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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 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) {
00118 s->interlace_polarity = 1;
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
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
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
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
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
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
00198 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 free_vlc(&s->vlcs[2][index]);
00207 if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
00208 code_max + 1, 0, 0) < 0)
00209 return -1;
00210 }
00211 }
00212 return 0;
00213 }
00214
00215 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
00216 {
00217 int len, nb_components, i, width, height, pix_fmt_id;
00218
00219
00220 len = get_bits(&s->gb, 16);
00221 s->bits = get_bits(&s->gb, 8);
00222
00223 if (s->pegasus_rct)
00224 s->bits = 9;
00225 if (s->bits == 9 && !s->pegasus_rct)
00226 s->rct = 1;
00227
00228 if (s->bits != 8 && !s->lossless) {
00229 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
00230 return -1;
00231 }
00232
00233 height = get_bits(&s->gb, 16);
00234 width = get_bits(&s->gb, 16);
00235
00236
00237 if (s->interlaced && s->width == width && s->height == height + 1)
00238 height= s->height;
00239
00240 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
00241 if (av_image_check_size(width, height, 0, s->avctx))
00242 return -1;
00243
00244 nb_components = get_bits(&s->gb, 8);
00245 if (nb_components <= 0 ||
00246 nb_components > MAX_COMPONENTS)
00247 return -1;
00248 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
00249 av_log(s->avctx, AV_LOG_ERROR,
00250 "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
00251 return -1;
00252 }
00253 s->nb_components = nb_components;
00254 s->h_max = 1;
00255 s->v_max = 1;
00256 for (i = 0; i < nb_components; i++) {
00257
00258 s->component_id[i] = get_bits(&s->gb, 8) - 1;
00259 s->h_count[i] = get_bits(&s->gb, 4);
00260 s->v_count[i] = get_bits(&s->gb, 4);
00261
00262 if (s->h_count[i] > s->h_max)
00263 s->h_max = s->h_count[i];
00264 if (s->v_count[i] > s->v_max)
00265 s->v_max = s->v_count[i];
00266 s->quant_index[i] = get_bits(&s->gb, 8);
00267 if (s->quant_index[i] >= 4)
00268 return -1;
00269 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
00270 i, s->h_count[i], s->v_count[i],
00271 s->component_id[i], s->quant_index[i]);
00272 }
00273
00274 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
00275 av_log(s->avctx, AV_LOG_ERROR,
00276 "Subsampling in JPEG-LS is not supported.\n");
00277 return -1;
00278 }
00279
00280 if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1)
00281 s->rgb = 1;
00282
00283
00284
00285 if (width != s->width || height != s->height) {
00286 av_freep(&s->qscale_table);
00287
00288 s->width = width;
00289 s->height = height;
00290 s->interlaced = 0;
00291
00292
00293 if (s->first_picture &&
00294 s->org_height != 0 &&
00295 s->height < ((s->org_height * 3) / 4)) {
00296 s->interlaced = 1;
00297 s->bottom_field = s->interlace_polarity;
00298 s->picture_ptr->interlaced_frame = 1;
00299 s->picture_ptr->top_field_first = !s->interlace_polarity;
00300 height *= 2;
00301 }
00302
00303 avcodec_set_dimensions(s->avctx, width, height);
00304
00305 s->qscale_table = av_mallocz((s->width + 15) / 16);
00306 s->first_picture = 0;
00307 }
00308
00309 if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) {
00310
00311 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
00312 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
00313 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
00314 (s->h_count[3] << 4) | s->v_count[3];
00315 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
00316
00317
00318 if (!(pix_fmt_id & 0xD0D0D0D0))
00319 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
00320 if (!(pix_fmt_id & 0x0D0D0D0D))
00321 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
00322
00323 switch (pix_fmt_id) {
00324 case 0x11111100:
00325 if (s->rgb)
00326 s->avctx->pix_fmt = PIX_FMT_BGRA;
00327 else
00328 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
00329 assert(s->nb_components == 3);
00330 break;
00331 case 0x11000000:
00332 s->avctx->pix_fmt = PIX_FMT_GRAY8;
00333 break;
00334 case 0x12111100:
00335 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
00336 break;
00337 case 0x21111100:
00338 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
00339 break;
00340 case 0x22111100:
00341 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
00342 break;
00343 default:
00344 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
00345 return -1;
00346 }
00347 if (s->ls) {
00348 if (s->nb_components > 1)
00349 s->avctx->pix_fmt = PIX_FMT_RGB24;
00350 else if (s->bits <= 8)
00351 s->avctx->pix_fmt = PIX_FMT_GRAY8;
00352 else
00353 s->avctx->pix_fmt = PIX_FMT_GRAY16;
00354 }
00355
00356 if (s->picture_ptr->data[0])
00357 s->avctx->release_buffer(s->avctx, s->picture_ptr);
00358
00359 if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
