695cfeca75e51336e0e49163123fef853794c4f1
[libav.git] / libavformat / asf.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 #include "libavutil/common.h"
23 #include "libavcodec/mpegaudio.h"
24 #include "avformat.h"
25 #include "riff.h"
26 #include "asf.h"
27 #include "asfcrypt.h"
28
29 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
30
31 #undef NDEBUG
32 #include <assert.h>
33
34 #define FRAME_HEADER_SIZE 17
35 // Fix Me! FRAME_HEADER_SIZE may be different.
36
37 static const GUID index_guid = {
38 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
39 };
40
41 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
42 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
43 };
44 /**********************************/
45 /* decoding */
46
47 //#define DEBUG
48
49 #ifdef DEBUG
50 #define PRINT_IF_GUID(g,cmp) \
51 if (!memcmp(g, &cmp, sizeof(GUID))) \
52 dprintf(NULL, "(GUID: %s) ", #cmp)
53
54 static void print_guid(const GUID *g)
55 {
56 int i;
57 PRINT_IF_GUID(g, asf_header);
58 else PRINT_IF_GUID(g, file_header);
59 else PRINT_IF_GUID(g, stream_header);
60 else PRINT_IF_GUID(g, audio_stream);
61 else PRINT_IF_GUID(g, audio_conceal_none);
62 else PRINT_IF_GUID(g, video_stream);
63 else PRINT_IF_GUID(g, video_conceal_none);
64 else PRINT_IF_GUID(g, command_stream);
65 else PRINT_IF_GUID(g, comment_header);
66 else PRINT_IF_GUID(g, codec_comment_header);
67 else PRINT_IF_GUID(g, codec_comment1_header);
68 else PRINT_IF_GUID(g, data_header);
69 else PRINT_IF_GUID(g, index_guid);
70 else PRINT_IF_GUID(g, head1_guid);
71 else PRINT_IF_GUID(g, head2_guid);
72 else PRINT_IF_GUID(g, my_guid);
73 else PRINT_IF_GUID(g, ext_stream_header);
74 else PRINT_IF_GUID(g, extended_content_header);
75 else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
76 else PRINT_IF_GUID(g, ext_stream_audio_stream);
77 else PRINT_IF_GUID(g, metadata_header);
78 else PRINT_IF_GUID(g, stream_bitrate_guid);
79 else
80 dprintf(NULL, "(GUID: unknown) ");
81 for(i=0;i<16;i++)
82 dprintf(NULL, " 0x%02x,", (*g)[i]);
83 dprintf(NULL, "}\n");
84 }
85 #undef PRINT_IF_GUID
86 #else
87 #define print_guid(g)
88 #endif
89
90 static void get_guid(ByteIOContext *s, GUID *g)
91 {
92 assert(sizeof(*g) == 16);
93 get_buffer(s, *g, sizeof(*g));
94 }
95
96 #if 0
97 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
98 {
99 int len, c;
100 char *q;
101
102 len = get_le16(pb);
103 q = buf;
104 while (len > 0) {
105 c = get_le16(pb);
106 if ((q - buf) < buf_size - 1)
107 *q++ = c;
108 len--;
109 }
110 *q = '\0';
111 }
112 #endif
113
114 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
115 {
116 char* q = buf;
117 len /= 2;
118 while (len--) {
119 uint8_t tmp;
120 PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
121 }
122 *q = '\0';
123 }
124
125 static int asf_probe(AVProbeData *pd)
126 {
127 /* check file header */
128 if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
129 return AVPROBE_SCORE_MAX;
130 else
131 return 0;
132 }
133
134 static int get_value(ByteIOContext *pb, int type){
135 switch(type){
136 case 2: return get_le32(pb);
137 case 3: return get_le32(pb);
138 case 4: return get_le64(pb);
139 case 5: return get_le16(pb);
140 default:return INT_MIN;
141 }
142 }
143
144 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
145 {
146 ASFContext *asf = s->priv_data;
147 GUID g;
148 ByteIOContext *pb = s->pb;
149 AVStream *st;
150 ASFStream *asf_st;
151 int size, i;
152 int64_t gsize;
153 AVRational dar[128];
