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Ignore extradata & w/h in asf/dvr.
[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 ASF_MAX_STREAMS 127
39 #define FRAME_HEADER_SIZE 17
40 // Fix Me! FRAME_HEADER_SIZE may be different.
41
42 static const ff_asf_guid index_guid = {
43 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
44 };
45
46 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
47 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
48 };
49 /**********************************/
50 /* decoding */
51
52 static int guidcmp(const void *g1, const void *g2)
53 {
54 return memcmp(g1, g2, sizeof(ff_asf_guid));
55 }
56
57 #ifdef DEBUG
58 #define PRINT_IF_GUID(g,cmp) \
59 if (!guidcmp(g, &cmp)) \
60 dprintf(NULL, "(GUID: %s) ", #cmp)
61
62 static void print_guid(const ff_asf_guid *g)
63 {
64 int i;
65 PRINT_IF_GUID(g, ff_asf_header);
66 else PRINT_IF_GUID(g, ff_asf_file_header);
67 else PRINT_IF_GUID(g, ff_asf_stream_header);
68 else PRINT_IF_GUID(g, ff_asf_audio_stream);
69 else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
70 else PRINT_IF_GUID(g, ff_asf_video_stream);
71 else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
72 else PRINT_IF_GUID(g, ff_asf_command_stream);
73 else PRINT_IF_GUID(g, ff_asf_comment_header);
74 else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
75 else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
76 else PRINT_IF_GUID(g, ff_asf_data_header);
77 else PRINT_IF_GUID(g, index_guid);
78 else PRINT_IF_GUID(g, ff_asf_head1_guid);
79 else PRINT_IF_GUID(g, ff_asf_head2_guid);
80 else PRINT_IF_GUID(g, ff_asf_my_guid);
81 else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
82 else PRINT_IF_GUID(g, ff_asf_extended_content_header);
83 else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
84 else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
85 else PRINT_IF_GUID(g, ff_asf_metadata_header);
86 else PRINT_IF_GUID(g, ff_asf_marker_header);
87 else PRINT_IF_GUID(g, stream_bitrate_guid);
88 else PRINT_IF_GUID(g, ff_asf_language_guid);
89 else
90 dprintf(NULL, "(GUID: unknown) ");
91 for(i=0;i<16;i++)
92 dprintf(NULL, " 0x%02x,", (*g)[i]);
93 dprintf(NULL, "}\n");
94 }
95 #undef PRINT_IF_GUID
96 #else
97 #define print_guid(g)
98 #endif
99
100 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
101 {
102 assert(sizeof(*g) == 16);
103 get_buffer(s, *g, sizeof(*g));
104 }
105
106 #if 0
107 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
108 {
109 int len, c;
110 char *q;
111
112 len = get_le16(pb);
113 q = buf;
114 while (len > 0) {
115 c = get_le16(pb);
116 if ((q - buf) < buf_size - 1)
117 *q++ = c;
118 len--;
119 }
120 *q = '\0';
121 }
122 #endif
123
124 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
125 {
126 char* q = buf;
127 while (len > 1) {
128 uint8_t tmp;
129 uint32_t ch;
130
131 GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
132 PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
133 }
134 if (len > 0)
135 url_fskip(pb, len);
136 *q = '\0';
137 }
138
139 static int asf_probe(AVProbeData *pd)
140 {
141 /* check file header */
142 if (!guidcmp(pd->buf, &ff_asf_header))
143 return AVPROBE_SCORE_MAX;
144 else
145 return 0;
146 }
147
148 static int get_value(ByteIOContext *pb, int type){
149 switch(type){
150 case 2: return get_le32(pb);
151 case 3: return get_le32(pb);
152 case 4: return get_le64(pb);
153 case 5: return get_le16(pb);
154 default:return INT_MIN;
155 }
156 }
157
158 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
159 {
160 char *value;
161
162 if ((unsigned)len >= (UINT_MAX - 1)/2)
163 return;
164
165 value = av_malloc(2*len+1);
166 if (!value)
167 return;
168
169 if (type == 0) { // UTF16-LE
170 get_str16_nolen(s->pb, len, value, 2*len + 1);
171 } else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
172 uint64_t num = get_value(s->pb, type);
173 snprintf(value, len, "%"PRIu64, num);
174 } else {
175 url_fskip(s->pb, len);
176 av_freep(&value);
177 av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
178 return;
