1 /*
2 * ASF compatible demuxer
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <inttypes.h>
23
24 #include "libavutil/attributes.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/bswap.h"
28 #include "libavutil/common.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/opt.h"
33 #include "avformat.h"
34 #include "avio_internal.h"
35 #include "avlanguage.h"
36 #include "id3v2.h"
37 #include "internal.h"
38 #include "riff.h"
39 #include "asf.h"
40 #include "asfcrypt.h"
41
42 typedef struct {
43 const AVClass *class;
44 int asfid2avid[128]; ///< conversion table from asf ID 2 AVStream ID
45 ASFStream streams[128]; ///< it's max number and it's not that big
46 uint32_t stream_bitrates[128]; ///< max number of streams, bitrate for each (for streaming)
47 AVRational dar[128];
48 char stream_languages[128][6]; ///< max number of streams, language for each (RFC1766, e.g. en-US)
49 /* non streamed additonnal info */
50 /* packet filling */
51 int packet_size_left;
52 /* only for reading */
53 uint64_t data_offset; ///< beginning of the first data packet
54 uint64_t data_object_offset; ///< data object offset (excl. GUID & size)
55 uint64_t data_object_size; ///< size of the data object
56 int index_read;
57
58 ASFMainHeader hdr;
59
60 int packet_flags;
61 int packet_property;
62 int packet_timestamp;
63 int packet_segsizetype;
64 int packet_segments;
65 int packet_seq;
66 int packet_replic_size;
67 int packet_key_frame;
68 int packet_padsize;
69 unsigned int packet_frag_offset;
70 unsigned int packet_frag_size;
71 int64_t packet_frag_timestamp;
72 int ts_is_pts;
73 int packet_multi_size;
74 int packet_time_delta;
75 int packet_time_start;
76 int64_t packet_pos;
77
78 int stream_index;
79
80 ASFStream *asf_st; ///< currently decoded stream
81
82 int no_resync_search;
83 } ASFContext;
84
85 static const AVOption options[] = {
86 { "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
87 { NULL },
88 };
89
90 static const AVClass asf_class = {
91 .class_name = "asf demuxer",
92 .item_name = av_default_item_name,
93 .option = options,
94 .version = LIBAVUTIL_VERSION_INT,
95 };
96
97 #undef NDEBUG
98 #include <assert.h>
99
100 #define ASF_MAX_STREAMS 127
101 #define FRAME_HEADER_SIZE 16
102 // Fix Me! FRAME_HEADER_SIZE may be different. (17 is known to be too large)
103
104 #ifdef DEBUG
105 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
106 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
107 };
108
109 #define PRINT_IF_GUID(g, cmp) \
110 if (!ff_guidcmp(g, &cmp)) \
111 av_dlog(NULL, "(GUID: %s) ", # cmp)
112
print_guid(ff_asf_guid * g)113 static void print_guid(ff_asf_guid *g)
114 {
115 int i;
116 PRINT_IF_GUID(g, ff_asf_header);
117 else PRINT_IF_GUID(g, ff_asf_file_header);
118 else PRINT_IF_GUID(g, ff_asf_stream_header);
119 else PRINT_IF_GUID(g, ff_asf_audio_stream);
120 else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
121 else PRINT_IF_GUID(g, ff_asf_video_stream);
122 else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
123 else PRINT_IF_GUID(g, ff_asf_command_stream);
124 else PRINT_IF_GUID(g, ff_asf_comment_header);
125 else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
126 else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
127 else PRINT_IF_GUID(g, ff_asf_data_header);
128 else PRINT_IF_GUID(g, ff_asf_simple_index_header);
129 else PRINT_IF_GUID(g, ff_asf_head1_guid);
130 else PRINT_IF_GUID(g, ff_asf_head2_guid);
131 else PRINT_IF_GUID(g, ff_asf_my_guid);
132 else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
133 else PRINT_IF_GUID(g, ff_asf_extended_content_header);
134 else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
135 else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
136 else PRINT_IF_GUID(g, ff_asf_metadata_header);
137 else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
138 else PRINT_IF_GUID(g, ff_asf_marker_header);
139 else PRINT_IF_GUID(g, stream_bitrate_guid);
140 else PRINT_IF_GUID(g, ff_asf_language_guid);
141 else
142 av_dlog(NULL, "(GUID: unknown) ");
143 for (i = 0; i < 16; i++)
144 av_dlog(NULL, " 0x%02x,", (*g)[i]);
145 av_dlog(NULL, "}\n");
146 }
147 #undef PRINT_IF_GUID
148 #else
149 #define print_guid(g)
150 #endif
151
asf_probe(AVProbeData * pd)152 static int asf_probe(AVProbeData *pd)
153 {
154 /* check file header */
155 if (!ff_guidcmp(pd->buf, &ff_asf_header))
156 return AVPROBE_SCORE_MAX;
157 else
158 return 0;
159 }
160
161 /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
162 * but 16 bit for "Metadata Object" and "Metadata Library Object" */
get_value(AVIOContext * pb,int type,int type2_size)163 static int get_value(AVIOContext *pb, int type, int type2_size)
164 {
165 switch (type) {
166 case 2:
167 return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
168 case 3:
169 return avio_rl32(pb);
170 case 4:
171 return avio_rl64(pb);
172 case 5:
173 return avio_rl16(pb);
174 default:
175 return INT_MIN;
176 }
177 }
178
179 /* MSDN claims that this should be "compatible with the ID3 frame, APIC",
180 * but in reality this is only loosely similar */
asf_read_picture(AVFormatContext * s,int len)181 static int asf_read_picture(AVFormatContext *s, int len)
182 {
183 AVPacket pkt = { 0 };
184 const CodecMime *mime = ff_id3v2_mime_tags;
185 enum AVCodecID id = AV_CODEC_ID_NONE;
186 char mimetype[64];
187 uint8_t *desc = NULL;
188 AVStream *st = NULL;
189 int ret, type, picsize, desc_len;
190
191 /* type + picsize + mime + desc */
192 if (len < 1 + 4 + 2 + 2) {
193 av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
194 return AVERROR_INVALIDDATA;
195 }
196
197 /* picture type */
198 type = avio_r8(s->pb);
199 len--;
200 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
201 av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
202 type = 0;
203 }
204
205 /* picture data size */
206 picsize = avio_rl32(s->pb);
207 len -= 4;
208
209 /* picture MIME type */
210 len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
211 while (mime->id != AV_CODEC_ID_NONE) {
212 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
213 id = mime->id;
214 break;
215 }
216 mime++;
217 }
218 if (id == AV_CODEC_ID_NONE) {
219 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
220 mimetype);
221 return 0;
222 }
223
224 if (picsize >= len) {
225 av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
