Favor chunk size over hitting the correct position after reading the chunk size in...
[libav.git] / libavformat / asfdec.c
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 //#define DEBUG
23
24 #include "libavutil/common.h"
25 #include "libavutil/avstring.h"
26 #include "libavcodec/mpegaudio.h"
27 #include "avformat.h"
28 #include "riff.h"
29 #include "asf.h"
30 #include "asfcrypt.h"
31 #include "avlanguage.h"
32
33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
34
35 #undef NDEBUG
36 #include <assert.h>
37
38 #define FRAME_HEADER_SIZE 17
39 // Fix Me! FRAME_HEADER_SIZE may be different.
40
41 static const ff_asf_guid index_guid = {
42 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
43 };
44
45 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
46 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
47 };
48 /**********************************/
49 /* decoding */
50
51 static int guidcmp(const void *g1, const void *g2)
52 {
53 return memcmp(g1, g2, sizeof(ff_asf_guid));
54 }
55
56 #ifdef DEBUG
57 #define PRINT_IF_GUID(g,cmp) \
58 if (!guidcmp(g, &cmp)) \
59 dprintf(NULL, "(GUID: %s) ", #cmp)
60
61 static void print_guid(const ff_asf_guid *g)
62 {
63 int i;
64 PRINT_IF_GUID(g, ff_asf_header);
65 else PRINT_IF_GUID(g, ff_asf_file_header);
66 else PRINT_IF_GUID(g, ff_asf_stream_header);
67 else PRINT_IF_GUID(g, ff_asf_audio_stream);
68 else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
69 else PRINT_IF_GUID(g, ff_asf_video_stream);
70 else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
71 else PRINT_IF_GUID(g, ff_asf_command_stream);
72 else PRINT_IF_GUID(g, ff_asf_comment_header);
73 else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
74 else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
75 else PRINT_IF_GUID(g, ff_asf_data_header);
76 else PRINT_IF_GUID(g, index_guid);
77 else PRINT_IF_GUID(g, ff_asf_head1_guid);
78 else PRINT_IF_GUID(g, ff_asf_head2_guid);
79 else PRINT_IF_GUID(g, ff_asf_my_guid);
80 else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
81 else PRINT_IF_GUID(g, ff_asf_extended_content_header);
82 else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
83 else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
84 else PRINT_IF_GUID(g, ff_asf_metadata_header);
85 else PRINT_IF_GUID(g, ff_asf_marker_header);
86 else PRINT_IF_GUID(g, stream_bitrate_guid);
87 else PRINT_IF_GUID(g, ff_asf_language_guid);
88 else
89 dprintf(NULL, "(GUID: unknown) ");
90 for(i=0;i<16;i++)
91 dprintf(NULL, " 0x%02x,", (*g)[i]);
92 dprintf(NULL, "}\n");
93 }
94 #undef PRINT_IF_GUID
95 #else
96 #define print_guid(g)
97 #endif
98
99 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
100 {
101 assert(sizeof(*g) == 16);
102 get_buffer(s, *g, sizeof(*g));
103 }
104
105 #if 0
106 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
107 {
108 int len, c;
109 char *q;
110
111 len = get_le16(pb);
112 q = buf;
113 while (len > 0) {
114 c = get_le16(pb);
115 if ((q - buf) < buf_size - 1)
116 *q++ = c;
117 len--;
118 }
119 *q = '\0';
120 }
121 #endif
122
123 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
124 {
125 char* q = buf;
126 while (len > 1) {
127 uint8_t tmp;
128 uint32_t ch;
129
130 GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
131 PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
132 }
133 if (len > 0)
134 url_fskip(pb, len);
135 *q = '\0';
136 }
137
138 static int asf_probe(AVProbeData *pd)
139 {
140 /* check file header */
141 if (!guidcmp(pd->buf, &ff_asf_header))
142 return AVPROBE_SCORE_MAX;
143 else
144 return 0;
145 }
146
147 static int get_value(ByteIOContext *pb, int type){
148 switch(type){
149 case 2: return get_le32(pb);
150 case 3: return get_le32(pb);
151 case 4: return get_le64(pb);
152 case 5: return get_le16(pb);
153 default:return INT_MIN;
154 }
155 }
156
157 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
158 {
159 char *value;
160
161 if ((unsigned)len >= (UINT_MAX - 1)/2)
162 return;
163
164 value = av_malloc(2*len+1);
165 if (!value)
166 return;
167
168 if (type == 0) { // UTF16-LE
169 get_str16_nolen(s->pb, len, value, 2*len + 1);
