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00033 #include "libavutil/imgutils.h"
00034 #include "libavutil/avassert.h"
00035 #include "libavutil/opt.h"
00036 #include "avcodec.h"
00037 #include "dsputil.h"
00038 #include "internal.h"
00039 #include "mjpeg.h"
00040 #include "mjpegdec.h"
00041 #include "jpeglsdec.h"
00042
00043
00044 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
00045 const uint8_t *val_table, int nb_codes,
00046 int use_static, int is_ac)
00047 {
00048 uint8_t huff_size[256] = { 0 };
00049 uint16_t huff_code[256];
00050 uint16_t huff_sym[256];
00051 int i;
00052
00053 av_assert0(nb_codes <= 256);
00054
00055 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
00056
00057 for (i = 0; i < 256; i++)
00058 huff_sym[i] = i + 16 * is_ac;
00059
00060 if (is_ac)
00061 huff_sym[0] = 16 * 256;
00062
00063 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
00064 huff_code, 2, 2, huff_sym, 2, 2, use_static);
00065 }
00066
00067 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
00068 {
00069 build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
00070 avpriv_mjpeg_val_dc, 12, 0, 0);
00071 build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
00072 avpriv_mjpeg_val_dc, 12, 0, 0);
00073 build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
00074 avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
00075 build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
00076 avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
00077 build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
00078 avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
00079 build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
00080 avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
00081 }
00082
00083 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
00084 {
00085 MJpegDecodeContext *s = avctx->priv_data;
00086
00087 if (!s->picture_ptr)
00088 s->picture_ptr = &s->picture;
00089 avcodec_get_frame_defaults(&s->picture);
00090
00091 s->avctx = avctx;
00092 ff_dsputil_init(&s->dsp, avctx);
00093 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
00094 s->buffer_size = 0;
00095 s->buffer = NULL;
00096 s->start_code = -1;
00097 s->first_picture = 1;
00098 s->got_picture = 0;
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 (s->extern_huff) {
00105 av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
00106 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
00107 if (ff_mjpeg_decode_dht(s)) {
00108 av_log(avctx, AV_LOG_ERROR,
00109 "error using external huffman table, switching back to internal\n");
00110 build_basic_mjpeg_vlc(s);
00111 }
00112 }
00113 if (avctx->field_order == AV_FIELD_BB) {
00114 s->interlace_polarity = 1;
00115 av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
00116 }
00117 if (avctx->codec->id == AV_CODEC_ID_AMV)
00118 s->flipped = 1;
00119
00120 return 0;
00121 }
00122
00123
00124
00125 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
00126 {
00127 int len, index, i, j;
00128
00129 len = get_bits(&s->gb, 16) - 2;
00130
00131 while (len >= 65) {
00132
00133 if (get_bits(&s->gb, 4) != 0) {
00134 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
00135 return -1;
00136 }
00137 index = get_bits(&s->gb, 4);
00138 if (index >= 4)
00139 return -1;
00140 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
00141
00142 for (i = 0; i < 64; i++) {
00143 j = s->scantable.permutated[i];
00144 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
00145 }
00146
00147
00148 s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
00149 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
00150 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
00151 index, s->qscale[index]);
00152 len -= 65;
00153 }
00154 return 0;
00155 }
00156
00157
00158 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
00159 {
00160 int len, index, i, class, n, v, code_max;
00161 uint8_t bits_table[17];
00162 uint8_t val_table[256];
00163 int ret = 0;
00164
00165 len = get_bits(&s->gb, 16) - 2;
00166
00167 while (len > 0) {
00168 if (len < 17)
00169 return AVERROR_INVALIDDATA;
00170 class = get_bits(&s->gb, 4);
00171 if (class >= 2)
00172 return AVERROR_INVALIDDATA;
00173 index = get_bits(&s->gb, 4);
00174 if (index >= 4)
00175 return AVERROR_INVALIDDATA;
00176 n = 0;
00177 for (i = 1; i <= 16; i++) {
00178 bits_table[i] = get_bits(&s->gb, 8);
00179 n += bits_table[i];
00180 }
00181 len -= 17;
00182 if (len < n || n > 256)
00183 return AVERROR_INVALIDDATA;
00184
00185 code_max = 0;
00186 for (i = 0; i < n; i++) {
00187 v = get_bits(&s->gb, 8);
00188 if (v > code_max)
00189 code_max = v;
00190 val_table[i] = v;
00191 }
00192 len -= n;
00193
00194
00195 ff_free_vlc(&s->vlcs[class][index]);
00196 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
00197 class, index, code_max + 1);
00198 if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
00199 code_max + 1, 0, class > 0)) < 0)
00200 return ret;
00201
00202 if (class > 0) {
00203 ff_free_vlc(&s->vlcs[2][index]);
00204 if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
00205 code_max + 1, 0, 0)) < 0)
00206 return ret;
00207 }
00208 }
00209 return 0;
00210 }
00211
00212 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
00213 {
00214 int len, nb_components, i, width, height, pix_fmt_id;
00215 int h_count[MAX_COMPONENTS];
00216 int v_count[MAX_COMPONENTS];
00217
00218 s->cur_scan = 0;
00219 s->upscale_h = s->upscale_v = 0;
00220
00221
00222 len = get_bits(&s->gb, 16);
00223 s->bits = get_bits(&s->gb, 8);
00224
00225 if (s->pegasus_rct)
00226 s->bits = 9;
00227 if (s->bits == 9 && !s->pegasus_rct)
00228 s->rct = 1;
00229
00230 if (s->bits != 8 && !s->lossless) {
00231 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
00232 return -1;
00233 }
00234
00235 if(s->lossless && s->avctx->lowres){
00236 av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
00237 return -1;
00238 }
00239
00240 height = get_bits(&s->gb, 16);
00241 width = get_bits(&s->gb, 16);
00242
00243
00244 if (s->interlaced && s->width == width && s->height == height + 1)
00245 height= s->height;
00246
00247 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
00248 if (av_image_check_size(width, height, 0, s->avctx))
00249 return AVERROR_INVALIDDATA;
00250
00251 nb_components = get_bits(&s->gb, 8);
00252 if (nb_components <= 0 ||
00253 nb_components > MAX_COMPONENTS)
00254 return -1;
00255 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
00256 if (nb_components != s->nb_components) {
00257 av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
00258 return AVERROR_INVALIDDATA;
00259 }
00260 }
00261 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
00262 av_log_missing_feature(s->avctx,
00263 "For JPEG-LS anything except <= 8 bits/component"
