comment vorbis objectype id
[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 #include "asfcrypt.h"
27
28 extern void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
29
30 #undef NDEBUG
31 #include <assert.h>
32
33 #define FRAME_HEADER_SIZE 17
34 // Fix Me! FRAME_HEADER_SIZE may be different.
35
36 static const GUID index_guid = {
37     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
38 };
39
40 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
41     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
42 };
43 /**********************************/
44 /* decoding */
45
46 //#define DEBUG
47
48 #ifdef DEBUG
49 #define PRINT_IF_GUID(g,cmp) \
50 if (!memcmp(g, &cmp, sizeof(GUID))) \
51     printf("(GUID: %s) ", #cmp)
52
53 static void print_guid(const GUID *g)
54 {
55     int i;
56     PRINT_IF_GUID(g, asf_header);
57     else PRINT_IF_GUID(g, file_header);
58     else PRINT_IF_GUID(g, stream_header);
59     else PRINT_IF_GUID(g, audio_stream);
60     else PRINT_IF_GUID(g, audio_conceal_none);
61     else PRINT_IF_GUID(g, video_stream);
62     else PRINT_IF_GUID(g, video_conceal_none);
63     else PRINT_IF_GUID(g, command_stream);
64     else PRINT_IF_GUID(g, comment_header);
65     else PRINT_IF_GUID(g, codec_comment_header);
66     else PRINT_IF_GUID(g, codec_comment1_header);
67     else PRINT_IF_GUID(g, data_header);
68     else PRINT_IF_GUID(g, index_guid);
69     else PRINT_IF_GUID(g, head1_guid);
70     else PRINT_IF_GUID(g, head2_guid);
71     else PRINT_IF_GUID(g, my_guid);
72     else PRINT_IF_GUID(g, ext_stream_header);
73     else PRINT_IF_GUID(g, extended_content_header);
74     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
75     else PRINT_IF_GUID(g, ext_stream_audio_stream);
76     else PRINT_IF_GUID(g, metadata_header);
77     else PRINT_IF_GUID(g, stream_bitrate_guid);
78     else
79         printf("(GUID: unknown) ");
80     for(i=0;i<16;i++)
81         printf(" 0x%02x,", (*g)[i]);
82     printf("}\n");
83 }
84 #undef PRINT_IF_GUID
85 #endif
86
87 static void get_guid(ByteIOContext *s, GUID *g)
88 {
89     assert(sizeof(*g) == 16);
90     get_buffer(s, g, sizeof(*g));
91 }
92
93 #if 0
94 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
95 {
96     int len, c;
97     char *q;
98
99     len = get_le16(pb);
100     q = buf;
101     while (len > 0) {
102         c = get_le16(pb);
103         if ((q - buf) < buf_size - 1)
104             *q++ = c;
105         len--;
106     }
107     *q = '\0';
108 }
109 #endif
110
111 static int is_mms(ByteIOContext *pb)
112 {
113     return url_fileno(pb) && url_fileno(pb)->prot &&
114          !strcmp(url_fileno(pb)->prot->name, "mmsh");
115 }
116
117 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
118 {
119     char* q = buf;
120     len /= 2;
121     while (len--) {
122         uint8_t tmp;
123         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
124     }
125     *q = '\0';
126 }
127
128 static int asf_probe(AVProbeData *pd)
129 {
130     /* check file header */
131     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
132         return AVPROBE_SCORE_MAX;
133     else
134         return 0;
135 }
136
137 static int get_value(ByteIOContext *pb, int type){
138     switch(type){
139         case 2: return get_le32(pb);
140         case 3: return get_le32(pb);
141         case 4: return get_le64(pb);
142         case 5: return get_le16(pb);
143         default:return INT_MIN;
144     }
145 }
146
147 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
148 {
149     ASFContext *asf = s->priv_data;
150     GUID g;
151     ByteIOContext *pb = s->pb;
152     AVStream *st;
153     ASFStream *asf_st;
154     int size, i;
155     int64_t gsize;
156     AVRational dar[128];
157     uint32_t bitrate[128];
158
159     memset(dar, 0, sizeof(dar));
160     memset(bitrate, 0, sizeof(bitrate));
161
162     get_guid(pb, &g);
163     if (memcmp(&g, &asf_header, sizeof(GUID)))
164         goto fail;
165     get_le64(pb);
166     get_le32(pb);
167     get_byte(pb);
168     get_byte(pb);
169     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
170     for(;;) {
171         get_guid(pb, &g);
172         gsize = get_le64(pb);
173 #ifdef DEBUG
174         printf("%08"PRIx64": ", url_ftell(pb) - 24);