170 } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
171 uint64_t num = get_value(s->pb, type);
172 snprintf(value, len, "%"PRIu64, num);
173 } else {
174 url_fskip(s->pb, len);
175 av_freep(&value);
176 av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
177 return;
178 }
179 av_metadata_set2(&s->metadata, key, value, 0);
180 av_freep(&value);
181 }
182
183 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
184 {
185 ASFContext *asf = s->priv_data;
186 ff_asf_guid g;
187 ByteIOContext *pb = s->pb;
188 AVStream *st;
189 ASFStream *asf_st;
190 int size, i;
191 int64_t gsize;
192 AVRational dar[128];
193 uint32_t bitrate[128];
194
195 memset(dar, 0, sizeof(dar));
196 memset(bitrate, 0, sizeof(bitrate));
197
198 get_guid(pb, &g);
199 if (guidcmp(&g, &ff_asf_header))
200 return -1;
201 get_le64(pb);
202 get_le32(pb);
203 get_byte(pb);
204 get_byte(pb);
205 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
206 for(;;) {
207 uint64_t gpos= url_ftell(pb);
208 get_guid(pb, &g);
209 gsize = get_le64(pb);
210 dprintf(s, "%08"PRIx64": ", gpos);
211 print_guid(&g);
212 dprintf(s, " size=0x%"PRIx64"\n", gsize);
213 if (!guidcmp(&g, &ff_asf_data_header)) {
214 asf->data_object_offset = url_ftell(pb);
215 // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
216 if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
217 asf->data_object_size = gsize - 24;
218 } else {
219 asf->data_object_size = (uint64_t)-1;
220 }
221 break;
222 }
223 if (gsize < 24)
224 return -1;
225 if (!guidcmp(&g, &ff_asf_file_header)) {
226 get_guid(pb, &asf->hdr.guid);
227 asf->hdr.file_size = get_le64(pb);
228 asf->hdr.create_time = get_le64(pb);
229 asf->nb_packets = get_le64(pb);
230 asf->hdr.play_time = get_le64(pb);
231 asf->hdr.send_time = get_le64(pb);
232 asf->hdr.preroll = get_le32(pb);
233 asf->hdr.ignore = get_le32(pb);
234 asf->hdr.flags = get_le32(pb);
235 asf->hdr.min_pktsize = get_le32(pb);
236 asf->hdr.max_pktsize = get_le32(pb);
237 asf->hdr.max_bitrate = get_le32(pb);
238 s->packet_size = asf->hdr.max_pktsize;
239 } else if (!guidcmp(&g, &ff_asf_stream_header)) {
240 enum AVMediaType type;
241 int type_specific_size, sizeX;
242 uint64_t total_size;
243 unsigned int tag1;
244 int64_t pos1, pos2, start_time;
245 int test_for_ext_stream_audio, is_dvr_ms_audio=0;
246
247 pos1 = url_ftell(pb);
248
249 st = av_new_stream(s, 0);
250 if (!st)
251 return AVERROR(ENOMEM);
252 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
253 asf_st = av_mallocz(sizeof(ASFStream));
254 if (!asf_st)
255 return AVERROR(ENOMEM);
256 st->priv_data = asf_st;
257 start_time = asf->hdr.preroll;
258
259 asf_st->stream_language_index = 128; // invalid stream index means no language info
260
261 if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
262 st->duration = asf->hdr.play_time /
263 (10000000 / 1000) - start_time;
264 }
265 get_guid(pb, &g);
266
267 test_for_ext_stream_audio = 0;
268 if (!guidcmp(&g, &ff_asf_audio_stream)) {
269 type = AVMEDIA_TYPE_AUDIO;
270 } else if (!guidcmp(&g, &ff_asf_video_stream)) {
271 type = AVMEDIA_TYPE_VIDEO;
272 } else if (!guidcmp(&g, &ff_asf_command_stream)) {
273 type = AVMEDIA_TYPE_DATA;
274 } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
275 test_for_ext_stream_audio = 1;
276 type = AVMEDIA_TYPE_UNKNOWN;
277 } else {
278 return -1;
279 }
280 get_guid(pb, &g);
281 total_size = get_le64(pb);
282 type_specific_size = get_le32(pb);
283 get_le32(pb);
284 st->id = get_le16(pb) & 0x7f; /* stream id */
285 // mapping of asf ID to AV stream ID;
286 asf->asfid2avid[st->id] = s->nb_streams - 1;
287
288 get_le32(pb);
289
290 if (test_for_ext_stream_audio) {
291 get_guid(pb, &g);
292 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
293 type = AVMEDIA_TYPE_AUDIO;
294 is_dvr_ms_audio=1;
295 get_guid(pb, &g);
296 get_le32(pb);
297 get_le32(pb);
298 get_le32(pb);
299 get_guid(pb, &g);
300 get_le32(pb);
301 }
302 }
303
304 st->codec->codec_type = type;
305 if (type == AVMEDIA_TYPE_AUDIO) {
306 ff_get_wav_header(pb, st->codec, type_specific_size);
307 if (is_dvr_ms_audio) {
308 // codec_id and codec_tag are unreliable in dvr_ms
309 // files. Set them later by probing stream.
