libavcodec/mjpegdec.c
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00001 /*
00002  * MJPEG decoder
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  * Copyright (c) 2003 Alex Beregszaszi
00005  * Copyright (c) 2003-2004 Michael Niedermayer
00006  *
00007  * Support for external huffman table, various fixes (AVID workaround),
00008  * aspecting, new decode_frame mechanism and apple mjpeg-b support
00009  *                                  by Alex Beregszaszi
00010  *
00011  * This file is part of FFmpeg.
00012  *
00013  * FFmpeg is free software; you can redistribute it and/or
00014  * modify it under the terms of the GNU Lesser General Public
00015  * License as published by the Free Software Foundation; either
00016  * version 2.1 of the License, or (at your option) any later version.
00017  *
00018  * FFmpeg is distributed in the hope that it will be useful,
00019  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00020  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00021  * Lesser General Public License for more details.
00022  *
00023  * You should have received a copy of the GNU Lesser General Public
00024  * License along with FFmpeg; if not, write to the Free Software
00025  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00026  */
00027 
00033 // #define DEBUG
00034 #include <assert.h>
00035 
00036 #include "libavutil/imgutils.h"
00037 #include "libavutil/avassert.h"
00038 #include "libavutil/opt.h"
00039 #include "avcodec.h"
00040 #include "dsputil.h"
00041 #include "mjpeg.h"
00042 #include "mjpegdec.h"
00043 #include "jpeglsdec.h"
00044 
00045 
00046 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
00047                      const uint8_t *val_table, int nb_codes,
00048                      int use_static, int is_ac)
00049 {
00050     uint8_t huff_size[256];
00051     uint16_t huff_code[256];
00052     uint16_t huff_sym[256];
00053     int i;
00054 
00055     assert(nb_codes <= 256);
00056 
00057     memset(huff_size, 0, sizeof(huff_size));
00058     ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
00059 
00060     for (i = 0; i < 256; i++)
00061         huff_sym[i] = i + 16 * is_ac;
00062 
00063     if (is_ac)
00064         huff_sym[0] = 16 * 256;
00065 
00066     return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
00067                            huff_code, 2, 2, huff_sym, 2, 2, use_static);
00068 }
00069 
00070 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
00071 {
00072     build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
00073               ff_mjpeg_val_dc, 12, 0, 0);
00074     build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
00075               ff_mjpeg_val_dc, 12, 0, 0);
00076     build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
00077               ff_mjpeg_val_ac_luminance, 251, 0, 1);
00078     build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
00079               ff_mjpeg_val_ac_chrominance, 251, 0, 1);
00080     build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
00081               ff_mjpeg_val_ac_luminance, 251, 0, 0);
00082     build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
00083               ff_mjpeg_val_ac_chrominance, 251, 0, 0);
00084 }
00085 
00086 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
00087 {
00088     MJpegDecodeContext *s = avctx->priv_data;
00089 
00090     if (!s->picture_ptr)
00091         s->picture_ptr = &s->picture;
00092     avcodec_get_frame_defaults(&s->picture);
00093 
00094     s->avctx = avctx;
00095     dsputil_init(&s->dsp, avctx);
00096     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
00097     s->buffer_size   = 0;
00098     s->buffer        = NULL;
00099     s->start_code    = -1;
00100     s->first_picture = 1;
00101     s->org_height    = avctx->coded_height;
00102     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
00103 
00104     build_basic_mjpeg_vlc(s);
00105 
00106 #if FF_API_MJPEG_GLOBAL_OPTS
00107     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
00108         s->extern_huff = 1;
00109 #endif
00110     if (s->extern_huff) {
00111         av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
00112         init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
00113         if (ff_mjpeg_decode_dht(s)) {
00114             av_log(avctx, AV_LOG_ERROR,
00115                    "mjpeg: error using external huffman table, switching back to internal\n");
00116             build_basic_mjpeg_vlc(s);
00117         }
00118     }
00119     if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
00120         s->interlace_polarity = 1;           /* bottom field first */
00121         av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
00122     }
00123     if (avctx->codec->id == CODEC_ID_AMV)
00124         s->flipped = 1;
00125 
00126     return 0;
00127 }
00128 
00129 
00130 /* quantize tables */
00131 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
00132 {
00133     int len, index, i, j;
00134 
00135     len = get_bits(&s->gb, 16) - 2;
00136 
00137     while (len >= 65) {
00138         /* only 8 bit precision handled */
00139         if (get_bits(&s->gb, 4) != 0) {
00140             av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
00141             return -1;
00142         }
00143         index = get_bits(&s->gb, 4);
00144         if (index >= 4)
00145             return -1;
00146         av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
00147         /* read quant table */
00148         for (i = 0; i < 64; i++) {
00149             j = s->scantable.permutated[i];
00150             s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
00151         }
00152 
00153         // XXX FIXME finetune, and perhaps add dc too
00154         s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
00155                                  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
00156         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
00157                index, s->qscale[index]);
00158         len -= 65;
00159     }
00160     return 0;
00161 }
00162 
00163 /* decode huffman tables and build VLC decoders */
00164 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
00165 {
00166     int len, index, i, class, n, v, code_max;
00167     uint8_t bits_table[17];
00168     uint8_t val_table[256];
00169 
00170     len = get_bits(&s->gb, 16) - 2;
00171 
00172     while (len > 0) {
00173         if (len < 17)
00174             return -1;
00175         class = get_bits(&s->gb, 4);
00176         if (class >= 2)
00177             return -1;
00178         index = get_bits(&s->gb, 4);
00179         if (index >= 4)
00180             return -1;
00181         n = 0;
00182         for (i = 1; i <= 16; i++) {
00183             bits_table[i] = get_bits(&s->gb, 8);
00184             n += bits_table[i];
00185         }
00186         len -= 17;
00187         if (len < n || n > 256)
00188             return -1;
00189 
00190         code_max = 0;
00191         for (i = 0; i < n; i++) {
00192             v = get_bits(&s->gb, 8);
00193             if (v > code_max)
00194                 code_max = v;
00195             val_table[i] = v;
00196         }
00197         len -= n;
00198 
00199         /* build VLC and flush previous vlc if present */
00200         free_vlc(&s->vlcs[class][index]);
00201         av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
00202                class, index, code_max + 1);
00203         if (build_vlc(&s->vlcs[class][index], bits_table, val_table,
00204                       code_max + 1, 0, class > 0) < 0)
00205             return -1;
00206 
00207         if (class > 0) {
00208             free_vlc(&s->vlcs[2][index]);
00209             if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
00210                           code_max + 1, 0, 0) < 0)
00211                 return -1;
00212         }
00213     }
00214     return 0;
00215 }
00216 
00217 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
00218 {
00219     int len, nb_components, i, width, height, pix_fmt_id;
00220 
00221     s->cur_scan = 0;
00222     s->upscale_h = s->upscale_v = 0;
00223 
00224     /* XXX: verify len field validity */
00225     len     = get_bits(&s->gb, 16);
00226     s->bits = get_bits(&s->gb, 8);
00227 
00228     if (s->pegasus_rct)
00229         s->bits = 9;
00230     if (s->bits == 9 && !s->pegasus_rct)
00231         s->rct  = 1;    // FIXME ugly
00232 
00233     if (s->bits != 8 && !s->lossless) {
00234         av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
00235         return -1;
00236     }
00237 
00238     if(s->lossless && s->avctx->lowres){
00239         av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
00240         return -1;
00241     }
00242 
00243     height = get_bits(&s->gb, 16);
00244     width  = get_bits(&s->gb, 16);
00245 
00246     // HACK for odd_height.mov
00247     if (s->interlaced && s->width == width && s->height == height + 1)
00248         height= s->height;
00249 
00250     av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
00251     if (av_image_check_size(width, height, 0, s->avctx))
00252         return -1;
00253 
00254     nb_components = get_bits(&s->gb, 8);
00255     if (nb_components <= 0 ||
00256         nb_components > MAX_COMPONENTS)
