bbc27305e23ee9dac211870425ee6974ca0b8e22
[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 get_guid(pb, &g);
208 gsize = get_le64(pb);
209 dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
210 print_guid(&g);
211 dprintf(s, " size=0x%"PRIx64"\n", gsize);
212 if (!guidcmp(&g, &ff_asf_data_header)) {
213 asf->data_object_offset = url_ftell(pb);
214 // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
215 if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
216 asf->data_object_size = gsize - 24;
217 } else {
218 asf->data_object_size = (uint64_t)-1;
219 }
220 break;
221 }
222 if (gsize < 24)
223 return -1;
224 if (!guidcmp(&g, &ff_asf_file_header)) {
225 get_guid(pb, &asf->hdr.guid);
226 asf->hdr.file_size = get_le64(pb);
227 asf->hdr.create_time = get_le64(pb);
228 asf->nb_packets = get_le64(pb);
229 asf->hdr.play_time = get_le64(pb);
230 asf->hdr.send_time = get_le64(pb);
231 asf->hdr.preroll = get_le32(pb);
232 asf->hdr.ignore = get_le32(pb);
233 asf->hdr.flags = get_le32(pb);
234 asf->hdr.min_pktsize = get_le32(pb);
235 asf->hdr.max_pktsize = get_le32(pb);
236 asf->hdr.max_bitrate = get_le32(pb);
237 s->packet_size = asf->hdr.max_pktsize;
238 } else if (!guidcmp(&g, &ff_asf_stream_header)) {
239 enum AVMediaType type;
240 int type_specific_size, sizeX;
241 uint64_t total_size;
242 unsigned int tag1;
243 int64_t pos1, pos2, start_time;
244 int test_for_ext_stream_audio, is_dvr_ms_audio=0;
245
246 pos1 = url_ftell(pb);
247
248 st = av_new_stream(s, 0);
249 if (!st)
250 return AVERROR(ENOMEM);
251 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
252 asf_st = av_mallocz(sizeof(ASFStream));
253 if (!asf_st)
254 return AVERROR(ENOMEM);
255 st->priv_data = asf_st;
256 start_time = asf->hdr.preroll;
257
258 asf_st->stream_language_index = 128; // invalid stream index means no language info
259
260 if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
261 st->duration = asf->hdr.play_time /
262 (10000000 / 1000) - start_time;
263 }
264 get_guid(pb, &g);
265
266 test_for_ext_stream_audio = 0;
267 if (!guidcmp(&g, &ff_asf_audio_stream)) {
268 type = AVMEDIA_TYPE_AUDIO;
269 } else if (!guidcmp(&g, &ff_asf_video_stream)) {
270 type = AVMEDIA_TYPE_VIDEO;
271 } else if (!guidcmp(&g, &ff_asf_command_stream)) {
272 type = AVMEDIA_TYPE_DATA;
273 } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
274 test_for_ext_stream_audio = 1;
275 type = AVMEDIA_TYPE_UNKNOWN;
276 } else {
277 return -1;
278 }
279 get_guid(pb, &g);
280 total_size = get_le64(pb);
281 type_specific_size = get_le32(pb);
282 get_le32(pb);
283 st->id = get_le16(pb) & 0x7f; /* stream id */
284 // mapping of asf ID to AV stream ID;
285 asf->asfid2avid[st->id] = s->nb_streams - 1;
286
287 get_le32(pb);
288
289 if (test_for_ext_stream_audio) {
290 get_guid(pb, &g);
291 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
292 type = AVMEDIA_TYPE_AUDIO;
293 is_dvr_ms_audio=1;
294 get_guid(pb, &g);
295 get_le32(pb);
296 get_le32(pb);
297 get_le32(pb);
298 get_guid(pb, &g);
299 get_le32(pb);
300 }
301 }
302
303 st->codec->codec_type = type;
304 if (type == AVMEDIA_TYPE_AUDIO) {
305 ff_get_wav_header(pb, st->codec, type_specific_size);
306 if (is_dvr_ms_audio) {
307 // codec_id and codec_tag are unreliable in dvr_ms
308 // files. Set them later by probing stream.