179 }
180 av_metadata_set2(&s->metadata, key, value, 0);
181 av_freep(&value);
182 }
183
184 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
185 {
186 ASFContext *asf = s->priv_data;
187 ff_asf_guid g;
188 ByteIOContext *pb = s->pb;
189 AVStream *st;
190 ASFStream *asf_st;
191 int size, i;
192 int64_t gsize;
193 AVRational dar[128];
194 uint32_t bitrate[128];
195
196 memset(dar, 0, sizeof(dar));
197 memset(bitrate, 0, sizeof(bitrate));
198
199 get_guid(pb, &g);
200 if (guidcmp(&g, &ff_asf_header))
201 return -1;
202 get_le64(pb);
203 get_le32(pb);
204 get_byte(pb);
205 get_byte(pb);
206 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
207 for(;;) {
208 uint64_t gpos= url_ftell(pb);
209 get_guid(pb, &g);
210 gsize = get_le64(pb);
211 dprintf(s, "%08"PRIx64": ", gpos);
212 print_guid(&g);
213 dprintf(s, " size=0x%"PRIx64"\n", gsize);
214 if (!guidcmp(&g, &ff_asf_data_header)) {
215 asf->data_object_offset = url_ftell(pb);
216 // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
217 if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
218 asf->data_object_size = gsize - 24;
219 } else {
220 asf->data_object_size = (uint64_t)-1;
221 }
222 break;
223 }
224 if (gsize < 24)
225 return -1;
226 if (!guidcmp(&g, &ff_asf_file_header)) {
227 get_guid(pb, &asf->hdr.guid);
228 asf->hdr.file_size = get_le64(pb);
229 asf->hdr.create_time = get_le64(pb);
230 asf->nb_packets = get_le64(pb);
231 asf->hdr.play_time = get_le64(pb);
232 asf->hdr.send_time = get_le64(pb);
233 asf->hdr.preroll = get_le32(pb);
234 asf->hdr.ignore = get_le32(pb);
235 asf->hdr.flags = get_le32(pb);
236 asf->hdr.min_pktsize = get_le32(pb);
237 asf->hdr.max_pktsize = get_le32(pb);
238 asf->hdr.max_bitrate = get_le32(pb);
239 s->packet_size = asf->hdr.max_pktsize;
240 } else if (!guidcmp(&g, &ff_asf_stream_header)) {
241 enum AVMediaType type;
242 int type_specific_size, sizeX;
243 uint64_t total_size;
244 unsigned int tag1;
245 int64_t pos1, pos2, start_time;
246 int test_for_ext_stream_audio, is_dvr_ms_audio=0;
247
248 if (s->nb_streams == ASF_MAX_STREAMS) {
249 av_log(s, AV_LOG_ERROR, "too many streams\n");
250 return AVERROR(EINVAL);
251 }
252
253 pos1 = url_ftell(pb);
254
255 st = av_new_stream(s, 0);
256 if (!st)
257 return AVERROR(ENOMEM);
258 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
259 asf_st = av_mallocz(sizeof(ASFStream));
260 if (!asf_st)
261 return AVERROR(ENOMEM);
262 st->priv_data = asf_st;
263 start_time = asf->hdr.preroll;
264
265 asf_st->stream_language_index = 128; // invalid stream index means no language info
266
267 if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
268 st->duration = asf->hdr.play_time /
269 (10000000 / 1000) - start_time;
270 }
271 get_guid(pb, &g);
272
273 test_for_ext_stream_audio = 0;
274 if (!guidcmp(&g, &ff_asf_audio_stream)) {
275 type = AVMEDIA_TYPE_AUDIO;
276 } else if (!guidcmp(&g, &ff_asf_video_stream)) {
277 type = AVMEDIA_TYPE_VIDEO;
278 } else if (!guidcmp(&g, &ff_asf_command_stream)) {
279 type = AVMEDIA_TYPE_DATA;
280 } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
281 test_for_ext_stream_audio = 1;
282 type = AVMEDIA_TYPE_UNKNOWN;
283 } else {
284 return -1;
285 }
286 get_guid(pb, &g);
287 total_size = get_le64(pb);
288 type_specific_size = get_le32(pb);
289 get_le32(pb);
290 st->id = get_le16(pb) & 0x7f; /* stream id */
291 // mapping of asf ID to AV stream ID;
292 asf->asfid2avid[st->id] = s->nb_streams - 1;
293
294 get_le32(pb);
295
296 if (test_for_ext_stream_audio) {
297 get_guid(pb, &g);
298 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
299 type = AVMEDIA_TYPE_AUDIO;
300 is_dvr_ms_audio=1;
301 get_guid(pb, &g);
302 get_le32(pb);
303 get_le32(pb);
304 get_le32(pb);
305 get_guid(pb, &g);
306 get_le32(pb);
307 }
308 }
309
310 st->codec->codec_type = type;
311 if (type == AVMEDIA_TYPE_AUDIO) {
312 ff_get_wav_header(pb, st->codec, type_specific_size);
313 if (is_dvr_ms_audio) {
314 // codec_id and codec_tag are unreliable in dvr_ms
315 // files. Set them later by probing stream.