175         print_guid(&g);
176         printf("  size=0x%"PRIx64"\n", gsize);
177 #endif
178         if (!memcmp(&g, &data_header, sizeof(GUID))) {
179             asf->data_object_offset = url_ftell(pb);
180             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
181             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
182                 asf->data_object_size = gsize - 24;
183             } else {
184                 asf->data_object_size = (uint64_t)-1;
185             }
186             break;
187         }
188         if (gsize < 24)
189             goto fail;
190         if (!memcmp(&g, &file_header, sizeof(GUID))) {
191             get_guid(pb, &asf->hdr.guid);
192             asf->hdr.file_size          = get_le64(pb);
193             asf->hdr.create_time        = get_le64(pb);
194             asf->nb_packets             = get_le64(pb);
195             asf->hdr.send_time          = get_le64(pb);
196             asf->hdr.play_time          = get_le64(pb);
197             asf->hdr.preroll            = get_le32(pb);
198             asf->hdr.ignore             = get_le32(pb);
199             asf->hdr.flags              = get_le32(pb);
200             asf->hdr.min_pktsize        = get_le32(pb);
201             asf->hdr.max_pktsize        = get_le32(pb);
202             asf->hdr.max_bitrate        = get_le32(pb);
203             asf->packet_size = asf->hdr.max_pktsize;
204         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
205             int type, type_specific_size, sizeX;
206             uint64_t total_size;
207             unsigned int tag1;
208             int64_t pos1, pos2, start_time;
209             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
210
211             pos1 = url_ftell(pb);
212
213             st = av_new_stream(s, 0);
214             if (!st)
215                 goto fail;
216             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
217             asf_st = av_mallocz(sizeof(ASFStream));
218             if (!asf_st)
219                 goto fail;
220             st->priv_data = asf_st;
221             start_time = asf->hdr.preroll;
222
223             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
224                 st->duration = asf->hdr.send_time /
225                     (10000000 / 1000) - start_time;
226             }
227             get_guid(pb, &g);
228
229             test_for_ext_stream_audio = 0;
230             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
231                 type = CODEC_TYPE_AUDIO;
232             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
233                 type = CODEC_TYPE_VIDEO;
234             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
235                 type = CODEC_TYPE_UNKNOWN;
236             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
237                 test_for_ext_stream_audio = 1;
238                 type = CODEC_TYPE_UNKNOWN;
239             } else {
240                 goto fail;
241             }
242             get_guid(pb, &g);
243             total_size = get_le64(pb);
244             type_specific_size = get_le32(pb);
245             get_le32(pb);
246             st->id = get_le16(pb) & 0x7f; /* stream id */
247             // mapping of asf ID to AV stream ID;
248             asf->asfid2avid[st->id] = s->nb_streams - 1;
249
250             get_le32(pb);
251
252             if (test_for_ext_stream_audio) {
253                 get_guid(pb, &g);
254                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
255                     type = CODEC_TYPE_AUDIO;
256                     is_dvr_ms_audio=1;
257                     get_guid(pb, &g);
258                     get_le32(pb);
259                     get_le32(pb);
260                     get_le32(pb);
261                     get_guid(pb, &g);
262                     get_le32(pb);
263                 }
264             }
265
266             st->codec->codec_type = type;
267             if (type == CODEC_TYPE_AUDIO) {
268                 get_wav_header(pb, st->codec, type_specific_size);
269                 if (is_dvr_ms_audio) {
270                     // codec_id and codec_tag are unreliable in dvr_ms
271                     // files. Set them later by probing stream.
