read and use index (based on a patch by John Donaghy on the 23-03-2006 '[Ffmpeg-devel...
[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 "riff.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, type_specific_size, sizeX;
191 uint64_t total_size;
192 unsigned int tag1;
193 int64_t pos1, pos2;
194 int test_for_ext_stream_audio;
195
196 pos1 = url_ftell(pb);
197
198 st = av_new_stream(s, 0);
199 if (!st)
200 goto fail;
201 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
202 asf_st = av_mallocz(sizeof(ASFStream));
203 if (!asf_st)
204 goto fail;
205 st->priv_data = asf_st;
206 st->start_time = asf->hdr.preroll;
207 st->duration = asf->hdr.send_time /
208 (10000000 / 1000) - st->start_time;
209 get_guid(pb, &g);
210
211 test_for_ext_stream_audio = 0;
212 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
213 type = CODEC_TYPE_AUDIO;
214 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
215 type = CODEC_TYPE_VIDEO;
216 } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
217 type = CODEC_TYPE_UNKNOWN;
218 } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
219 test_for_ext_stream_audio = 1;
220 type = CODEC_TYPE_UNKNOWN;
221 } else {
222 goto fail;
223 }
224 get_guid(pb, &g);
225 total_size = get_le64(pb);
226 type_specific_size = get_le32(pb);
227 get_le32(pb);
228 st->id = get_le16(pb) & 0x7f; /* stream id */
229 // mapping of asf ID to AV stream ID;
230 asf->asfid2avid[st->id] = s->nb_streams - 1;
231
232 get_le32(pb);
233
234 if (test_for_ext_stream_audio) {
235 get_guid(pb, &g);
236 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
237 type = CODEC_TYPE_AUDIO;
238 get_guid(pb, &g);
239 get_le32(pb);
240 get_le32(pb);
241 get_le32(pb);
242 get_guid(pb, &g);
243 get_le32(pb);
244 }
245 }
246
247 st->codec->codec_type = type;
248 if (type == CODEC_TYPE_AUDIO) {
249 get_wav_header(pb, st->codec, type_specific_size);
250 st->need_parsing = 1;
251 /* We have to init the frame size at some point .... */
252 pos2 = url_ftell(pb);
253 if (gsize > (pos2 + 8 - pos1 + 24)) {
254 asf_st->ds_span = get_byte(pb);
255 asf_st->ds_packet_size = get_le16(pb);
256 asf_st->ds_chunk_size = get_le16(pb);
257 asf_st->ds_data_size = get_le16(pb);
258 asf_st->ds_silence_data = get_byte(pb);
259 }
260 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
261 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
262 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
263 if (asf_st->ds_span > 1) {
264 if (!asf_st->ds_chunk_size
265 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
266 asf_st->ds_span = 0; // disable descrambling
267 }
268 switch (st->codec->codec_id) {
269 case CODEC_ID_MP3:
270 st->codec->frame_size = MPA_FRAME_SIZE;
271 break;
272 case CODEC_ID_PCM_S16LE:
273 case CODEC_ID_PCM_S16BE:
274 case CODEC_ID_PCM_U16LE:
275 case CODEC_ID_PCM_U16BE:
276 case CODEC_ID_PCM_S8:
277 case CODEC_ID_PCM_U8:
278 case CODEC_ID_PCM_ALAW:
279 case CODEC_ID_PCM_MULAW:
280 st->codec->frame_size = 1;
281 break;
282 default:
283 /* This is probably wrong, but it prevents a crash later */
284 st->codec->frame_size = 1;
285 break;
286 }
287 } else if (type == CODEC_TYPE_VIDEO) {
288 get_le32(pb);
289 get_le32(pb);
290 get_byte(pb);
291 size = get_le16(pb); /* size */
292 sizeX= get_le32(pb); /* size */
293 st->codec->width = get_le32(pb);
294 st->codec->height = get_le32(pb);
295 /* not available for asf */
296 get_le16(pb); /* panes */
297 st->codec->bits_per_sample = get_le16(pb); /* depth */
298 tag1 = get_le32(pb);
299 url_fskip(pb, 20);
300 // av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
301 size= sizeX;
302 if (size > 40) {
303 st->codec->extradata_size = size - 40;
304 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
305 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
306 }
307
308 /* Extract palette from extradata if bpp <= 8 */
309 /* This code assumes that extradata contains only palette */
310 /* This is true for all paletted codecs implemented in ffmpeg */
