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00023 #include "libavutil/avstring.h"
00024 #include "libavutil/avassert.h"
00025 #include "libavutil/bswap.h"
00026 #include "libavutil/dict.h"
00027 #include "libavutil/mathematics.h"
00028 #include "libavutil/tree.h"
00029 #include "avio_internal.h"
00030 #include "nut.h"
00031 #include "riff.h"
00032
00033 #define NUT_MAX_STREAMS 256
00034
00035 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
00036 int64_t *pos_arg, int64_t pos_limit);
00037
00038 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
00039 {
00040 unsigned int len = ffio_read_varlen(bc);
00041
00042 if (len && maxlen)
00043 avio_read(bc, string, FFMIN(len, maxlen));
00044 while (len > maxlen) {
00045 avio_r8(bc);
00046 len--;
00047 }
00048
00049 if (maxlen)
00050 string[FFMIN(len, maxlen - 1)] = 0;
00051
00052 if (maxlen == len)
00053 return -1;
00054 else
00055 return 0;
00056 }
00057
00058 static int64_t get_s(AVIOContext *bc)
00059 {
00060 int64_t v = ffio_read_varlen(bc) + 1;
00061
00062 if (v & 1)
00063 return -(v >> 1);
00064 else
00065 return (v >> 1);
00066 }
00067
00068 static uint64_t get_fourcc(AVIOContext *bc)
00069 {
00070 unsigned int len = ffio_read_varlen(bc);
00071
00072 if (len == 2)
00073 return avio_rl16(bc);
00074 else if (len == 4)
00075 return avio_rl32(bc);
00076 else
00077 return -1;
00078 }
00079
00080 #ifdef TRACE
00081 static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
00082 const char *func, int line)
00083 {
00084 uint64_t v = ffio_read_varlen(bc);
00085
00086 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
00087 v, v, file, func, line);
00088 return v;
00089 }
00090
00091 static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
00092 const char *func, int line)
00093 {
00094 int64_t v = get_s(bc);
00095
00096 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
00097 v, v, file, func, line);
00098 return v;
00099 }
00100
00101 static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file,
00102 char *func, int line)
00103 {
00104 uint64_t v = get_fourcc(bc);
00105
00106 av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n",
00107 v, v, file, func, line);
00108 return v;
00109 }
00110 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00111 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00112 #define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
00113 #endif
00114
00115 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
00116 int calculate_checksum, uint64_t startcode)
00117 {
00118 int64_t size;
00119
00120
00121 startcode = av_be2ne64(startcode);
00122 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
00123
00124 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
00125 size = ffio_read_varlen(bc);
00126 if (size > 4096)
00127 avio_rb32(bc);
00128 if (ffio_get_checksum(bc) && size > 4096)
00129 return -1;
00130
00131 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
00132
00133 return size;
00134 }
00135
00136 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
00137 {
00138 uint64_t state = 0;
00139
00140 if (pos >= 0)
00141
00142
00143 avio_seek(bc, pos, SEEK_SET);
00144 while (!url_feof(bc)) {
00145 state = (state << 8) | avio_r8(bc);
00146 if ((state >> 56) != 'N')
00147 continue;
00148 switch (state) {
00149 case MAIN_STARTCODE:
00150 case STREAM_STARTCODE:
00151 case SYNCPOINT_STARTCODE:
00152 case INFO_STARTCODE:
00153 case INDEX_STARTCODE:
00154 return state;
00155 }
00156 }
00157
00158 return 0;
00159 }
00160
00167 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
00168 {
00169 for (;;) {
00170 uint64_t startcode = find_any_startcode(bc, pos);
00171 if (startcode == code)
00172 return avio_tell(bc) - 8;
00173 else if (startcode == 0)