310 st->codec->codec_id = CODEC_ID_PROBE;
311 st->codec->codec_tag = 0;
312 }
313 if (st->codec->codec_id == CODEC_ID_AAC) {
314 st->need_parsing = AVSTREAM_PARSE_NONE;
315 } else {
316 st->need_parsing = AVSTREAM_PARSE_FULL;
317 }
318 /* We have to init the frame size at some point .... */
319 pos2 = url_ftell(pb);
320 if (gsize >= (pos2 + 8 - pos1 + 24)) {
321 asf_st->ds_span = get_byte(pb);
322 asf_st->ds_packet_size = get_le16(pb);
323 asf_st->ds_chunk_size = get_le16(pb);
324 get_le16(pb); //ds_data_size
325 get_byte(pb); //ds_silence_data
326 }
327 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
328 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
329 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
330 if (asf_st->ds_span > 1) {
331 if (!asf_st->ds_chunk_size
332 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
333 || asf_st->ds_packet_size % asf_st->ds_chunk_size)
334 asf_st->ds_span = 0; // disable descrambling
335 }
336 switch (st->codec->codec_id) {
337 case CODEC_ID_MP3:
338 st->codec->frame_size = MPA_FRAME_SIZE;
339 break;
340 case CODEC_ID_PCM_S16LE:
341 case CODEC_ID_PCM_S16BE:
342 case CODEC_ID_PCM_U16LE:
343 case CODEC_ID_PCM_U16BE:
344 case CODEC_ID_PCM_S8:
345 case CODEC_ID_PCM_U8:
346 case CODEC_ID_PCM_ALAW:
347 case CODEC_ID_PCM_MULAW:
348 st->codec->frame_size = 1;
349 break;
350 default:
351 /* This is probably wrong, but it prevents a crash later */
352 st->codec->frame_size = 1;
353 break;
354 }
355 } else if (type == AVMEDIA_TYPE_VIDEO) {
356 get_le32(pb);
357 get_le32(pb);
358 get_byte(pb);
359 size = get_le16(pb); /* size */
360 sizeX= get_le32(pb); /* size */
361 st->codec->width = get_le32(pb);
362 st->codec->height = get_le32(pb);
363 /* not available for asf */
364 get_le16(pb); /* panes */
365 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
366 tag1 = get_le32(pb);
367 url_fskip(pb, 20);
368 // av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
369 size= sizeX;
370 if (size > 40) {
371 st->codec->extradata_size = size - 40;
372 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
373 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
374 }
375
376 /* Extract palette from extradata if bpp <= 8 */
377 /* This code assumes that extradata contains only palette */
378 /* This is true for all paletted codecs implemented in ffmpeg */
379 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
380 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
381 #if HAVE_BIGENDIAN
382 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
383 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
384 #else
385 memcpy(st->codec->palctrl->palette, st->codec->extradata,
386 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
387 #endif
388 st->codec->palctrl->palette_changed = 1;
389 }
390
391 st->codec->codec_tag = tag1;
392 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
393 if(tag1 == MKTAG('D', 'V', 'R', ' '))
394 st->need_parsing = AVSTREAM_PARSE_FULL;
395 }
396 pos2 = url_ftell(pb);
397 url_fskip(pb, gsize - (pos2 - pos1 + 24));
398 } else if (!guidcmp(&g, &ff_asf_comment_header)) {
399 int len1, len2, len3, len4, len5;
400
401 len1 = get_le16(pb);
402 len2 = get_le16(pb);
403 len3 = get_le16(pb);
404 len4 = get_le16(pb);
405 len5 = get_le16(pb);
406 get_tag(s, "title" , 0, len1);
407 get_tag(s, "author" , 0, len2);
408 get_tag(s, "copyright", 0, len3);
409 get_tag(s, "comment" , 0, len4);
410 url_fskip(pb, len5);
411 } else if (!guidcmp(&g, &stream_bitrate_guid)) {
412 int stream_count = get_le16(pb);
413 int j;
414
415 // av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
416 // av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
417 for(j = 0; j < stream_count; j++) {
418 int flags, bitrate, stream_id;
419
420 flags= get_le16(pb);
421 bitrate= get_le32(pb);
422 stream_id= (flags & 0x7f);
423 // av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
424 asf->stream_bitrates[stream_id]= bitrate;
425 }
426 } else if (!guidcmp(&g, &ff_asf_language_guid)) {
427 int j;
428 int stream_count = get_le16(pb);
429 for(j = 0; j < stream_count; j++) {
430 char lang[6];
431 unsigned int lang_len = get_byte(pb);
432 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
433 if (j < 128)
434 av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
435 }
436 } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
437 int desc_count, i;
438
439 desc_count = get_le16(pb);
440 for(i=0;i<desc_count;i++) {
441 int name_len,value_type,value_len;
