set bit rate for asf format, patch by Zuxy Meng, zuxy meng gmail com
[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
27 #undef NDEBUG
28 #include <assert.h>
29
30 #define FRAME_HEADER_SIZE 17
31 // Fix Me! FRAME_HEADER_SIZE may be different.
32
33 static const GUID index_guid = {
34     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
35 };
36
37 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
38     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
39 };
40 /**********************************/
41 /* decoding */
42
43 //#define DEBUG
44
45 #ifdef DEBUG
46 #define PRINT_IF_GUID(g,cmp) \
47 if (!memcmp(g, &cmp, sizeof(GUID))) \
48     printf("(GUID: %s) ", #cmp)
49
50 static void print_guid(const GUID *g)
51 {
52     int i;
53     PRINT_IF_GUID(g, asf_header);
54     else PRINT_IF_GUID(g, file_header);
55     else PRINT_IF_GUID(g, stream_header);
56     else PRINT_IF_GUID(g, audio_stream);
57     else PRINT_IF_GUID(g, audio_conceal_none);
58     else PRINT_IF_GUID(g, video_stream);
59     else PRINT_IF_GUID(g, video_conceal_none);
60     else PRINT_IF_GUID(g, command_stream);
61     else PRINT_IF_GUID(g, comment_header);
62     else PRINT_IF_GUID(g, codec_comment_header);
63     else PRINT_IF_GUID(g, codec_comment1_header);
64     else PRINT_IF_GUID(g, data_header);
65     else PRINT_IF_GUID(g, index_guid);
66     else PRINT_IF_GUID(g, head1_guid);
67     else PRINT_IF_GUID(g, head2_guid);
68     else PRINT_IF_GUID(g, my_guid);
69     else PRINT_IF_GUID(g, ext_stream_header);
70     else PRINT_IF_GUID(g, extended_content_header);
71     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
72     else PRINT_IF_GUID(g, ext_stream_audio_stream);
73     else PRINT_IF_GUID(g, metadata_header);
74     else PRINT_IF_GUID(g, stream_bitrate_guid);
75     else
76         printf("(GUID: unknown) ");
77     for(i=0;i<16;i++)
78         printf(" 0x%02x,", (*g)[i]);
79     printf("}\n");
80 }
81 #undef PRINT_IF_GUID
82 #endif
83
84 static void get_guid(ByteIOContext *s, GUID *g)
85 {
86     assert(sizeof(*g) == 16);
87     get_buffer(s, g, sizeof(*g));
88 }
89
90 #if 0
91 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
92 {
93     int len, c;
94     char *q;
95
96     len = get_le16(pb);
97     q = buf;
98     while (len > 0) {
99         c = get_le16(pb);
100         if ((q - buf) < buf_size - 1)
101             *q++ = c;
102         len--;
103     }
104     *q = '\0';
105 }
106 #endif
107
108 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
109 {
110     char* q = buf;
111     len /= 2;
112     while (len--) {
113         uint8_t tmp;
114         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
115     }
116     *q = '\0';
117 }
118
119 static int asf_probe(AVProbeData *pd)
120 {
121     /* check file header */
122     if (pd->buf_size <= 32)
123         return 0;
124
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;
203             int test_for_ext_stream_audio;
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             st->start_time = asf->hdr.preroll;
216             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
217                 st->duration = asf->hdr.send_time /
218                     (10000000 / 1000) - st->start_time;
219             }
220             get_guid(pb, &g);
221
222             test_for_ext_stream_audio = 0;
223             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
224                 type = CODEC_TYPE_AUDIO;
225             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
226                 type = CODEC_TYPE_VIDEO;
227             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
228                 type = CODEC_TYPE_UNKNOWN;
229             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
230                 test_for_ext_stream_audio = 1;
231                 type = CODEC_TYPE_UNKNOWN;
232             } else {
233                 goto fail;
234             }
235             get_guid(pb, &g);
236             total_size = get_le64(pb);
237             type_specific_size = get_le32(pb);
238             get_le32(pb);
239             st->id = get_le16(pb) & 0x7f; /* stream id */
240             // mapping of asf ID to AV stream ID;
241             asf->asfid2avid[st->id] = s->nb_streams - 1;
242
243             get_le32(pb);
244
245             if (test_for_ext_stream_audio) {
246                 get_guid(pb, &g);
247                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
248                     type = CODEC_TYPE_AUDIO;
249                     get_guid(pb, &g);
250                     get_le32(pb);
251                     get_le32(pb);
252                     get_le32(pb);
253                     get_guid(pb, &g);
254                     get_le32(pb);
255                 }
256             }
257
258             st->codec->codec_type = type;
259             if (type == CODEC_TYPE_AUDIO) {
260                 get_wav_header(pb, st->codec, type_specific_size);