00257         return -1;
00258     if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
00259         av_log(s->avctx, AV_LOG_ERROR,
00260                "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
00261         return -1;
00262     }
00263     s->nb_components = nb_components;
00264     s->h_max         = 1;
00265     s->v_max         = 1;
00266     for (i = 0; i < nb_components; i++) {
00267         /* component id */
00268         s->component_id[i] = get_bits(&s->gb, 8) - 1;
00269         s->h_count[i]      = get_bits(&s->gb, 4);
00270         s->v_count[i]      = get_bits(&s->gb, 4);
00271         /* compute hmax and vmax (only used in interleaved case) */
00272         if (s->h_count[i] > s->h_max)
00273             s->h_max = s->h_count[i];
00274         if (s->v_count[i] > s->v_max)
00275             s->v_max = s->v_count[i];
00276         s->quant_index[i] = get_bits(&s->gb, 8);
00277         if (s->quant_index[i] >= 4)
00278             return -1;
00279         av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
00280                i, s->h_count[i], s->v_count[i],
00281                s->component_id[i], s->quant_index[i]);
00282     }
00283 
00284     if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
00285         av_log(s->avctx, AV_LOG_ERROR,
00286                "Subsampling in JPEG-LS is not supported.\n");
00287         return -1;
00288     }
00289 
00290     if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
00291         s->rgb = 1;
00292 
00293     /* if different size, realloc/alloc picture */
00294     /* XXX: also check h_count and v_count */
00295     if (width != s->width || height != s->height) {
00296         av_freep(&s->qscale_table);
00297 
00298         s->width      = width;
00299         s->height     = height;
00300         s->interlaced = 0;
00301 
00302         /* test interlaced mode */
00303         if (s->first_picture   &&
00304             s->org_height != 0 &&
00305             s->height < ((s->org_height * 3) / 4)) {
00306             s->interlaced                    = 1;
00307             s->bottom_field                  = s->interlace_polarity;
00308             s->picture_ptr->interlaced_frame = 1;
00309             s->picture_ptr->top_field_first  = !s->interlace_polarity;
00310             height *= 2;
00311         }
00312 
00313         avcodec_set_dimensions(s->avctx, width, height);
00314 
00315         s->qscale_table  = av_mallocz((s->width + 15) / 16);
00316         s->first_picture = 0;
00317     }
00318 
00319     if (s->interlaced && (s->bottom_field == !s->interlace_polarity))
00320         return 0;
00321 
00322     /* XXX: not complete test ! */
00323     pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
00324                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
00325                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
00326                  (s->h_count[3] <<  4) |  s->v_count[3];
00327     av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
00328     /* NOTE we do not allocate pictures large enough for the possible
00329      * padding of h/v_count being 4 */
00330     if (!(pix_fmt_id & 0xD0D0D0D0))
00331         pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
00332     if (!(pix_fmt_id & 0x0D0D0D0D))
00333         pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
00334 
00335     switch (pix_fmt_id) {
00336     case 0x11111100:
00337         if (s->rgb)
00338             s->avctx->pix_fmt = PIX_FMT_BGR24;
00339         else {
00340             if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
00341                 s->avctx->pix_fmt = PIX_FMT_GBR24P;
00342             } else {
00343             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00344             s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00345             }
00346         }
00347         assert(s->nb_components == 3);
00348         break;
00349     case 0x12121100:
00350     case 0x22122100:
00351         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00352         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00353         s->upscale_v = 2;
00354         s->upscale_h = (pix_fmt_id == 0x22122100);
00355         s->chroma_height = s->height;
00356         break;
00357     case 0x21211100:
00358     case 0x22211200:
00359         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00360         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00361         s->upscale_v = (pix_fmt_id == 0x22211200);
00362         s->upscale_h = 2;
00363         s->chroma_height = s->height;
00364         break;
00365     case 0x22221100:
00366         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00367         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00368         s->upscale_v = 2;
00369         s->upscale_h = 2;
00370         s->chroma_height = s->height / 2;
00371         break;
00372     case 0x11000000:
00373         if(s->bits <= 8)
00374             s->avctx->pix_fmt = PIX_FMT_GRAY8;
00375         else
00376             s->avctx->pix_fmt = PIX_FMT_GRAY16;
00377         break;
00378     case 0x12111100:
00379     case 0x22211100:
00380     case 0x22112100:
00381         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
00382         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00383         s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
00384         s->chroma_height = s->height / 2;
00385         break;
00386     case 0x21111100:
00387         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
00388         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00389         break;
00390     case 0x22121100:
00391     case 0x22111200:
00392         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
00393         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00394         s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
00395         break;
00396     case 0x22111100:
00397         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
00398         s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00399         break;
00400     default:
00401         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
00402         return -1;
00403     }
00404     if (s->ls) {
00405         s->upscale_h = s->upscale_v = 0;
00406         if (s->nb_components > 1)
00407             s->avctx->pix_fmt = PIX_FMT_RGB24;
00408         else if (s->bits <= 8)
00409             s->avctx->pix_fmt = PIX_FMT_GRAY8;
00410         else
00411             s->avctx->pix_fmt = PIX_FMT_GRAY16;
00412     }
00413 
00414     if (s->picture_ptr->data[0])
00415         s->avctx->release_buffer(s->avctx, s->picture_ptr);
00416 
00417     if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
00418         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00419         return -1;
00420     }
00421     s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
00422     s->picture_ptr->key_frame = 1;
00423     s->got_picture            = 1;
00424 
00425     for (i = 0; i < 3; i++)
00426         s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
00427 
00428 //    printf("%d %d %d %d %d %d\n",
00429 //           s->width, s->height, s->linesize[0], s->linesize[1],
00430 //           s->interlaced, s->avctx->height);
00431 
00432     if (len != (8 + (3 * nb_components)))
00433         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
00434 
00435     /* totally blank picture as progressive JPEG will only add details to it */
00436     if (s->progressive) {
00437         int bw = (width  + s->h_max * 8 - 1) / (s->h_max * 8);
00438         int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
00439         for (i = 0; i < s->nb_components; i++) {
00440             int size = bw * bh * s->h_count[i] * s->v_count[i];
00441             av_freep(&s->blocks[i]);
00442             av_freep(&s->last_nnz[i]);
00443             s->blocks[i]       = av_malloc(size * sizeof(**s->blocks));
00444             s->last_nnz[i]     = av_mallocz(size * sizeof(**s->last_nnz));
00445             s->block_stride[i] = bw * s->h_count[i];
00446         }
00447         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
00448     }
00449     return 0;
00450 }
00451 
00452 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
00453 {
00454     int code;
00455     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
00456     if (code < 0) {
00457         av_log(s->avctx, AV_LOG_WARNING,
00458                "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
00459                0, dc_index, &s->vlcs[0][dc_index]);
00460         return 0xffff;
00461     }
00462 
00463     if (code)
00464         return get_xbits(&s->gb, code);
00465     else
00466         return 0;
00467 }
00468 
00469 /* decode block and dequantize */
00470 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
00471                         int dc_index, int ac_index, int16_t *quant_matrix)
00472 {
00473     int code, i, j, level, val;
00474 
00475     /* DC coef */
00476     val = mjpeg_decode_dc(s, dc_index);
00477     if (val == 0xffff) {
00478         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00479         return -1;
00480     }
00481     val = val * quant_matrix[0] + s->last_dc[component];
