Add a special guidcmp function to compare ASF guids, to avoid the many
[ffmpeg.git] / libavformat / asfdec.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 (!guidcmp(g, &cmp)) \
52     dprintf(NULL, "(GUID: %s) ", #cmp)
53
54 static void print_guid(const GUID *g)
55 {
56     int i;
57     PRINT_IF_GUID(g, ff_asf_header);
58     else PRINT_IF_GUID(g, ff_asf_file_header);
59     else PRINT_IF_GUID(g, ff_asf_stream_header);
60     else PRINT_IF_GUID(g, ff_asf_audio_stream);
61     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
62     else PRINT_IF_GUID(g, ff_asf_video_stream);
63     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
64     else PRINT_IF_GUID(g, ff_asf_command_stream);
65     else PRINT_IF_GUID(g, ff_asf_comment_header);
66     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
67     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
68     else PRINT_IF_GUID(g, ff_asf_data_header);
69     else PRINT_IF_GUID(g, index_guid);
70     else PRINT_IF_GUID(g, ff_asf_head1_guid);
71     else PRINT_IF_GUID(g, ff_asf_head2_guid);
72     else PRINT_IF_GUID(g, ff_asf_my_guid);
73     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
74     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
75     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
76     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
77     else PRINT_IF_GUID(g, ff_asf_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 int guidcmp(const void *g1, const void *g2)
91 {
92     return memcmp(g1, g2, sizeof(GUID));
93 }
94
95 static void get_guid(ByteIOContext *s, GUID *g)
96 {
97     assert(sizeof(*g) == 16);
98     get_buffer(s, *g, sizeof(*g));
99 }
100
101 #if 0
102 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
103 {
104     int len, c;
105     char *q;
106
107     len = get_le16(pb);
108     q = buf;
109     while (len > 0) {
110         c = get_le16(pb);
111         if ((q - buf) < buf_size - 1)
112             *q++ = c;
113         len--;
114     }
115     *q = '\0';
116 }
117 #endif
118
119 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
120 {
121     char* q = buf;
122     len /= 2;
123     while (len--) {
124         uint8_t tmp;
125         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
126     }
127     *q = '\0';
128 }
129
130 static int asf_probe(AVProbeData *pd)
131 {
132     /* check file header */
133     if (!guidcmp(pd->buf, &ff_asf_header))
134         return AVPROBE_SCORE_MAX;
135     else
136         return 0;
137 }
138
139 static int get_value(ByteIOContext *pb, int type){
140     switch(type){
141         case 2: return get_le32(pb);
142         case 3: return get_le32(pb);
143         case 4: return get_le64(pb);
144         case 5: return get_le16(pb);
145         default:return INT_MIN;
146     }
147 }
148
149 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
150 {
151     char value[1024];
152     if (type <= 1) {         // unicode or byte
153         get_str16_nolen(s->pb, len, value, sizeof(value));
154     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
155         uint64_t num = get_value(s->pb, type);
156         snprintf(value, sizeof(value), "%"PRIu64, num);
157     } else {
158         url_fskip(s->pb, len);
159         return;
160     }
161     if (strncmp(key, "WM/", 3))
162         key += 3;
163     av_metadata_set(&s->metadata, key, value);
164 }
165
166 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
167 {
168     ASFContext *asf = s->priv_data;
169     GUID g;
170     ByteIOContext *pb = s->pb;
171     AVStream *st;
172     ASFStream *asf_st;
173     int size, i;
174     int64_t gsize;
175     AVRational dar[128];
176     uint32_t bitrate[128];
177
178     memset(dar, 0, sizeof(dar));
179     memset(bitrate, 0, sizeof(bitrate));
180
181     get_guid(pb, &g);
182     if (guidcmp(&g, &ff_asf_header))
183         return -1;
184     get_le64(pb);
185     get_le32(pb);
186     get_byte(pb);
187     get_byte(pb);
188     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
189     for(;;) {
190         get_guid(pb, &g);
191         gsize = get_le64(pb);
192         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
193         print_guid(&g);
194         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