272                     st->codec->codec_id = CODEC_ID_NONE;
273                     st->codec->codec_tag = 0;
274                 }
275                 st->need_parsing = AVSTREAM_PARSE_FULL;
276                 /* We have to init the frame size at some point .... */
277                 pos2 = url_ftell(pb);
278                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
279                     asf_st->ds_span = get_byte(pb);
280                     asf_st->ds_packet_size = get_le16(pb);
281                     asf_st->ds_chunk_size = get_le16(pb);
282                     get_le16(pb); //ds_data_size
283                     get_byte(pb); //ds_silence_data
284                 }
285                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
286                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
287                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
288                 if (asf_st->ds_span > 1) {
289                     if (!asf_st->ds_chunk_size
290                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
291                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
292                         asf_st->ds_span = 0; // disable descrambling
293                 }
294                 switch (st->codec->codec_id) {
295                 case CODEC_ID_MP3:
296                     st->codec->frame_size = MPA_FRAME_SIZE;
297                     break;
298                 case CODEC_ID_PCM_S16LE:
299                 case CODEC_ID_PCM_S16BE:
300                 case CODEC_ID_PCM_U16LE:
301                 case CODEC_ID_PCM_U16BE:
302                 case CODEC_ID_PCM_S8:
303                 case CODEC_ID_PCM_U8:
304                 case CODEC_ID_PCM_ALAW:
305                 case CODEC_ID_PCM_MULAW:
306                     st->codec->frame_size = 1;
307                     break;
308                 default:
309                     /* This is probably wrong, but it prevents a crash later */
310                     st->codec->frame_size = 1;
311                     break;
312                 }
313             } else if (type == CODEC_TYPE_VIDEO) {
314                 get_le32(pb);
315                 get_le32(pb);
316                 get_byte(pb);
317                 size = get_le16(pb); /* size */
318                 sizeX= get_le32(pb); /* size */
319                 st->codec->width = get_le32(pb);
320                 st->codec->height = get_le32(pb);
321                 /* not available for asf */
322                 get_le16(pb); /* panes */
323                 st->codec->bits_per_sample = get_le16(pb); /* depth */
324                 tag1 = get_le32(pb);
325                 url_fskip(pb, 20);
326 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
327                 size= sizeX;
328                 if (size > 40) {
329                     st->codec->extradata_size = size - 40;
330                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
331                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
332                 }
333
334         /* Extract palette from extradata if bpp <= 8 */
335         /* This code assumes that extradata contains only palette */
336         /* This is true for all paletted codecs implemented in ffmpeg */
337         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
338             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
339 #ifdef WORDS_BIGENDIAN
340             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
341                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
342 #else
343             memcpy(st->codec->palctrl->palette, st->codec->extradata,
344                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
345 #endif
346             st->codec->palctrl->palette_changed = 1;
347         }
348
349                 st->codec->codec_tag = tag1;
350                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
351                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
352                     st->need_parsing = AVSTREAM_PARSE_FULL;
353             }
354             pos2 = url_ftell(pb);
355             url_fskip(pb, gsize - (pos2 - pos1 + 24));
356         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
357             int len1, len2, len3, len4, len5;
358
359             len1 = get_le16(pb);
360             len2 = get_le16(pb);
361             len3 = get_le16(pb);
362             len4 = get_le16(pb);
363             len5 = get_le16(pb);
364             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
365             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
366             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
367             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
368             url_fskip(pb, len5);
369         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
370             int stream_count = get_le16(pb);
371             int j;
372
373 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
374 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
375             for(j = 0; j < stream_count; j++) {
376                 int flags, bitrate, stream_id;
377
378                 flags= get_le16(pb);
379                 bitrate= get_le32(pb);
380                 stream_id= (flags & 0x7f);
381 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
382                 asf->stream_bitrates[stream_id]= bitrate;