00174 return -1;
00175 pos = -1;
00176 }
00177 }
00178
00179 static int nut_probe(AVProbeData *p)
00180 {
00181 int i;
00182 uint64_t code = 0;
00183
00184 for (i = 0; i < p->buf_size; i++) {
00185 code = (code << 8) | p->buf[i];
00186 if (code == MAIN_STARTCODE)
00187 return AVPROBE_SCORE_MAX;
00188 }
00189 return 0;
00190 }
00191
00192 #define GET_V(dst, check) \
00193 do { \
00194 tmp = ffio_read_varlen(bc); \
00195 if (!(check)) { \
00196 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
00197 return -1; \
00198 } \
00199 dst = tmp; \
00200 } while (0)
00201
00202 static int skip_reserved(AVIOContext *bc, int64_t pos)
00203 {
00204 pos -= avio_tell(bc);
00205 if (pos < 0) {
00206 avio_seek(bc, pos, SEEK_CUR);
00207 return -1;
00208 } else {
00209 while (pos--)
00210 avio_r8(bc);
00211 return 0;
00212 }
00213 }
00214
00215 static int decode_main_header(NUTContext *nut)
00216 {
00217 AVFormatContext *s = nut->avf;
00218 AVIOContext *bc = s->pb;
00219 uint64_t tmp, end;
00220 unsigned int stream_count;
00221 int i, j, count;
00222 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
00223
00224 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
00225 end += avio_tell(bc);
00226
00227 GET_V(tmp, tmp >= 2 && tmp <= 3);
00228 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
00229
00230 nut->max_distance = ffio_read_varlen(bc);
00231 if (nut->max_distance > 65536) {
00232 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
00233 nut->max_distance = 65536;
00234 }
00235
00236 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
00237 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));
00238
00239 for (i = 0; i < nut->time_base_count; i++) {
00240 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
00241 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
00242 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
00243 av_log(s, AV_LOG_ERROR, "time base invalid\n");
00244 return AVERROR_INVALIDDATA;
00245 }
00246 }
00247 tmp_pts = 0;
00248 tmp_mul = 1;
00249 tmp_stream = 0;
00250 tmp_head_idx = 0;
00251 for (i = 0; i < 256;) {
00252 int tmp_flags = ffio_read_varlen(bc);
00253 int tmp_fields = ffio_read_varlen(bc);
00254
00255 if (tmp_fields > 0)
00256 tmp_pts = get_s(bc);
00257 if (tmp_fields > 1)
00258 tmp_mul = ffio_read_varlen(bc);
00259 if (tmp_fields > 2)
00260 tmp_stream = ffio_read_varlen(bc);
00261 if (tmp_fields > 3)
00262 tmp_size = ffio_read_varlen(bc);
00263 else
00264 tmp_size = 0;
00265 if (tmp_fields > 4)
00266 tmp_res = ffio_read_varlen(bc);
00267 else
00268 tmp_res = 0;
00269 if (tmp_fields > 5)
00270 count = ffio_read_varlen(bc);
00271 else
00272 count = tmp_mul - tmp_size;
00273 if (tmp_fields > 6)
00274 get_s(bc);
00275 if (tmp_fields > 7)
00276 tmp_head_idx = ffio_read_varlen(bc);
00277
00278 while (tmp_fields-- > 8)
00279 ffio_read_varlen(bc);
00280
00281 if (count == 0 || i + count > 256) {
00282 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
00283 return AVERROR_INVALIDDATA;
00284 }
00285 if (tmp_stream >= stream_count) {
00286 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
00287 return AVERROR_INVALIDDATA;
00288 }
00289
00290 for (j = 0; j < count; j++, i++) {
00291 if (i == 'N') {
00292 nut->frame_code[i].flags = FLAG_INVALID;
00293 j--;
00294 continue;
00295 }
00296 nut->frame_code[i].flags = tmp_flags;
00297 nut->frame_code[i].pts_delta = tmp_pts;
00298 nut->frame_code[i].stream_id = tmp_stream;
00299 nut->frame_code[i].size_mul = tmp_mul;
00300 nut->frame_code[i].size_lsb = tmp_size + j;
00301 nut->frame_code[i].reserved_count = tmp_res;
00302 nut->frame_code[i].header_idx = tmp_head_idx;
00303 }
00304 }
00305 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
00306
00307 if (end > avio_tell(bc) + 4) {
