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 Libav.
00012  *
00013  * Libav 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  * Libav 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 Libav; 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/opt.h"
00038 #include "avcodec.h"
00039 #include "dsputil.h"
00040 #include "mjpeg.h"
00041 #include "mjpegdec.h"
00042 #include "jpeglsdec.h"
00043 
00044 
00045 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
00046                      const uint8_t *val_table, int nb_codes,
00047                      int use_static, int is_ac)
00048 {
00049     uint8_t huff_size[256];
00050     uint16_t huff_code[256];
00051     uint16_t huff_sym[256];
00052     int i;
00053 
00054     assert(nb_codes <= 256);
00055 
00056     memset(huff_size, 0, sizeof(huff_size));
00057     ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
00058 
00059     for (i = 0; i < 256; i++)
00060         huff_sym[i] = i + 16 * is_ac;
00061 
00062     if (is_ac)
00063         huff_sym[0] = 16 * 256;
00064 
00065     return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
00066                               huff_code, 2, 2, huff_sym, 2, 2, use_static);
00067 }
00068 
00069 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
00070 {
00071     build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
00072               ff_mjpeg_val_dc, 12, 0, 0);
00073     build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
00074               ff_mjpeg_val_dc, 12, 0, 0);
00075     build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
00076               ff_mjpeg_val_ac_luminance, 251, 0, 1);
00077     build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
00078               ff_mjpeg_val_ac_chrominance, 251, 0, 1);
00079     build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
00080               ff_mjpeg_val_ac_luminance, 251, 0, 0);
00081     build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
00082               ff_mjpeg_val_ac_chrominance, 251, 0, 0);
00083 }
00084 
00085 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
00086 {
00087     MJpegDecodeContext *s = avctx->priv_data;
00088 
00089     if (!s->picture_ptr)
00090         s->picture_ptr = &s->picture;
00091 
00092     s->avctx = avctx;
00093     dsputil_init(&s->dsp, avctx);
00094     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
00095     s->buffer_size   = 0;
00096     s->buffer        = NULL;
00097     s->start_code    = -1;
00098     s->first_picture = 1;
00099     s->org_height    = avctx->coded_height;
00100     avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
00101 
00102     build_basic_mjpeg_vlc(s);
00103 
00104 #if FF_API_MJPEG_GLOBAL_OPTS
00105     if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
00106         s->extern_huff = 1;
00107 #endif
00108     if (s->extern_huff) {
00109         av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
00110         init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
00111         if (ff_mjpeg_decode_dht(s)) {
00112             av_log(avctx, AV_LOG_ERROR,
00113                    "mjpeg: error using external huffman table\n");
00114             return AVERROR_INVALIDDATA;
00115         }
00116     }
00117     if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
00118         s->interlace_polarity = 1;           /* bottom field first */
00119         av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
00120     }
00121     if (avctx->codec->id == CODEC_ID_AMV)
00122         s->flipped = 1;
00123 
00124     return 0;
00125 }
00126 
00127 
00128 /* quantize tables */
00129 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
00130 {
00131     int len, index, i, j;
00132 
00133     len = get_bits(&s->gb, 16) - 2;
00134 
00135     while (len >= 65) {
00136         /* only 8 bit precision handled */
00137         if (get_bits(&s->gb, 4) != 0) {
00138             av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
00139             return -1;
00140         }
00141         index = get_bits(&s->gb, 4);
00142         if (index >= 4)
00143             return -1;
00144         av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
00145         /* read quant table */
00146         for (i = 0; i < 64; i++) {
00147             j = s->scantable.permutated[i];
00148             s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
00149         }
00150 
00151         // XXX FIXME finetune, and perhaps add dc too
00152         s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
00153                                  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
00154         av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
00155                index, s->qscale[index]);
00156         len -= 65;
00157     }
00158     return 0;
00159 }
00160 
00161 /* decode huffman tables and build VLC decoders */
00162 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
00163 {
00164     int len, index, i, class, n, v, code_max;
00165     uint8_t bits_table[17];
00166     uint8_t val_table[256];
00167 
00168     len = get_bits(&s->gb, 16) - 2;
00169 
00170     while (len > 0) {
00171         if (len < 17)
00172             return -1;
00173         class = get_bits(&s->gb, 4);
00174         if (class >= 2)
00175             return -1;
00176         index = get_bits(&s->gb, 4);
00177         if (index >= 4)
00178             return -1;
00179         n = 0;
00180         for (i = 1; i <= 16; i++) {
00181             bits_table[i] = get_bits(&s->gb, 8);
00182             n += bits_table[i];
00183         }
00184         len -= 17;
00185         if (len < n || n > 256)
00186             return -1;
00187 
00188         code_max = 0;
00189         for (i = 0; i < n; i++) {
00190             v = get_bits(&s->gb, 8);
00191             if (v > code_max)
00192                 code_max = v;
00193             val_table[i] = v;
00194         }
00195         len -= n;
00196 
00197         /* build VLC and flush previous vlc if present */
00198         ff_free_vlc(&s->vlcs[class][index]);
00199         av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
00200                class, index, code_max + 1);
00201         if (build_vlc(&s->vlcs[class][index], bits_table, val_table,
00202                       code_max + 1, 0, class > 0) < 0)
00203             return -1;
00204 
00205         if (class > 0) {
00206             ff_free_vlc(&s->vlcs[2][index]);
00207             if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
00208                           code_max + 1, 0, 0) < 0)
00209                 return -1;
00210         }
00211     }
00212     return 0;
00213 }
00214 
00215 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
00216 {
00217     int len, nb_components, i, width, height, pix_fmt_id;
00218 
00219     /* XXX: verify len field validity */
00220     len     = get_bits(&s->gb, 16);
00221     s->bits = get_bits(&s->gb, 8);
00222 
00223     if (s->pegasus_rct)
00224         s->bits = 9;
00225     if (s->bits == 9 && !s->pegasus_rct)
00226         s->rct  = 1;    // FIXME ugly
00227 
00228     if (s->bits != 8 && !s->lossless) {
00229         av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
00230         return -1;
00231     }
00232 
00233     height = get_bits(&s->gb, 16);
00234     width  = get_bits(&s->gb, 16);
00235 
00236     // HACK for odd_height.mov
00237     if (s->interlaced && s->width == width && s->height == height + 1)
00238         height= s->height;
00239 
00240     av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
00241     if (av_image_check_size(width, height, 0, s->avctx))
00242         return -1;
00243 
00244     nb_components = get_bits(&s->gb, 8);
00245     if (nb_components <= 0 ||
00246         nb_components > MAX_COMPONENTS)
00247         return -1;
00248     if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
00249         if (nb_components != s->nb_components) {
00250             av_log(s->avctx, AV_LOG_ERROR,
00251                    "nb_components changing in interlaced picture\n");
00252             return AVERROR_INVALIDDATA;
00253         }
00254     }
00255     if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
00256         av_log(s->avctx, AV_LOG_ERROR,
00257                "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
00258         return -1;
00259     }
00260     s->nb_components = nb_components;
00261     s->h_max         = 1;
00262     s->v_max         = 1;
