various security fixes and precautionary checks
[libav.git] / libavformat / asf.c
1 /*
2 * ASF compatible decoder.
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include "avformat.h"
20 #include "avi.h"
21 #include "mpegaudio.h"
22 #include "asf.h"
23
24 #undef NDEBUG
25 #include <assert.h>
26
27 #define FRAME_HEADER_SIZE 17
28 // Fix Me! FRAME_HEADER_SIZE may be different.
29
30 static const GUID index_guid = {
31 0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
32 };
33
34 /**********************************/
35 /* decoding */
36
37 //#define DEBUG
38
39 #ifdef DEBUG
40 #define PRINT_IF_GUID(g,cmp) \
41 if (!memcmp(g, &cmp, sizeof(GUID))) \
42 printf("(GUID: %s) ", #cmp)
43
44 static void print_guid(const GUID *g)
45 {
46 int i;
47 PRINT_IF_GUID(g, asf_header);
48 else PRINT_IF_GUID(g, file_header);
49 else PRINT_IF_GUID(g, stream_header);
50 else PRINT_IF_GUID(g, audio_stream);
51 else PRINT_IF_GUID(g, audio_conceal_none);
52 else PRINT_IF_GUID(g, video_stream);
53 else PRINT_IF_GUID(g, video_conceal_none);
54 else PRINT_IF_GUID(g, comment_header);
55 else PRINT_IF_GUID(g, codec_comment_header);
56 else PRINT_IF_GUID(g, codec_comment1_header);
57 else PRINT_IF_GUID(g, data_header);
58 else PRINT_IF_GUID(g, index_guid);
59 else PRINT_IF_GUID(g, head1_guid);
60 else PRINT_IF_GUID(g, head2_guid);
61 else PRINT_IF_GUID(g, my_guid);
62 else
63 printf("(GUID: unknown) ");
64 printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
65 for(i=0;i<8;i++)
66 printf(" 0x%02x,", g->v4[i]);
67 printf("}\n");
68 }
69 #undef PRINT_IF_GUID(g,cmp)
70 #endif
71
72 static void get_guid(ByteIOContext *s, GUID *g)
73 {
74 int i;
75
76 g->v1 = get_le32(s);
77 g->v2 = get_le16(s);
78 g->v3 = get_le16(s);
79 for(i=0;i<8;i++)
80 g->v4[i] = get_byte(s);
81 }
82
83 #if 0
84 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
85 {
86 int len, c;
87 char *q;
88
89 len = get_le16(pb);
90 q = buf;
91 while (len > 0) {
92 c = get_le16(pb);
93 if ((q - buf) < buf_size - 1)
94 *q++ = c;
95 len--;
96 }
97 *q = '\0';
98 }
99 #endif
100
101 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
102 {
103 int c;
104 char *q;
105
106 q = buf;
107 while (len > 0) {
108 c = get_le16(pb);
109 if ((q - buf) < buf_size - 1)
110 *q++ = c;
111 len-=2;
112 }
113 *q = '\0';
114 }
115
116 static int asf_probe(AVProbeData *pd)
117 {
118 GUID g;
119 const unsigned char *p;
120 int i;
121
122 /* check file header */
123 if (pd->buf_size <= 32)
124 return 0;
125 p = pd->buf;
126 g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
127 p += 4;
128 g.v2 = p[0] | (p[1] << 8);
129 p += 2;
130 g.v3 = p[0] | (p[1] << 8);
131 p += 2;
132 for(i=0;i<8;i++)
133 g.v4[i] = *p++;
134
135 if (!memcmp(&g, &asf_header, sizeof(GUID)))
136 return AVPROBE_SCORE_MAX;
137 else
138 return 0;
139 }
140
141 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
142 {
143 ASFContext *asf = s->priv_data;
144 GUID g;
145 ByteIOContext *pb = &s->pb;
146 AVStream *st;
147 ASFStream *asf_st;
148 int size, i;
149 int64_t gsize;
150
151 get_guid(pb, &g);
152 if (memcmp(&g, &asf_header, sizeof(GUID)))
153 goto fail;
154 get_le64(pb);
155 get_le32(pb);
156 get_byte(pb);
157 get_byte(pb);
158 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
159 for(;;) {
160 get_guid(pb, &g);
161 gsize = get_le64(pb);
162 #ifdef DEBUG
163 printf("%08Lx: ", url_ftell(pb) - 24);
164 print_guid(&g);
165 printf(" size=0x%Lx\n", gsize);
166 #endif
167 if (gsize < 24)
168 goto fail;
169 if (!memcmp(&g, &file_header, sizeof(GUID))) {
