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FFmpeg/libavcodec/mjpegdec.c

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  1. /*

  2.  * MJPEG decoder

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

  4.  * Copyright (c) 2003 Alex Beregszaszi

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

  6.  *

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

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

  9.  *                                  by Alex Beregszaszi

  10.  *

  11.  * This file is part of FFmpeg.

  12.  *

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

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

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

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

  17.  *

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

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

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

  21.  * Lesser General Public License for more details.

  22.  *

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

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

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

  26.  */

  27. 

  28. /**

  29.  * @file

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "libavcore/imgutils.h"

  37. #include "avcodec.h"

  38. #include "dsputil.h"

  39. #include "mjpeg.h"

  40. #include "mjpegdec.h"

  41. #include "jpeglsdec.h"

  42. 

  43. 

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

  45.                       int nb_codes, int use_static, int is_ac)

  46. {

  47.     uint8_t huff_size[256+16];

  48.     uint16_t huff_code[256+16];

  49. 

  50.     assert(nb_codes <= 256);

  51. 

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

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

  54. 

  55.     if(is_ac){

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

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

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

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

  60.         nb_codes += 16;

  61.     }

  62. 

  63.     return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 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. }

  76. 

  77. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  78. {

  79.     MJpegDecodeContext *s = avctx->priv_data;

  80. 

  81.     s->avctx = avctx;

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

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

  84.     s->buffer_size = 0;

  85.     s->buffer = NULL;

  86.     s->start_code = -1;

  87.     s->first_picture = 1;

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

  89.     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;

  90. 

  91.     build_basic_mjpeg_vlc(s);

  92. 

  93.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  94.     {

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

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

  97.         if (ff_mjpeg_decode_dht(s)) {

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

  99.             build_basic_mjpeg_vlc(s);

  100.         }

  101.     }

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

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

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

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

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

  107.         }

  108.     }

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

  110.         s->flipped = 1;

  111. 

  112.     return 0;

  113. }

  114. 

  115. 

  116. /* quantize tables */

  117. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  118. {

  119.     int len, index, i, j;

  120. 

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

  122. 

  123.     while (len >= 65) {

  124.         /* only 8 bit precision handled */

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

  126.         {

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

  128.             return -1;

  129.         }

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

  131.         if (index >= 4)

  132.             return -1;

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

  134.         /* read quant table */

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

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

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

  138.         }

  139. 

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

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

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

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

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

  145.         len -= 65;

  146.     }

  147. 

  148.     return 0;

  149. }

  150. 

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

  152. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  153. {

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

  155.     uint8_t bits_table[17];

  156.     uint8_t val_table[256];

  157. 

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

  159. 

  160.     while (len > 0) {

  161.         if (len < 17)

  162.             return -1;

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

  164.         if (class >= 2)

  165.             return -1;

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

  167.         if (index >= 4)

  168.             return -1;

  169.         n = 0;

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

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

  172.             n += bits_table[i];

  173.         }

  174.         len -= 17;

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

  176.             return -1;

  177. 

  178.         code_max = 0;

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

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

  181.             if (v > code_max)

  182.                 code_max = v;

  183.             val_table[i] = v;

  184.         }

  185.         len -= n;

  186. 

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

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

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

  190.                class, index, code_max + 1);

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

  192.             return -1;

  193.         }

  194.     }

  195.     return 0;

  196. }

  197. 

  198. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  199. {

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

  201. 

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

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

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

  205. 

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

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

  208. 

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

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

  211.         return -1;

  212.     }

  213. 

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

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

  216. 

  217.     //HACK for odd_height.mov

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

  219.         height= s->height;

  220. 

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

  222.     if(av_check_image_size(width, height, 0, s->avctx))

  223.         return -1;

  224. 

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

  226.     if (nb_components <= 0 ||

  227.         nb_components > MAX_COMPONENTS)

  228.         return -1;

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

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

  231.         return -1;

  232.     }

  233.     s->nb_components = nb_components;

  234.     s->h_max = 1;

  235.     s->v_max = 1;

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

  237.         /* component id */

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

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

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

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

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

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

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

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

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

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

  248.             return -1;

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

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

  251.     }

  252. 

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

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

  255.         return -1;

  256.     }

  257. 

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

  259. 