00482     s->last_dc[component] = val;
00483     block[0] = val;
00484     /* AC coefs */
00485     i = 0;
00486     {OPEN_READER(re, &s->gb);
00487     do {
00488         UPDATE_CACHE(re, &s->gb);
00489         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
00490 
00491         i += ((unsigned)code) >> 4;
00492             code &= 0xf;
00493         if (code) {
00494             if (code > MIN_CACHE_BITS - 16)
00495                 UPDATE_CACHE(re, &s->gb);
00496 
00497             {
00498                 int cache = GET_CACHE(re, &s->gb);
00499                 int sign  = (~cache) >> 31;
00500                 level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00501             }
00502 
00503             LAST_SKIP_BITS(re, &s->gb, code);
00504 
00505             if (i > 63) {
00506                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00507                 return -1;
00508             }
00509             j        = s->scantable.permutated[i];
00510             block[j] = level * quant_matrix[j];
00511         }
00512     } while (i < 63);
00513     CLOSE_READER(re, &s->gb);}
00514 
00515     return 0;
00516 }
00517 
00518 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
00519                                  int component, int dc_index,
00520                                  int16_t *quant_matrix, int Al)
00521 {
00522     int val;
00523     s->dsp.clear_block(block);
00524     val = mjpeg_decode_dc(s, dc_index);
00525     if (val == 0xffff) {
00526         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00527         return -1;
00528     }
00529     val = (val * quant_matrix[0] << Al) + s->last_dc[component];
00530     s->last_dc[component] = val;
00531     block[0] = val;
00532     return 0;
00533 }
00534 
00535 /* decode block and dequantize - progressive JPEG version */
00536 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
00537                                     uint8_t *last_nnz, int ac_index,
00538                                     int16_t *quant_matrix,
00539                                     int ss, int se, int Al, int *EOBRUN)
00540 {
00541     int code, i, j, level, val, run;
00542 
00543     if (*EOBRUN) {
00544         (*EOBRUN)--;
00545         return 0;
00546     }
00547 
00548     {
00549         OPEN_READER(re, &s->gb);
00550         for (i = ss; ; i++) {
00551             UPDATE_CACHE(re, &s->gb);
00552             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00553 
00554             run = ((unsigned) code) >> 4;
00555             code &= 0xF;
00556             if (code) {
00557                 i += run;
00558                 if (code > MIN_CACHE_BITS - 16)
00559                     UPDATE_CACHE(re, &s->gb);
00560 
00561                 {
00562                     int cache = GET_CACHE(re, &s->gb);
00563                     int sign  = (~cache) >> 31;
00564                     level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00565                 }
00566 
00567                 LAST_SKIP_BITS(re, &s->gb, code);
00568 
00569                 if (i >= se) {
00570                     if (i == se) {
00571                         j = s->scantable.permutated[se];
00572                         block[j] = level * quant_matrix[j] << Al;
00573                         break;
00574                     }
00575                     av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00576                     return -1;
00577                 }
00578                 j = s->scantable.permutated[i];
00579                 block[j] = level * quant_matrix[j] << Al;
00580             } else {
00581                 if (run == 0xF) {// ZRL - skip 15 coefficients
00582                     i += 15;
00583                     if (i >= se) {
00584                         av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
00585                         return -1;
00586                     }
00587                 } else {
00588                     val = (1 << run);
00589                     if (run) {
00590                         UPDATE_CACHE(re, &s->gb);
00591                         val += NEG_USR32(GET_CACHE(re, &s->gb), run);
00592                         LAST_SKIP_BITS(re, &s->gb, run);
00593                     }
00594                     *EOBRUN = val - 1;
00595                     break;
00596                 }
00597             }
00598         }
00599         CLOSE_READER(re, &s->gb);
00600     }
00601 
00602     if (i > *last_nnz)
00603         *last_nnz = i;
00604 
00605     return 0;
00606 }
00607 
00608 #define REFINE_BIT(j) {                                             \
00609     UPDATE_CACHE(re, &s->gb);                                       \
00610     sign = block[j] >> 15;                                          \
00611     block[j] += SHOW_UBITS(re, &s->gb, 1) *                         \
00612                 ((quant_matrix[j] ^ sign) - sign) << Al;            \
00613     LAST_SKIP_BITS(re, &s->gb, 1);                                  \
00614 }
00615 
00616 #define ZERO_RUN                                                    \
00617 for (; ; i++) {                                                     \
00618     if (i > last) {                                                 \
00619         i += run;                                                   \
00620         if (i > se) {                                               \
00621             av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
00622             return -1;                                              \
00623         }                                                           \
00624         break;                                                      \
00625     }                                                               \
00626     j = s->scantable.permutated[i];                                 \
00627     if (block[j])                                                   \
00628         REFINE_BIT(j)                                               \
00629     else if (run-- == 0)                                            \
00630         break;                                                      \
00631 }
00632 
00633 /* decode block and dequantize - progressive JPEG refinement pass */
00634 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
00635                                    uint8_t *last_nnz,
00636                                    int ac_index, int16_t *quant_matrix,
00637                                    int ss, int se, int Al, int *EOBRUN)
00638 {
00639     int code, i = ss, j, sign, val, run;
00640     int last    = FFMIN(se, *last_nnz);
00641 
00642     OPEN_READER(re, &s->gb);
00643     if (*EOBRUN) {
00644         (*EOBRUN)--;
00645     } else {
00646         for (; ; i++) {
00647             UPDATE_CACHE(re, &s->gb);
00648             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00649 
00650             if (code & 0xF) {
00651                 run = ((unsigned) code) >> 4;
00652                 UPDATE_CACHE(re, &s->gb);
00653                 val = SHOW_UBITS(re, &s->gb, 1);
00654                 LAST_SKIP_BITS(re, &s->gb, 1);
00655                 ZERO_RUN;
00656                 j = s->scantable.permutated[i];
00657                 val--;
00658                 block[j] = ((quant_matrix[j]^val) - val) << Al;
00659                 if (i == se) {
00660                     if (i > *last_nnz)
00661                         *last_nnz = i;
00662                     CLOSE_READER(re, &s->gb);
00663                     return 0;
00664                 }
00665             } else {
00666                 run = ((unsigned) code) >> 4;
00667                 if (run == 0xF) {
00668                     ZERO_RUN;
00669                 } else {
00670                     val = run;
00671                     run = (1 << run);
00672                     if (val) {
00673                         UPDATE_CACHE(re, &s->gb);
00674                         run += SHOW_UBITS(re, &s->gb, val);
00675                         LAST_SKIP_BITS(re, &s->gb, val);
00676                     }
00677                     *EOBRUN = run - 1;
00678                     break;
00679                 }
00680             }
00681         }
00682 
00683         if (i > *last_nnz)
00684             *last_nnz = i;
00685     }
00686 
00687     for (; i <= last; i++) {
00688         j = s->scantable.permutated[i];
00689         if (block[j])
00690             REFINE_BIT(j)
00691     }
00692     CLOSE_READER(re, &s->gb);
00693 
00694     return 0;
00695 }
00696 #undef REFINE_BIT
00697 #undef ZERO_RUN
00698 
00699 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
00700 {
00701     int i, mb_x, mb_y;
00702     uint16_t (*buffer)[4];
00703     int left[3], top[3], topleft[3];
00704     const int linesize = s->linesize[0];
00705     const int mask     = (1 << s->bits) - 1;
00706     int resync_mb_y = 0;
00707     int resync_mb_x = 0;
00708 
00709     s->restart_count = s->restart_interval;
00710 
00711     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
00712                    (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
00713     buffer = s->ljpeg_buffer;
00714 
00715     for (i = 0; i < 3; i++)
00716         buffer[0][i] = 1 << (s->bits - 1);
