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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.  * This file is part of FFmpeg.

  8.  *

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

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

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

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

  13.  *

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

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

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

  17.  * Lesser General Public License for more details.

  18.  *

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

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

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

  22.  *

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

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

  25.  *                                  by Alex Beregszaszi

  26.  */

  27. 

  28. /**

  29.  * @file mjpegdec.c

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. //#define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "avcodec.h"

  37. #include "dsputil.h"

  38. #include "mjpeg.h"

  39. #include "jpeglsdec.h"

  40. 

  41. 

  42. static int mjpeg_decode_dht(MJpegDecodeContext *s);

  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 int mjpeg_decode_init(AVCodecContext *avctx)

  67. {

  68.     MJpegDecodeContext *s = avctx->priv_data;

  69. 

  70.     s->avctx = avctx;

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

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

  73.     s->buffer_size = 0;

  74.     s->buffer = NULL;

  75.     s->start_code = -1;

  76.     s->first_picture = 1;

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

  78. 

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

  80.               ff_mjpeg_val_dc_luminance, 12, 0, 0);

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

  82.               ff_mjpeg_val_dc_chrominance, 12, 0, 0);

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

  84.               ff_mjpeg_val_ac_luminance, 251, 0, 1);

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

  86.               ff_mjpeg_val_ac_chrominance, 251, 0, 1);

  87. 

  88.     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)

  89.     {

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

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

  92.         mjpeg_decode_dht(s);

  93.         /* should check for error - but dunno */

  94.     }

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

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

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

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

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

  100.         }

  101.     }

  102. 

  103.     return 0;

  104. }

  105. 

  106. 

  107. /* quantize tables */

  108. static int mjpeg_decode_dqt(MJpegDecodeContext *s)

  109. {

  110.     int len, index, i, j;

  111. 

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

  113. 

  114.     while (len >= 65) {

  115.         /* only 8 bit precision handled */

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

  117.         {

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

  119.             return -1;

  120.         }

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

  122.         if (index >= 4)

  123.             return -1;

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

  125.         /* read quant table */

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

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

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

  129.         }

  130. 

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

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

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

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

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

  136.         len -= 65;

  137.     }

  138. 

  139.     return 0;

  140. }

  141. 

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

  143. static int mjpeg_decode_dht(MJpegDecodeContext *s)

  144. {

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

  146.     uint8_t bits_table[17];

  147.     uint8_t val_table[256];

  148. 

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

  150. 

  151.     while (len > 0) {

  152.         if (len < 17)

  153.             return -1;

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

  155.         if (class >= 2)

  156.             return -1;

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

  158.         if (index >= 4)

  159.             return -1;

  160.         n = 0;

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

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

  163.             n += bits_table[i];

  164.         }

  165.         len -= 17;

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

  167.             return -1;

  168. 

  169.         code_max = 0;

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

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

  172.             if (v > code_max)

  173.                 code_max = v;

  174.             val_table[i] = v;

  175.         }

  176.         len -= n;

  177. 

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

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

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

  181.                class, index, code_max + 1);

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

  183.             return -1;

  184.         }

  185.     }

  186.     return 0;

  187. }

  188. 

  189. static int mjpeg_decode_sof(MJpegDecodeContext *s)

  190. {

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

  192. 

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

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

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

  196. 

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

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

  199. 

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

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

  202.         return -1;

  203.     }

  204. 

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

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

  207. 

  208.     //HACK for odd_height.mov

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

  210.         height= s->height;

  211. 

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

  213.     if(avcodec_check_dimensions(s->avctx, width, height))

  214.         return -1;

  215. 

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

  217.     if (nb_components <= 0 ||

  218.         nb_components > MAX_COMPONENTS)

  219.         return -1;

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

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

  222.         return -1;

  223.     }

  224.     s->nb_components = nb_components;

  225.     s->h_max = 1;

  226.     s->v_max = 1;

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

  228.         /* component id */

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

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

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

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

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

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

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

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

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

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

  239.             return -1;

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

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

  242.     }

  243. 

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

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

  246.         return -1;

  247.     }

  248. 

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

  250. 

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

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

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

  254.         av_freep(&s->qscale_table);

  255. 

  256.         s->width = width;

  257.         s->height = height;

  258.         s->interlaced = 0;

  259. 

  260.         /* test interlaced mode */

  261.         if (s->first_picture &&

  262.             s->org_height != 0 &&

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

  264.             s->interlaced = 1;

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

  266.             s->picture.interlaced_frame = 1;

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

  268.             height *= 2;

  269.         }

  270. 

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

  272. 

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

  274. 

  275.         s->first_picture = 0;

  276.     }

  277. 

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

  279.         return 0;

  280. 

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

  282.     pix_fmt_id = (s->h_count[0] << 20) | (s->v_count[0] << 16) |

  283.                  (s->h_count[1] << 12) | (s->v_count[1] <<  8) |

  284.                  (s->h_count[2] <<  4) |  s->v_count[2];

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

  286.     switch(pix_fmt_id){

  287.     case 0x222222:

  288.     case 0x111111:

  289.         if(s->rgb){

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

  291.         }else if(s->nb_components==3)

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

  293.         else

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

  295.         break;

  296.     case 0x211111:

  297.     case 0x221212:

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

  299.         break;

  300.     default:

  301.     case 0x221111:

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

  303.         break;

  304.     }

  305.     if(s->ls){

  306.         if(s->nb_components > 1)

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

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

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

  310.         else

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

  312.     }

  313. 

