store index for seeking in the native timebase of each stream
[ffmpeg.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 / (10000000 / AV_TIME_BASE);
200             st->duration = (asf->hdr.send_time - asf->hdr.preroll) / 
201                 (10000000 / AV_TIME_BASE);
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 = 1; 
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);
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             }
299             pos2 = url_ftell(pb);
300             url_fskip(pb, gsize - (pos2 - pos1 + 24));
301         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
302             break;
303         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
304             int len1, len2, len3, len4, len5;
305
306             len1 = get_le16(pb);
307             len2 = get_le16(pb);
308             len3 = get_le16(pb);
309             len4 = get_le16(pb);
310             len5 = get_le16(pb);
311             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
312             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
313             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
314             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
315             url_fskip(pb, len5);
316        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
317                 int desc_count, i;
318
319                 desc_count = get_le16(pb);
320                 for(i=0;i<desc_count;i++)
321                 {
322                         int name_len,value_type,value_len,value_num = 0;
323                         char *name, *value;
324
325                         name_len = get_le16(pb);
326                         name = (char *)av_mallocz(name_len);
327                         get_str16_nolen(pb, name_len, name, name_len);
328                         value_type = get_le16(pb);
329                         value_len = get_le16(pb);
330                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
331                         {
332                                 value = (char *)av_mallocz(value_len);
333                                 get_str16_nolen(pb, value_len, value, value_len);
334                                 if (strcmp(name,"WM/AlbumTitle")==0) { strcpy(s->album, value); }
335                                 av_free(value);
336                         }
337                         if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD
338                         {
339                                 if (value_type==2) value_num = get_le32(pb);
340                                 if (value_type==3) value_num = get_le32(pb);
341                                 if (value_type==4) value_num = get_le64(pb);
342                                 if (value_type==5) value_num = get_le16(pb);
343                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
344                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
345                         }
346                         av_free(name);
347                 }
348 #if 0
349         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
350             int v1, v2;
351             get_guid(pb, &g);
352             v1 = get_le32(pb);
353             v2 = get_le16(pb);
354         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
355             int len, v1, n, num;
356             char str[256], *q;
357             char tag[16];
358
359             get_guid(pb, &g);
360             print_guid(&g);
361
362             n = get_le32(pb);
363             for(i=0;i<n;i++) {
364                 num = get_le16(pb); /* stream number */
365                 get_str16(pb, str, sizeof(str));
366                 get_str16(pb, str, sizeof(str));
367                 len = get_le16(pb);
368                 q = tag;
369                 while (len > 0) {
370                     v1 = get_byte(pb);
371                     if ((q - tag) < sizeof(tag) - 1)
372                         *q++ = v1;
373                     len--;
374                 }
375                 *q = '\0';
376             }
377 #endif
378         } else if (url_feof(pb)) {
379             goto fail;
380         } else {
381             url_fseek(pb, gsize - 24, SEEK_CUR);
382         }
383     }
384     get_guid(pb, &g);
385     get_le64(pb);
386     get_byte(pb);
387     get_byte(pb);
388     if (url_feof(pb))
389         goto fail;
390     asf->data_offset = url_ftell(pb);
391     asf->packet_size_left = 0;
392
393     return 0;
394
395  fail:
396      for(i=0;i<s->nb_streams;i++) {
397         AVStream *st = s->streams[i];
398         if (st) {
399             av_free(st->priv_data);
400             av_free(st->codec.extradata);
401         }
402         av_free(st);
403     }
404     return -1;
405 }
406
407 #define DO_2BITS(bits, var, defval) \
408     switch (bits & 3) \
409     { \
410     case 3: var = get_le32(pb); rsize += 4; break; \
411     case 2: var = get_le16(pb); rsize += 2; break; \