261                 st->need_parsing = 1;
262                 /* We have to init the frame size at some point .... */
263                 pos2 = url_ftell(pb);
264                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
265                     asf_st->ds_span = get_byte(pb);
266                     asf_st->ds_packet_size = get_le16(pb);
267                     asf_st->ds_chunk_size = get_le16(pb);
268                     get_le16(pb); //ds_data_size
269                     get_byte(pb); //ds_silence_data
270                 }
271                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
272                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
273                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
274                 if (asf_st->ds_span > 1) {
275                     if (!asf_st->ds_chunk_size
276                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
277                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
278                         asf_st->ds_span = 0; // disable descrambling
279                 }
280                 switch (st->codec->codec_id) {
281                 case CODEC_ID_MP3:
282                     st->codec->frame_size = MPA_FRAME_SIZE;
283                     break;
284                 case CODEC_ID_PCM_S16LE:
285                 case CODEC_ID_PCM_S16BE:
286                 case CODEC_ID_PCM_U16LE:
287                 case CODEC_ID_PCM_U16BE:
288                 case CODEC_ID_PCM_S8:
289                 case CODEC_ID_PCM_U8:
290                 case CODEC_ID_PCM_ALAW:
291                 case CODEC_ID_PCM_MULAW:
292                     st->codec->frame_size = 1;
293                     break;
294                 default:
295                     /* This is probably wrong, but it prevents a crash later */
296                     st->codec->frame_size = 1;
297                     break;
298                 }
299             } else if (type == CODEC_TYPE_VIDEO) {
300                 get_le32(pb);
301                 get_le32(pb);
302                 get_byte(pb);
303                 size = get_le16(pb); /* size */
304                 sizeX= get_le32(pb); /* size */
305                 st->codec->width = get_le32(pb);
306                 st->codec->height = get_le32(pb);
307                 /* not available for asf */
308                 get_le16(pb); /* panes */
309                 st->codec->bits_per_sample = get_le16(pb); /* depth */
310                 tag1 = get_le32(pb);
311                 url_fskip(pb, 20);
312 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
313                 size= sizeX;
314                 if (size > 40) {
315                     st->codec->extradata_size = size - 40;
316                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
317                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
318                 }
319
320         /* Extract palette from extradata if bpp <= 8 */
321         /* This code assumes that extradata contains only palette */
322         /* This is true for all paletted codecs implemented in ffmpeg */
323         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
324             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
325 #ifdef WORDS_BIGENDIAN
326             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
327                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
328 #else
329             memcpy(st->codec->palctrl->palette, st->codec->extradata,
330                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
331 #endif
332             st->codec->palctrl->palette_changed = 1;
333         }
334
335                 st->codec->codec_tag = tag1;
336                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
337                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
338                     st->need_parsing = 1;
339             }
340             pos2 = url_ftell(pb);
341             url_fskip(pb, gsize - (pos2 - pos1 + 24));
342         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
343             int len1, len2, len3, len4, len5;
344
345             len1 = get_le16(pb);
346             len2 = get_le16(pb);
347             len3 = get_le16(pb);
348             len4 = get_le16(pb);
349             len5 = get_le16(pb);
350             get_str16_nolen(pb, len1, s->title    , sizeof(s->title));
351             get_str16_nolen(pb, len2, s->author   , sizeof(s->author));
352             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
353             get_str16_nolen(pb, len4, s->comment  , sizeof(s->comment));
354             url_fskip(pb, len5);
355         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
356             int stream_count = get_le16(pb);
357             int j;
358
359 //            av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