00717 
00718     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00719         uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
00720 
00721         if (s->interlaced && s->bottom_field)
00722             ptr += linesize >> 1;
00723 
00724         for (i = 0; i < 3; i++)
00725             top[i] = left[i] = topleft[i] = buffer[0][i];
00726 
00727         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00728             int modified_predictor = predictor;
00729 
00730             if (s->restart_interval && !s->restart_count){
00731                 s->restart_count = s->restart_interval;
00732                 resync_mb_x = mb_x;
00733                 resync_mb_y = mb_y;
00734                 for(i=0; i<3; i++)
00735                     top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
00736             }
00737             if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
00738                 modified_predictor = 1;
00739 
00740             for (i=0;i<nb_components;i++) {
00741                 int pred, dc;
00742 
00743                 topleft[i] = top[i];
00744                 top[i]     = buffer[mb_x][i];
00745 
00746                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
00747 
00748                 dc = mjpeg_decode_dc(s, s->dc_index[i]);
00749                 if(dc == 0xFFFF)
00750                     return -1;
00751 
00752                 left[i] = buffer[mb_x][i] =
00753                     mask & (pred + (dc << point_transform));
00754             }
00755 
00756             if (s->restart_interval && !--s->restart_count) {
00757                 align_get_bits(&s->gb);
00758                 skip_bits(&s->gb, 16); /* skip RSTn */
00759             }
00760         }
00761 
00762         if (s->rct) {
00763             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00764                 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
00765                 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
00766                 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
00767             }
00768         } else if (s->pegasus_rct) {
00769             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00770                 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
00771                 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
00772                 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
00773             }
00774         } else {
00775             for(i=0; i<nb_components; i++) {
00776                 int c= s->comp_index[i];
00777                 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00778                     ptr[3*mb_x+2-c] = buffer[mb_x][i];
00779                 }
00780             }
00781         }
00782     }
00783     return 0;
00784 }
00785 
00786 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
00787                                  int point_transform)
00788 {
00789     int i, mb_x, mb_y;
00790     const int nb_components=s->nb_components;
00791     int bits= (s->bits+7)&~7;
00792     int resync_mb_y = 0;
00793     int resync_mb_x = 0;
00794 
00795     point_transform += bits - s->bits;
00796 
00797     av_assert0(nb_components==1 || nb_components==3);
00798 
00799     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00800         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00801             if (s->restart_interval && !s->restart_count){
00802                 s->restart_count = s->restart_interval;
00803                 resync_mb_x = mb_x;
00804                 resync_mb_y = mb_y;
00805             }
00806 
00807             if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
00808                 int toprow  = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
00809                 int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
00810                 for (i = 0; i < nb_components; i++) {
00811                     uint8_t *ptr;
00812                     uint16_t *ptr16;
00813                     int n, h, v, x, y, c, j, linesize;
00814                     n = s->nb_blocks[i];
00815                     c = s->comp_index[i];
00816                     h = s->h_scount[i];
00817                     v = s->v_scount[i];
00818                     x = 0;
00819                     y = 0;
00820                     linesize= s->linesize[c];
00821 
00822                     if(bits>8) linesize /= 2;
00823 
00824                     for(j=0; j<n; j++) {
00825                         int pred, dc;
00826 
00827                         dc = mjpeg_decode_dc(s, s->dc_index[i]);
00828                         if(dc == 0xFFFF)
00829                             return -1;
00830                         if(bits<=8){
00831                         ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
00832                         if(y==0 && toprow){
00833                             if(x==0 && leftcol){
00834                                 pred= 1 << (bits - 1);
00835                             }else{
00836                                 pred= ptr[-1];
00837                             }
00838                         }else{
00839                             if(x==0 && leftcol){
00840                                 pred= ptr[-linesize];
00841                             }else{
00842                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
00843                             }
00844                         }
00845 
00846                         if (s->interlaced && s->bottom_field)
00847                             ptr += linesize >> 1;
00848                         pred &= (-1)<<(8-s->bits);
00849                         *ptr= pred + (dc << point_transform);
00850                         }else{
00851                             ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
00852                             if(y==0 && toprow){
00853                                 if(x==0 && leftcol){
00854                                     pred= 1 << (bits - 1);
00855                                 }else{
00856                                     pred= ptr16[-1];
00857                                 }
00858                             }else{
00859                                 if(x==0 && leftcol){
00860                                     pred= ptr16[-linesize];
00861                                 }else{
00862                                     PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
00863                                 }
00864                             }
00865 
00866                             if (s->interlaced && s->bottom_field)
00867                                 ptr16 += linesize >> 1;
00868                             pred &= (-1)<<(16-s->bits);
00869                             *ptr16= pred + (dc << point_transform);
00870                         }
00871                         if (++x == h) {
00872                             x = 0;
00873                             y++;
00874                         }
00875                     }
00876                 }
00877             } else {
00878                 for (i = 0; i < nb_components; i++) {
00879                     uint8_t *ptr;
00880                     uint16_t *ptr16;
00881                     int n, h, v, x, y, c, j, linesize, dc;
00882                     n        = s->nb_blocks[i];
00883                     c        = s->comp_index[i];
00884                     h        = s->h_scount[i];
00885                     v        = s->v_scount[i];
00886                     x        = 0;
00887                     y        = 0;
00888                     linesize = s->linesize[c];
00889 
00890                     if(bits>8) linesize /= 2;
00891 
00892                     for (j = 0; j < n; j++) {
00893                         int pred;
00894 
00895                         dc = mjpeg_decode_dc(s, s->dc_index[i]);
00896                         if(dc == 0xFFFF)
00897                             return -1;
00898                         if(bits<=8){
00899                             ptr = s->picture.data[c] +
00900                               (linesize * (v * mb_y + y)) +
00901                               (h * mb_x + x); //FIXME optimize this crap
00902                             PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
00903 
00904                             pred &= (-1)<<(8-s->bits);
00905                             *ptr = pred + (dc << point_transform);
00906                         }else{
00907                             ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
00908                             PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
00909 
00910                             pred &= (-1)<<(16-s->bits);
00911                             *ptr16= pred + (dc << point_transform);
00912                         }
00913 
00914                         if (++x == h) {
00915                             x = 0;
00916                             y++;
00917                         }
00918                     }
00919                 }
00920             }
00921             if (s->restart_interval && !--s->restart_count) {
00922                 align_get_bits(&s->gb);
00923                 skip_bits(&s->gb, 16); /* skip RSTn */
00924             }
