df2003ad0b8fb2dc8cab0c2a673540406a472438
[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
22 #include "libavutil/common.h"
23 #include "libavcodec/mpegaudio.h"
24 #include "avformat.h"
25 #include "riff.h"
26 #include "asf.h"
27 #include "asfcrypt.h"
28
29 extern void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
30
31 #undef NDEBUG
32 #include <assert.h>
33
34 #define FRAME_HEADER_SIZE 17
35 // Fix Me! FRAME_HEADER_SIZE may be different.
36
37 static const GUID index_guid = {
38     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
39 };
40
41 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
42     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
43 };
44 /**********************************/
45 /* decoding */
46
47 //#define DEBUG
48
49 #ifdef DEBUG
50 #define PRINT_IF_GUID(g,cmp) \
51 if (!memcmp(g, &cmp, sizeof(GUID))) \
52     printf("(GUID: %s) ", #cmp)
53
54 static void print_guid(const GUID *g)
55 {
56     int i;
57     PRINT_IF_GUID(g, asf_header);
58     else PRINT_IF_GUID(g, file_header);
59     else PRINT_IF_GUID(g, stream_header);
60     else PRINT_IF_GUID(g, audio_stream);
61     else PRINT_IF_GUID(g, audio_conceal_none);
62     else PRINT_IF_GUID(g, video_stream);
63     else PRINT_IF_GUID(g, video_conceal_none);
64     else PRINT_IF_GUID(g, command_stream);
65     else PRINT_IF_GUID(g, comment_header);
66     else PRINT_IF_GUID(g, codec_comment_header);
67     else PRINT_IF_GUID(g, codec_comment1_header);
68     else PRINT_IF_GUID(g, data_header);
69     else PRINT_IF_GUID(g, index_guid);
70     else PRINT_IF_GUID(g, head1_guid);
71     else PRINT_IF_GUID(g, head2_guid);
72     else PRINT_IF_GUID(g, my_guid);
73     else PRINT_IF_GUID(g, ext_stream_header);
74     else PRINT_IF_GUID(g, extended_content_header);
75     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
76     else PRINT_IF_GUID(g, ext_stream_audio_stream);
77     else PRINT_IF_GUID(g, metadata_header);
78     else PRINT_IF_GUID(g, stream_bitrate_guid);
79     else
80         printf("(GUID: unknown) ");
81     for(i=0;i<16;i++)
82         printf(" 0x%02x,", (*g)[i]);
83     printf("}\n");
84 }
85 #undef PRINT_IF_GUID
86 #endif
87
88 static void get_guid(ByteIOContext *s, GUID *g)
89 {
90     assert(sizeof(*g) == 16);
91     get_buffer(s, *g, sizeof(*g));
92 }
93
94 #if 0
95 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
96 {
97     int len, c;
98     char *q;
99
100     len = get_le16(pb);
101     q = buf;
102     while (len > 0) {
103         c = get_le16(pb);
104         if ((q - buf) < buf_size - 1)
105             *q++ = c;
106         len--;
107     }
108     *q = '\0';
109 }
110 #endif
111
112 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
113 {
114     char* q = buf;
115     len /= 2;
116     while (len--) {
117         uint8_t tmp;
118         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
119     }
120     *q = '\0';
121 }
122
123 static int asf_probe(AVProbeData *pd)
124 {
125     /* check file header */
126     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
127         return AVPROBE_SCORE_MAX;
128     else
129         return 0;
130 }
131
132 static int get_value(ByteIOContext *pb, int type){
133     switch(type){
134         case 2: return get_le32(pb);
135         case 3: return get_le32(pb);
136         case 4: return get_le64(pb);
137         case 5: return get_le16(pb);
138         default:return INT_MIN;
139     }
140 }
141
142 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
143 {
144     ASFContext *asf = s->priv_data;
145     GUID g;
146     ByteIOContext *pb = s->pb;
147     AVStream *st;
148     ASFStream *asf_st;
149     int size, i;
150     int64_t gsize;
151     AVRational dar[128];
152     uint32_t bitrate[128];
153
154     memset(dar, 0, sizeof(dar));
155     memset(bitrate, 0, sizeof(bitrate));
156
157     get_guid(pb, &g);
158     if (memcmp(&g, &asf_header, sizeof(GUID)))
159         return -1;
160     get_le64(pb);
161     get_le32(pb);
162     get_byte(pb);
163     get_byte(pb);
164     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
165     for(;;) {
166         get_guid(pb, &g);
167         gsize = get_le64(pb);
168 #ifdef DEBUG
169         printf("%08"PRIx64": ", url_ftell(pb) - 24);
170         print_guid(&g);