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

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

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

  263.         av_freep(&s->qscale_table);

  264. 

  265.         s->width = width;

  266.         s->height = height;

  267.         s->interlaced = 0;

  268. 

  269.         /* test interlaced mode */

  270.         if (s->first_picture &&

  271.             s->org_height != 0 &&

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

  273.             s->interlaced = 1;

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

  275.             s->picture.interlaced_frame = 1;

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

  277.             height *= 2;

  278.         }

  279. 

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

  281. 

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

  283. 

  284.         s->first_picture = 0;

  285.     }

  286. 

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

  288.         return 0;

  289. 

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

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

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

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

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

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

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

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

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

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

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

  301. 

  302.     switch(pix_fmt_id){

  303.     case 0x11111100:

  304.         if(s->rgb){

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

  306.         }else

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

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

  309.         break;

  310.     case 0x11000000:

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

  312.         break;

  313.     case 0x12111100:

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

  315.         break;

  316.     case 0x21111100:

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

  318.         break;

  319.     case 0x22111100:

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

  321.         break;

  322.     default:

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

  324.         return -1;

  325.     }

  326.     if(s->ls){

  327.         if(s->nb_components > 1)

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

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

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

  331.         else

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

  333.     }

  334. 

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

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

  337. 

  338.     s->picture.reference= 0;

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

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

  341.         return -1;

  342.     }

  343.     s->picture.pict_type= FF_I_TYPE;

  344.     s->picture.key_frame= 1;

  345.     s->got_picture = 1;

  346. 

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

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

  349.     }

  350. 

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

  352. 

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

  354.     {

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

  356.     }

  357. 

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

  359.     if(s->progressive){

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

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

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

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

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

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

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

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

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

  369.         }

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

  371.     }

  372.     return 0;

  373. }

  374. 

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

  376. {

  377.     int code;

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

  379.     if (code < 0)

  380.     {

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

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

  383.         return 0xffff;

  384.     }

  385. 

  386.     if(code)

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

  388.     else

  389.         return 0;

  390. }

  391. 

  392. /* decode block and dequantize */

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

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

  395. {

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

  397. 

  398.     /* DC coef */

  399.     val = mjpeg_decode_dc(s, dc_index);

  400.     if (val == 0xffff) {

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

  402.         return -1;

  403.     }

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

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

  406.     block[0] = val;

  407.     /* AC coefs */

  408.     i = 0;

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

  410.     for(;;) {

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

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

  413. 

  414.         /* EOB */

  415.         if (code == 0x10)

  416.             break;

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

  418.         if(code != 0x100){

  419.             code &= 0xf;

  420.             if(code > MIN_CACHE_BITS - 16){

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

  422.             }

  423.             {

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

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

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

  427.             }

  428. 

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

  430. 

  431.             if (i >= 63) {

  432.                 if(i == 63){

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

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

  435.                     break;

  436.                 }

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

  438.                 return -1;

  439.             }

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

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

  442.         }

  443.     }

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

  445. 

  446.     return 0;

  447. }

  448. 

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

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

  451. {

  452.     int val;

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

  454.     val = mjpeg_decode_dc(s, dc_index);

  455.     if (val == 0xffff) {

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

  457.         return -1;

  458.     }

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

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

  461.     block[0] = val;

  462.     return 0;

  463. }

  464. 

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

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

  467.                                     int ac_index, int16_t *quant_matrix,

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

  469. {

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

  471. 

  472.     if(*EOBRUN){

  473.         (*EOBRUN)--;

  474.         return 0;

  475.     }

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

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

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

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

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

  481.         code -= 16;

  482.         if(code & 0xF) {

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

  484.             code &= 0xf;

  485.             if(code > MIN_CACHE_BITS - 16){

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

  487.             }

  488.             {

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

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

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

  492.             }

  493. 

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

  495. 

  496.             if (i >= se) {

  497.                 if(i == se){

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

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

  500.                     break;

  501.                 }

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

  503.                 return -1;

  504.             }

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

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

  507.         }else{

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

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

  510.                 i += 15;

  511.             }else{

  512.                 val = run;

  513.                 run = (1 << run);

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

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

  516.                 if(val)

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

  518.                 *EOBRUN = run - 1;

  519.                 break;

  520.             }

  521.         }

  522.     }

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

  524.     if(i > *last_nnz)

  525.         *last_nnz = i;

  526.     return 0;

  527. }

  528. 