195         if (!guidcmp(&g, &ff_asf_data_header)) {
196             asf->data_object_offset = url_ftell(pb);
197             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
198             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
199                 asf->data_object_size = gsize - 24;
200             } else {
201                 asf->data_object_size = (uint64_t)-1;
202             }
203             break;
204         }
205         if (gsize < 24)
206             return -1;
207         if (!guidcmp(&g, &ff_asf_file_header)) {
208             get_guid(pb, &asf->hdr.guid);
209             asf->hdr.file_size          = get_le64(pb);
210             asf->hdr.create_time        = get_le64(pb);
211             asf->nb_packets             = get_le64(pb);
212             asf->hdr.play_time          = get_le64(pb);
213             asf->hdr.send_time          = get_le64(pb);
214             asf->hdr.preroll            = get_le32(pb);
215             asf->hdr.ignore             = get_le32(pb);
216             asf->hdr.flags              = get_le32(pb);
217             asf->hdr.min_pktsize        = get_le32(pb);
218             asf->hdr.max_pktsize        = get_le32(pb);
219             asf->hdr.max_bitrate        = get_le32(pb);
220             asf->packet_size = asf->hdr.max_pktsize;
221         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
222             enum CodecType type;
223             int type_specific_size, sizeX;
224             uint64_t total_size;
225             unsigned int tag1;
226             int64_t pos1, pos2, start_time;
227             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
228
229             pos1 = url_ftell(pb);
230
231             st = av_new_stream(s, 0);
232             if (!st)
233                 return AVERROR(ENOMEM);
234             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
235             asf_st = av_mallocz(sizeof(ASFStream));
236             if (!asf_st)
237                 return AVERROR(ENOMEM);
238             st->priv_data = asf_st;
239             start_time = asf->hdr.preroll;
240
241             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
242                 st->duration = asf->hdr.send_time /
243                     (10000000 / 1000) - start_time;
244             }
245             get_guid(pb, &g);
246
247             test_for_ext_stream_audio = 0;
248             if (!guidcmp(&g, &ff_asf_audio_stream)) {
249                 type = CODEC_TYPE_AUDIO;
250             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
251                 type = CODEC_TYPE_VIDEO;
252             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
253                 type = CODEC_TYPE_DATA;
254             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
255                 test_for_ext_stream_audio = 1;
256                 type = CODEC_TYPE_UNKNOWN;
257             } else {
258                 return -1;
259             }
260             get_guid(pb, &g);
261             total_size = get_le64(pb);
262             type_specific_size = get_le32(pb);
263             get_le32(pb);
264             st->id = get_le16(pb) & 0x7f; /* stream id */
265             // mapping of asf ID to AV stream ID;
266             asf->asfid2avid[st->id] = s->nb_streams - 1;
267
268             get_le32(pb);
269
270             if (test_for_ext_stream_audio) {
271                 get_guid(pb, &g);
272                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
273                     type = CODEC_TYPE_AUDIO;
274                     is_dvr_ms_audio=1;
275                     get_guid(pb, &g);
276                     get_le32(pb);
277                     get_le32(pb);
278                     get_le32(pb);
279                     get_guid(pb, &g);
280                     get_le32(pb);
281                 }
282             }
283
284             st->codec->codec_type = type;
285             if (type == CODEC_TYPE_AUDIO) {
286                 get_wav_header(pb, st->codec, type_specific_size);
287                 if (is_dvr_ms_audio) {
288                     // codec_id and codec_tag are unreliable in dvr_ms
289                     // files. Set them later by probing stream.
