69c5e19c443f637aa1f233625123445f08a0d884
[libav.git] / libavformat / asf.c
1 /*
2 * ASF compatible decoder.
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 #include "avformat.h"
22 #include "riff.h"
23 #include "mpegaudio.h"
24 #include "asf.h"
25
26 #undef NDEBUG
27 #include <assert.h>
28
29 #define FRAME_HEADER_SIZE 17
30 // Fix Me! FRAME_HEADER_SIZE may be different.
31
32 static const GUID index_guid = {
33 0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
34 };
35
36 /**********************************/
37 /* decoding */
38
39 //#define DEBUG
40
41 #ifdef DEBUG
42 #define PRINT_IF_GUID(g,cmp) \
43 if (!memcmp(g, &cmp, sizeof(GUID))) \
44 printf("(GUID: %s) ", #cmp)
45
46 static void print_guid(const GUID *g)
47 {
48 int i;
49 PRINT_IF_GUID(g, asf_header);
50 else PRINT_IF_GUID(g, file_header);
51 else PRINT_IF_GUID(g, stream_header);
52 else PRINT_IF_GUID(g, audio_stream);
53 else PRINT_IF_GUID(g, audio_conceal_none);
54 else PRINT_IF_GUID(g, video_stream);
55 else PRINT_IF_GUID(g, video_conceal_none);
56 else PRINT_IF_GUID(g, command_stream);
57 else PRINT_IF_GUID(g, comment_header);
58 else PRINT_IF_GUID(g, codec_comment_header);
59 else PRINT_IF_GUID(g, codec_comment1_header);
60 else PRINT_IF_GUID(g, data_header);
61 else PRINT_IF_GUID(g, index_guid);
62 else PRINT_IF_GUID(g, head1_guid);
63 else PRINT_IF_GUID(g, head2_guid);
64 else PRINT_IF_GUID(g, my_guid);
65 else PRINT_IF_GUID(g, ext_stream_header);
66 else PRINT_IF_GUID(g, extended_content_header);
67 else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
68 else PRINT_IF_GUID(g, ext_stream_audio_stream);
69 else
70 printf("(GUID: unknown) ");
71 printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
72 for(i=0;i<8;i++)
73 printf(" 0x%02x,", g->v4[i]);
74 printf("}\n");
75 }
76 #undef PRINT_IF_GUID
77 #endif
78
79 static void get_guid(ByteIOContext *s, GUID *g)
80 {
81 int i;
82
83 g->v1 = get_le32(s);
84 g->v2 = get_le16(s);
85 g->v3 = get_le16(s);
86 for(i=0;i<8;i++)
87 g->v4[i] = get_byte(s);
88 }
89
90 #if 0
91 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
92 {
93 int len, c;
94 char *q;
95
96 len = get_le16(pb);
97 q = buf;
98 while (len > 0) {
99 c = get_le16(pb);
100 if ((q - buf) < buf_size - 1)
101 *q++ = c;
102 len--;
103 }
104 *q = '\0';
105 }
106 #endif
107
108 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
109 {
110 int c;
111 char *q;
112
113 q = buf;
114 while (len > 0) {
115 c = get_le16(pb);
116 if ((q - buf) < buf_size - 1)
117 *q++ = c;
118 len-=2;
119 }
120 *q = '\0';
121 }
122
123 static int asf_probe(AVProbeData *pd)
124 {
125 GUID g;
126 const unsigned char *p;
127 int i;
128
129 /* check file header */
130 if (pd->buf_size <= 32)
131 return 0;
132 p = pd->buf;
133 g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
134 p += 4;
135 g.v2 = p[0] | (p[1] << 8);
136 p += 2;
137 g.v3 = p[0] | (p[1] << 8);
138 p += 2;
139 for(i=0;i<8;i++)
140 g.v4[i] = *p++;
141
142 if (!memcmp(&g, &asf_header, sizeof(GUID)))
143 return AVPROBE_SCORE_MAX;
144 else
145 return 0;
146 }
147
148 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
149 {
150 ASFContext *asf = s->priv_data;
151 GUID g;
152 ByteIOContext *pb = &s->pb;
153 AVStream *st;
154 ASFStream *asf_st;
155 int size, i;
156 int64_t gsize;
157
158 get_guid(pb, &g);
159 if (memcmp(&g, &asf_header, sizeof(GUID)))
160 goto fail;
161 get_le64(pb);
162 get_le32(pb);
163 get_byte(pb);
164 get_byte(pb);
165 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
166 for(;;) {
167 get_guid(pb, &g);
168 gsize = get_le64(pb);
169 #ifdef DEBUG
170 printf("%08Lx: ", url_ftell(pb) - 24);
171 print_guid(&g);
172 printf(" size=0x%Lx\n", gsize);
173 #endif
174 if (gsize < 24)
175 goto fail;
176 if (!memcmp(&g, &file_header, sizeof(GUID))) {
177 get_guid(pb, &asf->hdr.guid);
178 asf->hdr.file_size = get_le64(pb);
179 asf->hdr.create_time = get_le64(pb);
180 asf->hdr.packets_count = get_le64(pb);