309 st->codec->codec_id = CODEC_ID_PROBE;
310 st->codec->codec_tag = 0;
311 }
312 if (st->codec->codec_id == CODEC_ID_AAC) {
313 st->need_parsing = AVSTREAM_PARSE_NONE;
314 } else {
315 st->need_parsing = AVSTREAM_PARSE_FULL;
316 }
317 /* We have to init the frame size at some point .... */
318 pos2 = url_ftell(pb);
319 if (gsize >= (pos2 + 8 - pos1 + 24)) {
320 asf_st->ds_span = get_byte(pb);
321 asf_st->ds_packet_size = get_le16(pb);
322 asf_st->ds_chunk_size = get_le16(pb);
323 get_le16(pb); //ds_data_size
324 get_byte(pb); //ds_silence_data
325 }
326 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
327 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
328 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
329 if (asf_st->ds_span > 1) {
330 if (!asf_st->ds_chunk_size
331 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
332 || asf_st->ds_packet_size % asf_st->ds_chunk_size)
333 asf_st->ds_span = 0; // disable descrambling
334 }
335 switch (st->codec->codec_id) {
336 case CODEC_ID_MP3:
337 st->codec->frame_size = MPA_FRAME_SIZE;
338 break;
339 case CODEC_ID_PCM_S16LE:
340 case CODEC_ID_PCM_S16BE:
341 case CODEC_ID_PCM_U16LE:
342 case CODEC_ID_PCM_U16BE:
343 case CODEC_ID_PCM_S8:
344 case CODEC_ID_PCM_U8:
345 case CODEC_ID_PCM_ALAW:
346 case CODEC_ID_PCM_MULAW:
347 st->codec->frame_size = 1;
348 break;
349 default:
350 /* This is probably wrong, but it prevents a crash later */
351 st->codec->frame_size = 1;
352 break;
353 }
354 } else if (type == AVMEDIA_TYPE_VIDEO) {
355 get_le32(pb);
356 get_le32(pb);
357 get_byte(pb);
358 size = get_le16(pb); /* size */
359 sizeX= get_le32(pb); /* size */
360 st->codec->width = get_le32(pb);
361 st->codec->height = get_le32(pb);
362 /* not available for asf */
363 get_le16(pb); /* panes */
364 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
365 tag1 = get_le32(pb);
366 url_fskip(pb, 20);
367 // av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
368 size= sizeX;
369 if (size > 40) {
370 st->codec->extradata_size = size - 40;
371 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
372 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
373 }
374
375 /* Extract palette from extradata if bpp <= 8 */
376 /* This code assumes that extradata contains only palette */
377 /* This is true for all paletted codecs implemented in ffmpeg */
378 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
379 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
380 #if HAVE_BIGENDIAN
381 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
382 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
383 #else
384 memcpy(st->codec->palctrl->palette, st->codec->extradata,
385 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
386 #endif
387 st->codec->palctrl->palette_changed = 1;
388 }
389
390 st->codec->codec_tag = tag1;
391 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
392 if(tag1 == MKTAG('D', 'V', 'R', ' '))
393 st->need_parsing = AVSTREAM_PARSE_FULL;
394 }
395 pos2 = url_ftell(pb);
396 url_fskip(pb, gsize - (pos2 - pos1 + 24));
397 } else if (!guidcmp(&g, &ff_asf_comment_header)) {
398 int len1, len2, len3, len4, len5;
399
400 len1 = get_le16(pb);
401 len2 = get_le16(pb);
402 len3 = get_le16(pb);
403 len4 = get_le16(pb);
404 len5 = get_le16(pb);
405 get_tag(s, "title" , 0, len1);
406 get_tag(s, "author" , 0, len2);
407 get_tag(s, "copyright", 0, len3);
408 get_tag(s, "comment" , 0, len4);
409 url_fskip(pb, len5);
410 } else if (!guidcmp(&g, &stream_bitrate_guid)) {
411 int stream_count = get_le16(pb);
412 int j;
413
414 // av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
415 // av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