171         printf("  size=0x%"PRIx64"\n", gsize);
172 #endif
173         if (!memcmp(&g, &data_header, sizeof(GUID))) {
174             asf->data_object_offset = url_ftell(pb);
175             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
176             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
177                 asf->data_object_size = gsize - 24;
178             } else {
179                 asf->data_object_size = (uint64_t)-1;
180             }
181             break;
182         }
183         if (gsize < 24)
184             return -1;
185         if (!memcmp(&g, &file_header, sizeof(GUID))) {
186             get_guid(pb, &asf->hdr.guid);
187             asf->hdr.file_size          = get_le64(pb);
188             asf->hdr.create_time        = get_le64(pb);
189             asf->nb_packets             = get_le64(pb);
190             asf->hdr.play_time          = get_le64(pb);
191             asf->hdr.send_time          = get_le64(pb);
192             asf->hdr.preroll            = get_le32(pb);
193             asf->hdr.ignore             = get_le32(pb);
194             asf->hdr.flags              = get_le32(pb);
195             asf->hdr.min_pktsize        = get_le32(pb);
196             asf->hdr.max_pktsize        = get_le32(pb);
197             asf->hdr.max_bitrate        = get_le32(pb);
198             asf->packet_size = asf->hdr.max_pktsize;
199         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
200             int type, type_specific_size, sizeX;
201             uint64_t total_size;
202             unsigned int tag1;
203             int64_t pos1, pos2, start_time;
204             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
205
206             pos1 = url_ftell(pb);
207
208             st = av_new_stream(s, 0);
209             if (!st)
210                 return AVERROR(ENOMEM);
211             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
212             asf_st = av_mallocz(sizeof(ASFStream));
213             if (!asf_st)
214                 return AVERROR(ENOMEM);
215             st->priv_data = asf_st;
216             start_time = asf->hdr.preroll;
217
218             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
219                 st->duration = asf->hdr.send_time /
220                     (10000000 / 1000) - start_time;
221             }
222             get_guid(pb, &g);
223
224             test_for_ext_stream_audio = 0;
225             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
226                 type = CODEC_TYPE_AUDIO;
227             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
228                 type = CODEC_TYPE_VIDEO;
229             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
230                 type = CODEC_TYPE_UNKNOWN;
231             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
232                 test_for_ext_stream_audio = 1;
233                 type = CODEC_TYPE_UNKNOWN;
234             } else {
235                 return -1;
236             }
237             get_guid(pb, &g);
238             total_size = get_le64(pb);
239             type_specific_size = get_le32(pb);
240             get_le32(pb);
241             st->id = get_le16(pb) & 0x7f; /* stream id */
242             // mapping of asf ID to AV stream ID;
243             asf->asfid2avid[st->id] = s->nb_streams - 1;
244
245             get_le32(pb);
246
247             if (test_for_ext_stream_audio) {
248                 get_guid(pb, &g);
249                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
250                     type = CODEC_TYPE_AUDIO;
251                     is_dvr_ms_audio=1;
252                     get_guid(pb, &g);
253                     get_le32(pb);
254                     get_le32(pb);
255                     get_le32(pb);
256                     get_guid(pb, &g);
257                     get_le32(pb);
258                 }
259             }
260
261             st->codec->codec_type = type;
262             if (type == CODEC_TYPE_AUDIO) {
263                 get_wav_header(pb, st->codec, type_specific_size);
264                 if (is_dvr_ms_audio) {
265                     // codec_id and codec_tag are unreliable in dvr_ms
266                     // files. Set them later by probing stream.