  529. #define REFINE_BIT(j) {\

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

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

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

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

  534. }

  535. 

  536. #define ZERO_RUN \

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

  538.     if(i > last) {\

  539.         i += run;\

  540.         if(i > se) {\

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

  542.             return -1;\

  543.         }\

  544.         break;\

  545.     }\

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

  547.     if(block[j])\

  548.         REFINE_BIT(j)\

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

  550.         break;\

  551. }

  552. 

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

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

  555.                         int ac_index, int16_t *quant_matrix,

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

  557. {

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

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

  560. 

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

  562.     if(*EOBRUN)

  563.         (*EOBRUN)--;

  564.     else {

  565.         for(;;i++) {

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

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

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

  569.             code -= 16;

  570.             if(code & 0xF) {

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

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

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

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

  575.                 ZERO_RUN;

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

  577.                 val--;

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

  579.                 if(i == se) {

  580.                     if(i > *last_nnz)

  581.                         *last_nnz = i;

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

  583.                     return 0;

  584.                 }

  585.             }else{

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

  587.                 if(run == 0xF){

  588.                     ZERO_RUN;

  589.                 }else{

  590.                     val = run;

  591.                     run = (1 << run);

  592.                     if(val) {

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

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

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

  596.                     }

  597.                     *EOBRUN = run - 1;

  598.                     break;

  599.                 }

  600.             }

  601.         }

  602. 

  603.         if(i > *last_nnz)

  604.             *last_nnz = i;

  605.     }

  606. 

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

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

  609.         if(block[j])

  610.             REFINE_BIT(j)

  611.     }

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

  613. 

  614.     return 0;

  615. }

  616. #undef REFINE_BIT

  617. #undef ZERO_RUN

  618. 

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

  620.     int i, mb_x, mb_y;

  621.     uint16_t (*buffer)[4];

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

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

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

  625. 

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

  627.     buffer= s->ljpeg_buffer;

  628. 

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

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

  631.     }

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

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

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

  635. 

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

  637.             ptr += linesize >> 1;

  638. 

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

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

  641.         }

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

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

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

  645. 

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

  647.                 int pred;

  648. 

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

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

  651. 

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

  653. 

  654.                 left[i]=

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

  656.             }

  657. 

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

  659.                 align_get_bits(&s->gb);

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

  661.             }

  662.         }

  663. 

  664.         if(s->rct){

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

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

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

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

  669.             }

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

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

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

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

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

  675.             }

  676.         }else{

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

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

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

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

  681.             }

  682.         }

  683.     }

  684.     return 0;

  685. }

  686. 

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

  688.     int i, mb_x, mb_y;

  689.     const int nb_components=3;

  690. 

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

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

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

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

  695. 

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

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

  698.                     uint8_t *ptr;

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

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

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

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

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

  704.                     x = 0;

  705.                     y = 0;

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

  707. 

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

  709.                         int pred;

  710. 

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

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

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

  714.                                 pred= 128 << point_transform;

  715.                             }else{

  716.                                 pred= ptr[-1];

  717.                             }

  718.                         }else{

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

  720.                                 pred= ptr[-linesize];

  721.                             }else{

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

  723.                             }

  724.                         }

  725. 

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

  727.                             ptr += linesize >> 1;

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

  729. 

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

  731.                             x = 0;

  732.                             y++;

  733.                         }

  734.                     }

  735.                 }

  736.             }else{

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

  738.                     uint8_t *ptr;

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

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

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

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

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

  744.                     x = 0;

  745.                     y = 0;

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

  747. 

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

  749.                         int pred;

  750. 

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

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

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

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

  755.                             x = 0;

  756.                             y++;

  757.                         }

  758.                     }

  759.                 }

  760.             }

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

  762.                 align_get_bits(&s->gb);

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

  764.             }

  765.         }

  766.     }

  767.     return 0;

  768. }

  769. 

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

  771.     int i, mb_x, mb_y;

  772.     uint8_t* data[MAX_COMPONENTS];

  773.     int linesize[MAX_COMPONENTS];

  774. 

