use new metadata API in asf demuxer
[ffmpeg.git] / libavformat / asf.c
1 /*
2  * ASF compatible demuxer
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 #include "libavutil/common.h"
23 #include "libavcodec/mpegaudio.h"
24 #include "avformat.h"
25 #include "riff.h"
26 #include "asf.h"
27 #include "asfcrypt.h"
28
29 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
30
31 #undef NDEBUG
32 #include <assert.h>
33
34 #define FRAME_HEADER_SIZE 17
35 // Fix Me! FRAME_HEADER_SIZE may be different.
36
37 static const GUID index_guid = {
38     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
39 };
40
41 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
42     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
43 };
44 /**********************************/
45 /* decoding */
46
47 //#define DEBUG
48
49 #ifdef DEBUG
50 #define PRINT_IF_GUID(g,cmp) \
51 if (!memcmp(g, &cmp, sizeof(GUID))) \
52     dprintf(NULL, "(GUID: %s) ", #cmp)
53
54 static void print_guid(const GUID *g)
55 {
56     int i;
57     PRINT_IF_GUID(g, asf_header);
58     else PRINT_IF_GUID(g, file_header);
59     else PRINT_IF_GUID(g, stream_header);
60     else PRINT_IF_GUID(g, audio_stream);
61     else PRINT_IF_GUID(g, audio_conceal_none);
62     else PRINT_IF_GUID(g, video_stream);
63     else PRINT_IF_GUID(g, video_conceal_none);
64     else PRINT_IF_GUID(g, command_stream);
65     else PRINT_IF_GUID(g, comment_header);
66     else PRINT_IF_GUID(g, codec_comment_header);
67     else PRINT_IF_GUID(g, codec_comment1_header);
68     else PRINT_IF_GUID(g, data_header);
69     else PRINT_IF_GUID(g, index_guid);
70     else PRINT_IF_GUID(g, head1_guid);
71     else PRINT_IF_GUID(g, head2_guid);
72     else PRINT_IF_GUID(g, my_guid);
73     else PRINT_IF_GUID(g, ext_stream_header);
74     else PRINT_IF_GUID(g, extended_content_header);
75     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
76     else PRINT_IF_GUID(g, ext_stream_audio_stream);
77     else PRINT_IF_GUID(g, metadata_header);
78     else PRINT_IF_GUID(g, stream_bitrate_guid);
79     else
80         dprintf(NULL, "(GUID: unknown) ");
81     for(i=0;i<16;i++)
82         dprintf(NULL, " 0x%02x,", (*g)[i]);
83     dprintf(NULL, "}\n");
84 }
85 #undef PRINT_IF_GUID
86 #else
87 #define print_guid(g)
88 #endif
89
90 static void get_guid(ByteIOContext *s, GUID *g)
91 {
92     assert(sizeof(*g) == 16);
93     get_buffer(s, *g, sizeof(*g));
94 }
95
96 #if 0
97 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
98 {
99     int len, c;
100     char *q;
101
102     len = get_le16(pb);
103     q = buf;
104     while (len > 0) {
105         c = get_le16(pb);
106         if ((q - buf) < buf_size - 1)
107             *q++ = c;
108         len--;
109     }
110     *q = '\0';
111 }
112 #endif
113
114 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
115 {
116     char* q = buf;
117     len /= 2;
118     while (len--) {
119         uint8_t tmp;
120         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
121     }
122     *q = '\0';
123 }
124
125 static int asf_probe(AVProbeData *pd)
126 {
127     /* check file header */
128     if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
129         return AVPROBE_SCORE_MAX;
130     else
131         return 0;
132 }
133
134 static int get_value(ByteIOContext *pb, int type){
135     switch(type){
136         case 2: return get_le32(pb);
137         case 3: return get_le32(pb);
138         case 4: return get_le64(pb);
139         case 5: return get_le16(pb);
140         default:return INT_MIN;
141     }
142 }
143
144 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
145 {
146     char value[1024];
147     if (type <= 1) {         // unicode or byte
148         get_str16_nolen(s->pb, len, value, sizeof(value));
149     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
150         uint64_t num = get_value(s->pb, type);
151         snprintf(value, sizeof(value), "%"PRIu64, num);
152     } else {
153         url_fskip(s->pb, len);
154         return;
155     }
156     if (strncmp(key, "WM/", 3))
157         key += 3;
158     av_metadata_set(&s->metadata, key, value);
159 }
160
161 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
162 {
163     ASFContext *asf = s->priv_data;
164     GUID g;
165     ByteIOContext *pb = s->pb;
166     AVStream *st;
167     ASFStream *asf_st;
168     int size, i;
169     int64_t gsize;
170     AVRational dar[128];
171     uint32_t bitrate[128];
172
173     memset(dar, 0, sizeof(dar));
174     memset(bitrate, 0, sizeof(bitrate));
175
176     get_guid(pb, &g);
177     if (memcmp(&g, &asf_header, sizeof(GUID)))
178         return -1;