00263     for (i = 0; i < nb_components; i++) {
00264         /* component id */
00265         s->component_id[i] = get_bits(&s->gb, 8) - 1;
00266         s->h_count[i]      = get_bits(&s->gb, 4);
00267         s->v_count[i]      = get_bits(&s->gb, 4);
00268         /* compute hmax and vmax (only used in interleaved case) */
00269         if (s->h_count[i] > s->h_max)
00270             s->h_max = s->h_count[i];
00271         if (s->v_count[i] > s->v_max)
00272             s->v_max = s->v_count[i];
00273         s->quant_index[i] = get_bits(&s->gb, 8);
00274         if (s->quant_index[i] >= 4)
00275             return -1;
00276         if (!s->h_count[i] || !s->v_count[i]) {
00277             av_log(s->avctx, AV_LOG_ERROR,
00278                    "Invalid sampling factor in component %d %d:%d\n",
00279                    i, s->h_count[i], s->v_count[i]);
00280             return AVERROR_INVALIDDATA;
00281         }
00282 
00283         av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
00284                i, s->h_count[i], s->v_count[i],
00285                s->component_id[i], s->quant_index[i]);
00286     }
00287 
00288     if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
00289         av_log(s->avctx, AV_LOG_ERROR,
00290                "Subsampling in JPEG-LS is not supported.\n");
00291         return -1;
00292     }
00293 
00294     if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1)
00295         s->rgb = 1;
00296 
00297     /* if different size, realloc/alloc picture */
00298     /* XXX: also check h_count and v_count */
00299     if (width != s->width || height != s->height) {
00300         av_freep(&s->qscale_table);
00301 
00302         s->width      = width;
00303         s->height     = height;
00304         s->interlaced = 0;
00305 
00306         /* test interlaced mode */
00307         if (s->first_picture   &&
00308             s->org_height != 0 &&
00309             s->height < ((s->org_height * 3) / 4)) {
00310             s->interlaced                    = 1;
00311             s->bottom_field                  = s->interlace_polarity;
00312             s->picture_ptr->interlaced_frame = 1;
00313             s->picture_ptr->top_field_first  = !s->interlace_polarity;
00314             height *= 2;
00315         }
00316 
00317         avcodec_set_dimensions(s->avctx, width, height);
00318 
00319         s->qscale_table  = av_mallocz((s->width + 15) / 16);
00320         s->first_picture = 0;
00321     }
00322 
00323     if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) {
00324     /* XXX: not complete test ! */
00325     pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
00326                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
00327                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
00328                  (s->h_count[3] <<  4) |  s->v_count[3];
00329     av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
00330     /* NOTE we do not allocate pictures large enough for the possible
00331      * padding of h/v_count being 4 */
00332     if (!(pix_fmt_id & 0xD0D0D0D0))
00333         pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
00334     if (!(pix_fmt_id & 0x0D0D0D0D))
00335         pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
00336 
00337     switch (pix_fmt_id) {
00338     case 0x11111100:
00339         if (s->rgb)
00340             s->avctx->pix_fmt = PIX_FMT_BGRA;
00341         else
00342             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00343         assert(s->nb_components == 3);
00344         break;
00345     case 0x11000000:
00346         s->avctx->pix_fmt = PIX_FMT_GRAY8;
00347         break;
00348     case 0x12111100:
00349         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
00350         break;
00351     case 0x21111100:
00352         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
00353         break;
00354     case 0x22111100:
00355         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
00356         break;
00357     default:
00358         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
00359         return -1;
00360     }
00361     if (s->ls) {
00362         if (s->nb_components > 1)
00363             s->avctx->pix_fmt = PIX_FMT_RGB24;
00364         else if (s->bits <= 8)
00365             s->avctx->pix_fmt = PIX_FMT_GRAY8;
00366         else
00367             s->avctx->pix_fmt = PIX_FMT_GRAY16;
00368     }
00369 
00370     if (s->picture_ptr->data[0])
00371         s->avctx->release_buffer(s->avctx, s->picture_ptr);
00372 
00373     if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
00374         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00375         return -1;
00376     }
00377     s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
00378     s->picture_ptr->key_frame = 1;
00379     s->got_picture            = 1;
00380 
00381     for (i = 0; i < 3; i++)
00382         s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
00383 
00384 //    printf("%d %d %d %d %d %d\n",
00385 //           s->width, s->height, s->linesize[0], s->linesize[1],
00386 //           s->interlaced, s->avctx->height);
00387 
00388     if (len != (8 + (3 * nb_components)))
00389         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
00390     }
00391 
00392     /* totally blank picture as progressive JPEG will only add details to it */
00393     if (s->progressive) {
00394         int bw = (width  + s->h_max * 8 - 1) / (s->h_max * 8);
00395         int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
00396         for (i = 0; i < s->nb_components; i++) {
00397             int size = bw * bh * s->h_count[i] * s->v_count[i];
00398             av_freep(&s->blocks[i]);
00399             av_freep(&s->last_nnz[i]);
00400             s->blocks[i]       = av_malloc(size * sizeof(**s->blocks));
00401             s->last_nnz[i]     = av_mallocz(size * sizeof(**s->last_nnz));
00402             s->block_stride[i] = bw * s->h_count[i];
00403         }
00404         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
00405     }
00406     return 0;
00407 }
00408 
00409 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
00410 {
00411     int code;
00412     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
00413     if (code < 0) {
00414         av_log(s->avctx, AV_LOG_WARNING,
00415                "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
00416                0, dc_index, &s->vlcs[0][dc_index]);
00417         return 0xffff;
00418     }
00419 
00420     if (code)
00421         return get_xbits(&s->gb, code);
00422     else
00423         return 0;
00424 }
00425 
00426 /* decode block and dequantize */
00427 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
00428                         int dc_index, int ac_index, int16_t *quant_matrix)
00429 {
00430     int code, i, j, level, val;
00431 
00432     /* DC coef */
00433     val = mjpeg_decode_dc(s, dc_index);
00434     if (val == 0xffff) {
00435         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00436         return -1;
00437     }
00438     val = val * quant_matrix[0] + s->last_dc[component];
00439     s->last_dc[component] = val;
00440     block[0] = val;
00441     /* AC coefs */
00442     i = 0;
00443     {OPEN_READER(re, &s->gb);
00444     do {
00445         UPDATE_CACHE(re, &s->gb);
00446         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
00447 
00448         i += ((unsigned)code) >> 4;
00449             code &= 0xf;
00450         if (code) {
00451             if (code > MIN_CACHE_BITS - 16)
00452                 UPDATE_CACHE(re, &s->gb);
00453 
00454             {
00455                 int cache = GET_CACHE(re, &s->gb);
00456                 int sign  = (~cache) >> 31;
00457                 level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00458             }
00459 
00460             LAST_SKIP_BITS(re, &s->gb, code);
00461 
00462             if (i > 63) {
00463                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00464                 return -1;
00465             }
00466             j        = s->scantable.permutated[i];
00467             block[j] = level * quant_matrix[j];
00468         }
00469     } while (i < 63);
00470     CLOSE_READER(re, &s->gb);}
00471 
00472     return 0;
00473 }
00474 
00475 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
00476                                  int component, int dc_index,
00477                                  int16_t *quant_matrix, int Al)
00478 {