290                     st->codec->codec_id = CODEC_ID_PROBE;
291                     st->codec->codec_tag = 0;
292                 }
293                 if (st->codec->codec_id == CODEC_ID_AAC) {
294                     st->need_parsing = AVSTREAM_PARSE_NONE;
295                 } else {
296                     st->need_parsing = AVSTREAM_PARSE_FULL;
297                 }
298                 /* We have to init the frame size at some point .... */
299                 pos2 = url_ftell(pb);
300                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
301                     asf_st->ds_span = get_byte(pb);
302                     asf_st->ds_packet_size = get_le16(pb);
303                     asf_st->ds_chunk_size = get_le16(pb);
304                     get_le16(pb); //ds_data_size
305                     get_byte(pb); //ds_silence_data
306                 }
307                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
308                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
309                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
310                 if (asf_st->ds_span > 1) {
311                     if (!asf_st->ds_chunk_size
312                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
313                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
314                         asf_st->ds_span = 0; // disable descrambling
315                 }
316                 switch (st->codec->codec_id) {
317                 case CODEC_ID_MP3:
318                     st->codec->frame_size = MPA_FRAME_SIZE;
319                     break;
320                 case CODEC_ID_PCM_S16LE:
321                 case CODEC_ID_PCM_S16BE:
322                 case CODEC_ID_PCM_U16LE:
323                 case CODEC_ID_PCM_U16BE:
324                 case CODEC_ID_PCM_S8:
325                 case CODEC_ID_PCM_U8:
326                 case CODEC_ID_PCM_ALAW:
327                 case CODEC_ID_PCM_MULAW:
328                     st->codec->frame_size = 1;
329                     break;
330                 default:
331                     /* This is probably wrong, but it prevents a crash later */
332                     st->codec->frame_size = 1;
333                     break;
334                 }
335             } else if (type == CODEC_TYPE_VIDEO) {
336                 get_le32(pb);
337                 get_le32(pb);
338                 get_byte(pb);
339                 size = get_le16(pb); /* size */
340                 sizeX= get_le32(pb); /* size */
341                 st->codec->width = get_le32(pb);
342                 st->codec->height = get_le32(pb);
343                 /* not available for asf */
344                 get_le16(pb); /* panes */
345                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
346                 tag1 = get_le32(pb);
347                 url_fskip(pb, 20);
348 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
349                 size= sizeX;
350                 if (size > 40) {
351                     st->codec->extradata_size = size - 40;
352                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
353                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
354                 }
355
356                 /* Extract palette from extradata if bpp <= 8 */
357                 /* This code assumes that extradata contains only palette */
358                 /* This is true for all paletted codecs implemented in ffmpeg */
359                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
360                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
361 #ifdef WORDS_BIGENDIAN
362                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
363                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
364 #else
365                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
366                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
367 #endif
368                     st->codec->palctrl->palette_changed = 1;
369                 }
370
371                 st->codec->codec_tag = tag1;
372                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
373                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
374                     st->need_parsing = AVSTREAM_PARSE_FULL;
375             }
376             pos2 = url_ftell(pb);
377             url_fskip(pb, gsize - (pos2 - pos1 + 24));
378         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
379             int len1, len2, len3, len4, len5;
380
381             len1 = get_le16(pb);
382             len2 = get_le16(pb);
383             len3 = get_le16(pb);
384             len4 = get_le16(pb);
385             len5 = get_le16(pb);
386             get_tag(s, "title"    , 0, len1);
387             get_tag(s, "author"   , 0, len2);
388             get_tag(s, "copyright", 0, len3);
389             get_tag(s, "comment"  , 0, len4);
390             url_fskip(pb, len5);
391         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
392             int stream_count = get_le16(pb);
393             int j;
394
395 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
396 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