170 get_guid(pb, &asf->hdr.guid);
171 asf->hdr.file_size = get_le64(pb);
172 asf->hdr.create_time = get_le64(pb);
173 asf->hdr.packets_count = get_le64(pb);
174 asf->hdr.play_time = get_le64(pb);
175 asf->hdr.send_time = get_le64(pb);
176 asf->hdr.preroll = get_le32(pb);
177 asf->hdr.ignore = get_le32(pb);
178 asf->hdr.flags = get_le32(pb);
179 asf->hdr.min_pktsize = get_le32(pb);
180 asf->hdr.max_pktsize = get_le32(pb);
181 asf->hdr.max_bitrate = get_le32(pb);
182 asf->packet_size = asf->hdr.max_pktsize;
183 asf->nb_packets = asf->hdr.packets_count;
184 } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
185 int type, total_size, type_specific_size;
186 unsigned int tag1;
187 int64_t pos1, pos2;
188
189 pos1 = url_ftell(pb);
190
191 st = av_new_stream(s, 0);
192 if (!st)
193 goto fail;
194 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
195 asf_st = av_mallocz(sizeof(ASFStream));
196 if (!asf_st)
197 goto fail;
198 st->priv_data = asf_st;
199 st->start_time = asf->hdr.preroll * (int64_t)AV_TIME_BASE / 1000;
200 st->duration = asf->hdr.send_time /
201 (10000000 / AV_TIME_BASE) - st->start_time;
202 get_guid(pb, &g);
203 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
204 type = CODEC_TYPE_AUDIO;
205 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
206 type = CODEC_TYPE_VIDEO;
207 } else {
208 goto fail;
209 }
210 get_guid(pb, &g);
211 total_size = get_le64(pb);
212 type_specific_size = get_le32(pb);
213 get_le32(pb);
214 st->id = get_le16(pb) & 0x7f; /* stream id */
215 // mapping of asf ID to AV stream ID;
216 asf->asfid2avid[st->id] = s->nb_streams - 1;
217
218 get_le32(pb);
219 st->codec.codec_type = type;
220 /* 1 fps default (XXX: put 0 fps instead) */
221 st->codec.frame_rate = 1000;
222 st->codec.frame_rate_base = 1;
223 if (type == CODEC_TYPE_AUDIO) {
224 get_wav_header(pb, &st->codec, type_specific_size);
225 st->need_parsing = 1;
226 /* We have to init the frame size at some point .... */
227 pos2 = url_ftell(pb);
228 if (gsize > (pos2 + 8 - pos1 + 24)) {
229 asf_st->ds_span = get_byte(pb);
230 asf_st->ds_packet_size = get_le16(pb);
231 asf_st->ds_chunk_size = get_le16(pb);
232 asf_st->ds_data_size = get_le16(pb);
233 asf_st->ds_silence_data = get_byte(pb);
234 }
235 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
236 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
237 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
238 if (asf_st->ds_span > 1) {
239 if (!asf_st->ds_chunk_size
240 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
241 asf_st->ds_span = 0; // disable descrambling
242 }
243 switch (st->codec.codec_id) {
244 case CODEC_ID_MP3:
245 st->codec.frame_size = MPA_FRAME_SIZE;
246 break;
247 case CODEC_ID_PCM_S16LE:
248 case CODEC_ID_PCM_S16BE:
249 case CODEC_ID_PCM_U16LE:
250 case CODEC_ID_PCM_U16BE:
251 case CODEC_ID_PCM_S8:
252 case CODEC_ID_PCM_U8:
253 case CODEC_ID_PCM_ALAW:
254 case CODEC_ID_PCM_MULAW:
255 st->codec.frame_size = 1;
256 break;
257 default:
258 /* This is probably wrong, but it prevents a crash later */
259 st->codec.frame_size = 1;
260 break;
261 }
262 } else {
263 get_le32(pb);
264 get_le32(pb);
265 get_byte(pb);
266 size = get_le16(pb); /* size */
267 get_le32(pb); /* size */
268 st->codec.width = get_le32(pb);
269 st->codec.height = get_le32(pb);
270 /* not available for asf */
271 get_le16(pb); /* panes */
272 st->codec.bits_per_sample = get_le16(pb); /* depth */
273 tag1 = get_le32(pb);
274 url_fskip(pb, 20);
275 if (size > 40) {
