     return 0;

  633. }

  634. #undef REFINE_BIT

  635. #undef ZERO_RUN

  636. 

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

  638.     int i, mb_x, mb_y;

  639.     uint16_t (*buffer)[4];

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

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

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

  643. 

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

  645.     buffer= s->ljpeg_buffer;

  646. 

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

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

  649.     }

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

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

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

  653. 

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

  655.             ptr += linesize >> 1;

  656. 

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

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

  659.         }

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

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

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

  663. 

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

  665.                 int pred;

  666. 

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

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

  669. 

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

  671. 

  672.                 left[i]=

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

  674.             }

  675. 

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

  677.                 align_get_bits(&s->gb);

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

  679.             }

  680.         }

  681. 

  682.         if(s->rct){

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

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

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

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

  687.             }

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

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

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

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

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

  693.             }

  694.         }else{

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

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

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

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

  699.             }

  700.         }

  701.     }

  702.     return 0;

  703. }

  704. 

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

  706.     int i, mb_x, mb_y;

  707.     const int nb_components=3;

  708. 

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

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

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

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

  713. 

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

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

  716.                     uint8_t *ptr;

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

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

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

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

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

  722.                     x = 0;

  723.                     y = 0;

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

  725. 

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

  727.                         int pred;

  728. 

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

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

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

  732.                                 pred= 128 << point_transform;

  733.                             }else{

  734.                                 pred= ptr[-1];

  735.                             }

  736.                         }else{

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

  738.                                 pred= ptr[-linesize];

  739.                             }else{

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

  741.                             }

  742.                         }

  743. 

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

  745.                             ptr += linesize >> 1;

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

  747. 

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

  749.                             x = 0;

  750.                             y++;

  751.                         }

  752.                     }

  753.                 }

  754.             }else{

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

  756.                     uint8_t *ptr;

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

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

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

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

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

  762.                     x = 0;

  763.                     y = 0;

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

  765. 

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

  767.                         int pred;

  768. 

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

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

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

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

  773.                             x = 0;

  774.                             y++;

  775.                         }

  776.                     }

  777.                 }

  778.             }

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

  780.                 align_get_bits(&s->gb);

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

  782.             }

  783.         }

  784.     }

  785.     return 0;

  786. }

  787. 

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

  789.                                               int linesize, int lowres)

  790. {

  791.     switch (lowres) {

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

  793.         break;

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

  795.         break;

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

  797.         break;

  798.     case 3: *dst = *src;

  799.         break;

  800.     }

  801. }

  802. 

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

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

  805.     int i, mb_x, mb_y;

  806.     uint8_t* data[MAX_COMPONENTS];

  807.     const uint8_t *reference_data[MAX_COMPONENTS];

  808.     int linesize[MAX_COMPONENTS];

  809.     GetBitContext mb_bitmask_gb;

  810. 

  811.     if (mb_bitmask) {

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

  813.     }

  814. 

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

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

  817.         s->flipped = 0;

  818.     }

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

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

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

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

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

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

  825.         if(s->flipped) {

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

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

  828.             data[c] += offset;

  829.             reference_data[c] += offset;

  830.             linesize[c] *= -1;

  831.         }

  832.     }

  833. 

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

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

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

  837. 

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

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

  840. 

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

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

  843.                 return -1;

  844.             }

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

  846.                 uint8_t *ptr;

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

  848.                 int block_offset;

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

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

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

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

  853.                 x = 0;

  854.                 y = 0;

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

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

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

  858. 

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

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

  861.                     ptr = data[c] + block_offset;

  862.                     if(!s->progressive) {

  863.                         if (copy_mb) {

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

  865.                         } else {

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

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

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

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

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

  871.                             return -1;

  872.                         }

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

  874.                         }

  875.                     } else {

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

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

  878.                         if(Ah)

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

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

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

  882.                             return -1;

  883.                         }

  884.                     }

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

  886. //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);

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

  888.                         x = 0;

  889.                         y++;

  890.                     }

  891.                 }

  892.             }

  893. 

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

  895.                 --s->restart_count;

  896.                 align_get_bits(&s->gb);

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

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

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

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

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

  902.             }

  903.         }

  904.     }

  905.     return 0;

  906. }

  907. 

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

  909.     int mb_x, mb_y;

  910.     int EOBRUN = 0;

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

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

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

  914.     int last_scan = 0;

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

  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.         data += linesize >> 1;

  924. 