311 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
312 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
313 #ifdef WORDS_BIGENDIAN
314 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
315 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
316 #else
317 memcpy(st->codec->palctrl->palette, st->codec->extradata,
318 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
319 #endif
320 st->codec->palctrl->palette_changed = 1;
321 }
322
323 st->codec->codec_tag = tag1;
324 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
325 if(tag1 == MKTAG('D', 'V', 'R', ' '))
326 st->need_parsing = 1;
327 }
328 pos2 = url_ftell(pb);
329 url_fskip(pb, gsize - (pos2 - pos1 + 24));
330 } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
331 asf->data_object_offset = url_ftell(pb);
332 if (gsize != (uint64_t)-1 && gsize >= 24) {
333 asf->data_object_size = gsize - 24;
334 } else {
335 asf->data_object_size = (uint64_t)-1;
336 }
337 break;
338 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
339 int len1, len2, len3, len4, len5;
340
341 len1 = get_le16(pb);
342 len2 = get_le16(pb);
343 len3 = get_le16(pb);
344 len4 = get_le16(pb);
345 len5 = get_le16(pb);
346 get_str16_nolen(pb, len1, s->title, sizeof(s->title));
347 get_str16_nolen(pb, len2, s->author, sizeof(s->author));
348 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
349 get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
350 url_fskip(pb, len5);
351 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
352 int desc_count, i;
353
354 desc_count = get_le16(pb);
355 for(i=0;i<desc_count;i++)
356 {
357 int name_len,value_type,value_len;
358 uint64_t value_num = 0;
359 char *name, *value;
360
361 name_len = get_le16(pb);
362 name = (char *)av_mallocz(name_len);
363 get_str16_nolen(pb, name_len, name, name_len);
364 value_type = get_le16(pb);
365 value_len = get_le16(pb);
366 if ((value_type == 0) || (value_type == 1)) // unicode or byte
367 {
368 value = (char *)av_mallocz(value_len);
369 get_str16_nolen(pb, value_len, value, value_len);
370 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
371 av_free(value);
372 }
373 if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
374 {
375 if (value_type==2) value_num = get_le32(pb);
376 if (value_type==3) value_num = get_le32(pb);
377 if (value_type==4) value_num = get_le64(pb);
378 if (value_type==5) value_num = get_le16(pb);
379 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
380 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
381 }
382 av_free(name);
383 }
384 } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
385 int ext_len, payload_ext_ct, stream_ct;
386 uint32_t ext_d;
387 int64_t pos_ex_st;
388 pos_ex_st = url_ftell(pb);
389
390 get_le64(pb);
391 get_le64(pb);
392 get_le32(pb);
393 get_le32(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_le16(pb);
401 get_le16(pb);
402 get_le64(pb);
403 stream_ct = get_le16(pb);
404 payload_ext_ct = get_le16(pb);
405
406 for (i=0; i<stream_ct; i++){
407 get_le16(pb);
408 ext_len = get_le16(pb);
409 url_fseek(pb, ext_len, SEEK_CUR);
410 }
411
412 for (i=0; i<payload_ext_ct; i++){
413 get_guid(pb, &g);
414 ext_d=get_le16(pb);
415 ext_len=get_le32(pb);
416 url_fseek(pb, ext_len, SEEK_CUR);
417 }
418
419 // there could be a optional stream properties object to follow
420 // if so the next iteration will pick it up
421 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
422 int v1, v2;
423 get_guid(pb, &g);
424 v1 = get_le32(pb);
425 v2 = get_le16(pb);
426 #if 0
427 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
428 int len, v1, n, num;
429 char str[256], *q;
430 char tag[16];
431
432 get_guid(pb, &g);
433 print_guid(&g);
434
435 n = get_le32(pb);
436 for(i=0;i<n;i++) {
437 num = get_le16(pb); /* stream number */
438 get_str16(pb, str, sizeof(str));
439 get_str16(pb, str, sizeof(str));
440 len = get_le16(pb);
441 q = tag;
442 while (len > 0) {