383             }
384        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
385                 int desc_count, i;
386
387                 desc_count = get_le16(pb);
388                 for(i=0;i<desc_count;i++)
389                 {
390                         int name_len,value_type,value_len;
391                         uint64_t value_num = 0;
392                         char name[1024];
393
394                         name_len = get_le16(pb);
395                         get_str16_nolen(pb, name_len, name, sizeof(name));
396                         value_type = get_le16(pb);
397                         value_len = get_le16(pb);
398                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
399                         {
400                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
401                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
402                                 else if(!strcmp(name,"WM/Year"      )) {
403                                     char year[8];
404                                     get_str16_nolen(pb, value_len, year, sizeof(year));
405                                     s->year = atoi(year);
406                                 }
407                                 else if(!strcmp(name,"WM/Track") && s->track == 0) {
408                                     char track[8];
409                                     get_str16_nolen(pb, value_len, track, sizeof(track));
410                                     s->track = strtol(track, NULL, 10) + 1;
411                                 }
412                                 else if(!strcmp(name,"WM/TrackNumber")) {
413                                     char track[8];
414                                     get_str16_nolen(pb, value_len, track, sizeof(track));
415                                     s->track = strtol(track, NULL, 10);
416                                 }
417                                 else url_fskip(pb, value_len);
418                         }
419                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
420                         {
421                                 value_num= get_value(pb, value_type);
422                                 if (!strcmp(name,"WM/Track"      ) && s->track == 0) s->track = value_num + 1;
423                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
424                         }
425                 }
426         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
427             int n, stream_num, name_len, value_len, value_type, value_num;
428             n = get_le16(pb);
429
430             for(i=0;i<n;i++) {
431                 char name[1024];
432
433                 get_le16(pb); //lang_list_index
434                 stream_num= get_le16(pb);
435                 name_len=   get_le16(pb);
436                 value_type= get_le16(pb);
437                 value_len=  get_le32(pb);
438
439                 get_str16_nolen(pb, name_len, name, sizeof(name));
440 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
441                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
442                 url_fskip(pb, value_len - 2);
443
444                 if(stream_num<128){
445                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
446                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
447                 }
448             }
449         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
450             int ext_len, payload_ext_ct, stream_ct;
451             uint32_t ext_d, leak_rate, stream_num;
452             int64_t pos_ex_st;
453             pos_ex_st = url_ftell(pb);
454
455             get_le64(pb); // starttime
456             get_le64(pb); // endtime
457             leak_rate = get_le32(pb); // leak-datarate
458             get_le32(pb); // bucket-datasize
459             get_le32(pb); // init-bucket-fullness
460             get_le32(pb); // alt-leak-datarate
461             get_le32(pb); // alt-bucket-datasize
462             get_le32(pb); // alt-init-bucket-fullness
463             get_le32(pb); // max-object-size
464             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
465             stream_num = get_le16(pb); // stream-num
466             get_le16(pb); // stream-language-id-index
467             get_le64(pb); // avg frametime in 100ns units
468             stream_ct = get_le16(pb); //stream-name-count
469             payload_ext_ct = get_le16(pb); //payload-extension-system-count
470
471             if (stream_num < 128)
472                 bitrate[stream_num] = leak_rate;
473
474             for (i=0; i<stream_ct; i++){
475                 get_le16(pb);
476                 ext_len = get_le16(pb);
477                 url_fseek(pb, ext_len, SEEK_CUR);
478             }
479
480             for (i=0; i<payload_ext_ct; i++){
481                 get_guid(pb, &g);
482                 ext_d=get_le16(pb);
483                 ext_len=get_le32(pb);
484                 url_fseek(pb, ext_len, SEEK_CUR);
485             }
486
487             // there could be a optional stream properties object to follow
488             // if so the next iteration will pick it up
489         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
490             int v1, v2;
491             get_guid(pb, &g);
492             v1 = get_le32(pb);
493             v2 = get_le16(pb);
494 #if 0