267                     st->codec->codec_id = CODEC_ID_NONE;
268                     st->codec->codec_tag = 0;
269                 }
270                 st->need_parsing = AVSTREAM_PARSE_FULL;
271                 /* We have to init the frame size at some point .... */
272                 pos2 = url_ftell(pb);
273                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
274                     asf_st->ds_span = get_byte(pb);
275                     asf_st->ds_packet_size = get_le16(pb);
276                     asf_st->ds_chunk_size = get_le16(pb);
277                     get_le16(pb); //ds_data_size
278                     get_byte(pb); //ds_silence_data
279                 }
280                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
281                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
282                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
283                 if (asf_st->ds_span > 1) {
284                     if (!asf_st->ds_chunk_size
285                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
286                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
287                         asf_st->ds_span = 0; // disable descrambling
288                 }
289                 switch (st->codec->codec_id) {
290                 case CODEC_ID_MP3:
291                     st->codec->frame_size = MPA_FRAME_SIZE;
292                     break;
293                 case CODEC_ID_PCM_S16LE:
294                 case CODEC_ID_PCM_S16BE:
295                 case CODEC_ID_PCM_U16LE:
296                 case CODEC_ID_PCM_U16BE:
297                 case CODEC_ID_PCM_S8:
298                 case CODEC_ID_PCM_U8:
299                 case CODEC_ID_PCM_ALAW:
300                 case CODEC_ID_PCM_MULAW:
301                     st->codec->frame_size = 1;
302                     break;
303                 default:
304                     /* This is probably wrong, but it prevents a crash later */
305                     st->codec->frame_size = 1;
306                     break;
307                 }
308             } else if (type == CODEC_TYPE_VIDEO) {
309                 get_le32(pb);
310                 get_le32(pb);
311                 get_byte(pb);
312                 size = get_le16(pb); /* size */
313                 sizeX= get_le32(pb); /* size */
314                 st->codec->width = get_le32(pb);
315                 st->codec->height = get_le32(pb);
316                 /* not available for asf */
317                 get_le16(pb); /* panes */
318                 st->codec->bits_per_sample = get_le16(pb); /* depth */
319                 tag1 = get_le32(pb);
320                 url_fskip(pb, 20);
321 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
322                 size= sizeX;
323                 if (size > 40) {
324                     st->codec->extradata_size = size - 40;
325                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
326                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
327                 }
328
329         /* Extract palette from extradata if bpp <= 8 */
330         /* This code assumes that extradata contains only palette */
331         /* This is true for all paletted codecs implemented in ffmpeg */
332         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
333             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
334 #ifdef WORDS_BIGENDIAN
335             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
336                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
337 #else
338             memcpy(st->codec->palctrl->palette, st->codec->extradata,
339                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
340 #endif
341             st->codec->palctrl->palette_changed = 1;
342         }
343
344                 st->codec->codec_tag = tag1;
345                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
346                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
347                     st->need_parsing = AVSTREAM_PARSE_FULL;
348             }
349             pos2 = url_ftell(pb);
350             url_fskip(pb, gsize - (pos2 - pos1 + 24));
351         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
352             int len1, len2, len3, len4, len5;
353
354             len1 = get_le16(pb);
355             len2 = get_le16(pb);
356             len3 = get_le16(pb);
357             len4 = get_le16(pb);
358             len5 = get_le16(pb);
359             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
360             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
361             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
362             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
363             url_fskip(pb, len5);
364         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
365             int stream_count = get_le16(pb);
366             int j;
367
368 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
369 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
370             for(j = 0; j < stream_count; j++) {
371                 int flags, bitrate, stream_id;
372
373                 flags= get_le16(pb);
374                 bitrate= get_le32(pb);