181 asf->hdr.send_time = get_le64(pb);
182 asf->hdr.play_time = get_le64(pb);
183 asf->hdr.preroll = get_le32(pb);
184 asf->hdr.ignore = get_le32(pb);
185 asf->hdr.flags = get_le32(pb);
186 asf->hdr.min_pktsize = get_le32(pb);
187 asf->hdr.max_pktsize = get_le32(pb);
188 asf->hdr.max_bitrate = get_le32(pb);
189 asf->packet_size = asf->hdr.max_pktsize;
190 asf->nb_packets = asf->hdr.packets_count;
191 } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
192 int type, type_specific_size, sizeX;
193 uint64_t total_size;
194 unsigned int tag1;
195 int64_t pos1, pos2;
196 int test_for_ext_stream_audio;
197
198 pos1 = url_ftell(pb);
199
200 st = av_new_stream(s, 0);
201 if (!st)
202 goto fail;
203 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
204 asf_st = av_mallocz(sizeof(ASFStream));
205 if (!asf_st)
206 goto fail;
207 st->priv_data = asf_st;
208 st->start_time = asf->hdr.preroll;
209 st->duration = asf->hdr.send_time /
210 (10000000 / 1000) - st->start_time;
211 get_guid(pb, &g);
212
213 test_for_ext_stream_audio = 0;
214 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
215 type = CODEC_TYPE_AUDIO;
216 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
217 type = CODEC_TYPE_VIDEO;
218 } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
219 type = CODEC_TYPE_UNKNOWN;
220 } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
221 test_for_ext_stream_audio = 1;
222 type = CODEC_TYPE_UNKNOWN;
223 } else {
224 goto fail;
225 }
226 get_guid(pb, &g);
227 total_size = get_le64(pb);
228 type_specific_size = get_le32(pb);
229 get_le32(pb);
230 st->id = get_le16(pb) & 0x7f; /* stream id */
231 // mapping of asf ID to AV stream ID;
232 asf->asfid2avid[st->id] = s->nb_streams - 1;
233
234 get_le32(pb);
235
236 if (test_for_ext_stream_audio) {
237 get_guid(pb, &g);
238 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
239 type = CODEC_TYPE_AUDIO;
240 get_guid(pb, &g);
241 get_le32(pb);
242 get_le32(pb);
243 get_le32(pb);
244 get_guid(pb, &g);
245 get_le32(pb);
246 }
247 }
248
249 st->codec->codec_type = type;
250 if (type == CODEC_TYPE_AUDIO) {
251 get_wav_header(pb, st->codec, type_specific_size);
252 st->need_parsing = 1;
253 /* We have to init the frame size at some point .... */
254 pos2 = url_ftell(pb);
255 if (gsize > (pos2 + 8 - pos1 + 24)) {
256 asf_st->ds_span = get_byte(pb);
257 asf_st->ds_packet_size = get_le16(pb);
258 asf_st->ds_chunk_size = get_le16(pb);
259 asf_st->ds_data_size = get_le16(pb);
260 asf_st->ds_silence_data = get_byte(pb);
261 }
262 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
263 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
264 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
265 if (asf_st->ds_span > 1) {
266 if (!asf_st->ds_chunk_size
267 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
268 asf_st->ds_span = 0; // disable descrambling
269 }
270 switch (st->codec->codec_id) {
271 case CODEC_ID_MP3:
272 st->codec->frame_size = MPA_FRAME_SIZE;
273 break;
274 case CODEC_ID_PCM_S16LE:
275 case CODEC_ID_PCM_S16BE:
276 case CODEC_ID_PCM_U16LE:
277 case CODEC_ID_PCM_U16BE:
278 case CODEC_ID_PCM_S8:
279 case CODEC_ID_PCM_U8:
280 case CODEC_ID_PCM_ALAW:
281 case CODEC_ID_PCM_MULAW:
282 st->codec->frame_size = 1;
283 break;
284 default:
285 /* This is probably wrong, but it prevents a crash later */
286 st->codec->frame_size = 1;
287 break;
288 }
289 } else if (type == CODEC_TYPE_VIDEO) {
290 get_le32(pb);
291 get_le32(pb);
292 get_byte(pb);
293 size = get_le16(pb); /* size */
294 sizeX= get_le32(pb); /* size */
295 st->codec->width = get_le32(pb);
296 st->codec->height = get_le32(pb);
297 /* not available for asf */
298 get_le16(pb); /* panes */
299 st->codec->bits_per_sample = get_le16(pb); /* depth */
300 tag1 = get_le32(pb);
301 url_fskip(pb, 20);
302 // av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
303 size= sizeX;
304 if (size > 40) {
