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FFmpeg/libavcodec/mjpegdec.c

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  1. /*

  2.  * MJPEG decoder

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

  4.  * Copyright (c) 2003 Alex Beregszaszi

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

  6.  *

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

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

  9.  *                                  by Alex Beregszaszi

  10.  *

  11.  * This file is part of Libav.

  12.  *

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

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

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

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

  17.  *

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

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

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

  21.  * Lesser General Public License for more details.

  22.  *

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

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

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

  26.  */

  27. 

  28. /**

  29.  * @file

  30.  * MJPEG decoder.

  31.  */

  32. 

  33. // #define DEBUG

  34. #include <assert.h>

  35. 

  36. #include "libavutil/imgutils.h"

  37. #include "libavutil/opt.h"

  38. #include "avcodec.h"

  39. #include "dsputil.h"

  40. #include "mjpeg.h"

  41. #include "mjpegdec.h"

  42. #include "jpeglsdec.h"

  43. 

  44. 

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

  46.                      const uint8_t *val_table, int nb_codes,

  47.                      int use_static, int is_ac)

  48. {

  49.     uint8_t huff_size[256] = { 0 };

  50.     uint16_t huff_code[256];

  51.     uint16_t huff_sym[256];

  52.     int i;

  53. 

  54.     assert(nb_codes <= 256);

  55. 

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

  57. 

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

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

  60. 

  61.     if (is_ac)

  62.         huff_sym[0] = 16 * 256;

  63. 

  64.     return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,

  65.                               huff_code, 2, 2, huff_sym, 2, 2, use_static);

  66. }

  67. 

  68. static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)

  69. {

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

  71.               avpriv_mjpeg_val_dc, 12, 0, 0);

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

  73.               avpriv_mjpeg_val_dc, 12, 0, 0);

  74.     build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,

  75.               avpriv_mjpeg_val_ac_luminance, 251, 0, 1);

  76.     build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,

  77.               avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);

  78.     build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,

  79.               avpriv_mjpeg_val_ac_luminance, 251, 0, 0);

  80.     build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,

  81.               avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);

  82. }

  83. 

  84. av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)

  85. {

  86.     MJpegDecodeContext *s = avctx->priv_data;

  87. 

  88.     if (!s->picture_ptr)

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

  90. 

  91.     s->avctx = avctx;

  92.     ff_dsputil_init(&s->dsp, avctx);

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

  94.     s->buffer_size   = 0;

  95.     s->buffer        = NULL;

  96.     s->start_code    = -1;

  97.     s->first_picture = 1;

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

  99.     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;

  100. 

  101.     build_basic_mjpeg_vlc(s);

  102. 

  103.     if (s->extern_huff) {

  104.         int ret;

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

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

  107.         if ((ret = ff_mjpeg_decode_dht(s))) {

  108.             av_log(avctx, AV_LOG_ERROR,

  109.                    "mjpeg: error using external huffman table\n");

  110.             return ret;

  111.         }

  112.     }

  113.     if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */

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

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

  116.     }

  117.     if (avctx->codec->id == AV_CODEC_ID_AMV)

  118.         s->flipped = 1;

  119. 

  120.     return 0;

  121. }

  122. 

  123. 

  124. /* quantize tables */

  125. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)

  126. {

  127.     int len, index, i, j;

  128. 

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

  130. 

  131.     while (len >= 65) {

  132.         /* only 8 bit precision handled */

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

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

  135.             return -1;

  136.         }

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

  138.         if (index >= 4)

  139.             return -1;

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

  141.         /* read quant table */

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

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

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

  145.         }

  146. 

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

  148.         s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],

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

  150.         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",

  151.                index, s->qscale[index]);

  152.         len -= 65;

  153.     }

  154.     return 0;

  155. }

  156. 

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

  158. int ff_mjpeg_decode_dht(MJpegDecodeContext *s)

  159. {

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

  161.     uint8_t bits_table[17];

  162.     uint8_t val_table[256];

  163.     int ret = 0;

  164. 

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

  166. 

  167.     while (len > 0) {

  168.         if (len < 17)

  169.             return AVERROR_INVALIDDATA;

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

  171.         if (class >= 2)

  172.             return AVERROR_INVALIDDATA;

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

  174.         if (index >= 4)

  175.             return AVERROR_INVALIDDATA;

  176.         n = 0;

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

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

  179.             n += bits_table[i];

  180.         }

  181.         len -= 17;

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

  183.             return AVERROR_INVALIDDATA;

  184. 

  185.         code_max = 0;

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

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

  188.             if (v > code_max)

  189.                 code_max = v;

  190.             val_table[i] = v;

  191.         }

  192.         len -= n;

  193. 

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

  195.         ff_free_vlc(&s->vlcs[class][index]);

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

  197.                class, index, code_max + 1);

  198.         if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,

  199.                              code_max + 1, 0, class > 0)) < 0)

  200.             return ret;

  201. 

  202.         if (class > 0) {

  203.             ff_free_vlc(&s->vlcs[2][index]);

  204.             if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,

  205.                                  code_max + 1, 0, 0)) < 0)

  206.                 return ret;

  207.         }

  208.     }

  209.     return 0;

  210. }

  211. 

  212. int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

  213. {

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

  215. 

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

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

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

  219. 

  220.     if (s->pegasus_rct)

  221.         s->bits = 9;

  222.     if (s->bits == 9 && !s->pegasus_rct)

  223.         s->rct  = 1;    // FIXME ugly

  224. 

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

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

  227.         return -1;

  228.     }

  229. 

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

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

  232. 

  233.     // HACK for odd_height.mov

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

  235.         height= s->height;

  236. 

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

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

  239.         return AVERROR_INVALIDDATA;

  240. 

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

  242.     if (nb_components <= 0 ||

  243.         nb_components > MAX_COMPONENTS)

  244.         return -1;

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

  246.         av_log_missing_feature(s->avctx,

  247.                                "only <= 8 bits/component or "

  248.                                "16-bit gray accepted for JPEG-LS\n", 0);

  249.         return AVERROR_PATCHWELCOME;

  250.     }

  251.     s->nb_components = nb_components;

  252.     s->h_max         = 1;

  253.     s->v_max         = 1;

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

  255.         /* component id */

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

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

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

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

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

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

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

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

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

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

  266.             return AVERROR_INVALIDDATA;

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

  268.                i, s->h_count[i], s->v_count[i],

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

  270.     }

  271. 

