f4a920d3e7f1a8268105b747c1673b48c6800540
[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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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, command_stream);
55 else PRINT_IF_GUID(g, comment_header);
56 else PRINT_IF_GUID(g, codec_comment_header);
57 else PRINT_IF_GUID(g, codec_comment1_header);
58 else PRINT_IF_GUID(g, data_header);
59 else PRINT_IF_GUID(g, index_guid);
60 else PRINT_IF_GUID(g, head1_guid);
61 else PRINT_IF_GUID(g, head2_guid);
62 else PRINT_IF_GUID(g, my_guid);
63 else PRINT_IF_GUID(g, ext_stream_header);
64 else PRINT_IF_GUID(g, extended_content_header);
65 else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
66 else PRINT_IF_GUID(g, ext_stream_audio_stream);
67 else
68 printf("(GUID: unknown) ");
69 printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
70 for(i=0;i<8;i++)
71 printf(" 0x%02x,", g->v4[i]);
72 printf("}\n");
73 }
74 #undef PRINT_IF_GUID
75 #endif
76
77 static void get_guid(ByteIOContext *s, GUID *g)
78 {
79 int i;
80
81 g->v1 = get_le32(s);
82 g->v2 = get_le16(s);
83 g->v3 = get_le16(s);
84 for(i=0;i<8;i++)
85 g->v4[i] = get_byte(s);
86 }
87
88 #if 0
89 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
90 {
91 int len, c;
92 char *q;
93
94 len = get_le16(pb);
95 q = buf;
96 while (len > 0) {
97 c = get_le16(pb);
98 if ((q - buf) < buf_size - 1)
99 *q++ = c;
100 len--;
101 }
102 *q = '\0';
103 }
104 #endif
105
106 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
107 {
108 int c;
109 char *q;
110
111 q = buf;
112 while (len > 0) {
113 c = get_le16(pb);
114 if ((q - buf) < buf_size - 1)
115 *q++ = c;
116 len-=2;
117 }
118 *q = '\0';
119 }
120
121 static int asf_probe(AVProbeData *pd)
122 {
123 GUID g;
124 const unsigned char *p;
125 int i;
126
127 /* check file header */
128 if (pd->buf_size <= 32)
129 return 0;
130 p = pd->buf;
131 g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
132 p += 4;
133 g.v2 = p[0] | (p[1] << 8);
134 p += 2;
135 g.v3 = p[0] | (p[1] << 8);
136 p += 2;
137 for(i=0;i<8;i++)
138 g.v4[i] = *p++;
139
140 if (!memcmp(&g, &asf_header, sizeof(GUID)))
141 return AVPROBE_SCORE_MAX;
142 else
143 return 0;
144 }
145
146 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
147 {
148 ASFContext *asf = s->priv_data;
149 GUID g;
150 ByteIOContext *pb = &s->pb;
151 AVStream *st;
152 ASFStream *asf_st;
153 int size, i;
154 int64_t gsize;
155
156 get_guid(pb, &g);
157 if (memcmp(&g, &asf_header, sizeof(GUID)))
158 goto fail;
159 get_le64(pb);
160 get_le32(pb);
161 get_byte(pb);
162 get_byte(pb);
163 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
164 for(;;) {
165 get_guid(pb, &g);
166 gsize = get_le64(pb);
167 #ifdef DEBUG
168 printf("%08Lx: ", url_ftell(pb) - 24);
169 print_guid(&g);
170 printf(" size=0x%Lx\n", gsize);
171 #endif
172 if (gsize < 24)
173 goto fail;
174 if (!memcmp(&g, &file_header, sizeof(GUID))) {
175 get_guid(pb, &asf->hdr.guid);
176 asf->hdr.file_size = get_le64(pb);
177 asf->hdr.create_time = get_le64(pb);
178 asf->hdr.packets_count = get_le64(pb);
179 asf->hdr.send_time = get_le64(pb);
180 asf->hdr.play_time = get_le64(pb);
181 asf->hdr.preroll = get_le32(pb);
182 asf->hdr.ignore = get_le32(pb);
183 asf->hdr.flags = get_le32(pb);
184 asf->hdr.min_pktsize = get_le32(pb);
185 asf->hdr.max_pktsize = get_le32(pb);
186 asf->hdr.max_bitrate = get_le32(pb);
187 asf->packet_size = asf->hdr.max_pktsize;
188 asf->nb_packets = asf->hdr.packets_count;
189 } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
190 int type, total_size, type_specific_size, sizeX;
191 unsigned int tag1;
192 int64_t pos1, pos2;
193 int test_for_ext_stream_audio;
194
195 pos1 = url_ftell(pb);
196