375                 stream_id= (flags & 0x7f);
376 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
377                 asf->stream_bitrates[stream_id]= bitrate;
378             }
379        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
380                 int desc_count, i;
381
382                 desc_count = get_le16(pb);
383                 for(i=0;i<desc_count;i++)
384                 {
385                         int name_len,value_type,value_len;
386                         uint64_t value_num = 0;
387                         char name[1024];
388
389                         name_len = get_le16(pb);
390                         get_str16_nolen(pb, name_len, name, sizeof(name));
391                         value_type = get_le16(pb);
392                         value_len = get_le16(pb);
393                         if (value_type <= 1) // unicode or byte
394                         {
395                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
396                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
397                                 else if(!strcmp(name,"WM/Year"      )) {
398                                     char year[8];
399                                     get_str16_nolen(pb, value_len, year, sizeof(year));
400                                     s->year = atoi(year);
401                                 }
402                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {
403                                     char track[8];
404                                     get_str16_nolen(pb, value_len, track, sizeof(track));
405                                     s->track = strtol(track, NULL, 10) + 1;
406                                 }
407                                 else if(!strcmp(name,"WM/TrackNumber")) {
408                                     char track[8];
409                                     get_str16_nolen(pb, value_len, track, sizeof(track));
410                                     s->track = strtol(track, NULL, 10);
411                                 }
412                                 else url_fskip(pb, value_len);
413                         }
414                         else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
415                         {
416                                 value_num= get_value(pb, value_type);
417                                 if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
418                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
419                         }else
420                             url_fskip(pb, value_len);
421                 }
422         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
423             int n, stream_num, name_len, value_len, value_type, value_num;
424             n = get_le16(pb);
425
426             for(i=0;i<n;i++) {
427                 char name[1024];
428
429                 get_le16(pb); //lang_list_index
430                 stream_num= get_le16(pb);
431                 name_len=   get_le16(pb);
432                 value_type= get_le16(pb);
433                 value_len=  get_le32(pb);
434
435                 get_str16_nolen(pb, name_len, name, sizeof(name));
436 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
437                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
438                 url_fskip(pb, value_len - 2);
439
440                 if(stream_num<128){
441                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
442                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
443                 }
444             }
445         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
446             int ext_len, payload_ext_ct, stream_ct;
447             uint32_t ext_d, leak_rate, stream_num;
448             int64_t pos_ex_st;
449             pos_ex_st = url_ftell(pb);
450
451             get_le64(pb); // starttime
452             get_le64(pb); // endtime
453             leak_rate = get_le32(pb); // leak-datarate
454             get_le32(pb); // bucket-datasize
455             get_le32(pb); // init-bucket-fullness
456             get_le32(pb); // alt-leak-datarate
457             get_le32(pb); // alt-bucket-datasize
458             get_le32(pb); // alt-init-bucket-fullness
459             get_le32(pb); // max-object-size
460             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
461             stream_num = get_le16(pb); // stream-num
462             get_le16(pb); // stream-language-id-index
463             get_le64(pb); // avg frametime in 100ns units
464             stream_ct = get_le16(pb); //stream-name-count
465             payload_ext_ct = get_le16(pb); //payload-extension-system-count
466
467             if (stream_num < 128)
468                 bitrate[stream_num] = leak_rate;
469
470             for (i=0; i<stream_ct; i++){
471                 get_le16(pb);
472                 ext_len = get_le16(pb);
473                 url_fseek(pb, ext_len, SEEK_CUR);
474             }
475
476             for (i=0; i<payload_ext_ct; i++){
477                 get_guid(pb, &g);
478                 ext_d=get_le16(pb);
479                 ext_len=get_le32(pb);
480                 url_fseek(pb, ext_len, SEEK_CUR);
481             }
482
483             // there could be a optional stream properties object to follow