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

  273.         av_log_missing_feature(s->avctx,

  274.                                "Subsampling in JPEG-LS is not supported.\n", 0);

  275.         return AVERROR_PATCHWELCOME;

  276.     }

  277. 

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

  279.         s->rgb = 1;

  280. 

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

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

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

  284.         av_freep(&s->qscale_table);

  285. 

  286.         s->width      = width;

  287.         s->height     = height;

  288.         s->interlaced = 0;

  289. 

  290.         /* test interlaced mode */

  291.         if (s->first_picture   &&

  292.             s->org_height != 0 &&

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

  294.             s->interlaced                    = 1;

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

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

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

  298.             height *= 2;

  299.         }

  300. 

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

  302. 

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

  304.         s->first_picture = 0;

  305.     }

  306. 

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

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

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

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

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

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

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

  314.     /* NOTE we do not allocate pictures large enough for the possible

  315.      * padding of h/v_count being 4 */

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

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

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

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

  320. 

  321.     switch (pix_fmt_id) {

  322.     case 0x11111100:

  323.         if (s->rgb)

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

  325.         else

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

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

  328.         break;

  329.     case 0x11000000:

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

  331.         break;

  332.     case 0x12111100:

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

  334.         break;

  335.     case 0x21111100:

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

  337.         break;

  338.     case 0x22111100:

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

  340.         break;

  341.     default:

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

  343.         return AVERROR_PATCHWELCOME;

  344.     }

  345.     if (s->ls) {

  346.         if (s->nb_components > 1)

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

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

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

  350.         else

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

  352.     }

  353. 

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

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

  356. 

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

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

  359.         return -1;

  360.     }

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

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

  363.     s->got_picture            = 1;

  364. 

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

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

  367. 

  368. //    printf("%d %d %d %d %d %d\n",

  369. //           s->width, s->height, s->linesize[0], s->linesize[1],

  370. //           s->interlaced, s->avctx->height);

  371. 

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

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

  374.     }

  375. 

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

  377.     if (s->progressive) {

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

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

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

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

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

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

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

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

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

  387.         }

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

  389.     }

  390.     return 0;

  391. }

  392. 

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

  394. {

  395.     int code;

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

  397.     if (code < 0) {

  398.         av_log(s->avctx, AV_LOG_WARNING,

  399.                "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",

  400.                0, dc_index, &s->vlcs[0][dc_index]);

  401.         return 0xffff;

  402.     }

  403. 

  404.     if (code)

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

  406.     else

  407.         return 0;

  408. }

  409. 

  410. /* decode block and dequantize */

  411. static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,

  412.                         int dc_index, int ac_index, int16_t *quant_matrix)

  413. {

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

  415. 

  416.     /* DC coef */

  417.     val = mjpeg_decode_dc(s, dc_index);

  418.     if (val == 0xffff) {

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

  420.         return AVERROR_INVALIDDATA;

  421.     }

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

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

  424.     block[0] = val;

  425.     /* AC coefs */

  426.     i = 0;

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

  428.     do {

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

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

  431. 

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

  433.             code &= 0xf;

  434.         if (code) {

  435.             if (code > MIN_CACHE_BITS - 16)

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

  437. 

  438.             {

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

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

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

  442.             }

  443. 

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

  445. 

  446.             if (i > 63) {

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

  448.                 return AVERROR_INVALIDDATA;

  449.             }

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

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

  452.         }

  453.     } while (i < 63);

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

  455. 

  456.     return 0;

  457. }

  458. 

  459. static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,

  460.                                  int component, int dc_index,

  461.                                  int16_t *quant_matrix, int Al)

  462. {

  463.     int val;

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

  465.     val = mjpeg_decode_dc(s, dc_index);

  466.     if (val == 0xffff) {

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

  468.         return AVERROR_INVALIDDATA;

  469.     }

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

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

  472.     block[0] = val;

  473.     return 0;

  474. }

  475. 

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

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

  478.                                     uint8_t *last_nnz, int ac_index,

  479.                                     int16_t *quant_matrix,

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

  481. {

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

  483. 

  484.     if (*EOBRUN) {

  485.         (*EOBRUN)--;

  486.         return 0;

  487.     }

  488. 

  489.     {

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

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

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

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

  494. 

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

  496.             code &= 0xF;

  497.             if (code) {

  498.                 i += run;

  499.                 if (code > MIN_CACHE_BITS - 16)

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

  501. 

  502.                 {

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

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

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

  506.                 }

  507. 

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

  509. 

  510.                 if (i >= se) {

  511.                     if (i == se) {

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

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

  514.                         break;

  515.                     }

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

  517.                     return AVERROR_INVALIDDATA;

  518.                 }

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

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

  521.             } else {

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

  523.                     i += 15;

  524.                     if (i >= se) {

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

  526.                         return AVERROR_INVALIDDATA;

  527.                     }

  528.                 } else {

  529.                     val = (1 << run);

  530.                     if (run) {

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

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

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

  534.                     }

  535.                     *EOBRUN = val - 1;

  536.                     break;

  537.                 }

  538.             }

  539.         }

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

  541.     }

  542. 

  543.     if (i > *last_nnz)

  544.         *last_nnz = i;

  545. 

  546.     return 0;

  547. }

  548. 

  549. #define REFINE_BIT(j) {                                             \

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

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

  552.     block[j] += SHOW_UBITS(re, &s->gb, 1) *                         \

  553.                 ((quant_matrix[j] ^ sign) - sign) << Al;            \

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

  555. }

  556. 

  557. #define ZERO_RUN                                                    \

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

  559.     if (i > last) {                                                 \

  560.         i += run;                                                   \

  561.         if (i > se) {                                               \

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

  563.             return -1;                                              \

  564.         }                                                           \

  565.         break;                                                      \

  566.     }                                                               \

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

  568.     if (block[j])                                                   \

  569.         REFINE_BIT(j)                                               \

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

  571.         break;                                                      \

  572. }

  573. 

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

  575. static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,

  576.                                    uint8_t *last_nnz,

  577.                                    int ac_index, int16_t *quant_matrix,

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

  579. {

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

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

  582. 