276 st->codec.extradata_size = size - 40;
277 st->codec.extradata = av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
278 get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
279 }
280
281 /* Extract palette from extradata if bpp <= 8 */
282 /* This code assumes that extradata contains only palette */
283 /* This is true for all paletted codecs implemented in ffmpeg */
284 if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
285 st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
286 #ifdef WORDS_BIGENDIAN
287 for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
288 st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
289 #else
290 memcpy(st->codec.palctrl->palette, st->codec.extradata,
291 FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
292 #endif
293 st->codec.palctrl->palette_changed = 1;
294 }
295
296 st->codec.codec_tag = tag1;
297 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
298 if(tag1 == MKTAG('D', 'V', 'R', ' '))
299 st->need_parsing = 1;
300 }
301 pos2 = url_ftell(pb);
302 url_fskip(pb, gsize - (pos2 - pos1 + 24));
303 } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
304 break;
305 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
306 int len1, len2, len3, len4, len5;
307
308 len1 = get_le16(pb);
309 len2 = get_le16(pb);
310 len3 = get_le16(pb);
311 len4 = get_le16(pb);
312 len5 = get_le16(pb);
313 get_str16_nolen(pb, len1, s->title, sizeof(s->title));
314 get_str16_nolen(pb, len2, s->author, sizeof(s->author));
315 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
316 get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
317 url_fskip(pb, len5);
318 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
319 int desc_count, i;
320
321 desc_count = get_le16(pb);
322 for(i=0;i<desc_count;i++)
323 {
324 int name_len,value_type,value_len,value_num = 0;
325 char *name, *value;
326
327 name_len = get_le16(pb);
328 name = (char *)av_mallocz(name_len);
329 get_str16_nolen(pb, name_len, name, name_len);
330 value_type = get_le16(pb);
331 value_len = get_le16(pb);
332 if ((value_type == 0) || (value_type == 1)) // unicode or byte
333 {
334 value = (char *)av_mallocz(value_len);
335 get_str16_nolen(pb, value_len, value, value_len);
336 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
337 av_free(value);
338 }
339 if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD
340 {
341 if (value_type==2) value_num = get_le32(pb);
342 if (value_type==3) value_num = get_le32(pb);
343 if (value_type==4) value_num = get_le64(pb);
344 if (value_type==5) value_num = get_le16(pb);
345 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
346 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
347 }
348 av_free(name);
349 }
350 #if 0
351 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
352 int v1, v2;
353 get_guid(pb, &g);
354 v1 = get_le32(pb);
355 v2 = get_le16(pb);
356 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
357 int len, v1, n, num;
358 char str[256], *q;
359 char tag[16];
360
361 get_guid(pb, &g);
362 print_guid(&g);
363
364 n = get_le32(pb);
365 for(i=0;i<n;i++) {
366 num = get_le16(pb); /* stream number */
367 get_str16(pb, str, sizeof(str));
368 get_str16(pb, str, sizeof(str));
369 len = get_le16(pb);
370 q = tag;
371 while (len > 0) {
372 v1 = get_byte(pb);
373 if ((q - tag) < sizeof(tag) - 1)
374 *q++ = v1;
375 len--;
376 }
377 *q = '\0';
378 }
379 #endif
380 } else if (url_feof(pb)) {
381 goto fail;
382 } else {
383 url_fseek(pb, gsize - 24, SEEK_CUR);
384 }
385 }