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

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

  777.         s->flipped = 0;

  778.     }

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

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

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

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

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

  784.         if(s->flipped) {

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

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

  787.             linesize[c] *= -1;

  788.         }

  789.     }

  790. 

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

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

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

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

  795. 

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

  797.                 uint8_t *ptr;

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

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

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

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

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

  803.                 x = 0;

  804.                 y = 0;

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

  806.                     ptr = data[c] +

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

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

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

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

  811.                     if(!s->progressive) {

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

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

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

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

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

  817.                             return -1;

  818.                         }

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

  820.                     } else {

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

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

  823.                         if(Ah)

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

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

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

  827.                             return -1;

  828.                         }

  829.                     }

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

  831. //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);

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

  833.                         x = 0;

  834.                         y++;

  835.                     }

  836.                 }

  837.             }

  838. 

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

  840.                 align_get_bits(&s->gb);

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

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

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

  844.             }

  845.         }

  846.     }

  847.     return 0;

  848. }

  849. 

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

  851.     int mb_x, mb_y;

  852.     int EOBRUN = 0;

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

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

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

  856.     int last_scan = 0;

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

  858. 

  859.     if(!Al) {

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

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

  862.     }

  863. 

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

  865.         data += linesize >> 1;

  866. 

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

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

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

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

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

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

  873.             int ret;

  874.             if(Ah)

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

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

  877.             else

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

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

  880.             if(ret < 0) {

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

  882.                 return -1;

  883.             }

  884.             if(last_scan) {

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

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

  887.             }

  888.         }

  889.     }

  890.     return 0;

  891. }

  892. 

  893. int ff_mjpeg_decode_sos(MJpegDecodeContext *s)

  894. {

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

  896.     int index, id;

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

  898.     int ilv, prev_shift;

  899. 

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

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

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

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

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

  905.         return -1;

  906.     }

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

  908.     {

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

  910.         return -1;

  911.     }

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

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

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

  915.         /* find component index */

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

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

  918.                 break;

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

  920.         {

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

  922.             return -1;

  923.         }

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

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

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

  927.             index = 3 - i;

  928. 

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

  930. 

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

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

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

  934. 

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

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

  937. 

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

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

  940.             goto out_of_range;

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

  942.             goto out_of_range;

  943.     }

  944. 

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

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

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

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

  949. 

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

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

  952. 

  953.     if (nb_components > 1) {

  954.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  965.     }

  966. 

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

  968.         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" : "",

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

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

  971. 

  972. 

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

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

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

  976. 

  977.     if(s->lossless){

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

  979. //            for(){

  980. //            reset_ls_coding_parameters(s, 0);

  981. 

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

  983.                 return -1;

  984.         }else{

  985.             if(s->rgb){

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

  987.                     return -1;

  988.             }else{

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

  990.                     return -1;

  991.             }

  992.         }

  993.     }else{

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

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

  996.                 return -1;

  997.         } else {

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

  999.                 return -1;

  1000.         }

  1001.     }

  1002.     emms_c();

  1003.     return 0;

  1004.  out_of_range:

  1005.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1006.     return -1;

  1007. }

  1008. 

  1009. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1010. {

  1011.     if (get_bits(&s->gb, 16) != 4)

  1012.         return -1;

  1013.     s->restart_interval = get_bits(&s->gb, 16);

  1014.     s->restart_count = 0;

  1015.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);

  1016. 

  1017.     return 0;

  1018. }

  1019. 

  1020. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1021. {

  1022.     int len, id, i;

  1023. 

  1024.     len = get_bits(&s->gb, 16);

  1025.     if (len < 5)

  1026.         return -1;

  1027.     if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)

  1028.         return -1;

  1029. 

  1030.     id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1031.     id = av_be2ne32(id);

  1032.     len -= 6;

  1033. 

  1034.     if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1035.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1036.     }

  1037. 