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

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

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

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

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

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

  931.             int ret;

  932.             if(Ah)

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

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

  935.             else

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

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

  938.             if(ret < 0) {

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

  940.                 return -1;

  941.             }

  942.             if(last_scan) {

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

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

  945.             }

  946.         }

  947.     }

  948.     return 0;

  949. }

  950. 

  951. int ff_mjpeg_decode_sos(MJpegDecodeContext *s,

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

  953. {

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

  955.     int index, id;

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

  957.     int ilv, prev_shift;

  958. 

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

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

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

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

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

  964.         return -1;

  965.     }

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

  967.     {

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

  969.         return -1;

  970.     }

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

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

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

  974.         /* find component index */

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

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

  977.                 break;

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

  979.         {

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

  981.             return -1;

  982.         }

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

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

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

  986.             index = 3 - i;

  987. 

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

  989. 

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

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

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

  993. 

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

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

  996. 

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

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

  999.             goto out_of_range;

  1000.         if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)

  1001.             goto out_of_range;

  1002.     }

  1003. 

  1004.     predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */

  1005.     ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */

  1006.     if(s->avctx->codec_tag != AV_RL32("CJPG")){

  1007.         prev_shift = get_bits(&s->gb, 4); /* Ah */

  1008.         point_transform= get_bits(&s->gb, 4); /* Al */

  1009.     }else

  1010.         prev_shift= point_transform= 0;

  1011. 

  1012.     for(i=0;i<nb_components;i++)

  1013.         s->last_dc[i] = 1024;

  1014. 

  1015.     if (nb_components > 1) {

  1016.         /* interleaved stream */

  1017.         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);

  1018.         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);

  1019.     } else if(!s->ls) { /* skip this for JPEG-LS */

  1020.         h = s->h_max / s->h_scount[0];

  1021.         v = s->v_max / s->v_scount[0];

  1022.         s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);

  1023.         s->mb_height = (s->height + v * block_size - 1) / (v * block_size);

  1024.         s->nb_blocks[0] = 1;

  1025.         s->h_scount[0] = 1;

  1026.         s->v_scount[0] = 1;

  1027.     }

  1028. 

  1029.     if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1030.         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",

  1031.                predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,

  1032.                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));

  1033. 

  1034. 

  1035.     /* mjpeg-b can have padding bytes between sos and image data, skip them */

  1036.     for (i = s->mjpb_skiptosod; i > 0; i--)

  1037.         skip_bits(&s->gb, 8);

  1038. 

  1039.     if(s->lossless){

  1040.         av_assert0(s->picture_ptr == &s->picture);

  1041.         if(CONFIG_JPEGLS_DECODER && s->ls){

  1042. //            for(){

  1043. //            reset_ls_coding_parameters(s, 0);

  1044. 

  1045.             if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)

  1046.                 return -1;

  1047.         }else{

  1048.             if(s->rgb){

  1049.                 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)

  1050.                     return -1;

  1051.             }else{

  1052.                 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)

  1053.                     return -1;

  1054.             }

  1055.         }

  1056.     }else{

  1057.         if(s->progressive && predictor) {

  1058.             av_assert0(s->picture_ptr == &s->picture);

  1059.             if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)

  1060.                 return -1;

  1061.         } else {

  1062.             if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,

  1063.                                  mb_bitmask, reference) < 0)

  1064.                 return -1;

  1065.         }

  1066.     }

  1067.     emms_c();

  1068.     return 0;

  1069.  out_of_range:

  1070.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1071.     return -1;

  1072. }

  1073. 

  1074. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1075. {

  1076.     if (get_bits(&s->gb, 16) != 4)

  1077.         return -1;

  1078.     s->restart_interval = get_bits(&s->gb, 16);

  1079.     s->restart_count = 0;

  1080.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1081. 

  1082.     return 0;

  1083. }

  1084. 

  1085. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1086. {

  1087.     int len, id, i;

  1088. 

  1089.     len = get_bits(&s->gb, 16);

  1090.     if (len < 5)

  1091.         return -1;

  1092.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1093.         return -1;

  1094. 

  1095.     id = get_bits_long(&s->gb, 32);

  1096.     id = av_be2ne32(id);

  1097.     len -= 6;

  1098. 

  1099.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1100.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1101.     }

  1102. 

