019aac3bff8683b4acce567308d0ec30d66399f3
[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 PRINT_IF_GUID(g, metadata_header);
71     else
72         printf("(GUID: unknown) ");
73     for(i=0;i<16;i++)
74         printf(" 0x%02x,", (*g)[i]);
75     printf("}\n");
76 }
77 #undef PRINT_IF_GUID
78 #endif
79
80 static void get_guid(ByteIOContext *s, GUID *g)
81 {
82     assert(sizeof(*g) == 16);
83     get_buffer(s, g, sizeof(*g));
84 }
85
86 #if 0
87 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
88 {
89     int len, c;
90     char *q;
91
92     len = get_le16(pb);
93     q = buf;
94     while (len > 0) {
95         c = get_le16(pb);
96         if ((q - buf) < buf_size - 1)
97             *q++ = c;
98         len--;
99     }
100     *q = '\0';
101 }
102 #endif
103
104 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
105 {
106     char* q = buf;
107     len /= 2;
108     while (len--) {
109         uint8_t tmp;
110         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
111     }
112     *q = '\0';
113 }
114
115 static int asf_probe(AVProbeData *pd)
116 {
117     /* check file header */
118     if (pd->buf_size <= 32)
119         return 0;
120
121     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
122         return AVPROBE_SCORE_MAX;
123     else
124         return 0;
125 }
126
127 static int get_value(ByteIOContext *pb, int type){
128     switch(type){
129         case 2: return get_le32(pb);
130         case 3: return get_le32(pb);
131         case 4: return get_le64(pb);
132         case 5: return get_le16(pb);
133         default:return INT_MIN;
134     }
135 }
136
137 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
138 {
139     ASFContext *asf = s->priv_data;
140     GUID g;
141     ByteIOContext *pb = &s->pb;
142     AVStream *st;
143     ASFStream *asf_st;
144     int size, i;
145     int64_t gsize;
146     AVRational dar[128];
147
148     memset(dar, 0, sizeof(dar));
149
150     get_guid(pb, &g);
151     if (memcmp(&g, &asf_header, sizeof(GUID)))
152         goto fail;
153     get_le64(pb);
154     get_le32(pb);
155     get_byte(pb);
156     get_byte(pb);
157     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
158     for(;;) {
159         get_guid(pb, &g);
160         gsize = get_le64(pb);
161 #ifdef DEBUG
162         printf("%08"PRIx64": ", url_ftell(pb) - 24);
163         print_guid(&g);
164         printf("  size=0x%"PRIx64"\n", gsize);
165 #endif
166         if (gsize < 24)
167             goto fail;
168         if (!memcmp(&g, &file_header, sizeof(GUID))) {
169             get_guid(pb, &asf->hdr.guid);
170             asf->hdr.file_size          = get_le64(pb);
171             asf->hdr.create_time        = get_le64(pb);
172             asf->nb_packets             = get_le64(pb);
173             asf->hdr.send_time          = get_le64(pb);
174             asf->hdr.play_time          = get_le64(pb);
175             asf->hdr.preroll            = get_le32(pb);
176             asf->hdr.ignore             = get_le32(pb);
177             asf->hdr.flags              = get_le32(pb);
178             asf->hdr.min_pktsize        = get_le32(pb);
179             asf->hdr.max_pktsize        = get_le32(pb);
180             asf->hdr.max_bitrate        = get_le32(pb);
181             asf->packet_size = asf->hdr.max_pktsize;
182         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
183             int type, type_specific_size, sizeX;
184             uint64_t total_size;
185             unsigned int tag1;
186             int64_t pos1, pos2;
187             int test_for_ext_stream_audio;
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;
200             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
201                 st->duration = asf->hdr.send_time /
202                     (10000000 / 1000) - st->start_time;
203             }
204             get_guid(pb, &g);
205
206             test_for_ext_stream_audio = 0;
207             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
208                 type = CODEC_TYPE_AUDIO;
209             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
210                 type = CODEC_TYPE_VIDEO;
211             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
212                 type = CODEC_TYPE_UNKNOWN;
213             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
214                 test_for_ext_stream_audio = 1;
215                 type = CODEC_TYPE_UNKNOWN;
216             } else {
217                 goto fail;
218             }
219             get_guid(pb, &g);
220             total_size = get_le64(pb);
221             type_specific_size = get_le32(pb);
222             get_le32(pb);
223             st->id = get_le16(pb) & 0x7f; /* stream id */
224             // mapping of asf ID to AV stream ID;
225             asf->asfid2avid[st->id] = s->nb_streams - 1;
226
227             get_le32(pb);
228
229             if (test_for_ext_stream_audio) {
230                 get_guid(pb, &g);
231                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