226 picsize, len);
227 return AVERROR_INVALIDDATA;
228 }
229
230 /* picture description */
231 desc_len = (len - picsize) * 2 + 1;
232 desc = av_malloc(desc_len);
233 if (!desc)
234 return AVERROR(ENOMEM);
235 len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
236
237 ret = av_get_packet(s->pb, &pkt, picsize);
238 if (ret < 0)
239 goto fail;
240
241 st = avformat_new_stream(s, NULL);
242 if (!st) {
243 ret = AVERROR(ENOMEM);
244 goto fail;
245 }
246 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
247 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
248 st->codec->codec_id = id;
249 st->attached_pic = pkt;
250 st->attached_pic.stream_index = st->index;
251 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
252
253 if (*desc)
254 av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
255 else
256 av_freep(&desc);
257
258 av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
259
260 return 0;
261
262 fail:
263 av_freep(&desc);
264 av_free_packet(&pkt);
265 return ret;
266 }
267
get_id3_tag(AVFormatContext * s,int len)268 static void get_id3_tag(AVFormatContext *s, int len)
269 {
270 ID3v2ExtraMeta *id3v2_extra_meta = NULL;
271
272 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, len);
273 if (id3v2_extra_meta)
274 ff_id3v2_parse_apic(s, &id3v2_extra_meta);
275 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
276 }
277
get_tag(AVFormatContext * s,const char * key,int type,int len,int type2_size)278 static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
279 {
280 char *value;
281 int64_t off = avio_tell(s->pb);
282 #define LEN 22
283
284 if ((unsigned)len >= (UINT_MAX - LEN) / 2)
285 return;
286
287 value = av_malloc(2 * len + LEN);
288 if (!value)
289 goto finish;
290
291 if (type == 0) { // UTF16-LE
292 avio_get_str16le(s->pb, len, value, 2 * len + 1);
293 } else if (type == -1) { // ASCII
294 avio_read(s->pb, value, len);
295 value[len]=0;
296 } else if (type == 1) { // byte array
297 if (!strcmp(key, "WM/Picture")) { // handle cover art
298 asf_read_picture(s, len);
299 } else if (!strcmp(key, "ID3")) { // handle ID3 tag
300 get_id3_tag(s, len);
301 } else {
302 av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
303 }
304 goto finish;
305 } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
306 uint64_t num = get_value(s->pb, type, type2_size);
307 snprintf(value, LEN, "%"PRIu64, num);
308 } else if (type == 6) { // (don't) handle GUID
309 av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
310 goto finish;
311 } else {
312 av_log(s, AV_LOG_DEBUG,
313 "Unsupported value type %d in tag %s.\n", type, key);
314 goto finish;
315 }
316 if (*value)
317 av_dict_set(&s->metadata, key, value, 0);
318
319 finish:
320 av_freep(&value);
321 avio_seek(s->pb, off + len, SEEK_SET);
322 }
323
asf_read_file_properties(AVFormatContext * s,int64_t size)324 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
325 {
326 ASFContext *asf = s->priv_data;
327 AVIOContext *pb = s->pb;
328
329 ff_get_guid(pb, &asf->hdr.guid);
330 asf->hdr.file_size = avio_rl64(pb);
331 asf->hdr.create_time = avio_rl64(pb);
332 avio_rl64(pb); /* number of packets */
333 asf->hdr.play_time = avio_rl64(pb);
334 asf->hdr.send_time = avio_rl64(pb);
335 asf->hdr.preroll = avio_rl32(pb);
336 asf->hdr.ignore = avio_rl32(pb);
337 asf->hdr.flags = avio_rl32(pb);
338 asf->hdr.min_pktsize = avio_rl32(pb);
339 asf->hdr.max_pktsize = avio_rl32(pb);
340 if (asf->hdr.min_pktsize >= (1U << 29))
341 return AVERROR_INVALIDDATA;
342 asf->hdr.max_bitrate = avio_rl32(pb);
343 s->packet_size = asf->hdr.max_pktsize;
344
345 return 0;
346 }
347
asf_read_stream_properties(AVFormatContext * s,int64_t size)348 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
349 {
350 ASFContext *asf = s->priv_data;
351 AVIOContext *pb = s->pb;
352 AVStream *st;
353 ASFStream *asf_st;
354 ff_asf_guid g;
355 enum AVMediaType type;
356 int type_specific_size, sizeX;
357 unsigned int tag1;
358 int64_t pos1, pos2, start_time;
359 int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
360
361 if (s->nb_streams == ASF_MAX_STREAMS) {
362 av_log(s, AV_LOG_ERROR, "too many streams\n");
363 return AVERROR(EINVAL);
364 }
365
366 pos1 = avio_tell(pb);
367
368 st = avformat_new_stream(s, NULL);
369 if (!st)
370 return AVERROR(ENOMEM);
371 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
372 start_time = asf->hdr.preroll;
373
374 if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
375 int64_t fsize = avio_size(pb);
376 if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 ||
377 FFABS(fsize - (int64_t)asf->hdr.file_size) / (float)FFMIN(fsize, asf->hdr.file_size) < 0.05)
378 st->duration = asf->hdr.play_time /
379 (10000000 / 1000) - start_time;
380 }
381 ff_get_guid(pb, &g);
382
383 test_for_ext_stream_audio = 0;
384 if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
385 type = AVMEDIA_TYPE_AUDIO;
386 } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
387 type = AVMEDIA_TYPE_VIDEO;
388 } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
389 type = AVMEDIA_TYPE_VIDEO;
390 st->codec->codec_id = AV_CODEC_ID_MJPEG;
391 } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
392 type = AVMEDIA_TYPE_DATA;
393 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
394 test_for_ext_stream_audio = 1;
395 type = AVMEDIA_TYPE_UNKNOWN;
396 } else {
397 return -1;
398 }
399 ff_get_guid(pb, &g);
400 avio_skip(pb, 8); /* total_size */
401 type_specific_size = avio_rl32(pb);
402 avio_rl32(pb);
403 st->id = avio_rl16(pb) & 0x7f; /* stream id */
404 // mapping of asf ID to AV stream ID;
405 asf->asfid2avid[st->id] = s->nb_streams - 1;
406 asf_st = &asf->streams[st->id];
407
408 avio_rl32(pb);
409
410 if (test_for_ext_stream_audio) {
411 ff_get_guid(pb, &g);
412 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
413 type = AVMEDIA_TYPE_AUDIO;
414 is_dvr_ms_audio = 1;
415 ff_get_guid(pb, &g);
416 avio_rl32(pb);
417 avio_rl32(pb);
418 avio_rl32(pb);
419 ff_get_guid(pb, &g);
420 avio_rl32(pb);
421 }
422 }
423
424 st->codec->codec_type = type;
425 if (type == AVMEDIA_TYPE_AUDIO) {
426 int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
427 if (ret < 0)
428 return ret;
429 if (is_dvr_ms_audio) {
430 // codec_id and codec_tag are unreliable in dvr_ms
431 // files. Set them later by probing stream.