00479     int val;
00480     s->dsp.clear_block(block);
00481     val = mjpeg_decode_dc(s, dc_index);
00482     if (val == 0xffff) {
00483         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00484         return -1;
00485     }
00486     val = (val * quant_matrix[0] << Al) + s->last_dc[component];
00487     s->last_dc[component] = val;
00488     block[0] = val;
00489     return 0;
00490 }
00491 
00492 /* decode block and dequantize - progressive JPEG version */
00493 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
00494                                     uint8_t *last_nnz, int ac_index,
00495                                     int16_t *quant_matrix,
00496                                     int ss, int se, int Al, int *EOBRUN)
00497 {
00498     int code, i, j, level, val, run;
00499 
00500     if (*EOBRUN) {
00501         (*EOBRUN)--;
00502         return 0;
00503     }
00504 
00505     {
00506         OPEN_READER(re, &s->gb);
00507         for (i = ss; ; i++) {
00508             UPDATE_CACHE(re, &s->gb);
00509             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00510 
00511             run = ((unsigned) code) >> 4;
00512             code &= 0xF;
00513             if (code) {
00514                 i += run;
00515                 if (code > MIN_CACHE_BITS - 16)
00516                     UPDATE_CACHE(re, &s->gb);
00517 
00518                 {
00519                     int cache = GET_CACHE(re, &s->gb);
00520                     int sign  = (~cache) >> 31;
00521                     level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00522                 }
00523 
00524                 LAST_SKIP_BITS(re, &s->gb, code);
00525 
00526                 if (i >= se) {
00527                     if (i == se) {
00528                         j = s->scantable.permutated[se];
00529                         block[j] = level * quant_matrix[j] << Al;
00530                         break;
00531                     }
00532                     av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00533                     return -1;
00534                 }
00535                 j = s->scantable.permutated[i];
00536                 block[j] = level * quant_matrix[j] << Al;
00537             } else {
00538                 if (run == 0xF) {// ZRL - skip 15 coefficients
00539                     i += 15;
00540                     if (i >= se) {
00541                         av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
00542                         return -1;
00543                     }
00544                 } else {
00545                     val = (1 << run);
00546                     if (run) {
00547                         UPDATE_CACHE(re, &s->gb);
00548                         val += NEG_USR32(GET_CACHE(re, &s->gb), run);
00549                         LAST_SKIP_BITS(re, &s->gb, run);
00550                     }
00551                     *EOBRUN = val - 1;
00552                     break;
00553                 }
00554             }
00555         }
00556         CLOSE_READER(re, &s->gb);
00557     }
00558 
00559     if (i > *last_nnz)
00560         *last_nnz = i;
00561 
00562     return 0;
00563 }
00564 
00565 #define REFINE_BIT(j) {                                             \
00566     UPDATE_CACHE(re, &s->gb);                                       \
00567     sign = block[j] >> 15;                                          \
00568     block[j] += SHOW_UBITS(re, &s->gb, 1) *                         \
00569                 ((quant_matrix[j] ^ sign) - sign) << Al;            \
00570     LAST_SKIP_BITS(re, &s->gb, 1);                                  \
00571 }
00572 
00573 #define ZERO_RUN                                                    \
00574 for (; ; i++) {                                                     \
00575     if (i > last) {                                                 \
00576         i += run;                                                   \
00577         if (i > se) {                                               \
00578             av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
00579             return -1;                                              \
00580         }                                                           \
00581         break;                                                      \
00582     }                                                               \
00583     j = s->scantable.permutated[i];                                 \
00584     if (block[j])                                                   \
00585         REFINE_BIT(j)                                               \
00586     else if (run-- == 0)                                            \
00587         break;                                                      \
00588 }
00589 
00590 /* decode block and dequantize - progressive JPEG refinement pass */
00591 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
00592                                    uint8_t *last_nnz,
00593                                    int ac_index, int16_t *quant_matrix,
00594                                    int ss, int se, int Al, int *EOBRUN)
00595 {
00596     int code, i = ss, j, sign, val, run;
00597     int last    = FFMIN(se, *last_nnz);
00598 
00599     OPEN_READER(re, &s->gb);
00600     if (*EOBRUN) {
00601         (*EOBRUN)--;
00602     } else {
00603         for (; ; i++) {
00604             UPDATE_CACHE(re, &s->gb);
00605             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00606 
00607             if (code & 0xF) {
00608                 run = ((unsigned) code) >> 4;
00609                 UPDATE_CACHE(re, &s->gb);
00610                 val = SHOW_UBITS(re, &s->gb, 1);
00611                 LAST_SKIP_BITS(re, &s->gb, 1);
00612                 ZERO_RUN;
00613                 j = s->scantable.permutated[i];
00614                 val--;
00615                 block[j] = ((quant_matrix[j]^val) - val) << Al;
00616                 if (i == se) {
00617                     if (i > *last_nnz)
00618                         *last_nnz = i;
00619                     CLOSE_READER(re, &s->gb);
00620                     return 0;
00621                 }
00622             } else {
00623                 run = ((unsigned) code) >> 4;
00624                 if (run == 0xF) {
00625                     ZERO_RUN;
00626                 } else {
00627                     val = run;
00628                     run = (1 << run);
00629                     if (val) {
00630                         UPDATE_CACHE(re, &s->gb);
00631                         run += SHOW_UBITS(re, &s->gb, val);
00632                         LAST_SKIP_BITS(re, &s->gb, val);
00633                     }
00634                     *EOBRUN = run - 1;
00635                     break;
00636                 }
00637             }
00638         }
00639 
00640         if (i > *last_nnz)
00641             *last_nnz = i;
00642     }
00643 
00644     for (; i <= last; i++) {
00645         j = s->scantable.permutated[i];
00646         if (block[j])
00647             REFINE_BIT(j)
00648     }
00649     CLOSE_READER(re, &s->gb);
00650 
00651     return 0;
00652 }
00653 #undef REFINE_BIT
00654 #undef ZERO_RUN
00655 
00656 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,
00657                                  int point_transform)
00658 {
00659     int i, mb_x, mb_y;
00660     uint16_t (*buffer)[4];
00661     int left[3], top[3], topleft[3];
00662     const int linesize = s->linesize[0];
00663     const int mask     = (1 << s->bits) - 1;
00664 
00665     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
00666                    (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
00667     buffer = s->ljpeg_buffer;
00668 
00669     for (i = 0; i < 3; i++)
00670         buffer[0][i] = 1 << (s->bits + point_transform - 1);
00671 
00672     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00673         const int modified_predictor = mb_y ? predictor : 1;
00674         uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
00675 
00676         if (s->interlaced && s->bottom_field)
00677             ptr += linesize >> 1;
00678 
00679         for (i = 0; i < 3; i++)
00680             top[i] = left[i] = topleft[i] = buffer[0][i];
00681 
00682         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00683             if (s->restart_interval && !s->restart_count)
00684                 s->restart_count = s->restart_interval;
00685 
00686             for (i = 0; i < 3; i++) {
