cosmetics: Remove pointless period after copyright statement non-sentences.
[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 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     dprintf(NULL, "(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         dprintf(NULL, "(GUID: unknown) ");
81     for(i=0;i<16;i++)
82         dprintf(NULL, " 0x%02x,", (*g)[i]);
83     dprintf(NULL, "}\n");
84 }
85 #undef PRINT_IF_GUID
86 #else
87 #define print_guid(g)
88 #endif
89
90 static void get_guid(ByteIOContext *s, GUID *g)
91 {
92     assert(sizeof(*g) == 16);
93     get_buffer(s, *g, sizeof(*g));
94 }
95
96 #if 0
97 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
98 {
99     int len, c;
100     char *q;
101
102     len = get_le16(pb);
103     q = buf;
104     while (len > 0) {
105         c = get_le16(pb);
106         if ((q - buf) < buf_size - 1)
107             *q++ = c;
108         len--;
109     }
110     *q = '\0';
111 }
112 #endif
113
114 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
115 {
116     char* q = buf;
117     len /= 2;
118     while (len--) {
119         uint8_t tmp;
120         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
121     }
122     *q = '\0';
123 }
124
125 static int asf_probe(AVProbeData *pd)
126 {
127     /* check file header */
128     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
129         return AVPROBE_SCORE_MAX;
130     else
131         return 0;
132 }
133
134 static int get_value(ByteIOContext *pb, int type){
135     switch(type){
136         case 2: return get_le32(pb);
137         case 3: return get_le32(pb);
138         case 4: return get_le64(pb);
139         case 5: return get_le16(pb);
140         default:return INT_MIN;
141     }
142 }
143
144 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
145 {
146     ASFContext *asf = s->priv_data;
147     GUID g;
148     ByteIOContext *pb = s->pb;
149     AVStream *st;
150     ASFStream *asf_st;
151     int size, i;
152     int64_t gsize;
153     AVRational dar[128];
154     uint32_t bitrate[128];
155
156     memset(dar, 0, sizeof(dar));
157     memset(bitrate, 0, sizeof(bitrate));
158
159     get_guid(pb, &g);
160     if (memcmp(&g, &asf_header, sizeof(GUID)))
161         return -1;
162     get_le64(pb);
163     get_le32(pb);
164     get_byte(pb);
165     get_byte(pb);
166     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
167     for(;;) {
168         get_guid(pb, &g);
169         gsize = get_le64(pb);
170         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
171         print_guid(&g);
172         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
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             enum CodecType type;
201             int type_specific_size, sizeX;
202             uint64_t total_size;
203             unsigned int tag1;
204             int64_t pos1, pos2, start_time;
205             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
206
207             pos1 = url_ftell(pb);
208
209             st = av_new_stream(s, 0);
210             if (!st)
211                 return AVERROR(ENOMEM);
212             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
213             asf_st = av_mallocz(sizeof(ASFStream));
214             if (!asf_st)
215                 return AVERROR(ENOMEM);
216             st->priv_data = asf_st;
217             start_time = asf->hdr.preroll;
218
219             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
220                 st->duration = asf->hdr.send_time /
221                     (10000000 / 1000) - start_time;
222             }
223             get_guid(pb, &g);
224
225             test_for_ext_stream_audio = 0;
226             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
227                 type = CODEC_TYPE_AUDIO;
228             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
229                 type = CODEC_TYPE_VIDEO;
230             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
231                 type = CODEC_TYPE_DATA;
232             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
233                 test_for_ext_stream_audio = 1;
234                 type = CODEC_TYPE_UNKNOWN;
235             } else {
236                 return -1;
237             }
238             get_guid(pb, &g);
239             total_size = get_le64(pb);
240             type_specific_size = get_le32(pb);
241             get_le32(pb);
242             st->id = get_le16(pb) & 0x7f; /* stream id */
243             // mapping of asf ID to AV stream ID;
244             asf->asfid2avid[st->id] = s->nb_streams - 1;
245
246             get_le32(pb);
247
248             if (test_for_ext_stream_audio) {
249                 get_guid(pb, &g);
250                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
251                     type = CODEC_TYPE_AUDIO;
252                     is_dvr_ms_audio=1;
253                     get_guid(pb, &g);
254                     get_le32(pb);
255                     get_le32(pb);
256                     get_le32(pb);
257                     get_guid(pb, &g);
258                     get_le32(pb);
259                 }
260             }
261
262             st->codec->codec_type = type;
263             if (type == CODEC_TYPE_AUDIO) {
264                 get_wav_header(pb, st->codec, type_specific_size);
265                 if (is_dvr_ms_audio) {
266                     // codec_id and codec_tag are unreliable in dvr_ms
267                     // files. Set them later by probing stream.