360 //            av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
361             for(j = 0; j < stream_count; j++) {
362                 int flags, bitrate, stream_id;
363
364                 flags= get_le16(pb);
365                 bitrate= get_le32(pb);
366                 stream_id= (flags & 0x7f);
367 //                av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
368                 asf->stream_bitrates[stream_id-1]= bitrate;
369             }
370        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
371                 int desc_count, i;
372
373                 desc_count = get_le16(pb);
374                 for(i=0;i<desc_count;i++)
375                 {
376                         int name_len,value_type,value_len;
377                         uint64_t value_num = 0;
378                         char name[1024];
379
380                         name_len = get_le16(pb);
381                         get_str16_nolen(pb, name_len, name, sizeof(name));
382                         value_type = get_le16(pb);
383                         value_len = get_le16(pb);
384                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
385                         {
386                                 if     (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
387                                 else if(!strcmp(name,"WM/Genre"     )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
388                                 else url_fskip(pb, value_len);
389                         }
390                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
391                         {
392                                 value_num= get_value(pb, value_type);
393                                 if (!strcmp(name,"WM/Track"      )) s->track = value_num + 1;
394                                 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
395                         }
396                 }
397         } else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
398             int n, stream_num, name_len, value_len, value_type, value_num;
399             n = get_le16(pb);
400
401             for(i=0;i<n;i++) {
402                 char name[1024];
403
404                 get_le16(pb); //lang_list_index
405                 stream_num= get_le16(pb);
406                 name_len=   get_le16(pb);
407                 value_type= get_le16(pb);
408                 value_len=  get_le32(pb);
409
410                 get_str16_nolen(pb, name_len, name, sizeof(name));
411 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
412                 value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
413                 url_fskip(pb, value_len - 2);
414
415                 if(stream_num<128){
416                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
417                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
418                 }
419             }
420         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
421             int ext_len, payload_ext_ct, stream_ct;
422             uint32_t ext_d, leak_rate, stream_num;
423             int64_t pos_ex_st;
424             pos_ex_st = url_ftell(pb);
425
426             get_le64(pb); // starttime
427             get_le64(pb); // endtime
428             leak_rate = get_le32(pb); // leak-datarate
429             get_le32(pb); // bucket-datasize
430             get_le32(pb); // init-bucket-fullness
431             get_le32(pb); // alt-leak-datarate
432             get_le32(pb); // alt-bucket-datasize
433             get_le32(pb); // alt-init-bucket-fullness
434             get_le32(pb); // max-object-size
435             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
436             stream_num = get_le16(pb); // stream-num
437             get_le16(pb); // stream-language-id-index
438             get_le64(pb); // avg frametime in 100ns units
439             stream_ct = get_le16(pb); //stream-name-count
440             payload_ext_ct = get_le16(pb); //payload-extension-system-count
441
442             if (stream_num < 128)
443                 bitrate[stream_num] = leak_rate;
444
445             for (i=0; i<stream_ct; i++){
446                 get_le16(pb);
447                 ext_len = get_le16(pb);
448                 url_fseek(pb, ext_len, SEEK_CUR);
449             }
450
451             for (i=0; i<payload_ext_ct; i++){
452                 get_guid(pb, &g);
453                 ext_d=get_le16(pb);
454                 ext_len=get_le32(pb);
455                 url_fseek(pb, ext_len, SEEK_CUR);
456             }
457
458             // there could be a optional stream properties object to follow
459             // if so the next iteration will pick it up
460         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
461             int v1, v2;
462             get_guid(pb, &g);
463             v1 = get_le32(pb);
464             v2 = get_le16(pb);