232                     type = CODEC_TYPE_AUDIO;
233                     get_guid(pb, &g);
234                     get_le32(pb);
235                     get_le32(pb);
236                     get_le32(pb);
237                     get_guid(pb, &g);
238                     get_le32(pb);
239                 }
240             }
241
242             st->codec->codec_type = type;
243             if (type == CODEC_TYPE_AUDIO) {
244                 get_wav_header(pb, st->codec, type_specific_size);
245                 st->need_parsing = 1;
246                 /* We have to init the frame size at some point .... */
247                 pos2 = url_ftell(pb);
248                 if (gsize > (pos2 + 8 - pos1 + 24)) {
249                     asf_st->ds_span = get_byte(pb);
250                     asf_st->ds_packet_size = get_le16(pb);
251                     asf_st->ds_chunk_size = get_le16(pb);
252                     get_le16(pb); //ds_data_size
253                     get_byte(pb); //ds_silence_data
254                 }
255                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
256                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
257                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
258                 if (asf_st->ds_span > 1) {
259                     if (!asf_st->ds_chunk_size
260                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
261                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
262                         asf_st->ds_span = 0; // disable descrambling
263                 }
264                 switch (st->codec->codec_id) {
265                 case CODEC_ID_MP3:
266                     st->codec->frame_size = MPA_FRAME_SIZE;
267                     break;
268                 case CODEC_ID_PCM_S16LE:
269                 case CODEC_ID_PCM_S16BE:
270                 case CODEC_ID_PCM_U16LE:
271                 case CODEC_ID_PCM_U16BE:
272                 case CODEC_ID_PCM_S8:
273                 case CODEC_ID_PCM_U8:
274                 case CODEC_ID_PCM_ALAW:
275                 case CODEC_ID_PCM_MULAW:
276                     st->codec->frame_size = 1;
277                     break;
278                 default:
279                     /* This is probably wrong, but it prevents a crash later */
280                     st->codec->frame_size = 1;
281                     break;
282                 }
283             } else if (type == CODEC_TYPE_VIDEO) {
284                 get_le32(pb);
285                 get_le32(pb);
286                 get_byte(pb);
287                 size = get_le16(pb); /* size */
288                 sizeX= get_le32(pb); /* size */
289                 st->codec->width = get_le32(pb);
290                 st->codec->height = get_le32(pb);
291                 /* not available for asf */
292                 get_le16(pb); /* panes */
293                 st->codec->bits_per_sample = get_le16(pb); /* depth */
294                 tag1 = get_le32(pb);
295                 url_fskip(pb, 20);
296 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
297                 size= sizeX;
298                 if (size > 40) {
299                     st->codec->extradata_size = size - 40;
300                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
301                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
302                 }
303
304         /* Extract palette from extradata if bpp <= 8 */
305         /* This code assumes that extradata contains only palette */
306         /* This is true for all paletted codecs implemented in ffmpeg */
307         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
308             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
309 #ifdef WORDS_BIGENDIAN
310             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
311                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
312 #else
313             memcpy(st->codec->palctrl->palette, st->codec->extradata,
314                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
315 #endif
316             st->codec->palctrl->palette_changed = 1;
317         }
318
319                 st->codec->codec_tag = tag1;
320                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
321                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
322                     st->need_parsing = 1;
323             }
324             pos2 = url_ftell(pb);
325             url_fskip(pb, gsize - (pos2 - pos1 + 24));
326         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
327             asf->data_object_offset = url_ftell(pb);
328             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
329             if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
330                 asf->data_object_size = gsize - 24;
331             } else {
332                 asf->data_object_size = (uint64_t)-1;
333             }
334             break;
335         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
