useless &0x80
[ffmpeg.git] / libavformat / asf.c
1 /*
2  * ASF compatible demuxer
3  * Copyright (c) 2000, 2001 Fabrice Bellard.
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 #include "avformat.h"
22 #include "riff.h"
23 #include "mpegaudio.h"
24 #include "asf.h"
25 #include "common.h"
26
27 #undef NDEBUG
28 #include <assert.h>
29
30 #define FRAME_HEADER_SIZE 17
31 // Fix Me! FRAME_HEADER_SIZE may be different.
32
33 static const GUID index_guid = {
34     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
35 };
36
37 /**********************************/
38 /* decoding */
39
40 //#define DEBUG
41
42 #ifdef DEBUG
43 #define PRINT_IF_GUID(g,cmp) \
44 if (!memcmp(g, &cmp, sizeof(GUID))) \
45     printf("(GUID: %s) ", #cmp)
46
47 static void print_guid(const GUID *g)
48 {
49     int i;
50     PRINT_IF_GUID(g, asf_header);
51     else PRINT_IF_GUID(g, file_header);
52     else PRINT_IF_GUID(g, stream_header);
53     else PRINT_IF_GUID(g, audio_stream);
54     else PRINT_IF_GUID(g, audio_conceal_none);
55     else PRINT_IF_GUID(g, video_stream);
56     else PRINT_IF_GUID(g, video_conceal_none);
57     else PRINT_IF_GUID(g, command_stream);
58     else PRINT_IF_GUID(g, comment_header);
59     else PRINT_IF_GUID(g, codec_comment_header);
60     else PRINT_IF_GUID(g, codec_comment1_header);
61     else PRINT_IF_GUID(g, data_header);
62     else PRINT_IF_GUID(g, index_guid);
63     else PRINT_IF_GUID(g, head1_guid);
64     else PRINT_IF_GUID(g, head2_guid);
65     else PRINT_IF_GUID(g, my_guid);
66     else PRINT_IF_GUID(g, ext_stream_header);
67     else PRINT_IF_GUID(g, extended_content_header);
68     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
69     else PRINT_IF_GUID(g, ext_stream_audio_stream);
70     else
71         printf("(GUID: unknown) ");
72     for(i=0;i<16;i++)
73         printf(" 0x%02x,", (*g)[i]);
74     printf("}\n");
75 }
76 #undef PRINT_IF_GUID
77 #endif
78
79 static void get_guid(ByteIOContext *s, GUID *g)
80 {
81     assert(sizeof(*g) == 16);
82     get_buffer(s, g, sizeof(*g));
83 }
84
85 #if 0
86 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
87 {
88     int len, c;
89     char *q;
90
91     len = get_le16(pb);
92     q = buf;
93     while (len > 0) {
94         c = get_le16(pb);
95         if ((q - buf) < buf_size - 1)
96             *q++ = c;
97         len--;
98     }
99     *q = '\0';
100 }
101 #endif
102
103 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
104 {
105     char* q = buf;
106     len /= 2;
107     while (len--) {
108         uint8_t tmp;
109         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
110     }
111     *q = '\0';
112 }
113
114 static int asf_probe(AVProbeData *pd)
115 {
116     /* check file header */
117     if (pd->buf_size <= 32)
118         return 0;
119
120     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
121         return AVPROBE_SCORE_MAX;
122     else
123         return 0;
124 }
125
126 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
127 {
128     ASFContext *asf = s->priv_data;
129     GUID g;
130     ByteIOContext *pb = &s->pb;
131     AVStream *st;
132     ASFStream *asf_st;
133     int size, i;
134     int64_t gsize;
135
136     get_guid(pb, &g);
137     if (memcmp(&g, &asf_header, sizeof(GUID)))
138         goto fail;
139     get_le64(pb);
140     get_le32(pb);
141     get_byte(pb);
142     get_byte(pb);
143     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
144     for(;;) {
145         get_guid(pb, &g);
146         gsize = get_le64(pb);
147 #ifdef DEBUG
148         printf("%08"PRIx64": ", url_ftell(pb) - 24);
149         print_guid(&g);
150         printf("  size=0x%"PRIx64"\n", gsize);
151 #endif
152         if (gsize < 24)
153             goto fail;
154         if (!memcmp(&g, &file_header, sizeof(GUID))) {
155             get_guid(pb, &asf->hdr.guid);
156             asf->hdr.file_size          = get_le64(pb);
157             asf->hdr.create_time        = get_le64(pb);
158             asf->hdr.packets_count      = get_le64(pb);
159             asf->hdr.send_time          = get_le64(pb);
160             asf->hdr.play_time          = get_le64(pb);
161             asf->hdr.preroll            = get_le32(pb);
162             asf->hdr.ignore             = get_le32(pb);
163             asf->hdr.flags              = get_le32(pb);
164             asf->hdr.min_pktsize        = get_le32(pb);
165             asf->hdr.max_pktsize        = get_le32(pb);
166             asf->hdr.max_bitrate        = get_le32(pb);
167             asf->packet_size = asf->hdr.max_pktsize;
168             asf->nb_packets = asf->hdr.packets_count;
169         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
170             int type, type_specific_size, sizeX;
171             uint64_t total_size;
172             unsigned int tag1;
173             int64_t pos1, pos2;
174             int test_for_ext_stream_audio;
175
176             pos1 = url_ftell(pb);
177
178             st = av_new_stream(s, 0);
179             if (!st)
180                 goto fail;
181             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
182             asf_st = av_mallocz(sizeof(ASFStream));
183             if (!asf_st)
184                 goto fail;
185             st->priv_data = asf_st;
186             st->start_time = asf->hdr.preroll;
187             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
188                 st->duration = asf->hdr.send_time /
189                     (10000000 / 1000) - st->start_time;
190             }
191             get_guid(pb, &g);
192
193             test_for_ext_stream_audio = 0;