316 st->codec->codec_id = CODEC_ID_PROBE;
317 st->codec->codec_tag = 0;
318 }
319 if (st->codec->codec_id == CODEC_ID_AAC) {
320 st->need_parsing = AVSTREAM_PARSE_NONE;
321 } else {
322 st->need_parsing = AVSTREAM_PARSE_FULL;
323 }
324 /* We have to init the frame size at some point .... */
325 pos2 = url_ftell(pb);
326 if (gsize >= (pos2 + 8 - pos1 + 24)) {
327 asf_st->ds_span = get_byte(pb);
328 asf_st->ds_packet_size = get_le16(pb);
329 asf_st->ds_chunk_size = get_le16(pb);
330 get_le16(pb); //ds_data_size
331 get_byte(pb); //ds_silence_data
332 }
333 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
334 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
335 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
336 if (asf_st->ds_span > 1) {
337 if (!asf_st->ds_chunk_size
338 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
339 || asf_st->ds_packet_size % asf_st->ds_chunk_size)
340 asf_st->ds_span = 0; // disable descrambling
341 }
342 switch (st->codec->codec_id) {
343 case CODEC_ID_MP3:
344 st->codec->frame_size = MPA_FRAME_SIZE;
345 break;
346 case CODEC_ID_PCM_S16LE:
347 case CODEC_ID_PCM_S16BE:
348 case CODEC_ID_PCM_U16LE:
349 case CODEC_ID_PCM_U16BE:
350 case CODEC_ID_PCM_S8:
351 case CODEC_ID_PCM_U8:
352 case CODEC_ID_PCM_ALAW:
353 case CODEC_ID_PCM_MULAW:
354 st->codec->frame_size = 1;
355 break;
356 default:
357 /* This is probably wrong, but it prevents a crash later */
358 st->codec->frame_size = 1;
359 break;
360 }
361 } else if (type == AVMEDIA_TYPE_VIDEO) {
362 get_le32(pb);
363 get_le32(pb);
364 get_byte(pb);
365 size = get_le16(pb); /* size */
366 sizeX= get_le32(pb); /* size */
367 st->codec->width = get_le32(pb);
368 st->codec->height = get_le32(pb);
369 /* not available for asf */
370 get_le16(pb); /* panes */
371 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
372 tag1 = get_le32(pb);
373 url_fskip(pb, 20);
374 // av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
375 size= sizeX;
376 if (size > 40) {
377 st->codec->extradata_size = size - 40;
378 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
379 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
380 }
381
382 /* Extract palette from extradata if bpp <= 8 */
383 /* This code assumes that extradata contains only palette */
384 /* This is true for all paletted codecs implemented in ffmpeg */
385 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
386 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
387 #if HAVE_BIGENDIAN
388 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
389 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
390 #else
391 memcpy(st->codec->palctrl->palette, st->codec->extradata,
392 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
393 #endif
394 st->codec->palctrl->palette_changed = 1;
395 }
396
397 st->codec->codec_tag = tag1;
398 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
399 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
400 st->need_parsing = AVSTREAM_PARSE_FULL;
401 // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
402 st->codec->width =
403 st->codec->height = 0;
404 av_freep(&st->codec->extradata);
405 st->codec->extradata_size=0;
406 }
407 if(st->codec->codec_id == CODEC_ID_H264)
408 st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
409 }
410 pos2 = url_ftell(pb);
411 url_fskip(pb, gsize - (pos2 - pos1 + 24));
412 } else if (!guidcmp(&g, &ff_asf_comment_header)) {
413 int len1, len2, len3, len4, len5;
414
415 len1 = get_le16(pb);
416 len2 = get_le16(pb);
417 len3 = get_le16(pb);
418 len4 = get_le16(pb);
419 len5 = get_le16(pb);
420 get_tag(s, "title" , 0, len1);
421 get_tag(s, "author" , 0, len2);
422 get_tag(s, "copyright", 0, len3);
423 get_tag(s, "comment" , 0, len4);
424 url_fskip(pb, len5);
425 } else if (!guidcmp(&g, &stream_bitrate_guid)) {
426 int stream_count = get_le16(pb);
427 int j;
428
429 // av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
430 // av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
431 for(j = 0; j < stream_count; j++) {
432 int flags, bitrate, stream_id;
433
434 flags= get_le16(pb);
435 bitrate= get_le32(pb);
436 stream_id= (flags & 0x7f);
437 // av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
438 asf->stream_bitrates[stream_id]= bitrate;
439 }
440 } else if (!guidcmp(&g, &ff_asf_language_guid)) {
441 int j;
442 int stream_count = get_le16(pb);
443 for(j = 0; j < stream_count; j++) {
444 char lang[6];
445 unsigned int lang_len = get_byte(pb);
446 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
447 if (j < 128)
448 av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