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

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

  316. 

  317.     s->picture.reference= 0;

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

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

  320.         return -1;

  321.     }

  322.     s->picture.pict_type= I_TYPE;

  323.     s->picture.key_frame= 1;

  324. 

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

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

  327.     }

  328. 

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

  330. 

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

  332.     {

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

  334.     }

  335. 

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

  337.     if(s->progressive){

  338.         memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);

  339.         memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));

  340.         memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));

  341.     }

  342.     return 0;

  343. }

  344. 

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

  346. {

  347.     int code;

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

  349.     if (code < 0)

  350.     {

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

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

  353.         return 0xffff;

  354.     }

  355. 

  356.     if(code)

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

  358.     else

  359.         return 0;

  360. }

  361. 

  362. /* decode block and dequantize */

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

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

  365. {

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

  367. 

  368.     /* DC coef */

  369.     val = mjpeg_decode_dc(s, dc_index);

  370.     if (val == 0xffff) {

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

  372.         return -1;

  373.     }

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

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

  376.     block[0] = val;

  377.     /* AC coefs */

  378.     i = 0;

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

  380.     for(;;) {

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

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

  383. 

  384.         /* EOB */

  385.         if (code == 0x10)

  386.             break;

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

  388.         if(code != 0x100){

  389.             code &= 0xf;

  390.             if(code > MIN_CACHE_BITS - 16){

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

  392.             }

  393.             {

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

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

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

  397.             }

  398. 

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

  400. 

  401.             if (i >= 63) {

  402.                 if(i == 63){

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

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

  405.                     break;

  406.                 }

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

  408.                 return -1;

  409.             }

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

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

  412.         }

  413.     }

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

  415. 

  416.     return 0;

  417. }

  418. 

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

  420. static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,

  421.                         int component, int dc_index, int ac_index, int16_t *quant_matrix,

  422.                         int ss, int se, int Ah, int Al, int *EOBRUN)

  423. {

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

  425. 

  426.     /* DC coef */

  427.     if(!ss){

  428.         val = mjpeg_decode_dc(s, dc_index);

  429.         if (val == 0xffff) {

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

  431.             return -1;

  432.         }

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

  434.     }else

  435.         val = 0;

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

  437.     block[0] = val;

  438.     if(!se) return 0;

  439.     /* AC coefs */

  440.     if(*EOBRUN){

  441.         (*EOBRUN)--;

  442.         return 0;

  443.     }

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

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

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

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

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

  449.         code -= 16;

  450.         if(code & 0xF) {

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

  452.             code &= 0xf;

  453.             if(code > MIN_CACHE_BITS - 16){

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

  455.             }

  456.             {

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

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

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

  460.             }

  461. 

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

  463. 

  464.             if (i >= se) {

  465.                 if(i == se){

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

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

  468.                     break;

  469.                 }

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

  471.                 return -1;

  472.             }

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

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

  475.         }else{

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

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

  478.                 i += 15;

  479.             }else{

  480.                 val = run;

  481.                 run = (1 << run);

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

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

  484.                 if(val)

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

  486.                 *EOBRUN = run - 1;

  487.                 break;

  488.             }

  489.         }

  490.     }

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

  492. 

  493.     return 0;

  494. }

  495. 

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

  497.     int i, mb_x, mb_y;

  498.     uint16_t buffer[32768][4];

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

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

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

  502. 

  503.     if((unsigned)s->mb_width > 32768) //dynamic alloc

  504.         return -1;

  505. 

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

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

  508.     }

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

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

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

  512. 

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

  514.             ptr += linesize >> 1;

  515. 

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

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

  518.         }

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

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

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

  522. 

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

  524.                 int pred;

  525. 

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

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

  528. 

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

  530. 

  531.                 left[i]=

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

  533.             }

  534. 

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

  536.                 align_get_bits(&s->gb);

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

  538.             }

  539.         }

  540. 

  541.         if(s->rct){

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

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

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

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

  546.             }

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

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

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

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

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

  552.             }

  553.         }else{

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

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

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

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

  558.             }

  559.         }

  560.     }

  561.     return 0;

  562. }

  563. 

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

  565.     int i, mb_x, mb_y;

  566.     const int nb_components=3;

  567. 

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

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

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

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

  572. 

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

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

  575.                     uint8_t *ptr;

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

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

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

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

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

  581.                     x = 0;

  582.                     y = 0;

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

  584. 

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

  586.                         int pred;

  587. 

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

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

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

  591.                                 pred= 128 << point_transform;

  592.                             }else{

  593.                                 pred= ptr[-1];

  594.                             }

  595.                         }else{

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

  597.                                 pred= ptr[-linesize];

  598.                             }else{

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

  600.                             }

  601.                         }

  602. 

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

  604.                             ptr += linesize >> 1;

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

  606. 