397             for(j = 0; j < stream_count; j++) {
398                 int flags, bitrate, stream_id;
399
400                 flags= get_le16(pb);
401                 bitrate= get_le32(pb);
402                 stream_id= (flags & 0x7f);
403 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
404                 asf->stream_bitrates[stream_id]= bitrate;
405             }
406         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
407             int desc_count, i;
408
409             desc_count = get_le16(pb);
410             for(i=0;i<desc_count;i++) {
411                     int name_len,value_type,value_len;
412                     char name[1024];
413
414                     name_len = get_le16(pb);
415                     get_str16_nolen(pb, name_len, name, sizeof(name));
416                     value_type = get_le16(pb);
417                     value_len  = get_le16(pb);
418                     get_tag(s, name, value_type, value_len);
419             }
420         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
421             int n, stream_num, name_len, value_len, value_type, value_num;
422             n = get_le16(pb);
423
424             for(i=0;i<n;i++) {
425                 char name[1024];
426
427                 get_le16(pb); //lang_list_index
428                 stream_num= get_le16(pb);
429                 name_len=   get_le16(pb);
430                 value_type= get_le16(pb);
431                 value_len=  get_le32(pb);
432
433                 get_str16_nolen(pb, name_len, name, sizeof(name));
434 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
435                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
436                 url_fskip(pb, value_len - 2);
437
438                 if(stream_num<128){
439                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
440                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
441                 }
442             }
443         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
444             int ext_len, payload_ext_ct, stream_ct;
445             uint32_t ext_d, leak_rate, stream_num;
446             int64_t pos_ex_st;
447             pos_ex_st = url_ftell(pb);
448
449             get_le64(pb); // starttime
450             get_le64(pb); // endtime
451             leak_rate = get_le32(pb); // leak-datarate
452             get_le32(pb); // bucket-datasize
453             get_le32(pb); // init-bucket-fullness
454             get_le32(pb); // alt-leak-datarate
455             get_le32(pb); // alt-bucket-datasize
456             get_le32(pb); // alt-init-bucket-fullness
457             get_le32(pb); // max-object-size
458             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
459             stream_num = get_le16(pb); // stream-num
460             get_le16(pb); // stream-language-id-index
461             get_le64(pb); // avg frametime in 100ns units
462             stream_ct = get_le16(pb); //stream-name-count
463             payload_ext_ct = get_le16(pb); //payload-extension-system-count
464
465             if (stream_num < 128)
466                 bitrate[stream_num] = leak_rate;
467
468             for (i=0; i<stream_ct; i++){
469                 get_le16(pb);
470                 ext_len = get_le16(pb);
471                 url_fseek(pb, ext_len, SEEK_CUR);
472             }
473
474             for (i=0; i<payload_ext_ct; i++){
475                 get_guid(pb, &g);
476                 ext_d=get_le16(pb);
477                 ext_len=get_le32(pb);
478                 url_fseek(pb, ext_len, SEEK_CUR);
479             }
480
481             // there could be a optional stream properties object to follow
482             // if so the next iteration will pick it up
483         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
484             int v1, v2;
485             get_guid(pb, &g);
486             v1 = get_le32(pb);
487             v2 = get_le16(pb);
488 #if 0
489         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
490             int len, v1, n, num;
491             char str[256], *q;
492             char tag[16];
493
494             get_guid(pb, &g);
495             print_guid(&g);
496
497             n = get_le32(pb);
498             for(i=0;i<n;i++) {
499                 num = get_le16(pb); /* stream number */
500                 get_str16(pb, str, sizeof(str));
501                 get_str16(pb, str, sizeof(str));
502                 len = get_le16(pb);
503                 q = tag;
504                 while (len > 0) {
505                     v1 = get_byte(pb);
506                     if ((q - tag) < sizeof(tag) - 1)
507                         *q++ = v1;
508                     len--;
509                 }
510                 *q = '\0';
511             }
512 #endif
513         } else if (url_feof(pb)) {
514             return -1;
515         } else {
516             url_fseek(pb, gsize - 24, SEEK_CUR);
517         }
518     }
519     get_guid(pb, &g);
520     get_le64(pb);
521     get_byte(pb);
522     get_byte(pb);
523     if (url_feof(pb))
524         return -1;
525     asf->data_offset = url_ftell(pb);
526     asf->packet_size_left = 0;
527
528
529     for(i=0; i<128; i++){
530         int stream_num= asf->asfid2avid[i];
