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