00308 int rem = 1024;
00309 GET_V(nut->header_count, tmp < 128U);
00310 nut->header_count++;
00311 for (i = 1; i < nut->header_count; i++) {
00312 uint8_t *hdr;
00313 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
00314 rem -= nut->header_len[i];
00315 if (rem < 0) {
00316 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
00317 return AVERROR_INVALIDDATA;
00318 }
00319 hdr = av_malloc(nut->header_len[i]);
00320 if (!hdr)
00321 return AVERROR(ENOMEM);
00322 avio_read(bc, hdr, nut->header_len[i]);
00323 nut->header[i] = hdr;
00324 }
00325 av_assert0(nut->header_len[0] == 0);
00326 }
00327
00328 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
00329 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
00330 return AVERROR_INVALIDDATA;
00331 }
00332
00333 nut->stream = av_mallocz(sizeof(StreamContext) * stream_count);
00334 for (i = 0; i < stream_count; i++)
00335 avformat_new_stream(s, NULL);
00336
00337 return 0;
00338 }
00339
00340 static int decode_stream_header(NUTContext *nut)
00341 {
00342 AVFormatContext *s = nut->avf;
00343 AVIOContext *bc = s->pb;
00344 StreamContext *stc;
00345 int class, stream_id;
00346 uint64_t tmp, end;
00347 AVStream *st;
00348
00349 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
00350 end += avio_tell(bc);
00351
00352 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
00353 stc = &nut->stream[stream_id];
00354 st = s->streams[stream_id];
00355 if (!st)
00356 return AVERROR(ENOMEM);
00357
00358 class = ffio_read_varlen(bc);
00359 tmp = get_fourcc(bc);
00360 st->codec->codec_tag = tmp;
00361 switch (class) {
00362 case 0:
00363 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00364 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
00365 ff_nut_video_tags,
00366 ff_codec_bmp_tags,
00367 0
00368 },
00369 tmp);
00370 break;
00371 case 1:
00372 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00373 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
00374 ff_nut_audio_tags,
00375 ff_codec_wav_tags,
00376 0
00377 },
00378 tmp);
00379 break;
00380 case 2:
00381 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
00382 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
00383 break;
00384 case 3:
00385 st->codec->codec_type = AVMEDIA_TYPE_DATA;
00386 st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
00387 break;
00388 default:
00389 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
00390 return -1;
00391 }
00392 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)
00393 av_log(s, AV_LOG_ERROR,
00394 "Unknown codec tag '0x%04x' for stream number %d\n",
00395 (unsigned int) tmp, stream_id);
00396
00397 GET_V(stc->time_base_id, tmp < nut->time_base_count);
00398 GET_V(stc->msb_pts_shift, tmp < 16);
00399 stc->max_pts_distance = ffio_read_varlen(bc);
00400 GET_V(stc->decode_delay, tmp < 1000);
00401 st->codec->has_b_frames = stc->decode_delay;
00402 ffio_read_varlen(bc);
00403
00404 GET_V(st->codec->extradata_size, tmp < (1 << 30));
00405 if (st->codec->extradata_size) {
00406 st->codec->extradata = av_mallocz(st->codec->extradata_size +
00407 FF_INPUT_BUFFER_PADDING_SIZE);
00408 avio_read(bc, st->codec->extradata, st->codec->extradata_size);
00409 }
00410
00411 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00412 GET_V(st->codec->width, tmp > 0);
00413 GET_V(st->codec->height, tmp > 0);
00414 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
00415 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
00416 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
00417 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
00418 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
00419 return -1;
00420 }
00421 ffio_read_varlen(bc);
00422 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00423 GET_V(st->codec->sample_rate, tmp > 0);