00687                 int pred;
00688 
00689                 topleft[i] = top[i];
00690                 top[i]     = buffer[mb_x][i];
00691 
00692                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
00693 
00694                 left[i] = buffer[mb_x][i] =
00695                     mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
00696             }
00697 
00698             if (s->restart_interval && !--s->restart_count) {
00699                 align_get_bits(&s->gb);
00700                 skip_bits(&s->gb, 16); /* skip RSTn */
00701             }
00702         }
00703 
00704         if (s->rct) {
00705             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00706                 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
00707                 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
00708                 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
00709             }
00710         } else if (s->pegasus_rct) {
00711             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00712                 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
00713                 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
00714                 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
00715             }
00716         } else {
00717             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00718                 ptr[4 * mb_x + 0] = buffer[mb_x][2];
00719                 ptr[4 * mb_x + 1] = buffer[mb_x][1];
00720                 ptr[4 * mb_x + 2] = buffer[mb_x][0];
00721             }
00722         }
00723     }
00724     return 0;
00725 }
00726 
00727 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
00728                                  int point_transform, int nb_components)
00729 {
00730     int i, mb_x, mb_y;
00731 
00732     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00733         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00734             if (s->restart_interval && !s->restart_count)
00735                 s->restart_count = s->restart_interval;
00736 
00737             if (mb_x == 0 || mb_y == 0 || s->interlaced) {
00738                 for (i = 0; i < nb_components; i++) {
00739                     uint8_t *ptr;
00740                     int n, h, v, x, y, c, j, linesize;
00741                     n        = s->nb_blocks[i];
00742                     c        = s->comp_index[i];
00743                     h        = s->h_scount[i];
00744                     v        = s->v_scount[i];
00745                     x        = 0;
00746                     y        = 0;
00747                     linesize = s->linesize[c];
00748 
00749                     for (j = 0; j < n; j++) {
00750                         int pred;
00751                         // FIXME optimize this crap
00752                         ptr = s->picture_ptr->data[c] +
00753                               (linesize * (v * mb_y + y)) +
00754                               (h * mb_x + x);
00755                         if (y == 0 && mb_y == 0) {
00756                             if (x == 0 && mb_x == 0)
00757                                 pred = 128 << point_transform;
00758                             else
00759                                 pred = ptr[-1];
00760                         } else {
00761                             if (x == 0 && mb_x == 0)
00762                                 pred = ptr[-linesize];
00763                             else
00764                                 PREDICT(pred, ptr[-linesize - 1],
00765                                         ptr[-linesize], ptr[-1], predictor);
00766                        }
00767 
00768                         if (s->interlaced && s->bottom_field)
00769                             ptr += linesize >> 1;
00770                         *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00771 
00772                         if (++x == h) {
00773                             x = 0;
00774                             y++;
00775                         }
00776                     }
00777                 }
00778             } else {
00779                 for (i = 0; i < nb_components; i++) {
00780                     uint8_t *ptr;
00781                     int n, h, v, x, y, c, j, linesize;
00782                     n        = s->nb_blocks[i];
00783                     c        = s->comp_index[i];
00784                     h        = s->h_scount[i];
00785                     v        = s->v_scount[i];
00786                     x        = 0;
00787                     y        = 0;
00788                     linesize = s->linesize[c];
00789 
00790                     for (j = 0; j < n; j++) {
00791                         int pred;
00792 
00793                         // FIXME optimize this crap
00794                         ptr = s->picture_ptr->data[c] +
00795                               (linesize * (v * mb_y + y)) +
00796                               (h * mb_x + x);
00797                         PREDICT(pred, ptr[-linesize - 1],
00798                                 ptr[-linesize], ptr[-1], predictor);
00799                         *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00800                         if (++x == h) {
00801                             x = 0;
00802                             y++;
00803                         }
00804                     }
00805                 }
00806             }
00807             if (s->restart_interval && !--s->restart_count) {
00808                 align_get_bits(&s->gb);
00809                 skip_bits(&s->gb, 16); /* skip RSTn */
00810             }
00811         }
00812     }
00813     return 0;
00814 }
00815 
00816 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
00817                                               int linesize, int lowres)
00818 {
00819     switch (lowres) {
00820     case 0: copy_block8(dst, src, linesize, linesize, 8);
00821         break;
00822     case 1: copy_block4(dst, src, linesize, linesize, 4);
00823         break;
00824     case 2: copy_block2(dst, src, linesize, linesize, 2);
00825         break;
00826     case 3: *dst = *src;
00827         break;
00828     }
00829 }
00830 
00831 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
00832                              int Al, const uint8_t *mb_bitmask,
00833                              const AVFrame *reference)
00834 {
00835     int i, mb_x, mb_y;
00836     uint8_t *data[MAX_COMPONENTS];
00837     const uint8_t *reference_data[MAX_COMPONENTS];
00838     int linesize[MAX_COMPONENTS];
00839     GetBitContext mb_bitmask_gb;
00840 
00841     if (mb_bitmask)
00842         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00843 
00844     if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
00845         av_log(s->avctx, AV_LOG_ERROR,
00846                "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
00847         s->flipped = 0;
00848     }
00849 
00850     for (i = 0; i < nb_components; i++) {
00851         int c   = s->comp_index[i];
00852         data[c] = s->picture_ptr->data[c];
00853         reference_data[c] = reference ? reference->data[c] : NULL;
00854         linesize[c] = s->linesize[c];
00855         s->coefs_finished[c] |= 1;
00856         if (s->flipped) {
00857             // picture should be flipped upside-down for this codec
00858             int offset = (linesize[c] * (s->v_scount[i] *
00859                          (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
00860             data[c]           += offset;
00861             reference_data[c] += offset;
00862             linesize[c]       *= -1;
00863         }
00864     }
00865 
00866     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00867         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00868             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
00869 
00870             if (s->restart_interval && !s->restart_count)
00871                 s->restart_count = s->restart_interval;
00872 
00873             if (get_bits_left(&s->gb) < 0) {
00874                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
00875                        -get_bits_left(&s->gb));
00876                 return -1;
00877             }
00878             for (i = 0; i < nb_components; i++) {
00879                 uint8_t *ptr;
00880                 int n, h, v, x, y, c, j;
00881                 int block_offset;
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                 for (j = 0; j < n; j++) {
