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 h_count[MAX_COMPONENTS] = { 0 };
00218     int v_count[MAX_COMPONENTS] = { 0 };
00219     int len, nb_components, i, width, height, bits, pix_fmt_id;
00220 
00221     /* XXX: verify len field validity */
00222     len     = get_bits(&s->gb, 16);
00223     bits    = get_bits(&s->gb, 8);
00224 
00225     if (s->pegasus_rct)
00226         bits = 9;
00227     if (bits == 9 && !s->pegasus_rct)
00228         s->rct  = 1;    // FIXME ugly
00229 
00230     if (bits != 8 && !s->lossless) {
00231         av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
00232         return -1;
00233     }
00234 
00235     height = get_bits(&s->gb, 16);
00236     width  = get_bits(&s->gb, 16);
00237 
00238     // HACK for odd_height.mov
00239     if (s->interlaced && s->width == width && s->height == height + 1)
00240         height= s->height;
00241 
00242     av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
00243     if (av_image_check_size(width, height, 0, s->avctx))
00244         return -1;
00245 
00246     nb_components = get_bits(&s->gb, 8);
00247     if (nb_components <= 0 ||
00248         nb_components > MAX_COMPONENTS)
00249         return -1;
00250     if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
00251         if (nb_components != s->nb_components) {
00252             av_log(s->avctx, AV_LOG_ERROR,
00253                    "nb_components changing in interlaced picture\n");
00254             return AVERROR_INVALIDDATA;
00255         }
00256     }
00257     if (s->ls && !(bits <= 8 || nb_components == 1)) {
00258         av_log(s->avctx, AV_LOG_ERROR,
00259                "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
00260         return -1;
00261     }
00262     s->nb_components = nb_components;
00263     s->h_max         = 1;
00264     s->v_max         = 1;
00265     for (i = 0; i < nb_components; i++) {
00266         /* component id */
00267         s->component_id[i] = get_bits(&s->gb, 8) - 1;
00268         h_count[i]      = get_bits(&s->gb, 4);
00269         v_count[i]      = get_bits(&s->gb, 4);
00270         /* compute hmax and vmax (only used in interleaved case) */
00271         if (h_count[i] > s->h_max)
00272             s->h_max = h_count[i];
00273         if (v_count[i] > s->v_max)
00274             s->v_max = v_count[i];
00275         s->quant_index[i] = get_bits(&s->gb, 8);
00276         if (s->quant_index[i] >= 4)
00277             return -1;
00278         if (!h_count[i] || !v_count[i]) {
00279             av_log(s->avctx, AV_LOG_ERROR,
00280                    "Invalid sampling factor in component %d %d:%d\n",
00281                    i, h_count[i], v_count[i]);
00282             return AVERROR_INVALIDDATA;
00283         }
00284 
00285         av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
00286                i, h_count[i], v_count[i],
00287                s->component_id[i], s->quant_index[i]);
00288     }
00289 
00290     if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
00291         av_log(s->avctx, AV_LOG_ERROR,
00292                "Subsampling in JPEG-LS is not supported.\n");
00293         return -1;
00294     }
00295 
00296     if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1)
00297         s->rgb = 1;
00298 
00299     /* if different size, realloc/alloc picture */
00300     if (width != s->width || height != s->height || bits != s->bits ||
00301         memcmp(s->h_count, h_count, sizeof(h_count))                ||
00302         memcmp(s->v_count, v_count, sizeof(v_count))) {
00303         av_freep(&s->qscale_table);
00304 
00305         s->width      = width;
00306         s->height     = height;
00307         s->bits       = bits;
00308         memcpy(s->h_count, h_count, sizeof(h_count));
00309         memcpy(s->v_count, v_count, sizeof(v_count));
00310         s->interlaced = 0;
00311 
00312         /* test interlaced mode */
00313         if (s->first_picture   &&
00314             s->org_height != 0 &&
00315             s->height < ((s->org_height * 3) / 4)) {
00316             s->interlaced                    = 1;
00317             s->bottom_field                  = s->interlace_polarity;
00318             s->picture_ptr->interlaced_frame = 1;
00319             s->picture_ptr->top_field_first  = !s->interlace_polarity;
00320             height *= 2;
00321         }
00322 
00323         avcodec_set_dimensions(s->avctx, width, height);
00324 
00325         s->qscale_table  = av_mallocz((s->width + 15) / 16);
00326         s->first_picture = 0;
00327     }
00328 
00329     if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) {
00330     /* XXX: not complete test ! */
00331     pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
00332                  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
00333                  (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
00334                  (s->h_count[3] <<  4) |  s->v_count[3];
00335     av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
00336     /* NOTE we do not allocate pictures large enough for the possible
00337      * padding of h/v_count being 4 */
00338     if (!(pix_fmt_id & 0xD0D0D0D0))
00339         pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
00340     if (!(pix_fmt_id & 0x0D0D0D0D))
00341         pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
00342 
00343     switch (pix_fmt_id) {
00344     case 0x11111100:
00345         if (s->rgb)
00346             s->avctx->pix_fmt = PIX_FMT_BGRA;
00347         else
00348             s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00349         assert(s->nb_components == 3);
00350         break;
00351     case 0x11000000:
00352         s->avctx->pix_fmt = PIX_FMT_GRAY8;
00353         break;
00354     case 0x12111100:
00355         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
00356         break;
00357     case 0x21111100:
00358         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
00359         break;
00360     case 0x22111100:
00361         s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
00362         break;
00363     default:
00364         av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
00365         return -1;
00366     }
00367     if (s->ls) {
00368         if (s->nb_components == 3)
00369             s->avctx->pix_fmt = PIX_FMT_RGB24;
00370         else if (s->nb_components != 1) {
00371             av_log(s->avctx, AV_LOG_ERROR, "Unsupported number of components %d\n", s->nb_components);
00372             return -1;
00373         } else if (s->bits <= 8)
00374             s->avctx->pix_fmt = PIX_FMT_GRAY8;
00375         else
00376             s->avctx->pix_fmt = PIX_FMT_GRAY16;
00377     }
00378 
00379     if (s->picture_ptr->data[0])
00380         s->avctx->release_buffer(s->avctx, s->picture_ptr);
00381 
00382     if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
00383         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00384         return -1;
00385     }
00386     s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
00387     s->picture_ptr->key_frame = 1;
00388     s->got_picture            = 1;
00389 
00390     for (i = 0; i < 3; i++)
00391         s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
00392 
00393 //    printf("%d %d %d %d %d %d\n",
00394 //           s->width, s->height, s->linesize[0], s->linesize[1],
00395 //           s->interlaced, s->avctx->height);
00396 
00397     if (len != (8 + (3 * nb_components)))
00398         av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
00399     }
00400 
00401     /* totally blank picture as progressive JPEG will only add details to it */
00402     if (s->progressive) {
00403         int bw = (width  + s->h_max * 8 - 1) / (s->h_max * 8);