00424 ffio_read_varlen(bc);
00425 GET_V(st->codec->channels, tmp > 0);
00426 }
00427 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
00428 av_log(s, AV_LOG_ERROR,
00429 "stream header %d checksum mismatch\n", stream_id);
00430 return -1;
00431 }
00432 stc->time_base = &nut->time_base[stc->time_base_id];
00433 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
00434 stc->time_base->den);
00435 return 0;
00436 }
00437
00438 static void set_disposition_bits(AVFormatContext *avf, char *value,
00439 int stream_id)
00440 {
00441 int flag = 0, i;
00442
00443 for (i = 0; ff_nut_dispositions[i].flag; ++i)
00444 if (!strcmp(ff_nut_dispositions[i].str, value))
00445 flag = ff_nut_dispositions[i].flag;
00446 if (!flag)
00447 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
00448 for (i = 0; i < avf->nb_streams; ++i)
00449 if (stream_id == i || stream_id == -1)
00450 avf->streams[i]->disposition |= flag;
00451 }
00452
00453 static int decode_info_header(NUTContext *nut)
00454 {
00455 AVFormatContext *s = nut->avf;
00456 AVIOContext *bc = s->pb;
00457 uint64_t tmp, chapter_start, chapter_len;
00458 unsigned int stream_id_plus1, count;
00459 int chapter_id, i;
00460 int64_t value, end;
00461 char name[256], str_value[1024], type_str[256];
00462 const char *type;
00463 AVChapter *chapter = NULL;
00464 AVStream *st = NULL;
00465 AVDictionary **metadata = NULL;
00466
00467 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
00468 end += avio_tell(bc);
00469
00470 GET_V(stream_id_plus1, tmp <= s->nb_streams);
00471 chapter_id = get_s(bc);
00472 chapter_start = ffio_read_varlen(bc);
00473 chapter_len = ffio_read_varlen(bc);
00474 count = ffio_read_varlen(bc);
00475
00476 if (chapter_id && !stream_id_plus1) {
00477 int64_t start = chapter_start / nut->time_base_count;
00478 chapter = avpriv_new_chapter(s, chapter_id,
00479 nut->time_base[chapter_start %
00480 nut->time_base_count],
00481 start, start + chapter_len, NULL);
00482 metadata = &chapter->metadata;
00483 } else if (stream_id_plus1) {
00484 st = s->streams[stream_id_plus1 - 1];
00485 metadata = &st->metadata;
00486 } else
00487 metadata = &s->metadata;
00488
00489 for (i = 0; i < count; i++) {
00490 get_str(bc, name, sizeof(name));
00491 value = get_s(bc);
00492 if (value == -1) {
00493 type = "UTF-8";
00494 get_str(bc, str_value, sizeof(str_value));
00495 } else if (value == -2) {
00496 get_str(bc, type_str, sizeof(type_str));
00497 type = type_str;
00498 get_str(bc, str_value, sizeof(str_value));
00499 } else if (value == -3) {
00500 type = "s";
00501 value = get_s(bc);
00502 } else if (value == -4) {
00503 type = "t";
00504 value = ffio_read_varlen(bc);
00505 } else if (value < -4) {
00506 type = "r";
00507 get_s(bc);
00508 } else {
00509 type = "v";
00510 }
00511
00512 if (stream_id_plus1 > s->nb_streams) {
00513 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
00514 continue;
00515 }
00516
00517 if (!strcmp(type, "UTF-8")) {
00518 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
00519 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
00520 continue;
00521 }
00522
00523 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
00524 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
00525 continue;
00526 }
00527
00528 if (metadata && av_strcasecmp(name, "Uses") &&
00529 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces"))
00530 av_dict_set(metadata, name, str_value, 0);
00531 }
00532 }
00533
00534 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
00535 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
00536 return -1;
00537 }
00538 return 0;
00539 }
00540
00541 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
00542 {