531         if(stream_num>=0){
532             AVStream *st = s->streams[stream_num];
533             if (!st->codec->bit_rate)
534                 st->codec->bit_rate = bitrate[i];
535             if (dar[i].num > 0 && dar[i].den > 0)
536                 av_reduce(&st->sample_aspect_ratio.num,
537                           &st->sample_aspect_ratio.den,
538                           dar[i].num, dar[i].den, INT_MAX);
539 //av_log(s, 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);
540         }
541     }
542
543     return 0;
544 }
545
546 #define DO_2BITS(bits, var, defval) \
547     switch (bits & 3) \
548     { \
549     case 3: var = get_le32(pb); rsize += 4; break; \
550     case 2: var = get_le16(pb); rsize += 2; break; \
551     case 1: var = get_byte(pb); rsize++; break; \
552     default: var = defval; break; \
553     }
554
555 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
556 {
557     ASFContext *asf = s->priv_data;
558     uint32_t packet_length, padsize;
559     int rsize = 8;
560     int c, d, e, off;
561
562     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
563
564     c=d=e=-1;
565     while(off-- > 0){
566         c=d; d=e;
567         e= get_byte(pb);
568         if(c == 0x82 && !d && !e)
569             break;
570     }
571
572     if (c != 0x82) {
573         if (!url_feof(pb))
574             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
575     }
576     if ((c & 0x8f) == 0x82) {
577         if (d || e) {
578             if (!url_feof(pb))
579                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
580             return -1;
581         }
582         c= get_byte(pb);
583         d= get_byte(pb);
584         rsize+=3;
585     }else{
586         url_fseek(pb, -1, SEEK_CUR); //FIXME
587     }
588
589     asf->packet_flags    = c;
590     asf->packet_property = d;
591
592     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
593     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
594     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
595
596     //the following checks prevent overflows and infinite loops
597     if(packet_length >= (1U<<29)){
598         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
599         return -1;
600     }
601     if(padsize >= packet_length){
602         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
603         return -1;
604     }
605
606     asf->packet_timestamp = get_le32(pb);
607     get_le16(pb); /* duration */
608     // rsize has at least 11 bytes which have to be present
609
610     if (asf->packet_flags & 0x01) {
611         asf->packet_segsizetype = get_byte(pb); rsize++;
612         asf->packet_segments = asf->packet_segsizetype & 0x3f;
613     } else {
614         asf->packet_segments = 1;
615         asf->packet_segsizetype = 0x80;
616     }
617     asf->packet_size_left = packet_length - padsize - rsize;
618     if (packet_length < asf->hdr.min_pktsize)
619         padsize += asf->hdr.min_pktsize - packet_length;
620     asf->packet_padsize = padsize;
621     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
622     return 0;
623 }
624
625 /**
626  *
627  * @return <0 if error
628  */
629 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
630     ASFContext *asf = s->priv_data;
631     int rsize = 1;
632     int num = get_byte(pb);
633     int64_t ts0, ts1;
634
635     asf->packet_segments--;
636     asf->packet_key_frame = num >> 7;
637     asf->stream_index = asf->asfid2avid[num & 0x7f];
638     // sequence should be ignored!
639     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
640     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
641     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
642 //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);
643     if (asf->packet_replic_size >= 8) {
644         asf->packet_obj_size = get_le32(pb);
645         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
646             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
647             return -1;
648         }
649         asf->packet_frag_timestamp = get_le32(pb); // timestamp
650         if(asf->packet_replic_size >= 8+38+4){
651 //            for(i=0; i<asf->packet_replic_size-8; i++)
652 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
653 //            av_log(s, AV_LOG_DEBUG, "\n");
654             url_fskip(pb, 10);
655             ts0= get_le64(pb);
656             ts1= get_le64(pb);
657             url_fskip(pb, 12);
658             get_le32(pb);
659             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
660             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
661             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
662         }else
663             url_fskip(pb, asf->packet_replic_size - 8);
664         rsize += asf->packet_replic_size; // FIXME - check validity
665     } else if (asf->packet_replic_size==1){
666         // multipacket - frag_offset is beginning timestamp
667         asf->packet_time_start = asf->packet_frag_offset;
668         asf->packet_frag_offset = 0;
669         asf->packet_frag_timestamp = asf->packet_timestamp;
670
671         asf->packet_time_delta = get_byte(pb);
672         rsize++;