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

  608.                             x = 0;

  609.                             y++;

  610.                         }

  611.                     }

  612.                 }

  613.             }else{

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

  615.                     uint8_t *ptr;

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

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

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

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

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

  621.                     x = 0;

  622.                     y = 0;

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

  624. 

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

  626.                         int pred;

  627. 

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

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

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

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

  632.                             x = 0;

  633.                             y++;

  634.                         }

  635.                     }

  636.                 }

  637.             }

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

  639.                 align_get_bits(&s->gb);

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

  641.             }

  642.         }

  643.     }

  644.     return 0;

  645. }

  646. 

  647. static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, int se, int Ah, int Al){

  648.     int i, mb_x, mb_y;

  649.     int EOBRUN = 0;

  650. 

  651.     if(Ah) return 0; /* TODO decode refinement planes too */

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

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

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

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

  656. 

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

  658.                 uint8_t *ptr;

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

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

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

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

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

  664.                 x = 0;

  665.                 y = 0;

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

  667.                     memset(s->block, 0, sizeof(s->block));

  668.                     if (!s->progressive && decode_block(s, s->block, i,

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

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

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

  672.                         return -1;

  673.                     }

  674.                     if (s->progressive && decode_block_progressive(s, s->block, i,

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

  676.                                      s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {

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

  678.                         return -1;

  679.                     }

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

  681.                     ptr = s->picture.data[c] +

  682.                         (((s->linesize[c] * (v * mb_y + y) * 8) +

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

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

  685.                         ptr += s->linesize[c] >> 1;

  686. //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);

  687.                     if(!s->progressive)

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

  689.                     else

  690.                         s->dsp.idct_add(ptr, s->linesize[c], s->block);

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

  692.                         x = 0;

  693.                         y++;

  694.                     }

  695.                 }

  696.             }

  697.             /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */

  698.             if (s->restart_interval && (s->restart_interval < 1350) &&

  699.                 !--s->restart_count) {

  700.                 align_get_bits(&s->gb);

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

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

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

  704.             }

  705.         }

  706.     }

  707.     return 0;

  708. }

  709. 

  710. static int mjpeg_decode_sos(MJpegDecodeContext *s)

  711. {

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

  713.     int vmax, hmax, index, id;

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

  715.     int ilv, prev_shift;

  716. 

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

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

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

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

  721.     {

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

  723.         return -1;

  724.     }

  725.     vmax = 0;

  726.     hmax = 0;

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

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

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

  730.         /* find component index */

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

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

  733.                 break;

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

  735.         {

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

  737.             return -1;

  738.         }

  739. 

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

  741. 

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

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

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

  745. 

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

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

  748. 

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

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

  751.             goto out_of_range;

  752. #if 0 //buggy

  753.         switch(s->start_code)

  754.         {

  755.             case SOF0:

  756.                 if (dc_index[i] > 1 || ac_index[i] > 1)

  757.                     goto out_of_range;

  758.                 break;

  759.             case SOF1:

  760.             case SOF2:

  761.                 if (dc_index[i] > 3 || ac_index[i] > 3)

  762.                     goto out_of_range;

  763.                 break;

  764.             case SOF3:

  765.                 if (dc_index[i] > 3 || ac_index[i] != 0)

  766.                     goto out_of_range;

  767.                 break;

  768.         }

  769. #endif

  770.     }

  771. 

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

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

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

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

  776. 

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

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

  779. 

  780.     if (nb_components > 1) {

  781.         /* interleaved stream */

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

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

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

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

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

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

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

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

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

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

  792.     }

  793. 

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

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

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

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

  798. 

  799. 

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

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

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

  803. 

  804.     if(s->lossless){

  805.         if(s->ls){

  806. //            for(){

  807. //            reset_ls_coding_parameters(s, 0);

  808. 

  809.             ff_jpegls_decode_picture(s, predictor, point_transform, ilv);

  810.         }else{

  811.             if(s->rgb){

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

  813.                     return -1;

  814.             }else{

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

  816.                     return -1;

  817.             }

  818.         }

  819.     }else{

  820.         if(mjpeg_decode_scan(s, nb_components, predictor, ilv, prev_shift, point_transform) < 0)

  821.             return -1;

  822.     }

  823.     emms_c();

  824.     return 0;

  825.  out_of_range:

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

  827.     return -1;

  828. }

  829. 

  830. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  831. {

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

  833.         return -1;

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

  835.     s->restart_count = 0;

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

  837. 

  838.     return 0;

  839. }

  840. 

  841. static int mjpeg_decode_app(MJpegDecodeContext *s)

  842. {

  843.     int len, id, i;

  844. 

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

  846.     if (len < 5)

  847.         return -1;

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

  849.         return -1;

  850. 

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

  852.     id = be2me_32(id);

  853.     len -= 6;

  854. 

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

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

  857.     }

  858. 

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

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

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

  862.     if (id == ff_get_fourcc("AVI1"))

  863.     {

  864.         /* structure:

  865.             4bytes      AVI1

  866.             1bytes      polarity

  867.             1bytes      always zero

  868.             4bytes      field_size

  869.             4bytes      field_size_less_padding

  870.         */

  871.             s->buggy_avid = 1;

  872. //        if (s->first_picture)

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

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

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

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

  877. #if 0

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

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

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

  881.         len -= 10;

  882. #endif

  883. //        if (s->interlace_polarity)

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

  885.         goto out;

  886.     }

  887. 