268                     st->codec->codec_id = CODEC_ID_PROBE;
269                     st->codec->codec_tag = 0;
270                 }
271                 st->need_parsing = AVSTREAM_PARSE_FULL;
272                 /* We have to init the frame size at some point .... */
273                 pos2 = url_ftell(pb);
274                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
275                     asf_st->ds_span = get_byte(pb);
276                     asf_st->ds_packet_size = get_le16(pb);
277                     asf_st->ds_chunk_size = get_le16(pb);
278                     get_le16(pb); //ds_data_size
279                     get_byte(pb); //ds_silence_data
280                 }
281                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
282                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
283                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
284                 if (asf_st->ds_span > 1) {
285                     if (!asf_st->ds_chunk_size
286                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
287                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
288                         asf_st->ds_span = 0; // disable descrambling
289                 }
290                 switch (st->codec->codec_id) {
291                 case CODEC_ID_MP3:
292                     st->codec->frame_size = MPA_FRAME_SIZE;
293                     break;
294                 case CODEC_ID_PCM_S16LE:
295                 case CODEC_ID_PCM_S16BE:
296                 case CODEC_ID_PCM_U16LE:
297                 case CODEC_ID_PCM_U16BE:
298                 case CODEC_ID_PCM_S8:
299                 case CODEC_ID_PCM_U8:
300                 case CODEC_ID_PCM_ALAW:
301                 case CODEC_ID_PCM_MULAW:
302                     st->codec->frame_size = 1;
303                     break;
304                 default:
305                     /* This is probably wrong, but it prevents a crash later */
306                     st->codec->frame_size = 1;
307                     break;
308                 }
309             } else if (type == CODEC_TYPE_VIDEO) {
310                 get_le32(pb);
311                 get_le32(pb);
312                 get_byte(pb);
313                 size = get_le16(pb); /* size */
314                 sizeX= get_le32(pb); /* size */
315                 st->codec->width = get_le32(pb);
316                 st->codec->height = get_le32(pb);
317                 /* not available for asf */
318                 get_le16(pb); /* panes */
319                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
320                 tag1 = get_le32(pb);
321                 url_fskip(pb, 20);
322 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
323                 size= sizeX;
324                 if (size > 40) {
325                     st->codec->extradata_size = size - 40;
326                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
327                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
328                 }
329
330         /* Extract palette from extradata if bpp <= 8 */
331         /* This code assumes that extradata contains only palette */
332         /* This is true for all paletted codecs implemented in ffmpeg */
333         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
334             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
335 #ifdef WORDS_BIGENDIAN
336             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
337                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
338 #else
339             memcpy(st->codec->palctrl->palette, st->codec->extradata,
340                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
341 #endif
342             st->codec->palctrl->palette_changed = 1;
343         }
344
345                 st->codec->codec_tag = tag1;
346                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
347                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
348                     st->need_parsing = AVSTREAM_PARSE_FULL;
349             }
350             pos2 = url_ftell(pb);
351             url_fskip(pb, gsize - (pos2 - pos1 + 24));
352         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
353             int len1, len2, len3, len4, len5;
354
355             len1 = get_le16(pb);
356             len2 = get_le16(pb);
357             len3 = get_le16(pb);
358             len4 = get_le16(pb);
359             len5 = get_le16(pb);
360             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
361             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
362             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
363             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
364             url_fskip(pb, len5);
365         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
366             int stream_count = get_le16(pb);
367             int j;
368
369 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
370 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
371             for(j = 0; j < stream_count; j++) {
372                 int flags, bitrate, stream_id;
373
374                 flags= get_le16(pb);