194             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
195                 type = CODEC_TYPE_AUDIO;
196             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
197                 type = CODEC_TYPE_VIDEO;
198             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
199                 type = CODEC_TYPE_UNKNOWN;
200             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
201                 test_for_ext_stream_audio = 1;
202                 type = CODEC_TYPE_UNKNOWN;
203             } else {
204                 goto fail;
205             }
206             get_guid(pb, &g);
207             total_size = get_le64(pb);
208             type_specific_size = get_le32(pb);
209             get_le32(pb);
210             st->id = get_le16(pb) & 0x7f; /* stream id */
211             // mapping of asf ID to AV stream ID;
212             asf->asfid2avid[st->id] = s->nb_streams - 1;
213
214             get_le32(pb);
215
216             if (test_for_ext_stream_audio) {
217                 get_guid(pb, &g);
218                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
219                     type = CODEC_TYPE_AUDIO;
220                     get_guid(pb, &g);
221                     get_le32(pb);
222                     get_le32(pb);
223                     get_le32(pb);
224                     get_guid(pb, &g);
225                     get_le32(pb);
226                 }
227             }
228
229             st->codec->codec_type = type;
230             if (type == CODEC_TYPE_AUDIO) {
231                 get_wav_header(pb, st->codec, type_specific_size);
232                 st->need_parsing = 1;
233                 /* We have to init the frame size at some point .... */
234                 pos2 = url_ftell(pb);
235                 if (gsize > (pos2 + 8 - pos1 + 24)) {
236                     asf_st->ds_span = get_byte(pb);
237                     asf_st->ds_packet_size = get_le16(pb);
238                     asf_st->ds_chunk_size = get_le16(pb);
239                     asf_st->ds_data_size = get_le16(pb);
240                     asf_st->ds_silence_data = get_byte(pb);
241                 }
242                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
243                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
244                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
245                 if (asf_st->ds_span > 1) {
246                     if (!asf_st->ds_chunk_size
247                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
248                         asf_st->ds_span = 0; // disable descrambling
249                 }
250                 switch (st->codec->codec_id) {
251                 case CODEC_ID_MP3:
252                     st->codec->frame_size = MPA_FRAME_SIZE;
253                     break;
254                 case CODEC_ID_PCM_S16LE:
255                 case CODEC_ID_PCM_S16BE:
256                 case CODEC_ID_PCM_U16LE:
257                 case CODEC_ID_PCM_U16BE:
258                 case CODEC_ID_PCM_S8:
259                 case CODEC_ID_PCM_U8:
260                 case CODEC_ID_PCM_ALAW:
261                 case CODEC_ID_PCM_MULAW:
262                     st->codec->frame_size = 1;
263                     break;
264                 default:
265                     /* This is probably wrong, but it prevents a crash later */
266                     st->codec->frame_size = 1;
267                     break;
268                 }
269             } else if (type == CODEC_TYPE_VIDEO) {
270                 get_le32(pb);
271                 get_le32(pb);
272                 get_byte(pb);
273                 size = get_le16(pb); /* size */
274                 sizeX= get_le32(pb); /* size */
275                 st->codec->width = get_le32(pb);
276                 st->codec->height = get_le32(pb);
277                 /* not available for asf */
278                 get_le16(pb); /* panes */
279                 st->codec->bits_per_sample = get_le16(pb); /* depth */
280                 tag1 = get_le32(pb);
281                 url_fskip(pb, 20);
282 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
283                 size= sizeX;
284                 if (size > 40) {
285                     st->codec->extradata_size = size - 40;
286                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
287                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
288                 }
289
290         /* Extract palette from extradata if bpp <= 8 */
291         /* This code assumes that extradata contains only palette */
292         /* This is true for all paletted codecs implemented in ffmpeg */
293         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
294             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
295 #ifdef WORDS_BIGENDIAN
296             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
297                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
298 #else
299             memcpy(st->codec->palctrl->palette, st->codec->extradata,
300                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
301 #endif
302             st->codec->palctrl->palette_changed = 1;
303         }
304
305                 st->codec->codec_tag = tag1;
306                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
307                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
308                     st->need_parsing = 1;
309             }
310             pos2 = url_ftell(pb);
311             url_fskip(pb, gsize - (pos2 - pos1 + 24));
312         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