00889                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
00890                                      (h * mb_x + x) * 8) >> s->avctx->lowres);
00891 
00892                     if (s->interlaced && s->bottom_field)
00893                         block_offset += linesize[c] >> 1;
00894                     ptr = data[c] + block_offset;
00895                     if (!s->progressive) {
00896                         if (copy_mb)
00897                             mjpeg_copy_block(ptr, reference_data[c] + block_offset,
00898                                              linesize[c], s->avctx->lowres);
00899                         else {
00900                             s->dsp.clear_block(s->block);
00901                             if (decode_block(s, s->block, i,
00902                                              s->dc_index[i], s->ac_index[i],
00903                                              s->quant_matrixes[s->quant_index[c]]) < 0) {
00904                                 av_log(s->avctx, AV_LOG_ERROR,
00905                                        "error y=%d x=%d\n", mb_y, mb_x);
00906                                 return -1;
00907                             }
00908                             s->dsp.idct_put(ptr, linesize[c], s->block);
00909                         }
00910                     } else {
00911                         int block_idx  = s->block_stride[c] * (v * mb_y + y) +
00912                                          (h * mb_x + x);
00913                         DCTELEM *block = s->blocks[c][block_idx];
00914                         if (Ah)
00915                             block[0] += get_bits1(&s->gb) *
00916                                         s->quant_matrixes[s->quant_index[c]][0] << Al;
00917                         else if (decode_dc_progressive(s, block, i, s->dc_index[i],
00918                                                        s->quant_matrixes[s->quant_index[c]],
00919                                                        Al) < 0) {
00920                             av_log(s->avctx, AV_LOG_ERROR,
00921                                    "error y=%d x=%d\n", mb_y, mb_x);
00922                             return -1;
00923                         }
00924                     }
00925                     // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
00926                     //        mb_y, mb_x);
00927                     // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
00928                     //        mb_x, mb_y, x, y, c, s->bottom_field,
00929                     //        (v * mb_y + y) * 8, (h * mb_x + x) * 8);
00930                     if (++x == h) {
00931                         x = 0;
00932                         y++;
00933                     }
00934                 }
00935             }
00936 
00937             if (s->restart_interval) {
00938                 s->restart_count--;
00939                 i = 8 + ((-get_bits_count(&s->gb)) & 7);
00940                 /* skip RSTn */
00941                 if (show_bits(&s->gb, i) == (1 << i) - 1) {
00942                     int pos = get_bits_count(&s->gb);
00943                     align_get_bits(&s->gb);
00944                     while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
00945                         skip_bits(&s->gb, 8);
00946                     if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
00947                         for (i = 0; i < nb_components; i++) /* reset dc */
00948                             s->last_dc[i] = 1024;
00949                     } else
00950                         skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
00951                 }
00952             }
00953         }
00954     }
00955     return 0;
00956 }
00957 
00958 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
00959                                             int se, int Ah, int Al,
00960                                             const uint8_t *mb_bitmask,
00961                                             const AVFrame *reference)
00962 {
00963     int mb_x, mb_y;
00964     int EOBRUN = 0;
00965     int c = s->comp_index[0];
00966     uint8_t *data = s->picture_ptr->data[c];
00967     const uint8_t *reference_data = reference ? reference->data[c] : NULL;
00968     int linesize  = s->linesize[c];
00969     int last_scan = 0;
00970     int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
00971     GetBitContext mb_bitmask_gb;
00972 
00973     if (ss < 0  || ss >= 64 ||
00974         se < ss || se >= 64 ||
00975         Ah < 0  || Al < 0)
00976         return AVERROR_INVALIDDATA;
00977 
00978     if (mb_bitmask)
00979         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00980 
00981     if (!Al) {
00982         s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
00983         last_scan = !~s->coefs_finished[c];
00984     }
00985 
00986     if (s->interlaced && s->bottom_field) {
00987         int offset      = linesize >> 1;
00988         data           += offset;
00989         reference_data += offset;
00990     }
00991 
00992     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00993         int block_offset = (mb_y * linesize * 8 >> s->avctx->lowres);
00994         uint8_t *ptr     = data + block_offset;
00995         int block_idx    = mb_y * s->block_stride[c];
00996         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
00997         uint8_t *last_nnz    = &s->last_nnz[c][block_idx];
00998         for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
00999             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
01000 
01001             if (!copy_mb) {
01002                 int ret;
01003                 if (Ah)
01004                     ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
01005                                                   quant_matrix, ss, se, Al, &EOBRUN);
01006                 else
01007                     ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
01008                                                    quant_matrix, ss, se, Al, &EOBRUN);
01009                 if (ret < 0) {
01010                     av_log(s->avctx, AV_LOG_ERROR,
01011                            "error y=%d x=%d\n", mb_y, mb_x);
01012                     return -1;
01013                 }
01014             }
01015 
01016             if (last_scan) {
01017                 if (copy_mb) {
01018                     mjpeg_copy_block(ptr, reference_data + block_offset,
01019                                      linesize, s->avctx->lowres);
01020                 } else {
01021                     s->dsp.idct_put(ptr, linesize, *block);
01022                     ptr += 8 >> s->avctx->lowres;
01023                 }
01024             }
01025         }
01026     }
01027     return 0;
01028 }
01029 
01030 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
01031                         const AVFrame *reference)
01032 {
01033     int len, nb_components, i, h, v, predictor, point_transform;
01034     int index, id;
01035     const int block_size = s->lossless ? 1 : 8;
01036     int ilv, prev_shift;
01037 
01038     /* XXX: verify len field validity */
01039     len = get_bits(&s->gb, 16);
01040     nb_components = get_bits(&s->gb, 8);
01041     if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
01042         av_log(s->avctx, AV_LOG_ERROR,
01043                "decode_sos: nb_components (%d) unsupported\n", nb_components);
01044         return -1;
01045     }
01046     if (len != 6 + 2 * nb_components) {
01047         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
01048         return -1;
01049     }
01050     for (i = 0; i < nb_components; i++) {
01051         id = get_bits(&s->gb, 8) - 1;
01052         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
01053         /* find component index */
01054         for (index = 0; index < s->nb_components; index++)
01055             if (id == s->component_id[index])
01056                 break;
01057         if (index == s->nb_components) {
01058             av_log(s->avctx, AV_LOG_ERROR,
01059                    "decode_sos: index(%d) out of components\n", index);
01060             return -1;
01061         }
01062         /* Metasoft MJPEG codec has Cb and Cr swapped */
01063         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
01064             && nb_components == 3 && s->nb_components == 3 && i)
01065             index = 3 - i;
01066 