484             // if so the next iteration will pick it up
485         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
486             int v1, v2;
487             get_guid(pb, &g);
488             v1 = get_le32(pb);
489             v2 = get_le16(pb);
490 #if 0
491         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
492             int len, v1, n, num;
493             char str[256], *q;
494             char tag[16];
495
496             get_guid(pb, &g);
497             print_guid(&g);
498
499             n = get_le32(pb);
500             for(i=0;i<n;i++) {
501                 num = get_le16(pb); /* stream number */
502                 get_str16(pb, str, sizeof(str));
503                 get_str16(pb, str, sizeof(str));
504                 len = get_le16(pb);
505                 q = tag;
506                 while (len > 0) {
507                     v1 = get_byte(pb);
508                     if ((q - tag) < sizeof(tag) - 1)
509                         *q++ = v1;
510                     len--;
511                 }
512                 *q = '\0';
513             }
514 #endif
515         } else if (url_feof(pb)) {
516             return -1;
517         } else {
518             url_fseek(pb, gsize - 24, SEEK_CUR);
519         }
520     }
521     get_guid(pb, &g);
522     get_le64(pb);
523     get_byte(pb);
524     get_byte(pb);
525     if (url_feof(pb))
526         return -1;
527     asf->data_offset = url_ftell(pb);
528     asf->packet_size_left = 0;
529
530
531     for(i=0; i<128; i++){
532         int stream_num= asf->asfid2avid[i];
533         if(stream_num>=0){
534             AVCodecContext *codec= s->streams[stream_num]->codec;
535             if (!codec->bit_rate)
536                 codec->bit_rate = bitrate[i];
537             if (dar[i].num > 0 && dar[i].den > 0)
538                 av_reduce(&codec->sample_aspect_ratio.num,
539                           &codec->sample_aspect_ratio.den,
540                           dar[i].num, dar[i].den, INT_MAX);
541 //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);
542         }
543     }
544
545     return 0;
546 }
547
548 #define DO_2BITS(bits, var, defval) \
549     switch (bits & 3) \
550     { \
551     case 3: var = get_le32(pb); rsize += 4; break; \
552     case 2: var = get_le16(pb); rsize += 2; break; \
553     case 1: var = get_byte(pb); rsize++; break; \
554     default: var = defval; break; \
555     }
556
557 /**
558  *
559  * @return <0 in case of an error
560  */
561 static int asf_get_packet(AVFormatContext *s)
562 {
563     ASFContext *asf = s->priv_data;
564     ByteIOContext *pb = s->pb;
565     uint32_t packet_length, padsize;
566     int rsize = 8;
567     int c, d, e, off;
568
569     off= (url_ftell(s->pb) - s->data_offset) % asf->packet_size + 3;
570
571     c=d=e=-1;
572     while(off-- > 0){
573         c=d; d=e;
574         e= get_byte(pb);
575         if(c == 0x82 && !d && !e)
576             break;
577     }
578
579     if (c != 0x82) {
580         if (!url_feof(pb))
581             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
582     }
583     if ((c & 0x8f) == 0x82) {
584         if (d || e) {
585             if (!url_feof(pb))
586                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
587             return -1;
588         }
589         c= get_byte(pb);
590         d= get_byte(pb);
591         rsize+=3;
592     }else{
593         url_fseek(pb, -1, SEEK_CUR); //FIXME
594     }
595
596     asf->packet_flags    = c;
597     asf->packet_property = d;
598
599     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
600     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
601     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
602
603     //the following checks prevent overflows and infinite loops
604     if(packet_length >= (1U<<29)){
605         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
606         return -1;
607     }
608     if(padsize >= packet_length){
609         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
610         return -1;
611     }
612
613     asf->packet_timestamp = get_le32(pb);
614     get_le16(pb); /* duration */
615     // rsize has at least 11 bytes which have to be present
616
617     if (asf->packet_flags & 0x01) {
618         asf->packet_segsizetype = get_byte(pb); rsize++;
619         asf->packet_segments = asf->packet_segsizetype & 0x3f;
620     } else {
621         asf->packet_segments = 1;
622         asf->packet_segsizetype = 0x80;
623     }
624     asf->packet_size_left = packet_length - padsize - rsize;
625     if (packet_length < asf->hdr.min_pktsize)
626         padsize += asf->hdr.min_pktsize - packet_length;
627     asf->packet_padsize = padsize;
628 #ifdef DEBUG
629     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
630 #endif
631     return 0;
632 }
633
634 /**
635  *
636  * @return <0 if error
637  */
638 static int asf_read_frame_header(AVFormatContext *s){
639     ASFContext *asf = s->priv_data;
640     ByteIOContext *pb = s->pb;
641     int rsize = 1;
642     int num = get_byte(pb);
643     int64_t ts0, ts1;
644
645     asf->packet_segments--;
646     asf->packet_key_frame = num >> 7;
647     asf->stream_index = asf->asfid2avid[num & 0x7f];
648     // sequence should be ignored!