179     get_le64(pb);
180     get_le32(pb);
181     get_byte(pb);
182     get_byte(pb);
183     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
184     for(;;) {
185         get_guid(pb, &g);
186         gsize = get_le64(pb);
187         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
188         print_guid(&g);
189         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
190         if (!memcmp(&g, &data_header, sizeof(GUID))) {
191             asf->data_object_offset = url_ftell(pb);
192             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
193             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
194                 asf->data_object_size = gsize - 24;
195             } else {
196                 asf->data_object_size = (uint64_t)-1;
197             }
198             break;
199         }
200         if (gsize < 24)
201             return -1;
202         if (!memcmp(&g, &file_header, sizeof(GUID))) {
203             get_guid(pb, &asf->hdr.guid);
204             asf->hdr.file_size          = get_le64(pb);
205             asf->hdr.create_time        = get_le64(pb);
206             asf->nb_packets             = get_le64(pb);
207             asf->hdr.play_time          = get_le64(pb);
208             asf->hdr.send_time          = get_le64(pb);
209             asf->hdr.preroll            = get_le32(pb);
210             asf->hdr.ignore             = get_le32(pb);
211             asf->hdr.flags              = get_le32(pb);
212             asf->hdr.min_pktsize        = get_le32(pb);
213             asf->hdr.max_pktsize        = get_le32(pb);
214             asf->hdr.max_bitrate        = get_le32(pb);
215             asf->packet_size = asf->hdr.max_pktsize;
216         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
217             enum CodecType type;
218             int type_specific_size, sizeX;
219             uint64_t total_size;
220             unsigned int tag1;
221             int64_t pos1, pos2, start_time;
222             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
223
224             pos1 = url_ftell(pb);
225
226             st = av_new_stream(s, 0);
227             if (!st)
228                 return AVERROR(ENOMEM);
229             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
230             asf_st = av_mallocz(sizeof(ASFStream));
231             if (!asf_st)
232                 return AVERROR(ENOMEM);
233             st->priv_data = asf_st;
234             start_time = asf->hdr.preroll;
235
236             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
237                 st->duration = asf->hdr.send_time /
238                     (10000000 / 1000) - start_time;
239             }
240             get_guid(pb, &g);
241
242             test_for_ext_stream_audio = 0;
243             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
244                 type = CODEC_TYPE_AUDIO;
245             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
246                 type = CODEC_TYPE_VIDEO;
247             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
248                 type = CODEC_TYPE_DATA;
249             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
250                 test_for_ext_stream_audio = 1;
251                 type = CODEC_TYPE_UNKNOWN;
252             } else {
253                 return -1;
254             }
255             get_guid(pb, &g);
256             total_size = get_le64(pb);
257             type_specific_size = get_le32(pb);
258             get_le32(pb);
259             st->id = get_le16(pb) & 0x7f; /* stream id */
260             // mapping of asf ID to AV stream ID;
261             asf->asfid2avid[st->id] = s->nb_streams - 1;
262
263             get_le32(pb);
264
265             if (test_for_ext_stream_audio) {
266                 get_guid(pb, &g);
267                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
268                     type = CODEC_TYPE_AUDIO;
269                     is_dvr_ms_audio=1;
270                     get_guid(pb, &g);
271                     get_le32(pb);
272                     get_le32(pb);
273                     get_le32(pb);
274                     get_guid(pb, &g);
275                     get_le32(pb);
276                 }
277             }
278
279             st->codec->codec_type = type;
280             if (type == CODEC_TYPE_AUDIO) {
281                 get_wav_header(pb, st->codec, type_specific_size);
282                 if (is_dvr_ms_audio) {
283                     // codec_id and codec_tag are unreliable in dvr_ms
284                     // files. Set them later by probing stream.