01067         s->comp_index[i] = index;
01068 
01069         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
01070         s->h_scount[i]  = s->h_count[index];
01071         s->v_scount[i]  = s->v_count[index];
01072 
01073         s->dc_index[i] = get_bits(&s->gb, 4);
01074         s->ac_index[i] = get_bits(&s->gb, 4);
01075 
01076         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
01077             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
01078             goto out_of_range;
01079         if (!s->vlcs[0][s->dc_index[i]].table ||
01080             !s->vlcs[1][s->ac_index[i]].table)
01081             goto out_of_range;
01082     }
01083 
01084     predictor = get_bits(&s->gb, 8);       /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
01085     ilv = get_bits(&s->gb, 8);             /* JPEG Se / JPEG-LS ILV */
01086     prev_shift      = get_bits(&s->gb, 4); /* Ah */
01087     point_transform = get_bits(&s->gb, 4); /* Al */
01088 
01089     for (i = 0; i < nb_components; i++)
01090         s->last_dc[i] = 1024;
01091 
01092     if (nb_components > 1) {
01093         /* interleaved stream */
01094         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
01095         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
01096     } else if (!s->ls) { /* skip this for JPEG-LS */
01097         h = s->h_max / s->h_scount[0];
01098         v = s->v_max / s->v_scount[0];
01099         s->mb_width     = (s->width  + h * block_size - 1) / (h * block_size);
01100         s->mb_height    = (s->height + v * block_size - 1) / (v * block_size);
01101         s->nb_blocks[0] = 1;
01102         s->h_scount[0]  = 1;
01103         s->v_scount[0]  = 1;
01104     }
01105 
01106     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01107         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",
01108                s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
01109                predictor, point_transform, ilv, s->bits,
01110                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
01111 
01112 
01113     /* mjpeg-b can have padding bytes between sos and image data, skip them */
01114     for (i = s->mjpb_skiptosod; i > 0; i--)
01115         skip_bits(&s->gb, 8);
01116 
01117     if (s->lossless) {
01118         if (CONFIG_JPEGLS_DECODER && s->ls) {
01119 //            for () {
01120 //            reset_ls_coding_parameters(s, 0);
01121 
01122             if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
01123                 return -1;
01124         } else {
01125             if (s->rgb) {
01126                 if (ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
01127                     return -1;
01128             } else {
01129                 if (ljpeg_decode_yuv_scan(s, predictor, point_transform,
01130                                           nb_components))
01131                     return -1;
01132             }
01133         }
01134     } else {
01135         if (s->progressive && predictor) {
01136             if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
01137                                                  point_transform,
01138                                                  mb_bitmask, reference) < 0)
01139                 return -1;
01140         } else {
01141             if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
01142                                   mb_bitmask, reference) < 0)
01143                 return -1;
01144         }
01145     }
01146     emms_c();
01147     return 0;
01148  out_of_range:
01149     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
01150     return -1;
01151 }
01152 
01153 static int mjpeg_decode_dri(MJpegDecodeContext *s)
01154 {
01155     if (get_bits(&s->gb, 16) != 4)
01156         return -1;
01157     s->restart_interval = get_bits(&s->gb, 16);
01158     s->restart_count    = 0;
01159     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
01160            s->restart_interval);
01161 
01162     return 0;
01163 }
01164 
01165 static int mjpeg_decode_app(MJpegDecodeContext *s)
01166 {
01167     int len, id, i;
01168 
01169     len = get_bits(&s->gb, 16);
01170     if (len < 5)
01171         return -1;
01172     if (8 * len > get_bits_left(&s->gb))
01173         return -1;
01174 
01175     id   = get_bits_long(&s->gb, 32);
01176     id   = av_be2ne32(id);
01177     len -= 6;
01178 
01179     if (s->avctx->debug & FF_DEBUG_STARTCODE)
01180         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
01181 
01182     /* Buggy AVID, it puts EOI only at every 10th frame. */
01183     /* Also, this fourcc is used by non-avid files too, it holds some
01184        information, but it's always present in AVID-created files. */
01185     if (id == AV_RL32("AVI1")) {
01186         /* structure:
01187             4bytes      AVI1
01188             1bytes      polarity
01189             1bytes      always zero
01190             4bytes      field_size
01191             4bytes      field_size_less_padding
01192         */
01193         s->buggy_avid = 1;
01194 //      if (s->first_picture)
01195 //          printf("mjpeg: workarounding buggy AVID\n");
01196         i = get_bits(&s->gb, 8);
01197         if (i == 2)
01198             s->bottom_field = 1;
01199         else if (i == 1)
01200             s->bottom_field = 0;
01201 #if 0
01202         skip_bits(&s->gb, 8);
01203         skip_bits(&s->gb, 32);
01204         skip_bits(&s->gb, 32);
01205         len -= 10;
01206 #endif
01207 //        if (s->interlace_polarity)
01208 //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
01209         goto out;
01210     }
01211 
01212 //    len -= 2;
01213 
01214     if (id == AV_RL32("JFIF")) {
01215         int t_w, t_h, v1, v2;
01216         skip_bits(&s->gb, 8); /* the trailing zero-byte */
01217         v1 = get_bits(&s->gb, 8);
01218         v2 = get_bits(&s->gb, 8);
01219         skip_bits(&s->gb, 8);
01220 
01221         s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
01222         s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
01223 
01224         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01225             av_log(s->avctx, AV_LOG_INFO,
01226                    "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
01227                    v1, v2,
01228                    s->avctx->sample_aspect_ratio.num,
01229                    s->avctx->sample_aspect_ratio.den);
01230 
01231         t_w = get_bits(&s->gb, 8);
01232         t_h = get_bits(&s->gb, 8);
01233         if (t_w && t_h) {
01234             /* skip thumbnail */
01235             if (len -10 - (t_w * t_h * 3) > 0)
01236                 len -= t_w * t_h * 3;
01237         }
01238         len -= 10;
01239         goto out;
01240     }
01241 
01242     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
01243         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01244             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
01245         skip_bits(&s->gb, 16); /* version */
01246         skip_bits(&s->gb, 16); /* flags0 */
01247         skip_bits(&s->gb, 16); /* flags1 */
01248         skip_bits(&s->gb,  8); /* transform */
01249         len -= 7;
01250         goto out;
01251     }
01252 
01253     if (id == AV_RL32("LJIF")) {
01254         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01255             av_log(s->avctx, AV_LOG_INFO,
01256                    "Pegasus lossless jpeg header found\n");
01257         skip_bits(&s->gb, 16); /* version ? */
01258         skip_bits(&s->gb, 16); /* unknwon always 0? */
01259         skip_bits(&s->gb, 16); /* unknwon always 0? */
01260         skip_bits(&s->gb, 16); /* unknwon always 0? */
01261         switch (get_bits(&s->gb, 8)) {
01262         case 1:
01263             s->rgb         = 1;
01264             s->pegasus_rct = 0;
01265             break;
01266         case 2:
01267             s->rgb         = 1;
01268             s->pegasus_rct = 1;
01269             break;
01270         default:
01271             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
01272         }
01273         len -= 9;
01274         goto out;
01275     }
01276 
01277     /* Apple MJPEG-A */
01278     if ((s->start_code == APP1) && (len > (0x28 - 8))) {
01279         id   = get_bits_long(&s->gb, 32);
01280         id   = av_be2ne32(id);
01281         len -= 4;
01282         /* Apple MJPEG-A */
01283         if (id == AV_RL32("mjpg")) {
01284 #if 0
01285             skip_bits(&s->gb, 32); /* field size */