00404         int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
00405         for (i = 0; i < s->nb_components; i++) {
00406             int size = bw * bh * s->h_count[i] * s->v_count[i];
00407             av_freep(&s->blocks[i]);
00408             av_freep(&s->last_nnz[i]);
00409             s->blocks[i]       = av_malloc(size * sizeof(**s->blocks));
00410             s->last_nnz[i]     = av_mallocz(size * sizeof(**s->last_nnz));
00411             s->block_stride[i] = bw * s->h_count[i];
00412         }
00413         memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
00414     }
00415     return 0;
00416 }
00417 
00418 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
00419 {
00420     int code;
00421     code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
00422     if (code < 0) {
00423         av_log(s->avctx, AV_LOG_WARNING,
00424                "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
00425                0, dc_index, &s->vlcs[0][dc_index]);
00426         return 0xffff;
00427     }
00428 
00429     if (code)
00430         return get_xbits(&s->gb, code);
00431     else
00432         return 0;
00433 }
00434 
00435 /* decode block and dequantize */
00436 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
00437                         int dc_index, int ac_index, int16_t *quant_matrix)
00438 {
00439     int code, i, j, level, val;
00440 
00441     /* DC coef */
00442     val = mjpeg_decode_dc(s, dc_index);
00443     if (val == 0xffff) {
00444         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00445         return -1;
00446     }
00447     val = val * quant_matrix[0] + s->last_dc[component];
00448     s->last_dc[component] = val;
00449     block[0] = val;
00450     /* AC coefs */
00451     i = 0;
00452     {OPEN_READER(re, &s->gb);
00453     do {
00454         UPDATE_CACHE(re, &s->gb);
00455         GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
00456 
00457         i += ((unsigned)code) >> 4;
00458             code &= 0xf;
00459         if (code) {
00460             if (code > MIN_CACHE_BITS - 16)
00461                 UPDATE_CACHE(re, &s->gb);
00462 
00463             {
00464                 int cache = GET_CACHE(re, &s->gb);
00465                 int sign  = (~cache) >> 31;
00466                 level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00467             }
00468 
00469             LAST_SKIP_BITS(re, &s->gb, code);
00470 
00471             if (i > 63) {
00472                 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00473                 return -1;
00474             }
00475             j        = s->scantable.permutated[i];
00476             block[j] = level * quant_matrix[j];
00477         }
00478     } while (i < 63);
00479     CLOSE_READER(re, &s->gb);}
00480 
00481     return 0;
00482 }
00483 
00484 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
00485                                  int component, int dc_index,
00486                                  int16_t *quant_matrix, int Al)
00487 {
00488     int val;
00489     s->dsp.clear_block(block);
00490     val = mjpeg_decode_dc(s, dc_index);
00491     if (val == 0xffff) {
00492         av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00493         return -1;
00494     }
00495     val = (val * quant_matrix[0] << Al) + s->last_dc[component];
00496     s->last_dc[component] = val;
00497     block[0] = val;
00498     return 0;
00499 }
00500 
00501 /* decode block and dequantize - progressive JPEG version */
00502 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
00503                                     uint8_t *last_nnz, int ac_index,
00504                                     int16_t *quant_matrix,
00505                                     int ss, int se, int Al, int *EOBRUN)
00506 {
00507     int code, i, j, level, val, run;
00508 
00509     if (*EOBRUN) {
00510         (*EOBRUN)--;
00511         return 0;
00512     }
00513 
00514     {
00515         OPEN_READER(re, &s->gb);
00516         for (i = ss; ; i++) {
00517             UPDATE_CACHE(re, &s->gb);
00518             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00519 
00520             run = ((unsigned) code) >> 4;
00521             code &= 0xF;
00522             if (code) {
00523                 i += run;
00524                 if (code > MIN_CACHE_BITS - 16)
00525                     UPDATE_CACHE(re, &s->gb);
00526 
00527                 {
00528                     int cache = GET_CACHE(re, &s->gb);
00529                     int sign  = (~cache) >> 31;
00530                     level     = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00531                 }
00532 
00533                 LAST_SKIP_BITS(re, &s->gb, code);
00534 
00535                 if (i >= se) {
00536                     if (i == se) {
00537                         j = s->scantable.permutated[se];
00538                         block[j] = level * quant_matrix[j] << Al;
00539                         break;
00540                     }
00541                     av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00542                     return -1;
00543                 }
00544                 j = s->scantable.permutated[i];
00545                 block[j] = level * quant_matrix[j] << Al;
00546             } else {
00547                 if (run == 0xF) {// ZRL - skip 15 coefficients
00548                     i += 15;
00549                     if (i >= se) {
00550                         av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
00551                         return -1;
00552                     }
00553                 } else {
00554                     val = (1 << run);
00555                     if (run) {
00556                         UPDATE_CACHE(re, &s->gb);
00557                         val += NEG_USR32(GET_CACHE(re, &s->gb), run);
00558                         LAST_SKIP_BITS(re, &s->gb, run);
00559                     }
00560                     *EOBRUN = val - 1;
00561                     break;
00562                 }
00563             }
00564         }
00565         CLOSE_READER(re, &s->gb);
00566     }
00567 
00568     if (i > *last_nnz)
00569         *last_nnz = i;
00570 
00571     return 0;
00572 }
00573 
00574 #define REFINE_BIT(j) {                                             \
00575     UPDATE_CACHE(re, &s->gb);                                       \
00576     sign = block[j] >> 15;                                          \
00577     block[j] += SHOW_UBITS(re, &s->gb, 1) *                         \
00578                 ((quant_matrix[j] ^ sign) - sign) << Al;            \
00579     LAST_SKIP_BITS(re, &s->gb, 1);                                  \
00580 }
00581 
00582 #define ZERO_RUN                                                    \
00583 for (; ; i++) {                                                     \
00584     if (i > last) {                                                 \
00585         i += run;                                                   \
00586         if (i > se) {                                               \
00587             av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
00588             return -1;                                              \
00589         }                                                           \
00590         break;                                                      \
00591     }                                                               \
00592     j = s->scantable.permutated[i];                                 \
00593     if (block[j])                                                   \
00594         REFINE_BIT(j)                                               \
00595     else if (run-- == 0)                                            \