432 st->request_probe = 1;
433 st->codec->codec_tag = 0;
434 }
435 if (st->codec->codec_id == AV_CODEC_ID_AAC)
436 st->need_parsing = AVSTREAM_PARSE_NONE;
437 else
438 st->need_parsing = AVSTREAM_PARSE_FULL;
439 /* We have to init the frame size at some point .... */
440 pos2 = avio_tell(pb);
441 if (size >= (pos2 + 8 - pos1 + 24)) {
442 asf_st->ds_span = avio_r8(pb);
443 asf_st->ds_packet_size = avio_rl16(pb);
444 asf_st->ds_chunk_size = avio_rl16(pb);
445 avio_rl16(pb); // ds_data_size
446 avio_r8(pb); // ds_silence_data
447 }
448 if (asf_st->ds_span > 1) {
449 if (!asf_st->ds_chunk_size ||
450 (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
451 asf_st->ds_packet_size % asf_st->ds_chunk_size)
452 asf_st->ds_span = 0; // disable descrambling
453 }
454 } else if (type == AVMEDIA_TYPE_VIDEO &&
455 size - (avio_tell(pb) - pos1 + 24) >= 51) {
456 avio_rl32(pb);
457 avio_rl32(pb);
458 avio_r8(pb);
459 avio_rl16(pb); /* size */
460 sizeX = avio_rl32(pb); /* size */
461 st->codec->width = avio_rl32(pb);
462 st->codec->height = avio_rl32(pb);
463 /* not available for asf */
464 avio_rl16(pb); /* panes */
465 st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
466 tag1 = avio_rl32(pb);
467 avio_skip(pb, 20);
468 if (sizeX > 40) {
469 st->codec->extradata_size = ffio_limit(pb, sizeX - 40);
470 st->codec->extradata = av_mallocz(st->codec->extradata_size +
471 FF_INPUT_BUFFER_PADDING_SIZE);
472 if (!st->codec->extradata)
473 return AVERROR(ENOMEM);
474 avio_read(pb, st->codec->extradata, st->codec->extradata_size);
475 }
476
477 /* Extract palette from extradata if bpp <= 8 */
478 /* This code assumes that extradata contains only palette */
479 /* This is true for all paletted codecs implemented in libavcodec */
480 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
481 #if HAVE_BIGENDIAN
482 int i;
483 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++)
484 asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]);
485 #else
486 memcpy(asf_st->palette, st->codec->extradata,
487 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
488 #endif
489 asf_st->palette_changed = 1;
490 }
491
492 st->codec->codec_tag = tag1;
493 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
494 if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
495 st->need_parsing = AVSTREAM_PARSE_FULL;
496 /* issue658 contains wrong w/h and MS even puts a fake seq header
497 * with wrong w/h in extradata while a correct one is in the stream.
498 * maximum lameness */
499 st->codec->width =
500 st->codec->height = 0;
501 av_freep(&st->codec->extradata);
502 st->codec->extradata_size = 0;
503 }
504 if (st->codec->codec_id == AV_CODEC_ID_H264)
505 st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
506 if (st->codec->codec_id == AV_CODEC_ID_MPEG4)
507 st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
508 }
509 pos2 = avio_tell(pb);
510 avio_skip(pb, size - (pos2 - pos1 + 24));
511
512 return 0;
513 }
514
asf_read_ext_stream_properties(AVFormatContext * s,int64_t size)515 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
516 {
517 ASFContext *asf = s->priv_data;
518 AVIOContext *pb = s->pb;
519 ff_asf_guid g;
520 int ext_len, payload_ext_ct, stream_ct, i;
521 uint32_t leak_rate, stream_num;
522 unsigned int stream_languageid_index;
523
524 avio_rl64(pb); // starttime
525 avio_rl64(pb); // endtime
526 leak_rate = avio_rl32(pb); // leak-datarate
527 avio_rl32(pb); // bucket-datasize
528 avio_rl32(pb); // init-bucket-fullness
529 avio_rl32(pb); // alt-leak-datarate
530 avio_rl32(pb); // alt-bucket-datasize
531 avio_rl32(pb); // alt-init-bucket-fullness
532 avio_rl32(pb); // max-object-size
533 avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
534 stream_num = avio_rl16(pb); // stream-num
535
536 stream_languageid_index = avio_rl16(pb); // stream-language-id-index
537 if (stream_num < 128)
538 asf->streams[stream_num].stream_language_index = stream_languageid_index;
539
540 avio_rl64(pb); // avg frametime in 100ns units
541 stream_ct = avio_rl16(pb); // stream-name-count
542 payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
543
544 if (stream_num < 128) {
545 asf->stream_bitrates[stream_num] = leak_rate;
546 asf->streams[stream_num].payload_ext_ct = 0;
547 }
548
549 for (i = 0; i < stream_ct; i++) {
550 avio_rl16(pb);
551 ext_len = avio_rl16(pb);
552 avio_skip(pb, ext_len);
553 }
554
555 for (i = 0; i < payload_ext_ct; i++) {
556 int size;
557 ff_get_guid(pb, &g);
558 size = avio_rl16(pb);
559 ext_len = avio_rl32(pb);
560 avio_skip(pb, ext_len);
561 if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
562 ASFPayload *p = &asf->streams[stream_num].payload[i];
563 p->type = g[0];
564 p->size = size;
565 av_log(s, AV_LOG_DEBUG, "Payload extension %x %d\n", g[0], p->size );
566 asf->streams[stream_num].payload_ext_ct ++;
567 }
568 }
569
570 return 0;
571 }
572
asf_read_content_desc(AVFormatContext * s,int64_t size)573 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
574 {
575 AVIOContext *pb = s->pb;
576 int len1, len2, len3, len4, len5;
577
578 len1 = avio_rl16(pb);
579 len2 = avio_rl16(pb);
580 len3 = avio_rl16(pb);
581 len4 = avio_rl16(pb);
582 len5 = avio_rl16(pb);
583 get_tag(s, "title", 0, len1, 32);
584 get_tag(s, "author", 0, len2, 32);
585 get_tag(s, "copyright", 0, len3, 32);
586 get_tag(s, "comment", 0, len4, 32);
587 avio_skip(pb, len5);
588
589 return 0;
590 }
591
asf_read_ext_content_desc(AVFormatContext * s,int64_t size)592 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
593 {
594 AVIOContext *pb = s->pb;
595 ASFContext *asf = s->priv_data;
596 int desc_count, i, ret;
597
598 desc_count = avio_rl16(pb);
599 for (i = 0; i < desc_count; i++) {
600 int name_len, value_type, value_len;
601 char name[1024];
602
603 name_len = avio_rl16(pb);
604 if (name_len % 2) // must be even, broken lavf versions wrote len-1
605 name_len += 1;
606 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
607 avio_skip(pb, name_len - ret);
608 value_type = avio_rl16(pb);
609 value_len = avio_rl16(pb);
610 if (!value_type && value_len % 2)
611 value_len += 1;
612 /* My sample has that stream set to 0 maybe that mean the container.