00543 AVFormatContext *s = nut->avf;
00544 AVIOContext *bc = s->pb;
00545 int64_t end;
00546 uint64_t tmp;
00547
00548 nut->last_syncpoint_pos = avio_tell(bc) - 8;
00549
00550 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
00551 end += avio_tell(bc);
00552
00553 tmp = ffio_read_varlen(bc);
00554 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
00555 if (*back_ptr < 0)
00556 return -1;
00557
00558 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
00559 tmp / nut->time_base_count);
00560
00561 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
00562 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
00563 return -1;
00564 }
00565
00566 *ts = tmp / nut->time_base_count *
00567 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
00568 ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
00569
00570 return 0;
00571 }
00572
00573
00574 static int64_t find_duration(NUTContext *nut, int64_t filesize)
00575 {
00576 AVFormatContext *s = nut->avf;
00577 int64_t duration = 0;
00578
00579 int64_t pos = FFMAX(0, filesize - 2*nut->max_distance);
00580 for(;;){
00581 int64_t ts = nut_read_timestamp(s, -1, &pos, INT64_MAX);
00582 if(ts < 0)
00583 break;
00584 duration = FFMAX(duration, ts);
00585 pos++;
00586 }
00587 if(duration > 0)
00588 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
00589 return duration;
00590 }
00591
00592 static int find_and_decode_index(NUTContext *nut)
00593 {
00594 AVFormatContext *s = nut->avf;
00595 AVIOContext *bc = s->pb;
00596 uint64_t tmp, end;
00597 int i, j, syncpoint_count;
00598 int64_t filesize = avio_size(bc);
00599 int64_t *syncpoints;
00600 int8_t *has_keyframe;
00601 int ret = -1;
00602
00603 if(filesize <= 0)
00604 return -1;
00605
00606 avio_seek(bc, filesize - 12, SEEK_SET);
00607 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
00608 if (avio_rb64(bc) != INDEX_STARTCODE) {
00609 av_log(s, AV_LOG_ERROR, "no index at the end\n");
00610
00611 if(s->duration<=0)
00612 s->duration = find_duration(nut, filesize);
00613 return -1;
00614 }
00615
00616 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
00617 end += avio_tell(bc);
00618
00619 ffio_read_varlen(bc);
00620 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
00621 syncpoints = av_malloc(sizeof(int64_t) * syncpoint_count);
00622 has_keyframe = av_malloc(sizeof(int8_t) * (syncpoint_count + 1));
00623 for (i = 0; i < syncpoint_count; i++) {
00624 syncpoints[i] = ffio_read_varlen(bc);
00625 if (syncpoints[i] <= 0)
00626 goto fail;
00627 if (i)
00628 syncpoints[i] += syncpoints[i - 1];
00629 }
00630
00631 for (i = 0; i < s->nb_streams; i++) {
00632 int64_t last_pts = -1;
00633 for (j = 0; j < syncpoint_count;) {
00634 uint64_t x = ffio_read_varlen(bc);
00635 int type = x & 1;
00636 int n = j;
00637 x >>= 1;
00638 if (type) {
00639 int flag = x & 1;
00640 x >>= 1;
00641 if (n + x >= syncpoint_count + 1) {
00642 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
00643 goto fail;
00644 }
00645 while (x--)
00646 has_keyframe[n++] = flag;
00647 has_keyframe[n++] = !flag;
00648 } else {
00649 while (x != 1) {
00650 if (n >= syncpoint_count + 1) {
00651 av_log(s, AV_LOG_ERROR, "index overflow B\n");
00652 goto fail;
00653 }
00654 has_keyframe[n++] = x & 1;
00655 x >>= 1;
00656 }
00657 }
00658 if (has_keyframe[0]) {
00659 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
00660 goto fail;
00661 }
00662 av_assert0(n <= syncpoint_count + 1);
00663 for (; j < n && j < syncpoint_count; j++) {
00664 if (has_keyframe[j]) {
00665 uint64_t B, A = ffio_read_varlen(bc);
00666 if (!A) {
00667 A = ffio_read_varlen(bc);
00668 B = ffio_read_varlen(bc);
00669
00670 } else
00671 B = 0;
00672 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
00673 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