154 uint32_t bitrate[128];
155
156 memset(dar, 0, sizeof(dar));
157 memset(bitrate, 0, sizeof(bitrate));
158
159 get_guid(pb, &g);
160 if (memcmp(&g, &asf_header, sizeof(GUID)))
161 return -1;
162 get_le64(pb);
163 get_le32(pb);
164 get_byte(pb);
165 get_byte(pb);
166 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
167 for(;;) {
168 get_guid(pb, &g);
169 gsize = get_le64(pb);
170 dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
171 print_guid(&g);
172 dprintf(s, " size=0x%"PRIx64"\n", gsize);
173 if (!memcmp(&g, &data_header, sizeof(GUID))) {
174 asf->data_object_offset = url_ftell(pb);
175 // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
176 if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
177 asf->data_object_size = gsize - 24;
178 } else {
179 asf->data_object_size = (uint64_t)-1;
180 }
181 break;
182 }
183 if (gsize < 24)
184 return -1;
185 if (!memcmp(&g, &file_header, sizeof(GUID))) {
186 get_guid(pb, &asf->hdr.guid);
187 asf->hdr.file_size = get_le64(pb);
188 asf->hdr.create_time = get_le64(pb);
189 asf->nb_packets = get_le64(pb);
190 asf->hdr.play_time = get_le64(pb);
191 asf->hdr.send_time = get_le64(pb);
192 asf->hdr.preroll = get_le32(pb);
193 asf->hdr.ignore = get_le32(pb);
194 asf->hdr.flags = get_le32(pb);
195 asf->hdr.min_pktsize = get_le32(pb);
196 asf->hdr.max_pktsize = get_le32(pb);
197 asf->hdr.max_bitrate = get_le32(pb);
198 asf->packet_size = asf->hdr.max_pktsize;
199 } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
200 enum CodecType type;
201 int type_specific_size, sizeX;
202 uint64_t total_size;
203 unsigned int tag1;
204 int64_t pos1, pos2, start_time;
205 int test_for_ext_stream_audio, is_dvr_ms_audio=0;
206
207 pos1 = url_ftell(pb);
208
209 st = av_new_stream(s, 0);
210 if (!st)
211 return AVERROR(ENOMEM);
212 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
213 asf_st = av_mallocz(sizeof(ASFStream));
214 if (!asf_st)
215 return AVERROR(ENOMEM);
216 st->priv_data = asf_st;
217 start_time = asf->hdr.preroll;
218
219 if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
220 st->duration = asf->hdr.send_time /
221 (10000000 / 1000) - start_time;
222 }
223 get_guid(pb, &g);
224
225 test_for_ext_stream_audio = 0;
226 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
227 type = CODEC_TYPE_AUDIO;
228 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
229 type = CODEC_TYPE_VIDEO;
230 } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
231 type = CODEC_TYPE_DATA;
232 } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
233 test_for_ext_stream_audio = 1;
234 type = CODEC_TYPE_UNKNOWN;
235 } else {
236 return -1;
237 }
238 get_guid(pb, &g);
239 total_size = get_le64(pb);
240 type_specific_size = get_le32(pb);
241 get_le32(pb);
242 st->id = get_le16(pb) & 0x7f; /* stream id */
243 // mapping of asf ID to AV stream ID;
244 asf->asfid2avid[st->id] = s->nb_streams - 1;
245
246 get_le32(pb);
247
248 if (test_for_ext_stream_audio) {
249 get_guid(pb, &g);
250 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
251 type = CODEC_TYPE_AUDIO;
252 is_dvr_ms_audio=1;
253 get_guid(pb, &g);
254 get_le32(pb);
255 get_le32(pb);
256 get_le32(pb);
257 get_guid(pb, &g);
258 get_le32(pb);
259 }
260 }
261
262 st->codec->codec_type = type;
263 if (type == CODEC_TYPE_AUDIO) {
264 get_wav_header(pb, st->codec, type_specific_size);
265 if (is_dvr_ms_audio) {
266 // codec_id and codec_tag are unreliable in dvr_ms
267 // files. Set them later by probing stream.