443 v1 = get_byte(pb);
444 if ((q - tag) < sizeof(tag) - 1)
445 *q++ = v1;
446 len--;
447 }
448 *q = '\0';
449 }
450 #endif
451 } else if (url_feof(pb)) {
452 goto fail;
453 } else {
454 url_fseek(pb, gsize - 24, SEEK_CUR);
455 }
456 }
457 get_guid(pb, &g);
458 get_le64(pb);
459 get_byte(pb);
460 get_byte(pb);
461 if (url_feof(pb))
462 goto fail;
463 asf->data_offset = url_ftell(pb);
464 asf->packet_size_left = 0;
465
466 return 0;
467
468 fail:
469 for(i=0;i<s->nb_streams;i++) {
470 AVStream *st = s->streams[i];
471 if (st) {
472 av_free(st->priv_data);
473 av_free(st->codec->extradata);
474 }
475 av_free(st);
476 }
477 return -1;
478 }
479
480 #define DO_2BITS(bits, var, defval) \
481 switch (bits & 3) \
482 { \
483 case 3: var = get_le32(pb); rsize += 4; break; \
484 case 2: var = get_le16(pb); rsize += 2; break; \
485 case 1: var = get_byte(pb); rsize++; break; \
486 default: var = defval; break; \
487 }
488
489 static int asf_get_packet(AVFormatContext *s)
490 {
491 ASFContext *asf = s->priv_data;
492 ByteIOContext *pb = &s->pb;
493 uint32_t packet_length, padsize;
494 int rsize = 9;
495 int c;
496
497 assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
498
499 c = get_byte(pb);
500 if (c != 0x82) {
501 if (!url_feof(pb))
502 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
503 }
504 if ((c & 0x0f) == 2) { // always true for now
505 if (get_le16(pb) != 0) {
506 if (!url_feof(pb))
507 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
508 return AVERROR_IO;
509 }
510 rsize+=2;
511 /* }else{
512 if (!url_feof(pb))
513 printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb));
514 return AVERROR_IO;*/
515 }
516
517 asf->packet_flags = get_byte(pb);
518 asf->packet_property = get_byte(pb);
519
520 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
521 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
522 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
523
524 asf->packet_timestamp = get_le32(pb);
525 get_le16(pb); /* duration */
526 // rsize has at least 11 bytes which have to be present
527
528 if (asf->packet_flags & 0x01) {
529 asf->packet_segsizetype = get_byte(pb); rsize++;
530 asf->packet_segments = asf->packet_segsizetype & 0x3f;
531 } else {
532 asf->packet_segments = 1;
533 asf->packet_segsizetype = 0x80;
534 }
535 asf->packet_size_left = packet_length - padsize - rsize;
536 if (packet_length < asf->hdr.min_pktsize)
537 padsize += asf->hdr.min_pktsize - packet_length;
538 asf->packet_padsize = padsize;
539 #ifdef DEBUG
540 printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
541 #endif
542 return 0;
543 }
544
545 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
546 {
547 ASFContext *asf = s->priv_data;
548 ASFStream *asf_st = 0;
549 ByteIOContext *pb = &s->pb;
550 //static int pc = 0;
551 for (;;) {
552 int rsize = 0;
553 if (asf->packet_size_left < FRAME_HEADER_SIZE
554 || asf->packet_segments < 1) {
555 //asf->packet_size_left <= asf->packet_padsize) {
556 int ret = asf->packet_size_left + asf->packet_padsize;
557 //printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
558 if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
559 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
560 /* fail safe */
561 url_fskip(pb, ret);
562 asf->packet_pos= url_ftell(&s->pb);
563 if (asf->data_object_size != (uint64_t)-1 &&
564 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
565 return AVERROR_IO; /* Do not exceed the size of the data object */
566 ret = asf_get_packet(s);
567 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
568 if (ret < 0 || url_feof(pb))
569 return AVERROR_IO;
570 asf->packet_time_start = 0;
571 continue;
572 }
573 if (asf->packet_time_start == 0) {
574 /* read frame header */
575 int num = get_byte(pb);
576 asf->packet_segments--;
577 rsize++;
578 asf->packet_key_frame = (num & 0x80) >> 7;
579 asf->stream_index = asf->asfid2avid[num & 0x7f];
580 // sequence should be ignored!