  1103.     /* buggy AVID, it puts EOI only at every 10th frame */

  1104.     /* also this fourcc is used by non-avid files too, it holds some

  1105.        informations, but it's always present in AVID creates files */

  1106.     if (id == AV_RL32("AVI1"))

  1107.     {

  1108.         /* structure:

  1109.             4bytes      AVI1

  1110.             1bytes      polarity

  1111.             1bytes      always zero

  1112.             4bytes      field_size

  1113.             4bytes      field_size_less_padding

  1114.         */

  1115.             s->buggy_avid = 1;

  1116. //        if (s->first_picture)

  1117. //            printf("mjpeg: workarounding buggy AVID\n");

  1118.         i = get_bits(&s->gb, 8);

  1119.         if     (i==2) s->bottom_field= 1;

  1120.         else if(i==1) s->bottom_field= 0;

  1121. #if 0

  1122.         skip_bits(&s->gb, 8);

  1123.         skip_bits(&s->gb, 32);

  1124.         skip_bits(&s->gb, 32);

  1125.         len -= 10;

  1126. #endif

  1127. //        if (s->interlace_polarity)

  1128. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1129.         goto out;

  1130.     }

  1131. 

  1132. //    len -= 2;

  1133. 

  1134.     if (id == AV_RL32("JFIF"))

  1135.     {

  1136.         int t_w, t_h, v1, v2;

  1137.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1138.         v1= get_bits(&s->gb, 8);

  1139.         v2= get_bits(&s->gb, 8);

  1140.         skip_bits(&s->gb, 8);

  1141. 

  1142.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1143.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1144. 

  1145.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1146.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1147.                 v1, v2,

  1148.                 s->avctx->sample_aspect_ratio.num,

  1149.                 s->avctx->sample_aspect_ratio.den

  1150.             );

  1151. 

  1152.         t_w = get_bits(&s->gb, 8);

  1153.         t_h = get_bits(&s->gb, 8);

  1154.         if (t_w && t_h)

  1155.         {

  1156.             /* skip thumbnail */

  1157.             if (len-10-(t_w*t_h*3) > 0)

  1158.                 len -= t_w*t_h*3;

  1159.         }

  1160.         len -= 10;

  1161.         goto out;

  1162.     }

  1163. 

  1164.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1165.     {

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

  1167.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1168.         skip_bits(&s->gb, 16); /* version */

  1169.         skip_bits(&s->gb, 16); /* flags0 */

  1170.         skip_bits(&s->gb, 16); /* flags1 */

  1171.         skip_bits(&s->gb, 8);  /* transform */

  1172.         len -= 7;

  1173.         goto out;

  1174.     }

  1175. 

  1176.     if (id == AV_RL32("LJIF")){

  1177.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1178.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

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

  1180.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1181.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1182.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1183.         switch( get_bits(&s->gb, 8)){

  1184.         case 1:

  1185.             s->rgb= 1;

  1186.             s->pegasus_rct=0;

  1187.             break;

  1188.         case 2:

  1189.             s->rgb= 1;

  1190.             s->pegasus_rct=1;

  1191.             break;

  1192.         default:

  1193.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1194.         }

  1195.         len -= 9;

  1196.         goto out;

  1197.     }

  1198. 

  1199.     /* Apple MJPEG-A */

  1200.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1201.     {

  1202.         id = get_bits_long(&s->gb, 32);

  1203.         id = av_be2ne32(id);

  1204.         len -= 4;

  1205.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1206.         {

  1207. #if 0

  1208.             skip_bits(&s->gb, 32); /* field size */

  1209.             skip_bits(&s->gb, 32); /* pad field size */

  1210.             skip_bits(&s->gb, 32); /* next off */

  1211.             skip_bits(&s->gb, 32); /* quant off */

  1212.             skip_bits(&s->gb, 32); /* huff off */

  1213.             skip_bits(&s->gb, 32); /* image off */

  1214.             skip_bits(&s->gb, 32); /* scan off */

  1215.             skip_bits(&s->gb, 32); /* data off */

  1216. #endif

  1217.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1218.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1219.         }

  1220.     }

  1221. 

  1222. out:

  1223.     /* slow but needed for extreme adobe jpegs */

  1224.     if (len < 0)

  1225.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1226.     while(--len > 0)

  1227.         skip_bits(&s->gb, 8);

  1228. 

  1229.     return 0;

  1230. }

  1231. 

  1232. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1233. {

  1234.     int len = get_bits(&s->gb, 16);

  1235.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1236.         char *cbuf = av_malloc(len - 1);

  1237.         if (cbuf) {

  1238.             int i;

  1239.             for (i = 0; i < len - 2; i++)

  1240.                 cbuf[i] = get_bits(&s->gb, 8);

  1241.             if (i > 0 && cbuf[i-1] == '\n')

  1242.                 cbuf[i-1] = 0;

  1243.             else

  1244.                 cbuf[i] = 0;

  1245. 