00674 last_pts += A + B;
00675 }
00676 }
00677 }
00678 }
00679
00680 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
00681 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
00682 goto fail;
00683 }
00684 ret = 0;
00685
00686 fail:
00687 av_free(syncpoints);
00688 av_free(has_keyframe);
00689 return ret;
00690 }
00691
00692 static int nut_read_header(AVFormatContext *s)
00693 {
00694 NUTContext *nut = s->priv_data;
00695 AVIOContext *bc = s->pb;
00696 int64_t pos;
00697 int initialized_stream_count;
00698
00699 nut->avf = s;
00700
00701
00702 pos = 0;
00703 do {
00704 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
00705 if (pos < 0 + 1) {
00706 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
00707 return AVERROR_INVALIDDATA;
00708 }
00709 } while (decode_main_header(nut) < 0);
00710
00711
00712 pos = 0;
00713 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
00714 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
00715 if (pos < 0 + 1) {
00716 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
00717 return AVERROR_INVALIDDATA;
00718 }
00719 if (decode_stream_header(nut) >= 0)
00720 initialized_stream_count++;
00721 }
00722
00723
00724 pos = 0;
00725 for (;;) {
00726 uint64_t startcode = find_any_startcode(bc, pos);
00727 pos = avio_tell(bc);
00728
00729 if (startcode == 0) {
00730 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
00731 return AVERROR_INVALIDDATA;
00732 } else if (startcode == SYNCPOINT_STARTCODE) {
00733 nut->next_startcode = startcode;
00734 break;
00735 } else if (startcode != INFO_STARTCODE) {
00736 continue;
00737 }
00738
00739 decode_info_header(nut);
00740 }
00741
00742 s->data_offset = pos - 8;
00743
00744 if (bc->seekable) {
00745 int64_t orig_pos = avio_tell(bc);
00746 find_and_decode_index(nut);
00747 avio_seek(bc, orig_pos, SEEK_SET);
00748 }
00749 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
00750
00751 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
00752
00753 return 0;
00754 }
00755
00756 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
00757 uint8_t *header_idx, int frame_code)
00758 {
00759 AVFormatContext *s = nut->avf;
00760 AVIOContext *bc = s->pb;
00761 StreamContext *stc;
00762 int size, flags, size_mul, pts_delta, i, reserved_count;
00763 uint64_t tmp;
00764
00765 if (avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
00766 av_log(s, AV_LOG_ERROR,
00767 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
00768 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
00769 return AVERROR_INVALIDDATA;
00770 }
00771
00772 flags = nut->frame_code[frame_code].flags;
00773 size_mul = nut->frame_code[frame_code].size_mul;
00774 size = nut->frame_code[frame_code].size_lsb;
00775 *stream_id = nut->frame_code[frame_code].stream_id;
00776 pts_delta = nut->frame_code[frame_code].pts_delta;
00777 reserved_count = nut->frame_code[frame_code].reserved_count;
00778 *header_idx = nut->frame_code[frame_code].header_idx;
00779
00780 if (flags & FLAG_INVALID)
00781 return AVERROR_INVALIDDATA;
00782 if (flags & FLAG_CODED)
00783 flags ^= ffio_read_varlen(bc);
00784 if (flags & FLAG_STREAM_ID) {
00785 GET_V(*stream_id, tmp < s->nb_streams);
00786 }
00787 stc = &nut->stream[*stream_id];
00788 if (flags & FLAG_CODED_PTS) {
00789 int coded_pts = ffio_read_varlen(bc);
00790
00791 if (coded_pts < (1 << stc->msb_pts_shift)) {
00792 *pts = ff_lsb2full(stc, coded_pts);
00793 } else
00794 *pts = coded_pts - (1LL << stc->msb_pts_shift);
00795 } else
00796 *pts = stc->last_pts + pts_delta;
00797 if (flags & FLAG_SIZE_MSB)
00798 size += size_mul * ffio_read_varlen(bc);
00799 if (flags & FLAG_MATCH_TIME)
00800 get_s(bc);
00801 if (flags & FLAG_HEADER_IDX)