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

  584.     if (*EOBRUN) {

  585.         (*EOBRUN)--;

  586.     } else {

  587.         for (; ; i++) {

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

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

  590. 

  591.             if (code & 0xF) {

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

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

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

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

  596.                 ZERO_RUN;

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

  598.                 val--;

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

  600.                 if (i == se) {

  601.                     if (i > *last_nnz)

  602.                         *last_nnz = i;

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

  604.                     return 0;

  605.                 }

  606.             } else {

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

  608.                 if (run == 0xF) {

  609.                     ZERO_RUN;

  610.                 } else {

  611.                     val = run;

  612.                     run = (1 << run);

  613.                     if (val) {

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

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

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

  617.                     }

  618.                     *EOBRUN = run - 1;

  619.                     break;

  620.                 }

  621.             }

  622.         }

  623. 

  624.         if (i > *last_nnz)

  625.             *last_nnz = i;

  626.     }

  627. 

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

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

  630.         if (block[j])

  631.             REFINE_BIT(j)

  632.     }

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

  634. 

  635.     return 0;

  636. }

  637. #undef REFINE_BIT

  638. #undef ZERO_RUN

  639. 

  640. static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,

  641.                                  int point_transform)

  642. {

  643.     int i, mb_x, mb_y;

  644.     uint16_t (*buffer)[4];

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

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

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

  648. 

  649.     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,

  650.                    (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));

  651.     buffer = s->ljpeg_buffer;

  652. 

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

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

  655. 

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

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

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

  659. 

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

  661.             ptr += linesize >> 1;

  662. 

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

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

  665. 

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

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

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

  669. 

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

  671.                 int pred;

  672. 

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

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

  675. 

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

  677. 

  678.                 left[i] = buffer[mb_x][i] =

  679.                     mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));

  680.             }

  681. 

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

  683.                 align_get_bits(&s->gb);

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

  685.             }

  686.         }

  687. 

  688.         if (s->rct) {

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

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

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

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

  693.             }

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

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

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

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

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

  699.             }

  700.         } else {

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

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

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

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

  705.             }

  706.         }

  707.     }

  708.     return 0;

  709. }

  710. 

  711. static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,

  712.                                  int point_transform)

  713. {

  714.     int i, mb_x, mb_y;

  715.     const int nb_components = 3;

  716. 

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

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

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

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

  721. 

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

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

  724.                     uint8_t *ptr;

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

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

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

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

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

  730.                     x        = 0;

  731.                     y        = 0;

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

  733. 

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

  735.                         int pred;

  736.                         // FIXME optimize this crap

  737.                         ptr = s->picture_ptr->data[c] +

  738.                               (linesize * (v * mb_y + y)) +

  739.                               (h * mb_x + x);

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

  741.                             if (x == 0 && mb_x == 0)

  742.                                 pred = 128 << point_transform;

  743.                             else

  744.                                 pred = ptr[-1];

  745.                         } else {

  746.                             if (x == 0 && mb_x == 0)

  747.                                 pred = ptr[-linesize];

  748.                             else

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

  750.                                         ptr[-linesize], ptr[-1], predictor);

  751.                        }

  752. 

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

  754.                             ptr += linesize >> 1;

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

  756. 

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

  758.                             x = 0;

  759.                             y++;

  760.                         }

  761.                     }

  762.                 }

  763.             } else {

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

  765.                     uint8_t *ptr;

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

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

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

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

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

  771.                     x        = 0;

  772.                     y        = 0;

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

  774. 

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

  776.                         int pred;

  777. 

  778.                         // FIXME optimize this crap

  779.                         ptr = s->picture_ptr->data[c] +

  780.                               (linesize * (v * mb_y + y)) +

  781.                               (h * mb_x + x);

  782.                         PREDICT(pred, ptr[-linesize - 1],

  783.                                 ptr[-linesize], ptr[-1], predictor);

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

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

  786.                             x = 0;

  787.                             y++;

  788.                         }

  789.                     }

  790.                 }

  791.             }

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

  793.                 align_get_bits(&s->gb);

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

  795.             }

  796.         }

  797.     }

  798.     return 0;

  799. }

  800. 

  801. static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,

  802.                              int Al, const uint8_t *mb_bitmask,

  803.                              const AVFrame *reference)

  804. {

  805.     int i, mb_x, mb_y;

  806.     uint8_t *data[MAX_COMPONENTS];

  807.     const uint8_t *reference_data[MAX_COMPONENTS];

  808.     int linesize[MAX_COMPONENTS];

  809.     GetBitContext mb_bitmask_gb;

  810. 

  811.     if (mb_bitmask)

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

  813. 

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

  815.         av_log(s->avctx, AV_LOG_ERROR,

  816.                "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");

  817.         s->flipped = 0;

  818.     }

  819. 

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

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

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

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

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

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

  826.         if (s->flipped) {

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

  828.             int offset = (linesize[c] * (s->v_scount[i] *

  829.                          (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));

  830.             data[c]           += offset;

  831.             reference_data[c] += offset;

  832.             linesize[c]       *= -1;

  833.         }

  834.     }

  835. 

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

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

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

  839. 

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

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

  842. 

  843.             if (get_bits_left(&s->gb) < 0) {

  844.                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",

  845.                        -get_bits_left(&s->gb));

  846.                 return AVERROR_INVALIDDATA;

  847.             }

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

  849.                 uint8_t *ptr;

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

  851.                 int block_offset;

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

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

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

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

  856.                 x = 0;

  857.                 y = 0;

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

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

  860.                                     (h * mb_x + x) * 8);

  861. 