305 st->codec->extradata_size = size - 40;
306 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
307 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
308 }
309
310 /* Extract palette from extradata if bpp <= 8 */
311 /* This code assumes that extradata contains only palette */
312 /* This is true for all paletted codecs implemented in ffmpeg */
313 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
314 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
315 #ifdef WORDS_BIGENDIAN
316 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
317 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
318 #else
319 memcpy(st->codec->palctrl->palette, st->codec->extradata,
320 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
321 #endif
322 st->codec->palctrl->palette_changed = 1;
323 }
324
325 st->codec->codec_tag = tag1;
326 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
327 if(tag1 == MKTAG('D', 'V', 'R', ' '))
328 st->need_parsing = 1;
329 }
330 pos2 = url_ftell(pb);
331 url_fskip(pb, gsize - (pos2 - pos1 + 24));
332 } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
333 asf->data_object_offset = url_ftell(pb);
334 if (gsize != (uint64_t)-1 && gsize >= 24) {
335 asf->data_object_size = gsize - 24;
336 } else {
337 asf->data_object_size = (uint64_t)-1;
338 }
339 break;
340 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
341 int len1, len2, len3, len4, len5;
342
343 len1 = get_le16(pb);
344 len2 = get_le16(pb);
345 len3 = get_le16(pb);
346 len4 = get_le16(pb);
347 len5 = get_le16(pb);
348 get_str16_nolen(pb, len1, s->title, sizeof(s->title));
349 get_str16_nolen(pb, len2, s->author, sizeof(s->author));
350 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
351 get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
352 url_fskip(pb, len5);
353 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
354 int desc_count, i;
355
356 desc_count = get_le16(pb);
357 for(i=0;i<desc_count;i++)
358 {
359 int name_len,value_type,value_len;
360 uint64_t value_num = 0;
361 char *name, *value;
362
363 name_len = get_le16(pb);
364 name = (char *)av_mallocz(name_len);
365 get_str16_nolen(pb, name_len, name, name_len);
366 value_type = get_le16(pb);
367 value_len = get_le16(pb);
368 if ((value_type == 0) || (value_type == 1)) // unicode or byte
369 {
370 value = (char *)av_mallocz(value_len);
371 get_str16_nolen(pb, value_len, value, value_len);
372 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
373 av_free(value);
374 }
375 if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
376 {
377 if (value_type==2) value_num = get_le32(pb);
378 if (value_type==3) value_num = get_le32(pb);
379 if (value_type==4) value_num = get_le64(pb);
380 if (value_type==5) value_num = get_le16(pb);
381 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
382 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
383 }
384 av_free(name);
385 }
386 } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
387 int ext_len, payload_ext_ct, stream_ct;
388 uint32_t ext_d;
389 int64_t pos_ex_st;
390 pos_ex_st = url_ftell(pb);
391
392 get_le64(pb);
393 get_le64(pb);
394 get_le32(pb);
395 get_le32(pb);
396 get_le32(pb);
397 get_le32(pb);
398 get_le32(pb);
399 get_le32(pb);
400 get_le32(pb);
401 get_le32(pb);
402 get_le16(pb);
403 get_le16(pb);
404 get_le64(pb);
405 stream_ct = get_le16(pb);
406 payload_ext_ct = get_le16(pb);
407
408 for (i=0; i<stream_ct; i++){
409 get_le16(pb);
410 ext_len = get_le16(pb);
411 url_fseek(pb, ext_len, SEEK_CUR);
412 }
413
414 for (i=0; i<payload_ext_ct; i++){
415 get_guid(pb, &g);
416 ext_d=get_le16(pb);
417 ext_len=get_le32(pb);
418 url_fseek(pb, ext_len, SEEK_CUR);
419 }
420
421 // there could be a optional stream properties object to follow
422 // if so the next iteration will pick it up
423 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
424 int v1, v2;
425 get_guid(pb, &g);
426 v1 = get_le32(pb);
427 v2 = get_le16(pb);