00925         }
00926     }
00927     return 0;
00928 }
00929 
00930 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
00931                                               int linesize, int lowres)
00932 {
00933     switch (lowres) {
00934     case 0: copy_block8(dst, src, linesize, linesize, 8);
00935         break;
00936     case 1: copy_block4(dst, src, linesize, linesize, 4);
00937         break;
00938     case 2: copy_block2(dst, src, linesize, linesize, 2);
00939         break;
00940     case 3: *dst = *src;
00941         break;
00942     }
00943 }
00944 
00945 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
00946                              int Al, const uint8_t *mb_bitmask,
00947                              const AVFrame *reference)
00948 {
00949     int i, mb_x, mb_y;
00950     uint8_t *data[MAX_COMPONENTS];
00951     const uint8_t *reference_data[MAX_COMPONENTS];
00952     int linesize[MAX_COMPONENTS];
00953     GetBitContext mb_bitmask_gb;
00954 
00955     if (mb_bitmask)
00956         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00957 
00958     if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
00959         av_log(s->avctx, AV_LOG_ERROR,
00960                "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
00961         s->flipped = 0;
00962     }
00963 
00964     for (i = 0; i < nb_components; i++) {
00965         int c   = s->comp_index[i];
00966         data[c] = s->picture_ptr->data[c];
00967         reference_data[c] = reference ? reference->data[c] : NULL;
00968         linesize[c] = s->linesize[c];
00969         s->coefs_finished[c] |= 1;
00970         if (s->flipped) {
00971             // picture should be flipped upside-down for this codec
00972             int offset = (linesize[c] * (s->v_scount[i] *
00973                          (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
00974             data[c]           += offset;
00975             reference_data[c] += offset;
00976             linesize[c]       *= -1;
00977         }
00978     }
00979 
00980     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00981         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00982             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
00983 
00984             if (s->restart_interval && !s->restart_count)
00985                 s->restart_count = s->restart_interval;
00986 
00987             if (get_bits_left(&s->gb) < 0) {
00988                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
00989                        -get_bits_left(&s->gb));
00990                 return -1;
00991             }
00992             for (i = 0; i < nb_components; i++) {
00993                 uint8_t *ptr;
00994                 int n, h, v, x, y, c, j;
00995                 int block_offset;
00996                 n = s->nb_blocks[i];
00997                 c = s->comp_index[i];
00998                 h = s->h_scount[i];
00999                 v = s->v_scount[i];
01000                 x = 0;
01001                 y = 0;
01002                 for (j = 0; j < n; j++) {
01003                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
01004                                      (h * mb_x + x) * 8) >> s->avctx->lowres);
01005 
01006                     if (s->interlaced && s->bottom_field)
01007                         block_offset += linesize[c] >> 1;
01008                     ptr = data[c] + block_offset;
01009                     if (!s->progressive) {
01010                         if (copy_mb)
01011                             mjpeg_copy_block(ptr, reference_data[c] + block_offset,
01012                                              linesize[c], s->avctx->lowres);
01013                         else {
01014                             s->dsp.clear_block(s->block);
01015                             if (decode_block(s, s->block, i,
01016                                              s->dc_index[i], s->ac_index[i],
01017                                              s->quant_matrixes[s->quant_index[c]]) < 0) {
01018                                 av_log(s->avctx, AV_LOG_ERROR,
01019                                        "error y=%d x=%d\n", mb_y, mb_x);
01020                                 return -1;
01021                             }
01022                             s->dsp.idct_put(ptr, linesize[c], s->block);
01023                         }
01024                     } else {
01025                         int block_idx  = s->block_stride[c] * (v * mb_y + y) +
01026                                          (h * mb_x + x);
01027                         DCTELEM *block = s->blocks[c][block_idx];
01028                         if (Ah)
01029                             block[0] += get_bits1(&s->gb) *
01030                                         s->quant_matrixes[s->quant_index[c]][0] << Al;
01031                         else if (decode_dc_progressive(s, block, i, s->dc_index[i],
01032                                                        s->quant_matrixes[s->quant_index[c]],
01033                                                        Al) < 0) {
01034                             av_log(s->avctx, AV_LOG_ERROR,
01035                                    "error y=%d x=%d\n", mb_y, mb_x);
01036                             return -1;
01037                         }
01038                     }
01039                     // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
01040                     //        mb_y, mb_x);
01041                     // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
01042                     //        mb_x, mb_y, x, y, c, s->bottom_field,
01043                     //        (v * mb_y + y) * 8, (h * mb_x + x) * 8);
01044                     if (++x == h) {
01045                         x = 0;
01046                         y++;
01047                     }
01048                 }
01049             }
01050 
01051             if (s->restart_interval) {
01052                 s->restart_count--;
01053                 if(s->restart_count == 0 && s->avctx->codec_id == CODEC_ID_THP){
01054                     align_get_bits(&s->gb);
01055                     for (i = 0; i < nb_components; i++) /* reset dc */
01056                         s->last_dc[i] = 1024;
01057                 }
01058 
01059                 i = 8 + ((-get_bits_count(&s->gb)) & 7);
01060                 /* skip RSTn */
01061                 if (show_bits(&s->gb, i) == (1 << i) - 1) {
01062                     int pos = get_bits_count(&s->gb);
01063                     align_get_bits(&s->gb);
01064                     while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
01065                         skip_bits(&s->gb, 8);
01066                     if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
01067                         for (i = 0; i < nb_components; i++) /* reset dc */
01068                             s->last_dc[i] = 1024;
01069                     } else
01070                         skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
01071                 }
01072             }
01073         }
01074     }
01075     return 0;
01076 }
01077 
01078 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
01079                                             int se, int Ah, int Al)
01080 {
01081     int mb_x, mb_y;
01082     int EOBRUN = 0;
01083     int c = s->comp_index[0];
01084     uint8_t *data = s->picture.data[c];
01085     int linesize  = s->linesize[c];
01086     int last_scan = 0;
01087     int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
01088 
01089     if (!Al) {
01090         s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
01091         last_scan = !~s->coefs_finished[c];
01092     }
01093 
01094     if (s->interlaced && s->bottom_field)
01095         data += linesize >> 1;
01096 
01097     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
01098         uint8_t *ptr     = data + (mb_y * linesize * 8 >> s->avctx->lowres);
01099         int block_idx    = mb_y * s->block_stride[c];
01100         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
01101         uint8_t *last_nnz    = &s->last_nnz[c][block_idx];
01102         for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
01103                 int ret;
01104                 if (Ah)
01105                     ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
01106                                                   quant_matrix, ss, se, Al, &EOBRUN);
01107                 else
01108                     ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
01109                                                    quant_matrix, ss, se, Al, &EOBRUN);
01110                 if (ret < 0) {
01111                     av_log(s->avctx, AV_LOG_ERROR,
01112                            "error y=%d x=%d\n", mb_y, mb_x);
01113                     return -1;
01114                 }
01115 
01116             if (last_scan) {
01117                     s->dsp.idct_put(ptr, linesize, *block);
01118                     ptr += 8 >> s->avctx->lowres;
01119             }
01120         }
01121     }
01122     return 0;
01123 }
01124 
01125 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
01126                         const AVFrame *reference)
01127 {