613 * ASF stream count starts at 1. I am using 0 to the container value
614 * since it's unused. */
615 if (!strcmp(name, "AspectRatioX"))
616 asf->dar[0].num = get_value(s->pb, value_type, 32);
617 else if (!strcmp(name, "AspectRatioY"))
618 asf->dar[0].den = get_value(s->pb, value_type, 32);
619 else
620 get_tag(s, name, value_type, value_len, 32);
621 }
622
623 return 0;
624 }
625
asf_read_language_list(AVFormatContext * s,int64_t size)626 static int asf_read_language_list(AVFormatContext *s, int64_t size)
627 {
628 AVIOContext *pb = s->pb;
629 ASFContext *asf = s->priv_data;
630 int j, ret;
631 int stream_count = avio_rl16(pb);
632 for (j = 0; j < stream_count; j++) {
633 char lang[6];
634 unsigned int lang_len = avio_r8(pb);
635 if ((ret = avio_get_str16le(pb, lang_len, lang,
636 sizeof(lang))) < lang_len)
637 avio_skip(pb, lang_len - ret);
638 if (j < 128)
639 av_strlcpy(asf->stream_languages[j], lang,
640 sizeof(*asf->stream_languages));
641 }
642
643 return 0;
644 }
645
asf_read_metadata(AVFormatContext * s,int64_t size)646 static int asf_read_metadata(AVFormatContext *s, int64_t size)
647 {
648 AVIOContext *pb = s->pb;
649 ASFContext *asf = s->priv_data;
650 int n, stream_num, name_len, value_len;
651 int ret, i;
652 n = avio_rl16(pb);
653
654 for (i = 0; i < n; i++) {
655 char name[1024];
656 int value_type;
657
658 avio_rl16(pb); // lang_list_index
659 stream_num = avio_rl16(pb);
660 name_len = avio_rl16(pb);
661 value_type = avio_rl16(pb); /* value_type */
662 value_len = avio_rl32(pb);
663
664 if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
665 avio_skip(pb, name_len - ret);
666 av_dlog(s, "%d stream %d name_len %2d type %d len %4d <%s>\n",
667 i, stream_num, name_len, value_type, value_len, name);
668
669 if (!strcmp(name, "AspectRatioX")){
670 int aspect_x = get_value(s->pb, value_type, 16);
671 if(stream_num < 128)
672 asf->dar[stream_num].num = aspect_x;
673 } else if(!strcmp(name, "AspectRatioY")){
674 int aspect_y = get_value(s->pb, value_type, 16);
675 if(stream_num < 128)
676 asf->dar[stream_num].den = aspect_y;
677 } else {
678 get_tag(s, name, value_type, value_len, 16);
679 }
680 }
681
682 return 0;
683 }
684
asf_read_marker(AVFormatContext * s,int64_t size)685 static int asf_read_marker(AVFormatContext *s, int64_t size)
686 {
687 AVIOContext *pb = s->pb;
688 ASFContext *asf = s->priv_data;
689 int i, count, name_len, ret;
690 char name[1024];
691
692 avio_rl64(pb); // reserved 16 bytes
693 avio_rl64(pb); // ...
694 count = avio_rl32(pb); // markers count
695 avio_rl16(pb); // reserved 2 bytes
696 name_len = avio_rl16(pb); // name length
697 for (i = 0; i < name_len; i++)
698 avio_r8(pb); // skip the name
699
700 for (i = 0; i < count; i++) {
701 int64_t pres_time;
702 int name_len;
703
704 avio_rl64(pb); // offset, 8 bytes
705 pres_time = avio_rl64(pb); // presentation time
706 pres_time -= asf->hdr.preroll * 10000;
707 avio_rl16(pb); // entry length
708 avio_rl32(pb); // send time
709 avio_rl32(pb); // flags
710 name_len = avio_rl32(pb); // name length
711 if ((ret = avio_get_str16le(pb, name_len * 2, name,
712 sizeof(name))) < name_len)
713 avio_skip(pb, name_len - ret);
714 avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
715 AV_NOPTS_VALUE, name);
716 }
717
718 return 0;
719 }
720
asf_read_header(AVFormatContext * s)721 static int asf_read_header(AVFormatContext *s)
722 {
723 ASFContext *asf = s->priv_data;
724 ff_asf_guid g;
725 AVIOContext *pb = s->pb;
726 int i;
727 int64_t gsize;
728
729 ff_get_guid(pb, &g);
730 if (ff_guidcmp(&g, &ff_asf_header))
731 return AVERROR_INVALIDDATA;
732 avio_rl64(pb);
733 avio_rl32(pb);
734 avio_r8(pb);
735 avio_r8(pb);
736 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
737
738 for (i = 0; i<128; i++)
739 asf->streams[i].stream_language_index = 128; // invalid stream index means no language info
740
741 for (;;) {
742 uint64_t gpos = avio_tell(pb);
743 ff_get_guid(pb, &g);
744 gsize = avio_rl64(pb);
745 print_guid(&g);
746 if (!ff_guidcmp(&g, &ff_asf_data_header)) {
747 asf->data_object_offset = avio_tell(pb);
748 /* If not streaming, gsize is not unlimited (how?),
749 * and there is enough space in the file.. */
750 if (!(asf->hdr.flags & 0x01) && gsize >= 100)
751 asf->data_object_size = gsize - 24;
752 else
753 asf->data_object_size = (uint64_t)-1;
754 break;
755 }
756 if (gsize < 24)
757 return AVERROR_INVALIDDATA;
758 if (!ff_guidcmp(&g, &ff_asf_file_header)) {
759 int ret = asf_read_file_properties(s, gsize);
760 if (ret < 0)
761 return ret;
762 } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
763 int ret = asf_read_stream_properties(s, gsize);
764 if (ret < 0)
765 return ret;
766 } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
767 asf_read_content_desc(s, gsize);
768 } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
769 asf_read_language_list(s, gsize);
770 } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
771 asf_read_ext_content_desc(s, gsize);
772 } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
773 asf_read_metadata(s, gsize);
774 } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
775 asf_read_metadata(s, gsize);
776 } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
777 asf_read_ext_stream_properties(s, gsize);
778
779 // there could be a optional stream properties object to follow
780 // if so the next iteration will pick it up
781 continue;
782 } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
783 ff_get_guid(pb, &g);
784 avio_skip(pb, 6);
785 continue;
786 } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
787 asf_read_marker(s, gsize);
788 } else if (avio_feof(pb)) {
789 return AVERROR_EOF;
790 } else {
791 if (!s->keylen) {
792 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
793 unsigned int len;
794 AVPacket pkt;
795 av_log(s, AV_LOG_WARNING,
796 "DRM protected stream detected, decoding will likely fail!\n");
797 len= avio_rl32(pb);
798 av_log(s, AV_LOG_DEBUG, "Secret data:\n");
799 av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);
800 len= avio_rl32(pb);
801 get_tag(s, "ASF_Protection_Type", -1, len, 32);
802 len= avio_rl32(pb);
803 get_tag(s, "ASF_Key_ID", -1, len, 32);
804 len= avio_rl32(pb);
805 get_tag(s, "ASF_License_URL", -1, len, 32);
806 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
807 av_log(s, AV_LOG_WARNING,
808 "Ext DRM protected stream detected, decoding will likely fail!\n");
809 av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
810 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
811 av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
812 }
813 }
814 }
815 if (avio_tell(pb) != gpos + gsize)
816 av_log(s, AV_LOG_DEBUG,
817 "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
818 avio_tell(pb) - gpos, gsize);
819 avio_seek(pb, gpos + gsize, SEEK_SET);
820 }
821 ff_get_guid(pb, &g);
822 avio_rl64(pb);
823 avio_r8(pb);
824 avio_r8(pb);
825 if (avio_feof(pb))
826 return AVERROR_EOF;
827 asf->data_offset = avio_tell(pb);
828 asf->packet_size_left = 0;
829
830 for (i = 0; i < 128; i++) {
831 int stream_num = asf->asfid2avid[i];
832 if (stream_num >= 0) {
833 AVStream *st = s->streams[stream_num];
834 if (!st->codec->bit_rate)
835 st->codec->bit_rate = asf->stream_bitrates[i];
836 if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
837 av_reduce(&st->sample_aspect_ratio.num,
838 &st->sample_aspect_ratio.den,
839 asf->dar[i].num, asf->dar[i].den, INT_MAX);
840 } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
841 // Use ASF container value if the stream doesn't set AR.