00596         break;                                                      \
00597 }
00598 
00599 /* decode block and dequantize - progressive JPEG refinement pass */
00600 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
00601                                    uint8_t *last_nnz,
00602                                    int ac_index, int16_t *quant_matrix,
00603                                    int ss, int se, int Al, int *EOBRUN)
00604 {
00605     int code, i = ss, j, sign, val, run;
00606     int last    = FFMIN(se, *last_nnz);
00607 
00608     OPEN_READER(re, &s->gb);
00609     if (*EOBRUN) {
00610         (*EOBRUN)--;
00611     } else {
00612         for (; ; i++) {
00613             UPDATE_CACHE(re, &s->gb);
00614             GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00615 
00616             if (code & 0xF) {
00617                 run = ((unsigned) code) >> 4;
00618                 UPDATE_CACHE(re, &s->gb);
00619                 val = SHOW_UBITS(re, &s->gb, 1);
00620                 LAST_SKIP_BITS(re, &s->gb, 1);
00621                 ZERO_RUN;
00622                 j = s->scantable.permutated[i];
00623                 val--;
00624                 block[j] = ((quant_matrix[j]^val) - val) << Al;
00625                 if (i == se) {
00626                     if (i > *last_nnz)
00627                         *last_nnz = i;
00628                     CLOSE_READER(re, &s->gb);
00629                     return 0;
00630                 }
00631             } else {
00632                 run = ((unsigned) code) >> 4;
00633                 if (run == 0xF) {
00634                     ZERO_RUN;
00635                 } else {
00636                     val = run;
00637                     run = (1 << run);
00638                     if (val) {
00639                         UPDATE_CACHE(re, &s->gb);
00640                         run += SHOW_UBITS(re, &s->gb, val);
00641                         LAST_SKIP_BITS(re, &s->gb, val);
00642                     }
00643                     *EOBRUN = run - 1;
00644                     break;
00645                 }
00646             }
00647         }
00648 
00649         if (i > *last_nnz)
00650             *last_nnz = i;
00651     }
00652 
00653     for (; i <= last; i++) {
00654         j = s->scantable.permutated[i];
00655         if (block[j])
00656             REFINE_BIT(j)
00657     }
00658     CLOSE_READER(re, &s->gb);
00659 
00660     return 0;
00661 }
00662 #undef REFINE_BIT
00663 #undef ZERO_RUN
00664 
00665 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,
00666                                  int point_transform)
00667 {
00668     int i, mb_x, mb_y;
00669     uint16_t (*buffer)[4];
00670     int left[3], top[3], topleft[3];
00671     const int linesize = s->linesize[0];
00672     const int mask     = (1 << s->bits) - 1;
00673 
00674     av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
00675                    (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
00676     buffer = s->ljpeg_buffer;
00677 
00678     for (i = 0; i < 3; i++)
00679         buffer[0][i] = 1 << (s->bits + point_transform - 1);
00680 
00681     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00682         const int modified_predictor = mb_y ? predictor : 1;
00683         uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
00684 
00685         if (s->interlaced && s->bottom_field)
00686             ptr += linesize >> 1;
00687 
00688         for (i = 0; i < 3; i++)
00689             top[i] = left[i] = topleft[i] = buffer[0][i];
00690 
00691         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00692             if (s->restart_interval && !s->restart_count)
00693                 s->restart_count = s->restart_interval;
00694 
00695             for (i = 0; i < 3; i++) {
00696                 int pred;
00697 
00698                 topleft[i] = top[i];
00699                 top[i]     = buffer[mb_x][i];
00700 
00701                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
00702 
00703                 left[i] = buffer[mb_x][i] =
00704                     mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
00705             }
00706 
00707             if (s->restart_interval && !--s->restart_count) {
00708                 align_get_bits(&s->gb);
00709                 skip_bits(&s->gb, 16); /* skip RSTn */
00710             }
00711         }
00712 
00713         if (s->rct) {
00714             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00715                 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
00716                 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
00717                 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
00718             }
00719         } else if (s->pegasus_rct) {
00720             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00721                 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
00722                 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
00723                 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
00724             }
00725         } else {
00726             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00727                 ptr[4 * mb_x + 0] = buffer[mb_x][2];
00728                 ptr[4 * mb_x + 1] = buffer[mb_x][1];
00729                 ptr[4 * mb_x + 2] = buffer[mb_x][0];
00730             }
00731         }
00732     }
00733     return 0;
00734 }
00735 
00736 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
00737                                  int point_transform, int nb_components)
00738 {
00739     int i, mb_x, mb_y;
00740 
00741     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00742         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00743             if (s->restart_interval && !s->restart_count)
00744                 s->restart_count = s->restart_interval;
00745 
00746             if (mb_x == 0 || mb_y == 0 || s->interlaced) {
00747                 for (i = 0; i < nb_components; i++) {
00748                     uint8_t *ptr;
00749                     int n, h, v, x, y, c, j, linesize;
00750                     n        = s->nb_blocks[i];
00751                     c        = s->comp_index[i];
00752                     h        = s->h_scount[i];
00753                     v        = s->v_scount[i];
00754                     x        = 0;
00755                     y        = 0;
00756                     linesize = s->linesize[c];
00757 
00758                     for (j = 0; j < n; j++) {
00759                         int pred;
00760                         // FIXME optimize this crap
00761                         ptr = s->picture_ptr->data[c] +
00762                               (linesize * (v * mb_y + y)) +
00763                               (h * mb_x + x);
00764                         if (y == 0 && mb_y == 0) {
00765                             if (x == 0 && mb_x == 0)
00766                                 pred = 128 << point_transform;
00767                             else
00768                                 pred = ptr[-1];
00769                         } else {
00770                             if (x == 0 && mb_x == 0)
00771                                 pred = ptr[-linesize];
00772                             else
00773                                 PREDICT(pred, ptr[-linesize - 1],
00774                                         ptr[-linesize], ptr[-1], predictor);
00775                        }
00776 
00777                         if (s->interlaced && s->bottom_field)
00778                             ptr += linesize >> 1;
00779                         *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00780 
00781                         if (++x == h) {