375                 bitrate= get_le32(pb);
376                 stream_id= (flags & 0x7f);
377 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
378                 asf->stream_bitrates[stream_id]= bitrate;
379             }
380        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
381                 int desc_count, i;
382
383                 desc_count = get_le16(pb);
384                 for(i=0;i<desc_count;i++)
385                 {
386                         int name_len,value_type,value_len;
387                         uint64_t value_num = 0;
388                         char name[1024];
389
390                         name_len = get_le16(pb);
391                         get_str16_nolen(pb, name_len, name, sizeof(name));
392                         value_type = get_le16(pb);
393                         value_len = get_le16(pb);
394                         if (value_type <= 1) // unicode or byte
395                         {
396                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
397                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
398                                 else if(!strcmp(name,"WM/Year"      )) {
399                                     char year[8];
400                                     get_str16_nolen(pb, value_len, year, sizeof(year));
401                                     s->year = atoi(year);
402                                 }
403                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {
404                                     char track[8];
405                                     get_str16_nolen(pb, value_len, track, sizeof(track));
406                                     s->track = strtol(track, NULL, 10) + 1;
407                                 }
408                                 else if(!strcmp(name,"WM/TrackNumber")) {
409                                     char track[8];
410                                     get_str16_nolen(pb, value_len, track, sizeof(track));
411                                     s->track = strtol(track, NULL, 10);
412                                 }
413                                 else url_fskip(pb, value_len);
414                         }
415                         else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
416                         {
417                                 value_num= get_value(pb, value_type);
418                                 if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
419                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
420                         }else
421                             url_fskip(pb, value_len);
422                 }
423         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
424             int n, stream_num, name_len, value_len, value_type, value_num;
425             n = get_le16(pb);
426
427             for(i=0;i<n;i++) {
428                 char name[1024];
429
430                 get_le16(pb); //lang_list_index
431                 stream_num= get_le16(pb);
432                 name_len=   get_le16(pb);
433                 value_type= get_le16(pb);
434                 value_len=  get_le32(pb);
435
436                 get_str16_nolen(pb, name_len, name, sizeof(name));
437 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
438                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
439                 url_fskip(pb, value_len - 2);
440
441                 if(stream_num<128){
442                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
443                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
444                 }
445             }
446         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
447             int ext_len, payload_ext_ct, stream_ct;
448             uint32_t ext_d, leak_rate, stream_num;
449             int64_t pos_ex_st;
450             pos_ex_st = url_ftell(pb);
451
452             get_le64(pb); // starttime
453             get_le64(pb); // endtime
454             leak_rate = get_le32(pb); // leak-datarate
455             get_le32(pb); // bucket-datasize
456             get_le32(pb); // init-bucket-fullness
457             get_le32(pb); // alt-leak-datarate
458             get_le32(pb); // alt-bucket-datasize
459             get_le32(pb); // alt-init-bucket-fullness
460             get_le32(pb); // max-object-size
461             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
462             stream_num = get_le16(pb); // stream-num
463             get_le16(pb); // stream-language-id-index
464             get_le64(pb); // avg frametime in 100ns units
465             stream_ct = get_le16(pb); //stream-name-count
466             payload_ext_ct = get_le16(pb); //payload-extension-system-count
467
468             if (stream_num < 128)
469                 bitrate[stream_num] = leak_rate;
470
471             for (i=0; i<stream_ct; i++){
472                 get_le16(pb);
473                 ext_len = get_le16(pb);
474                 url_fseek(pb, ext_len, SEEK_CUR);
475             }
476
477             for (i=0; i<payload_ext_ct; i++){
478                 get_guid(pb, &g);
479                 ext_d=get_le16(pb);
480                 ext_len=get_le32(pb);