428 #if 0
429 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
430 int len, v1, n, num;
431 char str[256], *q;
432 char tag[16];
433
434 get_guid(pb, &g);
435 print_guid(&g);
436
437 n = get_le32(pb);
438 for(i=0;i<n;i++) {
439 num = get_le16(pb); /* stream number */
440 get_str16(pb, str, sizeof(str));
441 get_str16(pb, str, sizeof(str));
442 len = get_le16(pb);
443 q = tag;
444 while (len > 0) {
445 v1 = get_byte(pb);
446 if ((q - tag) < sizeof(tag) - 1)
447 *q++ = v1;
448 len--;
449 }
450 *q = '\0';
451 }
452 #endif
453 } else if (url_feof(pb)) {
454 goto fail;
455 } else {
456 url_fseek(pb, gsize - 24, SEEK_CUR);
457 }
458 }
459 get_guid(pb, &g);
460 get_le64(pb);
461 get_byte(pb);
462 get_byte(pb);
463 if (url_feof(pb))
464 goto fail;
465 asf->data_offset = url_ftell(pb);
466 asf->packet_size_left = 0;
467
468 return 0;
469
470 fail:
471 for(i=0;i<s->nb_streams;i++) {
472 AVStream *st = s->streams[i];
473 if (st) {
474 av_free(st->priv_data);
475 av_free(st->codec->extradata);
476 }
477 av_free(st);
478 }
479 return -1;
480 }
481
482 #define DO_2BITS(bits, var, defval) \
483 switch (bits & 3) \
484 { \
485 case 3: var = get_le32(pb); rsize += 4; break; \
486 case 2: var = get_le16(pb); rsize += 2; break; \
487 case 1: var = get_byte(pb); rsize++; break; \
488 default: var = defval; break; \
489 }
490
491 static int asf_get_packet(AVFormatContext *s)
492 {
493 ASFContext *asf = s->priv_data;
494 ByteIOContext *pb = &s->pb;
495 uint32_t packet_length, padsize;
496 int rsize = 9;
497 int c;
498
499 assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
500
501 c = get_byte(pb);
502 if (c != 0x82) {
503 if (!url_feof(pb))
504 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
505 }
506 if ((c & 0x0f) == 2) { // always true for now
507 if (get_le16(pb) != 0) {
508 if (!url_feof(pb))
509 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
510 return AVERROR_IO;
511 }
512 rsize+=2;
513 /* }else{
514 if (!url_feof(pb))
515 printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb));
516 return AVERROR_IO;*/
517 }
518
519 asf->packet_flags = get_byte(pb);
520 asf->packet_property = get_byte(pb);
521
522 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
523 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
524 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
525
526 //the following checks prevent overflows and infinite loops
527 if(packet_length >= (1U<<29)){
528 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
529 return 0; // FIXME this should be -1
530 }
531 if(padsize >= (1U<<29)){
532 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
533 return 0; // FIXME this should be -1
534 }
535
536 asf->packet_timestamp = get_le32(pb);
537 get_le16(pb); /* duration */
538 // rsize has at least 11 bytes which have to be present
539
540 if (asf->packet_flags & 0x01) {
541 asf->packet_segsizetype = get_byte(pb); rsize++;
542 asf->packet_segments = asf->packet_segsizetype & 0x3f;
543 } else {
544 asf->packet_segments = 1;
545 asf->packet_segsizetype = 0x80;
546 }
547 asf->packet_size_left = packet_length - padsize - rsize;
548 if (packet_length < asf->hdr.min_pktsize)
549 padsize += asf->hdr.min_pktsize - packet_length;
550 asf->packet_padsize = padsize;
551 #ifdef DEBUG
552 printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
553 #endif
554 return 0;
555 }
556
557 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
558 {
559 ASFContext *asf = s->priv_data;
560 ASFStream *asf_st = 0;
561 ByteIOContext *pb = &s->pb;
562 //static int pc = 0;
563 for (;;) {
564 int rsize = 0;
565 if (asf->packet_size_left < FRAME_HEADER_SIZE
566 || asf->packet_segments < 1) {
567 //asf->packet_size_left <= asf->packet_padsize) {
568 int ret = asf->packet_size_left + asf->packet_padsize;
569 //printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
570 if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