386 get_guid(pb, &g);
387 get_le64(pb);
388 get_byte(pb);
389 get_byte(pb);
390 if (url_feof(pb))
391 goto fail;
392 asf->data_offset = url_ftell(pb);
393 asf->packet_size_left = 0;
394
395 return 0;
396
397 fail:
398 for(i=0;i<s->nb_streams;i++) {
399 AVStream *st = s->streams[i];
400 if (st) {
401 av_free(st->priv_data);
402 av_free(st->codec.extradata);
403 }
404 av_free(st);
405 }
406 return -1;
407 }
408
409 #define DO_2BITS(bits, var, defval) \
410 switch (bits & 3) \
411 { \
412 case 3: var = get_le32(pb); rsize += 4; break; \
413 case 2: var = get_le16(pb); rsize += 2; break; \
414 case 1: var = get_byte(pb); rsize++; break; \
415 default: var = defval; break; \
416 }
417
418 static int asf_get_packet(AVFormatContext *s)
419 {
420 ASFContext *asf = s->priv_data;
421 ByteIOContext *pb = &s->pb;
422 uint32_t packet_length, padsize;
423 int rsize = 9;
424 int c;
425
426 if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size)
427 return -1;
428 assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
429
430 c = get_byte(pb);
431 if (c != 0x82) {
432 if (!url_feof(pb))
433 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%lld\n", c, url_ftell(pb));
434 }
435 if ((c & 0x0f) == 2) { // always true for now
436 if (get_le16(pb) != 0) {
437 if (!url_feof(pb))
438 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
439 return AVERROR_IO;
440 }
441 rsize+=2;
442 /* }else{
443 if (!url_feof(pb))
444 printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb));
445 return AVERROR_IO;*/
446 }
447
448 asf->packet_flags = get_byte(pb);
449 asf->packet_property = get_byte(pb);
450
451 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
452 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
453 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
454
455 asf->packet_timestamp = get_le32(pb);
456 get_le16(pb); /* duration */
457 // rsize has at least 11 bytes which have to be present
458
459 if (asf->packet_flags & 0x01) {
460 asf->packet_segsizetype = get_byte(pb); rsize++;
461 asf->packet_segments = asf->packet_segsizetype & 0x3f;
462 } else {
463 asf->packet_segments = 1;
464 asf->packet_segsizetype = 0x80;
465 }
466 asf->packet_size_left = packet_length - padsize - rsize;
467 if (packet_length < asf->hdr.min_pktsize)
468 padsize += asf->hdr.min_pktsize - packet_length;
469 asf->packet_padsize = padsize;
470 #ifdef DEBUG
471 printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
472 #endif
473 return 0;
474 }
475
476 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
477 {
478 ASFContext *asf = s->priv_data;
479 ASFStream *asf_st = 0;
480 ByteIOContext *pb = &s->pb;
481 //static int pc = 0;
482 for (;;) {
483 int rsize = 0;
484 if (asf->packet_size_left < FRAME_HEADER_SIZE
485 || asf->packet_segments < 1) {
486 //asf->packet_size_left <= asf->packet_padsize) {
487 int ret = asf->packet_size_left + asf->packet_padsize;
488 //printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
489 /* fail safe */
490 url_fskip(pb, ret);
491 asf->packet_pos= url_ftell(&s->pb);
492 ret = asf_get_packet(s);
493 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
494 if (ret < 0 || url_feof(pb))
495 return AVERROR_IO;
496 asf->packet_time_start = 0;
497 continue;
498 }
499 if (asf->packet_time_start == 0) {
500 /* read frame header */
501 int num = get_byte(pb);
502 asf->packet_segments--;
503 rsize++;
504 asf->packet_key_frame = (num & 0x80) >> 7;
505 asf->stream_index = asf->asfid2avid[num & 0x7f];
506 // sequence should be ignored!