416 for(j = 0; j < stream_count; j++) {
417 int flags, bitrate, stream_id;
418
419 flags= get_le16(pb);
420 bitrate= get_le32(pb);
421 stream_id= (flags & 0x7f);
422 // av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
423 asf->stream_bitrates[stream_id]= bitrate;
424 }
425 } else if (!guidcmp(&g, &ff_asf_language_guid)) {
426 int j;
427 int stream_count = get_le16(pb);
428 for(j = 0; j < stream_count; j++) {
429 char lang[6];
430 unsigned int lang_len = get_byte(pb);
431 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
432 if (j < 128)
433 av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
434 }
435 } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
436 int desc_count, i;
437
438 desc_count = get_le16(pb);
439 for(i=0;i<desc_count;i++) {
440 int name_len,value_type,value_len;
441 char name[1024];
442
443 name_len = get_le16(pb);
444 if (name_len%2) // must be even, broken lavf versions wrote len-1
445 name_len += 1;
446 get_str16_nolen(pb, name_len, name, sizeof(name));
447 value_type = get_le16(pb);
448 value_len = get_le16(pb);
449 if (!value_type && value_len%2)
450 value_len += 1;
451 get_tag(s, name, value_type, value_len);
452 }
453 } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
454 int n, stream_num, name_len, value_len, value_type, value_num;
455 n = get_le16(pb);
456
457 for(i=0;i<n;i++) {
458 char name[1024];
459
460 get_le16(pb); //lang_list_index
461 stream_num= get_le16(pb);
462 name_len= get_le16(pb);
463 value_type= get_le16(pb);
464 value_len= get_le32(pb);
465
466 get_str16_nolen(pb, name_len, name, sizeof(name));
467 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
468 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
469 url_fskip(pb, value_len - 2);
470
471 if(stream_num<128){
472 if (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
473 else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
474 }
475 }
476 } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
477 int ext_len, payload_ext_ct, stream_ct;
478 uint32_t ext_d, leak_rate, stream_num;
479 unsigned int stream_languageid_index;
480
481 get_le64(pb); // starttime
482 get_le64(pb); // endtime
483 leak_rate = get_le32(pb); // leak-datarate
484 get_le32(pb); // bucket-datasize
485 get_le32(pb); // init-bucket-fullness
486 get_le32(pb); // alt-leak-datarate
487 get_le32(pb); // alt-bucket-datasize
488 get_le32(pb); // alt-init-bucket-fullness
489 get_le32(pb); // max-object-size
490 get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
491 stream_num = get_le16(pb); // stream-num
492
493 stream_languageid_index = get_le16(pb); // stream-language-id-index
494 if (stream_num < 128)
495 asf->streams[stream_num].stream_language_index = stream_languageid_index;
496
497 get_le64(pb); // avg frametime in 100ns units
498 stream_ct = get_le16(pb); //stream-name-count
499 payload_ext_ct = get_le16(pb); //payload-extension-system-count
500
501 if (stream_num < 128)
502 bitrate[stream_num] = leak_rate;
503
504 for (i=0; i<stream_ct; i++){
505 get_le16(pb);
506 ext_len = get_le16(pb);
507 url_fseek(pb, ext_len, SEEK_CUR);
508 }
509
510 for (i=0; i<payload_ext_ct; i++){
511 get_guid(pb, &g);
512 ext_d=get_le16(pb);
513 ext_len=get_le32(pb);
514 url_fseek(pb, ext_len, SEEK_CUR);
515 }
516
517 // there could be a optional stream properties object to follow
518 // if so the next iteration will pick it up
519 } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
520 int v1, v2;
521 get_guid(pb, &g);
522 v1 = get_le32(pb);
523 v2 = get_le16(pb);
524 } else if (!guidcmp(&g, &ff_asf_marker_header)) {
525 int i, count, name_len;
526 char name[1024];
527
528 get_le64(pb); // reserved 16 bytes
529 get_le64(pb); // ...