442 char name[1024];
443
444 name_len = get_le16(pb);
445 if (name_len%2) // must be even, broken lavf versions wrote len-1
446 name_len += 1;
447 get_str16_nolen(pb, name_len, name, sizeof(name));
448 value_type = get_le16(pb);
449 value_len = get_le16(pb);
450 if (!value_type && value_len%2)
451 value_len += 1;
452 get_tag(s, name, value_type, value_len);
453 }
454 } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
455 int n, stream_num, name_len, value_len, value_type, value_num;
456 n = get_le16(pb);
457
458 for(i=0;i<n;i++) {
459 char name[1024];
460
461 get_le16(pb); //lang_list_index
462 stream_num= get_le16(pb);
463 name_len= get_le16(pb);
464 value_type= get_le16(pb);
465 value_len= get_le32(pb);
466
467 get_str16_nolen(pb, name_len, name, sizeof(name));
468 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
469 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
470 url_fskip(pb, value_len - 2);
471
472 if(stream_num<128){
473 if (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
474 else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
475 }
476 }
477 } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
478 int ext_len, payload_ext_ct, stream_ct;
479 uint32_t ext_d, leak_rate, stream_num;
480 unsigned int stream_languageid_index;
481
482 get_le64(pb); // starttime
483 get_le64(pb); // endtime
484 leak_rate = get_le32(pb); // leak-datarate
485 get_le32(pb); // bucket-datasize
486 get_le32(pb); // init-bucket-fullness
487 get_le32(pb); // alt-leak-datarate
488 get_le32(pb); // alt-bucket-datasize
489 get_le32(pb); // alt-init-bucket-fullness
490 get_le32(pb); // max-object-size
491 get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
492 stream_num = get_le16(pb); // stream-num
493
494 stream_languageid_index = get_le16(pb); // stream-language-id-index
495 if (stream_num < 128)
496 asf->streams[stream_num].stream_language_index = stream_languageid_index;
497
498 get_le64(pb); // avg frametime in 100ns units
499 stream_ct = get_le16(pb); //stream-name-count
500 payload_ext_ct = get_le16(pb); //payload-extension-system-count
501
502 if (stream_num < 128)
503 bitrate[stream_num] = leak_rate;
504
505 for (i=0; i<stream_ct; i++){
506 get_le16(pb);
507 ext_len = get_le16(pb);
508 url_fseek(pb, ext_len, SEEK_CUR);
509 }
510
511 for (i=0; i<payload_ext_ct; i++){
512 get_guid(pb, &g);
513 ext_d=get_le16(pb);
514 ext_len=get_le32(pb);
515 url_fseek(pb, ext_len, SEEK_CUR);
516 }
517
518 // there could be a optional stream properties object to follow
519 // if so the next iteration will pick it up
520 } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
521 int v1, v2;
522 get_guid(pb, &g);
523 v1 = get_le32(pb);
524 v2 = get_le16(pb);
525 } else if (!guidcmp(&g, &ff_asf_marker_header)) {
526 int i, count, name_len;
527 char name[1024];
528
529 get_le64(pb); // reserved 16 bytes
530 get_le64(pb); // ...
531 count = get_le32(pb); // markers count
532 get_le16(pb); // reserved 2 bytes
533 name_len = get_le16(pb); // name length
534 for(i=0;i<name_len;i++){
535 get_byte(pb); // skip the name
536 }
537
538 for(i=0;i<count;i++){
539 int64_t pres_time;
540 int name_len;
541
542 get_le64(pb); // offset, 8 bytes
543 pres_time = get_le64(pb); // presentation time
544 get_le16(pb); // entry length
545 get_le32(pb); // send time
546 get_le32(pb); // flags
547 name_len = get_le32(pb); // name length
548 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
549 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
550 }
551 #if 0
552 } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
553 int len, v1, n, num;
554 char str[256], *q;
555 char tag[16];
556
557 get_guid(pb, &g);
558 print_guid(&g);
559
560 n = get_le32(pb);
561 for(i=0;i<n;i++) {
562 num = get_le16(pb); /* stream number */
563 get_str16(pb, str, sizeof(str));
564 get_str16(pb, str, sizeof(str));
565 len = get_le16(pb);
566 q = tag;
567 while (len > 0) {
568 v1 = get_byte(pb);
569 if ((q - tag) < sizeof(tag) - 1)
570 *q++ = v1;
571 len--;
572 }
573 *q = '\0';
574 }
575 #endif
576 } else if (url_feof(pb)) {
577 return -1;
578 } else {
579 if (!s->keylen) {
580 if (!guidcmp(&g, &ff_asf_content_encryption)) {
581 av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
582 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
583 av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
584 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
585 av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