507 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
508 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
509 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
510 //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);
511 if (asf->packet_replic_size > 1) {
512 assert(asf->packet_replic_size >= 8);
513 // it should be always at least 8 bytes - FIXME validate
514 asf->packet_obj_size = get_le32(pb);
515 asf->packet_frag_timestamp = get_le32(pb); // timestamp
516 if (asf->packet_replic_size > 8)
517 url_fskip(pb, asf->packet_replic_size - 8);
518 rsize += asf->packet_replic_size; // FIXME - check validity
519 } else if (asf->packet_replic_size==1){
520 // multipacket - frag_offset is begining timestamp
521 asf->packet_time_start = asf->packet_frag_offset;
522 asf->packet_frag_offset = 0;
523 asf->packet_frag_timestamp = asf->packet_timestamp;
524
525 asf->packet_time_delta = get_byte(pb);
526 rsize++;
527 }else{
528 assert(asf->packet_replic_size==0);
529 }
530 if (asf->packet_flags & 0x01) {
531 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
532 #undef DO_2BITS
533 //printf("Fragsize %d\n", asf->packet_frag_size);
534 } else {
535 asf->packet_frag_size = asf->packet_size_left - rsize;
536 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
537 }
538 if (asf->packet_replic_size == 1) {
539 asf->packet_multi_size = asf->packet_frag_size;
540 if (asf->packet_multi_size > asf->packet_size_left) {
541 asf->packet_segments = 0;
542 continue;
543 }
544 }
545 asf->packet_size_left -= rsize;
546 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
547
548 if (asf->stream_index < 0) {
549 asf->packet_time_start = 0;
550 /* unhandled packet (should not happen) */
551 url_fskip(pb, asf->packet_frag_size);
552 asf->packet_size_left -= asf->packet_frag_size;
553 av_log(s, AV_LOG_ERROR, "ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f);
554 continue;
555 }
556 asf->asf_st = s->streams[asf->stream_index]->priv_data;
557 }
558 asf_st = asf->asf_st;
559
560 if ((asf->packet_frag_offset != asf_st->frag_offset
561 || (asf->packet_frag_offset
562 && asf->packet_seq != asf_st->seq)) // seq should be ignored
563 ) {
564 /* cannot continue current packet: free it */
565 // FIXME better check if packet was already allocated
566 av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d o:%d - %d %d %d fl:%d\n",
567 asf_st->pkt.size,
568 asf->packet_obj_size,
569 asf->packet_frag_offset, asf_st->frag_offset,
570 asf->packet_seq, asf_st->seq, asf->packet_frag_size);
571 if (asf_st->pkt.size)
572 av_free_packet(&asf_st->pkt);
573 asf_st->frag_offset = 0;
574 if (asf->packet_frag_offset != 0) {
575 url_fskip(pb, asf->packet_frag_size);
576 av_log(s, AV_LOG_INFO, "ff asf parser skiping %db\n", asf->packet_frag_size);
577 asf->packet_size_left -= asf->packet_frag_size;
578 continue;
579 }
580 }
581 if (asf->packet_replic_size == 1) {
582 // frag_offset is here used as the begining timestamp
583 asf->packet_frag_timestamp = asf->packet_time_start;
584 asf->packet_time_start += asf->packet_time_delta;
585 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
586 asf->packet_size_left--;
587 asf->packet_multi_size--;
588 if (asf->packet_multi_size < asf->packet_obj_size)
589 {
590 asf->packet_time_start = 0;
591 url_fskip(pb, asf->packet_multi_size);
592 asf->packet_size_left -= asf->packet_multi_size;
593 continue;
594 }
595 asf->packet_multi_size -= asf->packet_obj_size;
596 //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);
597 }
598 if (asf_st->frag_offset == 0) {
599 /* new packet */
600 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
601 asf_st->seq = asf->packet_seq;
602 asf_st->pkt.pts = asf->packet_frag_timestamp;
603 asf_st->pkt.stream_index = asf->stream_index;
604 asf_st->packet_pos= asf->packet_pos;
605 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
606 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
607 //s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
608 if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO)
609 asf->packet_key_frame = 1;
610 if (asf->packet_key_frame)
611 asf_st->pkt.flags |= PKT_FLAG_KEY;
612 }
613
614 /* read data */
615 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
616 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
617 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
618 asf->packet_size_left -= asf->packet_frag_size;
619 if (asf->packet_size_left < 0)
620 continue;
621 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
622 asf->packet_frag_size);
623 asf_st->frag_offset += asf->packet_frag_size;