581 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
582 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
583 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
584 //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);
585 if (asf->packet_replic_size > 1) {
586 assert(asf->packet_replic_size >= 8);
587 // it should be always at least 8 bytes - FIXME validate
588 asf->packet_obj_size = get_le32(pb);
589 asf->packet_frag_timestamp = get_le32(pb); // timestamp
590 if (asf->packet_replic_size > 8)
591 url_fskip(pb, asf->packet_replic_size - 8);
592 rsize += asf->packet_replic_size; // FIXME - check validity
593 } else if (asf->packet_replic_size==1){
594 // multipacket - frag_offset is begining timestamp
595 asf->packet_time_start = asf->packet_frag_offset;
596 asf->packet_frag_offset = 0;
597 asf->packet_frag_timestamp = asf->packet_timestamp;
598
599 asf->packet_time_delta = get_byte(pb);
600 rsize++;
601 }else{
602 assert(asf->packet_replic_size==0);
603 }
604 if (asf->packet_flags & 0x01) {
605 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
606 #undef DO_2BITS
607 //printf("Fragsize %d\n", asf->packet_frag_size);
608 } else {
609 asf->packet_frag_size = asf->packet_size_left - rsize;
610 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
611 }
612 if (asf->packet_replic_size == 1) {
613 asf->packet_multi_size = asf->packet_frag_size;
614 if (asf->packet_multi_size > asf->packet_size_left) {
615 asf->packet_segments = 0;
616 continue;
617 }
618 }
619 asf->packet_size_left -= rsize;
620 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
621
622 if (asf->stream_index < 0
623 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
624 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
625 ) {
626 asf->packet_time_start = 0;
627 /* unhandled packet (should not happen) */
628 url_fskip(pb, asf->packet_frag_size);
629 asf->packet_size_left -= asf->packet_frag_size;
630 if(asf->stream_index < 0)
631 av_log(s, AV_LOG_ERROR, "ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f);
632 continue;
633 }
634 asf->asf_st = s->streams[asf->stream_index]->priv_data;
635 }
636 asf_st = asf->asf_st;
637
638 if ((asf->packet_frag_offset != asf_st->frag_offset
639 || (asf->packet_frag_offset
640 && asf->packet_seq != asf_st->seq)) // seq should be ignored
641 ) {
642 /* cannot continue current packet: free it */
643 // FIXME better check if packet was already allocated
644 av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d o:%d - %d %d %d fl:%d\n",
645 asf_st->pkt.size,
646 asf->packet_obj_size,
647 asf->packet_frag_offset, asf_st->frag_offset,
648 asf->packet_seq, asf_st->seq, asf->packet_frag_size);
649 if (asf_st->pkt.size)
650 av_free_packet(&asf_st->pkt);
651 asf_st->frag_offset = 0;
652 if (asf->packet_frag_offset != 0) {
653 url_fskip(pb, asf->packet_frag_size);
654 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
655 asf->packet_size_left -= asf->packet_frag_size;
656 continue;
657 }
658 }
659 if (asf->packet_replic_size == 1) {
660 // frag_offset is here used as the begining timestamp
661 asf->packet_frag_timestamp = asf->packet_time_start;
662 asf->packet_time_start += asf->packet_time_delta;
663 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
664 asf->packet_size_left--;
665 asf->packet_multi_size--;
666 if (asf->packet_multi_size < asf->packet_obj_size)
667 {
668 asf->packet_time_start = 0;
669 url_fskip(pb, asf->packet_multi_size);
670 asf->packet_size_left -= asf->packet_multi_size;
671 continue;
672 }
673 asf->packet_multi_size -= asf->packet_obj_size;
674 //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);
675 }