495         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
496             int len, v1, n, num;
497             char str[256], *q;
498             char tag[16];
499
500             get_guid(pb, &g);
501             print_guid(&g);
502
503             n = get_le32(pb);
504             for(i=0;i<n;i++) {
505                 num = get_le16(pb); /* stream number */
506                 get_str16(pb, str, sizeof(str));
507                 get_str16(pb, str, sizeof(str));
508                 len = get_le16(pb);
509                 q = tag;
510                 while (len > 0) {
511                     v1 = get_byte(pb);
512                     if ((q - tag) < sizeof(tag) - 1)
513                         *q++ = v1;
514                     len--;
515                 }
516                 *q = '\0';
517             }
518 #endif
519         } else if (url_feof(pb)) {
520             goto fail;
521         } else {
522             url_fseek(pb, gsize - 24, SEEK_CUR);
523         }
524     }
525     get_guid(pb, &g);
526     get_le64(pb);
527     get_byte(pb);
528     get_byte(pb);
529     if (url_feof(pb))
530         goto fail;
531     asf->data_offset = url_ftell(pb);
532     asf->packet_size_left = 0;
533
534
535     for(i=0; i<128; i++){
536         int stream_num= asf->asfid2avid[i];
537         if(stream_num>=0){
538             AVCodecContext *codec= s->streams[stream_num]->codec;
539             if (!codec->bit_rate)
540                 codec->bit_rate = bitrate[i];
541             if (dar[i].num > 0 && dar[i].den > 0)
542                 av_reduce(&codec->sample_aspect_ratio.num,
543                           &codec->sample_aspect_ratio.den,
544                           dar[i].num, dar[i].den, INT_MAX);
545 //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);
546         }
547     }
548
549 #ifdef CONFIG_MMSH_PROTOCOL
550     /* Give info about ourselves to the mms protocol */
551     if(is_mms(pb))
552         ff_mms_set_stream_selection(url_fileno(pb), s);
553 #endif
554
555     return 0;
556
557  fail:
558      for(i=0;i<s->nb_streams;i++) {
559         AVStream *st = s->streams[i];
560         if (st) {
561             av_free(st->priv_data);
562             av_free(st->codec->extradata);
563         }
564         av_free(st);
565     }
566     return -1;
567 }
568
569 #define DO_2BITS(bits, var, defval) \
570     switch (bits & 3) \
571     { \
572     case 3: var = get_le32(pb); rsize += 4; break; \
573     case 2: var = get_le16(pb); rsize += 2; break; \
574     case 1: var = get_byte(pb); rsize++; break; \
575     default: var = defval; break; \
576     }
577
578 /**
579  *
580  * @return <0 in case of an error
581  */
582 static int asf_get_packet(AVFormatContext *s)
583 {
584     ASFContext *asf = s->priv_data;
585     ByteIOContext *pb = s->pb;
586     uint32_t packet_length, padsize;
587     int rsize = 8;
588     int c, d, e, off;
589
590     off= (url_ftell(s->pb) - s->data_offset) % asf->packet_size + 3;
591
592     c=d=e=-1;
593     while(off-- > 0){
594         c=d; d=e;
595         e= get_byte(pb);
596         if(c == 0x82 && !d && !e)
597             break;
598     }
599
600     if (c != 0x82) {
601         if (!url_feof(pb))
602             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
603     }
604     if ((c & 0x8f) == 0x82) {
605         if (d || e) {
606             if (!url_feof(pb))
607                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
608             return -1;
609         }
610         c= get_byte(pb);
611         d= get_byte(pb);
612         rsize+=3;
613     }else{
614         url_fseek(pb, -1, SEEK_CUR); //FIXME
615     }
616
617     asf->packet_flags    = c;
618     asf->packet_property = d;
619
620     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
621     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
622     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
623
624     //the following checks prevent overflows and infinite loops
625     if(packet_length >= (1U<<29)){
626         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
627         return -1;
628     }
629     if(padsize >= packet_length){
630         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
631         return -1;
632     }
633
634     asf->packet_timestamp = get_le32(pb);
635     get_le16(pb); /* duration */
636     // rsize has at least 11 bytes which have to be present
637
638     if (asf->packet_flags & 0x01) {
639         asf->packet_segsizetype = get_byte(pb); rsize++;
640         asf->packet_segments = asf->packet_segsizetype & 0x3f;
641     } else {
642         asf->packet_segments = 1;
643         asf->packet_segsizetype = 0x80;
644     }
645     asf->packet_size_left = packet_length - padsize - rsize;
646     if (packet_length < asf->hdr.min_pktsize)
647         padsize += asf->hdr.min_pktsize - packet_length;
648     asf->packet_padsize = padsize;
649 #ifdef DEBUG
650     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
651 #endif
652     return 0;
653 }
654
655 /**
656  *
657  * @return <0 if error
658  */
659 static int asf_read_frame_header(AVFormatContext *s){
660     ASFContext *asf = s->priv_data;
661     ByteIOContext *pb = s->pb;
662     int rsize = 1;
663     int num = get_byte(pb);
664     int64_t ts0, ts1;
665
666     asf->packet_segments--;
667     asf->packet_key_frame = num >> 7;
668     asf->stream_index = asf->asfid2avid[num & 0x7f];
669     // sequence should be ignored!