449 }
450 } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
451 int desc_count, i;
452
453 desc_count = get_le16(pb);
454 for(i=0;i<desc_count;i++) {
455 int name_len,value_type,value_len;
456 char name[1024];
457
458 name_len = get_le16(pb);
459 if (name_len%2) // must be even, broken lavf versions wrote len-1
460 name_len += 1;
461 get_str16_nolen(pb, name_len, name, sizeof(name));
462 value_type = get_le16(pb);
463 value_len = get_le16(pb);
464 if (!value_type && value_len%2)
465 value_len += 1;
466 get_tag(s, name, value_type, value_len);
467 }
468 } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
469 int n, stream_num, name_len, value_len, value_type, value_num;
470 n = get_le16(pb);
471
472 for(i=0;i<n;i++) {
473 char name[1024];
474
475 get_le16(pb); //lang_list_index
476 stream_num= get_le16(pb);
477 name_len= get_le16(pb);
478 value_type= get_le16(pb);
479 value_len= get_le32(pb);
480
481 get_str16_nolen(pb, name_len, name, sizeof(name));
482 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
483 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
484 url_fskip(pb, value_len - 2);
485
486 if(stream_num<128){
487 if (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
488 else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
489 }
490 }
491 } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
492 int ext_len, payload_ext_ct, stream_ct;
493 uint32_t ext_d, leak_rate, stream_num;
494 unsigned int stream_languageid_index;
495
496 get_le64(pb); // starttime
497 get_le64(pb); // endtime
498 leak_rate = get_le32(pb); // leak-datarate
499 get_le32(pb); // bucket-datasize
500 get_le32(pb); // init-bucket-fullness
501 get_le32(pb); // alt-leak-datarate
502 get_le32(pb); // alt-bucket-datasize
503 get_le32(pb); // alt-init-bucket-fullness
504 get_le32(pb); // max-object-size
505 get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
506 stream_num = get_le16(pb); // stream-num
507
508 stream_languageid_index = get_le16(pb); // stream-language-id-index
509 if (stream_num < 128)
510 asf->streams[stream_num].stream_language_index = stream_languageid_index;
511
512 get_le64(pb); // avg frametime in 100ns units
513 stream_ct = get_le16(pb); //stream-name-count
514 payload_ext_ct = get_le16(pb); //payload-extension-system-count
515
516 if (stream_num < 128)
517 bitrate[stream_num] = leak_rate;
518
519 for (i=0; i<stream_ct; i++){
520 get_le16(pb);
521 ext_len = get_le16(pb);
522 url_fseek(pb, ext_len, SEEK_CUR);
523 }
524
525 for (i=0; i<payload_ext_ct; i++){
526 get_guid(pb, &g);
527 ext_d=get_le16(pb);
528 ext_len=get_le32(pb);
529 url_fseek(pb, ext_len, SEEK_CUR);
530 }
531
532 // there could be a optional stream properties object to follow
533 // if so the next iteration will pick it up
534 continue;
535 } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
536 int v1, v2;
537 get_guid(pb, &g);
538 v1 = get_le32(pb);
539 v2 = get_le16(pb);
540 continue;
541 } else if (!guidcmp(&g, &ff_asf_marker_header)) {
542 int i, count, name_len;
543 char name[1024];
544
545 get_le64(pb); // reserved 16 bytes
546 get_le64(pb); // ...
547 count = get_le32(pb); // markers count
548 get_le16(pb); // reserved 2 bytes
549 name_len = get_le16(pb); // name length
550 for(i=0;i<name_len;i++){
551 get_byte(pb); // skip the name
552 }
553
554 for(i=0;i<count;i++){
555 int64_t pres_time;
556 int name_len;
557
558 get_le64(pb); // offset, 8 bytes
559 pres_time = get_le64(pb); // presentation time
560 get_le16(pb); // entry length
561 get_le32(pb); // send time
562 get_le32(pb); // flags
563 name_len = get_le32(pb); // name length
564 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
565 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
566 }
567 #if 0
568 } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
569 int len, v1, n, num;
570 char str[256], *q;
571 char tag[16];
572
573 get_guid(pb, &g);
574 print_guid(&g);
575
576 n = get_le32(pb);
577 for(i=0;i<n;i++) {
578 num = get_le16(pb); /* stream number */
579 get_str16(pb, str, sizeof(str));
580 get_str16(pb, str, sizeof(str));
581 len = get_le16(pb);
582 q = tag;
583 while (len > 0) {
584 v1 = get_byte(pb);
585 if ((q - tag) < sizeof(tag) - 1)
586 *q++ = v1;
587 len--;
588 }
589 *q = '\0';
590 }
591 #endif
592 } else if (url_feof(pb)) {
593 return -1;
594 } else {
595 if (!s->keylen) {
596 if (!guidcmp(&g, &ff_asf_content_encryption)) {
597 av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
598 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
599 av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