00360 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00361 return -1;
00362 }
00363 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
00364 s->picture_ptr->key_frame = 1;
00365 s->got_picture = 1;
00366
00367 for (i = 0; i < 3; i++)
00368 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
00369
00370
00371
00372
00373
00374 if (len != (8 + (3 * nb_components)))
00375 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
00376 }
00377
00378
00379 if (s->progressive) {
00380 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
00381 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
00382 for (i = 0; i < s->nb_components; i++) {
00383 int size = bw * bh * s->h_count[i] * s->v_count[i];
00384 av_freep(&s->blocks[i]);
00385 av_freep(&s->last_nnz[i]);
00386 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
00387 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
00388 s->block_stride[i] = bw * s->h_count[i];
00389 }
00390 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
00391 }
00392 return 0;
00393 }
00394
00395 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
00396 {
00397 int code;
00398 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
00399 if (code < 0) {
00400 av_log(s->avctx, AV_LOG_WARNING,
00401 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
00402 0, dc_index, &s->vlcs[0][dc_index]);
00403 return 0xffff;
00404 }
00405
00406 if (code)
00407 return get_xbits(&s->gb, code);
00408 else
00409 return 0;
00410 }
00411
00412
00413 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
00414 int dc_index, int ac_index, int16_t *quant_matrix)
00415 {
00416 int code, i, j, level, val;
00417
00418
00419 val = mjpeg_decode_dc(s, dc_index);
00420 if (val == 0xffff) {
00421 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00422 return -1;
00423 }
00424 val = val * quant_matrix[0] + s->last_dc[component];
00425 s->last_dc[component] = val;
00426 block[0] = val;
00427
00428 i = 0;
00429 {OPEN_READER(re, &s->gb);
00430 do {
00431 UPDATE_CACHE(re, &s->gb);
00432 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
00433
00434 i += ((unsigned)code) >> 4;
00435 code &= 0xf;
00436 if (code) {
00437 if (code > MIN_CACHE_BITS - 16)
00438 UPDATE_CACHE(re, &s->gb);
00439
00440 {
00441 int cache = GET_CACHE(re, &s->gb);
00442 int sign = (~cache) >> 31;
00443 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00444 }
00445
00446 LAST_SKIP_BITS(re, &s->gb, code);
00447
00448 if (i > 63) {
00449 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00450 return -1;
00451 }
00452 j = s->scantable.permutated[i];
00453 block[j] = level * quant_matrix[j];
00454 }
00455 } while (i < 63);
00456 CLOSE_READER(re, &s->gb);}
00457
00458 return 0;
00459 }
00460
00461 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
00462 int component, int dc_index,
00463 int16_t *quant_matrix, int Al)
00464 {
00465 int val;
00466 s->dsp.clear_block(block);
00467 val = mjpeg_decode_dc(s, dc_index);
00468 if (val == 0xffff) {
00469 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00470 return -1;
00471 }
00472 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
00473 s->last_dc[component] = val;
00474 block[0] = val;
00475 return 0;
00476 }
00477
00478
00479 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
00480 uint8_t *last_nnz, int ac_index,
00481 int16_t *quant_matrix,
00482 int ss, int se, int Al, int *EOBRUN)
00483 {
00484 int code, i, j, level, val, run;
00485
00486 if (*EOBRUN) {
00487 (*EOBRUN)--;
00488 return 0;
00489 }
00490
00491 {
00492 OPEN_READER(re, &s->gb);
00493 for (i = ss; ; i++) {
00494 UPDATE_CACHE(re, &s->gb);
00495 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00496
00497 run = ((unsigned) code) >> 4;
00498 code &= 0xF;
00499 if (code) {
00500 i += run;
00501 if (code > MIN_CACHE_BITS - 16)
00502 UPDATE_CACHE(re, &s->gb);
00503
00504 {
00505 int cache = GET_CACHE(re, &s->gb);
00506 int sign = (~cache) >> 31;
00507 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00508 }
00509
00510 LAST_SKIP_BITS(re, &s->gb, code);
00511
00512 if (i >= se) {
00513 if (i == se) {
00514 j = s->scantable.permutated[se];
00515 block[j] = level * quant_matrix[j] << Al;
00516 break;
00517 }
00518 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00519 return -1;
00520 }
00521 j = s->scantable.permutated[i];
00522 block[j] = level * quant_matrix[j] << Al;
00523 } else {
00524 if (run == 0xF) {
00525 i += 15;
00526 if (i >= se) {
00527 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
00528 return -1;
00529 }
00530 } else {
00531 val = (1 << run);
00532 if (run) {
00533 UPDATE_CACHE(re, &s->gb);
00534 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
00535 LAST_SKIP_BITS(re, &s->gb, run);
00536 }
00537 *EOBRUN = val - 1;
00538 break;
00539 }
00540 }
00541 }
00542 CLOSE_READER(re, &s->gb);
00543 }
00544
00545 if (i > *last_nnz)
00546 *last_nnz = i;
00547
00548 return 0;
00549 }
00550
00551 #define REFINE_BIT(j) { \
00552 UPDATE_CACHE(re, &s->gb); \
00553 sign = block[j] >> 15; \
00554 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
00555 ((quant_matrix[j] ^ sign) - sign) << Al; \