01286             skip_bits(&s->gb, 32); /* pad field size */
01287             skip_bits(&s->gb, 32); /* next off */
01288             skip_bits(&s->gb, 32); /* quant off */
01289             skip_bits(&s->gb, 32); /* huff off */
01290             skip_bits(&s->gb, 32); /* image off */
01291             skip_bits(&s->gb, 32); /* scan off */
01292             skip_bits(&s->gb, 32); /* data off */
01293 #endif
01294             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01295                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
01296         }
01297     }
01298 
01299 out:
01300     /* slow but needed for extreme adobe jpegs */
01301     if (len < 0)
01302         av_log(s->avctx, AV_LOG_ERROR,
01303                "mjpeg: error, decode_app parser read over the end\n");
01304     while (--len > 0)
01305         skip_bits(&s->gb, 8);
01306 
01307     return 0;
01308 }
01309 
01310 static int mjpeg_decode_com(MJpegDecodeContext *s)
01311 {
01312     int len = get_bits(&s->gb, 16);
01313     if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
01314         char *cbuf = av_malloc(len - 1);
01315         if (cbuf) {
01316             int i;
01317             for (i = 0; i < len - 2; i++)
01318                 cbuf[i] = get_bits(&s->gb, 8);
01319             if (i > 0 && cbuf[i - 1] == '\n')
01320                 cbuf[i - 1] = 0;
01321             else
01322                 cbuf[i] = 0;
01323 
01324             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01325                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
01326 
01327             /* buggy avid, it puts EOI only at every 10th frame */
01328             if (!strcmp(cbuf, "AVID")) {
01329                 s->buggy_avid = 1;
01330                 // if (s->first_picture)
01331                 // printf("mjpeg: workarounding buggy AVID\n");
01332             } else if (!strcmp(cbuf, "CS=ITU601"))
01333                 s->cs_itu601 = 1;
01334             else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
01335                      (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
01336                 s->flipped = 1;
01337 
01338             av_free(cbuf);
01339         }
01340     }
01341 
01342     return 0;
01343 }
01344 
01345 /* return the 8 bit start code value and update the search
01346    state. Return -1 if no start code found */
01347 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
01348 {
01349     const uint8_t *buf_ptr;
01350     unsigned int v, v2;
01351     int val;
01352 #ifdef DEBUG
01353     int skipped = 0;
01354 #endif
01355 
01356     buf_ptr = *pbuf_ptr;
01357     while (buf_ptr < buf_end) {
01358         v  = *buf_ptr++;
01359         v2 = *buf_ptr;
01360         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
01361             val = *buf_ptr++;
01362             goto found;
01363         }
01364 #ifdef DEBUG
01365         skipped++;
01366 #endif
01367     }
01368     val = -1;
01369 found:
01370     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
01371     *pbuf_ptr = buf_ptr;
01372     return val;
01373 }
01374 
01375 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
01376                          const uint8_t **buf_ptr, const uint8_t *buf_end,
01377                          const uint8_t **unescaped_buf_ptr,
01378                          int *unescaped_buf_size)
01379 {
01380     int start_code;
01381     start_code = find_marker(buf_ptr, buf_end);
01382 
01383     if ((buf_end - *buf_ptr) > s->buffer_size) {
01384         av_free(s->buffer);
01385         s->buffer_size = buf_end - *buf_ptr;
01386         s->buffer      = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
01387         av_log(s->avctx, AV_LOG_DEBUG,
01388                "buffer too small, expanding to %d bytes\n", s->buffer_size);
01389     }
01390 
01391     /* unescape buffer of SOS, use special treatment for JPEG-LS */
01392     if (start_code == SOS && !s->ls) {
01393         const uint8_t *src = *buf_ptr;
01394         uint8_t *dst = s->buffer;
01395 
01396         while (src < buf_end) {
01397             uint8_t x = *(src++);
01398 
01399             *(dst++) = x;
01400             if (s->avctx->codec_id != CODEC_ID_THP) {
01401                 if (x == 0xff) {
01402                     while (src < buf_end && x == 0xff)
01403                         x = *(src++);
01404 
01405                     if (x >= 0xd0 && x <= 0xd7)
01406                         *(dst++) = x;
01407                     else if (x)
01408                         break;
01409                 }
01410             }
01411         }
01412         *unescaped_buf_ptr  = s->buffer;
01413         *unescaped_buf_size = dst - s->buffer;
01414 
01415         av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
01416                (buf_end - *buf_ptr) - (dst - s->buffer));
01417     } else if (start_code == SOS && s->ls) {
01418         const uint8_t *src = *buf_ptr;
01419         uint8_t *dst  = s->buffer;
01420         int bit_count = 0;
01421         int t = 0, b = 0;
01422         PutBitContext pb;
01423 
01424         s->cur_scan++;
01425 
01426         /* find marker */
01427         while (src + t < buf_end) {
01428             uint8_t x = src[t++];
01429             if (x == 0xff) {
01430                 while ((src + t < buf_end) && x == 0xff)
01431                     x = src[t++];
01432                 if (x & 0x80) {
01433                     t -= 2;
01434                     break;
01435                 }
01436             }
01437         }
01438         bit_count = t * 8;
01439         init_put_bits(&pb, dst, t);
01440 
01441         /* unescape bitstream */
01442         while (b < t) {
01443             uint8_t x = src[b++];
01444             put_bits(&pb, 8, x);
01445             if (x == 0xFF) {
01446                 x = src[b++];
01447                 put_bits(&pb, 7, x);
01448                 bit_count--;
01449             }
01450         }
01451         flush_put_bits(&pb);
01452 
01453         *unescaped_buf_ptr  = dst;
01454         *unescaped_buf_size = (bit_count + 7) >> 3;
01455     } else {
01456         *unescaped_buf_ptr  = *buf_ptr;
01457         *unescaped_buf_size = buf_end - *buf_ptr;
01458     }
01459 
01460     return start_code;
01461 }
01462 
01463 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
01464                           AVPacket *avpkt)
01465 {
01466     const uint8_t *buf = avpkt->data;
01467     int buf_size       = avpkt->size;
01468     MJpegDecodeContext *s = avctx->priv_data;
01469     const uint8_t *buf_end, *buf_ptr;
01470     const uint8_t *unescaped_buf_ptr;
01471     int unescaped_buf_size;
01472     int start_code;
01473     AVFrame *picture = data;
01474 
01475     s->got_picture = 0; // picture from previous image can not be reused
01476     buf_ptr = buf;
01477     buf_end = buf + buf_size;
01478     while (buf_ptr < buf_end) {
01479         /* find start next marker */
01480         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
01481                                           &unescaped_buf_ptr,
01482                                           &unescaped_buf_size);
01483         /* EOF */
01484         if (start_code < 0) {
01485             goto the_end;
01486         } else if (unescaped_buf_size > (1U<<29)) {
01487             av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
01488                    start_code, unescaped_buf_ptr, buf_size);
01489             return AVERROR_INVALIDDATA;
01490         } else {
01491             av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
01492                    start_code, buf_end - buf_ptr);
01493 
01494             init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
01495 
01496             s->start_code = start_code;
01497             if (s->avctx->debug & FF_DEBUG_STARTCODE)
01498                 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
01499 
01500             /* process markers */
01501             if (start_code >= 0xd0 && start_code <= 0xd7)
01502                 av_log(avctx, AV_LOG_DEBUG,
01503                        "restart marker: %d\n", start_code & 0x0f);
01504                 /* APP fields */
01505             else if (start_code >= APP0 && start_code <= APP15)
01506                 mjpeg_decode_app(s);
01507                 /* Comment */
01508             else if (start_code == COM)
01509                 mjpeg_decode_com(s);
01510 
01511             if (!CONFIG_JPEGLS_DECODER &&