268 st->codec->codec_id = CODEC_ID_PROBE;
269 st->codec->codec_tag = 0;
270 }
271 st->need_parsing = AVSTREAM_PARSE_FULL;
272 /* We have to init the frame size at some point .... */
273 pos2 = url_ftell(pb);
274 if (gsize >= (pos2 + 8 - pos1 + 24)) {
275 asf_st->ds_span = get_byte(pb);
276 asf_st->ds_packet_size = get_le16(pb);
277 asf_st->ds_chunk_size = get_le16(pb);
278 get_le16(pb); //ds_data_size
279 get_byte(pb); //ds_silence_data
280 }
281 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
282 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
283 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
284 if (asf_st->ds_span > 1) {
285 if (!asf_st->ds_chunk_size
286 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
287 || asf_st->ds_packet_size % asf_st->ds_chunk_size)
288 asf_st->ds_span = 0; // disable descrambling
289 }
290 switch (st->codec->codec_id) {
291 case CODEC_ID_MP3:
292 st->codec->frame_size = MPA_FRAME_SIZE;
293 break;
294 case CODEC_ID_PCM_S16LE:
295 case CODEC_ID_PCM_S16BE:
296 case CODEC_ID_PCM_U16LE:
297 case CODEC_ID_PCM_U16BE:
298 case CODEC_ID_PCM_S8:
299 case CODEC_ID_PCM_U8:
300 case CODEC_ID_PCM_ALAW:
301 case CODEC_ID_PCM_MULAW:
302 st->codec->frame_size = 1;
303 break;
304 default:
305 /* This is probably wrong, but it prevents a crash later */
306 st->codec->frame_size = 1;
307 break;
308 }
309 } else if (type == CODEC_TYPE_VIDEO) {
310 get_le32(pb);
311 get_le32(pb);
312 get_byte(pb);
313 size = get_le16(pb); /* size */
314 sizeX= get_le32(pb); /* size */
315 st->codec->width = get_le32(pb);
316 st->codec->height = get_le32(pb);
317 /* not available for asf */
318 get_le16(pb); /* panes */
319 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
320 tag1 = get_le32(pb);
321 url_fskip(pb, 20);
322 // av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
323 size= sizeX;
324 if (size > 40) {
325 st->codec->extradata_size = size - 40;
326 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
327 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
328 }
329
330 /* Extract palette from extradata if bpp <= 8 */
331 /* This code assumes that extradata contains only palette */
332 /* This is true for all paletted codecs implemented in ffmpeg */
333 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
334 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
335 #ifdef WORDS_BIGENDIAN
336 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
337 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
338 #else
339 memcpy(st->codec->palctrl->palette, st->codec->extradata,
340 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
341 #endif
342 st->codec->palctrl->palette_changed = 1;
343 }
344
345 st->codec->codec_tag = tag1;
346 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
347 if(tag1 == MKTAG('D', 'V', 'R', ' '))
348 st->need_parsing = AVSTREAM_PARSE_FULL;
349 }
350 pos2 = url_ftell(pb);
351 url_fskip(pb, gsize - (pos2 - pos1 + 24));
352 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
353 int len1, len2, len3, len4, len5;
354
355 len1 = get_le16(pb);
356 len2 = get_le16(pb);
357 len3 = get_le16(pb);
358 len4 = get_le16(pb);
359 len5 = get_le16(pb);
360 get_str16_nolen(pb, len1, s->title , sizeof(s->title));
361 get_str16_nolen(pb, len2, s->author , sizeof(s->author));
362 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
363 get_str16_nolen(pb, len4, s->comment , sizeof(s->comment));
364 url_fskip(pb, len5);
365 } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
366 int stream_count = get_le16(pb);
367 int j;
368
369 // av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
370 // av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
371 for(j = 0; j < stream_count; j++) {
372 int flags, bitrate, stream_id;
373
374 flags= get_le16(pb);
375 bitrate= get_le32(pb);
376 stream_id= (flags & 0x7f);
377 // av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