586 }
587 }
588 }
589 if(url_ftell(pb) != gpos + gsize)
590 av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
591 url_fseek(pb, gpos + gsize, SEEK_SET);
592 }
593 get_guid(pb, &g);
594 get_le64(pb);
595 get_byte(pb);
596 get_byte(pb);
597 if (url_feof(pb))
598 return -1;
599 asf->data_offset = url_ftell(pb);
600 asf->packet_size_left = 0;
601
602
603 for(i=0; i<128; i++){
604 int stream_num= asf->asfid2avid[i];
605 if(stream_num>=0){
606 AVStream *st = s->streams[stream_num];
607 if (!st->codec->bit_rate)
608 st->codec->bit_rate = bitrate[i];
609 if (dar[i].num > 0 && dar[i].den > 0)
610 av_reduce(&st->sample_aspect_ratio.num,
611 &st->sample_aspect_ratio.den,
612 dar[i].num, dar[i].den, INT_MAX);
613 //av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
614
615 // copy and convert language codes to the frontend
616 if (asf->streams[i].stream_language_index < 128) {
617 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
618 if (rfc1766 && strlen(rfc1766) > 1) {
619 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
620 const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
621 if (iso6392)
622 av_metadata_set2(&st->metadata, "language", iso6392, 0);
623 }
624 }
625 }
626 }
627
628 return 0;
629 }
630
631 #define DO_2BITS(bits, var, defval) \
632 switch (bits & 3) \
633 { \
634 case 3: var = get_le32(pb); rsize += 4; break; \
635 case 2: var = get_le16(pb); rsize += 2; break; \
636 case 1: var = get_byte(pb); rsize++; break; \
637 default: var = defval; break; \
638 }
639
640 /**
641 * Load a single ASF packet into the demuxer.
642 * @param s demux context
643 * @param pb context to read data from
644 * @return 0 on success, <0 on error
645 */
646 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
647 {
648 ASFContext *asf = s->priv_data;
649 uint32_t packet_length, padsize;
650 int rsize = 8;
651 int c, d, e, off;
652
653 // if we do not know packet size, allow skipping up to 32 kB
654 off= 32768;
655 if (s->packet_size > 0)
656 off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
657
658 c=d=e=-1;
659 while(off-- > 0){
660 c=d; d=e;
661 e= get_byte(pb);
662 if(c == 0x82 && !d && !e)
663 break;
664 }
665
666 if (c != 0x82) {
667 /**
668 * This code allows handling of -EAGAIN at packet boundaries (i.e.
669 * if the packet sync code above triggers -EAGAIN). This does not
670 * imply complete -EAGAIN handling support at random positions in
671 * the stream.
672 */
673 if (url_ferror(pb) == AVERROR(EAGAIN))
674 return AVERROR(EAGAIN);
675 if (!url_feof(pb))
676 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
677 }
678 if ((c & 0x8f) == 0x82) {
679 if (d || e) {
680 if (!url_feof(pb))
681 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
682 return -1;
683 }
684 c= get_byte(pb);
685 d= get_byte(pb);
686 rsize+=3;
687 }else{
688 url_fseek(pb, -1, SEEK_CUR); //FIXME
689 }
690
691 asf->packet_flags = c;
692 asf->packet_property = d;
693
694 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
695 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
696 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
697
698 //the following checks prevent overflows and infinite loops
699 if(!packet_length || packet_length >= (1U<<29)){
700 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
701 return -1;
702 }
703 if(padsize >= packet_length){
704 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
705 return -1;
706 }
707
708 asf->packet_timestamp = get_le32(pb);
709 get_le16(pb); /* duration */
710 // rsize has at least 11 bytes which have to be present
711
712 if (asf->packet_flags & 0x01) {
713 asf->packet_segsizetype = get_byte(pb); rsize++;
714 asf->packet_segments = asf->packet_segsizetype & 0x3f;
715 } else {
716 asf->packet_segments = 1;
717 asf->packet_segsizetype = 0x80;
718 }
719 asf->packet_size_left = packet_length - padsize - rsize;
720 if (packet_length < asf->hdr.min_pktsize)
721 padsize += asf->hdr.min_pktsize - packet_length;
722 asf->packet_padsize = padsize;
723 dprintf(s, "packet: size=%d padsize=%d left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
724 return 0;
725 }
726
727 /**
728 *
729 * @return <0 if error
730 */
731 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
732 ASFContext *asf = s->priv_data;
733 int rsize = 1;
734 int num = get_byte(pb);
735 int64_t ts0, ts1;
736
737 asf->packet_segments--;
738 asf->packet_key_frame = num >> 7;
739 asf->stream_index = asf->asfid2avid[num & 0x7f];
740 // sequence should be ignored!