673     }else if(asf->packet_replic_size!=0){
674         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
675         return -1;
676     }
677     if (asf->packet_flags & 0x01) {
678         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
679         if(asf->packet_frag_size > asf->packet_size_left - rsize){
680             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
681             return -1;
682         }
683         //printf("Fragsize %d\n", asf->packet_frag_size);
684     } else {
685         asf->packet_frag_size = asf->packet_size_left - rsize;
686         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
687     }
688     if (asf->packet_replic_size == 1) {
689         asf->packet_multi_size = asf->packet_frag_size;
690         if (asf->packet_multi_size > asf->packet_size_left)
691             return -1;
692     }
693     asf->packet_size_left -= rsize;
694     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
695
696     return 0;
697 }
698
699 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
700 {
701     ASFContext *asf = s->priv_data;
702     ASFStream *asf_st = 0;
703     for (;;) {
704         if(url_feof(pb))
705             return AVERROR(EIO);
706         if (asf->packet_size_left < FRAME_HEADER_SIZE
707             || asf->packet_segments < 1) {
708             //asf->packet_size_left <= asf->packet_padsize) {
709             int ret = asf->packet_size_left + asf->packet_padsize;
710             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
711             assert(ret>=0);
712             /* fail safe */
713             url_fskip(pb, ret);
714
715             asf->packet_pos= url_ftell(pb);
716             if (asf->data_object_size != (uint64_t)-1 &&
717                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
718                 return AVERROR(EIO); /* Do not exceed the size of the data object */
719             return 1;
720         }
721         if (asf->packet_time_start == 0) {
722             if(asf_read_frame_header(s, pb) < 0){
723                 asf->packet_segments= 0;
724                 continue;
725             }
726             if (asf->stream_index < 0
727                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
728                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
729                 ) {
730                 asf->packet_time_start = 0;
731                 /* unhandled packet (should not happen) */
732                 url_fskip(pb, asf->packet_frag_size);
733                 asf->packet_size_left -= asf->packet_frag_size;
734                 if(asf->stream_index < 0)
735                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
736                 continue;
737             }
738             asf->asf_st = s->streams[asf->stream_index]->priv_data;
739         }
740         asf_st = asf->asf_st;
741
742         if (asf->packet_replic_size == 1) {
743             // frag_offset is here used as the beginning timestamp
744             asf->packet_frag_timestamp = asf->packet_time_start;
745             asf->packet_time_start += asf->packet_time_delta;
746             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
747             asf->packet_size_left--;
748             asf->packet_multi_size--;
749             if (asf->packet_multi_size < asf->packet_obj_size)
750             {
751                 asf->packet_time_start = 0;
752                 url_fskip(pb, asf->packet_multi_size);
753                 asf->packet_size_left -= asf->packet_multi_size;
754                 continue;
755             }
756             asf->packet_multi_size -= asf->packet_obj_size;
757             //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);
758         }
759         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
760               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
761            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
762             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
763                 asf_st->frag_offset, asf->packet_frag_size,
764                 asf->packet_obj_size, asf_st->pkt.size);
765             asf->packet_obj_size= asf_st->pkt.size;
766         }
767
768         if (   asf_st->pkt.size != asf->packet_obj_size
769             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
770             if(asf_st->pkt.data){
771                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
772                 asf_st->frag_offset = 0;
773                 av_free_packet(&asf_st->pkt);
774             }
775             /* new packet */
776             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
777             asf_st->seq = asf->packet_seq;
778             asf_st->pkt.dts = asf->packet_frag_timestamp;
779             asf_st->pkt.stream_index = asf->stream_index;
780             asf_st->pkt.pos =
781             asf_st->packet_pos= asf->packet_pos;
782 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
783 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
784 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
785             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
786                 asf->packet_key_frame = 1;
787             if (asf->packet_key_frame)
