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