00782                             x = 0;
00783                             y++;
00784                         }
00785                     }
00786                 }
00787             } else {
00788                 for (i = 0; i < nb_components; i++) {
00789                     uint8_t *ptr;
00790                     int n, h, v, x, y, c, j, linesize;
00791                     n        = s->nb_blocks[i];
00792                     c        = s->comp_index[i];
00793                     h        = s->h_scount[i];
00794                     v        = s->v_scount[i];
00795                     x        = 0;
00796                     y        = 0;
00797                     linesize = s->linesize[c];
00798 
00799                     for (j = 0; j < n; j++) {
00800                         int pred;
00801 
00802                         // FIXME optimize this crap
00803                         ptr = s->picture_ptr->data[c] +
00804                               (linesize * (v * mb_y + y)) +
00805                               (h * mb_x + x);
00806                         PREDICT(pred, ptr[-linesize - 1],
00807                                 ptr[-linesize], ptr[-1], predictor);
00808                         *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00809                         if (++x == h) {
00810                             x = 0;
00811                             y++;
00812                         }
00813                     }
00814                 }
00815             }
00816             if (s->restart_interval && !--s->restart_count) {
00817                 align_get_bits(&s->gb);
00818                 skip_bits(&s->gb, 16); /* skip RSTn */
00819             }
00820         }
00821     }
00822     return 0;
00823 }
00824 
00825 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
00826                                               int linesize, int lowres)
00827 {
00828     switch (lowres) {
00829     case 0: copy_block8(dst, src, linesize, linesize, 8);
00830         break;
00831     case 1: copy_block4(dst, src, linesize, linesize, 4);
00832         break;
00833     case 2: copy_block2(dst, src, linesize, linesize, 2);
00834         break;
00835     case 3: *dst = *src;
00836         break;
00837     }
00838 }
00839 
00840 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
00841                              int Al, const uint8_t *mb_bitmask,
00842                              const AVFrame *reference)
00843 {
00844     int i, mb_x, mb_y;
00845     uint8_t *data[MAX_COMPONENTS];
00846     const uint8_t *reference_data[MAX_COMPONENTS];
00847     int linesize[MAX_COMPONENTS];
00848     GetBitContext mb_bitmask_gb;
00849 
00850     if (mb_bitmask)
00851         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00852 
00853     if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
00854         av_log(s->avctx, AV_LOG_ERROR,
00855                "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
00856         s->flipped = 0;
00857     }
00858 
00859     for (i = 0; i < nb_components; i++) {
00860         int c   = s->comp_index[i];
00861         data[c] = s->picture_ptr->data[c];
00862         reference_data[c] = reference ? reference->data[c] : NULL;
00863         linesize[c] = s->linesize[c];
00864         s->coefs_finished[c] |= 1;
00865         if (s->flipped) {
00866             // picture should be flipped upside-down for this codec
00867             int offset = (linesize[c] * (s->v_scount[i] *
00868                          (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
00869             data[c]           += offset;
00870             reference_data[c] += offset;
00871             linesize[c]       *= -1;
00872         }
00873     }
00874 
00875     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00876         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00877             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
00878 
00879             if (s->restart_interval && !s->restart_count)
00880                 s->restart_count = s->restart_interval;
00881 
00882             if (get_bits_left(&s->gb) < 0) {
00883                 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
00884                        -get_bits_left(&s->gb));
00885                 return -1;
00886             }
00887             for (i = 0; i < nb_components; i++) {
00888                 uint8_t *ptr;
00889                 int n, h, v, x, y, c, j;
00890                 int block_offset;
00891                 n = s->nb_blocks[i];
00892                 c = s->comp_index[i];
00893                 h = s->h_scount[i];
00894                 v = s->v_scount[i];
00895                 x = 0;
00896                 y = 0;
00897                 for (j = 0; j < n; j++) {
00898                     block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
00899                                      (h * mb_x + x) * 8) >> s->avctx->lowres);
00900 
00901                     if (s->interlaced && s->bottom_field)
00902                         block_offset += linesize[c] >> 1;
00903                     ptr = data[c] + block_offset;
00904                     if (!s->progressive) {
00905                         if (copy_mb)
00906                             mjpeg_copy_block(ptr, reference_data[c] + block_offset,
00907                                              linesize[c], s->avctx->lowres);
00908                         else {
00909                             s->dsp.clear_block(s->block);
00910                             if (decode_block(s, s->block, i,
00911                                              s->dc_index[i], s->ac_index[i],
00912                                              s->quant_matrixes[s->quant_index[c]]) < 0) {
00913                                 av_log(s->avctx, AV_LOG_ERROR,
00914                                        "error y=%d x=%d\n", mb_y, mb_x);
00915                                 return -1;
00916                             }
00917                             s->dsp.idct_put(ptr, linesize[c], s->block);
00918                         }
00919                     } else {
00920                         int block_idx  = s->block_stride[c] * (v * mb_y + y) +
00921                                          (h * mb_x + x);
00922                         DCTELEM *block = s->blocks[c][block_idx];
00923                         if (Ah)
00924                             block[0] += get_bits1(&s->gb) *
00925                                         s->quant_matrixes[s->quant_index[c]][0] << Al;
00926                         else if (decode_dc_progressive(s, block, i, s->dc_index[i],
00927                                                        s->quant_matrixes[s->quant_index[c]],
00928                                                        Al) < 0) {
00929                             av_log(s->avctx, AV_LOG_ERROR,
00930                                    "error y=%d x=%d\n", mb_y, mb_x);
00931                             return -1;
00932                         }
00933                     }
00934                     // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
00935                     //        mb_y, mb_x);
00936                     // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
00937                     //        mb_x, mb_y, x, y, c, s->bottom_field,
00938                     //        (v * mb_y + y) * 8, (h * mb_x + x) * 8);
00939                     if (++x == h) {
00940                         x = 0;
00941                         y++;
00942                     }
00943                 }
00944             }
00945 
00946             if (s->restart_interval) {
00947                 s->restart_count--;
00948                 i = 8 + ((-get_bits_count(&s->gb)) & 7);