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

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

  864.                     ptr = data[c] + block_offset;

  865.                     if (!s->progressive) {

  866.                         if (copy_mb)

  867.                             copy_block8(ptr, reference_data[c] + block_offset,

  868.                                         linesize[c], linesize[c], 8);

  869.                         else {

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

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

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

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

  874.                                 av_log(s->avctx, AV_LOG_ERROR,

  875.                                        "error y=%d x=%d\n", mb_y, mb_x);

  876.                                 return AVERROR_INVALIDDATA;

  877.                             }

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

  879.                         }

  880.                     } else {

  881.                         int block_idx  = s->block_stride[c] * (v * mb_y + y) +

  882.                                          (h * mb_x + x);

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

  884.                         if (Ah)

  885.                             block[0] += get_bits1(&s->gb) *

  886.                                         s->quant_matrixes[s->quant_index[c]][0] << Al;

  887.                         else if (decode_dc_progressive(s, block, i, s->dc_index[i],

  888.                                                        s->quant_matrixes[s->quant_index[c]],

  889.                                                        Al) < 0) {

  890.                             av_log(s->avctx, AV_LOG_ERROR,

  891.                                    "error y=%d x=%d\n", mb_y, mb_x);

  892.                             return AVERROR_INVALIDDATA;

  893.                         }

  894.                     }

  895.                     // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",

  896.                     //        mb_y, mb_x);

  897.                     // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",

  898.                     //        mb_x, mb_y, x, y, c, s->bottom_field,

  899.                     //        (v * mb_y + y) * 8, (h * mb_x + x) * 8);

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

  901.                         x = 0;

  902.                         y++;

  903.                     }

  904.                 }

  905.             }

  906. 

  907.             if (s->restart_interval) {

  908.                 s->restart_count--;

  909.                 i = 8 + ((-get_bits_count(&s->gb)) & 7);

  910.                 /* skip RSTn */

  911.                 if (show_bits(&s->gb, i) == (1 << i) - 1) {

  912.                     int pos = get_bits_count(&s->gb);

  913.                     align_get_bits(&s->gb);

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

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

  916.                     if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {

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

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

  919.                     } else

  920.                         skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));

  921.                 }

  922.             }

  923.         }

  924.     }

  925.     return 0;

  926. }

  927. 

  928. static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,

  929.                                             int se, int Ah, int Al,

  930.                                             const uint8_t *mb_bitmask,

  931.                                             const AVFrame *reference)

  932. {

  933.     int mb_x, mb_y;

  934.     int EOBRUN = 0;

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

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

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

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

  939.     int last_scan = 0;

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

  941.     GetBitContext mb_bitmask_gb;

  942. 

  943.     if (mb_bitmask)

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

  945. 

  946.     if (!Al) {

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

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

  949.     }

  950. 

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

  952.         int offset      = linesize >> 1;

  953.         data           += offset;

  954.         reference_data += offset;

  955.     }

  956. 

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

  958.         int block_offset = mb_y * linesize * 8;

  959.         uint8_t *ptr     = data + block_offset;

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

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

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

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

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

  965. 

  966.             if (!copy_mb) {

  967.                 int ret;

  968.                 if (Ah)

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

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

  971.                 else

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

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

  974.                 if (ret < 0) {

  975.                     av_log(s->avctx, AV_LOG_ERROR,

  976.                            "error y=%d x=%d\n", mb_y, mb_x);

  977.                     return AVERROR_INVALIDDATA;

  978.                 }

  979.             }

  980. 

  981.             if (last_scan) {

  982.                 if (copy_mb) {

  983.                     copy_block8(ptr, reference_data + block_offset,

  984.                                 linesize, linesize, 8);

  985.                 } else {

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

  987.                     ptr += 8;

  988.                 }

  989.             }

  990.         }

  991.     }

  992.     return 0;

  993. }

  994. 

  995. int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,

  996.                         const AVFrame *reference)

  997. {

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

  999.     int index, id, ret;

  1000.     const int block_size = s->lossless ? 1 : 8;

  1001.     int ilv, prev_shift;

  1002. 

  1003.     /* XXX: verify len field validity */

  1004.     len = get_bits(&s->gb, 16);

  1005.     nb_components = get_bits(&s->gb, 8);

  1006.     if (nb_components == 0 || nb_components > MAX_COMPONENTS) {

  1007.         av_log(s->avctx, AV_LOG_ERROR,

  1008.                "decode_sos: nb_components (%d) unsupported\n", nb_components);

  1009.         return AVERROR_PATCHWELCOME;

  1010.     }

  1011.     if (len != 6 + 2 * nb_components) {

  1012.         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);

  1013.         return AVERROR_INVALIDDATA;

  1014.     }

  1015.     for (i = 0; i < nb_components; i++) {

  1016.         id = get_bits(&s->gb, 8) - 1;

  1017.         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);

  1018.         /* find component index */

  1019.         for (index = 0; index < s->nb_components; index++)

  1020.             if (id == s->component_id[index])

  1021.                 break;

  1022.         if (index == s->nb_components) {

  1023.             av_log(s->avctx, AV_LOG_ERROR,

  1024.                    "decode_sos: index(%d) out of components\n", index);

  1025.             return AVERROR_INVALIDDATA;

  1026.         }

  1027.         /* Metasoft MJPEG codec has Cb and Cr swapped */

  1028.         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')

  1029.             && nb_components == 3 && s->nb_components == 3 && i)

  1030.             index = 3 - i;

  1031. 

  1032.         s->comp_index[i] = index;

  1033. 

  1034.         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];

  1035.         s->h_scount[i]  = s->h_count[index];

  1036.         s->v_scount[i]  = s->v_count[index];

  1037. 

  1038.         s->dc_index[i] = get_bits(&s->gb, 4);

  1039.         s->ac_index[i] = get_bits(&s->gb, 4);

  1040. 

  1041.         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||

  1042.             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)

  1043.             goto out_of_range;

  1044.         if (!s->vlcs[0][s->dc_index[i]].table ||

  1045.             !s->vlcs[1][s->ac_index[i]].table)

  1046.             goto out_of_range;

  1047.     }

  1048. 

  1049.     predictor = get_bits(&s->gb, 8);       /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */

  1050.     ilv = get_bits(&s->gb, 8);             /* JPEG Se / JPEG-LS ILV */

  1051.     prev_shift      = get_bits(&s->gb, 4); /* Ah */

  1052.     point_transform = get_bits(&s->gb, 4); /* Al */

  1053. 

  1054.     if (nb_components > 1) {

  1055.         /* interleaved stream */

  1056.         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);

  1057.         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);

  1058.     } else if (!s->ls) { /* skip this for JPEG-LS */

  1059.         h = s->h_max / s->h_scount[0];

  1060.         v = s->v_max / s->v_scount[0];

  1061.         s->mb_width     = (s->width  + h * block_size - 1) / (h * block_size);

  1062.         s->mb_height    = (s->height + v * block_size - 1) / (v * block_size);

  1063.         s->nb_blocks[0] = 1;

  1064.         s->h_scount[0]  = 1;

  1065.         s->v_scount[0]  = 1;

  1066.     }

  1067. 