530 count = get_le32(pb); // markers count
531 get_le16(pb); // reserved 2 bytes
532 name_len = get_le16(pb); // name length
533 for(i=0;i<name_len;i++){
534 get_byte(pb); // skip the name
535 }
536
537 for(i=0;i<count;i++){
538 int64_t pres_time;
539 int name_len;
540
541 get_le64(pb); // offset, 8 bytes
542 pres_time = get_le64(pb); // presentation time
543 get_le16(pb); // entry length
544 get_le32(pb); // send time
545 get_le32(pb); // flags
546 name_len = get_le32(pb); // name length
547 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
548 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
549 }
550 #if 0
551 } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
552 int len, v1, n, num;
553 char str[256], *q;
554 char tag[16];
555
556 get_guid(pb, &g);
557 print_guid(&g);
558
559 n = get_le32(pb);
560 for(i=0;i<n;i++) {
561 num = get_le16(pb); /* stream number */
562 get_str16(pb, str, sizeof(str));
563 get_str16(pb, str, sizeof(str));
564 len = get_le16(pb);
565 q = tag;
566 while (len > 0) {
567 v1 = get_byte(pb);
568 if ((q - tag) < sizeof(tag) - 1)
569 *q++ = v1;
570 len--;
571 }
572 *q = '\0';
573 }
574 #endif
575 } else if (url_feof(pb)) {
576 return -1;
577 } else {
578 if (!s->keylen) {
579 if (!guidcmp(&g, &ff_asf_content_encryption)) {
580 av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
581 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
582 av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
583 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
584 av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
585 }
586 }
587 url_fseek(pb, gsize - 24, SEEK_CUR);
588 }
589 }
590 get_guid(pb, &g);
591 get_le64(pb);
592 get_byte(pb);
593 get_byte(pb);
594 if (url_feof(pb))
595 return -1;
596 asf->data_offset = url_ftell(pb);
597 asf->packet_size_left = 0;
598
599
600 for(i=0; i<128; i++){
601 int stream_num= asf->asfid2avid[i];
602 if(stream_num>=0){
603 AVStream *st = s->streams[stream_num];
604 if (!st->codec->bit_rate)
605 st->codec->bit_rate = bitrate[i];
606 if (dar[i].num > 0 && dar[i].den > 0)
607 av_reduce(&st->sample_aspect_ratio.num,
608 &st->sample_aspect_ratio.den,
609 dar[i].num, dar[i].den, INT_MAX);
610 //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);
611
612 // copy and convert language codes to the frontend
613 if (asf->streams[i].stream_language_index < 128) {
614 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
615 if (rfc1766 && strlen(rfc1766) > 1) {
616 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
617 const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
618 if (iso6392)
619 av_metadata_set2(&st->metadata, "language", iso6392, 0);
620 }
621 }
622 }
623 }
624
625 return 0;
626 }
627
628 #define DO_2BITS(bits, var, defval) \
629 switch (bits & 3) \
630 { \
631 case 3: var = get_le32(pb); rsize += 4; break; \
632 case 2: var = get_le16(pb); rsize += 2; break; \
633 case 1: var = get_byte(pb); rsize++; break; \
634 default: var = defval; break; \
635 }
636
637 /**
638 * Load a single ASF packet into the demuxer.
639 * @param s demux context
640 * @param pb context to read data from
641 * @return 0 on success, <0 on error
642 */
643 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
644 {
645 ASFContext *asf = s->priv_data;
646 uint32_t packet_length, padsize;
647 int rsize = 8;
648 int c, d, e, off;
649
650 // if we do not know packet size, allow skipping up to 32 kB
651 off= 32768;
652 if (s->packet_size > 0)
653 off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
654
655 c=d=e=-1;
656 while(off-- > 0){
657 c=d; d=e;
658 e= get_byte(pb);
659 if(c == 0x82 && !d && !e)
660 break;
661 }
662
663 if (c != 0x82) {
664 /**
665 * This code allows handling of -EAGAIN at packet boundaries (i.e.
666 * if the packet sync code above triggers -EAGAIN). This does not
667 * imply complete -EAGAIN handling support at random positions in
668 * the stream.