378 asf->stream_bitrates[stream_id]= bitrate;
379 }
380 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
381 int desc_count, i;
382
383 desc_count = get_le16(pb);
384 for(i=0;i<desc_count;i++)
385 {
386 int name_len,value_type,value_len;
387 uint64_t value_num = 0;
388 char name[1024];
389
390 name_len = get_le16(pb);
391 get_str16_nolen(pb, name_len, name, sizeof(name));
392 value_type = get_le16(pb);
393 value_len = get_le16(pb);
394 if (value_type <= 1) // unicode or byte
395 {
396 if (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
397 else if(!strcmp(name,"WM/Genre" )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
398 else if(!strcmp(name,"WM/Year" )) {
399 char year[8];
400 get_str16_nolen(pb, value_len, year, sizeof(year));
401 s->year = atoi(year);
402 }
403 else if(!strcmp(name,"WM/Track") && s->track == 0) {
404 char track[8];
405 get_str16_nolen(pb, value_len, track, sizeof(track));
406 s->track = strtol(track, NULL, 10) + 1;
407 }
408 else if(!strcmp(name,"WM/TrackNumber")) {
409 char track[8];
410 get_str16_nolen(pb, value_len, track, sizeof(track));
411 s->track = strtol(track, NULL, 10);
412 }
413 else url_fskip(pb, value_len);
414 }
415 else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
416 {
417 value_num= get_value(pb, value_type);
418 if (!strcmp(name,"WM/Track" ) && s->track == 0) s->track = value_num + 1;
419 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
420 }else
421 url_fskip(pb, value_len);
422 }
423 } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
424 int n, stream_num, name_len, value_len, value_type, value_num;
425 n = get_le16(pb);
426
427 for(i=0;i<n;i++) {
428 char name[1024];
429
430 get_le16(pb); //lang_list_index
431 stream_num= get_le16(pb);
432 name_len= get_le16(pb);
433 value_type= get_le16(pb);
434 value_len= get_le32(pb);
435
436 get_str16_nolen(pb, name_len, name, sizeof(name));
437 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
438 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
439 url_fskip(pb, value_len - 2);
440
441 if(stream_num<128){
442 if (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
443 else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
444 }
445 }
446 } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
447 int ext_len, payload_ext_ct, stream_ct;
448 uint32_t ext_d, leak_rate, stream_num;
449 int64_t pos_ex_st;
450 pos_ex_st = url_ftell(pb);
451
452 get_le64(pb); // starttime
453 get_le64(pb); // endtime
454 leak_rate = get_le32(pb); // leak-datarate
455 get_le32(pb); // bucket-datasize
456 get_le32(pb); // init-bucket-fullness
457 get_le32(pb); // alt-leak-datarate
458 get_le32(pb); // alt-bucket-datasize
459 get_le32(pb); // alt-init-bucket-fullness
460 get_le32(pb); // max-object-size
461 get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
462 stream_num = get_le16(pb); // stream-num
463 get_le16(pb); // stream-language-id-index
464 get_le64(pb); // avg frametime in 100ns units
465 stream_ct = get_le16(pb); //stream-name-count
466 payload_ext_ct = get_le16(pb); //payload-extension-system-count
467
468 if (stream_num < 128)
469 bitrate[stream_num] = leak_rate;
470
471 for (i=0; i<stream_ct; i++){
472 get_le16(pb);
473 ext_len = get_le16(pb);
474 url_fseek(pb, ext_len, SEEK_CUR);
475 }
476
477 for (i=0; i<payload_ext_ct; i++){
478 get_guid(pb, &g);
479 ext_d=get_le16(pb);
480 ext_len=get_le32(pb);
481 url_fseek(pb, ext_len, SEEK_CUR);
482 }
483
484 // there could be a optional stream properties object to follow
485 // if so the next iteration will pick it up
486 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
487 int v1, v2;
488 get_guid(pb, &g);
489 v1 = get_le32(pb);
490 v2 = get_le16(pb);
491 #if 0
492 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
493 int len, v1, n, num;
494 char str[256], *q;
495 char tag[16];
496