412     case 1: var = get_byte(pb); rsize++; break; \
413     default: var = defval; break; \
414     }
415
416 static int asf_get_packet(AVFormatContext *s)
417 {
418     ASFContext *asf = s->priv_data;
419     ByteIOContext *pb = &s->pb;
420     uint32_t packet_length, padsize;
421     int rsize = 9;
422     int c;
423     
424     if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size)
425         return -1;
426     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
427     
428     c = get_byte(pb);
429     if (c != 0x82) {
430         if (!url_feof(pb))
431             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
432     }
433     if ((c & 0x0f) == 2) { // always true for now
434         if (get_le16(pb) != 0) {
435             if (!url_feof(pb))
436                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
437             return -EIO;
438         }
439         rsize+=2;
440 /*    }else{
441         if (!url_feof(pb))
442             printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
443         return -EIO;*/
444     }
445
446     asf->packet_flags = get_byte(pb);
447     asf->packet_property = get_byte(pb);
448
449     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
450     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
451     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
452
453     asf->packet_timestamp = get_le32(pb);
454     get_le16(pb); /* duration */
455     // rsize has at least 11 bytes which have to be present
456
457     if (asf->packet_flags & 0x01) {
458         asf->packet_segsizetype = get_byte(pb); rsize++;
459         asf->packet_segments = asf->packet_segsizetype & 0x3f;
460     } else {
461         asf->packet_segments = 1;
462         asf->packet_segsizetype = 0x80;
463     }
464     asf->packet_size_left = packet_length - padsize - rsize;
465     if (packet_length < asf->hdr.min_pktsize)
466         padsize += asf->hdr.min_pktsize - packet_length;
467     asf->packet_padsize = padsize;
468 #ifdef DEBUG
469     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
470 #endif
471     return 0;
472 }
473
474 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
475 {
476     ASFContext *asf = s->priv_data;
477     ASFStream *asf_st = 0;
478     ByteIOContext *pb = &s->pb;
479     //static int pc = 0;
480     for (;;) {
481         int rsize = 0;
482         if (asf->packet_size_left < FRAME_HEADER_SIZE
483             || asf->packet_segments < 1) {
484             //asf->packet_size_left <= asf->packet_padsize) {
485             int ret = asf->packet_size_left + asf->packet_padsize;
486             //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
487             /* fail safe */
488             url_fskip(pb, ret);
489             asf->packet_pos= url_ftell(&s->pb);
490             ret = asf_get_packet(s);
491             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
492             if (ret < 0 || url_feof(pb))
493                 return -EIO;
494             asf->packet_time_start = 0;
495             continue;
496         }
497         if (asf->packet_time_start == 0) {
498             /* read frame header */
499             int num = get_byte(pb);
500             asf->packet_segments--;
501             rsize++;
502             asf->packet_key_frame = (num & 0x80) >> 7;
503             asf->stream_index = asf->asfid2avid[num & 0x7f];
504             // sequence should be ignored!
505             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
506             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
507             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
508 //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);
509             if (asf->packet_replic_size > 1) {
510                 assert(asf->packet_replic_size >= 8);
511                 // it should be always at least 8 bytes - FIXME validate
512                 asf->packet_obj_size = get_le32(pb);
513                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
514                 if (asf->packet_replic_size > 8)
515                     url_fskip(pb, asf->packet_replic_size - 8);
516                 rsize += asf->packet_replic_size; // FIXME - check validity
517             } else if (asf->packet_replic_size==1){
518                 // multipacket - frag_offset is begining timestamp
519                 asf->packet_time_start = asf->packet_frag_offset;
520                 asf->packet_frag_offset = 0;
521                 asf->packet_frag_timestamp = asf->packet_timestamp;
522
523                 asf->packet_time_delta = get_byte(pb);
524                 rsize++;
525             }else{
526                 assert(asf->packet_replic_size==0);
527             }
528             if (asf->packet_flags & 0x01) {
529                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
530 #undef DO_2BITS
531                 //printf("Fragsize %d\n", asf->packet_frag_size);
532             } else {
533                 asf->packet_frag_size = asf->packet_size_left - rsize;