741 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
742 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
743 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
744 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
745 if (asf->packet_replic_size >= 8) {
746 asf->packet_obj_size = get_le32(pb);
747 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
748 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
749 return -1;
750 }
751 asf->packet_frag_timestamp = get_le32(pb); // timestamp
752 if(asf->packet_replic_size >= 8+38+4){
753 // for(i=0; i<asf->packet_replic_size-8; i++)
754 // av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
755 // av_log(s, AV_LOG_DEBUG, "\n");
756 url_fskip(pb, 10);
757 ts0= get_le64(pb);
758 ts1= get_le64(pb);
759 url_fskip(pb, 12);
760 get_le32(pb);
761 url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
762 if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
763 else asf->packet_frag_timestamp= AV_NOPTS_VALUE;
764 }else
765 url_fskip(pb, asf->packet_replic_size - 8);
766 rsize += asf->packet_replic_size; // FIXME - check validity
767 } else if (asf->packet_replic_size==1){
768 // multipacket - frag_offset is beginning timestamp
769 asf->packet_time_start = asf->packet_frag_offset;
770 asf->packet_frag_offset = 0;
771 asf->packet_frag_timestamp = asf->packet_timestamp;
772
773 asf->packet_time_delta = get_byte(pb);
774 rsize++;
775 }else if(asf->packet_replic_size!=0){
776 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
777 return -1;
778 }
779 if (asf->packet_flags & 0x01) {
780 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
781 if(asf->packet_frag_size > asf->packet_size_left - rsize){
782 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
783 return -1;
784 }
785 //printf("Fragsize %d\n", asf->packet_frag_size);
786 } else {
787 asf->packet_frag_size = asf->packet_size_left - rsize;
788 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
789 }
790 if (asf->packet_replic_size == 1) {
791 asf->packet_multi_size = asf->packet_frag_size;
792 if (asf->packet_multi_size > asf->packet_size_left)
793 return -1;
794 }
795 asf->packet_size_left -= rsize;
796 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
797
798 return 0;
799 }
800
801 /**
802 * Parse data from individual ASF packets (which were previously loaded
803 * with asf_get_packet()).
804 * @param s demux context
805 * @param pb context to read data from
806 * @param pkt pointer to store packet data into
807 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
808 * packets need to be loaded (through asf_get_packet())
809 */
810 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
811 {
812 ASFContext *asf = s->priv_data;
813 ASFStream *asf_st = 0;
814 for (;;) {
815 if(url_feof(pb))
816 return AVERROR_EOF;
817 if (asf->packet_size_left < FRAME_HEADER_SIZE
818 || asf->packet_segments < 1) {
819 //asf->packet_size_left <= asf->packet_padsize) {
820 int ret = asf->packet_size_left + asf->packet_padsize;
821 //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
822 assert(ret>=0);
823 /* fail safe */
824 url_fskip(pb, ret);
825
826 asf->packet_pos= url_ftell(pb);
827 if (asf->data_object_size != (uint64_t)-1 &&
828 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
829 return AVERROR_EOF; /* Do not exceed the size of the data object */
830 return 1;
831 }
832 if (asf->packet_time_start == 0) {
833 if(asf_read_frame_header(s, pb) < 0){
834 asf->packet_segments= 0;
835 continue;
836 }
837 if (asf->stream_index < 0
838 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
839 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
840 ) {
841 asf->packet_time_start = 0;
842 /* unhandled packet (should not happen) */
843 url_fskip(pb, asf->packet_frag_size);
844 asf->packet_size_left -= asf->packet_frag_size;
845 if(asf->stream_index < 0)
846 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
847 continue;
848 }
849 asf->asf_st = s->streams[asf->stream_index]->priv_data;
850 }
851 asf_st = asf->asf_st;
852
853 if (asf->packet_replic_size == 1) {
854 // frag_offset is here used as the beginning timestamp
855 asf->packet_frag_timestamp = asf->packet_time_start;
856 asf->packet_time_start += asf->packet_time_delta;
857 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
858 asf->packet_size_left--;
859 asf->packet_multi_size--;
860 if (asf->packet_multi_size < asf->packet_obj_size)
861 {
862 asf->packet_time_start = 0;
863 url_fskip(pb, asf->packet_multi_size);
864 asf->packet_size_left -= asf->packet_multi_size;
865 continue;
866 }
867 asf->packet_multi_size -= asf->packet_obj_size;
868 //printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
869 }
870 if( /*asf->packet_frag_size == asf->packet_obj_size*/
871 asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