465 #if 0
466         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
467             int len, v1, n, num;
468             char str[256], *q;
469             char tag[16];
470
471             get_guid(pb, &g);
472             print_guid(&g);
473
474             n = get_le32(pb);
475             for(i=0;i<n;i++) {
476                 num = get_le16(pb); /* stream number */
477                 get_str16(pb, str, sizeof(str));
478                 get_str16(pb, str, sizeof(str));
479                 len = get_le16(pb);
480                 q = tag;
481                 while (len > 0) {
482                     v1 = get_byte(pb);
483                     if ((q - tag) < sizeof(tag) - 1)
484                         *q++ = v1;
485                     len--;
486                 }
487                 *q = '\0';
488             }
489 #endif
490         } else if (url_feof(pb)) {
491             goto fail;
492         } else {
493             url_fseek(pb, gsize - 24, SEEK_CUR);
494         }
495     }
496     get_guid(pb, &g);
497     get_le64(pb);
498     get_byte(pb);
499     get_byte(pb);
500     if (url_feof(pb))
501         goto fail;
502     asf->data_offset = url_ftell(pb);
503     asf->packet_size_left = 0;
504
505
506     for(i=0; i<128; i++){
507         int stream_num= asf->asfid2avid[i];
508         if(stream_num>=0){
509             AVCodecContext *codec= s->streams[stream_num]->codec;
510             codec->bit_rate = bitrate[i];
511             if (dar[i].num > 0 && dar[i].den > 0)
512                 av_reduce(&codec->sample_aspect_ratio.num,
513                         &codec->sample_aspect_ratio.den,
514                         dar[i].num, dar[i].den, INT_MAX);
515 //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);
516         }
517     }
518
519     return 0;
520
521  fail:
522      for(i=0;i<s->nb_streams;i++) {
523         AVStream *st = s->streams[i];
524         if (st) {
525             av_free(st->priv_data);
526             av_free(st->codec->extradata);
527         }
528         av_free(st);
529     }
530     return -1;
531 }
532
533 #define DO_2BITS(bits, var, defval) \
534     switch (bits & 3) \
535     { \
536     case 3: var = get_le32(pb); rsize += 4; break; \
537     case 2: var = get_le16(pb); rsize += 2; break; \
538     case 1: var = get_byte(pb); rsize++; break; \
539     default: var = defval; break; \
540     }
541
542 /**
543  *
544  * @return <0 in case of an error
545  */
546 static int asf_get_packet(AVFormatContext *s)
547 {
548     ASFContext *asf = s->priv_data;
549     ByteIOContext *pb = &s->pb;
550     uint32_t packet_length, padsize;
551     int rsize = 9;
552     int c, d, e, off;
553
554     off= (url_ftell(&s->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 & 0x0f) == 2) { // always true for now
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         d= get_byte(pb);
575         e= get_byte(pb);
576         rsize+=2;
577 /*    }else{
578         if (!url_feof(pb))
579             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
580         return AVERROR_IO;*/
581     }
582
583     asf->packet_flags = d;
584     asf->packet_property = e;
585
586     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
587     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
588     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
589
590     //the following checks prevent overflows and infinite loops
591     if(packet_length >= (1U<<29)){
592         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
593         return -1;
594     }
595     if(padsize >= packet_length){
596         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
597         return -1;
598     }
599
600     asf->packet_timestamp = get_le32(pb);
601     get_le16(pb); /* duration */
602     // rsize has at least 11 bytes which have to be present
603
604     if (asf->packet_flags & 0x01) {
605         asf->packet_segsizetype = get_byte(pb); rsize++;
606         asf->packet_segments = asf->packet_segsizetype & 0x3f;
607     } else {
608         asf->packet_segments = 1;
609         asf->packet_segsizetype = 0x80;
610     }
611     asf->packet_size_left = packet_length - padsize - rsize;
612     if (packet_length < asf->hdr.min_pktsize)
613         padsize += asf->hdr.min_pktsize - packet_length;
614     asf->packet_padsize = padsize;
615 #ifdef DEBUG
616     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
617 #endif
618     return 0;
619 }
620
621 /**
622  *
623  * @return <0 if error
624  */
625 static int asf_read_frame_header(AVFormatContext *s){
626     ASFContext *asf = s->priv_data;
627     ByteIOContext *pb = &s->pb;
628     int rsize = 1;
629     int num = get_byte(pb);
630     int64_t ts0, ts1;
631
632     asf->packet_segments--;
633     asf->packet_key_frame = num >> 7;
634     asf->stream_index = asf->asfid2avid[num & 0x7f];
635     // sequence should be ignored!