00556 LAST_SKIP_BITS(re, &s->gb, 1); \
00557 }
00558
00559 #define ZERO_RUN \
00560 for (; ; i++) { \
00561 if (i > last) { \
00562 i += run; \
00563 if (i > se) { \
00564 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
00565 return -1; \
00566 } \
00567 break; \
00568 } \
00569 j = s->scantable.permutated[i]; \
00570 if (block[j]) \
00571 REFINE_BIT(j) \
00572 else if (run-- == 0) \
00573 break; \
00574 }
00575
00576
00577 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
00578 uint8_t *last_nnz,
00579 int ac_index, int16_t *quant_matrix,
00580 int ss, int se, int Al, int *EOBRUN)
00581 {
00582 int code, i = ss, j, sign, val, run;
00583 int last = FFMIN(se, *last_nnz);
00584
00585 OPEN_READER(re, &s->gb);
00586 if (*EOBRUN) {
00587 (*EOBRUN)--;
00588 } else {
00589 for (; ; i++) {
00590 UPDATE_CACHE(re, &s->gb);
00591 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00592
00593 if (code & 0xF) {
00594 run = ((unsigned) code) >> 4;
00595 UPDATE_CACHE(re, &s->gb);
00596 val = SHOW_UBITS(re, &s->gb, 1);
00597 LAST_SKIP_BITS(re, &s->gb, 1);
00598 ZERO_RUN;
00599 j = s->scantable.permutated[i];
00600 val--;
00601 block[j] = ((quant_matrix[j]^val) - val) << Al;
00602 if (i == se) {
00603 if (i > *last_nnz)
00604 *last_nnz = i;
00605 CLOSE_READER(re, &s->gb);
00606 return 0;
00607 }
00608 } else {
00609 run = ((unsigned) code) >> 4;
00610 if (run == 0xF) {
00611 ZERO_RUN;
00612 } else {
00613 val = run;
00614 run = (1 << run);
00615 if (val) {
00616 UPDATE_CACHE(re, &s->gb);
00617 run += SHOW_UBITS(re, &s->gb, val);
00618 LAST_SKIP_BITS(re, &s->gb, val);
00619 }
00620 *EOBRUN = run - 1;
00621 break;
00622 }
00623 }
00624 }
00625
00626 if (i > *last_nnz)
00627 *last_nnz = i;
00628 }
00629
00630 for (; i <= last; i++) {
00631 j = s->scantable.permutated[i];
00632 if (block[j])
00633 REFINE_BIT(j)
00634 }
00635 CLOSE_READER(re, &s->gb);
00636
00637 return 0;
00638 }
00639 #undef REFINE_BIT
00640 #undef ZERO_RUN
00641
00642 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,
00643 int point_transform)
00644 {
00645 int i, mb_x, mb_y;
00646 uint16_t (*buffer)[4];
00647 int left[3], top[3], topleft[3];
00648 const int linesize = s->linesize[0];
00649 const int mask = (1 << s->bits) - 1;
00650
00651 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
00652 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
00653 buffer = s->ljpeg_buffer;
00654
00655 for (i = 0; i < 3; i++)
00656 buffer[0][i] = 1 << (s->bits + point_transform - 1);
00657
00658 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00659 const int modified_predictor = mb_y ? predictor : 1;
00660 uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
00661
00662 if (s->interlaced && s->bottom_field)
00663 ptr += linesize >> 1;
00664
00665 for (i = 0; i < 3; i++)
00666 top[i] = left[i] = topleft[i] = buffer[0][i];
00667
00668 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00669 if (s->restart_interval && !s->restart_count)
00670 s->restart_count = s->restart_interval;
00671
00672 for (i = 0; i < 3; i++) {
00673 int pred;
00674
00675 topleft[i] = top[i];
00676 top[i] = buffer[mb_x][i];
00677
00678 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
00679
00680 left[i] = buffer[mb_x][i] =
00681 mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
00682 }
00683
00684 if (s->restart_interval && !--s->restart_count) {
00685 align_get_bits(&s->gb);
00686 skip_bits(&s->gb, 16);
00687 }
00688 }
00689
00690 if (s->rct) {
00691 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00692 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
00693 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
00694 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
00695 }
00696 } else if (s->pegasus_rct) {
00697 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00698 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
00699 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
00700 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
00701 }
00702 } else {
00703 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00704 ptr[4 * mb_x + 0] = buffer[mb_x][2];
00705 ptr[4 * mb_x + 1] = buffer[mb_x][1];
00706 ptr[4 * mb_x + 2] = buffer[mb_x][0];
00707 }
00708 }
00709 }
00710 return 0;
00711 }
00712
00713 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
00714 int point_transform)
00715 {
00716 int i, mb_x, mb_y;
00717 const int nb_components = 3;
00718
00719 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00720 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00721 if (s->restart_interval && !s->restart_count)
00722 s->restart_count = s->restart_interval;
00723
00724 if (mb_x == 0 || mb_y == 0 || s->interlaced) {
00725 for (i = 0; i < nb_components; i++) {
00726 uint8_t *ptr;
00727 int n, h, v, x, y, c, j, linesize;
00728 n = s->nb_blocks[i];
00729 c = s->comp_index[i];
00730 h = s->h_scount[i];
00731 v = s->v_scount[i];
00732 x = 0;
00733 y = 0;
00734 linesize = s->linesize[c];
00735
00736 for (j = 0; j < n; j++) {
00737 int pred;
00738
00739 ptr = s->picture_ptr->data[c] +
00740 (linesize * (v * mb_y + y)) +
00741 (h * mb_x + x);
00742 if (y == 0 && mb_y == 0) {