285                     st->codec->codec_id = CODEC_ID_PROBE;
286                     st->codec->codec_tag = 0;
287                 }
288                 st->need_parsing = AVSTREAM_PARSE_FULL;
289                 /* We have to init the frame size at some point .... */
290                 pos2 = url_ftell(pb);
291                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
292                     asf_st->ds_span = get_byte(pb);
293                     asf_st->ds_packet_size = get_le16(pb);
294                     asf_st->ds_chunk_size = get_le16(pb);
295                     get_le16(pb); //ds_data_size
296                     get_byte(pb); //ds_silence_data
297                 }
298                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
299                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
300                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
301                 if (asf_st->ds_span > 1) {
302                     if (!asf_st->ds_chunk_size
303                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
304                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
305                         asf_st->ds_span = 0; // disable descrambling
306                 }
307                 switch (st->codec->codec_id) {
308                 case CODEC_ID_MP3:
309                     st->codec->frame_size = MPA_FRAME_SIZE;
310                     break;
311                 case CODEC_ID_PCM_S16LE:
312                 case CODEC_ID_PCM_S16BE:
313                 case CODEC_ID_PCM_U16LE:
314                 case CODEC_ID_PCM_U16BE:
315                 case CODEC_ID_PCM_S8:
316                 case CODEC_ID_PCM_U8:
317                 case CODEC_ID_PCM_ALAW:
318                 case CODEC_ID_PCM_MULAW:
319                     st->codec->frame_size = 1;
320                     break;
321                 default:
322                     /* This is probably wrong, but it prevents a crash later */
323                     st->codec->frame_size = 1;
324                     break;
325                 }
326             } else if (type == CODEC_TYPE_VIDEO) {
327                 get_le32(pb);
328                 get_le32(pb);
329                 get_byte(pb);
330                 size = get_le16(pb); /* size */
331                 sizeX= get_le32(pb); /* size */
332                 st->codec->width = get_le32(pb);
333                 st->codec->height = get_le32(pb);
334                 /* not available for asf */
335                 get_le16(pb); /* panes */
336                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
337                 tag1 = get_le32(pb);
338                 url_fskip(pb, 20);
339 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
340                 size= sizeX;
341                 if (size > 40) {
342                     st->codec->extradata_size = size - 40;
343                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
344                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
345                 }
346
347         /* Extract palette from extradata if bpp <= 8 */
348         /* This code assumes that extradata contains only palette */
349         /* This is true for all paletted codecs implemented in ffmpeg */
350         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
351             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
352 #ifdef WORDS_BIGENDIAN
353             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
354                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
355 #else
356             memcpy(st->codec->palctrl->palette, st->codec->extradata,
357                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
358 #endif
359             st->codec->palctrl->palette_changed = 1;
360         }
361
362                 st->codec->codec_tag = tag1;
363                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
364                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
365                     st->need_parsing = AVSTREAM_PARSE_FULL;
366             }
367             pos2 = url_ftell(pb);
368             url_fskip(pb, gsize - (pos2 - pos1 + 24));
369         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
370             int len1, len2, len3, len4, len5;
371
372             len1 = get_le16(pb);
373             len2 = get_le16(pb);
374             len3 = get_le16(pb);
375             len4 = get_le16(pb);
376             len5 = get_le16(pb);
377             get_tag(s, "title"    , 0, len1);
378             get_tag(s, "author"   , 0, len2);