649     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
650     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
651     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
652 //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);
653     if (asf->packet_replic_size >= 8) {
654         asf->packet_obj_size = get_le32(pb);
655         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
656             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
657             return -1;
658         }
659         asf->packet_frag_timestamp = get_le32(pb); // timestamp
660         if(asf->packet_replic_size >= 8+38+4){
661 //            for(i=0; i<asf->packet_replic_size-8; i++)
662 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
663 //            av_log(s, AV_LOG_DEBUG, "\n");
664             url_fskip(pb, 10);
665             ts0= get_le64(pb);
666             ts1= get_le64(pb);
667             url_fskip(pb, 12);
668             get_le32(pb);
669             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
670             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
671             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
672         }else
673             url_fskip(pb, asf->packet_replic_size - 8);
674         rsize += asf->packet_replic_size; // FIXME - check validity
675     } else if (asf->packet_replic_size==1){
676         // multipacket - frag_offset is beginning timestamp
677         asf->packet_time_start = asf->packet_frag_offset;
678         asf->packet_frag_offset = 0;
679         asf->packet_frag_timestamp = asf->packet_timestamp;
680
681         asf->packet_time_delta = get_byte(pb);
682         rsize++;
683     }else if(asf->packet_replic_size!=0){
684         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
685         return -1;
686     }
687     if (asf->packet_flags & 0x01) {
688         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
689         if(asf->packet_frag_size > asf->packet_size_left - rsize){
690             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
691             return -1;
692         }
693         //printf("Fragsize %d\n", asf->packet_frag_size);
694     } else {
695         asf->packet_frag_size = asf->packet_size_left - rsize;
696         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
697     }
698     if (asf->packet_replic_size == 1) {
699         asf->packet_multi_size = asf->packet_frag_size;
700         if (asf->packet_multi_size > asf->packet_size_left)
701             return -1;
702     }
703     asf->packet_size_left -= rsize;
704     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
705
706     return 0;
707 }
708
709 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
710 {
711     ASFContext *asf = s->priv_data;
712     ASFStream *asf_st = 0;
713     ByteIOContext *pb = s->pb;
714     //static int pc = 0;
715     for (;;) {
716         if(url_feof(pb))
717             return AVERROR(EIO);
718         if (asf->packet_size_left < FRAME_HEADER_SIZE
719             || asf->packet_segments < 1) {
720             //asf->packet_size_left <= asf->packet_padsize) {
721             int ret = asf->packet_size_left + asf->packet_padsize;
722             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
723             assert(ret>=0);
724             /* fail safe */
725             url_fskip(pb, ret);
726
727             asf->packet_pos= url_ftell(s->pb);
728             if (asf->data_object_size != (uint64_t)-1 &&
729                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
730                 return AVERROR(EIO); /* Do not exceed the size of the data object */
731             ret = asf_get_packet(s);
732             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
733             if (ret < 0)
734                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
735             asf->packet_time_start = 0;
736             continue;
737         }
738         if (asf->packet_time_start == 0) {
739             if(asf_read_frame_header(s) < 0){
740                 asf->packet_segments= 0;
741                 continue;
742             }
743             if (asf->stream_index < 0
744                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
745                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
746                 ) {
747                 asf->packet_time_start = 0;
748                 /* unhandled packet (should not happen) */
749                 url_fskip(pb, asf->packet_frag_size);
750                 asf->packet_size_left -= asf->packet_frag_size;
751                 if(asf->stream_index < 0)
752                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
753                 continue;
754             }
755             asf->asf_st = s->streams[asf->stream_index]->priv_data;
756         }
757         asf_st = asf->asf_st;
758
759         if (asf->packet_replic_size == 1) {
760             // frag_offset is here used as the beginning timestamp
761             asf->packet_frag_timestamp = asf->packet_time_start;
762             asf->packet_time_start += asf->packet_time_delta;
763             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
764             asf->packet_size_left--;
765             asf->packet_multi_size--;
766             if (asf->packet_multi_size < asf->packet_obj_size)
767             {
768                 asf->packet_time_start = 0;
769                 url_fskip(pb, asf->packet_multi_size);
770                 asf->packet_size_left -= asf->packet_multi_size;
771                 continue;
772             }
773             asf->packet_multi_size -= asf->packet_obj_size;
774             //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);
775         }