313             asf->data_object_offset = url_ftell(pb);
314             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
315             if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
316                 asf->data_object_size = gsize - 24;
317             } else {
318                 asf->data_object_size = (uint64_t)-1;
319             }
320             break;
321         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
322             int len1, len2, len3, len4, len5;
323
324             len1 = get_le16(pb);
325             len2 = get_le16(pb);
326             len3 = get_le16(pb);
327             len4 = get_le16(pb);
328             len5 = get_le16(pb);
329             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
330             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
331             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
332             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
333             url_fskip(pb, len5);
334        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
335                 int desc_count, i;
336
337                 desc_count = get_le16(pb);
338                 for(i=0;i<desc_count;i++)
339                 {
340                         int name_len,value_type,value_len;
341                         uint64_t value_num = 0;
342                         char *name, *value;
343
344                         name_len = get_le16(pb);
345                         name = av_malloc(name_len * 2);
346                         get_str16_nolen(pb, name_len, name, name_len * 2);
347                         value_type = get_le16(pb);
348                         value_len = get_le16(pb);
349                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
350                         {
351                                 value = av_malloc(value_len * 2);
352                                 get_str16_nolen(pb, value_len, value,
353                                         value_len * 2);
354                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
355                                 if (strcmp(name,"WM/Genre")==0) { pstrcpy(s->genre, sizeof(s->genre), value); }
356                                 av_free(value);
357                         }
358                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
359                         {
360                                 if (value_type==2) value_num = get_le32(pb);
361                                 if (value_type==3) value_num = get_le32(pb);
362                                 if (value_type==4) value_num = get_le64(pb);
363                                 if (value_type==5) value_num = get_le16(pb);
364                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
365                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
366                         }
367                         av_free(name);
368                 }
369         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
370             int ext_len, payload_ext_ct, stream_ct;
371             uint32_t ext_d;
372             int64_t pos_ex_st;
373             pos_ex_st = url_ftell(pb);
374
375             get_le64(pb);
376             get_le64(pb);
377             get_le32(pb);
378             get_le32(pb);
379             get_le32(pb);
380             get_le32(pb);
381             get_le32(pb);
382             get_le32(pb);
383             get_le32(pb);
384             get_le32(pb);
385             get_le16(pb);
386             get_le16(pb);
387             get_le64(pb);
388             stream_ct = get_le16(pb);
389             payload_ext_ct = get_le16(pb);
390
391             for (i=0; i<stream_ct; i++){
392                 get_le16(pb);
393                 ext_len = get_le16(pb);
394                 url_fseek(pb, ext_len, SEEK_CUR);
395             }
396
397             for (i=0; i<payload_ext_ct; i++){
398                 get_guid(pb, &g);
399                 ext_d=get_le16(pb);
400                 ext_len=get_le32(pb);
401                 url_fseek(pb, ext_len, SEEK_CUR);
402             }
403
404             // there could be a optional stream properties object to follow
405             // if so the next iteration will pick it up
406         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
407             int v1, v2;
408             get_guid(pb, &g);
409             v1 = get_le32(pb);
410             v2 = get_le16(pb);
411 #if 0
412         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
413             int len, v1, n, num;
414             char str[256], *q;
415             char tag[16];
416
417             get_guid(pb, &g);
418             print_guid(&g);
419
420             n = get_le32(pb);
421             for(i=0;i<n;i++) {
422                 num = get_le16(pb); /* stream number */
423                 get_str16(pb, str, sizeof(str));
424                 get_str16(pb, str, sizeof(str));
425                 len = get_le16(pb);
426                 q = tag;
427                 while (len > 0) {
428                     v1 = get_byte(pb);
429                     if ((q - tag) < sizeof(tag) - 1)
430                         *q++ = v1;
431                     len--;
432                 }
433                 *q = '\0';
434             }
435 #endif
436         } else if (url_feof(pb)) {
437             goto fail;
438         } else {
439             url_fseek(pb, gsize - 24, SEEK_CUR);
440         }
441     }
442     get_guid(pb, &g);
443     get_le64(pb);
444     get_byte(pb);
445     get_byte(pb);
446     if (url_feof(pb))
447         goto fail;
448     asf->data_offset = url_ftell(pb);
449     asf->packet_size_left = 0;