197 st = av_new_stream(s, 0);
198 if (!st)
199 goto fail;
200 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
201 asf_st = av_mallocz(sizeof(ASFStream));
202 if (!asf_st)
203 goto fail;
204 st->priv_data = asf_st;
205 st->start_time = asf->hdr.preroll;
206 st->duration = asf->hdr.send_time /
207 (10000000 / 1000) - st->start_time;
208 get_guid(pb, &g);
209
210 test_for_ext_stream_audio = 0;
211 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
212 type = CODEC_TYPE_AUDIO;
213 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
214 type = CODEC_TYPE_VIDEO;
215 } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
216 type = CODEC_TYPE_UNKNOWN;
217 } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
218 test_for_ext_stream_audio = 1;
219 type = CODEC_TYPE_UNKNOWN;
220 } else {
221 goto fail;
222 }
223 get_guid(pb, &g);
224 total_size = get_le64(pb);
225 type_specific_size = get_le32(pb);
226 get_le32(pb);
227 st->id = get_le16(pb) & 0x7f; /* stream id */
228 // mapping of asf ID to AV stream ID;
229 asf->asfid2avid[st->id] = s->nb_streams - 1;
230
231 get_le32(pb);
232
233 if (test_for_ext_stream_audio) {
234 get_guid(pb, &g);
235 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
236 type = CODEC_TYPE_AUDIO;
237 get_guid(pb, &g);
238 get_le32(pb);
239 get_le32(pb);
240 get_le32(pb);
241 get_guid(pb, &g);
242 get_le32(pb);
243 }
244 }
245
246 st->codec->codec_type = type;
247 if (type == CODEC_TYPE_AUDIO) {
248 get_wav_header(pb, st->codec, type_specific_size);
249 st->need_parsing = 1;
250 /* We have to init the frame size at some point .... */
251 pos2 = url_ftell(pb);
252 if (gsize > (pos2 + 8 - pos1 + 24)) {
253 asf_st->ds_span = get_byte(pb);
254 asf_st->ds_packet_size = get_le16(pb);
255 asf_st->ds_chunk_size = get_le16(pb);
256 asf_st->ds_data_size = get_le16(pb);
257 asf_st->ds_silence_data = get_byte(pb);
258 }
259 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
260 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
261 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
262 if (asf_st->ds_span > 1) {
263 if (!asf_st->ds_chunk_size
264 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
265 asf_st->ds_span = 0; // disable descrambling
266 }
267 switch (st->codec->codec_id) {
268 case CODEC_ID_MP3:
269 st->codec->frame_size = MPA_FRAME_SIZE;
270 break;
271 case CODEC_ID_PCM_S16LE:
272 case CODEC_ID_PCM_S16BE:
273 case CODEC_ID_PCM_U16LE:
274 case CODEC_ID_PCM_U16BE:
275 case CODEC_ID_PCM_S8:
276 case CODEC_ID_PCM_U8:
277 case CODEC_ID_PCM_ALAW:
278 case CODEC_ID_PCM_MULAW:
279 st->codec->frame_size = 1;
280 break;
281 default:
282 /* This is probably wrong, but it prevents a crash later */
283 st->codec->frame_size = 1;
284 break;
285 }
286 } else if (type == CODEC_TYPE_VIDEO) {
287 get_le32(pb);
288 get_le32(pb);
289 get_byte(pb);
290 size = get_le16(pb); /* size */
291 sizeX= get_le32(pb); /* size */
292 st->codec->width = get_le32(pb);
293 st->codec->height = get_le32(pb);
294 /* not available for asf */
295 get_le16(pb); /* panes */
296 st->codec->bits_per_sample = get_le16(pb); /* depth */
297 tag1 = get_le32(pb);
298 url_fskip(pb, 20);
299 // av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
300 size= sizeX;
301 if (size > 40) {
302 st->codec->extradata_size = size - 40;
303 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
304 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
305 }
306
307 /* Extract palette from extradata if bpp <= 8 */
308 /* This code assumes that extradata contains only palette */
309 /* This is true for all paletted codecs implemented in ffmpeg */
310 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
311 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