481                 url_fseek(pb, ext_len, SEEK_CUR);
482             }
483
484             // there could be a optional stream properties object to follow
485             // if so the next iteration will pick it up
486         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
487             int v1, v2;
488             get_guid(pb, &g);
489             v1 = get_le32(pb);
490             v2 = get_le16(pb);
491 #if 0
492         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
493             int len, v1, n, num;
494             char str[256], *q;
495             char tag[16];
496
497             get_guid(pb, &g);
498             print_guid(&g);
499
500             n = get_le32(pb);
501             for(i=0;i<n;i++) {
502                 num = get_le16(pb); /* stream number */
503                 get_str16(pb, str, sizeof(str));
504                 get_str16(pb, str, sizeof(str));
505                 len = get_le16(pb);
506                 q = tag;
507                 while (len > 0) {
508                     v1 = get_byte(pb);
509                     if ((q - tag) < sizeof(tag) - 1)
510                         *q++ = v1;
511                     len--;
512                 }
513                 *q = '\0';
514             }
515 #endif
516         } else if (url_feof(pb)) {
517             return -1;
518         } else {
519             url_fseek(pb, gsize - 24, SEEK_CUR);
520         }
521     }
522     get_guid(pb, &g);
523     get_le64(pb);
524     get_byte(pb);
525     get_byte(pb);
526     if (url_feof(pb))
527         return -1;
528     asf->data_offset = url_ftell(pb);
529     asf->packet_size_left = 0;
530
531
532     for(i=0; i<128; i++){
533         int stream_num= asf->asfid2avid[i];
534         if(stream_num>=0){
535             AVStream *st = s->streams[stream_num];
536             if (!st->codec->bit_rate)
537                 st->codec->bit_rate = bitrate[i];
538             if (dar[i].num > 0 && dar[i].den > 0)
539                 av_reduce(&st->sample_aspect_ratio.num,
540                           &st->sample_aspect_ratio.den,
541                           dar[i].num, dar[i].den, INT_MAX);
542 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
543         }
544     }
545
546     return 0;
547 }
548
549 #define DO_2BITS(bits, var, defval) \
550     switch (bits & 3) \
551     { \
552     case 3: var = get_le32(pb); rsize += 4; break; \
553     case 2: var = get_le16(pb); rsize += 2; break; \
554     case 1: var = get_byte(pb); rsize++; break; \
555     default: var = defval; break; \
556     }
557
558 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
559 {
560     ASFContext *asf = s->priv_data;
561     uint32_t packet_length, padsize;
562     int rsize = 8;
563     int c, d, e, off;
564
565     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
566
567     c=d=e=-1;
568     while(off-- > 0){
569         c=d; d=e;
570         e= get_byte(pb);
571         if(c == 0x82 && !d && !e)
572             break;
573     }
574
575     if (c != 0x82) {
576         if (!url_feof(pb))
577             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
578     }
579     if ((c & 0x8f) == 0x82) {
580         if (d || e) {
581             if (!url_feof(pb))
582                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
583             return -1;
584         }
585         c= get_byte(pb);
586         d= get_byte(pb);
587         rsize+=3;
588     }else{
589         url_fseek(pb, -1, SEEK_CUR); //FIXME
590     }
591
592     asf->packet_flags    = c;
593     asf->packet_property = d;
594
595     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
596     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
597     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
598
599     //the following checks prevent overflows and infinite loops
600     if(packet_length >= (1U<<29)){
601         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
602         return -1;
603     }
604     if(padsize >= packet_length){
605         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
606         return -1;
607     }
608
609     asf->packet_timestamp = get_le32(pb);
610     get_le16(pb); /* duration */
611     // rsize has at least 11 bytes which have to be present
612
613     if (asf->packet_flags & 0x01) {
614         asf->packet_segsizetype = get_byte(pb); rsize++;
615         asf->packet_segments = asf->packet_segsizetype & 0x3f;
616     } else {
617         asf->packet_segments = 1;
618         asf->packet_segsizetype = 0x80;
619     }
620     asf->packet_size_left = packet_length - padsize - rsize;
621     if (packet_length < asf->hdr.min_pktsize)
622         padsize += asf->hdr.min_pktsize - packet_length;
623     asf->packet_padsize = padsize;
624     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
625     return 0;
626 }
627
628 /**
629  *
630  * @return <0 if error
631  */
632 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
633     ASFContext *asf = s->priv_data;
634     int rsize = 1;
635     int num = get_byte(pb);
636     int64_t ts0, ts1;
637
638     asf->packet_segments--;
639     asf->packet_key_frame = num >> 7;
640     asf->stream_index = asf->asfid2avid[num & 0x7f];
641     // sequence should be ignored!
