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