00264 " or 16-bit gray", 0);
00265 return AVERROR_PATCHWELCOME;
00266 }
00267 s->nb_components = nb_components;
00268 s->h_max = 1;
00269 s->v_max = 1;
00270 memset(h_count, 0, sizeof(h_count));
00271 memset(v_count, 0, sizeof(v_count));
00272 for (i = 0; i < nb_components; i++) {
00273
00274 s->component_id[i] = get_bits(&s->gb, 8) - 1;
00275 h_count[i] = get_bits(&s->gb, 4);
00276 v_count[i] = get_bits(&s->gb, 4);
00277
00278 if (h_count[i] > s->h_max)
00279 s->h_max = h_count[i];
00280 if (v_count[i] > s->v_max)
00281 s->v_max = v_count[i];
00282 if (!h_count[i] || !v_count[i]) {
00283 av_log(s->avctx, AV_LOG_ERROR, "h/v_count is 0\n");
00284 return -1;
00285 }
00286 s->quant_index[i] = get_bits(&s->gb, 8);
00287 if (s->quant_index[i] >= 4) {
00288 av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
00289 return AVERROR_INVALIDDATA;
00290 }
00291 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
00292 i, h_count[i], v_count[i],
00293 s->component_id[i], s->quant_index[i]);
00294 }
00295
00296 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
00297 av_log_missing_feature(s->avctx, "Subsampling in JPEG-LS", 0);
00298 return AVERROR_PATCHWELCOME;
00299 }
00300
00301 if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
00302 s->rgb = 1;
00303
00304
00305 if ( width != s->width || height != s->height
00306 || memcmp(s->h_count, h_count, sizeof(h_count[0])*nb_components)
00307 || memcmp(s->v_count, v_count, sizeof(v_count[0])*nb_components)) {
00308 av_freep(&s->qscale_table);
00309
00310 s->width = width;
00311 s->height = height;
00312 memcpy(s->h_count, h_count, sizeof(h_count));
00313 memcpy(s->v_count, v_count, sizeof(v_count));
00314 s->interlaced = 0;
00315 s->got_picture = 0;
00316
00317
00318 if (s->first_picture &&
00319 s->org_height != 0 &&
00320 s->height < ((s->org_height * 3) / 4)) {
00321 s->interlaced = 1;
00322 s->bottom_field = s->interlace_polarity;
00323 s->picture_ptr->interlaced_frame = 1;
00324 s->picture_ptr->top_field_first = !s->interlace_polarity;
00325 height *= 2;
00326 }
00327
00328 avcodec_set_dimensions(s->avctx, width, height);
00329
00330 s->qscale_table = av_mallocz((s->width + 15) / 16);
00331 s->first_picture = 0;
00332 }
00333
00334 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
00335 if (s->progressive) {
00336 av_log_ask_for_sample(s->avctx, "progressively coded interlaced pictures not supported\n");
00337 return AVERROR_INVALIDDATA;
00338 }
00339 } else{
00340
00341 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
00342 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
00343 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
00344 (s->h_count[3] << 4) | s->v_count[3];
00345 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
00346
00347
00348 if (!(pix_fmt_id & 0xD0D0D0D0))
00349 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
00350 if (!(pix_fmt_id & 0x0D0D0D0D))
00351 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
00352
00353 switch (pix_fmt_id) {
00354 case 0x11111100:
00355 if (s->rgb)
00356 s->avctx->pix_fmt = AV_PIX_FMT_BGR24;
00357 else {
00358 if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
00359 s->avctx->pix_fmt = AV_PIX_FMT_GBR24P;
00360 } else {
00361 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
00362 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00363 }
00364 }
00365 av_assert0(s->nb_components == 3);
00366 break;
00367 case 0x12121100:
00368 case 0x22122100:
00369 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
00370 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00371 s->upscale_v = 2;
00372 s->upscale_h = (pix_fmt_id == 0x22122100);
00373 s->chroma_height = s->height;
00374 break;
00375 case 0x21211100:
00376 case 0x22211200:
00377 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
00378 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00379 s->upscale_v = (pix_fmt_id == 0x22211200);
00380 s->upscale_h = 2;
00381 s->chroma_height = s->height;
00382 break;
00383 case 0x22221100:
00384 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
00385 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00386 s->upscale_v = 2;
00387 s->upscale_h = 2;
00388 s->chroma_height = s->height / 2;
00389 break;
00390 case 0x11000000:
00391 case 0x13000000:
00392 case 0x14000000:
00393 case 0x31000000:
00394 case 0x33000000:
00395 case 0x34000000:
00396 case 0x41000000:
00397 case 0x43000000:
00398 case 0x44000000:
00399 if(s->bits <= 8)
00400 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
00401 else
00402 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
00403 break;
00404 case 0x12111100:
00405 case 0x22211100:
00406 case 0x22112100:
00407 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
00408 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00409 s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
00410 s->chroma_height = s->height / 2;
00411 break;
00412 case 0x21111100:
00413 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
00414 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00415 break;
00416 case 0x22121100:
00417 case 0x22111200:
00418 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
00419 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00420 s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
00421 break;
00422 case 0x22111100:
00423 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
00424 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00425 break;
00426 default:
00427 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
00428 return AVERROR_PATCHWELCOME;
00429 }
00430 if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
00431 av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
00432 return AVERROR_PATCHWELCOME;
00433 }
00434 if (s->ls) {
00435 s->upscale_h = s->upscale_v = 0;
00436 if (s->nb_components > 1)
00437 s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
00438 else if (s->bits <= 8)
00439 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
00440 else
00441 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
00442 }
00443
00444 if (s->picture_ptr->data[0])
00445 s->avctx->release_buffer(s->avctx, s->picture_ptr);
00446
00447 if (ff_get_buffer(s->avctx, s->picture_ptr) < 0) {
00448 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00449 return -1;
00450 }
00451 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
00452 s->picture_ptr->key_frame = 1;
00453 s->got_picture = 1;
00454
00455 for (i = 0; i < 3; i++)
00456 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
00457
00458 av_dlog(s->avctx, "%d %d %d %d %d %d\n",
00459 s->width, s->height, s->linesize[0], s->linesize[1],
00460 s->interlaced, s->avctx->height);
00461
00462 if (len != (8 + (3 * nb_components)))
00463 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