670     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
671     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
672     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
673 //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);
674     if (asf->packet_replic_size >= 8) {
675         asf->packet_obj_size = get_le32(pb);
676         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
677             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
678             return -1;
679         }
680         asf->packet_frag_timestamp = get_le32(pb); // timestamp
681         if(asf->packet_replic_size >= 8+38+4){
682 //            for(i=0; i<asf->packet_replic_size-8; i++)
683 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
684 //            av_log(s, AV_LOG_DEBUG, "\n");
685             url_fskip(pb, 10);
686             ts0= get_le64(pb);
687             ts1= get_le64(pb);
688             url_fskip(pb, 12);
689             get_le32(pb);
690             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
691             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
692             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
693         }else
694             url_fskip(pb, asf->packet_replic_size - 8);
695         rsize += asf->packet_replic_size; // FIXME - check validity
696     } else if (asf->packet_replic_size==1){
697         // multipacket - frag_offset is beginning timestamp
698         asf->packet_time_start = asf->packet_frag_offset;
699         asf->packet_frag_offset = 0;
700         asf->packet_frag_timestamp = asf->packet_timestamp;
701
702         asf->packet_time_delta = get_byte(pb);
703         rsize++;
704     }else if(asf->packet_replic_size!=0){
705         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
706         return -1;
707     }
708     if (asf->packet_flags & 0x01) {
709         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
710         if(asf->packet_frag_size > asf->packet_size_left - rsize){
711             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
712             return -1;
713         }
714         //printf("Fragsize %d\n", asf->packet_frag_size);
715     } else {
716         asf->packet_frag_size = asf->packet_size_left - rsize;
717         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
718     }
719     if (asf->packet_replic_size == 1) {
720         asf->packet_multi_size = asf->packet_frag_size;
721         if (asf->packet_multi_size > asf->packet_size_left)
722             return -1;
723     }
724     asf->packet_size_left -= rsize;
725     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
726
727     return 0;
728 }
729
730 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
731 {
732     ASFContext *asf = s->priv_data;
733     ASFStream *asf_st = 0;
734     ByteIOContext *pb = s->pb;
735     //static int pc = 0;
736     for (;;) {
737         if(url_feof(pb))
738             return AVERROR(EIO);
739         if (asf->packet_size_left < FRAME_HEADER_SIZE
740             || asf->packet_segments < 1) {
741             //asf->packet_size_left <= asf->packet_padsize) {
742             int ret = asf->packet_size_left + asf->packet_padsize;
743             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
744             assert(ret>=0);
745             /* fail safe */
746             url_fskip(pb, ret);
747
748             asf->packet_pos= url_ftell(s->pb);
749             if (asf->data_object_size != (uint64_t)-1 &&
750                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
751                 return AVERROR(EIO); /* Do not exceed the size of the data object */
752             ret = asf_get_packet(s);
753             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
754             if (ret < 0)
755                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
756             asf->packet_time_start = 0;
757             continue;
758         }
759         if (asf->packet_time_start == 0) {
760             if(asf_read_frame_header(s) < 0){
761                 asf->packet_segments= 0;
762                 continue;
763             }
764             if (asf->stream_index < 0
765                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
766                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
767                 ) {
768                 asf->packet_time_start = 0;
769                 /* unhandled packet (should not happen) */
770                 url_fskip(pb, asf->packet_frag_size);
771                 asf->packet_size_left -= asf->packet_frag_size;
772                 if(asf->stream_index < 0)
773                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
774                 continue;
775             }
776             asf->asf_st = s->streams[asf->stream_index]->priv_data;
777         }
778         asf_st = asf->asf_st;
779
780         if (asf->packet_replic_size == 1) {
781             // frag_offset is here used as the beginning timestamp
782             asf->packet_frag_timestamp = asf->packet_time_start;
783             asf->packet_time_start += asf->packet_time_delta;
784             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
785             asf->packet_size_left--;
786             asf->packet_multi_size--;
787             if (asf->packet_multi_size < asf->packet_obj_size)
788             {
789                 asf->packet_time_start = 0;
790                 url_fskip(pb, asf->packet_multi_size);
791                 asf->packet_size_left -= asf->packet_multi_size;
792                 continue;
793             }
794             asf->packet_multi_size -= asf->packet_obj_size;
795             //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);
796         }