379             get_tag(s, "copyright", 0, len3);
380             get_tag(s, "comment"  , 0, len4);
381             url_fskip(pb, len5);
382         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
383             int stream_count = get_le16(pb);
384             int j;
385
386 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
387 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
388             for(j = 0; j < stream_count; j++) {
389                 int flags, bitrate, stream_id;
390
391                 flags= get_le16(pb);
392                 bitrate= get_le32(pb);
393                 stream_id= (flags & 0x7f);
394 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
395                 asf->stream_bitrates[stream_id]= bitrate;
396             }
397        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
398                 int desc_count, i;
399
400                 desc_count = get_le16(pb);
401                 for(i=0;i<desc_count;i++)
402                 {
403                         int name_len,value_type,value_len;
404                         char name[1024];
405
406                         name_len = get_le16(pb);
407                         get_str16_nolen(pb, name_len, name, sizeof(name));
408                         value_type = get_le16(pb);
409                         value_len = get_le16(pb);
410                         get_tag(s, name, value_type, value_len);
411                 }
412         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
413             int n, stream_num, name_len, value_len, value_type, value_num;
414             n = get_le16(pb);
415
416             for(i=0;i<n;i++) {
417                 char name[1024];
418
419                 get_le16(pb); //lang_list_index
420                 stream_num= get_le16(pb);
421                 name_len=   get_le16(pb);
422                 value_type= get_le16(pb);
423                 value_len=  get_le32(pb);
424
425                 get_str16_nolen(pb, name_len, name, sizeof(name));
426 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
427                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
428                 url_fskip(pb, value_len - 2);
429
430                 if(stream_num<128){
431                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
432                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
433                 }
434             }
435         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
436             int ext_len, payload_ext_ct, stream_ct;
437             uint32_t ext_d, leak_rate, stream_num;
438             int64_t pos_ex_st;
439             pos_ex_st = url_ftell(pb);
440
441             get_le64(pb); // starttime
442             get_le64(pb); // endtime
443             leak_rate = get_le32(pb); // leak-datarate
444             get_le32(pb); // bucket-datasize
445             get_le32(pb); // init-bucket-fullness
446             get_le32(pb); // alt-leak-datarate
447             get_le32(pb); // alt-bucket-datasize
448             get_le32(pb); // alt-init-bucket-fullness
449             get_le32(pb); // max-object-size
450             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
451             stream_num = get_le16(pb); // stream-num
452             get_le16(pb); // stream-language-id-index
453             get_le64(pb); // avg frametime in 100ns units
454             stream_ct = get_le16(pb); //stream-name-count
455             payload_ext_ct = get_le16(pb); //payload-extension-system-count
456
457             if (stream_num < 128)
458                 bitrate[stream_num] = leak_rate;
459
460             for (i=0; i<stream_ct; i++){
461                 get_le16(pb);
462                 ext_len = get_le16(pb);
463                 url_fseek(pb, ext_len, SEEK_CUR);
464             }
465
466             for (i=0; i<payload_ext_ct; i++){
467                 get_guid(pb, &g);
468                 ext_d=get_le16(pb);
469                 ext_len=get_le32(pb);
470                 url_fseek(pb, ext_len, SEEK_CUR);
471             }
472
473             // there could be a optional stream properties object to follow
474             // if so the next iteration will pick it up
475         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
476             int v1, v2;
477             get_guid(pb, &g);
478             v1 = get_le32(pb);
479             v2 = get_le16(pb);
480 #if 0
481         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
482             int len, v1, n, num;
483             char str[256], *q;
484             char tag[16];
485
486             get_guid(pb, &g);