00464 }
00465
00466
00467 if (s->progressive) {
00468 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
00469 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
00470 for (i = 0; i < s->nb_components; i++) {
00471 int size = bw * bh * s->h_count[i] * s->v_count[i];
00472 av_freep(&s->blocks[i]);
00473 av_freep(&s->last_nnz[i]);
00474 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
00475 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
00476 s->block_stride[i] = bw * s->h_count[i];
00477 }
00478 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
00479 }
00480 return 0;
00481 }
00482
00483 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
00484 {
00485 int code;
00486 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
00487 if (code < 0) {
00488 av_log(s->avctx, AV_LOG_WARNING,
00489 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
00490 0, dc_index, &s->vlcs[0][dc_index]);
00491 return 0xffff;
00492 }
00493
00494 if (code)
00495 return get_xbits(&s->gb, code);
00496 else
00497 return 0;
00498 }
00499
00500
00501 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
00502 int dc_index, int ac_index, int16_t *quant_matrix)
00503 {
00504 int code, i, j, level, val;
00505
00506
00507 val = mjpeg_decode_dc(s, dc_index);
00508 if (val == 0xffff) {
00509 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00510 return AVERROR_INVALIDDATA;
00511 }
00512 val = val * quant_matrix[0] + s->last_dc[component];
00513 s->last_dc[component] = val;
00514 block[0] = val;
00515
00516 i = 0;
00517 {OPEN_READER(re, &s->gb);
00518 do {
00519 UPDATE_CACHE(re, &s->gb);
00520 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
00521
00522 i += ((unsigned)code) >> 4;
00523 code &= 0xf;
00524 if (code) {
00525 if (code > MIN_CACHE_BITS - 16)
00526 UPDATE_CACHE(re, &s->gb);
00527
00528 {
00529 int cache = GET_CACHE(re, &s->gb);
00530 int sign = (~cache) >> 31;
00531 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00532 }
00533
00534 LAST_SKIP_BITS(re, &s->gb, code);
00535
00536 if (i > 63) {
00537 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00538 return AVERROR_INVALIDDATA;
00539 }
00540 j = s->scantable.permutated[i];
00541 block[j] = level * quant_matrix[j];
00542 }
00543 } while (i < 63);
00544 CLOSE_READER(re, &s->gb);}
00545
00546 return 0;
00547 }
00548
00549 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
00550 int component, int dc_index,
00551 int16_t *quant_matrix, int Al)
00552 {
00553 int val;
00554 s->dsp.clear_block(block);
00555 val = mjpeg_decode_dc(s, dc_index);
00556 if (val == 0xffff) {
00557 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
00558 return AVERROR_INVALIDDATA;
00559 }
00560 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
00561 s->last_dc[component] = val;
00562 block[0] = val;
00563 return 0;
00564 }
00565
00566
00567 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
00568 uint8_t *last_nnz, int ac_index,
00569 int16_t *quant_matrix,
00570 int ss, int se, int Al, int *EOBRUN)
00571 {
00572 int code, i, j, level, val, run;
00573
00574 if (*EOBRUN) {
00575 (*EOBRUN)--;
00576 return 0;
00577 }
00578
00579 {
00580 OPEN_READER(re, &s->gb);
00581 for (i = ss; ; i++) {
00582 UPDATE_CACHE(re, &s->gb);
00583 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00584
00585 run = ((unsigned) code) >> 4;
00586 code &= 0xF;
00587 if (code) {
00588 i += run;
00589 if (code > MIN_CACHE_BITS - 16)
00590 UPDATE_CACHE(re, &s->gb);
00591
00592 {
00593 int cache = GET_CACHE(re, &s->gb);
00594 int sign = (~cache) >> 31;
00595 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
00596 }
00597
00598 LAST_SKIP_BITS(re, &s->gb, code);
00599
00600 if (i >= se) {
00601 if (i == se) {
00602 j = s->scantable.permutated[se];
00603 block[j] = level * quant_matrix[j] << Al;
00604 break;
00605 }
00606 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
00607 return AVERROR_INVALIDDATA;
00608 }
00609 j = s->scantable.permutated[i];
00610 block[j] = level * quant_matrix[j] << Al;
00611 } else {
00612 if (run == 0xF) {
00613 i += 15;
00614 if (i >= se) {
00615 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
00616 return AVERROR_INVALIDDATA;
00617 }
00618 } else {
00619 val = (1 << run);
00620 if (run) {
00621 UPDATE_CACHE(re, &s->gb);
00622 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
00623 LAST_SKIP_BITS(re, &s->gb, run);
00624 }
00625 *EOBRUN = val - 1;
00626 break;
00627 }
00628 }
00629 }
00630 CLOSE_READER(re, &s->gb);
00631 }
00632
00633 if (i > *last_nnz)
00634 *last_nnz = i;
00635
00636 return 0;
00637 }
00638
00639 #define REFINE_BIT(j) { \
00640 UPDATE_CACHE(re, &s->gb); \
00641 sign = block[j] >> 15; \
00642 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
00643 ((quant_matrix[j] ^ sign) - sign) << Al; \
00644 LAST_SKIP_BITS(re, &s->gb, 1); \
00645 }
00646
00647 #define ZERO_RUN \
00648 for (; ; i++) { \
00649 if (i > last) { \
00650 i += run; \
00651 if (i > se) { \
00652 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
00653 return -1; \
00654 } \
00655 break; \
00656 } \
00657 j = s->scantable.permutated[i]; \
00658 if (block[j]) \
00659 REFINE_BIT(j) \
00660 else if (run-- == 0) \
00661 break; \
00662 }
00663
00664
00665 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
00666 uint8_t *last_nnz,
00667 int ac_index, int16_t *quant_matrix,
00668 int ss, int se, int Al, int *EOBRUN)
00669 {
00670 int code, i = ss, j, sign, val, run;
00671 int last = FFMIN(se, *last_nnz);
00672
00673 OPEN_READER(re, &s->gb);
00674 if (*EOBRUN) {
00675 (*EOBRUN)--;
00676 } else {
00677 for (; ; i++) {
00678 UPDATE_CACHE(re, &s->gb);
00679 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
00680
00681 if (code & 0xF) {
00682 run = ((unsigned) code) >> 4;
00683 UPDATE_CACHE(re, &s->gb);
00684 val = SHOW_UBITS(re, &s->gb, 1);
00685 LAST_SKIP_BITS(re, &s->gb, 1);
00686 ZERO_RUN;
00687 j = s->scantable.permutated[i];
00688 val--;
00689 block[j] = ((quant_matrix[j]^val) - val) << Al;
00690 if (i == se) {
00691 if (i > *last_nnz)
00692 *last_nnz = i;
00693 CLOSE_READER(re, &s->gb);
00694 return 0;
00695 }
00696 } else {
00697 run = ((unsigned) code) >> 4;
00698 if (run == 0xF) {
00699 ZERO_RUN;
00700 } else {
00701 val = run;
00702 run = (1 << run);
00703 if (val) {
00704 UPDATE_CACHE(re, &s->gb);
00705 run += SHOW_UBITS(re, &s->gb, val);
00706 LAST_SKIP_BITS(re, &s->gb, val);
00707 }
00708 *EOBRUN = run - 1;
00709 break;
00710 }
00711 }
00712 }
00713
00714 if (i > *last_nnz)
00715 *last_nnz = i;
00716 }
00717
00718 for (; i <= last; i++) {
00719 j = s->scantable.permutated[i];
00720 if (block[j])
00721 REFINE_BIT(j)
00722 }
00723 CLOSE_READER(re, &s->gb);
00724
00725 return 0;
00726 }
00727 #undef REFINE_BIT
00728 #undef ZERO_RUN
00729
00730 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