600 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
601 av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
602 }
603 }
604 }
605 if(url_ftell(pb) != gpos + gsize)
606 av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
607 url_fseek(pb, gpos + gsize, SEEK_SET);
608 }
609 get_guid(pb, &g);
610 get_le64(pb);
611 get_byte(pb);
612 get_byte(pb);
613 if (url_feof(pb))
614 return -1;
615 asf->data_offset = url_ftell(pb);
616 asf->packet_size_left = 0;
617
618
619 for(i=0; i<128; i++){
620 int stream_num= asf->asfid2avid[i];
621 if(stream_num>=0){
622 AVStream *st = s->streams[stream_num];
623 if (!st->codec->bit_rate)
624 st->codec->bit_rate = bitrate[i];
625 if (dar[i].num > 0 && dar[i].den > 0)
626 av_reduce(&st->sample_aspect_ratio.num,
627 &st->sample_aspect_ratio.den,
628 dar[i].num, dar[i].den, INT_MAX);
629 //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);
630
631 // copy and convert language codes to the frontend
632 if (asf->streams[i].stream_language_index < 128) {
633 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
634 if (rfc1766 && strlen(rfc1766) > 1) {
635 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
636 const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
637 if (iso6392)
638 av_metadata_set2(&st->metadata, "language", iso6392, 0);
639 }
640 }
641 }
642 }
643
644 return 0;
645 }
646
647 #define DO_2BITS(bits, var, defval) \
648 switch (bits & 3) \
649 { \
650 case 3: var = get_le32(pb); rsize += 4; break; \
651 case 2: var = get_le16(pb); rsize += 2; break; \
652 case 1: var = get_byte(pb); rsize++; break; \
653 default: var = defval; break; \
654 }
655
656 /**
657 * Load a single ASF packet into the demuxer.
658 * @param s demux context
659 * @param pb context to read data from
660 * @return 0 on success, <0 on error
661 */
662 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
663 {
664 ASFContext *asf = s->priv_data;
665 uint32_t packet_length, padsize;
666 int rsize = 8;
667 int c, d, e, off;
668
669 // if we do not know packet size, allow skipping up to 32 kB
670 off= 32768;
671 if (s->packet_size > 0)
672 off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
673
674 c=d=e=-1;
675 while(off-- > 0){
676 c=d; d=e;
677 e= get_byte(pb);
678 if(c == 0x82 && !d && !e)
679 break;
680 }
681
682 if (c != 0x82) {
683 /**
684 * This code allows handling of -EAGAIN at packet boundaries (i.e.
685 * if the packet sync code above triggers -EAGAIN). This does not
686 * imply complete -EAGAIN handling support at random positions in
687 * the stream.
688 */
689 if (url_ferror(pb) == AVERROR(EAGAIN))
690 return AVERROR(EAGAIN);
691 if (!url_feof(pb))
692 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
693 }
694 if ((c & 0x8f) == 0x82) {
695 if (d || e) {
696 if (!url_feof(pb))
697 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
698 return -1;
699 }
700 c= get_byte(pb);
701 d= get_byte(pb);
702 rsize+=3;
703 }else{
704 url_fseek(pb, -1, SEEK_CUR); //FIXME
705 }
706
707 asf->packet_flags = c;
708 asf->packet_property = d;
709
710 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
711 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
712 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
713
714 //the following checks prevent overflows and infinite loops
715 if(!packet_length || packet_length >= (1U<<29)){
716 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
717 return -1;
718 }
719 if(padsize >= packet_length){
720 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
721 return -1;
722 }
723
724 asf->packet_timestamp = get_le32(pb);
725 get_le16(pb); /* duration */
726 // rsize has at least 11 bytes which have to be present
727
728 if (asf->packet_flags & 0x01) {
729 asf->packet_segsizetype = get_byte(pb); rsize++;
730 asf->packet_segments = asf->packet_segsizetype & 0x3f;
731 } else {
732 asf->packet_segments = 1;
733 asf->packet_segsizetype = 0x80;
734 }
735 asf->packet_size_left = packet_length - padsize - rsize;
736 if (packet_length < asf->hdr.min_pktsize)
737 padsize += asf->hdr.min_pktsize - packet_length;
738 asf->packet_padsize = padsize;
739 dprintf(s, "packet: size=%d padsize=%d left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
740 return 0;
741 }
742
743 /**
744 *
745 * @return <0 if error
746 */
747 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
748 ASFContext *asf = s->priv_data;
749 int rsize = 1;
750 int num = get_byte(pb);
751 int64_t ts0, ts1;
752
753 asf->packet_segments--;
754 asf->packet_key_frame = num >> 7;
755 asf->stream_index = asf->asfid2avid[num & 0x7f];
756 // sequence should be ignored!