  1068.     if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1069.         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",

  1070.                s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",

  1071.                predictor, point_transform, ilv, s->bits,

  1072.                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));

  1073. 

  1074. 

  1075.     /* mjpeg-b can have padding bytes between sos and image data, skip them */

  1076.     for (i = s->mjpb_skiptosod; i > 0; i--)

  1077.         skip_bits(&s->gb, 8);

  1078. 

  1079. next_field:

  1080.     for (i = 0; i < nb_components; i++)

  1081.         s->last_dc[i] = 1024;

  1082. 

  1083.     if (s->lossless) {

  1084.         if (CONFIG_JPEGLS_DECODER && s->ls) {

  1085. //            for () {

  1086. //            reset_ls_coding_parameters(s, 0);

  1087. 

  1088.             if ((ret = ff_jpegls_decode_picture(s, predictor,

  1089.                                                 point_transform, ilv)) < 0)

  1090.                 return ret;

  1091.         } else {

  1092.             if (s->rgb) {

  1093.                 if ((ret = ljpeg_decode_rgb_scan(s, predictor,

  1094.                                                  point_transform)) < 0)

  1095.                     return ret;

  1096.             } else {

  1097.                 if ((ret = ljpeg_decode_yuv_scan(s, predictor,

  1098.                                                  point_transform)) < 0)

  1099.                     return ret;

  1100.             }

  1101.         }

  1102.     } else {

  1103.         if (s->progressive && predictor) {

  1104.             if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,

  1105.                                                         ilv, prev_shift,

  1106.                                                         point_transform,

  1107.                                                         mb_bitmask,

  1108.                                                         reference)) < 0)

  1109.                 return ret;

  1110.         } else {

  1111.             if ((ret = mjpeg_decode_scan(s, nb_components,

  1112.                                          prev_shift, point_transform,

  1113.                                          mb_bitmask, reference)) < 0)

  1114.                 return ret;

  1115.         }

  1116.     }

  1117. 

  1118.     if (s->interlaced &&

  1119.         get_bits_left(&s->gb) > 32 &&

  1120.         show_bits(&s->gb, 8) == 0xFF) {

  1121.         GetBitContext bak = s->gb;

  1122.         align_get_bits(&bak);

  1123.         if (show_bits(&bak, 16) == 0xFFD1) {

  1124.             av_dlog(s->avctx, "AVRn interlaced picture marker found\n");

  1125.             s->gb = bak;

  1126.             skip_bits(&s->gb, 16);

  1127.             s->bottom_field ^= 1;

  1128. 

  1129.             goto next_field;

  1130.         }

  1131.     }

  1132. 

  1133.     emms_c();

  1134.     return 0;

  1135.  out_of_range:

  1136.     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");

  1137.     return AVERROR_INVALIDDATA;

  1138. }

  1139. 

  1140. static int mjpeg_decode_dri(MJpegDecodeContext *s)

  1141. {

  1142.     if (get_bits(&s->gb, 16) != 4)

  1143.         return AVERROR_INVALIDDATA;

  1144.     s->restart_interval = get_bits(&s->gb, 16);

  1145.     s->restart_count    = 0;

  1146.     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",

  1147.            s->restart_interval);

  1148. 

  1149.     return 0;

  1150. }

  1151. 

  1152. static int mjpeg_decode_app(MJpegDecodeContext *s)

  1153. {

  1154.     int len, id, i;

  1155. 

  1156.     len = get_bits(&s->gb, 16);

  1157.     if (len < 5)

  1158.         return AVERROR_INVALIDDATA;

  1159.     if (8 * len > get_bits_left(&s->gb))

  1160.         return AVERROR_INVALIDDATA;

  1161. 

  1162.     id   = get_bits_long(&s->gb, 32);

  1163.     id   = av_be2ne32(id);

  1164.     len -= 6;

  1165. 

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

  1167.         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);

  1168. 

  1169.     /* Buggy AVID, it puts EOI only at every 10th frame. */

  1170.     /* Also, this fourcc is used by non-avid files too, it holds some

  1171.        information, but it's always present in AVID-created files. */

  1172.     if (id == AV_RL32("AVI1")) {

  1173.         /* structure:

  1174.             4bytes      AVI1

  1175.             1bytes      polarity

  1176.             1bytes      always zero

  1177.             4bytes      field_size

  1178.             4bytes      field_size_less_padding

  1179.         */

  1180.         s->buggy_avid = 1;

  1181. //      if (s->first_picture)

  1182. //          printf("mjpeg: workarounding buggy AVID\n");

  1183.         i = get_bits(&s->gb, 8);

  1184.         if (i == 2)

  1185.             s->bottom_field = 1;

  1186.         else if (i == 1)

  1187.             s->bottom_field = 0;

  1188. #if 0

  1189.         skip_bits(&s->gb, 8);

  1190.         skip_bits(&s->gb, 32);

  1191.         skip_bits(&s->gb, 32);

  1192.         len -= 10;

  1193. #endif

  1194. //        if (s->interlace_polarity)

  1195. //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);

  1196.         goto out;

  1197.     }

  1198. 

  1199. //    len -= 2;

  1200. 

  1201.     if (id == AV_RL32("JFIF")) {

  1202.         int t_w, t_h, v1, v2;

  1203.         skip_bits(&s->gb, 8); /* the trailing zero-byte */

  1204.         v1 = get_bits(&s->gb, 8);

  1205.         v2 = get_bits(&s->gb, 8);

  1206.         skip_bits(&s->gb, 8);

  1207. 

  1208.         s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);

  1209.         s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);

  1210. 

  1211.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1212.             av_log(s->avctx, AV_LOG_INFO,

  1213.                    "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",

  1214.                    v1, v2,

  1215.                    s->avctx->sample_aspect_ratio.num,

  1216.                    s->avctx->sample_aspect_ratio.den);

  1217. 

  1218.         t_w = get_bits(&s->gb, 8);

  1219.         t_h = get_bits(&s->gb, 8);

  1220.         if (t_w && t_h) {

  1221.             /* skip thumbnail */

  1222.             if (len -10 - (t_w * t_h * 3) > 0)

  1223.                 len -= t_w * t_h * 3;

  1224.         }

  1225.         len -= 10;

  1226.         goto out;

  1227.     }

  1228. 