676 if (asf_st->frag_offset == 0) {
677 /* new packet */
678 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
679 asf_st->seq = asf->packet_seq;
680 asf_st->pkt.pts = asf->packet_frag_timestamp;
681 asf_st->pkt.stream_index = asf->stream_index;
682 asf_st->pkt.pos =
683 asf_st->packet_pos= asf->packet_pos;
684 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
685 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
686 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
687 if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
688 asf->packet_key_frame = 1;
689 if (asf->packet_key_frame)
690 asf_st->pkt.flags |= PKT_FLAG_KEY;
691 }
692
693 /* read data */
694 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
695 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
696 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
697 asf->packet_size_left -= asf->packet_frag_size;
698 if (asf->packet_size_left < 0)
699 continue;
700 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
701 asf->packet_frag_size);
702 asf_st->frag_offset += asf->packet_frag_size;
703 /* test if whole packet is read */
704 if (asf_st->frag_offset == asf_st->pkt.size) {
705 /* return packet */
706 if (asf_st->ds_span > 1) {
707 /* packet descrambling */
708 char* newdata = av_malloc(asf_st->pkt.size);
709 if (newdata) {
710 int offset = 0;
711 while (offset < asf_st->pkt.size) {
712 int off = offset / asf_st->ds_chunk_size;
713 int row = off / asf_st->ds_span;
714 int col = off % asf_st->ds_span;
715 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
716 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
717 memcpy(newdata + offset,
718 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
719 asf_st->ds_chunk_size);
720 offset += asf_st->ds_chunk_size;
721 }
722 av_free(asf_st->pkt.data);
723 asf_st->pkt.data = newdata;
724 }
725 }
726 asf_st->frag_offset = 0;
727 memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
728 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
729 asf_st->pkt.size = 0;
730 asf_st->pkt.data = 0;
731 break; // packet completed
732 }
733 }
734 return 0;
735 }
736
737 static int asf_read_close(AVFormatContext *s)
738 {
739 int i;
740
741 for(i=0;i<s->nb_streams;i++) {
742 AVStream *st = s->streams[i];
743 av_free(st->priv_data);
744 av_free(st->codec->palctrl);
745 }
746 return 0;
747 }
748
749 // Added to support seeking after packets have been read
750 // If information is not reset, read_packet fails due to
751 // leftover information from previous reads
752 static void asf_reset_header(AVFormatContext *s)
753 {
754 ASFContext *asf = s->priv_data;
755 ASFStream *asf_st;
756 int i;
757
758 asf->packet_nb_frames = 0;
759 asf->packet_timestamp_start = -1;
760 asf->packet_timestamp_end = -1;
761 asf->packet_size_left = 0;
762 asf->packet_segments = 0;
763 asf->packet_flags = 0;
764 asf->packet_property = 0;
765 asf->packet_timestamp = 0;
766 asf->packet_segsizetype = 0;
767 asf->packet_segments = 0;
768 asf->packet_seq = 0;
769 asf->packet_replic_size = 0;
770 asf->packet_key_frame = 0;
771 asf->packet_padsize = 0;
772 asf->packet_frag_offset = 0;
773 asf->packet_frag_size = 0;
774 asf->packet_frag_timestamp = 0;
775 asf->packet_multi_size = 0;
776 asf->packet_obj_size = 0;
777 asf->packet_time_delta = 0;
778 asf->packet_time_start = 0;
779
780 for(i=0; i<s->nb_streams; i++){
781 asf_st= s->streams[i]->priv_data;
782 av_free_packet(&asf_st->pkt);
783 asf_st->frag_offset=0;
784 asf_st->seq=0;
785 }
786 asf->asf_st= NULL;
787 }
788
789 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
790 {
791 ASFContext *asf = s->priv_data;
792 AVPacket pkt1, *pkt = &pkt1;