497 get_guid(pb, &g);
498 print_guid(&g);
499
500 n = get_le32(pb);
501 for(i=0;i<n;i++) {
502 num = get_le16(pb); /* stream number */
503 get_str16(pb, str, sizeof(str));
504 get_str16(pb, str, sizeof(str));
505 len = get_le16(pb);
506 q = tag;
507 while (len > 0) {
508 v1 = get_byte(pb);
509 if ((q - tag) < sizeof(tag) - 1)
510 *q++ = v1;
511 len--;
512 }
513 *q = '\0';
514 }
515 #endif
516 } else if (url_feof(pb)) {
517 return -1;
518 } else {
519 url_fseek(pb, gsize - 24, SEEK_CUR);
520 }
521 }
522 get_guid(pb, &g);
523 get_le64(pb);
524 get_byte(pb);
525 get_byte(pb);
526 if (url_feof(pb))
527 return -1;
528 asf->data_offset = url_ftell(pb);
529 asf->packet_size_left = 0;
530
531
532 for(i=0; i<128; i++){
533 int stream_num= asf->asfid2avid[i];
534 if(stream_num>=0){
535 AVStream *st = s->streams[stream_num];
536 if (!st->codec->bit_rate)
537 st->codec->bit_rate = bitrate[i];
538 if (dar[i].num > 0 && dar[i].den > 0)
539 av_reduce(&st->sample_aspect_ratio.num,
540 &st->sample_aspect_ratio.den,
541 dar[i].num, dar[i].den, INT_MAX);
542 //av_log(NULL, 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);
543 }
544 }
545
546 return 0;
547 }
548
549 #define DO_2BITS(bits, var, defval) \
550 switch (bits & 3) \
551 { \
552 case 3: var = get_le32(pb); rsize += 4; break; \
553 case 2: var = get_le16(pb); rsize += 2; break; \
554 case 1: var = get_byte(pb); rsize++; break; \
555 default: var = defval; break; \
556 }
557
558 /**
559 *
560 * @return <0 in case of an error
561 */
562 static int asf_get_packet(AVFormatContext *s)
563 {
564 ASFContext *asf = s->priv_data;
565 ByteIOContext *pb = s->pb;
566 uint32_t packet_length, padsize;
567 int rsize = 8;
568 int c, d, e, off;
569
570 off= (url_ftell(s->pb) - s->data_offset) % asf->packet_size + 3;
571
572 c=d=e=-1;
573 while(off-- > 0){
574 c=d; d=e;
575 e= get_byte(pb);
576 if(c == 0x82 && !d && !e)
577 break;
578 }
579
580 if (c != 0x82) {
581 if (!url_feof(pb))
582 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
583 }
584 if ((c & 0x8f) == 0x82) {
585 if (d || e) {
586 if (!url_feof(pb))
587 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
588 return -1;
589 }
590 c= get_byte(pb);
591 d= get_byte(pb);
592 rsize+=3;
593 }else{
594 url_fseek(pb, -1, SEEK_CUR); //FIXME
595 }
596
597 asf->packet_flags = c;
598 asf->packet_property = d;
599
600 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
601 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
602 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
603
604 //the following checks prevent overflows and infinite loops
605 if(packet_length >= (1U<<29)){
606 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
607 return -1;
608 }
609 if(padsize >= packet_length){
610 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
611 return -1;
612 }
613
614 asf->packet_timestamp = get_le32(pb);
615 get_le16(pb); /* duration */
616 // rsize has at least 11 bytes which have to be present
617
618 if (asf->packet_flags & 0x01) {
619 asf->packet_segsizetype = get_byte(pb); rsize++;
620 asf->packet_segments = asf->packet_segsizetype & 0x3f;
621 } else {
622 asf->packet_segments = 1;
623 asf->packet_segsizetype = 0x80;
624 }
625 asf->packet_size_left = packet_length - padsize - rsize;
626 if (packet_length < asf->hdr.min_pktsize)
627 padsize += asf->hdr.min_pktsize - packet_length;
628 asf->packet_padsize = padsize;
629 dprintf(s, "packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
630 return 0;
631 }
632
633 /**
634 *
635 * @return <0 if error
636 */
637 static int asf_read_frame_header(AVFormatContext *s){
638 ASFContext *asf = s->priv_data;
639 ByteIOContext *pb = s->pb;
640 int rsize = 1;
641 int num = get_byte(pb);
642 int64_t ts0, ts1;
643
644 asf->packet_segments--;
645 asf->packet_key_frame = num >> 7;
646 asf->stream_index = asf->asfid2avid[num & 0x7f];
647 // sequence should be ignored!