  1038.     /* buggy AVID, it puts EOI only at every 10th frame */

  1039.     /* also this fourcc is used by non-avid files too, it holds some

  1040.        informations, but it's always present in AVID creates files */

  1041.     if (id == AV_RL32("AVI1"))

  1042.     {

  1043.         /* structure:

  1044.             4bytes      AVI1

  1045.             1bytes      polarity

  1046.             1bytes      always zero

  1047.             4bytes      field_size

  1048.             4bytes      field_size_less_padding

  1049.         */

  1050.             s->buggy_avid = 1;

  1051. //        if (s->first_picture)

  1052. //            printf("mjpeg: workarounding buggy AVID\n");

  1053.         i = get_bits(&s->gb, 8);

  1054.         if     (i==2) s->bottom_field= 1;

  1055.         else if(i==1) s->bottom_field= 0;

  1056. #if 0

  1057.         skip_bits(&s->gb, 8);

  1058.         skip_bits(&s->gb, 32);

  1059.         skip_bits(&s->gb, 32);

  1060.         len -= 10;

  1061. #endif

  1062. //        if (s->interlace_polarity)

  1063. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1064.         goto out;

  1065.     }

  1066. 

  1067. //    len -= 2;

  1068. 

  1069.     if (id == AV_RL32("JFIF"))

  1070.     {

  1071.         int t_w, t_h, v1, v2;

  1072.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1073.         v1= get_bits(&s->gb, 8);

  1074.         v2= get_bits(&s->gb, 8);

  1075.         skip_bits(&s->gb, 8);

  1076. 

  1077.         s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);

  1078.         s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);

  1079. 

  1080.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1081.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1082.                 v1, v2,

  1083.                 s->avctx->sample_aspect_ratio.num,

  1084.                 s->avctx->sample_aspect_ratio.den

  1085.             );

  1086. 

  1087.         t_w = get_bits(&s->gb, 8);

  1088.         t_h = get_bits(&s->gb, 8);

  1089.         if (t_w && t_h)

  1090.         {

  1091.             /* skip thumbnail */

  1092.             if (len-10-(t_w*t_h*3) > 0)

  1093.                 len -= t_w*t_h*3;

  1094.         }

  1095.         len -= 10;

  1096.         goto out;

  1097.     }

  1098. 

  1099.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))

  1100.     {

  1101.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1102.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1103.         skip_bits(&s->gb, 16); /* version */

  1104.         skip_bits(&s->gb, 16); /* flags0 */

  1105.         skip_bits(&s->gb, 16); /* flags1 */

  1106.         skip_bits(&s->gb, 8);  /* transform */

  1107.         len -= 7;

  1108.         goto out;

  1109.     }

  1110. 

  1111.     if (id == AV_RL32("LJIF")){

  1112.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1113.             av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");

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

  1115.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1116.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1117.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1118.         switch( get_bits(&s->gb, 8)){

  1119.         case 1:

  1120.             s->rgb= 1;

  1121.             s->pegasus_rct=0;

  1122.             break;

  1123.         case 2:

  1124.             s->rgb= 1;

  1125.             s->pegasus_rct=1;

  1126.             break;

  1127.         default:

  1128.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1129.         }

  1130.         len -= 9;

  1131.         goto out;

  1132.     }

  1133. 

  1134.     /* Apple MJPEG-A */

  1135.     if ((s->start_code == APP1) && (len > (0x28 - 8)))

  1136.     {

  1137.         id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);

  1138.         id = av_be2ne32(id);

  1139.         len -= 4;

  1140.         if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */

  1141.         {

  1142. #if 0

  1143.             skip_bits(&s->gb, 32); /* field size */

  1144.             skip_bits(&s->gb, 32); /* pad field size */

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

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

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

  1148.             skip_bits(&s->gb, 32); /* image off */

  1149.             skip_bits(&s->gb, 32); /* scan off */

  1150.             skip_bits(&s->gb, 32); /* data off */

  1151. #endif

  1152.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1153.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1154.         }

  1155.     }

  1156. 

  1157. out:

  1158.     /* slow but needed for extreme adobe jpegs */

  1159.     if (len < 0)

  1160.         av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");

  1161.     while(--len > 0)

  1162.         skip_bits(&s->gb, 8);

  1163. 

  1164.     return 0;

  1165. }

  1166. 

  1167. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1168. {

  1169.     int len = get_bits(&s->gb, 16);

  1170.     if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {

  1171.         char *cbuf = av_malloc(len - 1);

  1172.         if (cbuf) {

  1173.             int i;

  1174.             for (i = 0; i < len - 2; i++)

  1175.                 cbuf[i] = get_bits(&s->gb, 8);

  1176.             if (i > 0 && cbuf[i-1] == '\n')

  1177.                 cbuf[i-1] = 0;

  1178.             else

  1179.                 cbuf[i] = 0;

  1180. 