  888. //    len -= 2;

  889. 

  890.     if (id == ff_get_fourcc("JFIF"))

  891.     {

  892.         int t_w, t_h, v1, v2;

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

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

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

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

  897. 

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

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

  900. 

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

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

  903.                 v1, v2,

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

  905.                 s->avctx->sample_aspect_ratio.den

  906.             );

  907. 

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

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

  910.         if (t_w && t_h)

  911.         {

  912.             /* skip thumbnail */

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

  914.                 len -= t_w*t_h*3;

  915.         }

  916.         len -= 10;

  917.         goto out;

  918.     }

  919. 

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

  921.     {

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

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

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

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

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

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

  928.         len -= 7;

  929.         goto out;

  930.     }

  931. 

  932.     if (id == ff_get_fourcc("LJIF")){

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

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

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

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

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

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

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

  940.         case 1:

  941.             s->rgb= 1;

  942.             s->pegasus_rct=0;

  943.             break;

  944.         case 2:

  945.             s->rgb= 1;

  946.             s->pegasus_rct=1;

  947.             break;

  948.         default:

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

  950.         }

  951.         len -= 9;

  952.         goto out;

  953.     }

  954. 

  955.     /* Apple MJPEG-A */

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

  957.     {

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

  959.         id = be2me_32(id);

  960.         len -= 4;

  961.         if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */

  962.         {

  963. #if 0

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

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

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

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

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

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

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

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

  972. #endif

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

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

  975.         }

  976.     }

  977. 

  978. out:

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

  980.     if (len < 0)

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

  982.     while(--len > 0)

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

  984. 

  985.     return 0;

  986. }

  987. 

  988. static int mjpeg_decode_com(MJpegDecodeContext *s)

  989. {

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

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

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

  993.         if (cbuf) {

  994.             int i;

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

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

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

  998.                 cbuf[i-1] = 0;

  999.             else

  1000.                 cbuf[i] = 0;

  1001. 

  1002.             if(s->avctx->debug & FF_DEBUG_PICT_INFO)

  1003.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1004. 

  1005.             /* buggy avid, it puts EOI only at every 10th frame */

  1006.             if (!strcmp(cbuf, "AVID"))

  1007.             {

  1008.                 s->buggy_avid = 1;

  1009.                 //        if (s->first_picture)

  1010.                 //            printf("mjpeg: workarounding buggy AVID\n");

  1011.             }

  1012.             else if(!strcmp(cbuf, "CS=ITU601")){

  1013.                 s->cs_itu601= 1;

  1014.             }

  1015. 

  1016.             av_free(cbuf);

  1017.         }

  1018.     }

  1019. 

  1020.     return 0;

  1021. }

  1022. 

  1023. #if 0

  1024. static int valid_marker_list[] =

  1025. {

  1026.         /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */

  1027. /* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1028. /* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1029. /* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1030. /* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1031. /* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1032. /* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1033. /* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1034. /* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1035. /* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1036. /* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1037. /* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1038. /* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

  1039. /* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1040. /* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1041. /* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1042. /* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,

  1043. }

  1044. #endif

  1045. 

  1046. /* return the 8 bit start code value and update the search

  1047.    state. Return -1 if no start code found */

  1048. static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)

  1049. {

  1050.     uint8_t *buf_ptr;

  1051.     unsigned int v, v2;

  1052.     int val;

  1053. #ifdef DEBUG

  1054.     int skipped=0;

  1055. #endif

  1056. 

  1057.     buf_ptr = *pbuf_ptr;

  1058.     while (buf_ptr < buf_end) {

  1059.         v = *buf_ptr++;

  1060.         v2 = *buf_ptr;

  1061.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1062.             val = *buf_ptr++;

  1063.             goto found;

  1064.         }

  1065. #ifdef DEBUG

  1066.         skipped++;

  1067. #endif

  1068.     }

  1069.     val = -1;

  1070. found:

  1071. #ifdef DEBUG

  1072.     av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);

  1073. #endif

  1074.     *pbuf_ptr = buf_ptr;

  1075.     return val;

  1076. }

  1077. 

  1078. static int mjpeg_decode_frame(AVCodecContext *avctx,

  1079.                               void *data, int *data_size,

  1080.                               uint8_t *buf, int buf_size)

  1081. {

  1082.     MJpegDecodeContext *s = avctx->priv_data;

  1083.     uint8_t *buf_end, *buf_ptr;

  1084.     int start_code;

  1085.     AVFrame *picture = data;

  1086. 

  1087.     buf_ptr = buf;

  1088.     buf_end = buf + buf_size;

  1089.     while (buf_ptr < buf_end) {

  1090.         /* find start next marker */

  1091.         start_code = find_marker(&buf_ptr, buf_end);

  1092.         {

  1093.             /* EOF */

  1094.             if (start_code < 0) {

  1095.                 goto the_end;

  1096.             } else {

  1097.                 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);

  1098. 

  1099.                 if ((buf_end - buf_ptr) > s->buffer_size)

  1100.                 {

  1101.                     av_free(s->buffer);

  1102.                     s->buffer_size = buf_end-buf_ptr;

  1103.                     s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1104.                     av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",

  1105.                         s->buffer_size);

  1106.                 }

  1107. 

