7759927f613d177ccb6c7ffcba51918b528ad3c5
[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., 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                 uint8_t *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, pts, pkt->size, 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         asf->index_read= 1;
872     }
873     url_fseek(&s->pb, current_pos, SEEK_SET);
874 }
875
876 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
877 {
878     ASFContext *asf = s->priv_data;
879     AVStream *st = s->streams[stream_index];
880     int64_t pos;
881     int index;
882
883     if (asf->packet_size <= 0)
884         return -1;
885
886     if (!asf->index_read)
887         asf_build_simple_index(s, stream_index);
888
889     if(!(asf->index_read && st->index_entries)){
890         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
891             return -1;
892     }else{
893         index= av_index_search_timestamp(st, pts, flags);
894         if(index<0)
895             return -1;
896
897         /* find the position */
898         pos = st->index_entries[index].pos;
899         pts = st->index_entries[index].timestamp;
900
901     // various attempts to find key frame have failed so far
902     //    asf_reset_header(s);
903     //    url_fseek(&s->pb, pos, SEEK_SET);
904     //    key_pos = pos;
905     //     for(i=0;i<16;i++){
906     //         pos = url_ftell(&s->pb);
907     //         if (av_read_frame(s, &pkt) < 0){
908     //             av_log(s, AV_LOG_INFO, "seek failed\n");
909     //             return -1;
910     //         }
911     //         asf_st = s->streams[stream_index]->priv_data;
912     //         pos += st->parser->frame_offset;
913     //
914     //         if (pkt.size > b) {
915     //             b = pkt.size;
916     //             key_pos = pos;
917     //         }
918     //
919     //         av_free_packet(&pkt);
920     //     }
921
922         /* do the seek */
923         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %Ld\n", pos);
924         url_fseek(&s->pb, pos, SEEK_SET);
925     }
926     asf_reset_header(s);
927     return 0;
928 }
929
930 AVInputFormat asf_demuxer = {
931     "asf",
932     "asf format",
933     sizeof(ASFContext),
934     asf_probe,
935     asf_read_header,
936     asf_read_packet,
937     asf_read_close,
938     asf_read_seek,
939     asf_read_pts,
940 };