  1181.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1182.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1183. 

  1184.             /* buggy avid, it puts EOI only at every 10th frame */

  1185.             if (!strcmp(cbuf, "AVID"))

  1186.             {

  1187.                 s->buggy_avid = 1;

  1188.                 //        if (s->first_picture)

  1189.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1190.             }

  1191.             else if(!strcmp(cbuf, "CS=ITU601")){

  1192.                 s->cs_itu601= 1;

  1193.             }

  1194.             else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||

  1195.                     (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){

  1196.                 s->flipped = 1;

  1197.             }

  1198. 

  1199.             av_free(cbuf);

  1200.         }

  1201.     }

  1202. 

  1203.     return 0;

  1204. }

  1205. 

  1206. #if 0

  1207. static int valid_marker_list[] =

  1208. {

  1209.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

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

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

  1212. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1213. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1214. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1215. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1216. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1217. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1218. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1219. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1220. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1221. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1222. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1223. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1224. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1225. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1226. }

  1227. #endif

  1228. 

  1229. /* return the 8 bit start code value and update the search

  1230.    state. Return -1 if no start code found */

  1231. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1232. {

  1233.     const uint8_t *buf_ptr;

  1234.     unsigned int v, v2;

  1235.     int val;

  1236. #ifdef DEBUG

  1237.     int skipped=0;

  1238. #endif

  1239. 

  1240.     buf_ptr = *pbuf_ptr;

  1241.     while (buf_ptr < buf_end) {

  1242.         v = *buf_ptr++;

  1243.         v2 = *buf_ptr;

  1244.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1245.             val = *buf_ptr++;

  1246.             goto found;

  1247.         }

  1248. #ifdef DEBUG

  1249.         skipped++;

  1250. #endif

  1251.     }

  1252.     val = -1;

  1253. found:

  1254.     dprintf(NULL, "find_marker skipped %d bytes\n", skipped);

  1255.     *pbuf_ptr = buf_ptr;

  1256.     return val;

  1257. }

  1258. 

  1259. int ff_mjpeg_decode_frame(AVCodecContext *avctx,

  1260.                               void *data, int *data_size,

  1261.                               AVPacket *avpkt)

  1262. {

  1263.     const uint8_t *buf = avpkt->data;

  1264.     int buf_size = avpkt->size;

  1265.     MJpegDecodeContext *s = avctx->priv_data;

  1266.     const uint8_t *buf_end, *buf_ptr;

  1267.     int start_code;

  1268.     AVFrame *picture = data;

  1269. 

  1270.     s->got_picture = 0; // picture from previous image can not be reused

  1271.     buf_ptr = buf;

  1272.     buf_end = buf + buf_size;

  1273.     while (buf_ptr < buf_end) {

  1274.         /* find start next marker */

  1275.         start_code = find_marker(&buf_ptr, buf_end);

  1276.         {

  1277.             /* EOF */

  1278.             if (start_code < 0) {

  1279.                 goto the_end;

  1280.             } else {

  1281.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);

  1282. 

  1283.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1284.                 {

  1285.                     av_free(s->buffer);

  1286.                     s->buffer_size = buf_end-buf_ptr;

  1287.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1288.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1289.                         s->buffer_size);

  1290.                 }

  1291. 

  1292.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1293.                 if (start_code == SOS && !s->ls)

  1294.                 {

  1295.                     const uint8_t *src = buf_ptr;

  1296.                     uint8_t *dst = s->buffer;

  1297. 

  1298.                     while (src<buf_end)

  1299.                     {

  1300.                         uint8_t x = *(src++);

  1301. 

  1302.                         *(dst++) = x;

  1303.                         if (avctx->codec_id != CODEC_ID_THP)

  1304.                         {

  1305.                             if (x == 0xff) {

  1306.                                 while (src < buf_end && x == 0xff)

  1307.                                     x = *(src++);

  1308. 