669 */
670 if (url_ferror(pb) == AVERROR(EAGAIN))
671 return AVERROR(EAGAIN);
672 if (!url_feof(pb))
673 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
674 }
675 if ((c & 0x8f) == 0x82) {
676 if (d || e) {
677 if (!url_feof(pb))
678 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
679 return -1;
680 }
681 c= get_byte(pb);
682 d= get_byte(pb);
683 rsize+=3;
684 }else{
685 url_fseek(pb, -1, SEEK_CUR); //FIXME
686 }
687
688 asf->packet_flags = c;
689 asf->packet_property = d;
690
691 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
692 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
693 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
694
695 //the following checks prevent overflows and infinite loops
696 if(!packet_length || packet_length >= (1U<<29)){
697 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
698 return -1;
699 }
700 if(padsize >= packet_length){
701 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
702 return -1;
703 }
704
705 asf->packet_timestamp = get_le32(pb);
706 get_le16(pb); /* duration */
707 // rsize has at least 11 bytes which have to be present
708
709 if (asf->packet_flags & 0x01) {
710 asf->packet_segsizetype = get_byte(pb); rsize++;
711 asf->packet_segments = asf->packet_segsizetype & 0x3f;
712 } else {
713 asf->packet_segments = 1;
714 asf->packet_segsizetype = 0x80;
715 }
716 asf->packet_size_left = packet_length - padsize - rsize;
717 if (packet_length < asf->hdr.min_pktsize)
718 padsize += asf->hdr.min_pktsize - packet_length;
719 asf->packet_padsize = padsize;
720 dprintf(s, "packet: size=%d padsize=%d left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
721 return 0;
722 }
723
724 /**
725 *
726 * @return <0 if error
727 */
728 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
729 ASFContext *asf = s->priv_data;
730 int rsize = 1;
731 int num = get_byte(pb);
732 int64_t ts0, ts1;
733
734 asf->packet_segments--;
735 asf->packet_key_frame = num >> 7;
736 asf->stream_index = asf->asfid2avid[num & 0x7f];
737 // sequence should be ignored!
738 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
739 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
740 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
741 //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);
742 if (asf->packet_replic_size >= 8) {
743 asf->packet_obj_size = get_le32(pb);
744 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
745 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
746 return -1;
747 }
748 asf->packet_frag_timestamp = get_le32(pb); // timestamp
749 if(asf->packet_replic_size >= 8+38+4){
750 // for(i=0; i<asf->packet_replic_size-8; i++)
751 // av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
752 // av_log(s, AV_LOG_DEBUG, "\n");
753 url_fskip(pb, 10);
754 ts0= get_le64(pb);
755 ts1= get_le64(pb);
756 url_fskip(pb, 12);
757 get_le32(pb);
758 url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
759 if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
760 else asf->packet_frag_timestamp= AV_NOPTS_VALUE;
761 }else
762 url_fskip(pb, asf->packet_replic_size - 8);
763 rsize += asf->packet_replic_size; // FIXME - check validity
764 } else if (asf->packet_replic_size==1){
765 // multipacket - frag_offset is beginning timestamp
766 asf->packet_time_start = asf->packet_frag_offset;
767 asf->packet_frag_offset = 0;
768 asf->packet_frag_timestamp = asf->packet_timestamp;
769
770 asf->packet_time_delta = get_byte(pb);
771 rsize++;
772 }else if(asf->packet_replic_size!=0){
773 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
774 return -1;
775 }
776 if (asf->packet_flags & 0x01) {
777 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
778 if(asf->packet_frag_size > asf->packet_size_left - rsize){
779 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
780 return -1;
781 }
782 //printf("Fragsize %d\n", asf->packet_frag_size);
783 } else {
784 asf->packet_frag_size = asf->packet_size_left - rsize;
785 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
786 }
787 if (asf->packet_replic_size == 1) {
788 asf->packet_multi_size = asf->packet_frag_size;
789 if (asf->packet_multi_size > asf->packet_size_left)
790 return -1;
791 }
792 asf->packet_size_left -= rsize;
793 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
794
795 return 0;
796 }
797
798 /**
799 * Parse data from individual ASF packets (which were previously loaded
800 * with asf_get_packet()).
