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