01128     int len, nb_components, i, h, v, predictor, point_transform;
01129     int index, id;
01130     const int block_size = s->lossless ? 1 : 8;
01131     int ilv, prev_shift;
01132 
01133     /* XXX: verify len field validity */
01134     len = get_bits(&s->gb, 16);
01135     nb_components = get_bits(&s->gb, 8);
01136     if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
01137         av_log(s->avctx, AV_LOG_ERROR,
01138                "decode_sos: nb_components (%d) unsupported\n", nb_components);
01139         return -1;
01140     }
01141     if (len != 6 + 2 * nb_components) {
01142         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
01143         return -1;
01144     }
01145     for (i = 0; i < nb_components; i++) {
01146         id = get_bits(&s->gb, 8) - 1;
01147         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
01148         /* find component index */
01149         for (index = 0; index < s->nb_components; index++)
01150             if (id == s->component_id[index])
01151                 break;
01152         if (index == s->nb_components) {
01153             av_log(s->avctx, AV_LOG_ERROR,
01154                    "decode_sos: index(%d) out of components\n", index);
01155             return -1;
01156         }
01157         /* Metasoft MJPEG codec has Cb and Cr swapped */
01158         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
01159             && nb_components == 3 && s->nb_components == 3 && i)
01160             index = 3 - i;
01161 
01162         if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
01163             index = (i+2)%3;
01164 
01165         s->comp_index[i] = index;
01166 
01167         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
01168         s->h_scount[i]  = s->h_count[index];
01169         s->v_scount[i]  = s->v_count[index];
01170 
01171         s->dc_index[i] = get_bits(&s->gb, 4);
01172         s->ac_index[i] = get_bits(&s->gb, 4);
01173 
01174         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
01175             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
01176             goto out_of_range;
01177         if (!s->vlcs[0][s->dc_index[i]].table || !(s->progressive ? s->vlcs[2][s->ac_index[0]].table : s->vlcs[1][s->ac_index[i]].table))
01178             goto out_of_range;
01179     }
01180 
01181     predictor = get_bits(&s->gb, 8);       /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
01182     ilv = get_bits(&s->gb, 8);             /* JPEG Se / JPEG-LS ILV */
01183     if(s->avctx->codec_tag != AV_RL32("CJPG")){
01184         prev_shift      = get_bits(&s->gb, 4); /* Ah */
01185         point_transform = get_bits(&s->gb, 4); /* Al */
01186     }else
01187         prev_shift = point_transform = 0;
01188 
01189     for (i = 0; i < nb_components; i++)
01190         s->last_dc[i] = 1024;
01191 
01192     if (nb_components > 1) {
01193         /* interleaved stream */
01194         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
01195         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
01196     } else if (!s->ls) { /* skip this for JPEG-LS */
01197         h = s->h_max / s->h_scount[0];
01198         v = s->v_max / s->v_scount[0];
01199         s->mb_width     = (s->width  + h * block_size - 1) / (h * block_size);
01200         s->mb_height    = (s->height + v * block_size - 1) / (v * block_size);
01201         s->nb_blocks[0] = 1;
01202         s->h_scount[0]  = 1;
01203         s->v_scount[0]  = 1;
01204     }
01205 
01206     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01207         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
01208                s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
01209                predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
01210                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
01211 
01212 
01213     /* mjpeg-b can have padding bytes between sos and image data, skip them */
01214     for (i = s->mjpb_skiptosod; i > 0; i--)
01215         skip_bits(&s->gb, 8);
01216 
01217     if (s->lossless) {
01218         av_assert0(s->picture_ptr == &s->picture);
01219         if (CONFIG_JPEGLS_DECODER && s->ls) {
01220 //            for () {
01221 //            reset_ls_coding_parameters(s, 0);
01222 
01223             if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
01224                 return -1;
01225         } else {
01226             if (s->rgb) {
01227                 if (ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform) < 0)
01228                     return -1;
01229             } else {
01230                 if (ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
01231                     return -1;
01232             }
01233         }
01234     } else {
01235         if (s->progressive && predictor) {
01236             av_assert0(s->picture_ptr == &s->picture);
01237             if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
01238                                                  point_transform) < 0)
01239                 return -1;
01240         } else {
01241             if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
01242                                   mb_bitmask, reference) < 0)
01243                 return -1;
01244         }
01245     }
01246     emms_c();
01247     return 0;
01248  out_of_range:
01249     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
01250     return -1;
01251 }
01252 
01253 static int mjpeg_decode_dri(MJpegDecodeContext *s)
01254 {
01255     if (get_bits(&s->gb, 16) != 4)
01256         return -1;
01257     s->restart_interval = get_bits(&s->gb, 16);
01258     s->restart_count    = 0;
01259     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
01260            s->restart_interval);
01261 
01262     return 0;
01263 }
01264 
01265 static int mjpeg_decode_app(MJpegDecodeContext *s)
01266 {
01267     int len, id, i;
01268 
01269     len = get_bits(&s->gb, 16);
01270     if (len < 5)
01271         return -1;
01272     if (8 * len > get_bits_left(&s->gb))
01273         return -1;
01274 
01275     id   = get_bits_long(&s->gb, 32);
01276     id   = av_be2ne32(id);
01277     len -= 6;
01278 
01279     if (s->avctx->debug & FF_DEBUG_STARTCODE)
01280         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
01281 
01282     /* Buggy AVID, it puts EOI only at every 10th frame. */
01283     /* Also, this fourcc is used by non-avid files too, it holds some
01284        information, but it's always present in AVID-created files. */
01285     if (id == AV_RL32("AVI1")) {
01286         /* structure:
01287             4bytes      AVI1
01288             1bytes      polarity
01289             1bytes      always zero
01290             4bytes      field_size
01291             4bytes      field_size_less_padding
01292         */
01293             s->buggy_avid = 1;
01294 //        if (s->first_picture)
01295 //            printf("mjpeg: workarounding buggy AVID\n");
01296         i = get_bits(&s->gb, 8); len--;
01297         av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
01298 #if 0
01299         skip_bits(&s->gb, 8);
01300         skip_bits(&s->gb, 32);
01301         skip_bits(&s->gb, 32);
01302         len -= 10;
01303 #endif
01304 //        if (s->interlace_polarity)
01305 //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
01306         goto out;
01307     }
01308 
01309 //    len -= 2;
01310 
01311     if (id == AV_RL32("JFIF")) {
01312         int t_w, t_h, v1, v2;
01313         skip_bits(&s->gb, 8); /* the trailing zero-byte */
01314         v1 = get_bits(&s->gb, 8);
01315         v2 = get_bits(&s->gb, 8);
01316         skip_bits(&s->gb, 8);
01317 
01318         s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
01319         s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
01320 
01321         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01322             av_log(s->avctx, AV_LOG_INFO,
01323                    "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
01324                    v1, v2,
01325                    s->avctx->sample_aspect_ratio.num,
01326                    s->avctx->sample_aspect_ratio.den);
01327 
01328         t_w = get_bits(&s->gb, 8);
01329         t_h = get_bits(&s->gb, 8);
01330         if (t_w && t_h) {
01331             /* skip thumbnail */
01332             if (len -10 - (t_w * t_h * 3) > 0)
01333                 len -= t_w * t_h * 3;
01334         }
01335         len -= 10;
01336         goto out;
01337     }
01338 
01339     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
01340         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01341             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
01342         skip_bits(&s->gb, 16); /* version */
01343         skip_bits(&s->gb, 16); /* flags0 */
01344         skip_bits(&s->gb, 16); /* flags1 */
01345         skip_bits(&s->gb,  8); /* transform */
01346         len -= 7;
01347         goto out;
01348     }
01349 
01350     if (id == AV_RL32("LJIF")) {
01351         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01352             av_log(s->avctx, AV_LOG_INFO,
01353                    "Pegasus lossless jpeg header found\n");
01354         skip_bits(&s->gb, 16); /* version ? */