00743 if (x == 0 && mb_x == 0)
00744 pred = 128 << point_transform;
00745 else
00746 pred = ptr[-1];
00747 } else {
00748 if (x == 0 && mb_x == 0)
00749 pred = ptr[-linesize];
00750 else
00751 PREDICT(pred, ptr[-linesize - 1],
00752 ptr[-linesize], ptr[-1], predictor);
00753 }
00754
00755 if (s->interlaced && s->bottom_field)
00756 ptr += linesize >> 1;
00757 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00758
00759 if (++x == h) {
00760 x = 0;
00761 y++;
00762 }
00763 }
00764 }
00765 } else {
00766 for (i = 0; i < nb_components; i++) {
00767 uint8_t *ptr;
00768 int n, h, v, x, y, c, j, linesize;
00769 n = s->nb_blocks[i];
00770 c = s->comp_index[i];
00771 h = s->h_scount[i];
00772 v = s->v_scount[i];
00773 x = 0;
00774 y = 0;
00775 linesize = s->linesize[c];
00776
00777 for (j = 0; j < n; j++) {
00778 int pred;
00779
00780
00781 ptr = s->picture_ptr->data[c] +
00782 (linesize * (v * mb_y + y)) +
00783 (h * mb_x + x);
00784 PREDICT(pred, ptr[-linesize - 1],
00785 ptr[-linesize], ptr[-1], predictor);
00786 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
00787 if (++x == h) {
00788 x = 0;
00789 y++;
00790 }
00791 }
00792 }
00793 }
00794 if (s->restart_interval && !--s->restart_count) {
00795 align_get_bits(&s->gb);
00796 skip_bits(&s->gb, 16);
00797 }
00798 }
00799 }
00800 return 0;
00801 }
00802
00803 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
00804 int linesize, int lowres)
00805 {
00806 switch (lowres) {
00807 case 0: copy_block8(dst, src, linesize, linesize, 8);
00808 break;
00809 case 1: copy_block4(dst, src, linesize, linesize, 4);
00810 break;
00811 case 2: copy_block2(dst, src, linesize, linesize, 2);
00812 break;
00813 case 3: *dst = *src;
00814 break;
00815 }
00816 }
00817
00818 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
00819 int Al, const uint8_t *mb_bitmask,
00820 const AVFrame *reference)
00821 {
00822 int i, mb_x, mb_y;
00823 uint8_t *data[MAX_COMPONENTS];
00824 const uint8_t *reference_data[MAX_COMPONENTS];
00825 int linesize[MAX_COMPONENTS];
00826 GetBitContext mb_bitmask_gb;
00827
00828 if (mb_bitmask)
00829 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00830
00831 if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
00832 av_log(s->avctx, AV_LOG_ERROR,
00833 "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
00834 s->flipped = 0;
00835 }
00836
00837 for (i = 0; i < nb_components; i++) {
00838 int c = s->comp_index[i];
00839 data[c] = s->picture_ptr->data[c];
00840 reference_data[c] = reference ? reference->data[c] : NULL;
00841 linesize[c] = s->linesize[c];
00842 s->coefs_finished[c] |= 1;
00843 if (s->flipped) {
00844
00845 int offset = (linesize[c] * (s->v_scount[i] *
00846 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
00847 data[c] += offset;
00848 reference_data[c] += offset;
00849 linesize[c] *= -1;
00850 }
00851 }
00852
00853 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00854 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00855 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
00856
00857 if (s->restart_interval && !s->restart_count)
00858 s->restart_count = s->restart_interval;
00859
00860 if (get_bits_left(&s->gb) < 0) {
00861 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
00862 -get_bits_left(&s->gb));
00863 return -1;
00864 }
00865 for (i = 0; i < nb_components; i++) {
00866 uint8_t *ptr;
00867 int n, h, v, x, y, c, j;
00868 int block_offset;
00869 n = s->nb_blocks[i];
00870 c = s->comp_index[i];
00871 h = s->h_scount[i];
00872 v = s->v_scount[i];
00873 x = 0;
00874 y = 0;
00875 for (j = 0; j < n; j++) {
00876 block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
00877 (h * mb_x + x) * 8) >> s->avctx->lowres);
00878
00879 if (s->interlaced && s->bottom_field)
00880 block_offset += linesize[c] >> 1;
00881 ptr = data[c] + block_offset;
00882 if (!s->progressive) {
00883 if (copy_mb)
00884 mjpeg_copy_block(ptr, reference_data[c] + block_offset,
00885 linesize[c], s->avctx->lowres);
00886 else {
00887 s->dsp.clear_block(s->block);
00888 if (decode_block(s, s->block, i,
00889 s->dc_index[i], s->ac_index[i],
00890 s->quant_matrixes[s->quant_index[c]]) < 0) {
00891 av_log(s->avctx, AV_LOG_ERROR,
00892 "error y=%d x=%d\n", mb_y, mb_x);
00893 return -1;
00894 }
00895 s->dsp.idct_put(ptr, linesize[c], s->block);
00896 }
00897 } else {
00898 int block_idx = s->block_stride[c] * (v * mb_y + y) +
00899 (h * mb_x + x);
00900 DCTELEM *block = s->blocks[c][block_idx];
00901 if (Ah)
00902 block[0] += get_bits1(&s->gb) *
00903 s->quant_matrixes[s->quant_index[c]][0] << Al;
00904 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
00905 s->quant_matrixes[s->quant_index[c]],
00906 Al) < 0) {
00907 av_log(s->avctx, AV_LOG_ERROR,
00908 "error y=%d x=%d\n", mb_y, mb_x);
00909 return -1;
00910 }
00911 }
00912
00913
00914
00915
00916
00917 if (++x == h) {
00918 x = 0;
00919 y++;
00920 }
00921 }
00922 }
00923
00924 if (s->restart_interval) {
00925 s->restart_count--;
00926 i = 8 + ((-get_bits_count(&s->gb)) & 7);
00927
00928 if (show_bits(&s->gb, i) == (1 << i) - 1) {
00929 int pos = get_bits_count(&s->gb);
00930 align_get_bits(&s->gb);