534                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
535             }
536             if (asf->packet_replic_size == 1) {
537                 asf->packet_multi_size = asf->packet_frag_size;
538                 if (asf->packet_multi_size > asf->packet_size_left) {
539                     asf->packet_segments = 0;
540                     continue;
541                 }
542             }
543             asf->packet_size_left -= rsize;
544             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
545
546             if (asf->stream_index < 0) {
547                 asf->packet_time_start = 0;
548                 /* unhandled packet (should not happen) */
549                 url_fskip(pb, asf->packet_frag_size);
550                 asf->packet_size_left -= asf->packet_frag_size;
551                 av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
552                 continue;
553             }
554             asf->asf_st = s->streams[asf->stream_index]->priv_data;
555         }
556         asf_st = asf->asf_st;
557
558         if ((asf->packet_frag_offset != asf_st->frag_offset
559              || (asf->packet_frag_offset
560                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
561            ) {
562             /* cannot continue current packet: free it */
563             // FIXME better check if packet was already allocated
564             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
565                    asf_st->pkt.size,
566                    asf->packet_obj_size,
567                    asf->packet_frag_offset, asf_st->frag_offset,
568                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
569             if (asf_st->pkt.size)
570                 av_free_packet(&asf_st->pkt);
571             asf_st->frag_offset = 0;
572             if (asf->packet_frag_offset != 0) {
573                 url_fskip(pb, asf->packet_frag_size);
574                 av_log(s, AV_LOG_INFO, "ff asf parser skiping %db\n", asf->packet_frag_size);
575                 asf->packet_size_left -= asf->packet_frag_size;
576                 continue;
577             }
578         }
579         if (asf->packet_replic_size == 1) {
580             // frag_offset is here used as the begining timestamp
581             asf->packet_frag_timestamp = asf->packet_time_start;
582             asf->packet_time_start += asf->packet_time_delta;
583             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
584             asf->packet_size_left--;
585             asf->packet_multi_size--;
586             if (asf->packet_multi_size < asf->packet_obj_size)
587             {
588                 asf->packet_time_start = 0;
589                 url_fskip(pb, asf->packet_multi_size);
590                 asf->packet_size_left -= asf->packet_multi_size;
591                 continue;
592             }
593             asf->packet_multi_size -= asf->packet_obj_size;
594             //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);
595         }
596         if (asf_st->frag_offset == 0) {
597             /* new packet */
598             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
599             asf_st->seq = asf->packet_seq;
600             asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;
601             asf_st->pkt.stream_index = asf->stream_index;
602             asf_st->packet_pos= asf->packet_pos;            
603 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n", 
604 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
605 //s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
606             if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO) 
607                 asf->packet_key_frame = 1;
608             if (asf->packet_key_frame)
609                 asf_st->pkt.flags |= PKT_FLAG_KEY;
610         }
611
612         /* read data */
613         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
614         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
615         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
616         asf->packet_size_left -= asf->packet_frag_size;
617         if (asf->packet_size_left < 0)
618             continue;
619         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
620                    asf->packet_frag_size);
621         asf_st->frag_offset += asf->packet_frag_size;
622         /* test if whole packet is read */
623         if (asf_st->frag_offset == asf_st->pkt.size) {
624             /* return packet */
625             if (asf_st->ds_span > 1) {
626                 /* packet descrambling */
627                 char* newdata = av_malloc(asf_st->pkt.size);
628                 if (newdata) {
629                     int offset = 0;
630                     while (offset < asf_st->pkt.size) {
631                         int off = offset / asf_st->ds_chunk_size;
632                         int row = off / asf_st->ds_span;
633                         int col = off % asf_st->ds_span;