842 (st->codec->codec_type == AVMEDIA_TYPE_VIDEO))
843 av_reduce(&st->sample_aspect_ratio.num,
844 &st->sample_aspect_ratio.den,
845 asf->dar[0].num, asf->dar[0].den, INT_MAX);
846
847 av_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
848 i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,
849 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
850
851 // copy and convert language codes to the frontend
852 if (asf->streams[i].stream_language_index < 128) {
853 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
854 if (rfc1766 && strlen(rfc1766) > 1) {
855 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
856 const char *iso6392 = av_convert_lang_to(primary_tag,
857 AV_LANG_ISO639_2_BIBL);
858 if (iso6392)
859 av_dict_set(&st->metadata, "language", iso6392, 0);
860 }
861 }
862 }
863 }
864
865 ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
866
867 return 0;
868 }
869
870 #define DO_2BITS(bits, var, defval) \
871 switch (bits & 3) { \
872 case 3: \
873 var = avio_rl32(pb); \
874 rsize += 4; \
875 break; \
876 case 2: \
877 var = avio_rl16(pb); \
878 rsize += 2; \
879 break; \
880 case 1: \
881 var = avio_r8(pb); \
882 rsize++; \
883 break; \
884 default: \
885 var = defval; \
886 break; \
887 }
888
889 /**
890 * Load a single ASF packet into the demuxer.
891 * @param s demux context
892 * @param pb context to read data from
893 * @return 0 on success, <0 on error
894 */
asf_get_packet(AVFormatContext * s,AVIOContext * pb)895 static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
896 {
897 ASFContext *asf = s->priv_data;
898 uint32_t packet_length, padsize;
899 int rsize = 8;
900 int c, d, e, off;
901
902 // if we do not know packet size, allow skipping up to 32 kB
903 off = 32768;
904 if (asf->no_resync_search)
905 off = 3;
906 else if (s->packet_size > 0)
907 off = (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
908
909 c = d = e = -1;
910 while (off-- > 0) {
911 c = d;
912 d = e;
913 e = avio_r8(pb);
914 if (c == 0x82 && !d && !e)
915 break;
916 }
917
918 if (c != 0x82) {
919 /* This code allows handling of -EAGAIN at packet boundaries (i.e.
920 * if the packet sync code above triggers -EAGAIN). This does not
921 * imply complete -EAGAIN handling support at random positions in
922 * the stream. */
923 if (pb->error == AVERROR(EAGAIN))
924 return AVERROR(EAGAIN);
925 if (!avio_feof(pb))
926 av_log(s, AV_LOG_ERROR,
927 "ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
928 }
929 if ((c & 0x8f) == 0x82) {
930 if (d || e) {
931 if (!avio_feof(pb))
932 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
933 return AVERROR_INVALIDDATA;
934 }
935 c = avio_r8(pb);
936 d = avio_r8(pb);
937 rsize += 3;
938 } else if(!avio_feof(pb)) {
939 avio_seek(pb, -1, SEEK_CUR); // FIXME
940 }
941
942 asf->packet_flags = c;
943 asf->packet_property = d;
944
945 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
946 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
947 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
948
949 // the following checks prevent overflows and infinite loops
950 if (!packet_length || packet_length >= (1U << 29)) {
951 av_log(s, AV_LOG_ERROR,
952 "invalid packet_length %"PRIu32" at:%"PRId64"\n",
953 packet_length, avio_tell(pb));
954 return AVERROR_INVALIDDATA;
955 }
956 if (padsize >= packet_length) {
957 av_log(s, AV_LOG_ERROR,
958 "invalid padsize %"PRIu32" at:%"PRId64"\n", padsize, avio_tell(pb));
959 return AVERROR_INVALIDDATA;
960 }
961
962 asf->packet_timestamp = avio_rl32(pb);
963 avio_rl16(pb); /* duration */
964 // rsize has at least 11 bytes which have to be present
965
966 if (asf->packet_flags & 0x01) {
967 asf->packet_segsizetype = avio_r8(pb);
968 rsize++;
969 asf->packet_segments = asf->packet_segsizetype & 0x3f;
970 } else {
971 asf->packet_segments = 1;
972 asf->packet_segsizetype = 0x80;
973 }
974 if (rsize > packet_length - padsize) {
975 asf->packet_size_left = 0;
976 av_log(s, AV_LOG_ERROR,
977 "invalid packet header length %d for pktlen %"PRIu32"-%"PRIu32" at %"PRId64"\n",
978 rsize, packet_length, padsize, avio_tell(pb));
979 return AVERROR_INVALIDDATA;
980 }
981 asf->packet_size_left = packet_length - padsize - rsize;
982 if (packet_length < asf->hdr.min_pktsize)
983 padsize += asf->hdr.min_pktsize - packet_length;
984 asf->packet_padsize = padsize;
985 av_dlog(s, "packet: size=%d padsize=%d left=%d\n",
986 s->packet_size, asf->packet_padsize, asf->packet_size_left);
987 return 0;
988 }
989
990 /**
991 *
992 * @return <0 if error
993 */
asf_read_frame_header(AVFormatContext * s,AVIOContext * pb)994 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)
995 {
996 ASFContext *asf = s->priv_data;
997 ASFStream *asfst;
998 int rsize = 1;
999 int num = avio_r8(pb);
1000 int i;
1001 int64_t ts0, ts1 av_unused;
1002
1003 asf->packet_segments--;
1004 asf->packet_key_frame = num >> 7;
1005 asf->stream_index = asf->asfid2avid[num & 0x7f];
1006 asfst = &asf->streams[num & 0x7f];
1007 // sequence should be ignored!