872 && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
873 av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
874 asf_st->frag_offset, asf->packet_frag_size,
875 asf->packet_obj_size, asf_st->pkt.size);
876 asf->packet_obj_size= asf_st->pkt.size;
877 }
878
879 if ( asf_st->pkt.size != asf->packet_obj_size
880 || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
881 if(asf_st->pkt.data){
882 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
883 asf_st->frag_offset = 0;
884 av_free_packet(&asf_st->pkt);
885 }
886 /* new packet */
887 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
888 asf_st->seq = asf->packet_seq;
889 asf_st->pkt.dts = asf->packet_frag_timestamp;
890 asf_st->pkt.stream_index = asf->stream_index;
891 asf_st->pkt.pos =
892 asf_st->packet_pos= asf->packet_pos;
893 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
894 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
895 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
896 if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
897 asf->packet_key_frame = 1;
898 if (asf->packet_key_frame)
899 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
900 }
901
902 /* read data */
903 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
904 // s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
905 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
906 asf->packet_size_left -= asf->packet_frag_size;
907 if (asf->packet_size_left < 0)
908 continue;
909
910 if( asf->packet_frag_offset >= asf_st->pkt.size
911 || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
912 av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
913 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
914 continue;
915 }
916
917 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
918 asf->packet_frag_size);
919 if (s->key && s->keylen == 20)
920 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
921 asf->packet_frag_size);
922 asf_st->frag_offset += asf->packet_frag_size;
923 /* test if whole packet is read */
924 if (asf_st->frag_offset == asf_st->pkt.size) {
925 //workaround for macroshit radio DVR-MS files
926 if( s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
927 && asf_st->pkt.size > 100){
928 int i;
929 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
930 if(i == asf_st->pkt.size){
931 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
932 asf_st->frag_offset = 0;
933 av_free_packet(&asf_st->pkt);
934 continue;
935 }
936 }
937
938 /* return packet */
939 if (asf_st->ds_span > 1) {
940 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
941 av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
942 }else{
943 /* packet descrambling */
944 uint8_t *newdata = av_malloc(asf_st->pkt.size);
945 if (newdata) {
946 int offset = 0;
947 while (offset < asf_st->pkt.size) {
948 int off = offset / asf_st->ds_chunk_size;
949 int row = off / asf_st->ds_span;
950 int col = off % asf_st->ds_span;
951 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
952 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
953
954 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
955 assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
956 memcpy(newdata + offset,
957 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
958 asf_st->ds_chunk_size);
959 offset += asf_st->ds_chunk_size;
960 }
961 av_free(asf_st->pkt.data);
962 asf_st->pkt.data = newdata;
963 }
964 }
965 }
966 asf_st->frag_offset = 0;
967 *pkt= asf_st->pkt;
968 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
969 asf_st->pkt.size = 0;
970 asf_st->pkt.data = 0;
971 break; // packet completed
972 }
973 }
974 return 0;
975 }
976
977 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
978 {
979 ASFContext *asf = s->priv_data;
980
981 for (;;) {
982 int ret;
983
984 /* parse cached packets, if any */
985 if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
986 return ret;
987 if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
988 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
989 asf->packet_time_start = 0;
990 }
991
992 return 0;
993 }
994
995 // Added to support seeking after packets have been read
996 // If information is not reset, read_packet fails due to
997 // leftover information from previous reads
998 static void asf_reset_header(AVFormatContext *s)
999 {
1000 ASFContext *asf = s->priv_data;
1001 ASFStream *asf_st;
1002 int i;
1003
1004 asf->packet_nb_frames = 0;
1005 asf->packet_size_left = 0;
1006 asf->packet_segments = 0;
1007 asf->packet_flags = 0;
1008 asf->packet_property = 0;
1009 asf->packet_timestamp = 0;
1010 asf->packet_segsizetype = 0;
1011 asf->packet_segments = 0;
1012 asf->packet_seq = 0;
1013 asf->packet_replic_size = 0;
1014 asf->packet_key_frame = 0;
1015 asf->packet_padsize = 0;
1016 asf->packet_frag_offset = 0;