00731 {
00732 int i, mb_x, mb_y;
00733 uint16_t (*buffer)[4];
00734 int left[3], top[3], topleft[3];
00735 const int linesize = s->linesize[0];
00736 const int mask = (1 << s->bits) - 1;
00737 int resync_mb_y = 0;
00738 int resync_mb_x = 0;
00739
00740 s->restart_count = s->restart_interval;
00741
00742 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
00743 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
00744 buffer = s->ljpeg_buffer;
00745
00746 for (i = 0; i < 3; i++)
00747 buffer[0][i] = 1 << (s->bits - 1);
00748
00749 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00750 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
00751
00752 if (s->interlaced && s->bottom_field)
00753 ptr += linesize >> 1;
00754
00755 for (i = 0; i < 3; i++)
00756 top[i] = left[i] = topleft[i] = buffer[0][i];
00757
00758 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00759 int modified_predictor = predictor;
00760
00761 if (s->restart_interval && !s->restart_count){
00762 s->restart_count = s->restart_interval;
00763 resync_mb_x = mb_x;
00764 resync_mb_y = mb_y;
00765 for(i=0; i<3; i++)
00766 top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
00767 }
00768 if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
00769 modified_predictor = 1;
00770
00771 for (i=0;i<nb_components;i++) {
00772 int pred, dc;
00773
00774 topleft[i] = top[i];
00775 top[i] = buffer[mb_x][i];
00776
00777 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
00778
00779 dc = mjpeg_decode_dc(s, s->dc_index[i]);
00780 if(dc == 0xFFFF)
00781 return -1;
00782
00783 left[i] = buffer[mb_x][i] =
00784 mask & (pred + (dc << point_transform));
00785 }
00786
00787 if (s->restart_interval && !--s->restart_count) {
00788 align_get_bits(&s->gb);
00789 skip_bits(&s->gb, 16);
00790 }
00791 }
00792
00793 if (s->rct) {
00794 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00795 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
00796 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
00797 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
00798 }
00799 } else if (s->pegasus_rct) {
00800 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00801 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
00802 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
00803 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
00804 }
00805 } else {
00806 for(i=0; i<nb_components; i++) {
00807 int c= s->comp_index[i];
00808 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
00809 ptr[3*mb_x+2-c] = buffer[mb_x][i];
00810 }
00811 }
00812 }
00813 }
00814 return 0;
00815 }
00816
00817 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
00818 int point_transform)
00819 {
00820 int i, mb_x, mb_y;
00821 const int nb_components=s->nb_components;
00822 int bits= (s->bits+7)&~7;
00823 int resync_mb_y = 0;
00824 int resync_mb_x = 0;
00825
00826 point_transform += bits - s->bits;
00827
00828 av_assert0(nb_components==1 || nb_components==3);
00829
00830 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
00831 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
00832 if (s->restart_interval && !s->restart_count){
00833 s->restart_count = s->restart_interval;
00834 resync_mb_x = mb_x;
00835 resync_mb_y = mb_y;
00836 }
00837
00838 if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
00839 int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
00840 int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
00841 for (i = 0; i < nb_components; i++) {
00842 uint8_t *ptr;
00843 uint16_t *ptr16;
00844 int n, h, v, x, y, c, j, linesize;
00845 n = s->nb_blocks[i];
00846 c = s->comp_index[i];
00847 h = s->h_scount[i];
00848 v = s->v_scount[i];
00849 x = 0;
00850 y = 0;
00851 linesize= s->linesize[c];
00852
00853 if(bits>8) linesize /= 2;
00854
00855 for(j=0; j<n; j++) {
00856 int pred, dc;
00857
00858 dc = mjpeg_decode_dc(s, s->dc_index[i]);
00859 if(dc == 0xFFFF)
00860 return -1;
00861 if(bits<=8){
00862 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x);
00863 if(y==0 && toprow){
00864 if(x==0 && leftcol){
00865 pred= 1 << (bits - 1);
00866 }else{
00867 pred= ptr[-1];
00868 }
00869 }else{
00870 if(x==0 && leftcol){
00871 pred= ptr[-linesize];
00872 }else{
00873 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
00874 }
00875 }
00876
00877 if (s->interlaced && s->bottom_field)
00878 ptr += linesize >> 1;
00879 pred &= (-1)<<(8-s->bits);
00880 *ptr= pred + (dc << point_transform);
00881 }else{
00882 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x));
00883 if(y==0 && toprow){
00884 if(x==0 && leftcol){
00885 pred= 1 << (bits - 1);
00886 }else{
00887 pred= ptr16[-1];
00888 }
00889 }else{
00890 if(x==0 && leftcol){
00891 pred= ptr16[-linesize];
00892 }else{
00893 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
00894 }
00895 }
00896
00897 if (s->interlaced && s->bottom_field)
00898 ptr16 += linesize >> 1;
00899 pred &= (-1)<<(16-s->bits);
00900 *ptr16= pred + (dc << point_transform);
00901 }
00902 if (++x == h) {
00903 x = 0;
00904 y++;
00905 }
00906 }
00907 }
00908 } else {
00909 for (i = 0; i < nb_components; i++) {
00910 uint8_t *ptr;
00911 uint16_t *ptr16;
00912 int n, h, v, x, y, c, j, linesize, dc;
00913 n = s->nb_blocks[i];
00914 c = s->comp_index[i];
00915 h = s->h_scount[i];
00916 v = s->v_scount[i];
00917 x = 0;
00918 y = 0;
00919 linesize = s->linesize[c];
00920
00921 if(bits>8) linesize /= 2;
00922
00923 for (j = 0; j < n; j++) {
00924 int pred;
00925
00926 dc = mjpeg_decode_dc(s, s->dc_index[i]);
00927 if(dc == 0xFFFF)
00928 return -1;
00929 if(bits<=8){
00930 ptr = s->picture.data[c] +
00931 (linesize * (v * mb_y + y)) +
00932 (h * mb_x + x);
00933 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
00934
00935 pred &= (-1)<<(8-s->bits);
00936 *ptr = pred + (dc << point_transform);
00937 }else{
00938 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x));
00939 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
00940
00941 pred &= (-1)<<(16-s->bits);
00942 *ptr16= pred + (dc << point_transform);
00943 }
00944
00945 if (++x == h) {
00946 x = 0;
00947 y++;
00948 }
00949 }
00950 }
00951 }
00952 if (s->restart_interval && !--s->restart_count) {
00953 align_get_bits(&s->gb);
00954 skip_bits(&s->gb, 16);
00955 }
00956 }
00957 }
00958 return 0;
00959 }
00960
00961 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
00962 int linesize, int lowres)
00963 {
00964 switch (lowres) {
00965 case 0: copy_block8(dst, src, linesize, linesize, 8);
00966 break;
00967 case 1: copy_block4(dst, src, linesize, linesize, 4);
00968 break;
00969 case 2: copy_block2(dst, src, linesize, linesize, 2);
00970 break;
00971 case 3: *dst = *src;
00972 break;
00973 }
00974 }
00975
00976 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