312 #ifdef WORDS_BIGENDIAN
313 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
314 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
315 #else
316 memcpy(st->codec->palctrl->palette, st->codec->extradata,
317 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
318 #endif
319 st->codec->palctrl->palette_changed = 1;
320 }
321
322 st->codec->codec_tag = tag1;
323 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
324 if(tag1 == MKTAG('D', 'V', 'R', ' '))
325 st->need_parsing = 1;
326 }
327 pos2 = url_ftell(pb);
328 url_fskip(pb, gsize - (pos2 - pos1 + 24));
329 } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
330 break;
331 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
332 int len1, len2, len3, len4, len5;
333
334 len1 = get_le16(pb);
335 len2 = get_le16(pb);
336 len3 = get_le16(pb);
337 len4 = get_le16(pb);
338 len5 = get_le16(pb);
339 get_str16_nolen(pb, len1, s->title, sizeof(s->title));
340 get_str16_nolen(pb, len2, s->author, sizeof(s->author));
341 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
342 get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
343 url_fskip(pb, len5);
344 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
345 int desc_count, i;
346
347 desc_count = get_le16(pb);
348 for(i=0;i<desc_count;i++)
349 {
350 int name_len,value_type,value_len,value_num = 0;
351 char *name, *value;
352
353 name_len = get_le16(pb);
354 name = (char *)av_mallocz(name_len);
355 get_str16_nolen(pb, name_len, name, name_len);
356 value_type = get_le16(pb);
357 value_len = get_le16(pb);
358 if ((value_type == 0) || (value_type == 1)) // unicode or byte
359 {
360 value = (char *)av_mallocz(value_len);
361 get_str16_nolen(pb, value_len, value, value_len);
362 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
363 av_free(value);
364 }
365 if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
366 {
367 if (value_type==2) value_num = get_le32(pb);
368 if (value_type==3) value_num = get_le32(pb);
369 if (value_type==4) value_num = get_le64(pb);
370 if (value_type==5) value_num = get_le16(pb);
371 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
372 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
373 }
374 av_free(name);
375 }
376 } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
377 int ext_len, payload_ext_ct, stream_ct;
378 uint32_t ext_d;
379 int64_t pos_ex_st;
380 pos_ex_st = url_ftell(pb);
381
382 get_le64(pb);
383 get_le64(pb);
384 get_le32(pb);
385 get_le32(pb);
386 get_le32(pb);
387 get_le32(pb);
388 get_le32(pb);
389 get_le32(pb);
390 get_le32(pb);
391 get_le32(pb);
392 get_le16(pb);
393 get_le16(pb);
394 get_le64(pb);
395 stream_ct = get_le16(pb);
396 payload_ext_ct = get_le16(pb);
397
398 for (i=0; i<stream_ct; i++){
399 get_le16(pb);
400 ext_len = get_le16(pb);
401 url_fseek(pb, ext_len, SEEK_CUR);
402 }
403
404 for (i=0; i<payload_ext_ct; i++){
405 get_guid(pb, &g);
406 ext_d=get_le16(pb);
407 ext_len=get_le32(pb);
408 url_fseek(pb, ext_len, SEEK_CUR);
409 }
410
411 // there could be a optional stream properties object to follow
412 // if so the next iteration will pick it up
413 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
414 int v1, v2;
415 get_guid(pb, &g);
416 v1 = get_le32(pb);
417 v2 = get_le16(pb);
418 #if 0
419 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
420 int len, v1, n, num;
421 char str[256], *q;
422 char tag[16];
423
424 get_guid(pb, &g);
425 print_guid(&g);
426
427 n = get_le32(pb);
428 for(i=0;i<n;i++) {
429 num = get_le16(pb); /* stream number */
430 get_str16(pb, str, sizeof(str));
431 get_str16(pb, str, sizeof(str));
432 len = get_le16(pb);
433 q = tag;
434 while (len > 0) {
435 v1 = get_byte(pb);
436 if ((q - tag) < sizeof(tag) - 1)