00949                 /* skip RSTn */
00950                 if (show_bits(&s->gb, i) == (1 << i) - 1) {
00951                     int pos = get_bits_count(&s->gb);
00952                     align_get_bits(&s->gb);
00953                     while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
00954                         skip_bits(&s->gb, 8);
00955                     if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
00956                         for (i = 0; i < nb_components; i++) /* reset dc */
00957                             s->last_dc[i] = 1024;
00958                     } else
00959                         skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
00960                 }
00961             }
00962         }
00963     }
00964     return 0;
00965 }
00966 
00967 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
00968                                             int se, int Ah, int Al,
00969                                             const uint8_t *mb_bitmask,
00970                                             const AVFrame *reference)
00971 {
00972     int mb_x, mb_y;
00973     int EOBRUN = 0;
00974     int c = s->comp_index[0];
00975     uint8_t *data = s->picture_ptr->data[c];
00976     const uint8_t *reference_data = reference ? reference->data[c] : NULL;
00977     int linesize  = s->linesize[c];
00978     int last_scan = 0;
00979     int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
00980     GetBitContext mb_bitmask_gb;
00981 
00982     if (ss < 0  || ss >= 64 ||
00983         se < ss || se >= 64 ||
00984         Ah < 0  || Al < 0)
00985         return AVERROR_INVALIDDATA;
00986 
00987     if (mb_bitmask)
00988         init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00989 
00990     if (!Al) {
00991         s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
00992         last_scan = !~s->coefs_finished[c];
00993     }
00994 
00995     if (s->interlaced && s->bottom_field) {
00996         int offset      = linesize >> 1;
00997         data           += offset;
00998         reference_data += offset;
00999     }
01000 
01001     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
01002         int block_offset = (mb_y * linesize * 8 >> s->avctx->lowres);
01003         uint8_t *ptr     = data + block_offset;
01004         int block_idx    = mb_y * s->block_stride[c];
01005         DCTELEM (*block)[64] = &s->blocks[c][block_idx];
01006         uint8_t *last_nnz    = &s->last_nnz[c][block_idx];
01007         for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
01008             const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
01009 
01010             if (!copy_mb) {
01011                 int ret;
01012                 if (Ah)
01013                     ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
01014                                                   quant_matrix, ss, se, Al, &EOBRUN);
01015                 else
01016                     ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
01017                                                    quant_matrix, ss, se, Al, &EOBRUN);
01018                 if (ret < 0) {
01019                     av_log(s->avctx, AV_LOG_ERROR,
01020                            "error y=%d x=%d\n", mb_y, mb_x);
01021                     return -1;
01022                 }
01023             }
01024 
01025             if (last_scan) {
01026                 if (copy_mb) {
01027                     mjpeg_copy_block(ptr, reference_data + block_offset,
01028                                      linesize, s->avctx->lowres);
01029                 } else {
01030                     s->dsp.idct_put(ptr, linesize, *block);
01031                     ptr += 8 >> s->avctx->lowres;
01032                 }
01033             }
01034         }
01035     }
01036     return 0;
01037 }
01038 
01039 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
01040                         const AVFrame *reference)
01041 {
01042     int len, nb_components, i, h, v, predictor, point_transform;
01043     int index, id;
01044     const int block_size = s->lossless ? 1 : 8;
01045     int ilv, prev_shift;
01046 
01047     /* XXX: verify len field validity */
01048     len = get_bits(&s->gb, 16);
01049     nb_components = get_bits(&s->gb, 8);
01050     if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
01051         av_log(s->avctx, AV_LOG_ERROR,
01052                "decode_sos: nb_components (%d) unsupported\n", nb_components);
01053         return -1;
01054     }
01055     if (len != 6 + 2 * nb_components) {
01056         av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
01057         return -1;
01058     }
01059     for (i = 0; i < nb_components; i++) {
01060         id = get_bits(&s->gb, 8) - 1;
01061         av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
01062         /* find component index */
01063         for (index = 0; index < s->nb_components; index++)
01064             if (id == s->component_id[index])
01065                 break;
01066         if (index == s->nb_components) {
01067             av_log(s->avctx, AV_LOG_ERROR,
01068                    "decode_sos: index(%d) out of components\n", index);
01069             return -1;
01070         }
01071         /* Metasoft MJPEG codec has Cb and Cr swapped */
01072         if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
01073             && nb_components == 3 && s->nb_components == 3 && i)
01074             index = 3 - i;
01075 
01076         s->comp_index[i] = index;
01077 
01078         s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
01079         s->h_scount[i]  = s->h_count[index];
01080         s->v_scount[i]  = s->v_count[index];
01081 
01082         s->dc_index[i] = get_bits(&s->gb, 4);
01083         s->ac_index[i] = get_bits(&s->gb, 4);
01084 
01085         if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
01086             s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
01087             goto out_of_range;
01088         if (!s->vlcs[0][s->dc_index[i]].table ||
01089             !s->vlcs[1][s->ac_index[i]].table)
01090             goto out_of_range;
01091     }
01092 
01093     predictor = get_bits(&s->gb, 8);       /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
01094     ilv = get_bits(&s->gb, 8);             /* JPEG Se / JPEG-LS ILV */
01095     prev_shift      = get_bits(&s->gb, 4); /* Ah */
01096     point_transform = get_bits(&s->gb, 4); /* Al */
01097 
01098     for (i = 0; i < nb_components; i++)
01099         s->last_dc[i] = 1024;
01100 
01101     if (nb_components > 1) {
01102         /* interleaved stream */
01103         s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
01104         s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
01105     } else if (!s->ls) { /* skip this for JPEG-LS */
01106         h = s->h_max / s->h_scount[0];
01107         v = s->v_max / s->v_scount[0];
01108         s->mb_width     = (s->width  + h * block_size - 1) / (h * block_size);
01109         s->mb_height    = (s->height + v * block_size - 1) / (v * block_size);
01110         s->nb_blocks[0] = 1;
01111         s->h_scount[0]  = 1;
01112         s->v_scount[0]  = 1;
01113     }
01114 
01115     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01116         av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",
01117                s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
01118                predictor, point_transform, ilv, s->bits,
01119                s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
01120 
01121 
01122     /* mjpeg-b can have padding bytes between sos and image data, skip them */
01123     for (i = s->mjpb_skiptosod; i > 0; i--)
01124         skip_bits(&s->gb, 8);
01125 