00931 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
00932 skip_bits(&s->gb, 8);
00933 if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
00934 for (i = 0; i < nb_components; i++)
00935 s->last_dc[i] = 1024;
00936 } else
00937 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
00938 }
00939 }
00940 }
00941 }
00942 return 0;
00943 }
00944
00945 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
00946 int se, int Ah, int Al,
00947 const uint8_t *mb_bitmask,
00948 const AVFrame *reference)
00949 {
00950 int mb_x, mb_y;
00951 int EOBRUN = 0;
00952 int c = s->comp_index[0];
00953 uint8_t *data = s->picture_ptr->data[c];
00954 const uint8_t *reference_data = reference ? reference->data[c] : NULL;
00955 int linesize = s->linesize[c];
00956 int last_scan = 0;
00957 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
00958 GetBitContext mb_bitmask_gb;
00959
00960 if (mb_bitmask)
00961 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00962
00963 if (!Al) {
00964 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
00965 last_scan = !~s->coefs_finished[c];
00966 }
00967
00968 if (s->interlaced && s->bottom_field) {
00969 int offset = linesize >> 1;
00970 data += offset;
00971 reference_data += offset;
00972 }
00973
00974 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00975 int block_offset = (mb_y * linesize * 8 >> s->avctx->lowres);
00976 uint8_t *ptr = data + block_offset;
00977 int block_idx = mb_y * s->block_stride[c];
00978 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
00979 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
00980 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
00981 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
00982
00983 if (!copy_mb) {
00984 int ret;
00985 if (Ah)
00986 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
00987 quant_matrix, ss, se, Al, &EOBRUN);
00988 else
00989 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
00990 quant_matrix, ss, se, Al, &EOBRUN);
00991 if (ret < 0) {
00992 av_log(s->avctx, AV_LOG_ERROR,
00993 "error y=%d x=%d\n", mb_y, mb_x);
00994 return -1;
00995 }
00996 }
00997
00998 if (last_scan) {
00999 if (copy_mb) {
01000 mjpeg_copy_block(ptr, reference_data + block_offset,
01001 linesize, s->avctx->lowres);
01002 } else {
01003 s->dsp.idct_put(ptr, linesize, *block);
01004 ptr += 8 >> s->avctx->lowres;
01005 }
01006 }
01007 }
01008 }
01009 return 0;
01010 }
01011
01012 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
01013 const AVFrame *reference)
01014 {
01015 int len, nb_components, i, h, v, predictor, point_transform;
01016 int index, id;
01017 const int block_size = s->lossless ? 1 : 8;
01018 int ilv, prev_shift;
01019
01020
01021 len = get_bits(&s->gb, 16);
01022 nb_components = get_bits(&s->gb, 8);
01023 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
01024 av_log(s->avctx, AV_LOG_ERROR,
01025 "decode_sos: nb_components (%d) unsupported\n", nb_components);
01026 return -1;
01027 }
01028 if (len != 6 + 2 * nb_components) {
01029 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
01030 return -1;
01031 }
01032 for (i = 0; i < nb_components; i++) {
01033 id = get_bits(&s->gb, 8) - 1;
01034 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
01035
01036 for (index = 0; index < s->nb_components; index++)
01037 if (id == s->component_id[index])
01038 break;
01039 if (index == s->nb_components) {
01040 av_log(s->avctx, AV_LOG_ERROR,
01041 "decode_sos: index(%d) out of components\n", index);
01042 return -1;
01043 }
01044
01045 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
01046 && nb_components == 3 && s->nb_components == 3 && i)
01047 index = 3 - i;
01048
01049 s->comp_index[i] = index;
01050
01051 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
01052 s->h_scount[i] = s->h_count[index];
01053 s->v_scount[i] = s->v_count[index];
01054
01055 s->dc_index[i] = get_bits(&s->gb, 4);
01056 s->ac_index[i] = get_bits(&s->gb, 4);
01057
01058 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
01059 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
01060 goto out_of_range;
01061 if (!s->vlcs[0][s->dc_index[i]].table ||
01062 !s->vlcs[1][s->ac_index[i]].table)
01063 goto out_of_range;
01064 }
01065
01066 predictor = get_bits(&s->gb, 8);
01067 ilv = get_bits(&s->gb, 8);
01068 prev_shift = get_bits(&s->gb, 4);
01069 point_transform = get_bits(&s->gb, 4);
01070
01071 for (i = 0; i < nb_components; i++)
01072 s->last_dc[i] = 1024;
01073
01074 if (nb_components > 1) {
01075
01076 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
01077 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
01078 } else if (!s->ls) {
01079 h = s->h_max / s->h_scount[0];
01080 v = s->v_max / s->v_scount[0];
01081 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
01082 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
01083 s->nb_blocks[0] = 1;
01084 s->h_scount[0] = 1;
01085 s->v_scount[0] = 1;
01086 }
01087
01088 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01089 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",
01090 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
01091 predictor, point_transform, ilv, s->bits,