571 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
572 assert(ret>=0);
573 /* fail safe */
574 url_fskip(pb, ret);
575 asf->packet_pos= url_ftell(&s->pb);
576 if (asf->data_object_size != (uint64_t)-1 &&
577 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
578 return AVERROR_IO; /* Do not exceed the size of the data object */
579 ret = asf_get_packet(s);
580 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
581 if (ret < 0 || url_feof(pb))
582 return AVERROR_IO;
583 asf->packet_time_start = 0;
584 continue;
585 }
586 if (asf->packet_time_start == 0) {
587 /* read frame header */
588 int num = get_byte(pb);
589 asf->packet_segments--;
590 rsize++;
591 asf->packet_key_frame = (num & 0x80) >> 7;
592 asf->stream_index = asf->asfid2avid[num & 0x7f];
593 // sequence should be ignored!
594 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
595 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
596 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
597 //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);
598 if (asf->packet_replic_size > 1) {
599 assert(asf->packet_replic_size >= 8);
600 // it should be always at least 8 bytes - FIXME validate
601 asf->packet_obj_size = get_le32(pb);
602 asf->packet_frag_timestamp = get_le32(pb); // timestamp
603 if (asf->packet_replic_size > 8)
604 url_fskip(pb, asf->packet_replic_size - 8);
605 rsize += asf->packet_replic_size; // FIXME - check validity
606 } else if (asf->packet_replic_size==1){
607 // multipacket - frag_offset is begining timestamp
608 asf->packet_time_start = asf->packet_frag_offset;
609 asf->packet_frag_offset = 0;
610 asf->packet_frag_timestamp = asf->packet_timestamp;
611
612 asf->packet_time_delta = get_byte(pb);
613 rsize++;
614 }else{
615 assert(asf->packet_replic_size==0);
616 }
617 if (asf->packet_flags & 0x01) {
618 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
619 #undef DO_2BITS
620 //printf("Fragsize %d\n", asf->packet_frag_size);
621 } else {
622 asf->packet_frag_size = asf->packet_size_left - rsize;
623 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
624 }
625 if (asf->packet_replic_size == 1) {
626 asf->packet_multi_size = asf->packet_frag_size;
627 if (asf->packet_multi_size > asf->packet_size_left) {
628 asf->packet_segments = 0;
629 continue;
630 }
631 }
632 asf->packet_size_left -= rsize;
633 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
634
635 if (asf->stream_index < 0
636 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
637 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
638 ) {
639 asf->packet_time_start = 0;
640 /* unhandled packet (should not happen) */
641 url_fskip(pb, asf->packet_frag_size);
642 asf->packet_size_left -= asf->packet_frag_size;
643 if(asf->stream_index < 0)
644 av_log(s, AV_LOG_ERROR, "ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f);
645 continue;
646 }
647 asf->asf_st = s->streams[asf->stream_index]->priv_data;
648 }
649 asf_st = asf->asf_st;
650
651 if ((asf->packet_frag_offset != asf_st->frag_offset
652 || (asf->packet_frag_offset
653 && asf->packet_seq != asf_st->seq)) // seq should be ignored
654 ) {
655 /* cannot continue current packet: free it */
656 // FIXME better check if packet was already allocated
657 av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d o:%d - %d %d %d fl:%d\n",
658 asf_st->pkt.size,
659 asf->packet_obj_size,
660 asf->packet_frag_offset, asf_st->frag_offset,
661 asf->packet_seq, asf_st->seq, asf->packet_frag_size);
662 if (asf_st->pkt.size)
663 av_free_packet(&asf_st->pkt);
664 asf_st->frag_offset = 0;
665 if (asf->packet_frag_offset != 0) {
666 url_fskip(pb, asf->packet_frag_size);
667 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
668 asf->packet_size_left -= asf->packet_frag_size;
669 continue;
670 }
671 }
672 if (asf->packet_replic_size == 1) {
673 // frag_offset is here used as the begining timestamp
674 asf->packet_frag_timestamp = asf->packet_time_start;