  1108.                 /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1109.                 if (start_code == SOS && !s->ls)

  1110.                 {

  1111.                     uint8_t *src = buf_ptr;

  1112.                     uint8_t *dst = s->buffer;

  1113. 

  1114.                     while (src<buf_end)

  1115.                     {

  1116.                         uint8_t x = *(src++);

  1117. 

  1118.                         *(dst++) = x;

  1119.                         if (avctx->codec_id != CODEC_ID_THP)

  1120.                         {

  1121.                             if (x == 0xff) {

  1122.                                 while (src < buf_end && x == 0xff)

  1123.                                     x = *(src++);

  1124. 

  1125.                                 if (x >= 0xd0 && x <= 0xd7)

  1126.                                     *(dst++) = x;

  1127.                                 else if (x)

  1128.                                     break;

  1129.                             }

  1130.                         }

  1131.                     }

  1132.                     init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);

  1133. 

  1134.                     av_log(avctx, AV_LOG_DEBUG, "escaping removed %d bytes\n",

  1135.                            (buf_end - buf_ptr) - (dst - s->buffer));

  1136.                 }

  1137.                 else if(start_code == SOS && s->ls){

  1138.                     uint8_t *src = buf_ptr;

  1139.                     uint8_t *dst = s->buffer;

  1140.                     int bit_count = 0;

  1141.                     int t = 0, b = 0;

  1142.                     PutBitContext pb;

  1143. 

  1144.                     s->cur_scan++;

  1145. 

  1146.                     /* find marker */

  1147.                     while (src + t < buf_end){

  1148.                         uint8_t x = src[t++];

  1149.                         if (x == 0xff){

  1150.                             while((src + t < buf_end) && x == 0xff)

  1151.                                 x = src[t++];

  1152.                             if (x & 0x80) {

  1153.                                 t -= 2;

  1154.                                 break;

  1155.                             }

  1156.                         }

  1157.                     }

  1158.                     bit_count = t * 8;

  1159. 

  1160.                     init_put_bits(&pb, dst, t);

  1161. 

  1162.                     /* unescape bitstream */

  1163.                     while(b < t){

  1164.                         uint8_t x = src[b++];

  1165.                         put_bits(&pb, 8, x);

  1166.                         if(x == 0xFF){

  1167.                             x = src[b++];

  1168.                             put_bits(&pb, 7, x);

  1169.                             bit_count--;

  1170.                         }

  1171.                     }

  1172.                     flush_put_bits(&pb);

  1173. 

  1174.                     init_get_bits(&s->gb, dst, bit_count);

  1175.                 }

  1176.                 else

  1177.                     init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);

  1178. 

  1179.                 s->start_code = start_code;

  1180.                 if(s->avctx->debug & FF_DEBUG_STARTCODE){

  1181.                     av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1182.                 }

  1183. 

  1184.                 /* process markers */

  1185.                 if (start_code >= 0xd0 && start_code <= 0xd7) {

  1186.                     av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);

  1187.                     /* APP fields */

  1188.                 } else if (start_code >= APP0 && start_code <= APP15) {

  1189.                     mjpeg_decode_app(s);

  1190.                     /* Comment */

  1191.                 } else if (start_code == COM){

  1192.                     mjpeg_decode_com(s);

  1193.                 }

  1194. 

  1195.                 switch(start_code) {

  1196.                 case SOI:

  1197.                     s->restart_interval = 0;

  1198. 

  1199.                     s->restart_count = 0;

  1200.                     /* nothing to do on SOI */

  1201.                     break;

  1202.                 case DQT:

  1203.                     mjpeg_decode_dqt(s);

  1204.                     break;

  1205.                 case DHT:

  1206.                     if(mjpeg_decode_dht(s) < 0){

  1207.                         av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1208.                         return -1;

  1209.                     }

  1210.                     break;

  1211.                 case SOF0:

  1212.                     s->lossless=0;

  1213.                     s->ls=0;

  1214.                     s->progressive=0;

  1215.                     if (mjpeg_decode_sof(s) < 0)

  1216.                         return -1;

  1217.                     break;

  1218.                 case SOF2:

  1219.                     s->lossless=0;

  1220.                     s->ls=0;

  1221.                     s->progressive=1;

  1222.                     if (mjpeg_decode_sof(s) < 0)

  1223.                         return -1;

  1224.                     break;

  1225.                 case SOF3:

  1226.                     s->lossless=1;

  1227.                     s->ls=0;

  1228.                     s->progressive=0;

  1229.                     if (mjpeg_decode_sof(s) < 0)

  1230.                         return -1;

  1231.                     break;

  1232.                 case SOF48:

  1233.                     s->lossless=1;

  1234.                     s->ls=1;

  1235.                     s->progressive=0;

  1236.                     if (mjpeg_decode_sof(s) < 0)

  1237.                         return -1;

  1238.                     break;

  1239.                 case LSE:

  1240.                     if (ff_jpegls_decode_lse(s) < 0)

  1241.                         return -1;

  1242.                     break;

  1243.                 case EOI:

  1244.                     s->cur_scan = 0;

  1245.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1246.                         break;

  1247. eoi_parser:

  1248.                     {

  1249.                         if (s->interlaced) {

  1250.                             s->bottom_field ^= 1;

  1251.                             /* if not bottom field, do not output image yet */

  1252.                             if (s->bottom_field == !s->interlace_polarity)

  1253.                                 goto not_the_end;

  1254.                         }

  1255.                         *picture = s->picture;

  1256.                         *data_size = sizeof(AVFrame);

  1257. 