00802 *header_idx = ffio_read_varlen(bc);
00803 if (flags & FLAG_RESERVED)
00804 reserved_count = ffio_read_varlen(bc);
00805 for (i = 0; i < reserved_count; i++)
00806 ffio_read_varlen(bc);
00807
00808 if (*header_idx >= (unsigned)nut->header_count) {
00809 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
00810 return AVERROR_INVALIDDATA;
00811 }
00812 if (size > 4096)
00813 *header_idx = 0;
00814 size -= nut->header_len[*header_idx];
00815
00816 if (flags & FLAG_CHECKSUM) {
00817 avio_rb32(bc);
00818 } else if (size > 2 * nut->max_distance || FFABS(stc->last_pts - *pts) >
00819 stc->max_pts_distance) {
00820 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
00821 return AVERROR_INVALIDDATA;
00822 }
00823
00824 stc->last_pts = *pts;
00825 stc->last_flags = flags;
00826
00827 return size;
00828 }
00829
00830 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
00831 {
00832 AVFormatContext *s = nut->avf;
00833 AVIOContext *bc = s->pb;
00834 int size, stream_id, discard;
00835 int64_t pts, last_IP_pts;
00836 StreamContext *stc;
00837 uint8_t header_idx;
00838
00839 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
00840 if (size < 0)
00841 return size;
00842
00843 stc = &nut->stream[stream_id];
00844
00845 if (stc->last_flags & FLAG_KEY)
00846 stc->skip_until_key_frame = 0;
00847
00848 discard = s->streams[stream_id]->discard;
00849 last_IP_pts = s->streams[stream_id]->last_IP_pts;
00850 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
00851 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
00852 last_IP_pts > pts) ||
00853 discard >= AVDISCARD_ALL ||
00854 stc->skip_until_key_frame) {
00855 avio_skip(bc, size);
00856 return 1;
00857 }
00858
00859 if (av_new_packet(pkt, size + nut->header_len[header_idx]) < 0)
00860 return AVERROR(ENOMEM);
00861 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
00862 pkt->pos = avio_tell(bc);
00863 avio_read(bc, pkt->data + nut->header_len[header_idx], size);
00864
00865 pkt->stream_index = stream_id;
00866 if (stc->last_flags & FLAG_KEY)
00867 pkt->flags |= AV_PKT_FLAG_KEY;
00868 pkt->pts = pts;
00869
00870 return 0;
00871 }
00872
00873 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
00874 {
00875 NUTContext *nut = s->priv_data;
00876 AVIOContext *bc = s->pb;
00877 int i, frame_code = 0, ret, skip;
00878 int64_t ts, back_ptr;
00879
00880 for (;;) {
00881 int64_t pos = avio_tell(bc);
00882 uint64_t tmp = nut->next_startcode;
00883 nut->next_startcode = 0;
00884
00885 if (tmp) {
00886 pos -= 8;
00887 } else {
00888 frame_code = avio_r8(bc);
00889 if (url_feof(bc))
00890 return -1;
00891 if (frame_code == 'N') {
00892 tmp = frame_code;
00893 for (i = 1; i < 8; i++)
00894 tmp = (tmp << 8) + avio_r8(bc);
00895 }
00896 }
00897 switch (tmp) {
00898 case MAIN_STARTCODE:
00899 case STREAM_STARTCODE:
00900 case INDEX_STARTCODE:
00901 skip = get_packetheader(nut, bc, 0, tmp);
00902 avio_skip(bc, skip);
00903 break;
00904 case INFO_STARTCODE:
00905 if (decode_info_header(nut) < 0)
00906 goto resync;
00907 break;
00908 case SYNCPOINT_STARTCODE:
00909 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
00910 goto resync;
00911 frame_code = avio_r8(bc);
00912 case 0:
00913 ret = decode_frame(nut, pkt, frame_code);
00914 if (ret == 0)
00915 return 0;
00916 else if (ret == 1)
00917 break;
00918 default:
00919 resync:
00920 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
00921 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);
00922 if (tmp == 0)
00923 return AVERROR_INVALIDDATA;
00924 av_log(s, AV_LOG_DEBUG, "sync\n");
00925 nut->next_startcode = tmp;
00926 }
00927 }
00928 }
00929
00930 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
00931 int64_t *pos_arg, int64_t pos_limit)
00932 {
00933 NUTContext *nut = s->priv_data;