336             int len1, len2, len3, len4, len5;
337
338             len1 = get_le16(pb);
339             len2 = get_le16(pb);
340             len3 = get_le16(pb);
341             len4 = get_le16(pb);
342             len5 = get_le16(pb);
343             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
344             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
345             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
346             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
347             url_fskip(pb, len5);
348        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
349                 int desc_count, i;
350
351                 desc_count = get_le16(pb);
352                 for(i=0;i<desc_count;i++)
353                 {
354                         int name_len,value_type,value_len;
355                         uint64_t value_num = 0;
356                         char name[1024];
357
358                         name_len = get_le16(pb);
359                         get_str16_nolen(pb, name_len, name, sizeof(name));
360                         value_type = get_le16(pb);
361                         value_len = get_le16(pb);
362                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
363                         {
364                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
365                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
366                                 else url_fskip(pb, value_len);
367                         }
368                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
369                         {
370                                 value_num= get_value(pb, value_type);
371                                 if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
372                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
373                         }
374                 }
375         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
376             int n, stream_num, name_len, value_len, value_type, value_num;
377             n = get_le16(pb);
378
379             for(i=0;i<n;i++) {
380                 char name[1024];
381
382                 get_le16(pb); //lang_list_index
383                 stream_num= get_le16(pb);
384                 name_len=   get_le16(pb);
385                 value_type= get_le16(pb);
386                 value_len=  get_le32(pb);
387
388                 get_str16_nolen(pb, name_len, name, sizeof(name));
389 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
390                 value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
391                 url_fskip(pb, value_len - 2);
392
393                 if(stream_num<128){
394                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
395                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
396                 }
397             }
398         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
399             int ext_len, payload_ext_ct, stream_ct;
400             uint32_t ext_d;
401             int64_t pos_ex_st;
402             pos_ex_st = url_ftell(pb);
403
404             get_le64(pb); // starttime
405             get_le64(pb); // endtime
406             get_le32(pb); // leak-datarate
407             get_le32(pb); // bucket-datasize
408             get_le32(pb); // init-bucket-fullness
409             get_le32(pb); // alt-leak-datarate
410             get_le32(pb); // alt-bucket-datasize
411             get_le32(pb); // alt-init-bucket-fullness
412             get_le32(pb); // max-object-size
413             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
414             get_le16(pb); // stream-num
415             get_le16(pb); // stream-language-id-index
416             get_le64(pb); // avg frametime in 100ns units
417             stream_ct = get_le16(pb); //stream-name-count
418             payload_ext_ct = get_le16(pb); //payload-extension-system-count
419
420             for (i=0; i<stream_ct; i++){
421                 get_le16(pb);
422                 ext_len = get_le16(pb);
423                 url_fseek(pb, ext_len, SEEK_CUR);
424             }
425
426             for (i=0; i<payload_ext_ct; i++){
427                 get_guid(pb, &g);
428                 ext_d=get_le16(pb);
429                 ext_len=get_le32(pb);
430                 url_fseek(pb, ext_len, SEEK_CUR);
431             }
432
433             // there could be a optional stream properties object to follow
434             // if so the next iteration will pick it up
435         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
436             int v1, v2;
437             get_guid(pb, &g);
438             v1 = get_le32(pb);
439             v2 = get_le16(pb);
440 #if 0
441         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
442             int len, v1, n, num;
443             char str[256], *q;
444             char tag[16];
445
446             get_guid(pb, &g);
447             print_guid(&g);