1008 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
1009 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
1010 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
1011 av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
1012 asf->packet_key_frame, asf->stream_index, asf->packet_seq,
1013 asf->packet_frag_offset, asf->packet_replic_size);
1014 if (rsize+(int64_t)asf->packet_replic_size > asf->packet_size_left) {
1015 av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
1016 return AVERROR_INVALIDDATA;
1017 }
1018 if (asf->packet_replic_size >= 8) {
1019 int64_t end = avio_tell(pb) + asf->packet_replic_size;
1020 AVRational aspect;
1021 asfst->packet_obj_size = avio_rl32(pb);
1022 if (asfst->packet_obj_size >= (1 << 24) || asfst->packet_obj_size <= 0) {
1023 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
1024 asfst->packet_obj_size = 0;
1025 return AVERROR_INVALIDDATA;
1026 }
1027 asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
1028
1029 for (i = 0; i < asfst->payload_ext_ct; i++) {
1030 ASFPayload *p = &asfst->payload[i];
1031 int size = p->size;
1032 int64_t payend;
1033 if (size == 0xFFFF)
1034 size = avio_rl16(pb);
1035 payend = avio_tell(pb) + size;
1036 if (payend > end) {
1037 av_log(s, AV_LOG_ERROR, "too long payload\n");
1038 break;
1039 }
1040 switch (p->type) {
1041 case 0x50:
1042 // duration = avio_rl16(pb);
1043 break;
1044 case 0x54:
1045 aspect.num = avio_r8(pb);
1046 aspect.den = avio_r8(pb);
1047 if (aspect.num > 0 && aspect.den > 0 && asf->stream_index >= 0) {
1048 s->streams[asf->stream_index]->sample_aspect_ratio = aspect;
1049 }
1050 break;
1051 case 0x2A:
1052 avio_skip(pb, 8);
1053 ts0 = avio_rl64(pb);
1054 ts1 = avio_rl64(pb);
1055 if (ts0!= -1) asf->packet_frag_timestamp = ts0/10000;
1056 else asf->packet_frag_timestamp = AV_NOPTS_VALUE;
1057 asf->ts_is_pts = 1;
1058 break;
1059 case 0x5B:
1060 case 0xB7:
1061 case 0xCC:
1062 case 0xC0:
1063 case 0xA0:
1064 //unknown
1065 break;
1066 }
1067 avio_seek(pb, payend, SEEK_SET);
1068 }
1069
1070 avio_seek(pb, end, SEEK_SET);
1071 rsize += asf->packet_replic_size; // FIXME - check validity
1072 } else if (asf->packet_replic_size == 1) {
1073 // multipacket - frag_offset is beginning timestamp
1074 asf->packet_time_start = asf->packet_frag_offset;
1075 asf->packet_frag_offset = 0;
1076 asf->packet_frag_timestamp = asf->packet_timestamp;
1077
1078 asf->packet_time_delta = avio_r8(pb);
1079 rsize++;
1080 } else if (asf->packet_replic_size != 0) {
1081 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
1082 asf->packet_replic_size);
1083 return AVERROR_INVALIDDATA;
1084 }
1085 if (asf->packet_flags & 0x01) {
1086 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
1087 if (rsize > asf->packet_size_left) {
1088 av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
1089 return AVERROR_INVALIDDATA;
1090 } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
1091 if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
1092 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n",
1093 asf->packet_size_left, rsize);
1094 return AVERROR_INVALIDDATA;
1095 } else {
1096 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
1097 asf->packet_size_left += diff;
1098 asf->packet_padsize -= diff;
1099 }
1100 }
1101 } else {
1102 asf->packet_frag_size = asf->packet_size_left - rsize;
1103 }
1104 if (asf->packet_replic_size == 1) {
1105 asf->packet_multi_size = asf->packet_frag_size;
1106 if (asf->packet_multi_size > asf->packet_size_left)
1107 return AVERROR_INVALIDDATA;
1108 }
1109 asf->packet_size_left -= rsize;
1110
1111 return 0;
1112 }
1113
1114 /**
1115 * Parse data from individual ASF packets (which were previously loaded
1116 * with asf_get_packet()).
1117 * @param s demux context
1118 * @param pb context to read data from
1119 * @param pkt pointer to store packet data into
1120 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
1121 * packets need to be loaded (through asf_get_packet())
1122 */
asf_parse_packet(AVFormatContext * s,AVIOContext * pb,AVPacket * pkt)1123 static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
1124 {
1125 ASFContext *asf = s->priv_data;
1126 ASFStream *asf_st = 0;
1127 for (;;) {
1128 int ret;
1129 if (avio_feof(pb))
1130 return AVERROR_EOF;
1131 if (asf->packet_size_left < FRAME_HEADER_SIZE ||
1132 asf->packet_segments < 1 && asf->packet_time_start == 0) {
1133 int ret = asf->packet_size_left + asf->packet_padsize;
1134
1135 assert(ret >= 0);
1136 /* fail safe */
1137 avio_skip(pb, ret);
1138
1139 asf->packet_pos = avio_tell(pb);
1140 if (asf->data_object_size != (uint64_t)-1 &&
1141 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
1142 return AVERROR_EOF; /* Do not exceed the size of the data object */
1143 return 1;
1144 }
1145 if (asf->packet_time_start == 0) {
1146 if (asf_read_frame_header(s, pb) < 0) {
1147 asf->packet_time_start = asf->packet_segments = 0;
1148 continue;
1149 }
1150 if (asf->stream_index < 0 ||
1151 s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
1152 (!asf->packet_key_frame &&
1153 (s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY || asf->streams[s->streams[asf->stream_index]->id].skip_to_key))) {
1154 asf->packet_time_start = 0;
1155 /* unhandled packet (should not happen) */
1156 avio_skip(pb, asf->packet_frag_size);
1157 asf->packet_size_left -= asf->packet_frag_size;
1158 if (asf->stream_index < 0)
1159 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
1160 asf->packet_frag_size);
1161 continue;
1162 }
1163 asf->asf_st = &asf->streams[s->streams[asf->stream_index]->id];
1164 asf->asf_st->skip_to_key = 0;
1165 }
1166 asf_st = asf->asf_st;
1167 av_assert0(asf_st);
1168
1169 if (!asf_st->frag_offset && asf->packet_frag_offset) {
1170 av_dlog(s, "skipping asf data pkt with fragment offset for "
1171 "stream:%d, expected:%d but got %d from pkt)\n",
1172 asf->stream_index, asf_st->frag_offset,
1173 asf->packet_frag_offset);
1174 avio_skip(pb, asf->packet_frag_size);
1175 asf->packet_size_left -= asf->packet_frag_size;
1176 continue;
1177 }
1178
1179 if (asf->packet_replic_size == 1) {
1180 // frag_offset is here used as the beginning timestamp
1181 asf->packet_frag_timestamp = asf->packet_time_start;
1182 asf->packet_time_start += asf->packet_time_delta;
1183 asf_st->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
1184 asf->packet_size_left--;
1185 asf->packet_multi_size--;
1186 if (asf->packet_multi_size < asf_st->packet_obj_size) {
1187 asf->packet_time_start = 0;
1188 avio_skip(pb, asf->packet_multi_size);
1189 asf->packet_size_left -= asf->packet_multi_size;
1190 continue;
1191 }
1192 asf->packet_multi_size -= asf_st->packet_obj_size;
1193 }
1194
1195 if (asf_st->pkt.size != asf_st->packet_obj_size ||
1196 // FIXME is this condition sufficient?