437 *q++ = v1;
438 len--;
439 }
440 *q = '\0';
441 }
442 #endif
443 } else if (url_feof(pb)) {
444 goto fail;
445 } else {
446 url_fseek(pb, gsize - 24, SEEK_CUR);
447 }
448 }
449 get_guid(pb, &g);
450 get_le64(pb);
451 get_byte(pb);
452 get_byte(pb);
453 if (url_feof(pb))
454 goto fail;
455 asf->data_offset = url_ftell(pb);
456 asf->packet_size_left = 0;
457
458 return 0;
459
460 fail:
461 for(i=0;i<s->nb_streams;i++) {
462 AVStream *st = s->streams[i];
463 if (st) {
464 av_free(st->priv_data);
465 av_free(st->codec->extradata);
466 }
467 av_free(st);
468 }
469 return -1;
470 }
471
472 #define DO_2BITS(bits, var, defval) \
473 switch (bits & 3) \
474 { \
475 case 3: var = get_le32(pb); rsize += 4; break; \
476 case 2: var = get_le16(pb); rsize += 2; break; \
477 case 1: var = get_byte(pb); rsize++; break; \
478 default: var = defval; break; \
479 }
480
481 static int asf_get_packet(AVFormatContext *s)
482 {
483 ASFContext *asf = s->priv_data;
484 ByteIOContext *pb = &s->pb;
485 uint32_t packet_length, padsize;
486 int rsize = 9;
487 int c;
488
489 assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
490
491 c = get_byte(pb);
492 if (c != 0x82) {
493 if (!url_feof(pb))
494 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
495 }
496 if ((c & 0x0f) == 2) { // always true for now
497 if (get_le16(pb) != 0) {
498 if (!url_feof(pb))
499 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
500 return AVERROR_IO;
501 }
502 rsize+=2;
503 /* }else{
504 if (!url_feof(pb))
505 printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb));
506 return AVERROR_IO;*/
507 }
508
509 asf->packet_flags = get_byte(pb);
510 asf->packet_property = get_byte(pb);
511
512 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
513 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
514 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
515
516 asf->packet_timestamp = get_le32(pb);
517 get_le16(pb); /* duration */
518 // rsize has at least 11 bytes which have to be present
519
520 if (asf->packet_flags & 0x01) {
521 asf->packet_segsizetype = get_byte(pb); rsize++;
522 asf->packet_segments = asf->packet_segsizetype & 0x3f;
523 } else {
524 asf->packet_segments = 1;
525 asf->packet_segsizetype = 0x80;
526 }
527 asf->packet_size_left = packet_length - padsize - rsize;
528 if (packet_length < asf->hdr.min_pktsize)
529 padsize += asf->hdr.min_pktsize - packet_length;
530 asf->packet_padsize = padsize;
531 #ifdef DEBUG
532 printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
533 #endif
534 return 0;
535 }
536
537 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
538 {
539 ASFContext *asf = s->priv_data;
540 ASFStream *asf_st = 0;
541 ByteIOContext *pb = &s->pb;
542 //static int pc = 0;
543 for (;;) {
544 int rsize = 0;
545 if (asf->packet_size_left < FRAME_HEADER_SIZE
546 || asf->packet_segments < 1) {
547 //asf->packet_size_left <= asf->packet_padsize) {
548 int ret = asf->packet_size_left + asf->packet_padsize;
549 //printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
550 if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
551 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
552 /* fail safe */
553 url_fskip(pb, ret);
554 asf->packet_pos= url_ftell(&s->pb);
555 ret = asf_get_packet(s);
556 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
557 if (ret < 0 || url_feof(pb))
558 return AVERROR_IO;
559 asf->packet_time_start = 0;
560 continue;
561 }
562 if (asf->packet_time_start == 0) {
563 /* read frame header */
564 int num = get_byte(pb);
565 asf->packet_segments--;
566 rsize++;
567 asf->packet_key_frame = (num & 0x80) >> 7;
568 asf->stream_index = asf->asfid2avid[num & 0x7f];
569 // sequence should be ignored!