01092 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
01093
01094
01095
01096 for (i = s->mjpb_skiptosod; i > 0; i--)
01097 skip_bits(&s->gb, 8);
01098
01099 if (s->lossless) {
01100 if (CONFIG_JPEGLS_DECODER && s->ls) {
01101
01102
01103
01104 if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
01105 return -1;
01106 } else {
01107 if (s->rgb) {
01108 if (ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
01109 return -1;
01110 } else {
01111 if (ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
01112 return -1;
01113 }
01114 }
01115 } else {
01116 if (s->progressive && predictor) {
01117 if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
01118 point_transform,
01119 mb_bitmask, reference) < 0)
01120 return -1;
01121 } else {
01122 if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
01123 mb_bitmask, reference) < 0)
01124 return -1;
01125 }
01126 }
01127 emms_c();
01128 return 0;
01129 out_of_range:
01130 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
01131 return -1;
01132 }
01133
01134 static int mjpeg_decode_dri(MJpegDecodeContext *s)
01135 {
01136 if (get_bits(&s->gb, 16) != 4)
01137 return -1;
01138 s->restart_interval = get_bits(&s->gb, 16);
01139 s->restart_count = 0;
01140 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
01141 s->restart_interval);
01142
01143 return 0;
01144 }
01145
01146 static int mjpeg_decode_app(MJpegDecodeContext *s)
01147 {
01148 int len, id, i;
01149
01150 len = get_bits(&s->gb, 16);
01151 if (len < 5)
01152 return -1;
01153 if (8 * len > get_bits_left(&s->gb))
01154 return -1;
01155
01156 id = get_bits_long(&s->gb, 32);
01157 id = av_be2ne32(id);
01158 len -= 6;
01159
01160 if (s->avctx->debug & FF_DEBUG_STARTCODE)
01161 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
01162
01163
01164
01165
01166 if (id == AV_RL32("AVI1")) {
01167
01168
01169
01170
01171
01172
01173
01174 s->buggy_avid = 1;
01175
01176
01177 i = get_bits(&s->gb, 8);
01178 if (i == 2)
01179 s->bottom_field = 1;
01180 else if (i == 1)
01181 s->bottom_field = 0;
01182 #if 0
01183 skip_bits(&s->gb, 8);
01184 skip_bits(&s->gb, 32);
01185 skip_bits(&s->gb, 32);
01186 len -= 10;
01187 #endif
01188
01189
01190 goto out;
01191 }
01192
01193
01194
01195 if (id == AV_RL32("JFIF")) {
01196 int t_w, t_h, v1, v2;
01197 skip_bits(&s->gb, 8);
01198 v1 = get_bits(&s->gb, 8);
01199 v2 = get_bits(&s->gb, 8);
01200 skip_bits(&s->gb, 8);
01201
01202 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
01203 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
01204
01205 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01206 av_log(s->avctx, AV_LOG_INFO,
01207 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
01208 v1, v2,
01209 s->avctx->sample_aspect_ratio.num,
01210 s->avctx->sample_aspect_ratio.den);
01211
01212 t_w = get_bits(&s->gb, 8);
01213 t_h = get_bits(&s->gb, 8);
01214 if (t_w && t_h) {
01215
01216 if (len -10 - (t_w * t_h * 3) > 0)
01217 len -= t_w * t_h * 3;
01218 }
01219 len -= 10;
01220 goto out;
01221 }
01222
01223 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
01224 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01225 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
01226 skip_bits(&s->gb, 16);
01227 skip_bits(&s->gb, 16);
01228 skip_bits(&s->gb, 16);
01229 skip_bits(&s->gb, 8);
01230 len -= 7;
01231 goto out;
01232 }
01233
01234 if (id == AV_RL32("LJIF")) {
01235 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01236 av_log(s->avctx, AV_LOG_INFO,
01237 "Pegasus lossless jpeg header found\n");
01238 skip_bits(&s->gb, 16);
01239 skip_bits(&s->gb, 16);
01240 skip_bits(&s->gb, 16);
01241 skip_bits(&s->gb, 16);
01242 switch (get_bits(&s->gb, 8)) {
01243 case 1:
01244 s->rgb = 1;
01245 s->pegasus_rct = 0;
01246 break;
01247 case 2:
01248 s->rgb = 1;
01249 s->pegasus_rct = 1;
01250 break;
01251 default:
01252 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
01253 }
01254 len -= 9;
01255 goto out;
01256 }
01257
01258
01259 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
01260 id = get_bits_long(&s->gb, 32);
01261 id = av_be2ne32(id);
01262 len -= 4;
01263
01264 if (id == AV_RL32("mjpg")) {
01265 #if 0
01266 skip_bits(&s->gb, 32);
01267 skip_bits(&s->gb, 32);
01268 skip_bits(&s->gb, 32);
01269 skip_bits(&s->gb, 32);
01270 skip_bits(&s->gb, 32);
01271 skip_bits(&s->gb, 32);
01272 skip_bits(&s->gb, 32);
01273 skip_bits(&s->gb, 32);
01274 #endif
01275 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01276 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
01277 }
01278 }
01279
01280 out:
01281
01282 if (len < 0)
01283 av_log(s->avctx, AV_LOG_ERROR,
01284 "mjpeg: error, decode_app parser read over the end\n");
01285 while (--len > 0)
01286 skip_bits(&s->gb, 8);
01287
01288 return 0;
01289 }
01290
01291 static int mjpeg_decode_com(MJpegDecodeContext *s)
01292 {
01293 int len = get_bits(&s->gb, 16);
01294 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
01295 char *cbuf = av_malloc(len - 1);
01296 if (cbuf) {
01297 int i;
01298 for (i = 0; i < len - 2; i++)
01299 cbuf[i] = get_bits(&s->gb, 8);
01300 if (i > 0 && cbuf[i - 1] == '\n')