  1258.                         if(!s->lossless){

  1259.                             picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);

  1260.                             picture->qstride= 0;

  1261.                             picture->qscale_table= s->qscale_table;

  1262.                             memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1263.                             if(avctx->debug & FF_DEBUG_QP)

  1264.                                 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1265.                             picture->quality*= FF_QP2LAMBDA;

  1266.                         }

  1267. 

  1268.                         goto the_end;

  1269.                     }

  1270.                     break;

  1271.                 case SOS:

  1272.                     mjpeg_decode_sos(s);

  1273.                     /* buggy avid puts EOI every 10-20th frame */

  1274.                     /* if restart period is over process EOI */

  1275.                     if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1276.                         goto eoi_parser;

  1277.                     break;

  1278.                 case DRI:

  1279.                     mjpeg_decode_dri(s);

  1280.                     break;

  1281.                 case SOF1:

  1282.                 case SOF5:

  1283.                 case SOF6:

  1284.                 case SOF7:

  1285.                 case SOF9:

  1286.                 case SOF10:

  1287.                 case SOF11:

  1288.                 case SOF13:

  1289.                 case SOF14:

  1290.                 case SOF15:

  1291.                 case JPG:

  1292.                     av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);

  1293.                     break;

  1294. //                default:

  1295. //                    printf("mjpeg: unsupported marker (%x)\n", start_code);

  1296. //                    break;

  1297.                 }

  1298. 

  1299. not_the_end:

  1300.                 /* eof process start code */

  1301.                 buf_ptr += (get_bits_count(&s->gb)+7)/8;

  1302.                 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",

  1303.                        (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));

  1304.             }

  1305.         }

  1306.     }

  1307. the_end:

  1308.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);

  1309. //    return buf_end - buf_ptr;

  1310.     return buf_ptr - buf;

  1311. }

  1312. 

  1313. static int mjpegb_decode_frame(AVCodecContext *avctx,

  1314.                               void *data, int *data_size,

  1315.                               uint8_t *buf, int buf_size)

  1316. {

  1317.     MJpegDecodeContext *s = avctx->priv_data;

  1318.     uint8_t *buf_end, *buf_ptr;

  1319.     AVFrame *picture = data;

  1320.     GetBitContext hgb; /* for the header */

  1321.     uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

  1322.     uint32_t field_size, sod_offs;

  1323. 

  1324.     buf_ptr = buf;

  1325.     buf_end = buf + buf_size;

  1326. 

  1327. read_header:

  1328.     /* reset on every SOI */

  1329.     s->restart_interval = 0;

  1330.     s->restart_count = 0;

  1331.     s->mjpb_skiptosod = 0;

  1332. 

  1333.     init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);

  1334. 

  1335.     skip_bits(&hgb, 32); /* reserved zeros */

  1336. 

  1337.     if (get_bits_long(&hgb, 32) != MKBETAG('m','j','p','g'))

  1338.     {

  1339.         av_log(avctx, AV_LOG_WARNING, "not mjpeg-b (bad fourcc)\n");

  1340.         return 0;

  1341.     }

  1342. 

  1343.     field_size = get_bits_long(&hgb, 32); /* field size */

  1344.     av_log(avctx, AV_LOG_DEBUG, "field size: 0x%x\n", field_size);

  1345.     skip_bits(&hgb, 32); /* padded field size */

  1346.     second_field_offs = get_bits_long(&hgb, 32);

  1347.     av_log(avctx, AV_LOG_DEBUG, "second field offs: 0x%x\n", second_field_offs);

  1348. 

  1349.     dqt_offs = get_bits_long(&hgb, 32);

  1350.     av_log(avctx, AV_LOG_DEBUG, "dqt offs: 0x%x\n", dqt_offs);

  1351.     if (dqt_offs)

  1352.     {

  1353.         init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

  1354.         s->start_code = DQT;

  1355.         mjpeg_decode_dqt(s);

  1356.     }

  1357. 

  1358.     dht_offs = get_bits_long(&hgb, 32);

  1359.     av_log(avctx, AV_LOG_DEBUG, "dht offs: 0x%x\n", dht_offs);

  1360.     if (dht_offs)

  1361.     {

  1362.         init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

  1363.         s->start_code = DHT;

  1364.         mjpeg_decode_dht(s);

  1365.     }

  1366. 

  1367.     sof_offs = get_bits_long(&hgb, 32);

  1368.     av_log(avctx, AV_LOG_DEBUG, "sof offs: 0x%x\n", sof_offs);

  1369.     if (sof_offs)

  1370.     {

  1371.         init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

  1372.         s->start_code = SOF0;

  1373.         if (mjpeg_decode_sof(s) < 0)

  1374.             return -1;

  1375.     }

  1376. 