757 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
758 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
759 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
760 //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);
761 if (asf->packet_replic_size >= 8) {
762 asf->packet_obj_size = get_le32(pb);
763 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
764 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
765 return -1;
766 }
767 asf->packet_frag_timestamp = get_le32(pb); // timestamp
768 if(asf->packet_replic_size >= 8+38+4){
769 // for(i=0; i<asf->packet_replic_size-8; i++)
770 // av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
771 // av_log(s, AV_LOG_DEBUG, "\n");
772 url_fskip(pb, 10);
773 ts0= get_le64(pb);
774 ts1= get_le64(pb);
775 url_fskip(pb, 12);
776 get_le32(pb);
777 url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
778 if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
779 else asf->packet_frag_timestamp= AV_NOPTS_VALUE;
780 }else
781 url_fskip(pb, asf->packet_replic_size - 8);
782 rsize += asf->packet_replic_size; // FIXME - check validity
783 } else if (asf->packet_replic_size==1){
784 // multipacket - frag_offset is beginning timestamp
785 asf->packet_time_start = asf->packet_frag_offset;
786 asf->packet_frag_offset = 0;
787 asf->packet_frag_timestamp = asf->packet_timestamp;
788
789 asf->packet_time_delta = get_byte(pb);
790 rsize++;
791 }else if(asf->packet_replic_size!=0){
792 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
793 return -1;
794 }
795 if (asf->packet_flags & 0x01) {
796 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
797 if(asf->packet_frag_size > asf->packet_size_left - rsize){
798 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
799 return -1;
800 }
801 //printf("Fragsize %d\n", asf->packet_frag_size);
802 } else {
803 asf->packet_frag_size = asf->packet_size_left - rsize;
804 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
805 }
806 if (asf->packet_replic_size == 1) {
807 asf->packet_multi_size = asf->packet_frag_size;
808 if (asf->packet_multi_size > asf->packet_size_left)
809 return -1;
810 }
811 asf->packet_size_left -= rsize;
812 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
813
814 return 0;
815 }
816
817 /**
818 * Parse data from individual ASF packets (which were previously loaded
819 * with asf_get_packet()).
820 * @param s demux context
821 * @param pb context to read data from
822 * @param pkt pointer to store packet data into
823 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
824 * packets need to be loaded (through asf_get_packet())
825 */
826 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
827 {
828 ASFContext *asf = s->priv_data;
829 ASFStream *asf_st = 0;
830 for (;;) {
831 if(url_feof(pb))
832 return AVERROR_EOF;
833 if (asf->packet_size_left < FRAME_HEADER_SIZE
834 || asf->packet_segments < 1) {
835 //asf->packet_size_left <= asf->packet_padsize) {
836 int ret = asf->packet_size_left + asf->packet_padsize;
837 //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
838 assert(ret>=0);
839 /* fail safe */
840 url_fskip(pb, ret);
841
842 asf->packet_pos= url_ftell(pb);
843 if (asf->data_object_size != (uint64_t)-1 &&
844 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
845 return AVERROR_EOF; /* Do not exceed the size of the data object */
846 return 1;
847 }
848 if (asf->packet_time_start == 0) {
849 if(asf_read_frame_header(s, pb) < 0){
850 asf->packet_segments= 0;
851 continue;
852 }
853 if (asf->stream_index < 0
854 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
855 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
856 ) {
857 asf->packet_time_start = 0;
858 /* unhandled packet (should not happen) */
859 url_fskip(pb, asf->packet_frag_size);
860 asf->packet_size_left -= asf->packet_frag_size;
861 if(asf->stream_index < 0)
862 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
863 continue;
864 }
865 asf->asf_st = s->streams[asf->stream_index]->priv_data;
866 }
867 asf_st = asf->asf_st;
868
869 if (asf->packet_replic_size == 1) {
870 // frag_offset is here used as the beginning timestamp
871 asf->packet_frag_timestamp = asf->packet_time_start;
872 asf->packet_time_start += asf->packet_time_delta;
873 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
874 asf->packet_size_left--;
875 asf->packet_multi_size--;
876 if (asf->packet_multi_size < asf->packet_obj_size)
877 {
878 asf->packet_time_start = 0;
879 url_fskip(pb, asf->packet_multi_size);
880 asf->packet_size_left -= asf->packet_multi_size;
881 continue;
882 }
883 asf->packet_multi_size -= asf->packet_obj_size;
884 //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);
885 }
886 if( /*asf->packet_frag_size == asf->packet_obj_size*/
887 asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