487             print_guid(&g);
488
489             n = get_le32(pb);
490             for(i=0;i<n;i++) {
491                 num = get_le16(pb); /* stream number */
492                 get_str16(pb, str, sizeof(str));
493                 get_str16(pb, str, sizeof(str));
494                 len = get_le16(pb);
495                 q = tag;
496                 while (len > 0) {
497                     v1 = get_byte(pb);
498                     if ((q - tag) < sizeof(tag) - 1)
499                         *q++ = v1;
500                     len--;
501                 }
502                 *q = '\0';
503             }
504 #endif
505         } else if (url_feof(pb)) {
506             return -1;
507         } else {
508             url_fseek(pb, gsize - 24, SEEK_CUR);
509         }
510     }
511     get_guid(pb, &g);
512     get_le64(pb);
513     get_byte(pb);
514     get_byte(pb);
515     if (url_feof(pb))
516         return -1;
517     asf->data_offset = url_ftell(pb);
518     asf->packet_size_left = 0;
519
520
521     for(i=0; i<128; i++){
522         int stream_num= asf->asfid2avid[i];
523         if(stream_num>=0){
524             AVStream *st = s->streams[stream_num];
525             if (!st->codec->bit_rate)
526                 st->codec->bit_rate = bitrate[i];
527             if (dar[i].num > 0 && dar[i].den > 0)
528                 av_reduce(&st->sample_aspect_ratio.num,
529                           &st->sample_aspect_ratio.den,
530                           dar[i].num, dar[i].den, INT_MAX);
531 //av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
532         }
533     }
534
535     return 0;
536 }
537
538 #define DO_2BITS(bits, var, defval) \
539     switch (bits & 3) \
540     { \
541     case 3: var = get_le32(pb); rsize += 4; break; \
542     case 2: var = get_le16(pb); rsize += 2; break; \
543     case 1: var = get_byte(pb); rsize++; break; \
544     default: var = defval; break; \
545     }
546
547 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
548 {
549     ASFContext *asf = s->priv_data;
550     uint32_t packet_length, padsize;
551     int rsize = 8;
552     int c, d, e, off;
553
554     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
555
556     c=d=e=-1;
557     while(off-- > 0){
558         c=d; d=e;
559         e= get_byte(pb);
560         if(c == 0x82 && !d && !e)
561             break;
562     }
563
564     if (c != 0x82) {
565         if (!url_feof(pb))
566             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
567     }
568     if ((c & 0x8f) == 0x82) {
569         if (d || e) {
570             if (!url_feof(pb))
571                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
572             return -1;
573         }
574         c= get_byte(pb);
575         d= get_byte(pb);
576         rsize+=3;
577     }else{
578         url_fseek(pb, -1, SEEK_CUR); //FIXME
579     }
580
581     asf->packet_flags    = c;
582     asf->packet_property = d;
583
584     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
585     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
586     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
587
588     //the following checks prevent overflows and infinite loops
589     if(packet_length >= (1U<<29)){
590         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
591         return -1;
592     }
593     if(padsize >= packet_length){
594         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
595         return -1;
596     }
597
598     asf->packet_timestamp = get_le32(pb);
599     get_le16(pb); /* duration */
600     // rsize has at least 11 bytes which have to be present
601
602     if (asf->packet_flags & 0x01) {
603         asf->packet_segsizetype = get_byte(pb); rsize++;
604         asf->packet_segments = asf->packet_segsizetype & 0x3f;
605     } else {
606         asf->packet_segments = 1;
607         asf->packet_segsizetype = 0x80;
608     }
609     asf->packet_size_left = packet_length - padsize - rsize;
610     if (packet_length < asf->hdr.min_pktsize)
611         padsize += asf->hdr.min_pktsize - packet_length;
612     asf->packet_padsize = padsize;
613     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
614     return 0;
615 }
616
617 /**
618  *
619  * @return <0 if error
620  */
621 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
622     ASFContext *asf = s->priv_data;
623     int rsize = 1;
624     int num = get_byte(pb);
625     int64_t ts0, ts1;
626
627     asf->packet_segments--;
628     asf->packet_key_frame = num >> 7;
629     asf->stream_index = asf->asfid2avid[num & 0x7f];
630     // sequence should be ignored!