797         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
798               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
799            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
800             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
801                 asf_st->frag_offset, asf->packet_frag_size,
802                 asf->packet_obj_size, asf_st->pkt.size);
803             asf->packet_obj_size= asf_st->pkt.size;
804         }
805
806         if (   asf_st->pkt.size != asf->packet_obj_size
807             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
808             if(asf_st->pkt.data){
809                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
810                 asf_st->frag_offset = 0;
811                 av_free_packet(&asf_st->pkt);
812             }
813             /* new packet */
814             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
815             asf_st->seq = asf->packet_seq;
816             asf_st->pkt.pts = asf->packet_frag_timestamp;
817             asf_st->pkt.stream_index = asf->stream_index;
818             asf_st->pkt.pos =
819             asf_st->packet_pos= asf->packet_pos;
820 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
821 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
822 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
823             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
824                 asf->packet_key_frame = 1;
825             if (asf->packet_key_frame)
826                 asf_st->pkt.flags |= PKT_FLAG_KEY;
827         }
828
829         /* read data */
830         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
831         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
832         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
833         asf->packet_size_left -= asf->packet_frag_size;
834         if (asf->packet_size_left < 0)
835             continue;
836
837         if(   asf->packet_frag_offset >= asf_st->pkt.size
838            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
839             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
840                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
841             continue;
842         }
843
844         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
845                    asf->packet_frag_size);
846         if (s->key && s->keylen == 20)
847             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
848                             asf->packet_frag_size);
849         asf_st->frag_offset += asf->packet_frag_size;
850         /* test if whole packet is read */
851         if (asf_st->frag_offset == asf_st->pkt.size) {
852             //workaround for macroshit radio DVR-MS files
853             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
854                && asf_st->pkt.size > 100){
855                 int i;
856                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
857                 if(i == asf_st->pkt.size){
858                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
859                     asf_st->frag_offset = 0;
860                     av_free_packet(&asf_st->pkt);
861                     continue;
862                 }
863             }
864
865             /* return packet */
866             if (asf_st->ds_span > 1) {
867               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
868                     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);
869               }else{
870                 /* packet descrambling */
871                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
872                 if (newdata) {
873                     int offset = 0;
874                     while (offset < asf_st->pkt.size) {
875                         int off = offset / asf_st->ds_chunk_size;
876                         int row = off / asf_st->ds_span;
877                         int col = off % asf_st->ds_span;
878                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
879                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
880
881                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
882                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
883                         memcpy(newdata + offset,
884                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
885                                asf_st->ds_chunk_size);
886                         offset += asf_st->ds_chunk_size;
887                     }
888                     av_free(asf_st->pkt.data);
889                     asf_st->pkt.data = newdata;
890                 }
891               }
892             }
893             asf_st->frag_offset = 0;
894             *pkt= asf_st->pkt;
895             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
896             asf_st->pkt.size = 0;
897             asf_st->pkt.data = 0;
898             break; // packet completed
899         }
900     }
901     return 0;
902 }
903
904 // Added to support seeking after packets have been read
905 // If information is not reset, read_packet fails due to
906 // leftover information from previous reads
907 static void asf_reset_header(AVFormatContext *s)
908 {
909     ASFContext *asf = s->priv_data;
910     ASFStream *asf_st;
911     int i;
912
913     asf->packet_nb_frames = 0;
914     asf->packet_size_left = 0;
915     asf->packet_segments = 0;
916     asf->packet_flags = 0;
917     asf->packet_property = 0;
918     asf->packet_timestamp = 0;
919     asf->packet_segsizetype = 0;
920     asf->packet_segments = 0;
921     asf->packet_seq = 0;
922     asf->packet_replic_size = 0;
923     asf->packet_key_frame = 0;