788                 asf_st->pkt.flags |= PKT_FLAG_KEY;
789         }
790
791         /* read data */
792         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
793         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
794         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
795         asf->packet_size_left -= asf->packet_frag_size;
796         if (asf->packet_size_left < 0)
797             continue;
798
799         if(   asf->packet_frag_offset >= asf_st->pkt.size
800            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
801             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
802                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
803             continue;
804         }
805
806         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
807                    asf->packet_frag_size);
808         if (s->key && s->keylen == 20)
809             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
810                             asf->packet_frag_size);
811         asf_st->frag_offset += asf->packet_frag_size;
812         /* test if whole packet is read */
813         if (asf_st->frag_offset == asf_st->pkt.size) {
814             //workaround for macroshit radio DVR-MS files
815             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
816                && asf_st->pkt.size > 100){
817                 int i;
818                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
819                 if(i == asf_st->pkt.size){
820                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
821                     asf_st->frag_offset = 0;
822                     av_free_packet(&asf_st->pkt);
823                     continue;
824                 }
825             }
826
827             /* return packet */
828             if (asf_st->ds_span > 1) {
829               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
830                     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);
831               }else{
832                 /* packet descrambling */
833                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
834                 if (newdata) {
835                     int offset = 0;
836                     while (offset < asf_st->pkt.size) {
837                         int off = offset / asf_st->ds_chunk_size;
838                         int row = off / asf_st->ds_span;
839                         int col = off % asf_st->ds_span;
840                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
841                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
842
843                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
844                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
845                         memcpy(newdata + offset,
846                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
847                                asf_st->ds_chunk_size);
848                         offset += asf_st->ds_chunk_size;
849                     }
850                     av_free(asf_st->pkt.data);
851                     asf_st->pkt.data = newdata;
852                 }
853               }
854             }
855             asf_st->frag_offset = 0;
856             *pkt= asf_st->pkt;
857             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
858             asf_st->pkt.size = 0;
859             asf_st->pkt.data = 0;
860             break; // packet completed
861         }
862     }
863     return 0;
864 }
865
866 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
867 {
868     ASFContext *asf = s->priv_data;
869
870     for (;;) {
871         int ret;
872
873         /* parse cached packets, if any */
874         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
875             return ret;
876         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
877             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
878         asf->packet_time_start = 0;
879     }
880
881     return 0;
882 }
883
884 // Added to support seeking after packets have been read
885 // If information is not reset, read_packet fails due to
886 // leftover information from previous reads
887 static void asf_reset_header(AVFormatContext *s)
888 {
889     ASFContext *asf = s->priv_data;
890     ASFStream *asf_st;
891     int i;
892
893     asf->packet_nb_frames = 0;
894     asf->packet_size_left = 0;
895     asf->packet_segments = 0;
896     asf->packet_flags = 0;
897     asf->packet_property = 0;
898     asf->packet_timestamp = 0;
899     asf->packet_segsizetype = 0;
900     asf->packet_segments = 0;
901     asf->packet_seq = 0;
902     asf->packet_replic_size = 0;
903     asf->packet_key_frame = 0;
904     asf->packet_padsize = 0;
905     asf->packet_frag_offset = 0;
906     asf->packet_frag_size = 0;
907     asf->packet_frag_timestamp = 0;
908     asf->packet_multi_size = 0;
909     asf->packet_obj_size = 0;
910     asf->packet_time_delta = 0;
911     asf->packet_time_start = 0;
912
913     for(i=0; i<s->nb_streams; i++){
914         asf_st= s->streams[i]->priv_data;
915         av_free_packet(&asf_st->pkt);
916         asf_st->frag_offset=0;
917         asf_st->seq=0;
918     }
919     asf->asf_st= NULL;