648 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
649 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
650 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
651 //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);
652 if (asf->packet_replic_size >= 8) {
653 asf->packet_obj_size = get_le32(pb);
654 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
655 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
656 return -1;
657 }
658 asf->packet_frag_timestamp = get_le32(pb); // timestamp
659 if(asf->packet_replic_size >= 8+38+4){
660 // for(i=0; i<asf->packet_replic_size-8; i++)
661 // av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
662 // av_log(s, AV_LOG_DEBUG, "\n");
663 url_fskip(pb, 10);
664 ts0= get_le64(pb);
665 ts1= get_le64(pb);
666 url_fskip(pb, 12);
667 get_le32(pb);
668 url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
669 if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
670 else asf->packet_frag_timestamp= AV_NOPTS_VALUE;
671 }else
672 url_fskip(pb, asf->packet_replic_size - 8);
673 rsize += asf->packet_replic_size; // FIXME - check validity
674 } else if (asf->packet_replic_size==1){
675 // multipacket - frag_offset is beginning timestamp
676 asf->packet_time_start = asf->packet_frag_offset;
677 asf->packet_frag_offset = 0;
678 asf->packet_frag_timestamp = asf->packet_timestamp;
679
680 asf->packet_time_delta = get_byte(pb);
681 rsize++;
682 }else if(asf->packet_replic_size!=0){
683 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
684 return -1;
685 }
686 if (asf->packet_flags & 0x01) {
687 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
688 if(asf->packet_frag_size > asf->packet_size_left - rsize){
689 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
690 return -1;
691 }
692 //printf("Fragsize %d\n", asf->packet_frag_size);
693 } else {
694 asf->packet_frag_size = asf->packet_size_left - rsize;
695 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
696 }
697 if (asf->packet_replic_size == 1) {
698 asf->packet_multi_size = asf->packet_frag_size;
699 if (asf->packet_multi_size > asf->packet_size_left)
700 return -1;
701 }
702 asf->packet_size_left -= rsize;
703 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
704
705 return 0;
706 }
707
708 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
709 {
710 ASFContext *asf = s->priv_data;
711 ASFStream *asf_st = 0;
712 ByteIOContext *pb = s->pb;
713 //static int pc = 0;
714 for (;;) {
715 if(url_feof(pb))
716 return AVERROR(EIO);
717 if (asf->packet_size_left < FRAME_HEADER_SIZE
718 || asf->packet_segments < 1) {
719 //asf->packet_size_left <= asf->packet_padsize) {
720 int ret = asf->packet_size_left + asf->packet_padsize;
721 //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
722 assert(ret>=0);
723 /* fail safe */
724 url_fskip(pb, ret);
725
726 asf->packet_pos= url_ftell(s->pb);
727 if (asf->data_object_size != (uint64_t)-1 &&
728 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
729 return AVERROR(EIO); /* Do not exceed the size of the data object */
730 ret = asf_get_packet(s);
731 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
732 if (ret < 0)
733 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
734 asf->packet_time_start = 0;
735 continue;
736 }
737 if (asf->packet_time_start == 0) {
738 if(asf_read_frame_header(s) < 0){
739 asf->packet_segments= 0;
740 continue;
741 }
742 if (asf->stream_index < 0
743 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
744 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
745 ) {
746 asf->packet_time_start = 0;
747 /* unhandled packet (should not happen) */
748 url_fskip(pb, asf->packet_frag_size);
749 asf->packet_size_left -= asf->packet_frag_size;
750 if(asf->stream_index < 0)
751 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
752 continue;
753 }
754 asf->asf_st = s->streams[asf->stream_index]->priv_data;
755 }
756 asf_st = asf->asf_st;
757
758 if (asf->packet_replic_size == 1) {
759 // frag_offset is here used as the beginning timestamp
760 asf->packet_frag_timestamp = asf->packet_time_start;
761 asf->packet_time_start += asf->packet_time_delta;
762 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
763 asf->packet_size_left--;
764 asf->packet_multi_size--;
765 if (asf->packet_multi_size < asf->packet_obj_size)
766 {
767 asf->packet_time_start = 0;
768 url_fskip(pb, asf->packet_multi_size);
769 asf->packet_size_left -= asf->packet_multi_size;
770 continue;
771 }
772 asf->packet_multi_size -= asf->packet_obj_size;
773 //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);