  1229.     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {

  1230.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1231.             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");

  1232.         skip_bits(&s->gb, 16); /* version */

  1233.         skip_bits(&s->gb, 16); /* flags0 */

  1234.         skip_bits(&s->gb, 16); /* flags1 */

  1235.         skip_bits(&s->gb,  8); /* transform */

  1236.         len -= 7;

  1237.         goto out;

  1238.     }

  1239. 

  1240.     if (id == AV_RL32("LJIF")) {

  1241.         if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1242.             av_log(s->avctx, AV_LOG_INFO,

  1243.                    "Pegasus lossless jpeg header found\n");

  1244.         skip_bits(&s->gb, 16); /* version ? */

  1245.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1246.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1247.         skip_bits(&s->gb, 16); /* unknwon always 0? */

  1248.         switch (get_bits(&s->gb, 8)) {

  1249.         case 1:

  1250.             s->rgb         = 1;

  1251.             s->pegasus_rct = 0;

  1252.             break;

  1253.         case 2:

  1254.             s->rgb         = 1;

  1255.             s->pegasus_rct = 1;

  1256.             break;

  1257.         default:

  1258.             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");

  1259.         }

  1260.         len -= 9;

  1261.         goto out;

  1262.     }

  1263. 

  1264.     /* Apple MJPEG-A */

  1265.     if ((s->start_code == APP1) && (len > (0x28 - 8))) {

  1266.         id   = get_bits_long(&s->gb, 32);

  1267.         id   = av_be2ne32(id);

  1268.         len -= 4;

  1269.         /* Apple MJPEG-A */

  1270.         if (id == AV_RL32("mjpg")) {

  1271. #if 0

  1272.             skip_bits(&s->gb, 32); /* field size */

  1273.             skip_bits(&s->gb, 32); /* pad field size */

  1274.             skip_bits(&s->gb, 32); /* next off */

  1275.             skip_bits(&s->gb, 32); /* quant off */

  1276.             skip_bits(&s->gb, 32); /* huff off */

  1277.             skip_bits(&s->gb, 32); /* image off */

  1278.             skip_bits(&s->gb, 32); /* scan off */

  1279.             skip_bits(&s->gb, 32); /* data off */

  1280. #endif

  1281.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1282.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");

  1283.         }

  1284.     }

  1285. 

  1286. out:

  1287.     /* slow but needed for extreme adobe jpegs */

  1288.     if (len < 0)

  1289.         av_log(s->avctx, AV_LOG_ERROR,

  1290.                "mjpeg: error, decode_app parser read over the end\n");

  1291.     while (--len > 0)

  1292.         skip_bits(&s->gb, 8);

  1293. 

  1294.     return 0;

  1295. }

  1296. 

  1297. static int mjpeg_decode_com(MJpegDecodeContext *s)

  1298. {

  1299.     int len = get_bits(&s->gb, 16);

  1300.     if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {

  1301.         char *cbuf = av_malloc(len - 1);

  1302.         if (cbuf) {

  1303.             int i;

  1304.             for (i = 0; i < len - 2; i++)

  1305.                 cbuf[i] = get_bits(&s->gb, 8);

  1306.             if (i > 0 && cbuf[i - 1] == '\n')

  1307.                 cbuf[i - 1] = 0;

  1308.             else

  1309.                 cbuf[i] = 0;

  1310. 

  1311.             if (s->avctx->debug & FF_DEBUG_PICT_INFO)

  1312.                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);

  1313. 

  1314.             /* buggy avid, it puts EOI only at every 10th frame */

  1315.             if (!strcmp(cbuf, "AVID")) {

  1316.                 s->buggy_avid = 1;

  1317.                 // if (s->first_picture)

  1318.                 // printf("mjpeg: workarounding buggy AVID\n");

  1319.             } else if (!strcmp(cbuf, "CS=ITU601"))

  1320.                 s->cs_itu601 = 1;

  1321.             else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||

  1322.                      (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))

  1323.                 s->flipped = 1;

  1324. 

  1325.             av_free(cbuf);

  1326.         }

  1327.     }

  1328. 

  1329.     return 0;

  1330. }

  1331. 

  1332. /* return the 8 bit start code value and update the search

  1333.    state. Return -1 if no start code found */

  1334. static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)

  1335. {

  1336.     const uint8_t *buf_ptr;

  1337.     unsigned int v, v2;

  1338.     int val;

  1339. #ifdef DEBUG

  1340.     int skipped = 0;

  1341. #endif

  1342. 

  1343.     buf_ptr = *pbuf_ptr;

  1344.     while (buf_ptr < buf_end) {

  1345.         v  = *buf_ptr++;

  1346.         v2 = *buf_ptr;

  1347.         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {

  1348.             val = *buf_ptr++;

  1349.             goto found;

  1350.         }

  1351. #ifdef DEBUG

  1352.         skipped++;

  1353. #endif

  1354.     }

  1355.     val = -1;

  1356. found:

  1357.     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);

  1358.     *pbuf_ptr = buf_ptr;

  1359.     return val;

  1360. }

  1361. 

  1362. int ff_mjpeg_find_marker(MJpegDecodeContext *s,

  1363.                          const uint8_t **buf_ptr, const uint8_t *buf_end,

  1364.                          const uint8_t **unescaped_buf_ptr,

  1365.                          int *unescaped_buf_size)

  1366. {

  1367.     int start_code;

  1368.     start_code = find_marker(buf_ptr, buf_end);

  1369. 

  1370.     av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);

  1371.     if (!s->buffer)

  1372.         return AVERROR(ENOMEM);

  1373. 

  1374.     /* unescape buffer of SOS, use special treatment for JPEG-LS */

  1375.     if (start_code == SOS && !s->ls) {

  1376.         const uint8_t *src = *buf_ptr;

  1377.         uint8_t *dst = s->buffer;

  1378. 

  1379.         while (src < buf_end) {

  1380.             uint8_t x = *(src++);

  1381. 

  1382.             *(dst++) = x;

  1383.             if (s->avctx->codec_id != AV_CODEC_ID_THP) {

  1384.                 if (x == 0xff) {

  1385.                     while (src < buf_end && x == 0xff)

  1386.                         x = *(src++);

  1387. 