888 && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
889 av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
890 asf_st->frag_offset, asf->packet_frag_size,
891 asf->packet_obj_size, asf_st->pkt.size);
892 asf->packet_obj_size= asf_st->pkt.size;
893 }
894
895 if ( asf_st->pkt.size != asf->packet_obj_size
896 || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
897 if(asf_st->pkt.data){
898 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
899 asf_st->frag_offset = 0;
900 av_free_packet(&asf_st->pkt);
901 }
902 /* new packet */
903 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
904 asf_st->seq = asf->packet_seq;
905 asf_st->pkt.dts = asf->packet_frag_timestamp;
906 asf_st->pkt.stream_index = asf->stream_index;
907 asf_st->pkt.pos =
908 asf_st->packet_pos= asf->packet_pos;
909 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
910 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
911 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
912 if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
913 asf->packet_key_frame = 1;
914 if (asf->packet_key_frame)
915 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
916 }
917
918 /* read data */
919 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
920 // s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
921 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
922 asf->packet_size_left -= asf->packet_frag_size;
923 if (asf->packet_size_left < 0)
924 continue;
925
926 if( asf->packet_frag_offset >= asf_st->pkt.size
927 || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
928 av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
929 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
930 continue;
931 }
932
933 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
934 asf->packet_frag_size);
935 if (s->key && s->keylen == 20)
936 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
937 asf->packet_frag_size);
938 asf_st->frag_offset += asf->packet_frag_size;
939 /* test if whole packet is read */
940 if (asf_st->frag_offset == asf_st->pkt.size) {
941 //workaround for macroshit radio DVR-MS files
942 if( s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
943 && asf_st->pkt.size > 100){
944 int i;
945 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
946 if(i == asf_st->pkt.size){
947 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
948 asf_st->frag_offset = 0;
949 av_free_packet(&asf_st->pkt);
950 continue;
951 }
952 }
953
954 /* return packet */
955 if (asf_st->ds_span > 1) {
956 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
957 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);
958 }else{
959 /* packet descrambling */
960 uint8_t *newdata = av_malloc(asf_st->pkt.size);
961 if (newdata) {
962 int offset = 0;
963 while (offset < asf_st->pkt.size) {
964 int off = offset / asf_st->ds_chunk_size;
965 int row = off / asf_st->ds_span;
966 int col = off % asf_st->ds_span;
967 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
968 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
969
970 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
971 assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
972 memcpy(newdata + offset,
973 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
974 asf_st->ds_chunk_size);
975 offset += asf_st->ds_chunk_size;
976 }
977 av_free(asf_st->pkt.data);
978 asf_st->pkt.data = newdata;
979 }
980 }
981 }
982 asf_st->frag_offset = 0;
983 *pkt= asf_st->pkt;
984 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
985 asf_st->pkt.size = 0;
986 asf_st->pkt.data = 0;
987 break; // packet completed
988 }
989 }
990 return 0;
991 }
992
993 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
994 {
995 ASFContext *asf = s->priv_data;
996
997 for (;;) {
998 int ret;
999
1000 /* parse cached packets, if any */
1001 if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1002 return ret;
1003 if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1004 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1005 asf->packet_time_start = 0;
1006 }
1007
1008 return 0;
1009 }
1010
1011 // Added to support seeking after packets have been read
1012 // If information is not reset, read_packet fails due to
1013 // leftover information from previous reads
1014 static void asf_reset_header(AVFormatContext *s)
1015 {
1016 ASFContext *asf = s->priv_data;
1017 ASFStream *asf_st;
1018 int i;
1019
1020 asf->packet_nb_frames = 0;
1021 asf->packet_size_left = 0;
1022 asf->packet_segments = 0;
1023 asf->packet_flags = 0;
1024 asf->packet_property = 0;
1025 asf->packet_timestamp = 0;
1026 asf->packet_segsizetype = 0;
1027 asf->packet_segments = 0;
1028 asf->packet_seq = 0;
1029 asf->packet_replic_size = 0;
1030 asf->packet_key_frame = 0;
1031 asf->packet_padsize = 0;
1032 asf->packet_frag_offset = 0;