01355         skip_bits(&s->gb, 16); /* unknwon always 0? */
01356         skip_bits(&s->gb, 16); /* unknwon always 0? */
01357         skip_bits(&s->gb, 16); /* unknwon always 0? */
01358         switch (get_bits(&s->gb, 8)) {
01359         case 1:
01360             s->rgb         = 1;
01361             s->pegasus_rct = 0;
01362             break;
01363         case 2:
01364             s->rgb         = 1;
01365             s->pegasus_rct = 1;
01366             break;
01367         default:
01368             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
01369         }
01370         len -= 9;
01371         goto out;
01372     }
01373 
01374     /* Apple MJPEG-A */
01375     if ((s->start_code == APP1) && (len > (0x28 - 8))) {
01376         id   = get_bits_long(&s->gb, 32);
01377         id   = av_be2ne32(id);
01378         len -= 4;
01379         /* Apple MJPEG-A */
01380         if (id == AV_RL32("mjpg")) {
01381 #if 0
01382             skip_bits(&s->gb, 32); /* field size */
01383             skip_bits(&s->gb, 32); /* pad field size */
01384             skip_bits(&s->gb, 32); /* next off */
01385             skip_bits(&s->gb, 32); /* quant off */
01386             skip_bits(&s->gb, 32); /* huff off */
01387             skip_bits(&s->gb, 32); /* image off */
01388             skip_bits(&s->gb, 32); /* scan off */
01389             skip_bits(&s->gb, 32); /* data off */
01390 #endif
01391             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01392                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
01393         }
01394     }
01395 
01396 out:
01397     /* slow but needed for extreme adobe jpegs */
01398     if (len < 0)
01399         av_log(s->avctx, AV_LOG_ERROR,
01400                "mjpeg: error, decode_app parser read over the end\n");
01401     while (--len > 0)
01402         skip_bits(&s->gb, 8);
01403 
01404     return 0;
01405 }
01406 
01407 static int mjpeg_decode_com(MJpegDecodeContext *s)
01408 {
01409     int len = get_bits(&s->gb, 16);
01410     if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
01411         char *cbuf = av_malloc(len - 1);
01412         if (cbuf) {
01413             int i;
01414             for (i = 0; i < len - 2; i++)
01415                 cbuf[i] = get_bits(&s->gb, 8);
01416             if (i > 0 && cbuf[i - 1] == '\n')
01417                 cbuf[i - 1] = 0;
01418             else
01419                 cbuf[i] = 0;
01420 
01421             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01422                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
01423 
01424             /* buggy avid, it puts EOI only at every 10th frame */
01425             if (!strcmp(cbuf, "AVID")) {
01426                 s->buggy_avid = 1;
01427                 // if (s->first_picture)
01428                 // printf("mjpeg: workarounding buggy AVID\n");
01429             } else if (!strcmp(cbuf, "CS=ITU601"))
01430                 s->cs_itu601 = 1;
01431             else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
01432                      (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
01433                 s->flipped = 1;
01434 
01435             av_free(cbuf);
01436         }
01437     }
01438 
01439     return 0;
01440 }
01441 
01442 /* return the 8 bit start code value and update the search
01443    state. Return -1 if no start code found */
01444 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
01445 {
01446     const uint8_t *buf_ptr;
01447     unsigned int v, v2;
01448     int val;
01449     int skipped = 0;
01450 
01451     buf_ptr = *pbuf_ptr;
01452     while (buf_ptr < buf_end) {
01453         v  = *buf_ptr++;
01454         v2 = *buf_ptr;
01455         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
01456             val = *buf_ptr++;
01457             goto found;
01458         }
01459         skipped++;
01460     }
01461     val = -1;
01462 found:
01463     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
01464     *pbuf_ptr = buf_ptr;
01465     return val;
01466 }
01467 
01468 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
01469                          const uint8_t **buf_ptr, const uint8_t *buf_end,
01470                          const uint8_t **unescaped_buf_ptr,
01471                          int *unescaped_buf_size)
01472 {
01473     int start_code;
01474     start_code = find_marker(buf_ptr, buf_end);
01475 
01476     av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
01477     if (!s->buffer)
01478         return AVERROR(ENOMEM);
01479 
01480     /* unescape buffer of SOS, use special treatment for JPEG-LS */
01481     if (start_code == SOS && !s->ls) {
01482         const uint8_t *src = *buf_ptr;
01483         uint8_t *dst = s->buffer;
01484 
01485         while (src < buf_end) {
01486             uint8_t x = *(src++);
01487 
01488             *(dst++) = x;
01489             if (s->avctx->codec_id != CODEC_ID_THP) {
01490                 if (x == 0xff) {
01491                     while (src < buf_end && x == 0xff)
01492                         x = *(src++);
01493 
01494                     if (x >= 0xd0 && x <= 0xd7)
01495                         *(dst++) = x;
01496                     else if (x)
01497                         break;
01498                 }
01499             }
01500         }
01501         *unescaped_buf_ptr  = s->buffer;
01502         *unescaped_buf_size = dst - s->buffer;
01503 
01504         av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
01505                (buf_end - *buf_ptr) - (dst - s->buffer));
01506     } else if (start_code == SOS && s->ls) {
01507         const uint8_t *src = *buf_ptr;
01508         uint8_t *dst  = s->buffer;
01509         int bit_count = 0;
01510         int t = 0, b = 0;
01511         PutBitContext pb;
01512 
01513         s->cur_scan++;
01514 
01515         /* find marker */
01516         while (src + t < buf_end) {
01517             uint8_t x = src[t++];
01518             if (x == 0xff) {
01519                 while ((src + t < buf_end) && x == 0xff)
01520                     x = src[t++];
01521                 if (x & 0x80) {
01522                     t -= 2;
01523                     break;
01524                 }
01525             }
01526         }
01527         bit_count = t * 8;
01528         init_put_bits(&pb, dst, t);
01529 
01530         /* unescape bitstream */
01531         while (b < t) {
01532             uint8_t x = src[b++];
01533             put_bits(&pb, 8, x);
01534             if (x == 0xFF) {
01535                 x = src[b++];
01536                 put_bits(&pb, 7, x);
01537                 bit_count--;
01538             }
01539         }
01540         flush_put_bits(&pb);
01541 
01542         *unescaped_buf_ptr  = dst;
01543         *unescaped_buf_size = (bit_count + 7) >> 3;
01544     } else {
01545         *unescaped_buf_ptr  = *buf_ptr;
01546         *unescaped_buf_size = buf_end - *buf_ptr;
01547     }
01548 
01549     return start_code;
01550 }
01551 
01552 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
01553                           AVPacket *avpkt)
01554 {
01555     const uint8_t *buf = avpkt->data;
01556     int buf_size       = avpkt->size;
01557     MJpegDecodeContext *s = avctx->priv_data;
01558     const uint8_t *buf_end, *buf_ptr;
01559     const uint8_t *unescaped_buf_ptr;
01560     int unescaped_buf_size;
01561     int start_code;
01562     int i, index;
01563     AVFrame *picture = data;
01564 
01565     s->got_picture = 0; // picture from previous image can not be reused
01566     buf_ptr = buf;
01567     buf_end = buf + buf_size;
01568     while (buf_ptr < buf_end) {
01569         /* find start next marker */
01570         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
01571                                           &unescaped_buf_ptr,
01572                                           &unescaped_buf_size);
01573         /* EOF */
01574         if (start_code < 0) {
01575             goto the_end;
01576         } else if (unescaped_buf_size > (1U<<29)) {
01577             av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
01578                    start_code, unescaped_buf_ptr, buf_size);
01579             return AVERROR_INVALIDDATA;
01580         } else {
01581             av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
01582                    start_code, buf_end - buf_ptr);
01583 
01584             init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
01585 
01586             s->start_code = start_code;
01587             if (s->avctx->debug & FF_DEBUG_STARTCODE)
01588                 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
01589 
01590             /* process markers */
01591             if (start_code >= 0xd0 && start_code <= 0xd7)
01592                 av_log(avctx, AV_LOG_DEBUG,
01593                        "restart marker: %d\n", start_code & 0x0f);
01594                 /* APP fields */
01595             else if (start_code >= APP0 && start_code <= APP15)
01596                 mjpeg_decode_app(s);
01597                 /* Comment */
01598             else if (start_code == COM)
01599                 mjpeg_decode_com(s);
01600 
01601             switch (start_code) {
01602             case SOI:
01603                 s->restart_interval = 0;