776         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
777               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
778            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
779             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
780                 asf_st->frag_offset, asf->packet_frag_size,
781                 asf->packet_obj_size, asf_st->pkt.size);
782             asf->packet_obj_size= asf_st->pkt.size;
783         }
784
785         if (   asf_st->pkt.size != asf->packet_obj_size
786             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
787             if(asf_st->pkt.data){
788                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
789                 asf_st->frag_offset = 0;
790                 av_free_packet(&asf_st->pkt);
791             }
792             /* new packet */
793             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
794             asf_st->seq = asf->packet_seq;
795             asf_st->pkt.pts = asf->packet_frag_timestamp;
796             asf_st->pkt.stream_index = asf->stream_index;
797             asf_st->pkt.pos =
798             asf_st->packet_pos= asf->packet_pos;
799 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
800 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
801 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
802             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
803                 asf->packet_key_frame = 1;
804             if (asf->packet_key_frame)
805                 asf_st->pkt.flags |= PKT_FLAG_KEY;
806         }
807
808         /* read data */
809         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
810         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
811         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
812         asf->packet_size_left -= asf->packet_frag_size;
813         if (asf->packet_size_left < 0)
814             continue;
815
816         if(   asf->packet_frag_offset >= asf_st->pkt.size
817            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
818             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
819                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
820             continue;
821         }
822
823         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
824                    asf->packet_frag_size);
825         if (s->key && s->keylen == 20)
826             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
827                             asf->packet_frag_size);
828         asf_st->frag_offset += asf->packet_frag_size;
829         /* test if whole packet is read */
830         if (asf_st->frag_offset == asf_st->pkt.size) {
831             //workaround for macroshit radio DVR-MS files
832             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
833                && asf_st->pkt.size > 100){
834                 int i;
835                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
836                 if(i == asf_st->pkt.size){
837                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
838                     asf_st->frag_offset = 0;
839                     av_free_packet(&asf_st->pkt);
840                     continue;
841                 }
842             }
843
844             /* return packet */
845             if (asf_st->ds_span > 1) {
846               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
847                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
848               }else{
849                 /* packet descrambling */
850                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
851                 if (newdata) {
852                     int offset = 0;
853                     while (offset < asf_st->pkt.size) {
854                         int off = offset / asf_st->ds_chunk_size;
855                         int row = off / asf_st->ds_span;
856                         int col = off % asf_st->ds_span;
857                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
858                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
859
860                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
861                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
862                         memcpy(newdata + offset,
863                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
864                                asf_st->ds_chunk_size);
865                         offset += asf_st->ds_chunk_size;
866                     }
867                     av_free(asf_st->pkt.data);
868                     asf_st->pkt.data = newdata;
869                 }
870               }
871             }
872             asf_st->frag_offset = 0;
873             *pkt= asf_st->pkt;
874             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
875             asf_st->pkt.size = 0;
876             asf_st->pkt.data = 0;
877             break; // packet completed
878         }
879     }
880     return 0;
881 }
882
883 // Added to support seeking after packets have been read
884 // If information is not reset, read_packet fails due to
885 // leftover information from previous reads
886 static void asf_reset_header(AVFormatContext *s)
887 {
888     ASFContext *asf = s->priv_data;
889     ASFStream *asf_st;
890     int i;
891
892     asf->packet_nb_frames = 0;
893     asf->packet_size_left = 0;
894     asf->packet_segments = 0;
895     asf->packet_flags = 0;
896     asf->packet_property = 0;
897     asf->packet_timestamp = 0;
898     asf->packet_segsizetype = 0;
899     asf->packet_segments = 0;
900     asf->packet_seq = 0;
901     asf->packet_replic_size = 0;
902     asf->packet_key_frame = 0;
903     asf->packet_padsize = 0;