01126     if (s->lossless) {
01127         if (CONFIG_JPEGLS_DECODER && s->ls) {
01128 //            for () {
01129 //            reset_ls_coding_parameters(s, 0);
01130 
01131             if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
01132                 return -1;
01133         } else {
01134             if (s->rgb) {
01135                 if (ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
01136                     return -1;
01137             } else {
01138                 if (ljpeg_decode_yuv_scan(s, predictor, point_transform,
01139                                           nb_components))
01140                     return -1;
01141             }
01142         }
01143     } else {
01144         if (s->progressive && predictor) {
01145             if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
01146                                                  point_transform,
01147                                                  mb_bitmask, reference) < 0)
01148                 return -1;
01149         } else {
01150             if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
01151                                   mb_bitmask, reference) < 0)
01152                 return -1;
01153         }
01154     }
01155     emms_c();
01156     return 0;
01157  out_of_range:
01158     av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
01159     return -1;
01160 }
01161 
01162 static int mjpeg_decode_dri(MJpegDecodeContext *s)
01163 {
01164     if (get_bits(&s->gb, 16) != 4)
01165         return -1;
01166     s->restart_interval = get_bits(&s->gb, 16);
01167     s->restart_count    = 0;
01168     av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
01169            s->restart_interval);
01170 
01171     return 0;
01172 }
01173 
01174 static int mjpeg_decode_app(MJpegDecodeContext *s)
01175 {
01176     int len, id, i;
01177 
01178     len = get_bits(&s->gb, 16);
01179     if (len < 5)
01180         return -1;
01181     if (8 * len > get_bits_left(&s->gb))
01182         return -1;
01183 
01184     id   = get_bits_long(&s->gb, 32);
01185     id   = av_be2ne32(id);
01186     len -= 6;
01187 
01188     if (s->avctx->debug & FF_DEBUG_STARTCODE)
01189         av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
01190 
01191     /* Buggy AVID, it puts EOI only at every 10th frame. */
01192     /* Also, this fourcc is used by non-avid files too, it holds some
01193        information, but it's always present in AVID-created files. */
01194     if (id == AV_RL32("AVI1")) {
01195         /* structure:
01196             4bytes      AVI1
01197             1bytes      polarity
01198             1bytes      always zero
01199             4bytes      field_size
01200             4bytes      field_size_less_padding
01201         */
01202         s->buggy_avid = 1;
01203 //      if (s->first_picture)
01204 //          printf("mjpeg: workarounding buggy AVID\n");
01205         i = get_bits(&s->gb, 8);
01206         if (i == 2)
01207             s->bottom_field = 1;
01208         else if (i == 1)
01209             s->bottom_field = 0;
01210 #if 0
01211         skip_bits(&s->gb, 8);
01212         skip_bits(&s->gb, 32);
01213         skip_bits(&s->gb, 32);
01214         len -= 10;
01215 #endif
01216 //        if (s->interlace_polarity)
01217 //            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
01218         goto out;
01219     }
01220 
01221 //    len -= 2;
01222 
01223     if (id == AV_RL32("JFIF")) {
01224         int t_w, t_h, v1, v2;
01225         skip_bits(&s->gb, 8); /* the trailing zero-byte */
01226         v1 = get_bits(&s->gb, 8);
01227         v2 = get_bits(&s->gb, 8);
01228         skip_bits(&s->gb, 8);
01229 
01230         s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
01231         s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
01232 
01233         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01234             av_log(s->avctx, AV_LOG_INFO,
01235                    "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
01236                    v1, v2,
01237                    s->avctx->sample_aspect_ratio.num,
01238                    s->avctx->sample_aspect_ratio.den);
01239 
01240         t_w = get_bits(&s->gb, 8);
01241         t_h = get_bits(&s->gb, 8);
01242         if (t_w && t_h) {
01243             /* skip thumbnail */
01244             if (len -10 - (t_w * t_h * 3) > 0)
01245                 len -= t_w * t_h * 3;
01246         }
01247         len -= 10;
01248         goto out;
01249     }
01250 
01251     if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
01252         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01253             av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
01254         skip_bits(&s->gb, 16); /* version */
01255         skip_bits(&s->gb, 16); /* flags0 */
01256         skip_bits(&s->gb, 16); /* flags1 */
01257         skip_bits(&s->gb,  8); /* transform */
01258         len -= 7;
01259         goto out;
01260     }
01261 
01262     if (id == AV_RL32("LJIF")) {
01263         if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01264             av_log(s->avctx, AV_LOG_INFO,
01265                    "Pegasus lossless jpeg header found\n");
01266         skip_bits(&s->gb, 16); /* version ? */
01267         skip_bits(&s->gb, 16); /* unknwon always 0? */
01268         skip_bits(&s->gb, 16); /* unknwon always 0? */
01269         skip_bits(&s->gb, 16); /* unknwon always 0? */
01270         switch (get_bits(&s->gb, 8)) {
01271         case 1:
01272             s->rgb         = 1;
01273             s->pegasus_rct = 0;
01274             break;
01275         case 2:
01276             s->rgb         = 1;
01277             s->pegasus_rct = 1;
01278             break;
01279         default:
01280             av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
01281         }
01282         len -= 9;
01283         goto out;
01284     }
01285 
01286     /* Apple MJPEG-A */
01287     if ((s->start_code == APP1) && (len > (0x28 - 8))) {
01288         id   = get_bits_long(&s->gb, 32);
01289         id   = av_be2ne32(id);
01290         len -= 4;
01291         /* Apple MJPEG-A */
01292         if (id == AV_RL32("mjpg")) {
01293 #if 0
01294             skip_bits(&s->gb, 32); /* field size */
01295             skip_bits(&s->gb, 32); /* pad field size */
01296             skip_bits(&s->gb, 32); /* next off */
01297             skip_bits(&s->gb, 32); /* quant off */
01298             skip_bits(&s->gb, 32); /* huff off */
01299             skip_bits(&s->gb, 32); /* image off */
01300             skip_bits(&s->gb, 32); /* scan off */
01301             skip_bits(&s->gb, 32); /* data off */
01302 #endif
01303             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01304                 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
01305         }
01306     }
01307 
01308 out:
01309     /* slow but needed for extreme adobe jpegs */
01310     if (len < 0)
01311         av_log(s->avctx, AV_LOG_ERROR,
01312                "mjpeg: error, decode_app parser read over the end\n");
01313     while (--len > 0)
01314         skip_bits(&s->gb, 8);
01315 
01316     return 0;
01317 }
01318 
01319 static int mjpeg_decode_com(MJpegDecodeContext *s)
01320 {
01321     int len = get_bits(&s->gb, 16);
01322     if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
01323         char *cbuf = av_malloc(len - 1);
01324         if (cbuf) {
01325             int i;
01326             for (i = 0; i < len - 2; i++)
01327                 cbuf[i] = get_bits(&s->gb, 8);
01328             if (i > 0 && cbuf[i - 1] == '\n')
01329                 cbuf[i - 1] = 0;
01330             else
01331                 cbuf[i] = 0;
01332 