801 * @param s demux context
802 * @param pb context to read data from
803 * @param pkt pointer to store packet data into
804 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
805 * packets need to be loaded (through asf_get_packet())
806 */
807 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
808 {
809 ASFContext *asf = s->priv_data;
810 ASFStream *asf_st = 0;
811 for (;;) {
812 if(url_feof(pb))
813 return AVERROR_EOF;
814 if (asf->packet_size_left < FRAME_HEADER_SIZE
815 || asf->packet_segments < 1) {
816 //asf->packet_size_left <= asf->packet_padsize) {
817 int ret = asf->packet_size_left + asf->packet_padsize;
818 //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
819 assert(ret>=0);
820 /* fail safe */
821 url_fskip(pb, ret);
822
823 asf->packet_pos= url_ftell(pb);
824 if (asf->data_object_size != (uint64_t)-1 &&
825 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
826 return AVERROR_EOF; /* Do not exceed the size of the data object */
827 return 1;
828 }
829 if (asf->packet_time_start == 0) {
830 if(asf_read_frame_header(s, pb) < 0){
831 asf->packet_segments= 0;
832 continue;
833 }
834 if (asf->stream_index < 0
835 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
836 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
837 ) {
838 asf->packet_time_start = 0;
839 /* unhandled packet (should not happen) */
840 url_fskip(pb, asf->packet_frag_size);
841 asf->packet_size_left -= asf->packet_frag_size;
842 if(asf->stream_index < 0)
843 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
844 continue;
845 }
846 asf->asf_st = s->streams[asf->stream_index]->priv_data;
847 }
848 asf_st = asf->asf_st;
849
850 if (asf->packet_replic_size == 1) {
851 // frag_offset is here used as the beginning timestamp
852 asf->packet_frag_timestamp = asf->packet_time_start;
853 asf->packet_time_start += asf->packet_time_delta;
854 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
855 asf->packet_size_left--;
856 asf->packet_multi_size--;
857 if (asf->packet_multi_size < asf->packet_obj_size)
858 {
859 asf->packet_time_start = 0;
860 url_fskip(pb, asf->packet_multi_size);
861 asf->packet_size_left -= asf->packet_multi_size;
862 continue;
863 }
864 asf->packet_multi_size -= asf->packet_obj_size;
865 //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);
866 }
867 if( /*asf->packet_frag_size == asf->packet_obj_size*/
868 asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
869 && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
870 av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
871 asf_st->frag_offset, asf->packet_frag_size,
872 asf->packet_obj_size, asf_st->pkt.size);
873 asf->packet_obj_size= asf_st->pkt.size;
874 }
875
876 if ( asf_st->pkt.size != asf->packet_obj_size
877 || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
878 if(asf_st->pkt.data){
879 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
880 asf_st->frag_offset = 0;
881 av_free_packet(&asf_st->pkt);
882 }
883 /* new packet */
884 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
885 asf_st->seq = asf->packet_seq;
886 asf_st->pkt.dts = asf->packet_frag_timestamp;
887 asf_st->pkt.stream_index = asf->stream_index;
888 asf_st->pkt.pos =
889 asf_st->packet_pos= asf->packet_pos;
890 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
891 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
892 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
893 if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
894 asf->packet_key_frame = 1;
895 if (asf->packet_key_frame)
896 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
897 }
898
899 /* read data */
900 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
901 // s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
902 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
903 asf->packet_size_left -= asf->packet_frag_size;
904 if (asf->packet_size_left < 0)
905 continue;
906
907 if( asf->packet_frag_offset >= asf_st->pkt.size
908 || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