448
449             n = get_le32(pb);
450             for(i=0;i<n;i++) {
451                 num = get_le16(pb); /* stream number */
452                 get_str16(pb, str, sizeof(str));
453                 get_str16(pb, str, sizeof(str));
454                 len = get_le16(pb);
455                 q = tag;
456                 while (len > 0) {
457                     v1 = get_byte(pb);
458                     if ((q - tag) < sizeof(tag) - 1)
459                         *q++ = v1;
460                     len--;
461                 }
462                 *q = '\0';
463             }
464 #endif
465         } else if (url_feof(pb)) {
466             goto fail;
467         } else {
468             url_fseek(pb, gsize - 24, SEEK_CUR);
469         }
470     }
471     get_guid(pb, &g);
472     get_le64(pb);
473     get_byte(pb);
474     get_byte(pb);
475     if (url_feof(pb))
476         goto fail;
477     asf->data_offset = url_ftell(pb);
478     asf->packet_size_left = 0;
479
480
481     for(i=0; i<128; i++){
482         int stream_num= asf->asfid2avid[i];
483         if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
484             AVCodecContext *codec= s->streams[stream_num]->codec;
485             codec->sample_aspect_ratio=
486                 av_div_q(
487                     dar[i],
488                     (AVRational){codec->width, codec->height}
489                 );
490 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
491         }
492     }
493
494     return 0;
495
496  fail:
497      for(i=0;i<s->nb_streams;i++) {
498         AVStream *st = s->streams[i];
499         if (st) {
500             av_free(st->priv_data);
501             av_free(st->codec->extradata);
502         }
503         av_free(st);
504     }
505     return -1;
506 }
507
508 #define DO_2BITS(bits, var, defval) \
509     switch (bits & 3) \
510     { \
511     case 3: var = get_le32(pb); rsize += 4; break; \
512     case 2: var = get_le16(pb); rsize += 2; break; \
513     case 1: var = get_byte(pb); rsize++; break; \
514     default: var = defval; break; \
515     }
516
517 /**
518  *
519  * @return <0 in case of an error
520  */
521 static int asf_get_packet(AVFormatContext *s)
522 {
523     ASFContext *asf = s->priv_data;
524     ByteIOContext *pb = &s->pb;
525     uint32_t packet_length, padsize;
526     int rsize = 9;
527     int c, d, e, off;
528
529     off= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size + 3;
530
531     c=d=e=-1;
532     while(off-- > 0){
533         c=d; d=e;
534         e= get_byte(pb);
535         if(c == 0x82 && !d && !e)
536             break;
537     }
538
539     if (c != 0x82) {
540         if (!url_feof(pb))
541             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
542     }
543     if ((c & 0x0f) == 2) { // always true for now
544         if (d || e) {
545             if (!url_feof(pb))
546                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
547             return -1;
548         }
549         d= get_byte(pb);
550         e= get_byte(pb);
551         rsize+=2;
552 /*    }else{
553         if (!url_feof(pb))
554             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
555         return AVERROR_IO;*/
556     }
557
558     asf->packet_flags = d;
559     asf->packet_property = e;
560
561     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
562     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
563     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
564
565     //the following checks prevent overflows and infinite loops
566     if(packet_length >= (1U<<29)){
567         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
568         return -1;
569     }
570     if(padsize >= packet_length){
571         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
572         return -1;
573     }
574
575     asf->packet_timestamp = get_le32(pb);
576     get_le16(pb); /* duration */
577     // rsize has at least 11 bytes which have to be present
578
579     if (asf->packet_flags & 0x01) {
580         asf->packet_segsizetype = get_byte(pb); rsize++;
581         asf->packet_segments = asf->packet_segsizetype & 0x3f;
582     } else {
583         asf->packet_segments = 1;
584         asf->packet_segsizetype = 0x80;
585     }
586     asf->packet_size_left = packet_length - padsize - rsize;
587     if (packet_length < asf->hdr.min_pktsize)
588         padsize += asf->hdr.min_pktsize - packet_length;
589     asf->packet_padsize = padsize;
590 #ifdef DEBUG
591     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
592 #endif
593     return 0;
594 }
595
596 /**
597  *
598  * @return <0 if error
599  */
600 static int asf_read_frame_header(AVFormatContext *s){
601     ASFContext *asf = s->priv_data;
602     ByteIOContext *pb = &s->pb;
603     int rsize = 1;
604     int num = get_byte(pb);
605
606     asf->packet_segments--;
607     asf->packet_key_frame = num >> 7;
608     asf->stream_index = asf->asfid2avid[num & 0x7f];
609     // sequence should be ignored!