636     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
637     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
638     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
639 //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);
640     if (asf->packet_replic_size >= 8) {
641         asf->packet_obj_size = get_le32(pb);
642         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
643             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
644             return -1;
645         }
646         asf->packet_frag_timestamp = get_le32(pb); // timestamp
647         if(asf->packet_replic_size >= 8+38+4){
648 //            for(i=0; i<asf->packet_replic_size-8; i++)
649 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
650 //            av_log(s, AV_LOG_DEBUG, "\n");
651             url_fskip(pb, 10);
652             ts0= get_le64(pb);
653             ts1= get_le64(pb);
654             url_fskip(pb, 12);
655             get_le32(pb);
656             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
657             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
658             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
659         }else
660             url_fskip(pb, asf->packet_replic_size - 8);
661         rsize += asf->packet_replic_size; // FIXME - check validity
662     } else if (asf->packet_replic_size==1){
663         // multipacket - frag_offset is begining timestamp
664         asf->packet_time_start = asf->packet_frag_offset;
665         asf->packet_frag_offset = 0;
666         asf->packet_frag_timestamp = asf->packet_timestamp;
667
668         asf->packet_time_delta = get_byte(pb);
669         rsize++;
670     }else if(asf->packet_replic_size!=0){
671         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
672         return -1;
673     }
674     if (asf->packet_flags & 0x01) {
675         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
676         if(asf->packet_frag_size > asf->packet_size_left - rsize){
677             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
678             return -1;
679         }
680         //printf("Fragsize %d\n", asf->packet_frag_size);
681     } else {
682         asf->packet_frag_size = asf->packet_size_left - rsize;
683         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
684     }
685     if (asf->packet_replic_size == 1) {
686         asf->packet_multi_size = asf->packet_frag_size;
687         if (asf->packet_multi_size > asf->packet_size_left)
688             return -1;
689     }
690     asf->packet_size_left -= rsize;
691     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
692
693     return 0;
694 }
695
696 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
697 {
698     ASFContext *asf = s->priv_data;
699     ASFStream *asf_st = 0;
700     ByteIOContext *pb = &s->pb;
701     //static int pc = 0;
702     for (;;) {
703         if(url_feof(pb))
704             return AVERROR_IO;
705         if (asf->packet_size_left < FRAME_HEADER_SIZE
706             || asf->packet_segments < 1) {
707             //asf->packet_size_left <= asf->packet_padsize) {
708             int ret = asf->packet_size_left + asf->packet_padsize;
709             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
710             assert(ret>=0);
711             /* fail safe */
712             url_fskip(pb, ret);
713
714             asf->packet_pos= url_ftell(&s->pb);
715             if (asf->data_object_size != (uint64_t)-1 &&
716                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
717                 return AVERROR_IO; /* Do not exceed the size of the data object */
718             ret = asf_get_packet(s);
719             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
720             if (ret < 0)
721                 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
722             asf->packet_time_start = 0;
723             continue;
724         }
725         if (asf->packet_time_start == 0) {
726             if(asf_read_frame_header(s) < 0){
727                 asf->packet_segments= 0;
728                 continue;
729             }
730             if (asf->stream_index < 0
731                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
732                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
733                 ) {
734                 asf->packet_time_start = 0;
735                 /* unhandled packet (should not happen) */
736                 url_fskip(pb, asf->packet_frag_size);
737                 asf->packet_size_left -= asf->packet_frag_size;
738                 if(asf->stream_index < 0)
739                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
740                 continue;
741             }
742             asf->asf_st = s->streams[asf->stream_index]->priv_data;
743         }
744         asf_st = asf->asf_st;
745
746         if (asf->packet_replic_size == 1) {
747             // frag_offset is here used as the begining timestamp
748             asf->packet_frag_timestamp = asf->packet_time_start;
749             asf->packet_time_start += asf->packet_time_delta;