00977 int Al, const uint8_t *mb_bitmask,
00978 const AVFrame *reference)
00979 {
00980 int i, mb_x, mb_y;
00981 uint8_t *data[MAX_COMPONENTS];
00982 const uint8_t *reference_data[MAX_COMPONENTS];
00983 int linesize[MAX_COMPONENTS];
00984 GetBitContext mb_bitmask_gb;
00985
00986 if (mb_bitmask)
00987 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
00988
00989 if (s->flipped && s->avctx->lowres) {
00990 av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
00991 s->flipped = 0;
00992 }
00993
00994 for (i = 0; i < nb_components; i++) {
00995 int c = s->comp_index[i];
00996 data[c] = s->picture_ptr->data[c];
00997 reference_data[c] = reference ? reference->data[c] : NULL;
00998 linesize[c] = s->linesize[c];
00999 s->coefs_finished[c] |= 1;
01000 if (s->flipped && !(s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
01001
01002 int offset = (linesize[c] * (s->v_scount[i] *
01003 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
01004 data[c] += offset;
01005 reference_data[c] += offset;
01006 linesize[c] *= -1;
01007 }
01008 }
01009
01010 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
01011 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
01012 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
01013
01014 if (s->restart_interval && !s->restart_count)
01015 s->restart_count = s->restart_interval;
01016
01017 if (get_bits_left(&s->gb) < 0) {
01018 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
01019 -get_bits_left(&s->gb));
01020 return AVERROR_INVALIDDATA;
01021 }
01022 for (i = 0; i < nb_components; i++) {
01023 uint8_t *ptr;
01024 int n, h, v, x, y, c, j;
01025 int block_offset;
01026 n = s->nb_blocks[i];
01027 c = s->comp_index[i];
01028 h = s->h_scount[i];
01029 v = s->v_scount[i];
01030 x = 0;
01031 y = 0;
01032 for (j = 0; j < n; j++) {
01033 block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
01034 (h * mb_x + x) * 8) >> s->avctx->lowres);
01035
01036 if (s->interlaced && s->bottom_field)
01037 block_offset += linesize[c] >> 1;
01038 ptr = data[c] + block_offset;
01039 if (!s->progressive) {
01040 if (copy_mb)
01041 mjpeg_copy_block(ptr, reference_data[c] + block_offset,
01042 linesize[c], s->avctx->lowres);
01043 else {
01044 s->dsp.clear_block(s->block);
01045 if (decode_block(s, s->block, i,
01046 s->dc_index[i], s->ac_index[i],
01047 s->quant_matrixes[s->quant_index[c]]) < 0) {
01048 av_log(s->avctx, AV_LOG_ERROR,
01049 "error y=%d x=%d\n", mb_y, mb_x);
01050 return AVERROR_INVALIDDATA;
01051 }
01052 s->dsp.idct_put(ptr, linesize[c], s->block);
01053 }
01054 } else {
01055 int block_idx = s->block_stride[c] * (v * mb_y + y) +
01056 (h * mb_x + x);
01057 DCTELEM *block = s->blocks[c][block_idx];
01058 if (Ah)
01059 block[0] += get_bits1(&s->gb) *
01060 s->quant_matrixes[s->quant_index[c]][0] << Al;
01061 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
01062 s->quant_matrixes[s->quant_index[c]],
01063 Al) < 0) {
01064 av_log(s->avctx, AV_LOG_ERROR,
01065 "error y=%d x=%d\n", mb_y, mb_x);
01066 return AVERROR_INVALIDDATA;
01067 }
01068 }
01069 av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
01070 av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
01071 mb_x, mb_y, x, y, c, s->bottom_field,
01072 (v * mb_y + y) * 8, (h * mb_x + x) * 8);
01073 if (++x == h) {
01074 x = 0;
01075 y++;
01076 }
01077 }
01078 }
01079
01080 if (s->restart_interval) {
01081 s->restart_count--;
01082 if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
01083 align_get_bits(&s->gb);
01084 for (i = 0; i < nb_components; i++)
01085 s->last_dc[i] = 1024;
01086 }
01087
01088 i = 8 + ((-get_bits_count(&s->gb)) & 7);
01089
01090 if (show_bits(&s->gb, i) == (1 << i) - 1) {
01091 int pos = get_bits_count(&s->gb);
01092 align_get_bits(&s->gb);
01093 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
01094 skip_bits(&s->gb, 8);
01095 if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
01096 for (i = 0; i < nb_components; i++)
01097 s->last_dc[i] = 1024;
01098 } else
01099 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
01100 }
01101 }
01102 }
01103 }
01104 return 0;
01105 }
01106
01107 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
01108 int se, int Ah, int Al)
01109 {
01110 int mb_x, mb_y;
01111 int EOBRUN = 0;
01112 int c = s->comp_index[0];
01113 uint8_t *data = s->picture.data[c];
01114 int linesize = s->linesize[c];
01115 int last_scan = 0;
01116 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
01117
01118 if (se > 63) {
01119 av_log(s->avctx, AV_LOG_ERROR, "SE %d is too large\n", se);
01120 return AVERROR_INVALIDDATA;
01121 }
01122
01123 if (!Al) {
01124 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
01125 last_scan = !~s->coefs_finished[c];
01126 }
01127
01128 if (s->interlaced && s->bottom_field)
01129 data += linesize >> 1;
01130
01131 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
01132 uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
01133 int block_idx = mb_y * s->block_stride[c];
01134 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
01135 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
01136 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
01137 int ret;
01138 if (Ah)
01139 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
01140 quant_matrix, ss, se, Al, &EOBRUN);
01141 else
01142 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
01143 quant_matrix, ss, se, Al, &EOBRUN);
01144 if (ret < 0) {
01145 av_log(s->avctx, AV_LOG_ERROR,
01146 "error y=%d x=%d\n", mb_y, mb_x);
01147 return AVERROR_INVALIDDATA;
01148 }
01149
01150 if (last_scan) {
01151 s->dsp.idct_put(ptr, linesize, *block);
01152 ptr += 8 >> s->avctx->lowres;
01153 }
01154 }
01155 }
01156 return 0;
01157 }
01158
01159 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
01160 const AVFrame *reference)
01161 {
01162 int len, nb_components, i, h, v, predictor, point_transform;
01163 int index, id, ret;
01164 const int block_size = s->lossless ? 1 : 8;
01165 int ilv, prev_shift;
01166
01167 if (!s->got_picture) {
01168 av_log(s->avctx, AV_LOG_WARNING,
01169 "Can not process SOS before SOF, skipping\n");
01170 return -1;
01171 }
01172
01173 av_assert0(s->picture_ptr->data[0]);
01174
01175 len = get_bits(&s->gb, 16);
01176 nb_components = get_bits(&s->gb, 8);
01177 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
01178 av_log(s->avctx, AV_LOG_ERROR,
01179 "decode_sos: nb_components (%d) unsupported\n", nb_components);
01180 return AVERROR_PATCHWELCOME;
01181 }
01182 if (len != 6 + 2 * nb_components) {
01183 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
01184 return AVERROR_INVALIDDATA;
01185 }
01186 for (i = 0; i < nb_components; i++) {
01187 id = get_bits(&s->gb, 8) - 1;
01188 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
01189