610     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
611     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
612     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
613 //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);
614     if (asf->packet_replic_size >= 8) {
615         asf->packet_obj_size = get_le32(pb);
616         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
617             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
618             return -1;
619         }
620         asf->packet_frag_timestamp = get_le32(pb); // timestamp
621         url_fskip(pb, asf->packet_replic_size - 8);
622         rsize += asf->packet_replic_size; // FIXME - check validity
623     } else if (asf->packet_replic_size==1){
624         // multipacket - frag_offset is begining timestamp
625         asf->packet_time_start = asf->packet_frag_offset;
626         asf->packet_frag_offset = 0;
627         asf->packet_frag_timestamp = asf->packet_timestamp;
628
629         asf->packet_time_delta = get_byte(pb);
630         rsize++;
631     }else if(asf->packet_replic_size!=0){
632         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
633         return -1;
634     }
635     if (asf->packet_flags & 0x01) {
636         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
637         if(asf->packet_frag_size > asf->packet_size_left - rsize){
638             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
639             return -1;
640         }
641         //printf("Fragsize %d\n", asf->packet_frag_size);
642     } else {
643         asf->packet_frag_size = asf->packet_size_left - rsize;
644         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
645     }
646     if (asf->packet_replic_size == 1) {
647         asf->packet_multi_size = asf->packet_frag_size;
648         if (asf->packet_multi_size > asf->packet_size_left)
649             return -1;
650     }
651     asf->packet_size_left -= rsize;
652     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
653
654     return 0;
655 }
656
657 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
658 {
659     ASFContext *asf = s->priv_data;
660     ASFStream *asf_st = 0;
661     ByteIOContext *pb = &s->pb;
662     //static int pc = 0;
663     for (;;) {
664         if(url_feof(pb))
665             return AVERROR_IO;
666         if (asf->packet_size_left < FRAME_HEADER_SIZE
667             || asf->packet_segments < 1) {
668             //asf->packet_size_left <= asf->packet_padsize) {
669             int ret = asf->packet_size_left + asf->packet_padsize;
670             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
671             assert(ret>=0);
672             /* fail safe */
673             url_fskip(pb, ret);
674
675             asf->packet_pos= url_ftell(&s->pb);
676             if (asf->data_object_size != (uint64_t)-1 &&
677                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
678                 return AVERROR_IO; /* Do not exceed the size of the data object */
679             ret = asf_get_packet(s);
680             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
681             if (ret < 0)
682                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
683             asf->packet_time_start = 0;
684             continue;
685         }
686         if (asf->packet_time_start == 0) {
687             if(asf_read_frame_header(s) < 0){
688                 asf->packet_segments= 0;
689                 continue;
690             }
691             if (asf->stream_index < 0
692                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
693                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
694                 ) {
695                 asf->packet_time_start = 0;
696                 /* unhandled packet (should not happen) */
697                 url_fskip(pb, asf->packet_frag_size);
698                 asf->packet_size_left -= asf->packet_frag_size;
699                 if(asf->stream_index < 0)
700                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
701                 continue;
702             }
703             asf->asf_st = s->streams[asf->stream_index]->priv_data;
704         }
705         asf_st = asf->asf_st;
706
707         if (asf->packet_replic_size == 1) {
708             // frag_offset is here used as the begining timestamp
709             asf->packet_frag_timestamp = asf->packet_time_start;
710             asf->packet_time_start += asf->packet_time_delta;
711             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
712             asf->packet_size_left--;
713             asf->packet_multi_size--;
714             if (asf->packet_multi_size < asf->packet_obj_size)
715             {
716                 asf->packet_time_start = 0;
717                 url_fskip(pb, asf->packet_multi_size);
718                 asf->packet_size_left -= asf->packet_multi_size;
719                 continue;
720             }