631     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
632     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
633     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
634 //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);
635     if (asf->packet_replic_size >= 8) {
636         asf->packet_obj_size = get_le32(pb);
637         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
638             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
639             return -1;
640         }
641         asf->packet_frag_timestamp = get_le32(pb); // timestamp
642         if(asf->packet_replic_size >= 8+38+4){
643 //            for(i=0; i<asf->packet_replic_size-8; i++)
644 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
645 //            av_log(s, AV_LOG_DEBUG, "\n");
646             url_fskip(pb, 10);
647             ts0= get_le64(pb);
648             ts1= get_le64(pb);
649             url_fskip(pb, 12);
650             get_le32(pb);
651             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
652             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
653             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
654         }else
655             url_fskip(pb, asf->packet_replic_size - 8);
656         rsize += asf->packet_replic_size; // FIXME - check validity
657     } else if (asf->packet_replic_size==1){
658         // multipacket - frag_offset is beginning timestamp
659         asf->packet_time_start = asf->packet_frag_offset;
660         asf->packet_frag_offset = 0;
661         asf->packet_frag_timestamp = asf->packet_timestamp;
662
663         asf->packet_time_delta = get_byte(pb);
664         rsize++;
665     }else if(asf->packet_replic_size!=0){
666         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
667         return -1;
668     }
669     if (asf->packet_flags & 0x01) {
670         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
671         if(asf->packet_frag_size > asf->packet_size_left - rsize){
672             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
673             return -1;
674         }
675         //printf("Fragsize %d\n", asf->packet_frag_size);
676     } else {
677         asf->packet_frag_size = asf->packet_size_left - rsize;
678         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
679     }
680     if (asf->packet_replic_size == 1) {
681         asf->packet_multi_size = asf->packet_frag_size;
682         if (asf->packet_multi_size > asf->packet_size_left)
683             return -1;
684     }
685     asf->packet_size_left -= rsize;
686     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
687
688     return 0;
689 }
690
691 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
692 {
693     ASFContext *asf = s->priv_data;
694     ASFStream *asf_st = 0;
695     for (;;) {
696         if(url_feof(pb))
697             return AVERROR(EIO);
698         if (asf->packet_size_left < FRAME_HEADER_SIZE
699             || asf->packet_segments < 1) {
700             //asf->packet_size_left <= asf->packet_padsize) {
701             int ret = asf->packet_size_left + asf->packet_padsize;
702             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
703             assert(ret>=0);
704             /* fail safe */
705             url_fskip(pb, ret);
706
707             asf->packet_pos= url_ftell(pb);
708             if (asf->data_object_size != (uint64_t)-1 &&
709                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
710                 return AVERROR(EIO); /* Do not exceed the size of the data object */
711             return 1;
712         }
713         if (asf->packet_time_start == 0) {
714             if(asf_read_frame_header(s, pb) < 0){
715                 asf->packet_segments= 0;
716                 continue;
717             }
718             if (asf->stream_index < 0
719                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
720                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
721                 ) {
722                 asf->packet_time_start = 0;
723                 /* unhandled packet (should not happen) */
724                 url_fskip(pb, asf->packet_frag_size);
725                 asf->packet_size_left -= asf->packet_frag_size;
726                 if(asf->stream_index < 0)
727                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
728                 continue;
729             }
730             asf->asf_st = s->streams[asf->stream_index]->priv_data;
731         }
732         asf_st = asf->asf_st;
733
734         if (asf->packet_replic_size == 1) {
735             // frag_offset is here used as the beginning timestamp
736             asf->packet_frag_timestamp = asf->packet_time_start;
737             asf->packet_time_start += asf->packet_time_delta;
738             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
739             asf->packet_size_left--;
740             asf->packet_multi_size--;
741             if (asf->packet_multi_size < asf->packet_obj_size)
742             {
743                 asf->packet_time_start = 0;
744                 url_fskip(pb, asf->packet_multi_size);
745                 asf->packet_size_left -= asf->packet_multi_size;
746                 continue;
747             }
748             asf->packet_multi_size -= asf->packet_obj_size;
749             //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);
750         }
751         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
752               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
753            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
754             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
755                 asf_st->frag_offset, asf->packet_frag_size,
756                 asf->packet_obj_size, asf_st->pkt.size);