  1246.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1247.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1248. 

  1249.             /* buggy avid, it puts EOI only at every 10th frame */

  1250.             if (!strcmp(cbuf, "AVID"))

  1251.             {

  1252.                 s->buggy_avid = 1;

  1253.                 //        if (s->first_picture)

  1254.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1255.             }

  1256.             else if(!strcmp(cbuf, "CS=ITU601")){

  1257.                 s->cs_itu601= 1;

  1258.             }

  1259.             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||

  1260.                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){

  1261.                 s->flipped = 1;

  1262.             }

  1263. 

  1264.             av_free(cbuf);

  1265.         }

  1266.     }

  1267. 

  1268.     return 0;

  1269. }

  1270. 

  1271. /* return the 8 bit start code value and update the search

  1272.    state. Return -1 if no start code found */

  1273. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1274. {

  1275.     const uint8_t *buf_ptr;

  1276.     unsigned int v, v2;

  1277.     int val;

  1278.     int skipped=0;

  1279. 

  1280.     buf_ptr = *pbuf_ptr;

  1281.     while (buf_ptr < buf_end) {

  1282.         v = *buf_ptr++;

  1283.         v2 = *buf_ptr;

  1284.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1285.             val = *buf_ptr++;

  1286.             goto found;

  1287.         }

  1288.         skipped++;

  1289.     }

  1290.     val = -1;

  1291. found:

  1292.     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);

  1293.     *pbuf_ptr = buf_ptr;

  1294.     return val;

  1295. }

  1296. 

  1297. int ff_mjpeg_find_marker(MJpegDecodeContext *s,

  1298.                          const uint8_t **buf_ptr, const uint8_t *buf_end,

  1299.                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)

  1300. {

  1301.     int start_code;

  1302.     start_code = find_marker(buf_ptr, buf_end);

  1303. 

  1304.                 if ((buf_end - *buf_ptr) > s->buffer_size)

  1305.                 {

  1306.                     av_free(s->buffer);

  1307.                     s->buffer_size = buf_end - *buf_ptr;

  1308.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1309.                     av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1310.                         s->buffer_size);

  1311.                 }

  1312. 

  1313.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1314.                 if (start_code == SOS && !s->ls)

  1315.                 {

  1316.                     const uint8_t *src = *buf_ptr;

  1317.                     uint8_t *dst = s->buffer;

  1318. 

  1319.                     while (src<buf_end)

  1320.                     {

  1321.                         uint8_t x = *(src++);

  1322. 

  1323.                         *(dst++) = x;

  1324.                         if (s->avctx->codec_id != CODEC_ID_THP)

  1325.                         {

  1326.                             if (x == 0xff) {

  1327.                                 while (src < buf_end && x == 0xff)

  1328.                                     x = *(src++);

  1329. 

  1330.                                 if (x >= 0xd0 && x <= 0xd7)

  1331.                                     *(dst++) = x;

  1332.                                 else if (x)

  1333.                                     break;

  1334.                             }

  1335.                         }

  1336.                     }

  1337.                     *unescaped_buf_ptr  = s->buffer;

  1338.                     *unescaped_buf_size = dst - s->buffer;

  1339. 

  1340.                     av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1341.                            (buf_end - *buf_ptr) - (dst - s->buffer));

  1342.                 }

  1343.                 else if(start_code == SOS && s->ls){

  1344.                     const uint8_t *src = *buf_ptr;

  1345.                     uint8_t *dst = s->buffer;

  1346.                     int bit_count = 0;

  1347.                     int t = 0, b = 0;

  1348.                     PutBitContext pb;

  1349. 

  1350.                     s->cur_scan++;

  1351. 

  1352.                     /* find marker */

  1353.                     while (src + t < buf_end){

  1354.                         uint8_t x = src[t++];

  1355.                         if (x == 0xff){

  1356.                             while((src + t < buf_end) && x == 0xff)

  1357.                                 x = src[t++];

  1358.                             if (x & 0x80) {

  1359.                                 t -= 2;

  1360.                                 break;

  1361.                             }

  1362.                         }

  1363.                     }

  1364.                     bit_count = t * 8;

  1365. 

  1366.                     init_put_bits(&pb, dst, t);

  1367. 