1033 asf->packet_frag_size = 0;
1034 asf->packet_frag_timestamp = 0;
1035 asf->packet_multi_size = 0;
1036 asf->packet_obj_size = 0;
1037 asf->packet_time_delta = 0;
1038 asf->packet_time_start = 0;
1039
1040 for(i=0; i<s->nb_streams; i++){
1041 asf_st= s->streams[i]->priv_data;
1042 av_free_packet(&asf_st->pkt);
1043 asf_st->frag_offset=0;
1044 asf_st->seq=0;
1045 }
1046 asf->asf_st= NULL;
1047 }
1048
1049 static int asf_read_close(AVFormatContext *s)
1050 {
1051 int i;
1052
1053 asf_reset_header(s);
1054 for(i=0;i<s->nb_streams;i++) {
1055 AVStream *st = s->streams[i];
1056 av_free(st->codec->palctrl);
1057 }
1058 return 0;
1059 }
1060
1061 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1062 {
1063 AVPacket pkt1, *pkt = &pkt1;
1064 ASFStream *asf_st;
1065 int64_t pts;
1066 int64_t pos= *ppos;
1067 int i;
1068 int64_t start_pos[ASF_MAX_STREAMS];
1069
1070 for(i=0; i<s->nb_streams; i++){
1071 start_pos[i]= pos;
1072 }
1073
1074 if (s->packet_size > 0)
1075 pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1076 *ppos= pos;
1077 url_fseek(s->pb, pos, SEEK_SET);
1078
1079 //printf("asf_read_pts\n");
1080 asf_reset_header(s);
1081 for(;;){
1082 if (av_read_frame(s, pkt) < 0){
1083 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1084 return AV_NOPTS_VALUE;
1085 }
1086
1087 pts= pkt->pts;
1088
1089 av_free_packet(pkt);
1090 if(pkt->flags&AV_PKT_FLAG_KEY){
1091 i= pkt->stream_index;
1092
1093 asf_st= s->streams[i]->priv_data;
1094
1095 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1096 pos= asf_st->packet_pos;
1097
1098 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1099 start_pos[i]= asf_st->packet_pos + 1;
1100
1101 if(pkt->stream_index == stream_index)
1102 break;
1103 }
1104 }
1105
1106 *ppos= pos;
1107 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1108
1109 return pts;
1110 }
1111
1112 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1113 {
1114 ff_asf_guid g;
1115 ASFContext *asf = s->priv_data;
1116 int64_t current_pos= url_ftell(s->pb);
1117 int i;
1118
1119 url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1120 get_guid(s->pb, &g);
1121 if (!guidcmp(&g, &index_guid)) {
1122 int64_t itime, last_pos=-1;
1123 int pct, ict;
1124 int64_t av_unused gsize= get_le64(s->pb);
1125 get_guid(s->pb, &g);
1126 itime=get_le64(s->pb);
1127 pct=get_le32(s->pb);
1128 ict=get_le32(s->pb);
1129 av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1130
1131 for (i=0;i<ict;i++){
1132 int pktnum=get_le32(s->pb);
1133 int pktct =get_le16(s->pb);
1134 int64_t pos = s->data_offset + s->packet_size*(int64_t)pktnum;
1135 int64_t index_pts= av_rescale(itime, i, 10000);
1136
1137 if(pos != last_pos){
1138 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1139 av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1140 last_pos=pos;
1141 }
1142 }
1143 asf->index_read= 1;
1144 }
1145 url_fseek(s->pb, current_pos, SEEK_SET);
1146 }
1147
1148 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1149 {
1150 ASFContext *asf = s->priv_data;
1151 AVStream *st = s->streams[stream_index];
1152 int64_t pos;
1153 int index;
1154
1155 if (s->packet_size <= 0)
1156 return -1;
1157
1158 /* Try using the protocol's read_seek if available */
1159 if(s->pb) {
1160 int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1161 if(ret >= 0)
1162 asf_reset_header(s);
1163 if (ret != AVERROR(ENOSYS))
1164 return ret;
1165 }
1166
1167 if (!asf->index_read)
1168 asf_build_simple_index(s, stream_index);
1169
1170 if(!(asf->index_read && st->index_entries)){
1171 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1172 return -1;
1173 }else{
1174 index= av_index_search_timestamp(st, pts, flags);
1175 if(index<0)
1176 return -1;
1177
1178 /* find the position */
1179 pos = st->index_entries[index].pos;
1180
1181 // various attempts to find key frame have failed so far
1182 // asf_reset_header(s);
1183 // url_fseek(s->pb, pos, SEEK_SET);
1184 // key_pos = pos;
1185 // for(i=0;i<16;i++){
1186 // pos = url_ftell(s->pb);
1187 // if (av_read_frame(s, &pkt) < 0){
1188 // av_log(s, AV_LOG_INFO, "seek failed\n");
1189 // return -1;
1190 // }
1191 // asf_st = s->streams[stream_index]->priv_data;
1192 // pos += st->parser->frame_offset;
1193 //
1194 // if (pkt.size > b) {
1195 // b = pkt.size;
1196 // key_pos = pos;
1197 // }
1198 //
1199 // av_free_packet(&pkt);
1200 // }
1201
1202 /* do the seek */
1203 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1204 url_fseek(s->pb, pos, SEEK_SET);
1205 }
1206 asf_reset_header(s);
1207 return 0;
1208 }
1209
1210 AVInputFormat asf_demuxer = {
1211 "asf",
1212 NULL_IF_CONFIG_SMALL("ASF format"),
1213 sizeof(ASFContext),
1214 asf_probe,
1215 asf_read_header,
1216 asf_read_packet,
1217 asf_read_close,
1218 asf_read_seek,
1219 asf_read_pts,
1220 .metadata_conv = ff_asf_metadata_conv,
1221 };
Libav master