624 /* test if whole packet is read */
625 if (asf_st->frag_offset == asf_st->pkt.size) {
626 /* return packet */
627 if (asf_st->ds_span > 1) {
628 /* packet descrambling */
629 char* newdata = av_malloc(asf_st->pkt.size);
630 if (newdata) {
631 int offset = 0;
632 while (offset < asf_st->pkt.size) {
633 int off = offset / asf_st->ds_chunk_size;
634 int row = off / asf_st->ds_span;
635 int col = off % asf_st->ds_span;
636 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
637 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
638 memcpy(newdata + offset,
639 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
640 asf_st->ds_chunk_size);
641 offset += asf_st->ds_chunk_size;
642 }
643 av_free(asf_st->pkt.data);
644 asf_st->pkt.data = newdata;
645 }
646 }
647 asf_st->frag_offset = 0;
648 memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
649 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
650 asf_st->pkt.size = 0;
651 asf_st->pkt.data = 0;
652 break; // packet completed
653 }
654 }
655 return 0;
656 }
657
658 static int asf_read_close(AVFormatContext *s)
659 {
660 int i;
661
662 for(i=0;i<s->nb_streams;i++) {
663 AVStream *st = s->streams[i];
664 av_free(st->priv_data);
665 av_free(st->codec.extradata);
666 av_free(st->codec.palctrl);
667 }
668 return 0;
669 }
670
671 // Added to support seeking after packets have been read
672 // If information is not reset, read_packet fails due to
673 // leftover information from previous reads
674 static void asf_reset_header(AVFormatContext *s)
675 {
676 ASFContext *asf = s->priv_data;
677 ASFStream *asf_st;
678 int i;
679
680 asf->packet_nb_frames = 0;
681 asf->packet_timestamp_start = -1;
682 asf->packet_timestamp_end = -1;
683 asf->packet_size_left = 0;
684 asf->packet_segments = 0;
685 asf->packet_flags = 0;
686 asf->packet_property = 0;
687 asf->packet_timestamp = 0;
688 asf->packet_segsizetype = 0;
689 asf->packet_segments = 0;
690 asf->packet_seq = 0;
691 asf->packet_replic_size = 0;
692 asf->packet_key_frame = 0;
693 asf->packet_padsize = 0;
694 asf->packet_frag_offset = 0;
695 asf->packet_frag_size = 0;
696 asf->packet_frag_timestamp = 0;
697 asf->packet_multi_size = 0;
698 asf->packet_obj_size = 0;
699 asf->packet_time_delta = 0;
700 asf->packet_time_start = 0;
701
702 for(i=0; i<s->nb_streams; i++){
703 asf_st= s->streams[i]->priv_data;
704 av_free_packet(&asf_st->pkt);
705 asf_st->frag_offset=0;
706 asf_st->seq=0;
707 }
708 asf->asf_st= NULL;
709 }
710
711 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
712 {
713 ASFContext *asf = s->priv_data;
714 AVPacket pkt1, *pkt = &pkt1;
715 ASFStream *asf_st;
716 int64_t pts;
717 int64_t pos= *ppos;
718 int i;
719 int64_t start_pos[s->nb_streams];
720
721 for(i=0; i<s->nb_streams; i++){
722 start_pos[i]= pos;
723 }
724
725 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
726 *ppos= pos;
727 url_fseek(&s->pb, pos, SEEK_SET);
728
729 //printf("asf_read_pts\n");
730 asf_reset_header(s);
731 for(;;){
732 if (av_read_frame(s, pkt) < 0){
733 av_log(s, AV_LOG_INFO, "seek failed\n");
734 return AV_NOPTS_VALUE;
735 }
736
737 pts= pkt->pts * 1000 / AV_TIME_BASE;
738
739 av_free_packet(pkt);
740 if(pkt->flags&PKT_FLAG_KEY){
741 i= pkt->stream_index;
742
743 asf_st= s->streams[i]->priv_data;
744
745 assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
746 pos= asf_st->packet_pos;
747
748 av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
749 start_pos[i]= asf_st->packet_pos + 1;
750
751 if(pkt->stream_index == stream_index)
752 break;
753 }
754 }
755
756 *ppos= pos;
757 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
758
759 return pts;
760 }
761
762 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
763 {
764 ASFContext *asf = s->priv_data;
765
766 if (asf->packet_size <= 0)
767 return -1;
768
769 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
770 return -1;
771
772 asf_reset_header(s);
773 return 0;
774 }
775
776 static AVInputFormat asf_iformat = {
777 "asf",
778 "asf format",
779 sizeof(ASFContext),
780 asf_probe,
781 asf_read_header,
782 asf_read_packet,
783 asf_read_close,
784 asf_read_seek,
785 asf_read_pts,
786 };
787
788 #ifdef CONFIG_ENCODERS
789 extern AVOutputFormat asf_oformat;
790 extern AVOutputFormat asf_stream_oformat;
791 #endif //CONFIG_ENCODERS
792
793 int asf_init(void)
794 {
795 av_register_input_format(&asf_iformat);
796 #ifdef CONFIG_ENCODERS
797 av_register_output_format(&asf_oformat);
798 av_register_output_format(&asf_stream_oformat);
799 #endif //CONFIG_ENCODERS
800 return 0;
801 }