924     asf->packet_padsize = 0;
925     asf->packet_frag_offset = 0;
926     asf->packet_frag_size = 0;
927     asf->packet_frag_timestamp = 0;
928     asf->packet_multi_size = 0;
929     asf->packet_obj_size = 0;
930     asf->packet_time_delta = 0;
931     asf->packet_time_start = 0;
932
933     for(i=0; i<s->nb_streams; i++){
934         asf_st= s->streams[i]->priv_data;
935         av_free_packet(&asf_st->pkt);
936         asf_st->frag_offset=0;
937         asf_st->seq=0;
938     }
939     asf->asf_st= NULL;
940 }
941
942 static int asf_read_close(AVFormatContext *s)
943 {
944     int i;
945
946     asf_reset_header(s);
947     for(i=0;i<s->nb_streams;i++) {
948         AVStream *st = s->streams[i];
949         av_free(st->priv_data);
950         av_free(st->codec->palctrl);
951     }
952     return 0;
953 }
954
955 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
956 {
957     ASFContext *asf = s->priv_data;
958     AVPacket pkt1, *pkt = &pkt1;
959     ASFStream *asf_st;
960     int64_t pts;
961     int64_t pos= *ppos;
962     int i;
963     int64_t start_pos[s->nb_streams];
964
965     for(i=0; i<s->nb_streams; i++){
966         start_pos[i]= pos;
967     }
968
969     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
970     *ppos= pos;
971     url_fseek(s->pb, pos, SEEK_SET);
972
973 //printf("asf_read_pts\n");
974     asf_reset_header(s);
975     for(;;){
976         if (av_read_frame(s, pkt) < 0){
977             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
978             return AV_NOPTS_VALUE;
979         }
980
981         pts= pkt->pts;
982
983         av_free_packet(pkt);
984         if(pkt->flags&PKT_FLAG_KEY){
985             i= pkt->stream_index;
986
987             asf_st= s->streams[i]->priv_data;
988
989 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
990             pos= asf_st->packet_pos;
991
992             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
993             start_pos[i]= asf_st->packet_pos + 1;
994
995             if(pkt->stream_index == stream_index)
996                break;
997         }
998     }
999
1000     *ppos= pos;
1001 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1002
1003     return pts;
1004 }
1005
1006 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1007 {
1008     GUID g;
1009     ASFContext *asf = s->priv_data;
1010     int64_t gsize, itime;
1011     int64_t pos, current_pos, index_pts;
1012     int i;
1013     int pct,ict;
1014
1015     current_pos = url_ftell(s->pb);
1016
1017     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1018     get_guid(s->pb, &g);
1019     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
1020         gsize = get_le64(s->pb);
1021         get_guid(s->pb, &g);
1022         itime=get_le64(s->pb);
1023         pct=get_le32(s->pb);
1024         ict=get_le32(s->pb);
1025         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1026
1027         for (i=0;i<ict;i++){
1028             int pktnum=get_le32(s->pb);
1029             int pktct =get_le16(s->pb);
1030             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1031
1032             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1033             index_pts=av_rescale(itime, i, 10000);
1034
1035             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1036         }
1037         asf->index_read= 1;
1038     }
1039     url_fseek(s->pb, current_pos, SEEK_SET);
1040 }
1041
1042 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1043 {
1044     ASFContext *asf = s->priv_data;
1045     AVStream *st = s->streams[stream_index];
1046     int64_t pos;
1047     int index;
1048
1049     if (asf->packet_size <= 0)
1050         return -1;
1051
1052     /* Try using the protocol's read_seek if available */
1053     if(s->pb) {
1054         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1055         if(ret >= 0)
1056             asf_reset_header(s);
1057         if (ret != AVERROR(ENOSYS))
1058             return ret;
1059     }
1060
1061     if (!asf->index_read)
1062         asf_build_simple_index(s, stream_index);
1063
1064     if(!(asf->index_read && st->index_entries)){
1065         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1066             return -1;
1067     }else{
1068         index= av_index_search_timestamp(st, pts, flags);
1069         if(index<0)
1070             return -1;
1071
1072         /* find the position */
1073         pos = st->index_entries[index].pos;
1074         pts = st->index_entries[index].timestamp;
1075
1076     // various attempts to find key frame have failed so far
1077     //    asf_reset_header(s);
1078     //    url_fseek(s->pb, pos, SEEK_SET);
1079     //    key_pos = pos;
1080     //     for(i=0;i<16;i++){
1081     //         pos = url_ftell(s->pb);
1082     //         if (av_read_frame(s, &pkt) < 0){
1083     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1084     //             return -1;
1085     //         }
1086     //         asf_st = s->streams[stream_index]->priv_data;
1087     //         pos += st->parser->frame_offset;
1088     //
1089     //         if (pkt.size > b) {
1090     //             b = pkt.size;
1091     //             key_pos = pos;
1092     //         }
1093     //
1094     //         av_free_packet(&pkt);
1095     //     }
1096
1097         /* do the seek */
1098         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1099         url_fseek(s->pb, pos, SEEK_SET);
1100     }
1101     asf_reset_header(s);
1102     return 0;
1103 }
1104
1105 AVInputFormat asf_demuxer = {
1106     "asf",
1107     "asf format",
1108     sizeof(ASFContext),
1109     asf_probe,
1110     asf_read_header,
1111     asf_read_packet,
1112     asf_read_close,
1113     asf_read_seek,
1114     asf_read_pts,
1115 };