01190 for (index = 0; index < s->nb_components; index++)
01191 if (id == s->component_id[index])
01192 break;
01193 if (index == s->nb_components) {
01194 av_log(s->avctx, AV_LOG_ERROR,
01195 "decode_sos: index(%d) out of components\n", index);
01196 return AVERROR_INVALIDDATA;
01197 }
01198
01199 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
01200 && nb_components == 3 && s->nb_components == 3 && i)
01201 index = 3 - i;
01202
01203 if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
01204 index = (i+2)%3;
01205 if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
01206 index = (index+2)%3;
01207
01208 s->comp_index[i] = index;
01209
01210 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
01211 s->h_scount[i] = s->h_count[index];
01212 s->v_scount[i] = s->v_count[index];
01213
01214 s->dc_index[i] = get_bits(&s->gb, 4);
01215 s->ac_index[i] = get_bits(&s->gb, 4);
01216
01217 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
01218 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
01219 goto out_of_range;
01220 if (!s->vlcs[0][s->dc_index[i]].table || !(s->progressive ? s->vlcs[2][s->ac_index[0]].table : s->vlcs[1][s->ac_index[i]].table))
01221 goto out_of_range;
01222 }
01223
01224 predictor = get_bits(&s->gb, 8);
01225 ilv = get_bits(&s->gb, 8);
01226 if(s->avctx->codec_tag != AV_RL32("CJPG")){
01227 prev_shift = get_bits(&s->gb, 4);
01228 point_transform = get_bits(&s->gb, 4);
01229 }else
01230 prev_shift = point_transform = 0;
01231
01232 if (nb_components > 1) {
01233
01234 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
01235 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
01236 } else if (!s->ls) {
01237 h = s->h_max / s->h_scount[0];
01238 v = s->v_max / s->v_scount[0];
01239 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
01240 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
01241 s->nb_blocks[0] = 1;
01242 s->h_scount[0] = 1;
01243 s->v_scount[0] = 1;
01244 }
01245
01246 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01247 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
01248 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
01249 predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
01250 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
01251
01252
01253
01254 for (i = s->mjpb_skiptosod; i > 0; i--)
01255 skip_bits(&s->gb, 8);
01256
01257 next_field:
01258 for (i = 0; i < nb_components; i++)
01259 s->last_dc[i] = 1024;
01260
01261 if (s->lossless) {
01262 av_assert0(s->picture_ptr == &s->picture);
01263 if (CONFIG_JPEGLS_DECODER && s->ls) {
01264
01265
01266
01267 if ((ret = ff_jpegls_decode_picture(s, predictor,
01268 point_transform, ilv)) < 0)
01269 return ret;
01270 } else {
01271 if (s->rgb) {
01272 if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
01273 return ret;
01274 } else {
01275 if ((ret = ljpeg_decode_yuv_scan(s, predictor, point_transform)) < 0)
01276 return ret;
01277 }
01278 }
01279 } else {
01280 if (s->progressive && predictor) {
01281 av_assert0(s->picture_ptr == &s->picture);
01282 if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
01283 ilv, prev_shift,
01284 point_transform)) < 0)
01285 return ret;
01286 } else {
01287 if ((ret = mjpeg_decode_scan(s, nb_components,
01288 prev_shift, point_transform,
01289 mb_bitmask, reference)) < 0)
01290 return ret;
01291 }
01292 }
01293
01294 if (s->interlaced &&
01295 get_bits_left(&s->gb) > 32 &&
01296 show_bits(&s->gb, 8) == 0xFF) {
01297 GetBitContext bak = s->gb;
01298 align_get_bits(&bak);
01299 if (show_bits(&bak, 16) == 0xFFD1) {
01300 av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
01301 s->gb = bak;
01302 skip_bits(&s->gb, 16);
01303 s->bottom_field ^= 1;
01304
01305 goto next_field;
01306 }
01307 }
01308
01309 emms_c();
01310 return 0;
01311 out_of_range:
01312 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
01313 return AVERROR_INVALIDDATA;
01314 }
01315
01316 static int mjpeg_decode_dri(MJpegDecodeContext *s)
01317 {
01318 if (get_bits(&s->gb, 16) != 4)
01319 return AVERROR_INVALIDDATA;
01320 s->restart_interval = get_bits(&s->gb, 16);
01321 s->restart_count = 0;
01322 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
01323 s->restart_interval);
01324
01325 return 0;
01326 }
01327
01328 static int mjpeg_decode_app(MJpegDecodeContext *s)
01329 {
01330 int len, id, i;
01331
01332 len = get_bits(&s->gb, 16);
01333 if (len < 5)
01334 return AVERROR_INVALIDDATA;
01335 if (8 * len > get_bits_left(&s->gb))
01336 return AVERROR_INVALIDDATA;
01337
01338 id = get_bits_long(&s->gb, 32);
01339 id = av_be2ne32(id);
01340 len -= 6;
01341
01342 if (s->avctx->debug & FF_DEBUG_STARTCODE)
01343 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
01344
01345
01346
01347
01348 if (id == AV_RL32("AVI1")) {
01349
01350
01351
01352
01353
01354
01355
01356 s->buggy_avid = 1;
01357 i = get_bits(&s->gb, 8); len--;
01358 av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
01359 #if 0
01360 skip_bits(&s->gb, 8);
01361 skip_bits(&s->gb, 32);
01362 skip_bits(&s->gb, 32);
01363 len -= 10;
01364 #endif
01365 goto out;
01366 }
01367
01368
01369
01370 if (id == AV_RL32("JFIF")) {
01371 int t_w, t_h, v1, v2;
01372 skip_bits(&s->gb, 8);
01373 v1 = get_bits(&s->gb, 8);
01374 v2 = get_bits(&s->gb, 8);
01375 skip_bits(&s->gb, 8);
01376
01377 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
01378 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
01379
01380 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01381 av_log(s->avctx, AV_LOG_INFO,
01382 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
01383 v1, v2,
01384 s->avctx->sample_aspect_ratio.num,
01385 s->avctx->sample_aspect_ratio.den);
01386
01387 t_w = get_bits(&s->gb, 8);
01388 t_h = get_bits(&s->gb, 8);
01389 if (t_w && t_h) {
01390
01391 if (len -10 - (t_w * t_h * 3) > 0)
01392 len -= t_w * t_h * 3;
01393 }
01394 len -= 10;
01395 goto out;
01396 }
01397
01398 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
01399 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01400 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
01401 skip_bits(&s->gb, 16);
01402 skip_bits(&s->gb, 16);
01403 skip_bits(&s->gb, 16);
01404 skip_bits(&s->gb, 8);
01405 len -= 7;
01406 goto out;
01407 }
01408
01409 if (id == AV_RL32("LJIF")) {
01410 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01411 av_log(s->avctx, AV_LOG_INFO,
01412 "Pegasus lossless jpeg header found\n");
01413 skip_bits(&s->gb, 16);
01414 skip_bits(&s->gb, 16);
01415 skip_bits(&s->gb, 16);
01416 skip_bits(&s->gb, 16);
01417 switch (get_bits(&s->gb, 8)) {
01418 case 1:
01419 s->rgb = 1;
01420 s->pegasus_rct = 0;
01421 break;
01422 case 2:
01423 s->rgb = 1;
01424 s->pegasus_rct = 1;
01425 break;
01426 default:
01427 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