  1309.                                 if (x >= 0xd0 && x <= 0xd7)

  1310.                                     *(dst++) = x;

  1311.                                 else if (x)

  1312.                                     break;

  1313.                             }

  1314.                         }

  1315.                     }

  1316.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1317. 

  1318.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1319.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1320.                 }

  1321.                 else if(start_code == SOS && s->ls){

  1322.                     const uint8_t *src = buf_ptr;

  1323.                     uint8_t *dst = s->buffer;

  1324.                     int bit_count = 0;

  1325.                     int t = 0, b = 0;

  1326.                     PutBitContext pb;

  1327. 

  1328.                     s->cur_scan++;

  1329. 

  1330.                     /* find marker */

  1331.                     while (src + t < buf_end){

  1332.                         uint8_t x = src[t++];

  1333.                         if (x == 0xff){

  1334.                             while((src + t < buf_end) && x == 0xff)

  1335.                                 x = src[t++];

  1336.                             if (x & 0x80) {

  1337.                                 t -= 2;

  1338.                                 break;

  1339.                             }

  1340.                         }

  1341.                     }

  1342.                     bit_count = t * 8;

  1343. 

  1344.                     init_put_bits(&pb, dst, t);

  1345. 

  1346.                     /* unescape bitstream */

  1347.                     while(b < t){

  1348.                         uint8_t x = src[b++];

  1349.                         put_bits(&pb, 8, x);

  1350.                         if(x == 0xFF){

  1351.                             x = src[b++];

  1352.                             put_bits(&pb, 7, x);

  1353.                             bit_count--;

  1354.                         }

  1355.                     }

  1356.                     flush_put_bits(&pb);

  1357. 

  1358.                     init_get_bits(&s->gb, dst, bit_count);

  1359.                 }

  1360.                 else

  1361.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1362. 

  1363.                 s->start_code = start_code;

  1364.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1365.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1366.                 }

  1367. 

  1368.                 /* process markers */

  1369.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1370.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1371.                     /* APP fields */

  1372.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1373.                     mjpeg_decode_app(s);

  1374.                     /* Comment */

  1375.                 } else if (start_code == COM){

  1376.                     mjpeg_decode_com(s);

  1377.                 }

  1378. 

  1379.                 switch(start_code) {

  1380.                 case SOI:

  1381.                     s->restart_interval = 0;

  1382. 

  1383.                     s->restart_count = 0;

  1384.                     /* nothing to do on SOI */

  1385.                     break;

  1386.                 case DQT:

  1387.                     ff_mjpeg_decode_dqt(s);

  1388.                     break;

  1389.                 case DHT:

  1390.                     if(ff_mjpeg_decode_dht(s) < 0){

  1391.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1392.                         return -1;

  1393.                     }

  1394.                     break;

  1395.                 case SOF0:

  1396.                 case SOF1:

  1397.                     s->lossless=0;

  1398.                     s->ls=0;

  1399.                     s->progressive=0;

  1400.                     if (ff_mjpeg_decode_sof(s) < 0)

  1401.                         return -1;

  1402.                     break;

  1403.                 case SOF2:

  1404.                     s->lossless=0;

  1405.                     s->ls=0;

  1406.                     s->progressive=1;

  1407.                     if (ff_mjpeg_decode_sof(s) < 0)

  1408.                         return -1;

  1409.                     break;

  1410.                 case SOF3:

  1411.                     s->lossless=1;

  1412.                     s->ls=0;

  1413.                     s->progressive=0;

  1414.                     if (ff_mjpeg_decode_sof(s) < 0)

  1415.                         return -1;

  1416.                     break;

  1417.                 case SOF48:

  1418.                     s->lossless=1;

  1419.                     s->ls=1;

  1420.                     s->progressive=0;

  1421.                     if (ff_mjpeg_decode_sof(s) < 0)

  1422.                         return -1;

  1423.                     break;

  1424.                 case LSE:

  1425.                     if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)

  1426.                         return -1;

  1427.                     break;

  1428.                 case EOI:

  1429.                     s->cur_scan = 0;

  1430.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1431.                         break;

  1432. eoi_parser:

  1433.                     if (!s->got_picture) {

  1434.                         av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");

  1435.                         break;

  1436.                     }

  1437.                     {

  1438.                         if (s->interlaced) {

  1439.                             s->bottom_field ^= 1;

  1440.                             /* if not bottom field, do not output image yet */

  1441.                             if (s->bottom_field == !s->interlace_polarity)

  1442.                                 goto not_the_end;

  1443.                         }

  1444.                         *picture = s->picture;

  1445.                         *data_size = sizeof(AVFrame);

  1446. 