570 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
571 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
572 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
573 //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);
574 if (asf->packet_replic_size > 1) {
575 assert(asf->packet_replic_size >= 8);
576 // it should be always at least 8 bytes - FIXME validate
577 asf->packet_obj_size = get_le32(pb);
578 asf->packet_frag_timestamp = get_le32(pb); // timestamp
579 if (asf->packet_replic_size > 8)
580 url_fskip(pb, asf->packet_replic_size - 8);
581 rsize += asf->packet_replic_size; // FIXME - check validity
582 } else if (asf->packet_replic_size==1){
583 // multipacket - frag_offset is begining timestamp
584 asf->packet_time_start = asf->packet_frag_offset;
585 asf->packet_frag_offset = 0;
586 asf->packet_frag_timestamp = asf->packet_timestamp;
587
588 asf->packet_time_delta = get_byte(pb);
589 rsize++;
590 }else{
591 assert(asf->packet_replic_size==0);
592 }
593 if (asf->packet_flags & 0x01) {
594 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
595 #undef DO_2BITS
596 //printf("Fragsize %d\n", asf->packet_frag_size);
597 } else {
598 asf->packet_frag_size = asf->packet_size_left - rsize;
599 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
600 }
601 if (asf->packet_replic_size == 1) {
602 asf->packet_multi_size = asf->packet_frag_size;
603 if (asf->packet_multi_size > asf->packet_size_left) {
604 asf->packet_segments = 0;
605 continue;
606 }
607 }
608 asf->packet_size_left -= rsize;
609 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
610
611 if (asf->stream_index < 0
612 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
613 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
614 ) {
615 asf->packet_time_start = 0;
616 /* unhandled packet (should not happen) */
617 url_fskip(pb, asf->packet_frag_size);
618 asf->packet_size_left -= asf->packet_frag_size;
619 if(asf->stream_index < 0)
620 av_log(s, AV_LOG_ERROR, "ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f);
621 continue;
622 }
623 asf->asf_st = s->streams[asf->stream_index]->priv_data;
624 }
625 asf_st = asf->asf_st;
626
627 if ((asf->packet_frag_offset != asf_st->frag_offset
628 || (asf->packet_frag_offset
629 && asf->packet_seq != asf_st->seq)) // seq should be ignored
630 ) {
631 /* cannot continue current packet: free it */
632 // FIXME better check if packet was already allocated
633 av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d o:%d - %d %d %d fl:%d\n",
634 asf_st->pkt.size,
635 asf->packet_obj_size,
636 asf->packet_frag_offset, asf_st->frag_offset,
637 asf->packet_seq, asf_st->seq, asf->packet_frag_size);
638 if (asf_st->pkt.size)
639 av_free_packet(&asf_st->pkt);
640 asf_st->frag_offset = 0;
641 if (asf->packet_frag_offset != 0) {
642 url_fskip(pb, asf->packet_frag_size);
643 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
644 asf->packet_size_left -= asf->packet_frag_size;
645 continue;
646 }
647 }
648 if (asf->packet_replic_size == 1) {
649 // frag_offset is here used as the begining timestamp
650 asf->packet_frag_timestamp = asf->packet_time_start;
651 asf->packet_time_start += asf->packet_time_delta;
652 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
653 asf->packet_size_left--;
654 asf->packet_multi_size--;
655 if (asf->packet_multi_size < asf->packet_obj_size)
656 {
657 asf->packet_time_start = 0;
658 url_fskip(pb, asf->packet_multi_size);
659 asf->packet_size_left -= asf->packet_multi_size;
660 continue;
661 }
662 asf->packet_multi_size -= asf->packet_obj_size;
663 //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);
664 }
665 if (asf_st->frag_offset == 0) {
666 /* new packet */
667 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
668 asf_st->seq = asf->packet_seq;
669 asf_st->pkt.pts = asf->packet_frag_timestamp;
670 asf_st->pkt.stream_index = asf->stream_index;
671 asf_st->pkt.pos =
672 asf_st->packet_pos= asf->packet_pos;
673 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
674 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
675 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
676 if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
677 asf->packet_key_frame = 1;
678 if (asf->packet_key_frame)
679 asf_st->pkt.flags |= PKT_FLAG_KEY;
680 }
681
682 /* read data */
683 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
684 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
685 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
686 asf->packet_size_left -= asf->packet_frag_size;
687 if (asf->packet_size_left < 0)
688 continue;
689 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