1197 asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
1198 int ret;
1199
1200 if (asf_st->pkt.data) {
1201 av_log(s, AV_LOG_INFO,
1202 "freeing incomplete packet size %d, new %d\n",
1203 asf_st->pkt.size, asf_st->packet_obj_size);
1204 asf_st->frag_offset = 0;
1205 av_free_packet(&asf_st->pkt);
1206 }
1207 /* new packet */
1208 if ((ret = av_new_packet(&asf_st->pkt, asf_st->packet_obj_size)) < 0)
1209 return ret;
1210 asf_st->seq = asf->packet_seq;
1211 if (asf->ts_is_pts) {
1212 asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;
1213 } else
1214 asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
1215 asf_st->pkt.stream_index = asf->stream_index;
1216 asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos;
1217 asf_st->pkt_clean = 0;
1218
1219 if (asf_st->pkt.data && asf_st->palette_changed) {
1220 uint8_t *pal;
1221 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
1222 AVPALETTE_SIZE);
1223 if (!pal) {
1224 av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
1225 } else {
1226 memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
1227 asf_st->palette_changed = 0;
1228 }
1229 }
1230 av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
1231 asf->stream_index, asf->packet_key_frame,
1232 asf_st->pkt.flags & AV_PKT_FLAG_KEY,
1233 s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO,
1234 asf_st->packet_obj_size);
1235 if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
1236 asf->packet_key_frame = 1;
1237 if (asf->packet_key_frame)
1238 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
1239 }
1240
1241 /* read data */
1242 av_dlog(asf, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
1243 s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
1244 asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
1245 asf->packet_size_left -= asf->packet_frag_size;
1246 if (asf->packet_size_left < 0)
1247 continue;
1248
1249 if (asf->packet_frag_offset >= asf_st->pkt.size ||
1250 asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
1251 av_log(s, AV_LOG_ERROR,
1252 "packet fragment position invalid %u,%u not in %u\n",
1253 asf->packet_frag_offset, asf->packet_frag_size,
1254 asf_st->pkt.size);
1255 continue;
1256 }
1257
1258 if (asf->packet_frag_offset != asf_st->frag_offset && !asf_st->pkt_clean) {
1259 memset(asf_st->pkt.data + asf_st->frag_offset, 0, asf_st->pkt.size - asf_st->frag_offset);
1260 asf_st->pkt_clean = 1;
1261 }
1262
1263 ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
1264 asf->packet_frag_size);
1265 if (ret != asf->packet_frag_size) {
1266 if (ret < 0 || asf->packet_frag_offset + ret == 0)
1267 return ret < 0 ? ret : AVERROR_EOF;
1268
1269 if (asf_st->ds_span > 1) {
1270 // scrambling, we can either drop it completely or fill the remainder
1271 // TODO: should we fill the whole packet instead of just the current
1272 // fragment?
1273 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
1274 asf->packet_frag_size - ret);
1275 ret = asf->packet_frag_size;
1276 } else {
1277 // no scrambling, so we can return partial packets
1278 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
1279 }
1280 }
1281 if (s->key && s->keylen == 20)
1282 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
1283 ret);
1284 asf_st->frag_offset += ret;
1285 /* test if whole packet is read */
1286 if (asf_st->frag_offset == asf_st->pkt.size) {
1287 // workaround for macroshit radio DVR-MS files
1288 if (s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
1289 asf_st->pkt.size > 100) {
1290 int i;
1291 for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
1292 ;
1293 if (i == asf_st->pkt.size) {
1294 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
1295 asf_st->frag_offset = 0;
1296 av_free_packet(&asf_st->pkt);
1297 continue;
1298 }
1299 }
1300
1301 /* return packet */
1302 if (asf_st->ds_span > 1) {
1303 if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
1304 av_log(s, AV_LOG_ERROR,
1305 "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
1306 asf_st->pkt.size, asf_st->ds_packet_size,
1307 asf_st->ds_span);
1308 } else {
1309 /* packet descrambling */
1310 AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
1311 FF_INPUT_BUFFER_PADDING_SIZE);
1312 if (buf) {
1313 uint8_t *newdata = buf->data;
1314 int offset = 0;
1315 memset(newdata + asf_st->pkt.size, 0,
1316 FF_INPUT_BUFFER_PADDING_SIZE);
1317 while (offset < asf_st->pkt.size) {
1318 int off = offset / asf_st->ds_chunk_size;
1319 int row = off / asf_st->ds_span;
1320 int col = off % asf_st->ds_span;
1321 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
1322 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
1323 assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
1324 memcpy(newdata + offset,
1325 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
1326 asf_st->ds_chunk_size);
1327 offset += asf_st->ds_chunk_size;
1328 }
1329 av_buffer_unref(&asf_st->pkt.buf);
1330 asf_st->pkt.buf = buf;
1331 asf_st->pkt.data = buf->data;
1332 }
1333 }
1334 }
1335 asf_st->frag_offset = 0;
1336 *pkt = asf_st->pkt;
1337 #if FF_API_DESTRUCT_PACKET
1338 FF_DISABLE_DEPRECATION_WARNINGS
1339 asf_st->pkt.destruct = NULL;
1340 FF_ENABLE_DEPRECATION_WARNINGS
1341 #endif
1342 asf_st->pkt.buf = 0;
1343 asf_st->pkt.size = 0;
1344 asf_st->pkt.data = 0;
1345 asf_st->pkt.side_data_elems = 0;
1346 asf_st->pkt.side_data = NULL;
1347 break; // packet completed
1348 }
1349 }
1350 return 0;
1351 }
1352
asf_read_packet(AVFormatContext * s,AVPacket * pkt)1353 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1354 {
1355 ASFContext *asf = s->priv_data;
1356
1357 for (;;) {
1358 int ret;
1359
1360 /* parse cached packets, if any */
1361 if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
1362 return ret;
1363 if ((ret = asf_get_packet(s, s->pb)) < 0)
1364 assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
1365 asf->packet_segments < 1);
1366 asf->packet_time_start = 0;
1367 }
1368 }
1369
1370 // Added to support seeking after packets have been read
1371 // If information is not reset, read_packet fails due to
1372 // leftover information from previous reads
asf_reset_header(AVFormatContext * s)1373 static void asf_reset_header(AVFormatContext *s)
1374 {
1375 ASFContext *asf = s->priv_data;
1376 ASFStream *asf_st;
1377 int i;
1378
1379 asf->packet_size_left = 0;
1380 asf->packet_flags = 0;
1381 asf->packet_property = 0;
1382 asf->packet_timestamp = 0;
1383 asf->packet_segsizetype = 0;
1384 asf->packet_segments = 0;
1385 asf->packet_seq = 0;
1386 asf->packet_replic_size = 0;