  1377.     sos_offs = get_bits_long(&hgb, 32);

  1378.     av_log(avctx, AV_LOG_DEBUG, "sos offs: 0x%x\n", sos_offs);

  1379.     sod_offs = get_bits_long(&hgb, 32);

  1380.     av_log(avctx, AV_LOG_DEBUG, "sod offs: 0x%x\n", sod_offs);

  1381.     if (sos_offs)

  1382.     {

  1383. //        init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);

  1384.         init_get_bits(&s->gb, buf+sos_offs, field_size*8);

  1385.         s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));

  1386.         s->start_code = SOS;

  1387.         mjpeg_decode_sos(s);

  1388.     }

  1389. 

  1390.     if (s->interlaced) {

  1391.         s->bottom_field ^= 1;

  1392.         /* if not bottom field, do not output image yet */

  1393.         if (s->bottom_field && second_field_offs)

  1394.         {

  1395.             buf_ptr = buf + second_field_offs;

  1396.             second_field_offs = 0;

  1397.             goto read_header;

  1398.             }

  1399.     }

  1400. 

  1401.     //XXX FIXME factorize, this looks very similar to the EOI code

  1402. 

  1403.     *picture= s->picture;

  1404.     *data_size = sizeof(AVFrame);

  1405. 

  1406.     if(!s->lossless){

  1407.         picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);

  1408.         picture->qstride= 0;

  1409.         picture->qscale_table= s->qscale_table;

  1410.         memset(picture->qscale_table, picture->quality, (s->width+15)/16);

  1411.         if(avctx->debug & FF_DEBUG_QP)

  1412.             av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

  1413.         picture->quality*= FF_QP2LAMBDA;

  1414.     }

  1415. 

  1416.     return buf_ptr - buf;

  1417. }

  1418. 

  1419. #include "sp5x.h"

  1420. 

  1421. static int sp5x_decode_frame(AVCodecContext *avctx,

  1422.                               void *data, int *data_size,

  1423.                               uint8_t *buf, int buf_size)

  1424. {

  1425. #if 0

  1426.     MJpegDecodeContext *s = avctx->priv_data;

  1427. #endif

  1428.     const int qscale = 5;

  1429.     uint8_t *buf_ptr, *buf_end, *recoded;

  1430.     int i = 0, j = 0;

  1431. 

  1432.     if (!avctx->width || !avctx->height)

  1433.         return -1;

  1434. 

  1435.     buf_ptr = buf;

  1436.     buf_end = buf + buf_size;

  1437. 

  1438. #if 1

  1439.     recoded = av_mallocz(buf_size + 1024);

  1440.     if (!recoded)

  1441.         return -1;

  1442. 

  1443.     /* SOI */

  1444.     recoded[j++] = 0xFF;

  1445.     recoded[j++] = 0xD8;

  1446. 

  1447.     memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));

  1448.     memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);

  1449.     memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);

  1450.     j += sizeof(sp5x_data_dqt);

  1451. 

  1452.     memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));

  1453.     j += sizeof(sp5x_data_dht);

  1454. 

  1455.     memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));

  1456.     recoded[j+5] = (avctx->coded_height >> 8) & 0xFF;

  1457.     recoded[j+6] = avctx->coded_height & 0xFF;

  1458.     recoded[j+7] = (avctx->coded_width >> 8) & 0xFF;

  1459.     recoded[j+8] = avctx->coded_width & 0xFF;

  1460.     j += sizeof(sp5x_data_sof);

  1461. 

  1462.     memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));

  1463.     j += sizeof(sp5x_data_sos);

  1464. 

  1465.     for (i = 14; i < buf_size && j < buf_size+1024-2; i++)

  1466.     {

  1467.         recoded[j++] = buf[i];

  1468.         if (buf[i] == 0xff)

  1469.             recoded[j++] = 0;

  1470.     }

  1471. 

  1472.     /* EOI */

  1473.     recoded[j++] = 0xFF;

  1474.     recoded[j++] = 0xD9;

  1475. 

  1476.     i = mjpeg_decode_frame(avctx, data, data_size, recoded, j);

  1477. 

  1478.     av_free(recoded);

  1479. 

  1480. #else

  1481.     /* SOF */

  1482.     s->bits = 8;

  1483.     s->width  = avctx->coded_width;

  1484.     s->height = avctx->coded_height;

  1485.     s->nb_components = 3;

  1486.     s->component_id[0] = 0;

  1487.     s->h_count[0] = 2;

  1488.     s->v_count[0] = 2;

  1489.     s->quant_index[0] = 0;

  1490.     s->component_id[1] = 1;

  1491.     s->h_count[1] = 1;

  1492.     s->v_count[1] = 1;

  1493.     s->quant_index[1] = 1;

  1494.     s->component_id[2] = 2;

  1495.     s->h_count[2] = 1;

  1496.     s->v_count[2] = 1;

  1497.     s->quant_index[2] = 1;

  1498.     s->h_max = 2;

  1499.     s->v_max = 2;

  1500. 

  1501.     s->qscale_table = av_mallocz((s->width+15)/16);

  1502.     avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;

  1503.     s->interlaced = 0;

  1504. 