750             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
751             asf->packet_size_left--;
752             asf->packet_multi_size--;
753             if (asf->packet_multi_size < asf->packet_obj_size)
754             {
755                 asf->packet_time_start = 0;
756                 url_fskip(pb, asf->packet_multi_size);
757                 asf->packet_size_left -= asf->packet_multi_size;
758                 continue;
759             }
760             asf->packet_multi_size -= asf->packet_obj_size;
761             //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);
762         }
763         if (   asf_st->pkt.size != asf->packet_obj_size
764             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
765             if(asf_st->pkt.data){
766                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
767                 asf_st->frag_offset = 0;
768                 av_free_packet(&asf_st->pkt);
769             }
770             /* new packet */
771             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
772             asf_st->seq = asf->packet_seq;
773             asf_st->pkt.pts = asf->packet_frag_timestamp;
774             asf_st->pkt.stream_index = asf->stream_index;
775             asf_st->pkt.pos =
776             asf_st->packet_pos= asf->packet_pos;
777 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
778 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
779 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
780             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
781                 asf->packet_key_frame = 1;
782             if (asf->packet_key_frame)
783                 asf_st->pkt.flags |= PKT_FLAG_KEY;
784         }
785
786         /* read data */
787         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
788         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
789         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
790         asf->packet_size_left -= asf->packet_frag_size;
791         if (asf->packet_size_left < 0)
792             continue;
793
794         if(   asf->packet_frag_offset >= asf_st->pkt.size
795            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
796             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
797                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
798             continue;
799         }
800
801         get_buffer(pb, 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             /* return packet */
807             if (asf_st->ds_span > 1) {
808               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
809                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
810               }else{
811                 /* packet descrambling */
812                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
813                 if (newdata) {
814                     int offset = 0;
815                     while (offset < asf_st->pkt.size) {
816                         int off = offset / asf_st->ds_chunk_size;
817                         int row = off / asf_st->ds_span;
818                         int col = off % asf_st->ds_span;
819                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
820                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
821
822                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
823                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
824                         memcpy(newdata + offset,
825                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
826                                asf_st->ds_chunk_size);
827                         offset += asf_st->ds_chunk_size;
828                     }
829                     av_free(asf_st->pkt.data);
830                     asf_st->pkt.data = newdata;
831                 }
832               }
833             }
834             asf_st->frag_offset = 0;
835             *pkt= asf_st->pkt;
836             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
837             asf_st->pkt.size = 0;
838             asf_st->pkt.data = 0;
839             break; // packet completed
840         }
841     }
842     return 0;
843 }
844
845 static int asf_read_close(AVFormatContext *s)
846 {
847     int i;
848
849     for(i=0;i<s->nb_streams;i++) {
850         AVStream *st = s->streams[i];
851         av_free(st->priv_data);
852         av_free(st->codec->palctrl);
853     }
854     return 0;
855 }
856
857 // Added to support seeking after packets have been read
858 // If information is not reset, read_packet fails due to
859 // leftover information from previous reads
860 static void asf_reset_header(AVFormatContext *s)
861 {
862     ASFContext *asf = s->priv_data;
863     ASFStream *asf_st;
864     int i;
865
866     asf->packet_nb_frames = 0;
867     asf->packet_size_left = 0;
868     asf->packet_segments = 0;
869     asf->packet_flags = 0;
870     asf->packet_property = 0;
871     asf->packet_timestamp = 0;
872     asf->packet_segsizetype = 0;
873     asf->packet_segments = 0;
874     asf->packet_seq = 0;
875     asf->packet_replic_size = 0;