774 }
775 if( /*asf->packet_frag_size == asf->packet_obj_size*/
776 asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
777 && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
778 av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
779 asf_st->frag_offset, asf->packet_frag_size,
780 asf->packet_obj_size, asf_st->pkt.size);
781 asf->packet_obj_size= asf_st->pkt.size;
782 }
783
784 if ( asf_st->pkt.size != asf->packet_obj_size
785 || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
786 if(asf_st->pkt.data){
787 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
788 asf_st->frag_offset = 0;
789 av_free_packet(&asf_st->pkt);
790 }
791 /* new packet */
792 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
793 asf_st->seq = asf->packet_seq;
794 asf_st->pkt.dts = asf->packet_frag_timestamp;
795 asf_st->pkt.stream_index = asf->stream_index;
796 asf_st->pkt.pos =
797 asf_st->packet_pos= asf->packet_pos;
798 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
799 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
800 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
801 if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
802 asf->packet_key_frame = 1;
803 if (asf->packet_key_frame)
804 asf_st->pkt.flags |= PKT_FLAG_KEY;
805 }
806
807 /* read data */
808 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
809 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
810 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
811 asf->packet_size_left -= asf->packet_frag_size;
812 if (asf->packet_size_left < 0)
813 continue;
814
815 if( asf->packet_frag_offset >= asf_st->pkt.size
816 || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
817 av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
818 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
819 continue;
820 }
821
822 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
823 asf->packet_frag_size);
824 if (s->key && s->keylen == 20)
825 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
826 asf->packet_frag_size);
827 asf_st->frag_offset += asf->packet_frag_size;
828 /* test if whole packet is read */
829 if (asf_st->frag_offset == asf_st->pkt.size) {
830 //workaround for macroshit radio DVR-MS files
831 if( s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
832 && asf_st->pkt.size > 100){
833 int i;
834 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
835 if(i == asf_st->pkt.size){
836 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
837 asf_st->frag_offset = 0;
838 av_free_packet(&asf_st->pkt);
839 continue;
840 }
841 }
842
843 /* return packet */
844 if (asf_st->ds_span > 1) {
845 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
846 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);
847 }else{
848 /* packet descrambling */
849 uint8_t *newdata = av_malloc(asf_st->pkt.size);
850 if (newdata) {
851 int offset = 0;
852 while (offset < asf_st->pkt.size) {
853 int off = offset / asf_st->ds_chunk_size;
854 int row = off / asf_st->ds_span;
855 int col = off % asf_st->ds_span;
856 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
857 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
858
859 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
860 assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
861 memcpy(newdata + offset,
862 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
863 asf_st->ds_chunk_size);
864 offset += asf_st->ds_chunk_size;
865 }
866 av_free(asf_st->pkt.data);
867 asf_st->pkt.data = newdata;
868 }
869 }
870 }
871 asf_st->frag_offset = 0;
872 *pkt= asf_st->pkt;
873 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
874 asf_st->pkt.size = 0;
875 asf_st->pkt.data = 0;
876 break; // packet completed
877 }
878 }
879 return 0;
880 }
881
882 // Added to support seeking after packets have been read
883 // If information is not reset, read_packet fails due to
884 // leftover information from previous reads
885 static void asf_reset_header(AVFormatContext *s)
886 {
887 ASFContext *asf = s->priv_data;
888 ASFStream *asf_st;
889 int i;
890
891 asf->packet_nb_frames = 0;
892 asf->packet_size_left = 0;
893 asf->packet_segments = 0;
894 asf->packet_flags = 0;
895 asf->packet_property = 0;
896 asf->packet_timestamp = 0;
897 asf->packet_segsizetype = 0;
898 asf->packet_segments = 0;
899 asf->packet_seq = 0;
900 asf->packet_replic_size = 0;
901 asf->packet_key_frame = 0;
902 asf->packet_padsize = 0;
903 asf->packet_frag_offset = 0;
904 asf->packet_frag_size = 0;
905 asf->packet_frag_timestamp = 0;
906 asf->packet_multi_size = 0;
907 asf->packet_obj_size = 0;