01301 cbuf[i - 1] = 0;
01302 else
01303 cbuf[i] = 0;
01304
01305 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01306 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
01307
01308
01309 if (!strcmp(cbuf, "AVID")) {
01310 s->buggy_avid = 1;
01311
01312
01313 } else if (!strcmp(cbuf, "CS=ITU601"))
01314 s->cs_itu601 = 1;
01315 else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
01316 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
01317 s->flipped = 1;
01318
01319 av_free(cbuf);
01320 }
01321 }
01322
01323 return 0;
01324 }
01325
01326
01327
01328 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
01329 {
01330 const uint8_t *buf_ptr;
01331 unsigned int v, v2;
01332 int val;
01333 #ifdef DEBUG
01334 int skipped = 0;
01335 #endif
01336
01337 buf_ptr = *pbuf_ptr;
01338 while (buf_ptr < buf_end) {
01339 v = *buf_ptr++;
01340 v2 = *buf_ptr;
01341 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
01342 val = *buf_ptr++;
01343 goto found;
01344 }
01345 #ifdef DEBUG
01346 skipped++;
01347 #endif
01348 }
01349 val = -1;
01350 found:
01351 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
01352 *pbuf_ptr = buf_ptr;
01353 return val;
01354 }
01355
01356 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
01357 const uint8_t **buf_ptr, const uint8_t *buf_end,
01358 const uint8_t **unescaped_buf_ptr,
01359 int *unescaped_buf_size)
01360 {
01361 int start_code;
01362 start_code = find_marker(buf_ptr, buf_end);
01363
01364 if ((buf_end - *buf_ptr) > s->buffer_size) {
01365 av_free(s->buffer);
01366 s->buffer_size = buf_end - *buf_ptr;
01367 s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
01368 av_log(s->avctx, AV_LOG_DEBUG,
01369 "buffer too small, expanding to %d bytes\n", s->buffer_size);
01370 }
01371
01372
01373 if (start_code == SOS && !s->ls) {
01374 const uint8_t *src = *buf_ptr;
01375 uint8_t *dst = s->buffer;
01376
01377 while (src < buf_end) {
01378 uint8_t x = *(src++);
01379
01380 *(dst++) = x;
01381 if (s->avctx->codec_id != CODEC_ID_THP) {
01382 if (x == 0xff) {
01383 while (src < buf_end && x == 0xff)
01384 x = *(src++);
01385
01386 if (x >= 0xd0 && x <= 0xd7)
01387 *(dst++) = x;
01388 else if (x)
01389 break;
01390 }
01391 }
01392 }
01393 *unescaped_buf_ptr = s->buffer;
01394 *unescaped_buf_size = dst - s->buffer;
01395
01396 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
01397 (buf_end - *buf_ptr) - (dst - s->buffer));
01398 } else if (start_code == SOS && s->ls) {
01399 const uint8_t *src = *buf_ptr;
01400 uint8_t *dst = s->buffer;
01401 int bit_count = 0;
01402 int t = 0, b = 0;
01403 PutBitContext pb;
01404
01405 s->cur_scan++;
01406
01407
01408 while (src + t < buf_end) {
01409 uint8_t x = src[t++];
01410 if (x == 0xff) {
01411 while ((src + t < buf_end) && x == 0xff)
01412 x = src[t++];
01413 if (x & 0x80) {
01414 t -= 2;
01415 break;
01416 }
01417 }
01418 }
01419 bit_count = t * 8;
01420 init_put_bits(&pb, dst, t);
01421
01422
01423 while (b < t) {
01424 uint8_t x = src[b++];
01425 put_bits(&pb, 8, x);
01426 if (x == 0xFF) {
01427 x = src[b++];
01428 put_bits(&pb, 7, x);
01429 bit_count--;
01430 }
01431 }
01432 flush_put_bits(&pb);
01433
01434 *unescaped_buf_ptr = dst;
01435 *unescaped_buf_size = (bit_count + 7) >> 3;
01436 } else {
01437 *unescaped_buf_ptr = *buf_ptr;
01438 *unescaped_buf_size = buf_end - *buf_ptr;
01439 }
01440
01441 return start_code;
01442 }
01443
01444 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
01445 AVPacket *avpkt)
01446 {
01447 const uint8_t *buf = avpkt->data;
01448 int buf_size = avpkt->size;
01449 MJpegDecodeContext *s = avctx->priv_data;
01450 const uint8_t *buf_end, *buf_ptr;
01451 const uint8_t *unescaped_buf_ptr;
01452 int unescaped_buf_size;
01453 int start_code;
01454 AVFrame *picture = data;
01455
01456 s->got_picture = 0;
01457 buf_ptr = buf;
01458 buf_end = buf + buf_size;
01459 while (buf_ptr < buf_end) {
01460
01461 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
01462 &unescaped_buf_ptr,
01463 &unescaped_buf_size);
01464
01465 if (start_code < 0) {
01466 goto the_end;
01467 } else if (unescaped_buf_size > (1U<<29)) {
01468 av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
01469 start_code, unescaped_buf_ptr, buf_size);
01470 return AVERROR_INVALIDDATA;
01471 } else {
01472 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
01473 start_code, buf_end - buf_ptr);
01474
01475 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
01476
01477 s->start_code = start_code;
01478 if (s->avctx->debug & FF_DEBUG_STARTCODE)
01479 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
01480
01481
01482 if (start_code >= 0xd0 && start_code <= 0xd7)
01483 av_log(avctx, AV_LOG_DEBUG,
01484 "restart marker: %d\n", start_code & 0x0f);
01485
01486 else if (start_code >= APP0 && start_code <= APP15)
01487 mjpeg_decode_app(s);
01488
01489 else if (start_code == COM)
01490 mjpeg_decode_com(s);
01491
01492 switch (start_code) {
01493 case SOI:
01494 s->restart_interval = 0;
01495 s->restart_count = 0;
01496
01497 break;
01498 case DQT:
01499 ff_mjpeg_decode_dqt(s);
01500 break;
01501 case DHT:
01502 if (ff_mjpeg_decode_dht(s) < 0) {