1387 asf->packet_key_frame = 0;
1388 asf->packet_padsize = 0;
1389 asf->packet_frag_offset = 0;
1390 asf->packet_frag_size = 0;
1391 asf->packet_frag_timestamp = 0;
1392 asf->packet_multi_size = 0;
1393 asf->packet_time_delta = 0;
1394 asf->packet_time_start = 0;
1395
1396 for (i = 0; i < 128; i++) {
1397 asf_st = &asf->streams[i];
1398 av_free_packet(&asf_st->pkt);
1399 asf_st->packet_obj_size = 0;
1400 asf_st->frag_offset = 0;
1401 asf_st->seq = 0;
1402 }
1403 asf->asf_st = NULL;
1404 }
1405
skip_to_key(AVFormatContext * s)1406 static void skip_to_key(AVFormatContext *s)
1407 {
1408 ASFContext *asf = s->priv_data;
1409 int i;
1410
1411 for (i = 0; i < 128; i++) {
1412 int j = asf->asfid2avid[i];
1413 ASFStream *asf_st = &asf->streams[i];
1414 if (j < 0 || s->streams[j]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
1415 continue;
1416
1417 asf_st->skip_to_key = 1;
1418 }
1419 }
1420
asf_read_close(AVFormatContext * s)1421 static int asf_read_close(AVFormatContext *s)
1422 {
1423 asf_reset_header(s);
1424
1425 return 0;
1426 }
1427
asf_read_pts(AVFormatContext * s,int stream_index,int64_t * ppos,int64_t pos_limit)1428 static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
1429 int64_t *ppos, int64_t pos_limit)
1430 {
1431 ASFContext *asf = s->priv_data;
1432 AVPacket pkt1, *pkt = &pkt1;
1433 ASFStream *asf_st;
1434 int64_t pts;
1435 int64_t pos = *ppos;
1436 int i;
1437 int64_t start_pos[ASF_MAX_STREAMS];
1438
1439 for (i = 0; i < s->nb_streams; i++)
1440 start_pos[i] = pos;
1441
1442 if (s->packet_size > 0)
1443 pos = (pos + s->packet_size - 1 - s->data_offset) /
1444 s->packet_size * s->packet_size +
1445 s->data_offset;
1446 *ppos = pos;
1447 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
1448 return AV_NOPTS_VALUE;
1449
1450 ff_read_frame_flush(s);
1451 asf_reset_header(s);
1452 for (;;) {
1453 if (av_read_frame(s, pkt) < 0) {
1454 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1455 return AV_NOPTS_VALUE;
1456 }
1457
1458 pts = pkt->dts;
1459
1460 av_free_packet(pkt);
1461 if (pkt->flags & AV_PKT_FLAG_KEY) {
1462 i = pkt->stream_index;
1463
1464 asf_st = &asf->streams[s->streams[i]->id];
1465
1466 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1467 pos = asf_st->packet_pos;
1468
1469 av_add_index_entry(s->streams[i], pos, pts, pkt->size,
1470 pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1471 start_pos[i] = asf_st->packet_pos + 1;
1472
1473 if (pkt->stream_index == stream_index)
1474 break;
1475 }
1476 }
1477
1478 *ppos = pos;
1479 return pts;
1480 }
1481
asf_build_simple_index(AVFormatContext * s,int stream_index)1482 static int asf_build_simple_index(AVFormatContext *s, int stream_index)
1483 {
1484 ff_asf_guid g;
1485 ASFContext *asf = s->priv_data;
1486 int64_t current_pos = avio_tell(s->pb);
1487 int ret = 0;
1488
1489 if((ret = avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET)) < 0) {
1490 return ret;
1491 }
1492
1493 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1494 goto end;
1495
1496 /* the data object can be followed by other top-level objects,
1497 * skip them until the simple index object is reached */
1498 while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {
1499 int64_t gsize = avio_rl64(s->pb);
1500 if (gsize < 24 || avio_feof(s->pb)) {
1501 goto end;
1502 }
1503 avio_skip(s->pb, gsize - 24);
1504 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1505 goto end;
1506 }
1507
1508 {
1509 int64_t itime, last_pos = -1;
1510 int pct, ict;
1511 int i;
1512 int64_t av_unused gsize = avio_rl64(s->pb);
1513 if ((ret = ff_get_guid(s->pb, &g)) < 0)
1514 goto end;
1515 itime = avio_rl64(s->pb);
1516 pct = avio_rl32(s->pb);
1517 ict = avio_rl32(s->pb);
1518 av_log(s, AV_LOG_DEBUG,
1519 "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
1520
1521 for (i = 0; i < ict; i++) {
1522 int pktnum = avio_rl32(s->pb);
1523 int pktct = avio_rl16(s->pb);
1524 int64_t pos = s->data_offset + s->packet_size * (int64_t)pktnum;
1525 int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
1526
1527 if (pos != last_pos) {
1528 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
1529 pktnum, pktct, index_pts);
1530 av_add_index_entry(s->streams[stream_index], pos, index_pts,
1531 s->packet_size, 0, AVINDEX_KEYFRAME);
1532 last_pos = pos;
1533 }
1534 }
1535 asf->index_read = ict > 1;
1536 }
1537 end:
1538 // if (avio_feof(s->pb)) {
1539 // ret = 0;
1540 // }
1541 avio_seek(s->pb, current_pos, SEEK_SET);
1542 return ret;
1543 }
1544
asf_read_seek(AVFormatContext * s,int stream_index,int64_t pts,int flags)1545 static int asf_read_seek(AVFormatContext *s, int stream_index,
1546 int64_t pts, int flags)
1547 {
1548 ASFContext *asf = s->priv_data;
1549 AVStream *st = s->streams[stream_index];
1550 int ret = 0;
1551
1552 if (s->packet_size <= 0)
1553 return -1;
1554
1555 /* Try using the protocol's read_seek if available */
1556 if (s->pb) {
1557 int ret = avio_seek_time(s->pb, stream_index, pts, flags);
1558 if (ret >= 0)
1559 asf_reset_header(s);
1560 if (ret != AVERROR(ENOSYS))
1561 return ret;
1562 }
1563
1564 /* explicitly handle the case of seeking to 0 */
1565 if (!pts) {
1566 asf_reset_header(s);
1567 avio_seek(s->pb, s->data_offset, SEEK_SET);
1568 return 0;
1569 }
1570
1571 if (!asf->index_read) {
1572 ret = asf_build_simple_index(s, stream_index);
1573 if (ret < 0)
1574 asf->index_read = -1;
1575 }
1576
1577 if (asf->index_read > 0 && st->index_entries) {
1578 int index = av_index_search_timestamp(st, pts, flags);
1579 if (index >= 0) {
1580 /* find the position */
1581 uint64_t pos = st->index_entries[index].pos;
1582
1583 /* do the seek */
1584 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1585 if(avio_seek(s->pb, pos, SEEK_SET) < 0)
1586 return -1;
1587 asf_reset_header(s);
1588 skip_to_key(s);
1589 return 0;
1590 }
1591 }
1592 /* no index or seeking by index failed */
1593 if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
1594 return -1;
1595 asf_reset_header(s);
1596 skip_to_key(s);
1597 return 0;
1598 }
1599
1600 AVInputFormat ff_asf_demuxer = {
1601 .name = "asf",
1602 .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1603 .priv_data_size = sizeof(ASFContext),
1604 .read_probe = asf_probe,
1605 .read_header = asf_read_header,
1606 .read_packet = asf_read_packet,
1607 .read_close = asf_read_close,
1608 .read_seek = asf_read_seek,
1609 .read_timestamp = asf_read_pts,
1610 .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
1611 .priv_class = &asf_class,
1612 };
1613