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