675 asf->packet_time_start += asf->packet_time_delta;
676 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
677 asf->packet_size_left--;
678 asf->packet_multi_size--;
679 if (asf->packet_multi_size < asf->packet_obj_size)
680 {
681 asf->packet_time_start = 0;
682 url_fskip(pb, asf->packet_multi_size);
683 asf->packet_size_left -= asf->packet_multi_size;
684 continue;
685 }
686 asf->packet_multi_size -= asf->packet_obj_size;
687 //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);
688 }
689 if (asf_st->frag_offset == 0) {
690 /* new packet */
691 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
692 asf_st->seq = asf->packet_seq;
693 asf_st->pkt.pts = asf->packet_frag_timestamp;
694 asf_st->pkt.stream_index = asf->stream_index;
695 asf_st->pkt.pos =
696 asf_st->packet_pos= asf->packet_pos;
697 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
698 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
699 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
700 if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
701 asf->packet_key_frame = 1;
702 if (asf->packet_key_frame)
703 asf_st->pkt.flags |= PKT_FLAG_KEY;
704 }
705
706 /* read data */
707 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
708 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
709 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
710 asf->packet_size_left -= asf->packet_frag_size;
711 if (asf->packet_size_left < 0)
712 continue;
713 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
714 asf->packet_frag_size);
715 asf_st->frag_offset += asf->packet_frag_size;
716 /* test if whole packet is read */
717 if (asf_st->frag_offset == asf_st->pkt.size) {
718 /* return packet */
719 if (asf_st->ds_span > 1) {
720 /* packet descrambling */
721 uint8_t *newdata = av_malloc(asf_st->pkt.size);
722 if (newdata) {
723 int offset = 0;
724 while (offset < asf_st->pkt.size) {
725 int off = offset / asf_st->ds_chunk_size;
726 int row = off / asf_st->ds_span;
727 int col = off % asf_st->ds_span;
728 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
729 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
730 memcpy(newdata + offset,
731 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
732 asf_st->ds_chunk_size);
733 offset += asf_st->ds_chunk_size;
734 }
735 av_free(asf_st->pkt.data);
736 asf_st->pkt.data = newdata;
737 }
738 }
739 asf_st->frag_offset = 0;
740 memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
741 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
742 asf_st->pkt.size = 0;
743 asf_st->pkt.data = 0;
744 break; // packet completed
745 }
746 }
747 return 0;
748 }
749
750 static int asf_read_close(AVFormatContext *s)
751 {
752 int i;
753
754 for(i=0;i<s->nb_streams;i++) {
755 AVStream *st = s->streams[i];
756 av_free(st->priv_data);
757 av_free(st->codec->palctrl);
758 }
759 return 0;
760 }
761
762 // Added to support seeking after packets have been read
763 // If information is not reset, read_packet fails due to
764 // leftover information from previous reads
765 static void asf_reset_header(AVFormatContext *s)
766 {
767 ASFContext *asf = s->priv_data;
768 ASFStream *asf_st;
769 int i;
770
771 asf->packet_nb_frames = 0;
772 asf->packet_timestamp_start = -1;
773 asf->packet_timestamp_end = -1;
774 asf->packet_size_left = 0;
775 asf->packet_segments = 0;
776 asf->packet_flags = 0;
777 asf->packet_property = 0;
778 asf->packet_timestamp = 0;
779 asf->packet_segsizetype = 0;
780 asf->packet_segments = 0;
781 asf->packet_seq = 0;
782 asf->packet_replic_size = 0;
783 asf->packet_key_frame = 0;
784 asf->packet_padsize = 0;
785 asf->packet_frag_offset = 0;
786 asf->packet_frag_size = 0;
787 asf->packet_frag_timestamp = 0;
788 asf->packet_multi_size = 0;
789 asf->packet_obj_size = 0;
790 asf->packet_time_delta = 0;
791 asf->packet_time_start = 0;
792
793 for(i=0; i<s->nb_streams; i++){