  1388.                     if (x >= 0xd0 && x <= 0xd7)

  1389.                         *(dst++) = x;

  1390.                     else if (x)

  1391.                         break;

  1392.                 }

  1393.             }

  1394.         }

  1395.         *unescaped_buf_ptr  = s->buffer;

  1396.         *unescaped_buf_size = dst - s->buffer;

  1397. 

  1398.         av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",

  1399.                (buf_end - *buf_ptr) - (dst - s->buffer));

  1400.     } else if (start_code == SOS && s->ls) {

  1401.         const uint8_t *src = *buf_ptr;

  1402.         uint8_t *dst  = s->buffer;

  1403.         int bit_count = 0;

  1404.         int t = 0, b = 0;

  1405.         PutBitContext pb;

  1406. 

  1407.         s->cur_scan++;

  1408. 

  1409.         /* find marker */

  1410.         while (src + t < buf_end) {

  1411.             uint8_t x = src[t++];

  1412.             if (x == 0xff) {

  1413.                 while ((src + t < buf_end) && x == 0xff)

  1414.                     x = src[t++];

  1415.                 if (x & 0x80) {

  1416.                     t -= 2;

  1417.                     break;

  1418.                 }

  1419.             }

  1420.         }

  1421.         bit_count = t * 8;

  1422.         init_put_bits(&pb, dst, t);

  1423. 

  1424.         /* unescape bitstream */

  1425.         while (b < t) {

  1426.             uint8_t x = src[b++];

  1427.             put_bits(&pb, 8, x);

  1428.             if (x == 0xFF) {

  1429.                 x = src[b++];

  1430.                 put_bits(&pb, 7, x);

  1431.                 bit_count--;

  1432.             }

  1433.         }

  1434.         flush_put_bits(&pb);

  1435. 

  1436.         *unescaped_buf_ptr  = dst;

  1437.         *unescaped_buf_size = (bit_count + 7) >> 3;

  1438.     } else {

  1439.         *unescaped_buf_ptr  = *buf_ptr;

  1440.         *unescaped_buf_size = buf_end - *buf_ptr;

  1441.     }

  1442. 

  1443.     return start_code;

  1444. }

  1445. 

  1446. int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,

  1447.                           AVPacket *avpkt)

  1448. {

  1449.     const uint8_t *buf = avpkt->data;

  1450.     int buf_size       = avpkt->size;

  1451.     MJpegDecodeContext *s = avctx->priv_data;

  1452.     const uint8_t *buf_end, *buf_ptr;

  1453.     const uint8_t *unescaped_buf_ptr;

  1454.     int unescaped_buf_size;

  1455.     int start_code;

  1456.     int ret = 0;

  1457.     AVFrame *picture = data;

  1458. 

  1459.     s->got_picture = 0; // picture from previous image can not be reused

  1460.     buf_ptr = buf;

  1461.     buf_end = buf + buf_size;

  1462.     while (buf_ptr < buf_end) {

  1463.         /* find start next marker */

  1464.         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,

  1465.                                           &unescaped_buf_ptr,

  1466.                                           &unescaped_buf_size);

  1467.         /* EOF */

  1468.         if (start_code < 0) {

  1469.             goto the_end;

  1470.         } else if (unescaped_buf_size > (1U<<29)) {

  1471.             av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",

  1472.                    start_code, unescaped_buf_size, buf_size);

  1473.             return AVERROR_INVALIDDATA;

  1474.         } else {

  1475.             av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",

  1476.                    start_code, buf_end - buf_ptr);

  1477. 

  1478.             init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);

  1479. 

  1480.             s->start_code = start_code;

  1481.             if (s->avctx->debug & FF_DEBUG_STARTCODE)

  1482.                 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);

  1483. 

  1484.             /* process markers */

  1485.             if (start_code >= 0xd0 && start_code <= 0xd7)

  1486.                 av_log(avctx, AV_LOG_DEBUG,

  1487.                        "restart marker: %d\n", start_code & 0x0f);

  1488.                 /* APP fields */

  1489.             else if (start_code >= APP0 && start_code <= APP15)

  1490.                 mjpeg_decode_app(s);

  1491.                 /* Comment */

  1492.             else if (start_code == COM)

  1493.                 mjpeg_decode_com(s);

  1494. 

  1495.             switch (start_code) {

  1496.             case SOI:

  1497.                 s->restart_interval = 0;

  1498.                 s->restart_count    = 0;

  1499.                 /* nothing to do on SOI */

  1500.                 break;

  1501.             case DQT:

  1502.                 ff_mjpeg_decode_dqt(s);

  1503.                 break;

  1504.             case DHT:

  1505.                 if ((ret = ff_mjpeg_decode_dht(s)) < 0) {

  1506.                     av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");

  1507.                     return ret;

  1508.                 }

  1509.                 break;

  1510.             case SOF0:

  1511.             case SOF1:

  1512.                 s->lossless    = 0;

  1513.                 s->ls          = 0;

  1514.                 s->progressive = 0;

  1515.                 if ((ret = ff_mjpeg_decode_sof(s)) < 0)

  1516.                     return ret;

  1517.                 break;

  1518.             case SOF2:

  1519.                 s->lossless    = 0;

  1520.                 s->ls          = 0;

  1521.                 s->progressive = 1;

  1522.                 if ((ret = ff_mjpeg_decode_sof(s)) < 0)

  1523.                     return ret;

  1524.                 break;

  1525.             case SOF3:

  1526.                 s->lossless    = 1;

  1527.                 s->ls          = 0;

  1528.                 s->progressive = 0;

  1529.                 if ((ret = ff_mjpeg_decode_sof(s)) < 0)

  1530.                     return ret;

  1531.                 break;

  1532.             case SOF48:

  1533.                 s->lossless    = 1;

  1534.                 s->ls          = 1;

  1535.                 s->progressive = 0;

  1536.                 if ((ret = ff_mjpeg_decode_sof(s)) < 0)

  1537.                     return ret;

  1538.                 break;

  1539.             case LSE:

  1540.                 if (!CONFIG_JPEGLS_DECODER ||

  1541.                     (ret = ff_jpegls_decode_lse(s)) < 0)

  1542.                     return ret;

  1543.                 break;

  1544.             case EOI:

  1545.                 s->cur_scan = 0;

  1546.                 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1547.                     break;

  1548. eoi_parser:

  1549.                 if (!s->got_picture) {

  1550.                     av_log(avctx, AV_LOG_WARNING,

  1551.                            "Found EOI before any SOF, ignoring\n");

  1552.                     break;

  1553.                     }

  1554.                 if (s->interlaced) {

  1555.                     s->bottom_field ^= 1;

  1556.                     /* if not bottom field, do not output image yet */

  1557.                     if (s->bottom_field == !s->interlace_polarity)

  1558.                         goto not_the_end;

  1559.                     }

  1560.                     *picture   = *s->picture_ptr;

  1561.                     *data_size = sizeof(AVFrame);

  1562. 