909 av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
910 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
911 continue;
912 }
913
914 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
915 asf->packet_frag_size);
916 if (s->key && s->keylen == 20)
917 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
918 asf->packet_frag_size);
919 asf_st->frag_offset += asf->packet_frag_size;
920 /* test if whole packet is read */
921 if (asf_st->frag_offset == asf_st->pkt.size) {
922 //workaround for macroshit radio DVR-MS files
923 if( s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
924 && asf_st->pkt.size > 100){
925 int i;
926 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
927 if(i == asf_st->pkt.size){
928 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
929 asf_st->frag_offset = 0;
930 av_free_packet(&asf_st->pkt);
931 continue;
932 }
933 }
934
935 /* return packet */
936 if (asf_st->ds_span > 1) {
937 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
938 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);
939 }else{
940 /* packet descrambling */
941 uint8_t *newdata = av_malloc(asf_st->pkt.size);
942 if (newdata) {
943 int offset = 0;
944 while (offset < asf_st->pkt.size) {
945 int off = offset / asf_st->ds_chunk_size;
946 int row = off / asf_st->ds_span;
947 int col = off % asf_st->ds_span;
948 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
949 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
950
951 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
952 assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
953 memcpy(newdata + offset,
954 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
955 asf_st->ds_chunk_size);
956 offset += asf_st->ds_chunk_size;
957 }
958 av_free(asf_st->pkt.data);
959 asf_st->pkt.data = newdata;
960 }
961 }
962 }
963 asf_st->frag_offset = 0;
964 *pkt= asf_st->pkt;
965 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
966 asf_st->pkt.size = 0;
967 asf_st->pkt.data = 0;
968 break; // packet completed
969 }
970 }
971 return 0;
972 }
973
974 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
975 {
976 ASFContext *asf = s->priv_data;
977
978 for (;;) {
979 int ret;
980
981 /* parse cached packets, if any */
982 if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
983 return ret;
984 if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
985 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
986 asf->packet_time_start = 0;
987 }
988
989 return 0;
990 }
991
992 // Added to support seeking after packets have been read
993 // If information is not reset, read_packet fails due to
994 // leftover information from previous reads
995 static void asf_reset_header(AVFormatContext *s)
996 {
997 ASFContext *asf = s->priv_data;
998 ASFStream *asf_st;
999 int i;
1000
1001 asf->packet_nb_frames = 0;
1002 asf->packet_size_left = 0;
1003 asf->packet_segments = 0;
1004 asf->packet_flags = 0;
1005 asf->packet_property = 0;
1006 asf->packet_timestamp = 0;
1007 asf->packet_segsizetype = 0;
1008 asf->packet_segments = 0;
1009 asf->packet_seq = 0;
1010 asf->packet_replic_size = 0;
1011 asf->packet_key_frame = 0;
1012 asf->packet_padsize = 0;
1013 asf->packet_frag_offset = 0;
1014 asf->packet_frag_size = 0;
1015 asf->packet_frag_timestamp = 0;
1016 asf->packet_multi_size = 0;
1017 asf->packet_obj_size = 0;
1018 asf->packet_time_delta = 0;
1019 asf->packet_time_start = 0;
1020
1021 for(i=0; i<s->nb_streams; i++){
1022 asf_st= s->streams[i]->priv_data;
1023 av_free_packet(&asf_st->pkt);
1024 asf_st->frag_offset=0;
1025 asf_st->seq=0;
1026 }
1027 asf->asf_st= NULL;
1028 }
1029
1030 static int asf_read_close(AVFormatContext *s)
1031 {
1032 int i;
1033
1034 asf_reset_header(s);
1035 for(i=0;i<s->nb_streams;i++) {
1036 AVStream *st = s->streams[i];
1037 av_free(st->codec->palctrl);
1038 }
1039 return 0;
1040 }
1041
1042 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1043 {
1044 AVPacket pkt1, *pkt = &pkt1;
1045 ASFStream *asf_st;
1046 int64_t pts;