01333             if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01334                 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
01335 
01336             /* buggy avid, it puts EOI only at every 10th frame */
01337             if (!strcmp(cbuf, "AVID")) {
01338                 s->buggy_avid = 1;
01339                 // if (s->first_picture)
01340                 // printf("mjpeg: workarounding buggy AVID\n");
01341             } else if (!strcmp(cbuf, "CS=ITU601"))
01342                 s->cs_itu601 = 1;
01343             else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
01344                      (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
01345                 s->flipped = 1;
01346 
01347             av_free(cbuf);
01348         }
01349     }
01350 
01351     return 0;
01352 }
01353 
01354 /* return the 8 bit start code value and update the search
01355    state. Return -1 if no start code found */
01356 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
01357 {
01358     const uint8_t *buf_ptr;
01359     unsigned int v, v2;
01360     int val;
01361 #ifdef DEBUG
01362     int skipped = 0;
01363 #endif
01364 
01365     buf_ptr = *pbuf_ptr;
01366     while (buf_ptr < buf_end) {
01367         v  = *buf_ptr++;
01368         v2 = *buf_ptr;
01369         if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
01370             val = *buf_ptr++;
01371             goto found;
01372         }
01373 #ifdef DEBUG
01374         skipped++;
01375 #endif
01376     }
01377     val = -1;
01378 found:
01379     av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
01380     *pbuf_ptr = buf_ptr;
01381     return val;
01382 }
01383 
01384 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
01385                          const uint8_t **buf_ptr, const uint8_t *buf_end,
01386                          const uint8_t **unescaped_buf_ptr,
01387                          int *unescaped_buf_size)
01388 {
01389     int start_code;
01390     start_code = find_marker(buf_ptr, buf_end);
01391 
01392     if ((buf_end - *buf_ptr) > s->buffer_size) {
01393         av_free(s->buffer);
01394         s->buffer_size = buf_end - *buf_ptr;
01395         s->buffer      = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
01396         av_log(s->avctx, AV_LOG_DEBUG,
01397                "buffer too small, expanding to %d bytes\n", s->buffer_size);
01398     }
01399 
01400     /* unescape buffer of SOS, use special treatment for JPEG-LS */
01401     if (start_code == SOS && !s->ls) {
01402         const uint8_t *src = *buf_ptr;
01403         uint8_t *dst = s->buffer;
01404 
01405         while (src < buf_end) {
01406             uint8_t x = *(src++);
01407 
01408             *(dst++) = x;
01409             if (s->avctx->codec_id != CODEC_ID_THP) {
01410                 if (x == 0xff) {
01411                     while (src < buf_end && x == 0xff)
01412                         x = *(src++);
01413 
01414                     if (x >= 0xd0 && x <= 0xd7)
01415                         *(dst++) = x;
01416                     else if (x)
01417                         break;
01418                 }
01419             }
01420         }
01421         *unescaped_buf_ptr  = s->buffer;
01422         *unescaped_buf_size = dst - s->buffer;
01423 
01424         av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
01425                (buf_end - *buf_ptr) - (dst - s->buffer));
01426     } else if (start_code == SOS && s->ls) {
01427         const uint8_t *src = *buf_ptr;
01428         uint8_t *dst  = s->buffer;
01429         int bit_count = 0;
01430         int t = 0, b = 0;
01431         PutBitContext pb;
01432 
01433         s->cur_scan++;
01434 
01435         /* find marker */
01436         while (src + t < buf_end) {
01437             uint8_t x = src[t++];
01438             if (x == 0xff) {
01439                 while ((src + t < buf_end) && x == 0xff)
01440                     x = src[t++];
01441                 if (x & 0x80) {
01442                     t -= 2;
01443                     break;
01444                 }
01445             }
01446         }
01447         bit_count = t * 8;
01448         init_put_bits(&pb, dst, t);
01449 
01450         /* unescape bitstream */
01451         while (b < t) {
01452             uint8_t x = src[b++];
01453             put_bits(&pb, 8, x);
01454             if (x == 0xFF) {
01455                 x = src[b++];
01456                 put_bits(&pb, 7, x);
01457                 bit_count--;
01458             }
01459         }
01460         flush_put_bits(&pb);
01461 
01462         *unescaped_buf_ptr  = dst;
01463         *unescaped_buf_size = (bit_count + 7) >> 3;
01464     } else {
01465         *unescaped_buf_ptr  = *buf_ptr;
01466         *unescaped_buf_size = buf_end - *buf_ptr;
01467     }
01468 
01469     return start_code;
01470 }
01471 
01472 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
01473                           AVPacket *avpkt)
01474 {
01475     const uint8_t *buf = avpkt->data;
01476     int buf_size       = avpkt->size;
01477     MJpegDecodeContext *s = avctx->priv_data;
01478     const uint8_t *buf_end, *buf_ptr;
01479     const uint8_t *unescaped_buf_ptr;
01480     int unescaped_buf_size;
01481     int start_code;
01482     AVFrame *picture = data;
01483 
01484     s->got_picture = 0; // picture from previous image can not be reused
01485     buf_ptr = buf;
01486     buf_end = buf + buf_size;
01487     while (buf_ptr < buf_end) {
01488         /* find start next marker */
01489         start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
01490                                           &unescaped_buf_ptr,
01491                                           &unescaped_buf_size);
01492         /* EOF */
01493         if (start_code < 0) {
01494             goto the_end;
01495         } else if (unescaped_buf_size > (1U<<29)) {
01496             av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
01497                    start_code, unescaped_buf_ptr, buf_size);
01498             return AVERROR_INVALIDDATA;
01499         } else {
01500             av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
01501                    start_code, buf_end - buf_ptr);
01502 
01503             init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
01504 
01505             s->start_code = start_code;
01506             if (s->avctx->debug & FF_DEBUG_STARTCODE)
01507                 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
01508 
01509             /* process markers */
01510             if (start_code >= 0xd0 && start_code <= 0xd7)
01511                 av_log(avctx, AV_LOG_DEBUG,
01512                        "restart marker: %d\n", start_code & 0x0f);
01513                 /* APP fields */
01514             else if (start_code >= APP0 && start_code <= APP15)
01515                 mjpeg_decode_app(s);
01516                 /* Comment */
01517             else if (start_code == COM)
01518                 mjpeg_decode_com(s);
01519 
01520             if (!CONFIG_JPEGLS_DECODER &&
01521                 (start_code == SOF48 || start_code == LSE)) {
01522                 av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
01523                 return AVERROR(ENOSYS);
01524             }
01525 
01526             switch (start_code) {
01527             case SOI:
01528                 s->restart_interval = 0;
01529                 s->restart_count    = 0;
01530                 /* nothing to do on SOI */
01531                 break;
01532             case DQT:
01533                 ff_mjpeg_decode_dqt(s);
01534                 break;
01535             case DHT:
01536                 if (ff_mjpeg_decode_dht(s) < 0) {
01537                     av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