642     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
643     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
644     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
645 //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);
646     if (asf->packet_replic_size >= 8) {
647         asf->packet_obj_size = get_le32(pb);
648         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
649             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
650             return -1;
651         }
652         asf->packet_frag_timestamp = get_le32(pb); // timestamp
653         if(asf->packet_replic_size >= 8+38+4){
654 //            for(i=0; i<asf->packet_replic_size-8; i++)
655 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
656 //            av_log(s, AV_LOG_DEBUG, "\n");
657             url_fskip(pb, 10);
658             ts0= get_le64(pb);
659             ts1= get_le64(pb);
660             url_fskip(pb, 12);
661             get_le32(pb);
662             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
663             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
664             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
665         }else
666             url_fskip(pb, asf->packet_replic_size - 8);
667         rsize += asf->packet_replic_size; // FIXME - check validity
668     } else if (asf->packet_replic_size==1){
669         // multipacket - frag_offset is beginning timestamp
670         asf->packet_time_start = asf->packet_frag_offset;
671         asf->packet_frag_offset = 0;
672         asf->packet_frag_timestamp = asf->packet_timestamp;
673
674         asf->packet_time_delta = get_byte(pb);
675         rsize++;
676     }else if(asf->packet_replic_size!=0){
677         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
678         return -1;
679     }
680     if (asf->packet_flags & 0x01) {
681         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
682         if(asf->packet_frag_size > asf->packet_size_left - rsize){
683             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
684             return -1;
685         }
686         //printf("Fragsize %d\n", asf->packet_frag_size);
687     } else {
688         asf->packet_frag_size = asf->packet_size_left - rsize;
689         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
690     }
691     if (asf->packet_replic_size == 1) {
692         asf->packet_multi_size = asf->packet_frag_size;
693         if (asf->packet_multi_size > asf->packet_size_left)
694             return -1;
695     }
696     asf->packet_size_left -= rsize;
697     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
698
699     return 0;
700 }
701
702 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
703 {
704     ASFContext *asf = s->priv_data;
705     ASFStream *asf_st = 0;
706     for (;;) {
707         if(url_feof(pb))
708             return AVERROR(EIO);
709         if (asf->packet_size_left < FRAME_HEADER_SIZE
710             || asf->packet_segments < 1) {
711             //asf->packet_size_left <= asf->packet_padsize) {
712             int ret = asf->packet_size_left + asf->packet_padsize;
713             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
714             assert(ret>=0);
715             /* fail safe */
716             url_fskip(pb, ret);
717
718             asf->packet_pos= url_ftell(pb);
719             if (asf->data_object_size != (uint64_t)-1 &&
720                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
721                 return AVERROR(EIO); /* Do not exceed the size of the data object */
722             return 1;
723         }
724         if (asf->packet_time_start == 0) {
725             if(asf_read_frame_header(s, pb) < 0){
726                 asf->packet_segments= 0;
727                 continue;
728             }
729             if (asf->stream_index < 0
730                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
731                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
732                 ) {
733                 asf->packet_time_start = 0;
734                 /* unhandled packet (should not happen) */
735                 url_fskip(pb, asf->packet_frag_size);
736                 asf->packet_size_left -= asf->packet_frag_size;
737                 if(asf->stream_index < 0)
738                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
739                 continue;
740             }
741             asf->asf_st = s->streams[asf->stream_index]->priv_data;
742         }
743         asf_st = asf->asf_st;
744
745         if (asf->packet_replic_size == 1) {
746             // frag_offset is here used as the beginning timestamp
747             asf->packet_frag_timestamp = asf->packet_time_start;
748             asf->packet_time_start += asf->packet_time_delta;
749             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
750             asf->packet_size_left--;
751             asf->packet_multi_size--;
752             if (asf->packet_multi_size < asf->packet_obj_size)
753             {
754                 asf->packet_time_start = 0;
755                 url_fskip(pb, asf->packet_multi_size);
756                 asf->packet_size_left -= asf->packet_multi_size;
757                 continue;
758             }
759             asf->packet_multi_size -= asf->packet_obj_size;
760             //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);
761         }
762         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
763               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
764            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
765             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
766                 asf_st->frag_offset, asf->packet_frag_size,
767                 asf->packet_obj_size, asf_st->pkt.size);