634                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
635                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
636                         memcpy(newdata + offset,
637                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
638                                asf_st->ds_chunk_size);
639                         offset += asf_st->ds_chunk_size;
640                     }
641                     av_free(asf_st->pkt.data);
642                     asf_st->pkt.data = newdata;
643                 }
644             }
645             asf_st->frag_offset = 0;
646             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
647             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
648             asf_st->pkt.size = 0;
649             asf_st->pkt.data = 0;
650             break; // packet completed
651         }
652     }
653     return 0;
654 }
655
656 static int asf_read_close(AVFormatContext *s)
657 {
658     int i;
659
660     for(i=0;i<s->nb_streams;i++) {
661         AVStream *st = s->streams[i];
662         av_free(st->priv_data);
663         av_free(st->codec.extradata);
664     av_free(st->codec.palctrl);
665     }
666     return 0;
667 }
668
669 // Added to support seeking after packets have been read
670 // If information is not reset, read_packet fails due to
671 // leftover information from previous reads
672 static void asf_reset_header(AVFormatContext *s)
673 {
674     ASFContext *asf = s->priv_data;
675     ASFStream *asf_st;
676     int i;
677
678     asf->packet_nb_frames = 0;
679     asf->packet_timestamp_start = -1;
680     asf->packet_timestamp_end = -1;
681     asf->packet_size_left = 0;
682     asf->packet_segments = 0;
683     asf->packet_flags = 0;
684     asf->packet_property = 0;
685     asf->packet_timestamp = 0;
686     asf->packet_segsizetype = 0;
687     asf->packet_segments = 0;
688     asf->packet_seq = 0;
689     asf->packet_replic_size = 0;
690     asf->packet_key_frame = 0;
691     asf->packet_padsize = 0;
692     asf->packet_frag_offset = 0;
693     asf->packet_frag_size = 0;
694     asf->packet_frag_timestamp = 0;
695     asf->packet_multi_size = 0;
696     asf->packet_obj_size = 0;
697     asf->packet_time_delta = 0;
698     asf->packet_time_start = 0;
699     
700     for(i=0; i<s->nb_streams; i++){
701         asf_st= s->streams[i]->priv_data;
702         av_free_packet(&asf_st->pkt);
703         asf_st->frag_offset=0;
704         asf_st->seq=0;
705     }
706     asf->asf_st= NULL;
707 }
708
709 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
710 {
711     ASFContext *asf = s->priv_data;
712     AVPacket pkt1, *pkt = &pkt1;
713     ASFStream *asf_st;
714     int64_t pts;
715     int64_t pos= *ppos;
716     int i;
717     int64_t start_pos[s->nb_streams];
718     
719     for(i=0; i<s->nb_streams; i++){
720         start_pos[i]= pos;
721     }
722     
723     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
724     *ppos= pos;
725     url_fseek(&s->pb, pos, SEEK_SET);
726     
727 //printf("asf_read_pts\n");
728     asf_reset_header(s);
729     for(;;){
730         if (av_read_frame(s, pkt) < 0){
731             av_log(s, AV_LOG_INFO, "seek failed\n");
732             return AV_NOPTS_VALUE;
733         }
734         
735         pts= pkt->pts * 1000 / AV_TIME_BASE;
736
737         av_free_packet(pkt);
738         if(pkt->flags&PKT_FLAG_KEY){
739             i= pkt->stream_index;
740
741             asf_st= s->streams[i]->priv_data;
742
743             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
744             pos= asf_st->packet_pos;
745
746             av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
747             start_pos[i]= asf_st->packet_pos + 1;
748             
749             if(pkt->stream_index == stream_index)
750                break;
751         }
752     }
753
754     *ppos= pos;
755 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
756
757     return pts;
758 }
759
760 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts)
761 {
762     ASFContext *asf = s->priv_data;
763     
764     if (asf->packet_size <= 0)
765         return -1;
766
767     if(av_seek_frame_binary(s, stream_index, pts)<0)
768         return -1;
769
770     asf_reset_header(s);
771     return 0;
772 }
773
774 static AVInputFormat asf_iformat = {
775     "asf",
776     "asf format",
777     sizeof(ASFContext),
778     asf_probe,
779     asf_read_header,
780     asf_read_packet,
781     asf_read_close,
782     asf_read_seek,
783     asf_read_pts,
784 };
785
786 #ifdef CONFIG_ENCODERS
787     extern AVOutputFormat asf_oformat;
788     extern AVOutputFormat asf_stream_oformat;
789 #endif //CONFIG_ENCODERS
790
791 int asf_init(void)
792 {
793     av_register_input_format(&asf_iformat);
794 #ifdef CONFIG_ENCODERS
795     av_register_output_format(&asf_oformat);
796     av_register_output_format(&asf_stream_oformat);
797 #endif //CONFIG_ENCODERS
798     return 0;
799 }