757             asf->packet_obj_size= asf_st->pkt.size;
758         }
759
760         if (   asf_st->pkt.size != asf->packet_obj_size
761             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
762             if(asf_st->pkt.data){
763                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
764                 asf_st->frag_offset = 0;
765                 av_free_packet(&asf_st->pkt);
766             }
767             /* new packet */
768             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
769             asf_st->seq = asf->packet_seq;
770             asf_st->pkt.dts = asf->packet_frag_timestamp;
771             asf_st->pkt.stream_index = asf->stream_index;
772             asf_st->pkt.pos =
773             asf_st->packet_pos= asf->packet_pos;
774 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
775 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
776 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
777             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
778                 asf->packet_key_frame = 1;
779             if (asf->packet_key_frame)
780                 asf_st->pkt.flags |= PKT_FLAG_KEY;
781         }
782
783         /* read data */
784         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
785         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
786         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
787         asf->packet_size_left -= asf->packet_frag_size;
788         if (asf->packet_size_left < 0)
789             continue;
790
791         if(   asf->packet_frag_offset >= asf_st->pkt.size
792            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
793             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
794                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
795             continue;
796         }
797
798         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
799                    asf->packet_frag_size);
800         if (s->key && s->keylen == 20)
801             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
802                             asf->packet_frag_size);
803         asf_st->frag_offset += asf->packet_frag_size;
804         /* test if whole packet is read */
805         if (asf_st->frag_offset == asf_st->pkt.size) {
806             //workaround for macroshit radio DVR-MS files
807             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
808                && asf_st->pkt.size > 100){
809                 int i;
810                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
811                 if(i == asf_st->pkt.size){
812                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
813                     asf_st->frag_offset = 0;
814                     av_free_packet(&asf_st->pkt);
815                     continue;
816                 }
817             }
818
819             /* return packet */
820             if (asf_st->ds_span > 1) {
821               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
822                     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);
823               }else{
824                 /* packet descrambling */
825                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
826                 if (newdata) {
827                     int offset = 0;
828                     while (offset < asf_st->pkt.size) {
829                         int off = offset / asf_st->ds_chunk_size;
830                         int row = off / asf_st->ds_span;
831                         int col = off % asf_st->ds_span;
832                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
833                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
834
835                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
836                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
837                         memcpy(newdata + offset,
838                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
839                                asf_st->ds_chunk_size);
840                         offset += asf_st->ds_chunk_size;
841                     }
842                     av_free(asf_st->pkt.data);
843                     asf_st->pkt.data = newdata;
844                 }
845               }
846             }
847             asf_st->frag_offset = 0;
848             *pkt= asf_st->pkt;
849             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
850             asf_st->pkt.size = 0;
851             asf_st->pkt.data = 0;
852             break; // packet completed
853         }
854     }
855     return 0;
856 }
857
858 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
859 {
860     ASFContext *asf = s->priv_data;
861
862     for (;;) {
863         int ret;
864
865         /* parse cached packets, if any */
866         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
867             return ret;
868         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
869             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
870         asf->packet_time_start = 0;
871     }
872
873     return 0;
874 }
875
876 // Added to support seeking after packets have been read
877 // If information is not reset, read_packet fails due to
878 // leftover information from previous reads
879 static void asf_reset_header(AVFormatContext *s)
880 {
881     ASFContext *asf = s->priv_data;
882     ASFStream *asf_st;
883     int i;
884
885     asf->packet_nb_frames = 0;
886     asf->packet_size_left = 0;
887     asf->packet_segments = 0;
888     asf->packet_flags = 0;
889     asf->packet_property = 0;
890     asf->packet_timestamp = 0;
891     asf->packet_segsizetype = 0;
892     asf->packet_segments = 0;
893     asf->packet_seq = 0;