721             asf->packet_multi_size -= asf->packet_obj_size;
722             //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);
723         }
724         if (   asf_st->pkt.size != asf->packet_obj_size
725             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
726             if(asf_st->pkt.data){
727                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
728                 asf_st->frag_offset = 0;
729                 av_free_packet(&asf_st->pkt);
730             }
731             /* new packet */
732             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
733             asf_st->seq = asf->packet_seq;
734             asf_st->pkt.pts = asf->packet_frag_timestamp;
735             asf_st->pkt.stream_index = asf->stream_index;
736             asf_st->pkt.pos =
737             asf_st->packet_pos= asf->packet_pos;
738 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
739 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
740 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
741             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
742                 asf->packet_key_frame = 1;
743             if (asf->packet_key_frame)
744                 asf_st->pkt.flags |= PKT_FLAG_KEY;
745         }
746
747         /* read data */
748         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
749         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
750         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
751         asf->packet_size_left -= asf->packet_frag_size;
752         if (asf->packet_size_left < 0)
753             continue;
754
755         if(   asf->packet_frag_offset >= asf_st->pkt.size
756            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
757             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
758                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
759             continue;
760         }
761
762         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
763                    asf->packet_frag_size);
764         asf_st->frag_offset += asf->packet_frag_size;
765         /* test if whole packet is read */
766         if (asf_st->frag_offset == asf_st->pkt.size) {
767             /* return packet */
768             if (asf_st->ds_span > 1) {
769               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
770                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
771               }else{
772                 /* packet descrambling */
773                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
774                 if (newdata) {
775                     int offset = 0;
776                     while (offset < asf_st->pkt.size) {
777                         int off = offset / asf_st->ds_chunk_size;
778                         int row = off / asf_st->ds_span;
779                         int col = off % asf_st->ds_span;
780                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
781                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
782
783                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
784                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
785                         memcpy(newdata + offset,
786                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
787                                asf_st->ds_chunk_size);
788                         offset += asf_st->ds_chunk_size;
789                     }
790                     av_free(asf_st->pkt.data);
791                     asf_st->pkt.data = newdata;
792                 }
793               }
794             }
795             asf_st->frag_offset = 0;
796             *pkt= asf_st->pkt;
797             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
798             asf_st->pkt.size = 0;
799             asf_st->pkt.data = 0;
800             break; // packet completed
801         }
802     }
803     return 0;
804 }
805
806 static int asf_read_close(AVFormatContext *s)
807 {
808     int i;
809
810     for(i=0;i<s->nb_streams;i++) {
811         AVStream *st = s->streams[i];
812         av_free(st->priv_data);
813         av_free(st->codec->palctrl);
814     }
815     return 0;
816 }
817
818 // Added to support seeking after packets have been read
819 // If information is not reset, read_packet fails due to
820 // leftover information from previous reads
821 static void asf_reset_header(AVFormatContext *s)
822 {
823     ASFContext *asf = s->priv_data;
824     ASFStream *asf_st;
825     int i;
826
827     asf->packet_nb_frames = 0;
828     asf->packet_size_left = 0;
829     asf->packet_segments = 0;
830     asf->packet_flags = 0;
831     asf->packet_property = 0;
832     asf->packet_timestamp = 0;
833     asf->packet_segsizetype = 0;
834     asf->packet_segments = 0;
835     asf->packet_seq = 0;
836     asf->packet_replic_size = 0;
837     asf->packet_key_frame = 0;
838     asf->packet_padsize = 0;
839     asf->packet_frag_offset = 0;
840     asf->packet_frag_size = 0;