768             asf->packet_obj_size= asf_st->pkt.size;
769         }
770
771         if (   asf_st->pkt.size != asf->packet_obj_size
772             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
773             if(asf_st->pkt.data){
774                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
775                 asf_st->frag_offset = 0;
776                 av_free_packet(&asf_st->pkt);
777             }
778             /* new packet */
779             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
780             asf_st->seq = asf->packet_seq;
781             asf_st->pkt.dts = asf->packet_frag_timestamp;
782             asf_st->pkt.stream_index = asf->stream_index;
783             asf_st->pkt.pos =
784             asf_st->packet_pos= asf->packet_pos;
785 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
786 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
787 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
788             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
789                 asf->packet_key_frame = 1;
790             if (asf->packet_key_frame)
791                 asf_st->pkt.flags |= PKT_FLAG_KEY;
792         }
793
794         /* read data */
795         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
796         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
797         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
798         asf->packet_size_left -= asf->packet_frag_size;
799         if (asf->packet_size_left < 0)
800             continue;
801
802         if(   asf->packet_frag_offset >= asf_st->pkt.size
803            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
804             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
805                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
806             continue;
807         }
808
809         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
810                    asf->packet_frag_size);
811         if (s->key && s->keylen == 20)
812             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
813                             asf->packet_frag_size);
814         asf_st->frag_offset += asf->packet_frag_size;
815         /* test if whole packet is read */
816         if (asf_st->frag_offset == asf_st->pkt.size) {
817             //workaround for macroshit radio DVR-MS files
818             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
819                && asf_st->pkt.size > 100){
820                 int i;
821                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
822                 if(i == asf_st->pkt.size){
823                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
824                     asf_st->frag_offset = 0;
825                     av_free_packet(&asf_st->pkt);
826                     continue;
827                 }
828             }
829
830             /* return packet */
831             if (asf_st->ds_span > 1) {
832               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
833                     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);
834               }else{
835                 /* packet descrambling */
836                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
837                 if (newdata) {
838                     int offset = 0;
839                     while (offset < asf_st->pkt.size) {
840                         int off = offset / asf_st->ds_chunk_size;
841                         int row = off / asf_st->ds_span;
842                         int col = off % asf_st->ds_span;
843                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
844                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
845
846                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
847                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
848                         memcpy(newdata + offset,
849                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
850                                asf_st->ds_chunk_size);
851                         offset += asf_st->ds_chunk_size;
852                     }
853                     av_free(asf_st->pkt.data);
854                     asf_st->pkt.data = newdata;
855                 }
856               }
857             }
858             asf_st->frag_offset = 0;
859             *pkt= asf_st->pkt;
860             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
861             asf_st->pkt.size = 0;
862             asf_st->pkt.data = 0;
863             break; // packet completed
864         }
865     }
866     return 0;
867 }
868
869 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
870 {
871     ASFContext *asf = s->priv_data;
872
873     for (;;) {
874         int ret;
875
876         /* parse cached packets, if any */
877         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
878             return ret;
879         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
880             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
881         asf->packet_time_start = 0;
882     }
883
884     return 0;
885 }
886
887 // Added to support seeking after packets have been read
888 // If information is not reset, read_packet fails due to
889 // leftover information from previous reads
890 static void asf_reset_header(AVFormatContext *s)
891 {
892     ASFContext *asf = s->priv_data;
893     ASFStream *asf_st;
894     int i;
895
896     asf->packet_nb_frames = 0;
897     asf->packet_size_left = 0;
898     asf->packet_segments = 0;
899     asf->packet_flags = 0;
900     asf->packet_property = 0;
901     asf->packet_timestamp = 0;
902     asf->packet_segsizetype = 0;
903     asf->packet_segments = 0;
904     asf->packet_seq = 0;