920 }
921
922 static int asf_read_close(AVFormatContext *s)
923 {
924     int i;
925
926     asf_reset_header(s);
927     for(i=0;i<s->nb_streams;i++) {
928         AVStream *st = s->streams[i];
929         av_free(st->codec->palctrl);
930     }
931     return 0;
932 }
933
934 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
935 {
936     ASFContext *asf = s->priv_data;
937     AVPacket pkt1, *pkt = &pkt1;
938     ASFStream *asf_st;
939     int64_t pts;
940     int64_t pos= *ppos;
941     int i;
942     int64_t start_pos[s->nb_streams];
943
944     for(i=0; i<s->nb_streams; i++){
945         start_pos[i]= pos;
946     }
947
948     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
949     *ppos= pos;
950     url_fseek(s->pb, pos, SEEK_SET);
951
952 //printf("asf_read_pts\n");
953     asf_reset_header(s);
954     for(;;){
955         if (av_read_frame(s, pkt) < 0){
956             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
957             return AV_NOPTS_VALUE;
958         }
959
960         pts= pkt->pts;
961
962         av_free_packet(pkt);
963         if(pkt->flags&PKT_FLAG_KEY){
964             i= pkt->stream_index;
965
966             asf_st= s->streams[i]->priv_data;
967
968 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
969             pos= asf_st->packet_pos;
970
971             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
972             start_pos[i]= asf_st->packet_pos + 1;
973
974             if(pkt->stream_index == stream_index)
975                break;
976         }
977     }
978
979     *ppos= pos;
980 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
981
982     return pts;
983 }
984
985 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
986 {
987     GUID g;
988     ASFContext *asf = s->priv_data;
989     int64_t gsize, itime;
990     int64_t pos, current_pos, index_pts;
991     int i;
992     int pct,ict;
993
994     current_pos = url_ftell(s->pb);
995
996     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
997     get_guid(s->pb, &g);
998     if (!guidcmp(&g, &index_guid)) {
999         gsize = get_le64(s->pb);
1000         get_guid(s->pb, &g);
1001         itime=get_le64(s->pb);
1002         pct=get_le32(s->pb);
1003         ict=get_le32(s->pb);
1004         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1005
1006         for (i=0;i<ict;i++){
1007             int pktnum=get_le32(s->pb);
1008             int pktct =get_le16(s->pb);
1009             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1010
1011             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1012             index_pts=av_rescale(itime, i, 10000);
1013
1014             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1015         }
1016         asf->index_read= 1;
1017     }
1018     url_fseek(s->pb, current_pos, SEEK_SET);
1019 }
1020
1021 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1022 {
1023     ASFContext *asf = s->priv_data;
1024     AVStream *st = s->streams[stream_index];
1025     int64_t pos;
1026     int index;
1027
1028     if (asf->packet_size <= 0)
1029         return -1;
1030
1031     /* Try using the protocol's read_seek if available */
1032     if(s->pb) {
1033         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1034         if(ret >= 0)
1035             asf_reset_header(s);
1036         if (ret != AVERROR(ENOSYS))
1037             return ret;
1038     }
1039
1040     if (!asf->index_read)
1041         asf_build_simple_index(s, stream_index);
1042
1043     if(!(asf->index_read && st->index_entries)){
1044         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1045             return -1;
1046     }else{
1047         index= av_index_search_timestamp(st, pts, flags);
1048         if(index<0)
1049             return -1;
1050
1051         /* find the position */
1052         pos = st->index_entries[index].pos;
1053         pts = st->index_entries[index].timestamp;
1054
1055     // various attempts to find key frame have failed so far
1056     //    asf_reset_header(s);
1057     //    url_fseek(s->pb, pos, SEEK_SET);
1058     //    key_pos = pos;
1059     //     for(i=0;i<16;i++){
1060     //         pos = url_ftell(s->pb);
1061     //         if (av_read_frame(s, &pkt) < 0){
1062     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1063     //             return -1;
1064     //         }
1065     //         asf_st = s->streams[stream_index]->priv_data;
1066     //         pos += st->parser->frame_offset;
1067     //
1068     //         if (pkt.size > b) {
1069     //             b = pkt.size;
1070     //             key_pos = pos;
1071     //         }
1072     //
1073     //         av_free_packet(&pkt);
1074     //     }
1075
1076         /* do the seek */
1077         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1078         url_fseek(s->pb, pos, SEEK_SET);
1079     }
1080     asf_reset_header(s);
1081     return 0;
1082 }
1083
1084 AVInputFormat asf_demuxer = {
1085     "asf",
1086     NULL_IF_CONFIG_SMALL("ASF format"),
1087     sizeof(ASFContext),
1088     asf_probe,
1089     asf_read_header,
1090     asf_read_packet,
1091     asf_read_close,
1092     asf_read_seek,
1093     asf_read_pts,
1094     .metadata_conv = ff_asf_metadata_conv,
1095 };