01538                     return -1;
01539                 }
01540                 break;
01541             case SOF0:
01542             case SOF1:
01543                 s->lossless    = 0;
01544                 s->ls          = 0;
01545                 s->progressive = 0;
01546                 if (ff_mjpeg_decode_sof(s) < 0)
01547                     return -1;
01548                 break;
01549             case SOF2:
01550                 s->lossless    = 0;
01551                 s->ls          = 0;
01552                 s->progressive = 1;
01553                 if (ff_mjpeg_decode_sof(s) < 0)
01554                     return -1;
01555                 break;
01556             case SOF3:
01557                 s->lossless    = 1;
01558                 s->ls          = 0;
01559                 s->progressive = 0;
01560                 if (ff_mjpeg_decode_sof(s) < 0)
01561                     return -1;
01562                 break;
01563             case SOF48:
01564                 s->lossless    = 1;
01565                 s->ls          = 1;
01566                 s->progressive = 0;
01567                 if (ff_mjpeg_decode_sof(s) < 0)
01568                     return -1;
01569                 break;
01570             case LSE:
01571                 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
01572                     return -1;
01573                 break;
01574             case EOI:
01575                 s->cur_scan = 0;
01576                 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01577                     break;
01578 eoi_parser:
01579                 if (!s->got_picture) {
01580                     av_log(avctx, AV_LOG_WARNING,
01581                            "Found EOI before any SOF, ignoring\n");
01582                     break;
01583                     }
01584                 if (s->interlaced) {
01585                     s->bottom_field ^= 1;
01586                     /* if not bottom field, do not output image yet */
01587                     if (s->bottom_field == !s->interlace_polarity)
01588                         goto not_the_end;
01589                     }
01590                     *picture   = *s->picture_ptr;
01591                     *data_size = sizeof(AVFrame);
01592 
01593                     if (!s->lossless) {
01594                         picture->quality      = FFMAX3(s->qscale[0],
01595                                                        s->qscale[1],
01596                                                        s->qscale[2]);
01597                         picture->qstride      = 0;
01598                         picture->qscale_table = s->qscale_table;
01599                         memset(picture->qscale_table, picture->quality,
01600                                (s->width + 15) / 16);
01601                         if (avctx->debug & FF_DEBUG_QP)
01602                             av_log(avctx, AV_LOG_DEBUG,
01603                                    "QP: %d\n", picture->quality);
01604                         picture->quality *= FF_QP2LAMBDA;
01605                     }
01606 
01607                 goto the_end;
01608             case SOS:
01609                 if (!s->got_picture) {
01610                     av_log(avctx, AV_LOG_WARNING,
01611                            "Can not process SOS before SOF, skipping\n");
01612                     break;
01613                     }
01614                 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
01615                     (avctx->err_recognition & AV_EF_EXPLODE))
01616                     return AVERROR_INVALIDDATA;
01617                 /* buggy avid puts EOI every 10-20th frame */
01618                 /* if restart period is over process EOI */
01619                 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01620                     goto eoi_parser;
01621                 break;
01622             case DRI:
01623                 mjpeg_decode_dri(s);
01624                 break;
01625             case SOF5:
01626             case SOF6:
01627             case SOF7:
01628             case SOF9:
01629             case SOF10:
01630             case SOF11:
01631             case SOF13:
01632             case SOF14:
01633             case SOF15:
01634             case JPG:
01635                 av_log(avctx, AV_LOG_ERROR,
01636                        "mjpeg: unsupported coding type (%x)\n", start_code);
01637                 break;
01638 //              default:
01639 //              printf("mjpeg: unsupported marker (%x)\n", start_code);
01640 //              break;
01641             }
01642 
01643 not_the_end:
01644             /* eof process start code */
01645             buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
01646             av_log(avctx, AV_LOG_DEBUG,
01647                    "marker parser used %d bytes (%d bits)\n",
01648                    (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
01649         }
01650     }
01651     if (s->got_picture) {
01652         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
01653         goto eoi_parser;
01654     }
01655     av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
01656     return -1;
01657 the_end:
01658     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
01659            buf_end - buf_ptr);
01660 //  return buf_end - buf_ptr;
01661     return buf_ptr - buf;
01662 }
01663 
01664 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
01665 {
01666     MJpegDecodeContext *s = avctx->priv_data;
01667     int i, j;
01668 
01669     if (s->picture_ptr && s->picture_ptr->data[0])
01670         avctx->release_buffer(avctx, s->picture_ptr);
01671 
01672     av_free(s->buffer);
01673     av_free(s->qscale_table);
01674     av_freep(&s->ljpeg_buffer);
01675     s->ljpeg_buffer_size = 0;
01676 
01677     for (i = 0; i < 3; i++) {
01678         for (j = 0; j < 4; j++)
01679             ff_free_vlc(&s->vlcs[i][j]);
01680     }
01681     for (i = 0; i < MAX_COMPONENTS; i++) {
01682         av_freep(&s->blocks[i]);
01683         av_freep(&s->last_nnz[i]);
01684     }
01685     return 0;
01686 }
01687 
01688 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
01689 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
01690 static const AVOption options[] = {
01691     { "extern_huff", "Use external huffman table.",
01692       OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
01693     { NULL },
01694 };
01695 
01696 static const AVClass mjpegdec_class = {
01697     .class_name = "MJPEG decoder",
01698     .item_name  = av_default_item_name,
01699     .option     = options,
01700     .version    = LIBAVUTIL_VERSION_INT,
01701 };
01702 
01703 AVCodec ff_mjpeg_decoder = {
01704     .name           = "mjpeg",
01705     .type           = AVMEDIA_TYPE_VIDEO,
01706     .id             = CODEC_ID_MJPEG,
01707     .priv_data_size = sizeof(MJpegDecodeContext),
01708     .init           = ff_mjpeg_decode_init,
01709     .close          = ff_mjpeg_decode_end,
01710     .decode         = ff_mjpeg_decode_frame,
01711     .capabilities   = CODEC_CAP_DR1,
01712     .max_lowres     = 3,
01713     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
01714     .priv_class     = &mjpegdec_class,
01715 };
01716 
01717 AVCodec ff_thp_decoder = {
01718     .name           = "thp",
01719     .type           = AVMEDIA_TYPE_VIDEO,
01720     .id             = CODEC_ID_THP,
01721     .priv_data_size = sizeof(MJpegDecodeContext),
01722     .init           = ff_mjpeg_decode_init,
01723     .close          = ff_mjpeg_decode_end,
01724     .decode         = ff_mjpeg_decode_frame,
01725     .capabilities   = CODEC_CAP_DR1,
01726     .max_lowres     = 3,
01727     .long_name      = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
01728 };