  1563.                     if (!s->lossless) {

  1564.                         picture->quality      = FFMAX3(s->qscale[0],

  1565.                                                        s->qscale[1],

  1566.                                                        s->qscale[2]);

  1567.                         picture->qstride      = 0;

  1568.                         picture->qscale_table = s->qscale_table;

  1569.                         memset(picture->qscale_table, picture->quality,

  1570.                                (s->width + 15) / 16);

  1571.                         if (avctx->debug & FF_DEBUG_QP)

  1572.                             av_log(avctx, AV_LOG_DEBUG,

  1573.                                    "QP: %d\n", picture->quality);

  1574.                         picture->quality *= FF_QP2LAMBDA;

  1575.                     }

  1576. 

  1577.                 goto the_end;

  1578.             case SOS:

  1579.                 if (!s->got_picture) {

  1580.                     av_log(avctx, AV_LOG_WARNING,

  1581.                            "Can not process SOS before SOF, skipping\n");

  1582.                     break;

  1583.                     }

  1584.                 if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&

  1585.                     (avctx->err_recognition & AV_EF_EXPLODE))

  1586.                     return ret;

  1587.                 /* buggy avid puts EOI every 10-20th frame */

  1588.                 /* if restart period is over process EOI */

  1589.                 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)

  1590.                     goto eoi_parser;

  1591.                 break;

  1592.             case DRI:

  1593.                 mjpeg_decode_dri(s);

  1594.                 break;

  1595.             case SOF5:

  1596.             case SOF6:

  1597.             case SOF7:

  1598.             case SOF9:

  1599.             case SOF10:

  1600.             case SOF11:

  1601.             case SOF13:

  1602.             case SOF14:

  1603.             case SOF15:

  1604.             case JPG:

  1605.                 av_log(avctx, AV_LOG_ERROR,

  1606.                        "mjpeg: unsupported coding type (%x)\n", start_code);

  1607.                 break;

  1608. //              default:

  1609. //              printf("mjpeg: unsupported marker (%x)\n", start_code);

  1610. //              break;

  1611.             }

  1612. 

  1613. not_the_end:

  1614.             /* eof process start code */

  1615.             buf_ptr += (get_bits_count(&s->gb) + 7) / 8;

  1616.             av_log(avctx, AV_LOG_DEBUG,

  1617.                    "marker parser used %d bytes (%d bits)\n",

  1618.                    (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));

  1619.         }

  1620.     }

  1621.     if (s->got_picture) {

  1622.         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");

  1623.         goto eoi_parser;

  1624.     }

  1625.     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");

  1626.     return AVERROR_INVALIDDATA;

  1627. the_end:

  1628.     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",

  1629.            buf_end - buf_ptr);

  1630. //  return buf_end - buf_ptr;

  1631.     return buf_ptr - buf;

  1632. }

  1633. 

  1634. av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)

  1635. {

  1636.     MJpegDecodeContext *s = avctx->priv_data;

  1637.     int i, j;

  1638. 

  1639.     if (s->picture_ptr && s->picture_ptr->data[0])

  1640.         avctx->release_buffer(avctx, s->picture_ptr);

  1641. 

  1642.     av_free(s->buffer);

  1643.     av_free(s->qscale_table);

  1644.     av_freep(&s->ljpeg_buffer);

  1645.     s->ljpeg_buffer_size = 0;

  1646. 

  1647.     for (i = 0; i < 3; i++) {

  1648.         for (j = 0; j < 4; j++)

  1649.             ff_free_vlc(&s->vlcs[i][j]);

  1650.     }

  1651.     for (i = 0; i < MAX_COMPONENTS; i++) {

  1652.         av_freep(&s->blocks[i]);

  1653.         av_freep(&s->last_nnz[i]);

  1654.     }

  1655.     return 0;

  1656. }

  1657. 

  1658. #define OFFSET(x) offsetof(MJpegDecodeContext, x)

  1659. #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

  1660. static const AVOption options[] = {

  1661.     { "extern_huff", "Use external huffman table.",

  1662.       OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },

  1663.     { NULL },

  1664. };

  1665. 

  1666. static const AVClass mjpegdec_class = {

  1667.     .class_name = "MJPEG decoder",

  1668.     .item_name  = av_default_item_name,

  1669.     .option     = options,

  1670.     .version    = LIBAVUTIL_VERSION_INT,

  1671. };

  1672. 

  1673. AVCodec ff_mjpeg_decoder = {

  1674.     .name           = "mjpeg",

  1675.     .type           = AVMEDIA_TYPE_VIDEO,

  1676.     .id             = AV_CODEC_ID_MJPEG,

  1677.     .priv_data_size = sizeof(MJpegDecodeContext),

  1678.     .init           = ff_mjpeg_decode_init,

  1679.     .close          = ff_mjpeg_decode_end,

  1680.     .decode         = ff_mjpeg_decode_frame,

  1681.     .capabilities   = CODEC_CAP_DR1,

  1682.     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),

  1683.     .priv_class     = &mjpegdec_class,

  1684. };

  1685. 

  1686. AVCodec ff_thp_decoder = {

  1687.     .name           = "thp",

  1688.     .type           = AVMEDIA_TYPE_VIDEO,

  1689.     .id             = AV_CODEC_ID_THP,

  1690.     .priv_data_size = sizeof(MJpegDecodeContext),

  1691.     .init           = ff_mjpeg_decode_init,

  1692.     .close          = ff_mjpeg_decode_end,

  1693.     .decode         = ff_mjpeg_decode_frame,

  1694.     .capabilities   = CODEC_CAP_DR1,

  1695.     .long_name      = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),

  1696. };