905     asf->packet_replic_size = 0;
906     asf->packet_key_frame = 0;
907     asf->packet_padsize = 0;
908     asf->packet_frag_offset = 0;
909     asf->packet_frag_size = 0;
910     asf->packet_frag_timestamp = 0;
911     asf->packet_multi_size = 0;
912     asf->packet_obj_size = 0;
913     asf->packet_time_delta = 0;
914     asf->packet_time_start = 0;
915
916     for(i=0; i<s->nb_streams; i++){
917         asf_st= s->streams[i]->priv_data;
918         av_free_packet(&asf_st->pkt);
919         asf_st->frag_offset=0;
920         asf_st->seq=0;
921     }
922     asf->asf_st= NULL;
923 }
924
925 static int asf_read_close(AVFormatContext *s)
926 {
927     int i;
928
929     asf_reset_header(s);
930     for(i=0;i<s->nb_streams;i++) {
931         AVStream *st = s->streams[i];
932         av_free(st->codec->palctrl);
933     }
934     return 0;
935 }
936
937 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
938 {
939     ASFContext *asf = s->priv_data;
940     AVPacket pkt1, *pkt = &pkt1;
941     ASFStream *asf_st;
942     int64_t pts;
943     int64_t pos= *ppos;
944     int i;
945     int64_t start_pos[s->nb_streams];
946
947     for(i=0; i<s->nb_streams; i++){
948         start_pos[i]= pos;
949     }
950
951     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
952     *ppos= pos;
953     url_fseek(s->pb, pos, SEEK_SET);
954
955 //printf("asf_read_pts\n");
956     asf_reset_header(s);
957     for(;;){
958         if (av_read_frame(s, pkt) < 0){
959             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
960             return AV_NOPTS_VALUE;
961         }
962
963         pts= pkt->pts;
964
965         av_free_packet(pkt);
966         if(pkt->flags&PKT_FLAG_KEY){
967             i= pkt->stream_index;
968
969             asf_st= s->streams[i]->priv_data;
970
971 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
972             pos= asf_st->packet_pos;
973
974             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
975             start_pos[i]= asf_st->packet_pos + 1;
976
977             if(pkt->stream_index == stream_index)
978                break;
979         }
980     }
981
982     *ppos= pos;
983 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
984
985     return pts;
986 }
987
988 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
989 {
990     GUID g;
991     ASFContext *asf = s->priv_data;
992     int64_t gsize, itime;
993     int64_t pos, current_pos, index_pts;
994     int i;
995     int pct,ict;
996
997     current_pos = url_ftell(s->pb);
998
999     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1000     get_guid(s->pb, &g);
1001     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
1002         gsize = get_le64(s->pb);
1003         get_guid(s->pb, &g);
1004         itime=get_le64(s->pb);
1005         pct=get_le32(s->pb);
1006         ict=get_le32(s->pb);
1007         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1008
1009         for (i=0;i<ict;i++){
1010             int pktnum=get_le32(s->pb);
1011             int pktct =get_le16(s->pb);
1012             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1013
1014             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1015             index_pts=av_rescale(itime, i, 10000);
1016
1017             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1018         }
1019         asf->index_read= 1;
1020     }
1021     url_fseek(s->pb, current_pos, SEEK_SET);
1022 }
1023
1024 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1025 {
1026     ASFContext *asf = s->priv_data;
1027     AVStream *st = s->streams[stream_index];
1028     int64_t pos;
1029     int index;
1030
1031     if (asf->packet_size <= 0)
1032         return -1;
1033
1034     /* Try using the protocol's read_seek if available */
1035     if(s->pb) {
1036         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1037         if(ret >= 0)
1038             asf_reset_header(s);
1039         if (ret != AVERROR(ENOSYS))
1040             return ret;
1041     }
1042
1043     if (!asf->index_read)
1044         asf_build_simple_index(s, stream_index);
1045
1046     if(!(asf->index_read && st->index_entries)){
1047         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1048             return -1;
1049     }else{
1050         index= av_index_search_timestamp(st, pts, flags);
1051         if(index<0)
1052             return -1;
1053
1054         /* find the position */
1055         pos = st->index_entries[index].pos;
1056         pts = st->index_entries[index].timestamp;
1057
1058     // various attempts to find key frame have failed so far
1059     //    asf_reset_header(s);
1060     //    url_fseek(s->pb, pos, SEEK_SET);
1061     //    key_pos = pos;
1062     //     for(i=0;i<16;i++){
1063     //         pos = url_ftell(s->pb);
1064     //         if (av_read_frame(s, &pkt) < 0){
1065     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1066     //             return -1;
1067     //         }
1068     //         asf_st = s->streams[stream_index]->priv_data;
1069     //         pos += st->parser->frame_offset;
1070     //
1071     //         if (pkt.size > b) {
1072     //             b = pkt.size;
1073     //             key_pos = pos;
1074     //         }
1075     //
1076     //         av_free_packet(&pkt);
1077     //     }
1078
1079         /* do the seek */
1080         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1081         url_fseek(s->pb, pos, SEEK_SET);
1082     }
1083     asf_reset_header(s);
1084     return 0;
1085 }
1086
1087 AVInputFormat asf_demuxer = {
1088     "asf",
1089     NULL_IF_CONFIG_SMALL("ASF format"),
1090     sizeof(ASFContext),
1091     asf_probe,
1092     asf_read_header,
1093     asf_read_packet,
1094     asf_read_close,
1095     asf_read_seek,
1096     asf_read_pts,
1097 };