450
451     return 0;
452
453  fail:
454      for(i=0;i<s->nb_streams;i++) {
455         AVStream *st = s->streams[i];
456         if (st) {
457             av_free(st->priv_data);
458             av_free(st->codec->extradata);
459         }
460         av_free(st);
461     }
462     return -1;
463 }
464
465 #define DO_2BITS(bits, var, defval) \
466     switch (bits & 3) \
467     { \
468     case 3: var = get_le32(pb); rsize += 4; break; \
469     case 2: var = get_le16(pb); rsize += 2; break; \
470     case 1: var = get_byte(pb); rsize++; break; \
471     default: var = defval; break; \
472     }
473
474 static int asf_get_packet(AVFormatContext *s)
475 {
476     ASFContext *asf = s->priv_data;
477     ByteIOContext *pb = &s->pb;
478     uint32_t packet_length, padsize;
479     int rsize = 9;
480     int c;
481
482     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
483
484     c = get_byte(pb);
485     if (c != 0x82) {
486         if (!url_feof(pb))
487             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
488     }
489     if ((c & 0x0f) == 2) { // always true for now
490         if (get_le16(pb) != 0) {
491             if (!url_feof(pb))
492                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
493             return AVERROR_IO;
494         }
495         rsize+=2;
496 /*    }else{
497         if (!url_feof(pb))
498             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
499         return AVERROR_IO;*/
500     }
501
502     asf->packet_flags = get_byte(pb);
503     asf->packet_property = get_byte(pb);
504
505     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
506     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
507     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
508
509     //the following checks prevent overflows and infinite loops
510     if(packet_length >= (1U<<29)){
511         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
512         return 0; // FIXME this should be -1
513     }
514     if(padsize >= (1U<<29)){
515         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
516         return 0; // FIXME this should be -1
517     }
518
519     asf->packet_timestamp = get_le32(pb);
520     get_le16(pb); /* duration */
521     // rsize has at least 11 bytes which have to be present
522
523     if (asf->packet_flags & 0x01) {
524         asf->packet_segsizetype = get_byte(pb); rsize++;
525         asf->packet_segments = asf->packet_segsizetype & 0x3f;
526     } else {
527         asf->packet_segments = 1;
528         asf->packet_segsizetype = 0x80;
529     }
530     asf->packet_size_left = packet_length - padsize - rsize;
531     if (packet_length < asf->hdr.min_pktsize)
532         padsize += asf->hdr.min_pktsize - packet_length;
533     asf->packet_padsize = padsize;
534 #ifdef DEBUG
535     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
536 #endif
537     return 0;
538 }
539
540 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
541 {
542     ASFContext *asf = s->priv_data;
543     ASFStream *asf_st = 0;
544     ByteIOContext *pb = &s->pb;
545     //static int pc = 0;
546     for (;;) {
547         int rsize = 0;
548         if (asf->packet_size_left < FRAME_HEADER_SIZE
549             || asf->packet_segments < 1) {
550             //asf->packet_size_left <= asf->packet_padsize) {
551             int ret = asf->packet_size_left + asf->packet_padsize;
552             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
553             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
554                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
555             assert(ret>=0);
556             /* fail safe */
557             url_fskip(pb, ret);
558             asf->packet_pos= url_ftell(&s->pb);
559             if (asf->data_object_size != (uint64_t)-1 &&
560                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
561                 return AVERROR_IO; /* Do not exceed the size of the data object */
562             ret = asf_get_packet(s);
563             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
564             if (ret < 0 || url_feof(pb))
565                 return AVERROR_IO;
566             asf->packet_time_start = 0;
567             continue;
568         }
569         if (asf->packet_time_start == 0) {
570             /* read frame header */
571             int num = get_byte(pb);
572             asf->packet_segments--;
573             rsize++;
574             asf->packet_key_frame = num >> 7;
575             asf->stream_index = asf->asfid2avid[num & 0x7f];
576             // sequence should be ignored!
577             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
578             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
579             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
580 //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);
581             if (asf->packet_replic_size > 1) {
582                 assert(asf->packet_replic_size >= 8);
583                 // it should be always at least 8 bytes - FIXME validate
584                 asf->packet_obj_size = get_le32(pb);
585                 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
586                     av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
587                     continue;
588                 }
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 %"PRId64" stream %d stamp:%"PRId64"\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%"PRIx64", 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: %"PRId64"\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 };