1017 asf->packet_frag_size = 0;
1018 asf->packet_frag_timestamp = 0;
1019 asf->packet_multi_size = 0;
1020 asf->packet_obj_size = 0;
1021 asf->packet_time_delta = 0;
1022 asf->packet_time_start = 0;
1023
1024 for(i=0; i<s->nb_streams; i++){
1025 asf_st= s->streams[i]->priv_data;
1026 av_free_packet(&asf_st->pkt);
1027 asf_st->frag_offset=0;
1028 asf_st->seq=0;
1029 }
1030 asf->asf_st= NULL;
1031 }
1032
1033 static int asf_read_close(AVFormatContext *s)
1034 {
1035 int i;
1036
1037 asf_reset_header(s);
1038 for(i=0;i<s->nb_streams;i++) {
1039 AVStream *st = s->streams[i];
1040 av_free(st->codec->palctrl);
1041 }
1042 return 0;
1043 }
1044
1045 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1046 {
1047 AVPacket pkt1, *pkt = &pkt1;
1048 ASFStream *asf_st;
1049 int64_t pts;
1050 int64_t pos= *ppos;
1051 int i;
1052 int64_t start_pos[s->nb_streams];
1053
1054 for(i=0; i<s->nb_streams; i++){
1055 start_pos[i]= pos;
1056 }
1057
1058 if (s->packet_size > 0)
1059 pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1060 *ppos= pos;
1061 url_fseek(s->pb, pos, SEEK_SET);
1062
1063 //printf("asf_read_pts\n");
1064 asf_reset_header(s);
1065 for(;;){
1066 if (av_read_frame(s, pkt) < 0){
1067 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1068 return AV_NOPTS_VALUE;
1069 }
1070
1071 pts= pkt->pts;
1072
1073 av_free_packet(pkt);
1074 if(pkt->flags&AV_PKT_FLAG_KEY){
1075 i= pkt->stream_index;
1076
1077 asf_st= s->streams[i]->priv_data;
1078
1079 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1080 pos= asf_st->packet_pos;
1081
1082 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1083 start_pos[i]= asf_st->packet_pos + 1;
1084
1085 if(pkt->stream_index == stream_index)
1086 break;
1087 }
1088 }
1089
1090 *ppos= pos;
1091 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1092
1093 return pts;
1094 }
1095
1096 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1097 {
1098 ff_asf_guid g;
1099 ASFContext *asf = s->priv_data;
1100 int64_t current_pos= url_ftell(s->pb);
1101 int i;
1102
1103 url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1104 get_guid(s->pb, &g);
1105 if (!guidcmp(&g, &index_guid)) {
1106 int64_t itime, last_pos=-1;
1107 int pct, ict;
1108 int64_t av_unused gsize= get_le64(s->pb);
1109 get_guid(s->pb, &g);
1110 itime=get_le64(s->pb);
1111 pct=get_le32(s->pb);
1112 ict=get_le32(s->pb);
1113 av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1114
1115 for (i=0;i<ict;i++){
1116 int pktnum=get_le32(s->pb);
1117 int pktct =get_le16(s->pb);
1118 int64_t pos = s->data_offset + s->packet_size*(int64_t)pktnum;
1119 int64_t index_pts= av_rescale(itime, i, 10000);
1120
1121 if(pos != last_pos){
1122 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1123 av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1124 last_pos=pos;
1125 }
1126 }
1127 asf->index_read= 1;
1128 }
1129 url_fseek(s->pb, current_pos, SEEK_SET);
1130 }
1131
1132 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1133 {
1134 ASFContext *asf = s->priv_data;
1135 AVStream *st = s->streams[stream_index];
1136 int64_t pos;
1137 int index;
1138
1139 if (s->packet_size <= 0)
1140 return -1;
1141
1142 /* Try using the protocol's read_seek if available */
1143 if(s->pb) {
1144 int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1145 if(ret >= 0)
1146 asf_reset_header(s);
1147 if (ret != AVERROR(ENOSYS))
1148 return ret;
1149 }
1150
1151 if (!asf->index_read)
1152 asf_build_simple_index(s, stream_index);
1153
1154 if(!(asf->index_read && st->index_entries)){
1155 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1156 return -1;
1157 }else{
1158 index= av_index_search_timestamp(st, pts, flags);
1159 if(index<0)
1160 return -1;
1161
1162 /* find the position */
1163 pos = st->index_entries[index].pos;
1164
1165 // various attempts to find key frame have failed so far
1166 // asf_reset_header(s);
1167 // url_fseek(s->pb, pos, SEEK_SET);
1168 // key_pos = pos;
1169 // for(i=0;i<16;i++){
1170 // pos = url_ftell(s->pb);
1171 // if (av_read_frame(s, &pkt) < 0){
1172 // av_log(s, AV_LOG_INFO, "seek failed\n");
1173 // return -1;
1174 // }
1175 // asf_st = s->streams[stream_index]->priv_data;
1176 // pos += st->parser->frame_offset;
1177 //
1178 // if (pkt.size > b) {
1179 // b = pkt.size;
1180 // key_pos = pos;
1181 // }
1182 //
1183 // av_free_packet(&pkt);
1184 // }
1185
1186 /* do the seek */
1187 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1188 url_fseek(s->pb, pos, SEEK_SET);
1189 }
1190 asf_reset_header(s);
1191 return 0;
1192 }
1193
1194 AVInputFormat asf_demuxer = {
1195 "asf",
1196 NULL_IF_CONFIG_SMALL("ASF format"),
1197 sizeof(ASFContext),
1198 asf_probe,
1199 asf_read_header,
1200 asf_read_packet,
1201 asf_read_close,
1202 asf_read_seek,
1203 asf_read_pts,
1204 .metadata_conv = ff_asf_metadata_conv,
1205 };