01503 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
01504 return -1;
01505 }
01506 break;
01507 case SOF0:
01508 case SOF1:
01509 s->lossless = 0;
01510 s->ls = 0;
01511 s->progressive = 0;
01512 if (ff_mjpeg_decode_sof(s) < 0)
01513 return -1;
01514 break;
01515 case SOF2:
01516 s->lossless = 0;
01517 s->ls = 0;
01518 s->progressive = 1;
01519 if (ff_mjpeg_decode_sof(s) < 0)
01520 return -1;
01521 break;
01522 case SOF3:
01523 s->lossless = 1;
01524 s->ls = 0;
01525 s->progressive = 0;
01526 if (ff_mjpeg_decode_sof(s) < 0)
01527 return -1;
01528 break;
01529 case SOF48:
01530 s->lossless = 1;
01531 s->ls = 1;
01532 s->progressive = 0;
01533 if (ff_mjpeg_decode_sof(s) < 0)
01534 return -1;
01535 break;
01536 case LSE:
01537 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
01538 return -1;
01539 break;
01540 case EOI:
01541 s->cur_scan = 0;
01542 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01543 break;
01544 eoi_parser:
01545 if (!s->got_picture) {
01546 av_log(avctx, AV_LOG_WARNING,
01547 "Found EOI before any SOF, ignoring\n");
01548 break;
01549 }
01550 if (s->interlaced) {
01551 s->bottom_field ^= 1;
01552
01553 if (s->bottom_field == !s->interlace_polarity)
01554 goto not_the_end;
01555 }
01556 *picture = *s->picture_ptr;
01557 *data_size = sizeof(AVFrame);
01558
01559 if (!s->lossless) {
01560 picture->quality = FFMAX3(s->qscale[0],
01561 s->qscale[1],
01562 s->qscale[2]);
01563 picture->qstride = 0;
01564 picture->qscale_table = s->qscale_table;
01565 memset(picture->qscale_table, picture->quality,
01566 (s->width + 15) / 16);
01567 if (avctx->debug & FF_DEBUG_QP)
01568 av_log(avctx, AV_LOG_DEBUG,
01569 "QP: %d\n", picture->quality);
01570 picture->quality *= FF_QP2LAMBDA;
01571 }
01572
01573 goto the_end;
01574 case SOS:
01575 if (!s->got_picture) {
01576 av_log(avctx, AV_LOG_WARNING,
01577 "Can not process SOS before SOF, skipping\n");
01578 break;
01579 }
01580 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
01581 (avctx->err_recognition & AV_EF_EXPLODE))
01582 return AVERROR_INVALIDDATA;
01583
01584
01585 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
01586 goto eoi_parser;
01587 break;
01588 case DRI:
01589 mjpeg_decode_dri(s);
01590 break;
01591 case SOF5:
01592 case SOF6:
01593 case SOF7:
01594 case SOF9:
01595 case SOF10:
01596 case SOF11:
01597 case SOF13:
01598 case SOF14:
01599 case SOF15:
01600 case JPG:
01601 av_log(avctx, AV_LOG_ERROR,
01602 "mjpeg: unsupported coding type (%x)\n", start_code);
01603 break;
01604
01605
01606
01607 }
01608
01609 not_the_end:
01610
01611 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
01612 av_log(avctx, AV_LOG_DEBUG,
01613 "marker parser used %d bytes (%d bits)\n",
01614 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
01615 }
01616 }
01617 if (s->got_picture) {
01618 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
01619 goto eoi_parser;
01620 }
01621 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
01622 return -1;
01623 the_end:
01624 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
01625 buf_end - buf_ptr);
01626
01627 return buf_ptr - buf;
01628 }
01629
01630 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
01631 {
01632 MJpegDecodeContext *s = avctx->priv_data;
01633 int i, j;
01634
01635 if (s->picture_ptr && s->picture_ptr->data[0])
01636 avctx->release_buffer(avctx, s->picture_ptr);
01637
01638 av_free(s->buffer);
01639 av_free(s->qscale_table);
01640 av_freep(&s->ljpeg_buffer);
01641 s->ljpeg_buffer_size = 0;
01642
01643 for (i = 0; i < 3; i++) {
01644 for (j = 0; j < 4; j++)
01645 free_vlc(&s->vlcs[i][j]);
01646 }
01647 for (i = 0; i < MAX_COMPONENTS; i++) {
01648 av_freep(&s->blocks[i]);
01649 av_freep(&s->last_nnz[i]);
01650 }
01651 return 0;
01652 }
01653
01654 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
01655 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
01656 static const AVOption options[] = {
01657 { "extern_huff", "Use external huffman table.",
01658 OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
01659 { NULL },
01660 };
01661
01662 static const AVClass mjpegdec_class = {
01663 .class_name = "MJPEG decoder",
01664 .item_name = av_default_item_name,
01665 .option = options,
01666 .version = LIBAVUTIL_VERSION_INT,
01667 };
01668
01669 AVCodec ff_mjpeg_decoder = {
01670 .name = "mjpeg",
01671 .type = AVMEDIA_TYPE_VIDEO,
01672 .id = CODEC_ID_MJPEG,
01673 .priv_data_size = sizeof(MJpegDecodeContext),
01674 .init = ff_mjpeg_decode_init,
01675 .close = ff_mjpeg_decode_end,
01676 .decode = ff_mjpeg_decode_frame,
01677 .capabilities = CODEC_CAP_DR1,
01678 .max_lowres = 3,
01679 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
01680 .priv_class = &mjpegdec_class,
01681 };
01682
01683 AVCodec ff_thp_decoder = {
01684 .name = "thp",
01685 .type = AVMEDIA_TYPE_VIDEO,
01686 .id = CODEC_ID_THP,
01687 .priv_data_size = sizeof(MJpegDecodeContext),
01688 .init = ff_mjpeg_decode_init,
01689 .close = ff_mjpeg_decode_end,
01690 .decode = ff_mjpeg_decode_frame,
01691 .capabilities = CODEC_CAP_DR1,
01692 .max_lowres = 3,
01693 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
01694 };