690 asf->packet_frag_size);
691 asf_st->frag_offset += asf->packet_frag_size;
692 /* test if whole packet is read */
693 if (asf_st->frag_offset == asf_st->pkt.size) {
694 /* return packet */
695 if (asf_st->ds_span > 1) {
696 /* packet descrambling */
697 char* newdata = av_malloc(asf_st->pkt.size);
698 if (newdata) {
699 int offset = 0;
700 while (offset < asf_st->pkt.size) {
701 int off = offset / asf_st->ds_chunk_size;
702 int row = off / asf_st->ds_span;
703 int col = off % asf_st->ds_span;
704 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
705 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
706 memcpy(newdata + offset,
707 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
708 asf_st->ds_chunk_size);
709 offset += asf_st->ds_chunk_size;
710 }
711 av_free(asf_st->pkt.data);
712 asf_st->pkt.data = newdata;
713 }
714 }
715 asf_st->frag_offset = 0;
716 memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
717 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
718 asf_st->pkt.size = 0;
719 asf_st->pkt.data = 0;
720 break; // packet completed
721 }
722 }
723 return 0;
724 }
725
726 static int asf_read_close(AVFormatContext *s)
727 {
728 int i;
729
730 for(i=0;i<s->nb_streams;i++) {
731 AVStream *st = s->streams[i];
732 av_free(st->priv_data);
733 av_free(st->codec->extradata);
734 av_free(st->codec->palctrl);
735 }
736 return 0;
737 }
738
739 // Added to support seeking after packets have been read
740 // If information is not reset, read_packet fails due to
741 // leftover information from previous reads
742 static void asf_reset_header(AVFormatContext *s)
743 {
744 ASFContext *asf = s->priv_data;
745 ASFStream *asf_st;
746 int i;
747
748 asf->packet_nb_frames = 0;
749 asf->packet_timestamp_start = -1;
750 asf->packet_timestamp_end = -1;
751 asf->packet_size_left = 0;
752 asf->packet_segments = 0;
753 asf->packet_flags = 0;
754 asf->packet_property = 0;
755 asf->packet_timestamp = 0;
756 asf->packet_segsizetype = 0;
757 asf->packet_segments = 0;
758 asf->packet_seq = 0;
759 asf->packet_replic_size = 0;
760 asf->packet_key_frame = 0;
761 asf->packet_padsize = 0;
762 asf->packet_frag_offset = 0;
763 asf->packet_frag_size = 0;
764 asf->packet_frag_timestamp = 0;
765 asf->packet_multi_size = 0;
766 asf->packet_obj_size = 0;
767 asf->packet_time_delta = 0;
768 asf->packet_time_start = 0;
769
770 for(i=0; i<s->nb_streams; i++){
771 asf_st= s->streams[i]->priv_data;
772 av_free_packet(&asf_st->pkt);
773 asf_st->frag_offset=0;
774 asf_st->seq=0;
775 }
776 asf->asf_st= NULL;
777 }
778
779 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
780 {
781 ASFContext *asf = s->priv_data;
782 AVPacket pkt1, *pkt = &pkt1;
783 ASFStream *asf_st;
784 int64_t pts;
785 int64_t pos= *ppos;
786 int i;
787 int64_t start_pos[s->nb_streams];
788
789 for(i=0; i<s->nb_streams; i++){
790 start_pos[i]= pos;
791 }
792
793 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
794 *ppos= pos;
795 url_fseek(&s->pb, pos, SEEK_SET);
796
797 //printf("asf_read_pts\n");
798 asf_reset_header(s);
799 for(;;){
800 if (av_read_frame(s, pkt) < 0){
801 av_log(s, AV_LOG_INFO, "seek failed\n");
802 return AV_NOPTS_VALUE;
803 }
804
805 pts= pkt->pts;
806
807 av_free_packet(pkt);
808 if(pkt->flags&PKT_FLAG_KEY){
809 i= pkt->stream_index;
810
811 asf_st= s->streams[i]->priv_data;
812
813 assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
814 pos= asf_st->packet_pos;
815
816 av_add_index_entry(s->streams[i], pos, pkt->size, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
817 start_pos[i]= asf_st->packet_pos + 1;
818
819 if(pkt->stream_index == stream_index)
820 break;
821 }
822 }
823
824 *ppos= pos;
825 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
826
827 return pts;
828 }
829
830 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
831 {
832 ASFContext *asf = s->priv_data;
833
834 if (asf->packet_size <= 0)
835 return -1;
836
837 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
838 return -1;
839
840 asf_reset_header(s);
841 return 0;
842 }
843
844 static AVInputFormat asf_iformat = {
845 "asf",
846 "asf format",
847 sizeof(ASFContext),
848 asf_probe,
849 asf_read_header,
850 asf_read_packet,
851 asf_read_close,
852 asf_read_seek,
853 asf_read_pts,
854 };
855
856 #ifdef CONFIG_MUXERS
857 extern AVOutputFormat asf_oformat;
858 extern AVOutputFormat asf_stream_oformat;
859 #endif //CONFIG_MUXERS
860
861 int asf_init(void)
862 {
863 av_register_input_format(&asf_iformat);
864 #ifdef CONFIG_MUXERS
865 av_register_output_format(&asf_oformat);
866 av_register_output_format(&asf_stream_oformat);
867 #endif //CONFIG_MUXERS
868 return 0;
869 }