904     asf->packet_frag_offset = 0;
905     asf->packet_frag_size = 0;
906     asf->packet_frag_timestamp = 0;
907     asf->packet_multi_size = 0;
908     asf->packet_obj_size = 0;
909     asf->packet_time_delta = 0;
910     asf->packet_time_start = 0;
911
912     for(i=0; i<s->nb_streams; i++){
913         asf_st= s->streams[i]->priv_data;
914         av_free_packet(&asf_st->pkt);
915         asf_st->frag_offset=0;
916         asf_st->seq=0;
917     }
918     asf->asf_st= NULL;
919 }
920
921 static int asf_read_close(AVFormatContext *s)
922 {
923     int i;
924
925     asf_reset_header(s);
926     for(i=0;i<s->nb_streams;i++) {
927         AVStream *st = s->streams[i];
928         av_free(st->priv_data);
929         av_free(st->codec->palctrl);
930     }
931     return 0;
932 }
933
934 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
935 {
936     ASFContext *asf = s->priv_data;
937     AVPacket pkt1, *pkt = &pkt1;
938     ASFStream *asf_st;
939     int64_t pts;
940     int64_t pos= *ppos;
941     int i;
942     int64_t start_pos[s->nb_streams];
943
944     for(i=0; i<s->nb_streams; i++){
945         start_pos[i]= pos;
946     }
947
948     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
949     *ppos= pos;
950     url_fseek(s->pb, pos, SEEK_SET);
951
952 //printf("asf_read_pts\n");
953     asf_reset_header(s);
954     for(;;){
955         if (av_read_frame(s, pkt) < 0){
956             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
957             return AV_NOPTS_VALUE;
958         }
959
960         pts= pkt->pts;
961
962         av_free_packet(pkt);
963         if(pkt->flags&PKT_FLAG_KEY){
964             i= pkt->stream_index;
965
966             asf_st= s->streams[i]->priv_data;
967
968 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
969             pos= asf_st->packet_pos;
970
971             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
972             start_pos[i]= asf_st->packet_pos + 1;
973
974             if(pkt->stream_index == stream_index)
975                break;
976         }
977     }
978
979     *ppos= pos;
980 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
981
982     return pts;
983 }
984
985 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
986 {
987     GUID g;
988     ASFContext *asf = s->priv_data;
989     int64_t gsize, itime;
990     int64_t pos, current_pos, index_pts;
991     int i;
992     int pct,ict;
993
994     current_pos = url_ftell(s->pb);
995
996     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
997     get_guid(s->pb, &g);
998     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
999         gsize = get_le64(s->pb);
1000         get_guid(s->pb, &g);
1001         itime=get_le64(s->pb);
1002         pct=get_le32(s->pb);
1003         ict=get_le32(s->pb);
1004         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1005
1006         for (i=0;i<ict;i++){
1007             int pktnum=get_le32(s->pb);
1008             int pktct =get_le16(s->pb);
1009             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1010
1011             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1012             index_pts=av_rescale(itime, i, 10000);
1013
1014             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1015         }
1016         asf->index_read= 1;
1017     }
1018     url_fseek(s->pb, current_pos, SEEK_SET);
1019 }
1020
1021 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1022 {
1023     ASFContext *asf = s->priv_data;
1024     AVStream *st = s->streams[stream_index];
1025     int64_t pos;
1026     int index;
1027
1028     if (asf->packet_size <= 0)
1029         return -1;
1030
1031     /* Try using the protocol's read_seek if available */
1032     if(s->pb) {
1033         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1034         if(ret >= 0)
1035             asf_reset_header(s);
1036         if (ret != AVERROR(ENOSYS))
1037             return ret;
1038     }
1039
1040     if (!asf->index_read)
1041         asf_build_simple_index(s, stream_index);
1042
1043     if(!(asf->index_read && st->index_entries)){
1044         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1045             return -1;
1046     }else{
1047         index= av_index_search_timestamp(st, pts, flags);
1048         if(index<0)
1049             return -1;
1050
1051         /* find the position */
1052         pos = st->index_entries[index].pos;
1053         pts = st->index_entries[index].timestamp;
1054
1055     // various attempts to find key frame have failed so far
1056     //    asf_reset_header(s);
1057     //    url_fseek(s->pb, pos, SEEK_SET);
1058     //    key_pos = pos;
1059     //     for(i=0;i<16;i++){
1060     //         pos = url_ftell(s->pb);
1061     //         if (av_read_frame(s, &pkt) < 0){
1062     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1063     //             return -1;
1064     //         }
1065     //         asf_st = s->streams[stream_index]->priv_data;
1066     //         pos += st->parser->frame_offset;
1067     //
1068     //         if (pkt.size > b) {
1069     //             b = pkt.size;
1070     //             key_pos = pos;
1071     //         }
1072     //
1073     //         av_free_packet(&pkt);
1074     //     }
1075
1076         /* do the seek */
1077         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1078         url_fseek(s->pb, pos, SEEK_SET);
1079     }
1080     asf_reset_header(s);
1081     return 0;
1082 }
1083
1084 AVInputFormat asf_demuxer = {
1085     "asf",
1086     NULL_IF_CONFIG_SMALL("ASF format"),
1087     sizeof(ASFContext),
1088     asf_probe,
1089     asf_read_header,
1090     asf_read_packet,
1091     asf_read_close,
1092     asf_read_seek,
1093     asf_read_pts,
1094 };