  1447.                         if(!s->lossless){

  1448.                             picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);

  1449.                             picture->qstride= 0;

  1450.                             picture->qscale_table= s->qscale_table;

  1451.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1452.                             if(avctx->debug & FF_DEBUG_QP)

  1453.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1454.                             picture->quality*= FF_QP2LAMBDA;

  1455.                         }

  1456. 

  1457.                         goto the_end;

  1458.                     }

  1459.                     break;

  1460.                 case SOS:

  1461.                     if (!s->got_picture) {

  1462.                         av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");

  1463.                         break;

  1464.                     }

  1465.                     ff_mjpeg_decode_sos(s);

  1466.                     /* buggy avid puts EOI every 10-20th frame */

  1467.                     /* if restart period is over process EOI */

  1468.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1469.                         goto eoi_parser;

  1470.                     break;

  1471.                 case DRI:

  1472.                     mjpeg_decode_dri(s);

  1473.                     break;

  1474.                 case SOF5:

  1475.                 case SOF6:

  1476.                 case SOF7:

  1477.                 case SOF9:

  1478.                 case SOF10:

  1479.                 case SOF11:

  1480.                 case SOF13:

  1481.                 case SOF14:

  1482.                 case SOF15:

  1483.                 case JPG:

  1484.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1485.                     break;

  1486. //                default:

  1487. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1488. //                    break;

  1489.                 }

  1490. 

  1491. not_the_end:

  1492.                 /* eof process start code */

  1493.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1494.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1495.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1496.             }

  1497.         }

  1498.     }

  1499.     if (s->got_picture) {

  1500.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1501.         goto eoi_parser;

  1502.     }

  1503.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1504.     return -1;

  1505. the_end:

  1506.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);

  1507. //    return buf_end - buf_ptr;

  1508.     return buf_ptr - buf;

  1509. }

  1510. 

  1511. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1512. {

  1513.     MJpegDecodeContext *s = avctx->priv_data;

  1514.     int i, j;

  1515. 

  1516.     if (s->picture.data[0])

  1517.         avctx->release_buffer(avctx, &s->picture);

  1518. 

  1519.     av_free(s->buffer);

  1520.     av_free(s->qscale_table);

  1521.     av_freep(&s->ljpeg_buffer);

  1522.     s->ljpeg_buffer_size=0;

  1523. 

  1524.     for(i=0;i<2;i++) {

  1525.         for(j=0;j<4;j++)

  1526.             free_vlc(&s->vlcs[i][j]);

  1527.     }

  1528.     for(i=0; i<MAX_COMPONENTS; i++) {

  1529.         av_freep(&s->blocks[i]);

  1530.         av_freep(&s->last_nnz[i]);

  1531.     }

  1532.     return 0;

  1533. }

  1534. 

  1535. AVCodec mjpeg_decoder = {

  1536.     "mjpeg",

  1537.     AVMEDIA_TYPE_VIDEO,

  1538.     CODEC_ID_MJPEG,

  1539.     sizeof(MJpegDecodeContext),

  1540.     ff_mjpeg_decode_init,

  1541.     NULL,

  1542.     ff_mjpeg_decode_end,

  1543.     ff_mjpeg_decode_frame,

  1544.     CODEC_CAP_DR1,

  1545.     NULL,

  1546.     .max_lowres = 8,

  1547.     .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1548. };

  1549. 

  1550. AVCodec thp_decoder = {

  1551.     "thp",

  1552.     AVMEDIA_TYPE_VIDEO,

  1553.     CODEC_ID_THP,

  1554.     sizeof(MJpegDecodeContext),

  1555.     ff_mjpeg_decode_init,

  1556.     NULL,

  1557.     ff_mjpeg_decode_end,

  1558.     ff_mjpeg_decode_frame,

  1559.     CODEC_CAP_DR1,

  1560.     NULL,

  1561.     .max_lowres = 3,

  1562.     .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1563. };