894     asf->packet_replic_size = 0;
895     asf->packet_key_frame = 0;
896     asf->packet_padsize = 0;
897     asf->packet_frag_offset = 0;
898     asf->packet_frag_size = 0;
899     asf->packet_frag_timestamp = 0;
900     asf->packet_multi_size = 0;
901     asf->packet_obj_size = 0;
902     asf->packet_time_delta = 0;
903     asf->packet_time_start = 0;
904
905     for(i=0; i<s->nb_streams; i++){
906         asf_st= s->streams[i]->priv_data;
907         av_free_packet(&asf_st->pkt);
908         asf_st->frag_offset=0;
909         asf_st->seq=0;
910     }
911     asf->asf_st= NULL;
912 }
913
914 static int asf_read_close(AVFormatContext *s)
915 {
916     int i;
917
918     asf_reset_header(s);
919     for(i=0;i<s->nb_streams;i++) {
920         AVStream *st = s->streams[i];
921         av_free(st->codec->palctrl);
922     }
923     return 0;
924 }
925
926 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
927 {
928     ASFContext *asf = s->priv_data;
929     AVPacket pkt1, *pkt = &pkt1;
930     ASFStream *asf_st;
931     int64_t pts;
932     int64_t pos= *ppos;
933     int i;
934     int64_t start_pos[s->nb_streams];
935
936     for(i=0; i<s->nb_streams; i++){
937         start_pos[i]= pos;
938     }
939
940     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
941     *ppos= pos;
942     url_fseek(s->pb, pos, SEEK_SET);
943
944 //printf("asf_read_pts\n");
945     asf_reset_header(s);
946     for(;;){
947         if (av_read_frame(s, pkt) < 0){
948             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
949             return AV_NOPTS_VALUE;
950         }
951
952         pts= pkt->pts;
953
954         av_free_packet(pkt);
955         if(pkt->flags&PKT_FLAG_KEY){
956             i= pkt->stream_index;
957
958             asf_st= s->streams[i]->priv_data;
959
960 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
961             pos= asf_st->packet_pos;
962
963             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
964             start_pos[i]= asf_st->packet_pos + 1;
965
966             if(pkt->stream_index == stream_index)
967                break;
968         }
969     }
970
971     *ppos= pos;
972 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
973
974     return pts;
975 }
976
977 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
978 {
979     GUID g;
980     ASFContext *asf = s->priv_data;
981     int64_t gsize, itime;
982     int64_t pos, current_pos, index_pts;
983     int i;
984     int pct,ict;
985
986     current_pos = url_ftell(s->pb);
987
988     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
989     get_guid(s->pb, &g);
990     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
991         gsize = get_le64(s->pb);
992         get_guid(s->pb, &g);
993         itime=get_le64(s->pb);
994         pct=get_le32(s->pb);
995         ict=get_le32(s->pb);
996         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
997
998         for (i=0;i<ict;i++){
999             int pktnum=get_le32(s->pb);
1000             int pktct =get_le16(s->pb);
1001             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1002
1003             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
1004             index_pts=av_rescale(itime, i, 10000);
1005
1006             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1007         }
1008         asf->index_read= 1;
1009     }
1010     url_fseek(s->pb, current_pos, SEEK_SET);
1011 }
1012
1013 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1014 {
1015     ASFContext *asf = s->priv_data;
1016     AVStream *st = s->streams[stream_index];
1017     int64_t pos;
1018     int index;
1019
1020     if (asf->packet_size <= 0)
1021         return -1;
1022
1023     /* Try using the protocol's read_seek if available */
1024     if(s->pb) {
1025         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1026         if(ret >= 0)
1027             asf_reset_header(s);
1028         if (ret != AVERROR(ENOSYS))
1029             return ret;
1030     }
1031
1032     if (!asf->index_read)
1033         asf_build_simple_index(s, stream_index);
1034
1035     if(!(asf->index_read && st->index_entries)){
1036         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1037             return -1;
1038     }else{
1039         index= av_index_search_timestamp(st, pts, flags);
1040         if(index<0)
1041             return -1;
1042
1043         /* find the position */
1044         pos = st->index_entries[index].pos;
1045         pts = st->index_entries[index].timestamp;
1046
1047     // various attempts to find key frame have failed so far
1048     //    asf_reset_header(s);
1049     //    url_fseek(s->pb, pos, SEEK_SET);
1050     //    key_pos = pos;
1051     //     for(i=0;i<16;i++){
1052     //         pos = url_ftell(s->pb);
1053     //         if (av_read_frame(s, &pkt) < 0){
1054     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1055     //             return -1;
1056     //         }
1057     //         asf_st = s->streams[stream_index]->priv_data;
1058     //         pos += st->parser->frame_offset;
1059     //
1060     //         if (pkt.size > b) {
1061     //             b = pkt.size;
1062     //             key_pos = pos;
1063     //         }
1064     //
1065     //         av_free_packet(&pkt);
1066     //     }
1067
1068         /* do the seek */
1069         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1070         url_fseek(s->pb, pos, SEEK_SET);
1071     }
1072     asf_reset_header(s);
1073     return 0;
1074 }
1075
1076 AVInputFormat asf_demuxer = {
1077     "asf",
1078     NULL_IF_CONFIG_SMALL("ASF format"),
1079     sizeof(ASFContext),
1080     asf_probe,
1081     asf_read_header,
1082     asf_read_packet,
1083     asf_read_close,
1084     asf_read_seek,
1085     asf_read_pts,
1086 };