793 ASFStream *asf_st;
794 int64_t pts;
795 int64_t pos= *ppos;
796 int i;
797 int64_t start_pos[s->nb_streams];
798
799 for(i=0; i<s->nb_streams; i++){
800 start_pos[i]= pos;
801 }
802
803 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
804 *ppos= pos;
805 url_fseek(&s->pb, pos, SEEK_SET);
806
807 //printf("asf_read_pts\n");
808 asf_reset_header(s);
809 for(;;){
810 if (av_read_frame(s, pkt) < 0){
811 av_log(s, AV_LOG_INFO, "seek failed\n");
812 return AV_NOPTS_VALUE;
813 }
814
815 pts= pkt->pts;
816
817 av_free_packet(pkt);
818 if(pkt->flags&PKT_FLAG_KEY){
819 i= pkt->stream_index;
820
821 asf_st= s->streams[i]->priv_data;
822
823 assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
824 pos= asf_st->packet_pos;
825
826 av_add_index_entry(s->streams[i], pos, pkt->size, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
827 start_pos[i]= asf_st->packet_pos + 1;
828
829 if(pkt->stream_index == stream_index)
830 break;
831 }
832 }
833
834 *ppos= pos;
835 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
836
837 return pts;
838 }
839
840 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
841 {
842 GUID g;
843 ASFContext *asf = s->priv_data;
844 int64_t gsize, itime;
845 int64_t pos, current_pos, index_pts;
846 int i;
847 int pct,ict;
848
849 current_pos = url_ftell(&s->pb);
850
851 url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
852 get_guid(&s->pb, &g);
853 if (!memcmp(&g, &index_guid, sizeof(GUID))) {
854 gsize = get_le64(&s->pb);
855 get_guid(&s->pb, &g);
856 itime=get_le64(&s->pb);
857 pct=get_le32(&s->pb);
858 ict=get_le32(&s->pb);
859 av_log(NULL, AV_LOG_DEBUG, "itime:0x%Lx, pct:%d, ict:%d\n",itime,pct,ict);
860
861 for (i=0;i<ict;i++){
862 int pktnum=get_le32(&s->pb);
863 int pktct =get_le16(&s->pb);
864 av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
865
866 pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
867 index_pts=av_rescale(itime, i, 10000);
868
869 av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
870 }
871 }
872 url_fseek(&s->pb, current_pos, SEEK_SET);
873 }
874
875 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
876 {
877 ASFContext *asf = s->priv_data;
878 AVStream *st = s->streams[stream_index];
879 int64_t pos;
880 int index;
881
882 if (asf->packet_size <= 0)
883 return -1;
884
885 if (!st->index_entries)
886 asf_build_simple_index(s, stream_index);
887
888 if(!st->index_entries){
889 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
890 return -1;
891 }else{
892 index= av_index_search_timestamp(st, pts, flags);
893 if(index<0)
894 return -1;
895
896 /* find the position */
897 pos = st->index_entries[index].pos;
898 pts = st->index_entries[index].timestamp;
899
900 // various attempts to find key frame have failed so far
901 // asf_reset_header(s);
902 // url_fseek(&s->pb, pos, SEEK_SET);
903 // key_pos = pos;
904 // for(i=0;i<16;i++){
905 // pos = url_ftell(&s->pb);
906 // if (av_read_frame(s, &pkt) < 0){
907 // av_log(s, AV_LOG_INFO, "seek failed\n");
908 // return -1;
909 // }
910 // asf_st = s->streams[stream_index]->priv_data;
911 // pos += st->parser->frame_offset;
912 //
913 // if (pkt.size > b) {
914 // b = pkt.size;
915 // key_pos = pos;
916 // }
917 //
918 // av_free_packet(&pkt);
919 // }
920
921 /* do the seek */
922 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %Ld\n", pos);
923 url_fseek(&s->pb, pos, SEEK_SET);
924 }
925 asf_reset_header(s);
926 return 0;
927 }
928
929 AVInputFormat asf_demuxer = {
930 "asf",
931 "asf format",
932 sizeof(ASFContext),
933 asf_probe,
934 asf_read_header,
935 asf_read_packet,
936 asf_read_close,
937 asf_read_seek,
938 asf_read_pts,
939 };