01428 }
01429 len -= 9;
01430 goto out;
01431 }
01432
01433
01434 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
01435 id = get_bits_long(&s->gb, 32);
01436 id = av_be2ne32(id);
01437 len -= 4;
01438
01439 if (id == AV_RL32("mjpg")) {
01440 #if 0
01441 skip_bits(&s->gb, 32);
01442 skip_bits(&s->gb, 32);
01443 skip_bits(&s->gb, 32);
01444 skip_bits(&s->gb, 32);
01445 skip_bits(&s->gb, 32);
01446 skip_bits(&s->gb, 32);
01447 skip_bits(&s->gb, 32);
01448 skip_bits(&s->gb, 32);
01449 #endif
01450 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01451 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
01452 }
01453 }
01454
01455 out:
01456
01457 if (len < 0)
01458 av_log(s->avctx, AV_LOG_ERROR,
01459 "mjpeg: error, decode_app parser read over the end\n");
01460 while (--len > 0)
01461 skip_bits(&s->gb, 8);
01462
01463 return 0;
01464 }
01465
01466 static int mjpeg_decode_com(MJpegDecodeContext *s)
01467 {
01468 int len = get_bits(&s->gb, 16);
01469 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
01470 char *cbuf = av_malloc(len - 1);
01471 if (cbuf) {
01472 int i;
01473 for (i = 0; i < len - 2; i++)
01474 cbuf[i] = get_bits(&s->gb, 8);
01475 if (i > 0 && cbuf[i - 1] == '\n')
01476 cbuf[i - 1] = 0;
01477 else
01478 cbuf[i] = 0;
01479
01480 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
01481 av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
01482
01483
01484 if (!strcmp(cbuf, "AVID")) {
01485 s->buggy_avid = 1;
01486 } else if (!strcmp(cbuf, "CS=ITU601"))
01487 s->cs_itu601 = 1;
01488 else if ((len > 31 && !strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32)) ||
01489 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
01490 s->flipped = 1;
01491
01492 av_free(cbuf);
01493 }
01494 }
01495
01496 return 0;
01497 }
01498
01499
01500
01501 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
01502 {
01503 const uint8_t *buf_ptr;
01504 unsigned int v, v2;
01505 int val;
01506 int skipped = 0;
01507
01508 buf_ptr = *pbuf_ptr;
01509 while (buf_ptr < buf_end) {
01510 v = *buf_ptr++;
01511 v2 = *buf_ptr;
01512 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
01513 val = *buf_ptr++;
01514 goto found;
01515 }
01516 skipped++;
01517 }
01518 val = -1;
01519 found:
01520 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
01521 *pbuf_ptr = buf_ptr;
01522 return val;
01523 }
01524
01525 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
01526 const uint8_t **buf_ptr, const uint8_t *buf_end,
01527 const uint8_t **unescaped_buf_ptr,
01528 int *unescaped_buf_size)
01529 {
01530 int start_code;
01531 start_code = find_marker(buf_ptr, buf_end);
01532
01533 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
01534 if (!s->buffer)
01535 return AVERROR(ENOMEM);
01536
01537
01538 if (start_code == SOS && !s->ls) {
01539 const uint8_t *src = *buf_ptr;
01540 uint8_t *dst = s->buffer;
01541
01542 while (src < buf_end) {
01543 uint8_t x = *(src++);
01544
01545 *(dst++) = x;
01546 if (s->avctx->codec_id != AV_CODEC_ID_THP) {
01547 if (x == 0xff) {
01548 while (src < buf_end && x == 0xff)
01549 x = *(src++);
01550
01551 if (x >= 0xd0 && x <= 0xd7)
01552 *(dst++) = x;
01553 else if (x)
01554 break;
01555 }
01556 }
01557 }
01558 *unescaped_buf_ptr = s->buffer;
01559 *unescaped_buf_size = dst - s->buffer;
01560 memset(s->buffer + *unescaped_buf_size, 0,
01561 FF_INPUT_BUFFER_PADDING_SIZE);
01562
01563 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
01564 (buf_end - *buf_ptr) - (dst - s->buffer));
01565 } else if (start_code == SOS && s->ls) {
01566 const uint8_t *src = *buf_ptr;
01567 uint8_t *dst = s->buffer;
01568 int bit_count = 0;
01569 int t = 0, b = 0;
01570 PutBitContext pb;
01571
01572 s->cur_scan++;
01573
01574
01575 while (src + t < buf_end) {
01576 uint8_t x = src[t++];
01577 if (x == 0xff) {
01578 while ((src + t < buf_end) && x == 0xff)
01579 x = src[t++];
01580 if (x & 0x80) {
01581 t -= 2;
01582 break;
01583 }
01584 }
01585 }
01586 bit_count = t * 8;
01587 init_put_bits(&pb, dst, t);
01588
01589
01590 while (b < t) {
01591 uint8_t x = src[b++];
01592 put_bits(&pb, 8, x);
01593 if (x == 0xFF) {
01594 x = src[b++];
01595 put_bits(&pb, 7, x);
01596 bit_count--;
01597 }
01598 }
01599 flush_put_bits(&pb);
01600
01601 *unescaped_buf_ptr = dst;
01602 *unescaped_buf_size = (bit_count + 7) >> 3;
01603 memset(s->buffer + *unescaped_buf_size, 0,
01604 FF_INPUT_BUFFER_PADDING_SIZE);
01605 } else {
01606 *unescaped_buf_ptr = *buf_ptr;
01607 *unescaped_buf_size = buf_end - *buf_ptr;
01608 }
01609
01610 return start_code;
01611 }
01612
01613 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
01614 AVPacket *avpkt)
01615 {
01616 const uint8_t *buf = avpkt->data;
01617 int buf_size = avpkt->size;
01618 MJpegDecodeContext *s = avctx->priv_data;
01619 const uint8_t *buf_end, *buf_ptr;
01620 const uint8_t *unescaped_buf_ptr;
01621 int unescaped_buf_size;
01622 int start_code;
01623 int i, index;
01624 int ret = 0;
01625 AVFrame *picture = data;
01626
01627 buf_ptr = buf;
01628 buf_end = buf + buf_size;
01629 while (buf_ptr < buf_end) {
01630
01631 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
01632 &unescaped_buf_ptr,
01633 &unescaped_buf_size);
01634
01635 if (start_code < 0) {
01636 goto the_end;
01637 } else if (unescaped_buf_size > (1U<<28)) {
01638 av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
01639 start_code, unescaped_buf_size, buf_size);
01640 return AVERROR_INVALIDDATA;
01641 } else {
01642 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
01643 start_code, buf_end - buf_ptr);
01644
01645 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
01646
01647 s->start_code = start_code;
01648 if (s->avctx->debug & FF_DEBUG_STARTCODE)
01649 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
01650
01651
01652 if (start_code >= 0xd0 && start_code <= 0xd7)
01653 av_log(avctx, AV_LOG_DEBUG,
01654 "restart marker: %d\n", start_code & 0x0f);
01655
01656 else if (start_code >= APP0 && start_code <= APP15)
01657 mjpeg_decode_app(s);
01658
01659 else if (start_code == COM)
01660 mjpeg_decode_com(s);
01661
01662 ret = -1;
01663 switch (start_code) {
01664 case SOI:
01665 s->restart_interval = 0;
01666 s->restart_count = 0;
01667
01668 break;
01669 case DQT:
01670 ff_mjpeg_decode_dqt(s);
01671 break;
01672 case DHT:
01673 if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
01674 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
01675 goto fail;
01676 }
01677 break;
01678 case SOF0:
01679 case SOF1:
01680 s->lossless = 0;
01681 s->ls = 0;
01682 s->progressive = 0;
01683 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
01684 goto fail;
01685 break;
01686 case SOF2:
01687 s->lossless = 0;
01688 s->ls = 0;
01689 s->progressive = 1;
01690 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