  1368.                     /* unescape bitstream */

  1369.                     while(b < t){

  1370.                         uint8_t x = src[b++];

  1371.                         put_bits(&pb, 8, x);

  1372.                         if(x == 0xFF){

  1373.                             x = src[b++];

  1374.                             put_bits(&pb, 7, x);

  1375.                             bit_count--;

  1376.                         }

  1377.                     }

  1378.                     flush_put_bits(&pb);

  1379. 

  1380.                     *unescaped_buf_ptr  = dst;

  1381.                     *unescaped_buf_size = (bit_count + 7) >> 3;

  1382.                 }

  1383.                 else

  1384.                 {

  1385.                     *unescaped_buf_ptr  = *buf_ptr;

  1386.                     *unescaped_buf_size = buf_end - *buf_ptr;

  1387.                 }

  1388. 

  1389.     return start_code;

  1390. }

  1391. 

  1392. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1393.                               void *data, int *data_size,

  1394.                               AVPacket *avpkt)

  1395. {

  1396.     const uint8_t *buf = avpkt->data;

  1397.     int buf_size = avpkt->size;

  1398.     MJpegDecodeContext *s = avctx->priv_data;

  1399.     const uint8_t *buf_end, *buf_ptr;

  1400.     const uint8_t *unescaped_buf_ptr;

  1401.     int unescaped_buf_size;

  1402.     int start_code;

  1403.     AVFrame *picture = data;

  1404. 

  1405.     s->got_picture = 0; // picture from previous image can not be reused

  1406.     buf_ptr = buf;

  1407.     buf_end = buf + buf_size;

  1408.     while (buf_ptr < buf_end) {

  1409.         /* find start next marker */

  1410.         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,

  1411.                                           &unescaped_buf_ptr, &unescaped_buf_size);

  1412.         {

  1413.             /* EOF */

  1414.             if (start_code < 0) {

  1415.                 goto the_end;

  1416.             } else {

  1417.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1418. 

  1419.                 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);

  1420. 

  1421.                 s->start_code = start_code;

  1422.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1423.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1424.                 }

  1425. 

  1426.                 /* process markers */

  1427.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1428.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1429.                     /* APP fields */

  1430.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1431.                     mjpeg_decode_app(s);

  1432.                     /* Comment */

  1433.                 } else if (start_code == COM){

  1434.                     mjpeg_decode_com(s);

  1435.                 }

  1436. 

  1437.                 switch(start_code) {

  1438.                 case SOI:

  1439.                     s->restart_interval = 0;

  1440. 

  1441.                     s->restart_count = 0;

  1442.                     /* nothing to do on SOI */

  1443.                     break;

  1444.                 case DQT:

  1445.                     ff_mjpeg_decode_dqt(s);

  1446.                     break;

  1447.                 case DHT:

  1448.                     if(ff_mjpeg_decode_dht(s) < 0){

  1449.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1450.                         return -1;

  1451.                     }

  1452.                     break;

  1453.                 case SOF0:

  1454.                 case SOF1:

  1455.                     s->lossless=0;

  1456.                     s->ls=0;

  1457.                     s->progressive=0;

  1458.                     if (ff_mjpeg_decode_sof(s) < 0)

  1459.                         return -1;

  1460.                     break;

  1461.                 case SOF2:

  1462.                     s->lossless=0;

  1463.                     s->ls=0;

  1464.                     s->progressive=1;

  1465.                     if (ff_mjpeg_decode_sof(s) < 0)

  1466.                         return -1;

  1467.                     break;

  1468.                 case SOF3:

  1469.                     s->lossless=1;

  1470.                     s->ls=0;

  1471.                     s->progressive=0;

  1472.                     if (ff_mjpeg_decode_sof(s) < 0)

  1473.                         return -1;

  1474.                     break;

  1475.                 case SOF48:

  1476.                     s->lossless=1;

  1477.                     s->ls=1;

  1478.                     s->progressive=0;

  1479.                     if (ff_mjpeg_decode_sof(s) < 0)

  1480.                         return -1;

  1481.                     break;

  1482.                 case LSE:

  1483.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1484.                         return -1;

  1485.                     break;

  1486.                 case EOI:

  1487.                     s->cur_scan = 0;

  1488.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1489.                         break;

  1490. eoi_parser:

  1491.                     if (!s->got_picture) {

  1492.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1493.                         break;

  1494.                     }

  1495.                     if (s->interlaced) {

  1496.                         s->bottom_field ^= 1;

  1497.                         /* if not bottom field, do not output image yet */

  1498.                         if (s->bottom_field == !s->interlace_polarity)

  1499.                             break;

  1500.                     }

  1501.                     *picture = *s->picture_ptr;

  1502.                     *data_size = sizeof(AVFrame);

  1503. 