841     asf->packet_frag_timestamp = 0;
842     asf->packet_multi_size = 0;
843     asf->packet_obj_size = 0;
844     asf->packet_time_delta = 0;
845     asf->packet_time_start = 0;
846
847     for(i=0; i<s->nb_streams; i++){
848         asf_st= s->streams[i]->priv_data;
849         av_free_packet(&asf_st->pkt);
850         asf_st->frag_offset=0;
851         asf_st->seq=0;
852     }
853     asf->asf_st= NULL;
854 }
855
856 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
857 {
858     ASFContext *asf = s->priv_data;
859     AVPacket pkt1, *pkt = &pkt1;
860     ASFStream *asf_st;
861     int64_t pts;
862     int64_t pos= *ppos;
863     int i;
864     int64_t start_pos[s->nb_streams];
865
866     for(i=0; i<s->nb_streams; i++){
867         start_pos[i]= pos;
868     }
869
870     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
871     *ppos= pos;
872     url_fseek(&s->pb, pos, SEEK_SET);
873
874 //printf("asf_read_pts\n");
875     asf_reset_header(s);
876     for(;;){
877         if (av_read_frame(s, pkt) < 0){
878             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
879             return AV_NOPTS_VALUE;
880         }
881
882         pts= pkt->pts;
883
884         av_free_packet(pkt);
885         if(pkt->flags&PKT_FLAG_KEY){
886             i= pkt->stream_index;
887
888             asf_st= s->streams[i]->priv_data;
889
890 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
891             pos= asf_st->packet_pos;
892
893             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
894             start_pos[i]= asf_st->packet_pos + 1;
895
896             if(pkt->stream_index == stream_index)
897                break;
898         }
899     }
900
901     *ppos= pos;
902 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
903
904     return pts;
905 }
906
907 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
908 {
909     GUID g;
910     ASFContext *asf = s->priv_data;
911     int64_t gsize, itime;
912     int64_t pos, current_pos, index_pts;
913     int i;
914     int pct,ict;
915
916     current_pos = url_ftell(&s->pb);
917
918     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
919     get_guid(&s->pb, &g);
920     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
921         gsize = get_le64(&s->pb);
922         get_guid(&s->pb, &g);
923         itime=get_le64(&s->pb);
924         pct=get_le32(&s->pb);
925         ict=get_le32(&s->pb);
926         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
927
928         for (i=0;i<ict;i++){
929             int pktnum=get_le32(&s->pb);
930             int pktct =get_le16(&s->pb);
931             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
932
933             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
934             index_pts=av_rescale(itime, i, 10000);
935
936             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
937         }
938         asf->index_read= 1;
939     }
940     url_fseek(&s->pb, current_pos, SEEK_SET);
941 }
942
943 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
944 {
945     ASFContext *asf = s->priv_data;
946     AVStream *st = s->streams[stream_index];
947     int64_t pos;
948     int index;
949
950     if (asf->packet_size <= 0)
951         return -1;
952
953     if (!asf->index_read)
954         asf_build_simple_index(s, stream_index);
955
956     if(!(asf->index_read && st->index_entries)){
957         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
958             return -1;
959     }else{
960         index= av_index_search_timestamp(st, pts, flags);
961         if(index<0)
962             return -1;
963
964         /* find the position */
965         pos = st->index_entries[index].pos;
966         pts = st->index_entries[index].timestamp;
967
968     // various attempts to find key frame have failed so far
969     //    asf_reset_header(s);
970     //    url_fseek(&s->pb, pos, SEEK_SET);
971     //    key_pos = pos;
972     //     for(i=0;i<16;i++){
973     //         pos = url_ftell(&s->pb);
974     //         if (av_read_frame(s, &pkt) < 0){
975     //             av_log(s, AV_LOG_INFO, "seek failed\n");
976     //             return -1;
977     //         }
978     //         asf_st = s->streams[stream_index]->priv_data;
979     //         pos += st->parser->frame_offset;
980     //
981     //         if (pkt.size > b) {
982     //             b = pkt.size;
983     //             key_pos = pos;
984     //         }
985     //
986     //         av_free_packet(&pkt);
987     //     }
988
989         /* do the seek */
990         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
991         url_fseek(&s->pb, pos, SEEK_SET);
992     }
993     asf_reset_header(s);
994     return 0;
995 }
996
997 AVInputFormat asf_demuxer = {
998     "asf",
999     "asf format",
1000     sizeof(ASFContext),
1001     asf_probe,
1002     asf_read_header,
1003     asf_read_packet,
1004     asf_read_close,
1005     asf_read_seek,
1006     asf_read_pts,
1007 };