00934 AVIOContext *bc = s->pb;
00935 int64_t pos, pts, back_ptr;
00936 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
00937 stream_index, *pos_arg, pos_limit);
00938
00939 pos = *pos_arg;
00940 do {
00941 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
00942 if (pos < 1) {
00943 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
00944 return AV_NOPTS_VALUE;
00945 }
00946 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
00947 *pos_arg = pos - 1;
00948 av_assert0(nut->last_syncpoint_pos == *pos_arg);
00949
00950 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
00951 if (stream_index == -2)
00952 return back_ptr;
00953 av_assert0(stream_index == -1);
00954 return pts;
00955 }
00956
00957 static int read_seek(AVFormatContext *s, int stream_index,
00958 int64_t pts, int flags)
00959 {
00960 NUTContext *nut = s->priv_data;
00961 AVStream *st = s->streams[stream_index];
00962 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
00963 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
00964 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
00965 int64_t pos, pos2, ts;
00966 int i;
00967
00968 if (st->index_entries) {
00969 int index = av_index_search_timestamp(st, pts, flags);
00970 if (index < 0)
00971 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
00972 if (index < 0)
00973 return -1;
00974
00975 pos2 = st->index_entries[index].pos;
00976 ts = st->index_entries[index].timestamp;
00977 } else {
00978 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
00979 (void **) next_node);
00980 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
00981 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
00982 next_node[1]->ts);
00983 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
00984 next_node[1]->pos, next_node[1]->pos,
00985 next_node[0]->ts, next_node[1]->ts,
00986 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
00987
00988 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
00989 dummy.pos = pos + 16;
00990 next_node[1] = &nopts_sp;
00991 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
00992 (void **) next_node);
00993 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
00994 next_node[1]->pos, next_node[1]->pos,
00995 next_node[0]->back_ptr, next_node[1]->back_ptr,
00996 flags, &ts, nut_read_timestamp);
00997 if (pos2 >= 0)
00998 pos = pos2;
00999
01000 }
01001 dummy.pos = pos;
01002 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
01003 NULL);
01004
01005 av_assert0(sp);
01006 pos2 = sp->back_ptr - 15;
01007 }
01008 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
01009 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
01010 avio_seek(s->pb, pos, SEEK_SET);
01011 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
01012 if (pos2 > pos || pos2 + 15 < pos)
01013 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
01014 for (i = 0; i < s->nb_streams; i++)
01015 nut->stream[i].skip_until_key_frame = 1;
01016
01017 return 0;
01018 }
01019
01020 static int nut_read_close(AVFormatContext *s)
01021 {
01022 NUTContext *nut = s->priv_data;
01023 int i;
01024
01025 av_freep(&nut->time_base);
01026 av_freep(&nut->stream);
01027 ff_nut_free_sp(nut);
01028 for (i = 1; i < nut->header_count; i++)
01029 av_freep(&nut->header[i]);
01030
01031 return 0;
01032 }
01033
01034 AVInputFormat ff_nut_demuxer = {
01035 .name = "nut",
01036 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
01037 .flags = AVFMT_SEEK_TO_PTS,
01038 .priv_data_size = sizeof(NUTContext),
01039 .read_probe = nut_probe,
01040 .read_header = nut_read_header,
01041 .read_packet = nut_read_packet,
01042 .read_close = nut_read_close,
01043 .read_seek = read_seek,
01044 .extensions = "nut",
01045 .codec_tag = ff_nut_codec_tags,
01046 };