876     asf->packet_key_frame = 0;
877     asf->packet_padsize = 0;
878     asf->packet_frag_offset = 0;
879     asf->packet_frag_size = 0;
880     asf->packet_frag_timestamp = 0;
881     asf->packet_multi_size = 0;
882     asf->packet_obj_size = 0;
883     asf->packet_time_delta = 0;
884     asf->packet_time_start = 0;
885
886     for(i=0; i<s->nb_streams; i++){
887         asf_st= s->streams[i]->priv_data;
888         av_free_packet(&asf_st->pkt);
889         asf_st->frag_offset=0;
890         asf_st->seq=0;
891     }
892     asf->asf_st= NULL;
893 }
894
895 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
896 {
897     ASFContext *asf = s->priv_data;
898     AVPacket pkt1, *pkt = &pkt1;
899     ASFStream *asf_st;
900     int64_t pts;
901     int64_t pos= *ppos;
902     int i;
903     int64_t start_pos[s->nb_streams];
904
905     for(i=0; i<s->nb_streams; i++){
906         start_pos[i]= pos;
907     }
908
909     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
910     *ppos= pos;
911     url_fseek(&s->pb, pos, SEEK_SET);
912
913 //printf("asf_read_pts\n");
914     asf_reset_header(s);
915     for(;;){
916         if (av_read_frame(s, pkt) < 0){
917             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
918             return AV_NOPTS_VALUE;
919         }
920
921         pts= pkt->pts;
922
923         av_free_packet(pkt);
924         if(pkt->flags&PKT_FLAG_KEY){
925             i= pkt->stream_index;
926
927             asf_st= s->streams[i]->priv_data;
928
929 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
930             pos= asf_st->packet_pos;
931
932             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
933             start_pos[i]= asf_st->packet_pos + 1;
934
935             if(pkt->stream_index == stream_index)
936                break;
937         }
938     }
939
940     *ppos= pos;
941 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
942
943     return pts;
944 }
945
946 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
947 {
948     GUID g;
949     ASFContext *asf = s->priv_data;
950     int64_t gsize, itime;
951     int64_t pos, current_pos, index_pts;
952     int i;
953     int pct,ict;
954
955     current_pos = url_ftell(&s->pb);
956
957     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
958     get_guid(&s->pb, &g);
959     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
960         gsize = get_le64(&s->pb);
961         get_guid(&s->pb, &g);
962         itime=get_le64(&s->pb);
963         pct=get_le32(&s->pb);
964         ict=get_le32(&s->pb);
965         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
966
967         for (i=0;i<ict;i++){
968             int pktnum=get_le32(&s->pb);
969             int pktct =get_le16(&s->pb);
970             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
971
972             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
973             index_pts=av_rescale(itime, i, 10000);
974
975             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
976         }
977         asf->index_read= 1;
978     }
979     url_fseek(&s->pb, current_pos, SEEK_SET);
980 }
981
982 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
983 {
984     ASFContext *asf = s->priv_data;
985     AVStream *st = s->streams[stream_index];
986     int64_t pos;
987     int index;
988
989     if (asf->packet_size <= 0)
990         return -1;
991
992     if (!asf->index_read)
993         asf_build_simple_index(s, stream_index);
994
995     if(!(asf->index_read && st->index_entries)){
996         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
997             return -1;
998     }else{
999         index= av_index_search_timestamp(st, pts, flags);
1000         if(index<0)
1001             return -1;
1002
1003         /* find the position */
1004         pos = st->index_entries[index].pos;
1005         pts = st->index_entries[index].timestamp;
1006
1007     // various attempts to find key frame have failed so far
1008     //    asf_reset_header(s);
1009     //    url_fseek(&s->pb, pos, SEEK_SET);
1010     //    key_pos = pos;
1011     //     for(i=0;i<16;i++){
1012     //         pos = url_ftell(&s->pb);
1013     //         if (av_read_frame(s, &pkt) < 0){
1014     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1015     //             return -1;
1016     //         }
1017     //         asf_st = s->streams[stream_index]->priv_data;
1018     //         pos += st->parser->frame_offset;
1019     //
1020     //         if (pkt.size > b) {
1021     //             b = pkt.size;
1022     //             key_pos = pos;
1023     //         }
1024     //
1025     //         av_free_packet(&pkt);
1026     //     }
1027
1028         /* do the seek */
1029         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1030         url_fseek(&s->pb, pos, SEEK_SET);
1031     }
1032     asf_reset_header(s);
1033     return 0;
1034 }
1035
1036 AVInputFormat asf_demuxer = {
1037     "asf",
1038     "asf format",
1039     sizeof(ASFContext),
1040     asf_probe,
1041     asf_read_header,
1042     asf_read_packet,
1043     asf_read_close,
1044     asf_read_seek,
1045     asf_read_pts,
1046 };