1047 int64_t pos= *ppos;
1048 int i;
1049 int64_t start_pos[s->nb_streams];
1050
1051 for(i=0; i<s->nb_streams; i++){
1052 start_pos[i]= pos;
1053 }
1054
1055 if (s->packet_size > 0)
1056 pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1057 *ppos= pos;
1058 url_fseek(s->pb, pos, SEEK_SET);
1059
1060 //printf("asf_read_pts\n");
1061 asf_reset_header(s);
1062 for(;;){
1063 if (av_read_frame(s, pkt) < 0){
1064 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1065 return AV_NOPTS_VALUE;
1066 }
1067
1068 pts= pkt->pts;
1069
1070 av_free_packet(pkt);
1071 if(pkt->flags&AV_PKT_FLAG_KEY){
1072 i= pkt->stream_index;
1073
1074 asf_st= s->streams[i]->priv_data;
1075
1076 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1077 pos= asf_st->packet_pos;
1078
1079 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1080 start_pos[i]= asf_st->packet_pos + 1;
1081
1082 if(pkt->stream_index == stream_index)
1083 break;
1084 }
1085 }
1086
1087 *ppos= pos;
1088 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1089
1090 return pts;
1091 }
1092
1093 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1094 {
1095 ff_asf_guid g;
1096 ASFContext *asf = s->priv_data;
1097 int64_t current_pos= url_ftell(s->pb);
1098 int i;
1099
1100 url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1101 get_guid(s->pb, &g);
1102 if (!guidcmp(&g, &index_guid)) {
1103 int64_t itime, last_pos=-1;
1104 int pct, ict;
1105 int64_t av_unused gsize= get_le64(s->pb);
1106 get_guid(s->pb, &g);
1107 itime=get_le64(s->pb);
1108 pct=get_le32(s->pb);
1109 ict=get_le32(s->pb);
1110 av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1111
1112 for (i=0;i<ict;i++){
1113 int pktnum=get_le32(s->pb);
1114 int pktct =get_le16(s->pb);
1115 int64_t pos = s->data_offset + s->packet_size*(int64_t)pktnum;
1116 int64_t index_pts= av_rescale(itime, i, 10000);
1117
1118 if(pos != last_pos){
1119 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1120 av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1121 last_pos=pos;
1122 }
1123 }
1124 asf->index_read= 1;
1125 }
1126 url_fseek(s->pb, current_pos, SEEK_SET);
1127 }
1128
1129 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1130 {
1131 ASFContext *asf = s->priv_data;
1132 AVStream *st = s->streams[stream_index];
1133 int64_t pos;
1134 int index;
1135
1136 if (s->packet_size <= 0)
1137 return -1;
1138
1139 /* Try using the protocol's read_seek if available */
1140 if(s->pb) {
1141 int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1142 if(ret >= 0)
1143 asf_reset_header(s);
1144 if (ret != AVERROR(ENOSYS))
1145 return ret;
1146 }
1147
1148 if (!asf->index_read)
1149 asf_build_simple_index(s, stream_index);
1150
1151 if(!(asf->index_read && st->index_entries)){
1152 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1153 return -1;
1154 }else{
1155 index= av_index_search_timestamp(st, pts, flags);
1156 if(index<0)
1157 return -1;
1158
1159 /* find the position */
1160 pos = st->index_entries[index].pos;
1161
1162 // various attempts to find key frame have failed so far
1163 // asf_reset_header(s);
1164 // url_fseek(s->pb, pos, SEEK_SET);
1165 // key_pos = pos;
1166 // for(i=0;i<16;i++){
1167 // pos = url_ftell(s->pb);
1168 // if (av_read_frame(s, &pkt) < 0){
1169 // av_log(s, AV_LOG_INFO, "seek failed\n");
1170 // return -1;
1171 // }
1172 // asf_st = s->streams[stream_index]->priv_data;
1173 // pos += st->parser->frame_offset;
1174 //
1175 // if (pkt.size > b) {
1176 // b = pkt.size;
1177 // key_pos = pos;
1178 // }
1179 //
1180 // av_free_packet(&pkt);
1181 // }
1182
1183 /* do the seek */
1184 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1185 url_fseek(s->pb, pos, SEEK_SET);
1186 }
1187 asf_reset_header(s);
1188 return 0;
1189 }
1190
1191 AVInputFormat asf_demuxer = {
1192 "asf",
1193 NULL_IF_CONFIG_SMALL("ASF format"),
1194 sizeof(ASFContext),
1195 asf_probe,
1196 asf_read_header,
1197 asf_read_packet,
1198 asf_read_close,
1199 asf_read_seek,
1200 asf_read_pts,
1201 .metadata_conv = ff_asf_metadata_conv,
1202 };