  1505.     s->picture.reference = 0;

  1506.     if (avctx->get_buffer(avctx, &s->picture) < 0)

  1507.     {

  1508.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1509.         return -1;

  1510.     }

  1511. 

  1512.     s->picture.pict_type = I_TYPE;

  1513.     s->picture.key_frame = 1;

  1514. 

  1515.     for (i = 0; i < 3; i++)

  1516.         s->linesize[i] = s->picture.linesize[i] << s->interlaced;

  1517. 

  1518.     /* DQT */

  1519.     for (i = 0; i < 64; i++)

  1520.     {

  1521.         j = s->scantable.permutated[i];

  1522.         s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];

  1523.     }

  1524.     s->qscale[0] = FFMAX(

  1525.         s->quant_matrixes[0][s->scantable.permutated[1]],

  1526.         s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;

  1527. 

  1528.     for (i = 0; i < 64; i++)

  1529.     {

  1530.         j = s->scantable.permutated[i];

  1531.         s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];

  1532.     }

  1533.     s->qscale[1] = FFMAX(

  1534.         s->quant_matrixes[1][s->scantable.permutated[1]],

  1535.         s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;

  1536. 

  1537.     /* DHT */

  1538. 

  1539.     /* SOS */

  1540.     s->comp_index[0] = 0;

  1541.     s->nb_blocks[0] = s->h_count[0] * s->v_count[0];

  1542.     s->h_scount[0] = s->h_count[0];

  1543.     s->v_scount[0] = s->v_count[0];

  1544.     s->dc_index[0] = 0;

  1545.     s->ac_index[0] = 0;

  1546. 

  1547.     s->comp_index[1] = 1;

  1548.     s->nb_blocks[1] = s->h_count[1] * s->v_count[1];

  1549.     s->h_scount[1] = s->h_count[1];

  1550.     s->v_scount[1] = s->v_count[1];

  1551.     s->dc_index[1] = 1;

  1552.     s->ac_index[1] = 1;

  1553. 

  1554.     s->comp_index[2] = 2;

  1555.     s->nb_blocks[2] = s->h_count[2] * s->v_count[2];

  1556.     s->h_scount[2] = s->h_count[2];

  1557.     s->v_scount[2] = s->v_count[2];

  1558.     s->dc_index[2] = 1;

  1559.     s->ac_index[2] = 1;

  1560. 

  1561.     for (i = 0; i < 3; i++)

  1562.         s->last_dc[i] = 1024;

  1563. 

  1564.     s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);

  1565.     s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);

  1566. 

  1567.     init_get_bits(&s->gb, buf+14, (buf_size-14)*8);

  1568. 

  1569.     return mjpeg_decode_scan(s);

  1570. #endif

  1571. 

  1572.     return i;

  1573. }

  1574. 

  1575. static int mjpeg_decode_end(AVCodecContext *avctx)

  1576. {

  1577.     MJpegDecodeContext *s = avctx->priv_data;

  1578.     int i, j;

  1579. 

  1580.     av_free(s->buffer);

  1581.     av_free(s->qscale_table);

  1582. 

  1583.     for(i=0;i<2;i++) {

  1584.         for(j=0;j<4;j++)

  1585.             free_vlc(&s->vlcs[i][j]);

  1586.     }

  1587.     return 0;

  1588. }

  1589. 

  1590. AVCodec mjpeg_decoder = {

  1591.     "mjpeg",

  1592.     CODEC_TYPE_VIDEO,

  1593.     CODEC_ID_MJPEG,

  1594.     sizeof(MJpegDecodeContext),

  1595.     mjpeg_decode_init,

  1596.     NULL,

  1597.     mjpeg_decode_end,

  1598.     mjpeg_decode_frame,

  1599.     CODEC_CAP_DR1,

  1600.     NULL

  1601. };

  1602. 

  1603. AVCodec thp_decoder = {

  1604.     "thp",

  1605.     CODEC_TYPE_VIDEO,

  1606.     CODEC_ID_THP,

  1607.     sizeof(MJpegDecodeContext),

  1608.     mjpeg_decode_init,

  1609.     NULL,

  1610.     mjpeg_decode_end,

  1611.     mjpeg_decode_frame,

  1612.     CODEC_CAP_DR1,

  1613.     NULL

  1614. };

  1615. 

  1616. AVCodec mjpegb_decoder = {

  1617.     "mjpegb",

  1618.     CODEC_TYPE_VIDEO,

  1619.     CODEC_ID_MJPEGB,

  1620.     sizeof(MJpegDecodeContext),

  1621.     mjpeg_decode_init,

  1622.     NULL,

  1623.     mjpeg_decode_end,

  1624.     mjpegb_decode_frame,

  1625.     CODEC_CAP_DR1,

  1626.     NULL

  1627. };

  1628. 

  1629. AVCodec sp5x_decoder = {

  1630.     "sp5x",

  1631.     CODEC_TYPE_VIDEO,

  1632.     CODEC_ID_SP5X,

  1633.     sizeof(MJpegDecodeContext),

  1634.     mjpeg_decode_init,

  1635.     NULL,

  1636.     mjpeg_decode_end,

  1637.     sp5x_decode_frame,

  1638.     CODEC_CAP_DR1,

  1639.     NULL

  1640. };