  1504.                     if(!s->lossless){

  1505.                         picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1506.                         picture->qstride= 0;

  1507.                         picture->qscale_table= s->qscale_table;

  1508.                         memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1509.                         if(avctx->debug & FF_DEBUG_QP)

  1510.                             av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1511.                         picture->quality*= FF_QP2LAMBDA;

  1512.                     }

  1513. 

  1514.                     goto the_end;

  1515.                 case SOS:

  1516.                     if (!s->got_picture) {

  1517.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1518.                         break;

  1519.                     }

  1520.                     if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&

  1521.                         avctx->error_recognition >= FF_ER_EXPLODE)

  1522.                       return AVERROR_INVALIDDATA;

  1523.                     /* buggy avid puts EOI every 10-20th frame */

  1524.                     /* if restart period is over process EOI */

  1525.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1526.                         goto eoi_parser;

  1527.                     break;

  1528.                 case DRI:

  1529.                     mjpeg_decode_dri(s);

  1530.                     break;

  1531.                 case SOF5:

  1532.                 case SOF6:

  1533.                 case SOF7:

  1534.                 case SOF9:

  1535.                 case SOF10:

  1536.                 case SOF11:

  1537.                 case SOF13:

  1538.                 case SOF14:

  1539.                 case SOF15:

  1540.                 case JPG:

  1541.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1542.                     break;

  1543. //                default:

  1544. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1545. //                    break;

  1546.                 }

  1547. 

  1548.                 /* eof process start code */

  1549.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1550.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1551.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1552.             }

  1553.         }

  1554.     }

  1555.     if (s->got_picture) {

  1556.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1557.         goto eoi_parser;

  1558.     }

  1559.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1560.     return -1;

  1561. the_end:

  1562.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1563. //    return buf_end - buf_ptr;

  1564.     return buf_ptr - buf;

  1565. }

  1566. 

  1567. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1568. {

  1569.     MJpegDecodeContext *s = avctx->priv_data;

  1570.     int i, j;

  1571. 

  1572.     if (s->picture_ptr && s->picture_ptr->data[0])

  1573.         avctx->release_buffer(avctx, s->picture_ptr);

  1574. 

  1575.     av_free(s->buffer);

  1576.     av_free(s->qscale_table);

  1577.     av_freep(&s->ljpeg_buffer);

  1578.     s->ljpeg_buffer_size=0;

  1579. 

  1580.     for(i=0;i<3;i++) {

  1581.         for(j=0;j<4;j++)

  1582.             free_vlc(&s->vlcs[i][j]);

  1583.     }

  1584.     for(i=0; i<MAX_COMPONENTS; i++) {

  1585.         av_freep(&s->blocks[i]);

  1586.         av_freep(&s->last_nnz[i]);

  1587.     }

  1588.     return 0;

  1589. }

  1590. 

  1591. #define OFFSET(x) offsetof(MJpegDecodeContext, x)

  1592. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1593. static const AVOption options[] = {

  1594.     { "extern_huff",        "Use external huffman table.",  OFFSET(extern_huff), FF_OPT_TYPE_INT, { 0 }, 0, 1, VD },

  1595.     { NULL },

  1596. };

  1597. 

  1598. static const AVClass mjpegdec_class = {

  1599.     .class_name = "MJPEG decoder",

  1600.     .item_name  = av_default_item_name,

  1601.     .option     = options,

  1602.     .version    = LIBAVUTIL_VERSION_INT,

  1603. };

  1604. 

  1605. AVCodec ff_mjpeg_decoder = {

  1606.     .name           = "mjpeg",

  1607.     .type           = AVMEDIA_TYPE_VIDEO,

  1608.     .id             = CODEC_ID_MJPEG,

  1609.     .priv_data_size = sizeof(MJpegDecodeContext),

  1610.     .init           = ff_mjpeg_decode_init,

  1611.     .close          = ff_mjpeg_decode_end,

  1612.     .decode         = ff_mjpeg_decode_frame,

  1613.     .capabilities   = CODEC_CAP_DR1,

  1614.     .max_lowres = 3,

  1615.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1616.     .priv_class     = &mjpegdec_class,

  1617. };

  1618. 

  1619. AVCodec ff_thp_decoder = {

  1620.     .name           = "thp",

  1621.     .type           = AVMEDIA_TYPE_VIDEO,

  1622.     .id             = CODEC_ID_THP,

  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("Nintendo Gamecube THP video"),

  1630. };