01604                 s->restart_count    = 0;
01605                 /* nothing to do on SOI */
01606                 break;
01607             case DQT:
01608                 ff_mjpeg_decode_dqt(s);
01609                 break;
01610             case DHT:
01611                 if (ff_mjpeg_decode_dht(s) < 0) {
01612                     av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
01613                     return -1;
01614                 }
01615                 break;
01616             case SOF0:
01617             case SOF1:
01618                 s->lossless    = 0;
01619                 s->ls          = 0;
01620                 s->progressive = 0;
01621                 if (ff_mjpeg_decode_sof(s) < 0)
01622                     return -1;
01623                 break;
01624             case SOF2:
01625                 s->lossless    = 0;
01626                 s->ls          = 0;
01627                 s->progressive = 1;
01628                 if (ff_mjpeg_decode_sof(s) < 0)
01629                     return -1;
01630                 break;
01631             case SOF3:
01632                 s->lossless    = 1;
01633                 s->ls          = 0;
01634                 s->progressive = 0;
01635                 if (ff_mjpeg_decode_sof(s) < 0)
01636                     return -1;
01637                 break;
01638             case SOF48:
01639                 s->lossless    = 1;
01640                 s->ls          = 1;
01641                 s->progressive = 0;
01642                 if (ff_mjpeg_decode_sof(s) < 0)
01643                     return -1;
01644                 break;
01645             case LSE:
01646                 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
01647                     return -1;
01648                 break;
01649             case EOI:
01650 eoi_parser:
01651                 s->cur_scan = 0;
01652                 if (!s->got_picture) {
01653                     av_log(avctx, AV_LOG_WARNING,
01654                            "Found EOI before any SOF, ignoring\n");
01655                     break;
01656                 }
01657                 if (s->interlaced) {
01658                     s->bottom_field ^= 1;
01659                     /* if not bottom field, do not output image yet */
01660                     if (s->bottom_field == !s->interlace_polarity)
01661                         break;
01662                 }
01663                     *picture   = *s->picture_ptr;
01664                     *data_size = sizeof(AVFrame);
01665 
01666                     if (!s->lossless) {
01667                         picture->quality      = FFMAX3(s->qscale[0],
01668                                                        s->qscale[1],
01669                                                        s->qscale[2]);
01670                         picture->qstride      = 0;
01671                         picture->qscale_table = s->qscale_table;
01672                         memset(picture->qscale_table, picture->quality,
01673                                (s->width + 15) / 16);
01674                         if (avctx->debug & FF_DEBUG_QP)
01675                             av_log(avctx, AV_LOG_DEBUG,
01676                                    "QP: %d\n", picture->quality);
01677                         picture->quality *= FF_QP2LAMBDA;
01678                     }
01679 
01680                 goto the_end;
01681             case SOS:
01682                 if (!s->got_picture) {
01683                     av_log(avctx, AV_LOG_WARNING,
01684                            "Can not process SOS before SOF, skipping\n");
01685                     break;
01686                     }
01687                 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
01688                     (avctx->err_recognition & AV_EF_EXPLODE))
01689                     return AVERROR_INVALIDDATA;
01690                 break;
01691             case DRI:
01692                 mjpeg_decode_dri(s);
01693                 break;
01694             case SOF5:
01695             case SOF6:
01696             case SOF7:
01697             case SOF9:
01698             case SOF10:
01699             case SOF11:
01700             case SOF13:
01701             case SOF14:
01702             case SOF15:
01703             case JPG:
01704                 av_log(avctx, AV_LOG_ERROR,
01705                        "mjpeg: unsupported coding type (%x)\n", start_code);
01706                 break;
01707 //              default:
01708 //              printf("mjpeg: unsupported marker (%x)\n", start_code);
01709 //              break;
01710             }
01711 
01712             /* eof process start code */
01713             buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
01714             av_log(avctx, AV_LOG_DEBUG,
01715                    "marker parser used %d bytes (%d bits)\n",
01716                    (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
01717         }
01718     }
01719     if (s->got_picture) {
01720         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
01721         goto eoi_parser;
01722     }
01723     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
01724     return -1;
01725 the_end:
01726     if (s->upscale_h) {
01727         uint8_t *line = s->picture_ptr->data[s->upscale_h];
01728         av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
01729                    avctx->pix_fmt == PIX_FMT_YUV444P  ||
01730                    avctx->pix_fmt == PIX_FMT_YUVJ440P ||
01731                    avctx->pix_fmt == PIX_FMT_YUV440P);
01732         for (i = 0; i < s->chroma_height; i++) {
01733             for (index = s->width - 1; index; index--)
01734                 line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
01735             line += s->linesize[s->upscale_h];
01736         }
01737     }
01738     if (s->upscale_v) {
01739         uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
01740         av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
01741                    avctx->pix_fmt == PIX_FMT_YUV444P  ||
01742                    avctx->pix_fmt == PIX_FMT_YUVJ422P ||
01743                    avctx->pix_fmt == PIX_FMT_YUV422P);
01744         for (i = s->height - 1; i; i--) {
01745             uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
01746             uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
01747             if (src1 == src2) {
01748                 memcpy(dst, src1, s->width);
01749             } else {
01750                 for (index = 0; index < s->width; index++)
01751                     dst[index] = (src1[index] + src2[index]) >> 1;
01752             }
01753             dst -= s->linesize[s->upscale_v];
01754         }
01755     }
01756     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
01757            buf_end - buf_ptr);
01758 //  return buf_end - buf_ptr;
01759     return buf_ptr - buf;
01760 }
01761 
01762 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
01763 {
01764     MJpegDecodeContext *s = avctx->priv_data;
01765     int i, j;
01766 
01767     if (s->picture_ptr && s->picture_ptr->data[0])
01768         avctx->release_buffer(avctx, s->picture_ptr);
01769 
01770     av_free(s->buffer);
01771     av_free(s->qscale_table);
01772     av_freep(&s->ljpeg_buffer);
01773     s->ljpeg_buffer_size = 0;
01774 
01775     for (i = 0; i < 3; i++) {
01776         for (j = 0; j < 4; j++)
01777             free_vlc(&s->vlcs[i][j]);
01778     }
01779     for (i = 0; i < MAX_COMPONENTS; i++) {
01780         av_freep(&s->blocks[i]);
01781         av_freep(&s->last_nnz[i]);
01782     }
01783     return 0;
01784 }
01785 
01786 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
01787 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
01788 static const AVOption options[] = {
01789     { "extern_huff", "Use external huffman table.",
01790       OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
01791     { NULL },
01792 };
01793 
01794 static const AVClass mjpegdec_class = {
01795     .class_name = "MJPEG decoder",
01796     .item_name  = av_default_item_name,
01797     .option     = options,
01798     .version    = LIBAVUTIL_VERSION_INT,
01799 };
01800 
01801 AVCodec ff_mjpeg_decoder = {
01802     .name           = "mjpeg",
01803     .type           = AVMEDIA_TYPE_VIDEO,
01804     .id             = CODEC_ID_MJPEG,
01805     .priv_data_size = sizeof(MJpegDecodeContext),
01806     .init           = ff_mjpeg_decode_init,
01807     .close          = ff_mjpeg_decode_end,
01808     .decode         = ff_mjpeg_decode_frame,
01809     .capabilities   = CODEC_CAP_DR1,
01810     .max_lowres     = 3,
01811     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
01812     .priv_class     = &mjpegdec_class,
01813 };
01814 
01815 AVCodec ff_thp_decoder = {
01816     .name           = "thp",
01817     .type           = AVMEDIA_TYPE_VIDEO,
01818     .id             = CODEC_ID_THP,
01819     .priv_data_size = sizeof(MJpegDecodeContext),
01820     .init           = ff_mjpeg_decode_init,
01821     .close          = ff_mjpeg_decode_end,
01822     .decode         = ff_mjpeg_decode_frame,
01823     .capabilities   = CODEC_CAP_DR1,
01824     .max_lowres     = 3,
01825     .long_name      = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
01826 };