01512                 (start_code == SOF48 || start_code == LSE)) {
01513                 av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
01514                 return AVERROR(ENOSYS);
01515             }
01516 
01517             switch (start_code) {
01518             case SOI:
01519                 s->restart_interval = 0;
01520                 s->restart_count    = 0;
01521                 /* nothing to do on SOI */
01522                 break;
01523             case DQT:
01524                 ff_mjpeg_decode_dqt(s);
01525                 break;
01526             case DHT:
01527                 if (ff_mjpeg_decode_dht(s) < 0) {
01528                     av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
01529                     return -1;
01530                 }
01531                 break;
01532             case SOF0:
01533             case SOF1:
01534                 s->lossless    = 0;
01535                 s->ls          = 0;
01536                 s->progressive = 0;
01537                 if (ff_mjpeg_decode_sof(s) < 0)
01538                     return -1;
01539                 break;
01540             case SOF2:
01541                 s->lossless    = 0;
01542                 s->ls          = 0;
01543                 s->progressive = 1;
01544                 if (ff_mjpeg_decode_sof(s) < 0)
01545                     return -1;
01546                 break;
01547             case SOF3:
01548                 s->lossless    = 1;
01549                 s->ls          = 0;
01550                 s->progressive = 0;
01551                 if (ff_mjpeg_decode_sof(s) < 0)
01552                     return -1;
01553                 break;
01554             case SOF48:
01555                 s->lossless    = 1;
01556                 s->ls          = 1;
01557                 s->progressive = 0;
01558                 if (ff_mjpeg_decode_sof(s) < 0)
01559                     return -1;
01560                 break;
01561             case LSE:
01562                 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
01563                     return -1;
01564                 break;
01565             case EOI:
01566                 s->cur_scan = 0;
01567                 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01568                     break;
01569 eoi_parser:
01570                 if (!s->got_picture) {
01571                     av_log(avctx, AV_LOG_WARNING,
01572                            "Found EOI before any SOF, ignoring\n");
01573                     break;
01574                     }
01575                 if (s->interlaced) {
01576                     s->bottom_field ^= 1;
01577                     /* if not bottom field, do not output image yet */
01578                     if (s->bottom_field == !s->interlace_polarity)
01579                         goto not_the_end;
01580                     }
01581                     *picture   = *s->picture_ptr;
01582                     *data_size = sizeof(AVFrame);
01583 
01584                     if (!s->lossless) {
01585                         picture->quality      = FFMAX3(s->qscale[0],
01586                                                        s->qscale[1],
01587                                                        s->qscale[2]);
01588                         picture->qstride      = 0;
01589                         picture->qscale_table = s->qscale_table;
01590                         memset(picture->qscale_table, picture->quality,
01591                                (s->width + 15) / 16);
01592                         if (avctx->debug & FF_DEBUG_QP)
01593                             av_log(avctx, AV_LOG_DEBUG,
01594                                    "QP: %d\n", picture->quality);
01595                         picture->quality *= FF_QP2LAMBDA;
01596                     }
01597 
01598                 goto the_end;
01599             case SOS:
01600                 if (!s->got_picture) {
01601                     av_log(avctx, AV_LOG_WARNING,
01602                            "Can not process SOS before SOF, skipping\n");
01603                     break;
01604                     }
01605                 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
01606                     (avctx->err_recognition & AV_EF_EXPLODE))
01607                     return AVERROR_INVALIDDATA;
01608                 /* buggy avid puts EOI every 10-20th frame */
01609                 /* if restart period is over process EOI */
01610                 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01611                     goto eoi_parser;
01612                 break;
01613             case DRI:
01614                 mjpeg_decode_dri(s);
01615                 break;
01616             case SOF5:
01617             case SOF6:
01618             case SOF7:
01619             case SOF9:
01620             case SOF10:
01621             case SOF11:
01622             case SOF13:
01623             case SOF14:
01624             case SOF15:
01625             case JPG:
01626                 av_log(avctx, AV_LOG_ERROR,
01627                        "mjpeg: unsupported coding type (%x)\n", start_code);
01628                 break;
01629 //              default:
01630 //              printf("mjpeg: unsupported marker (%x)\n", start_code);
01631 //              break;
01632             }
01633 
01634 not_the_end:
01635             /* eof process start code */
01636             buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
01637             av_log(avctx, AV_LOG_DEBUG,
01638                    "marker parser used %d bytes (%d bits)\n",
01639                    (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
01640         }
01641     }
01642     if (s->got_picture) {
01643         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
01644         goto eoi_parser;
01645     }
01646     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
01647     return -1;
01648 the_end:
01649     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
01650            buf_end - buf_ptr);
01651 //  return buf_end - buf_ptr;
01652     return buf_ptr - buf;
01653 }
01654 
01655 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
01656 {
01657     MJpegDecodeContext *s = avctx->priv_data;
01658     int i, j;
01659 
01660     if (s->picture_ptr && s->picture_ptr->data[0])
01661         avctx->release_buffer(avctx, s->picture_ptr);
01662 
01663     av_free(s->buffer);
01664     av_free(s->qscale_table);
01665     av_freep(&s->ljpeg_buffer);
01666     s->ljpeg_buffer_size = 0;
01667 
01668     for (i = 0; i < 3; i++) {
01669         for (j = 0; j < 4; j++)
01670             ff_free_vlc(&s->vlcs[i][j]);
01671     }
01672     for (i = 0; i < MAX_COMPONENTS; i++) {
01673         av_freep(&s->blocks[i]);
01674         av_freep(&s->last_nnz[i]);
01675     }
01676     return 0;
01677 }
01678 
01679 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
01680 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
01681 static const AVOption options[] = {
01682     { "extern_huff", "Use external huffman table.",
01683       OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
01684     { NULL },
01685 };
01686 
01687 static const AVClass mjpegdec_class = {
01688     .class_name = "MJPEG decoder",
01689     .item_name  = av_default_item_name,
01690     .option     = options,
01691     .version    = LIBAVUTIL_VERSION_INT,
01692 };
01693 
01694 AVCodec ff_mjpeg_decoder = {
01695     .name           = "mjpeg",
01696     .type           = AVMEDIA_TYPE_VIDEO,
01697     .id             = CODEC_ID_MJPEG,
01698     .priv_data_size = sizeof(MJpegDecodeContext),
01699     .init           = ff_mjpeg_decode_init,
01700     .close          = ff_mjpeg_decode_end,
01701     .decode         = ff_mjpeg_decode_frame,
01702     .capabilities   = CODEC_CAP_DR1,
01703     .max_lowres     = 3,
01704     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
01705     .priv_class     = &mjpegdec_class,
01706 };
01707 
01708 AVCodec ff_thp_decoder = {
01709     .name           = "thp",
01710     .type           = AVMEDIA_TYPE_VIDEO,
01711     .id             = CODEC_ID_THP,
01712     .priv_data_size = sizeof(MJpegDecodeContext),
01713     .init           = ff_mjpeg_decode_init,
01714     .close          = ff_mjpeg_decode_end,
01715     .decode         = ff_mjpeg_decode_frame,
01716     .capabilities   = CODEC_CAP_DR1,
01717     .max_lowres     = 3,
01718     .long_name      = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
01719 };