908 asf->packet_time_delta = 0;
909 asf->packet_time_start = 0;
910
911 for(i=0; i<s->nb_streams; i++){
912 asf_st= s->streams[i]->priv_data;
913 av_free_packet(&asf_st->pkt);
914 asf_st->frag_offset=0;
915 asf_st->seq=0;
916 }
917 asf->asf_st= NULL;
918 }
919
920 static int asf_read_close(AVFormatContext *s)
921 {
922 int i;
923
924 asf_reset_header(s);
925 for(i=0;i<s->nb_streams;i++) {
926 AVStream *st = s->streams[i];
927 av_free(st->codec->palctrl);
928 }
929 return 0;
930 }
931
932 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
933 {
934 ASFContext *asf = s->priv_data;
935 AVPacket pkt1, *pkt = &pkt1;
936 ASFStream *asf_st;
937 int64_t pts;
938 int64_t pos= *ppos;
939 int i;
940 int64_t start_pos[s->nb_streams];
941
942 for(i=0; i<s->nb_streams; i++){
943 start_pos[i]= pos;
944 }
945
946 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
947 *ppos= pos;
948 url_fseek(s->pb, pos, SEEK_SET);
949
950 //printf("asf_read_pts\n");
951 asf_reset_header(s);
952 for(;;){
953 if (av_read_frame(s, pkt) < 0){
954 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
955 return AV_NOPTS_VALUE;
956 }
957
958 pts= pkt->pts;
959
960 av_free_packet(pkt);
961 if(pkt->flags&PKT_FLAG_KEY){
962 i= pkt->stream_index;
963
964 asf_st= s->streams[i]->priv_data;
965
966 // assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
967 pos= asf_st->packet_pos;
968
969 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
970 start_pos[i]= asf_st->packet_pos + 1;
971
972 if(pkt->stream_index == stream_index)
973 break;
974 }
975 }
976
977 *ppos= pos;
978 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
979
980 return pts;
981 }
982
983 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
984 {
985 GUID g;
986 ASFContext *asf = s->priv_data;
987 int64_t gsize, itime;
988 int64_t pos, current_pos, index_pts;
989 int i;
990 int pct,ict;
991
992 current_pos = url_ftell(s->pb);
993
994 url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
995 get_guid(s->pb, &g);
996 if (!memcmp(&g, &index_guid, sizeof(GUID))) {
997 gsize = get_le64(s->pb);
998 get_guid(s->pb, &g);
999 itime=get_le64(s->pb);
1000 pct=get_le32(s->pb);
1001 ict=get_le32(s->pb);
1002 av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1003
1004 for (i=0;i<ict;i++){
1005 int pktnum=get_le32(s->pb);
1006 int pktct =get_le16(s->pb);
1007 av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1008
1009 pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1010 index_pts=av_rescale(itime, i, 10000);
1011
1012 av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1013 }
1014 asf->index_read= 1;
1015 }
1016 url_fseek(s->pb, current_pos, SEEK_SET);
1017 }
1018
1019 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1020 {
1021 ASFContext *asf = s->priv_data;
1022 AVStream *st = s->streams[stream_index];
1023 int64_t pos;
1024 int index;
1025
1026 if (asf->packet_size <= 0)
1027 return -1;
1028
1029 /* Try using the protocol's read_seek if available */
1030 if(s->pb) {
1031 int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1032 if(ret >= 0)
1033 asf_reset_header(s);
1034 if (ret != AVERROR(ENOSYS))
1035 return ret;
1036 }
1037
1038 if (!asf->index_read)
1039 asf_build_simple_index(s, stream_index);
1040
1041 if(!(asf->index_read && st->index_entries)){
1042 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1043 return -1;
1044 }else{
1045 index= av_index_search_timestamp(st, pts, flags);
1046 if(index<0)
1047 return -1;
1048
1049 /* find the position */
1050 pos = st->index_entries[index].pos;
1051 pts = st->index_entries[index].timestamp;
1052
1053 // various attempts to find key frame have failed so far
1054 // asf_reset_header(s);
1055 // url_fseek(s->pb, pos, SEEK_SET);
1056 // key_pos = pos;
1057 // for(i=0;i<16;i++){
1058 // pos = url_ftell(s->pb);
1059 // if (av_read_frame(s, &pkt) < 0){
1060 // av_log(s, AV_LOG_INFO, "seek failed\n");
1061 // return -1;
1062 // }
1063 // asf_st = s->streams[stream_index]->priv_data;
1064 // pos += st->parser->frame_offset;
1065 //
1066 // if (pkt.size > b) {
1067 // b = pkt.size;
1068 // key_pos = pos;
1069 // }
1070 //
1071 // av_free_packet(&pkt);
1072 // }
1073
1074 /* do the seek */
1075 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1076 url_fseek(s->pb, pos, SEEK_SET);
1077 }
1078 asf_reset_header(s);
1079 return 0;
1080 }
1081
1082 AVInputFormat asf_demuxer = {
1083 "asf",
1084 NULL_IF_CONFIG_SMALL("ASF format"),
1085 sizeof(ASFContext),
1086 asf_probe,
1087 asf_read_header,
1088 asf_read_packet,
1089 asf_read_close,
1090 asf_read_seek,
1091 asf_read_pts,
1092 };