01691 goto fail;
01692 break;
01693 case SOF3:
01694 s->lossless = 1;
01695 s->ls = 0;
01696 s->progressive = 0;
01697 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
01698 goto fail;
01699 break;
01700 case SOF48:
01701 s->lossless = 1;
01702 s->ls = 1;
01703 s->progressive = 0;
01704 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
01705 goto fail;
01706 break;
01707 case LSE:
01708 if (!CONFIG_JPEGLS_DECODER ||
01709 (ret = ff_jpegls_decode_lse(s)) < 0)
01710 goto fail;
01711 break;
01712 case EOI:
01713 eoi_parser:
01714 s->cur_scan = 0;
01715 if (!s->got_picture) {
01716 av_log(avctx, AV_LOG_WARNING,
01717 "Found EOI before any SOF, ignoring\n");
01718 break;
01719 }
01720 if (s->interlaced) {
01721 s->bottom_field ^= 1;
01722
01723 if (s->bottom_field == !s->interlace_polarity)
01724 break;
01725 }
01726 *picture = *s->picture_ptr;
01727 *got_frame = 1;
01728 s->got_picture = 0;
01729
01730 if (!s->lossless) {
01731 picture->quality = FFMAX3(s->qscale[0],
01732 s->qscale[1],
01733 s->qscale[2]);
01734 picture->qstride = 0;
01735 picture->qscale_table = s->qscale_table;
01736 memset(picture->qscale_table, picture->quality,
01737 (s->width + 15) / 16);
01738 if (avctx->debug & FF_DEBUG_QP)
01739 av_log(avctx, AV_LOG_DEBUG,
01740 "QP: %d\n", picture->quality);
01741 picture->quality *= FF_QP2LAMBDA;
01742 }
01743
01744 goto the_end;
01745 case SOS:
01746 if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
01747 (avctx->err_recognition & AV_EF_EXPLODE))
01748 goto fail;
01749 break;
01750 case DRI:
01751 mjpeg_decode_dri(s);
01752 break;
01753 case SOF5:
01754 case SOF6:
01755 case SOF7:
01756 case SOF9:
01757 case SOF10:
01758 case SOF11:
01759 case SOF13:
01760 case SOF14:
01761 case SOF15:
01762 case JPG:
01763 av_log(avctx, AV_LOG_ERROR,
01764 "mjpeg: unsupported coding type (%x)\n", start_code);
01765 break;
01766 }
01767
01768
01769 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
01770 av_log(avctx, AV_LOG_DEBUG,
01771 "marker parser used %d bytes (%d bits)\n",
01772 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
01773 }
01774 }
01775 if (s->got_picture) {
01776 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
01777 goto eoi_parser;
01778 }
01779 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
01780 return AVERROR_INVALIDDATA;
01781 fail:
01782 s->got_picture = 0;
01783 return ret;
01784 the_end:
01785 if (s->upscale_h) {
01786 uint8_t *line = s->picture_ptr->data[s->upscale_h];
01787 av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
01788 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
01789 avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
01790 avctx->pix_fmt == AV_PIX_FMT_YUV440P);
01791 for (i = 0; i < s->chroma_height; i++) {
01792 for (index = s->width - 1; index; index--)
01793 line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
01794 line += s->linesize[s->upscale_h];
01795 }
01796 }
01797 if (s->upscale_v) {
01798 uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
01799 av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
01800 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
01801 avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
01802 avctx->pix_fmt == AV_PIX_FMT_YUV422P);
01803 for (i = s->height - 1; i; i--) {
01804 uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
01805 uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
01806 if (src1 == src2) {
01807 memcpy(dst, src1, s->width);
01808 } else {
01809 for (index = 0; index < s->width; index++)
01810 dst[index] = (src1[index] + src2[index]) >> 1;
01811 }
01812 dst -= s->linesize[s->upscale_v];
01813 }
01814 }
01815 if (s->flipped && (s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
01816 int hshift, vshift, j;
01817 avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
01818 for (index=0; index<4; index++) {
01819 uint8_t *dst = s->picture_ptr->data[index];
01820 int w = s->width;
01821 int h = s->height;
01822 if(index && index<3){
01823 w = -((-w) >> hshift);
01824 h = -((-h) >> vshift);
01825 }
01826 if(dst){
01827 uint8_t *dst2 = dst + s->linesize[index]*(h-1);
01828 for (i=0; i<h/2; i++) {
01829 for (j=0; j<w; j++)
01830 FFSWAP(int, dst[j], dst2[j]);
01831 dst += s->linesize[index];
01832 dst2 -= s->linesize[index];
01833 }
01834 }
01835 }
01836 }
01837
01838 av_log(avctx, AV_LOG_DEBUG, "decode frame unused %td bytes\n",
01839 buf_end - buf_ptr);
01840
01841 return buf_ptr - buf;
01842 }
01843
01844 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
01845 {
01846 MJpegDecodeContext *s = avctx->priv_data;
01847 int i, j;
01848
01849 if (s->picture_ptr && s->picture_ptr->data[0])
01850 avctx->release_buffer(avctx, s->picture_ptr);
01851
01852 av_free(s->buffer);
01853 av_free(s->qscale_table);
01854 av_freep(&s->ljpeg_buffer);
01855 s->ljpeg_buffer_size = 0;
01856
01857 for (i = 0; i < 3; i++) {
01858 for (j = 0; j < 4; j++)
01859 ff_free_vlc(&s->vlcs[i][j]);
01860 }
01861 for (i = 0; i < MAX_COMPONENTS; i++) {
01862 av_freep(&s->blocks[i]);
01863 av_freep(&s->last_nnz[i]);
01864 }
01865 return 0;
01866 }
01867
01868 static void decode_flush(AVCodecContext *avctx)
01869 {
01870 MJpegDecodeContext *s = avctx->priv_data;
01871 s->got_picture = 0;
01872 }
01873
01874 #if CONFIG_MJPEG_DECODER
01875 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
01876 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
01877 static const AVOption options[] = {
01878 { "extern_huff", "Use external huffman table.",
01879 OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
01880 { NULL },
01881 };
01882
01883 static const AVClass mjpegdec_class = {
01884 .class_name = "MJPEG decoder",
01885 .item_name = av_default_item_name,
01886 .option = options,
01887 .version = LIBAVUTIL_VERSION_INT,
01888 };
01889
01890 AVCodec ff_mjpeg_decoder = {
01891 .name = "mjpeg",
01892 .type = AVMEDIA_TYPE_VIDEO,
01893 .id = AV_CODEC_ID_MJPEG,
01894 .priv_data_size = sizeof(MJpegDecodeContext),
01895 .init = ff_mjpeg_decode_init,
01896 .close = ff_mjpeg_decode_end,
01897 .decode = ff_mjpeg_decode_frame,
01898 .flush = decode_flush,
01899 .capabilities = CODEC_CAP_DR1,
01900 .max_lowres = 3,
01901 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
01902 .priv_class = &mjpegdec_class,
01903 };
01904 #endif
01905 #if CONFIG_THP_DECODER
01906 AVCodec ff_thp_decoder = {
01907 .name = "thp",
01908 .type = AVMEDIA_TYPE_VIDEO,
01909 .id = AV_CODEC_ID_THP,
01910 .priv_data_size = sizeof(MJpegDecodeContext),
01911 .init = ff_mjpeg_decode_init,
01912 .close = ff_mjpeg_decode_end,
01913 .decode = ff_mjpeg_decode_frame,
01914 .flush = decode_flush,
01915 .capabilities = CODEC_CAP_DR1,
01916 .max_lowres = 3,
01917 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
01918 };
01919 #endif