794 asf_st= s->streams[i]->priv_data;
795 av_free_packet(&asf_st->pkt);
796 asf_st->frag_offset=0;
797 asf_st->seq=0;
798 }
799 asf->asf_st= NULL;
800 }
801
802 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
803 {
804 ASFContext *asf = s->priv_data;
805 AVPacket pkt1, *pkt = &pkt1;
806 ASFStream *asf_st;
807 int64_t pts;
808 int64_t pos= *ppos;
809 int i;
810 int64_t start_pos[s->nb_streams];
811
812 for(i=0; i<s->nb_streams; i++){
813 start_pos[i]= pos;
814 }
815
816 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
817 *ppos= pos;
818 url_fseek(&s->pb, pos, SEEK_SET);
819
820 //printf("asf_read_pts\n");
821 asf_reset_header(s);
822 for(;;){
823 if (av_read_frame(s, pkt) < 0){
824 av_log(s, AV_LOG_INFO, "seek failed\n");
825 return AV_NOPTS_VALUE;
826 }
827
828 pts= pkt->pts;
829
830 av_free_packet(pkt);
831 if(pkt->flags&PKT_FLAG_KEY){
832 i= pkt->stream_index;
833
834 asf_st= s->streams[i]->priv_data;
835
836 assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
837 pos= asf_st->packet_pos;
838
839 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
840 start_pos[i]= asf_st->packet_pos + 1;
841
842 if(pkt->stream_index == stream_index)
843 break;
844 }
845 }
846
847 *ppos= pos;
848 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
849
850 return pts;
851 }
852
853 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
854 {
855 GUID g;
856 ASFContext *asf = s->priv_data;
857 int64_t gsize, itime;
858 int64_t pos, current_pos, index_pts;
859 int i;
860 int pct,ict;
861
862 current_pos = url_ftell(&s->pb);
863
864 url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
865 get_guid(&s->pb, &g);
866 if (!memcmp(&g, &index_guid, sizeof(GUID))) {
867 gsize = get_le64(&s->pb);
868 get_guid(&s->pb, &g);
869 itime=get_le64(&s->pb);
870 pct=get_le32(&s->pb);
871 ict=get_le32(&s->pb);
872 av_log(NULL, AV_LOG_DEBUG, "itime:0x%Lx, pct:%d, ict:%d\n",itime,pct,ict);
873
874 for (i=0;i<ict;i++){
875 int pktnum=get_le32(&s->pb);
876 int pktct =get_le16(&s->pb);
877 av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
878
879 pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
880 index_pts=av_rescale(itime, i, 10000);
881
882 av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
883 }
884 asf->index_read= 1;
885 }
886 url_fseek(&s->pb, current_pos, SEEK_SET);
887 }
888
889 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
890 {
891 ASFContext *asf = s->priv_data;
892 AVStream *st = s->streams[stream_index];
893 int64_t pos;
894 int index;
895
896 if (asf->packet_size <= 0)
897 return -1;
898
899 if (!asf->index_read)
900 asf_build_simple_index(s, stream_index);
901
902 if(!(asf->index_read && st->index_entries)){
903 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
904 return -1;
905 }else{
906 index= av_index_search_timestamp(st, pts, flags);
907 if(index<0)
908 return -1;
909
910 /* find the position */
911 pos = st->index_entries[index].pos;
912 pts = st->index_entries[index].timestamp;
913
914 // various attempts to find key frame have failed so far
915 // asf_reset_header(s);
916 // url_fseek(&s->pb, pos, SEEK_SET);
917 // key_pos = pos;
918 // for(i=0;i<16;i++){
919 // pos = url_ftell(&s->pb);
920 // if (av_read_frame(s, &pkt) < 0){
921 // av_log(s, AV_LOG_INFO, "seek failed\n");
922 // return -1;
923 // }
924 // asf_st = s->streams[stream_index]->priv_data;
925 // pos += st->parser->frame_offset;
926 //
927 // if (pkt.size > b) {
928 // b = pkt.size;
929 // key_pos = pos;
930 // }
931 //
932 // av_free_packet(&pkt);
933 // }
934
935 /* do the seek */
936 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %Ld\n", pos);
937 url_fseek(&s->pb, pos, SEEK_SET);
938 }
939 asf_reset_header(s);
940 return 0;
941 }
942
943 AVInputFormat asf_demuxer = {
944 "asf",
945 "asf format",
946 sizeof(ASFContext),
947 asf_probe,
948 asf_read_header,
949 asf_read_packet,
950 asf_read_close,
951 asf_read_seek,
952 asf_read_pts,
953 };