10l, fails to compile when debug enabled
[ffmpeg.git] / libavformat / asf.c
1 /*
2  * ASF compatible decoder.
3  * Copyright (c) 2000, 2001 Fabrice Bellard.
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 #include "avformat.h"
20 #include "avi.h"
21 #include "mpegaudio.h"
22 #include "asf.h"
23
24 #undef NDEBUG
25 #include <assert.h>
26
27 #define FRAME_HEADER_SIZE 17
28 // Fix Me! FRAME_HEADER_SIZE may be different.
29
30 static const GUID index_guid = {
31     0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
32 };
33
34 /**********************************/
35 /* decoding */
36
37 //#define DEBUG
38
39 #ifdef DEBUG
40 #define PRINT_IF_GUID(g,cmp) \
41 if (!memcmp(g, &cmp, sizeof(GUID))) \
42     printf("(GUID: %s) ", #cmp)
43
44 static void print_guid(const GUID *g)
45 {
46     int i;
47     PRINT_IF_GUID(g, asf_header);
48     else PRINT_IF_GUID(g, file_header);
49     else PRINT_IF_GUID(g, stream_header);
50     else PRINT_IF_GUID(g, audio_stream);
51     else PRINT_IF_GUID(g, audio_conceal_none);
52     else PRINT_IF_GUID(g, video_stream);
53     else PRINT_IF_GUID(g, video_conceal_none);
54     else PRINT_IF_GUID(g, command_stream);
55     else PRINT_IF_GUID(g, comment_header);
56     else PRINT_IF_GUID(g, codec_comment_header);
57     else PRINT_IF_GUID(g, codec_comment1_header);
58     else PRINT_IF_GUID(g, data_header);
59     else PRINT_IF_GUID(g, index_guid);
60     else PRINT_IF_GUID(g, head1_guid);
61     else PRINT_IF_GUID(g, head2_guid);
62     else PRINT_IF_GUID(g, my_guid);
63     else PRINT_IF_GUID(g, ext_stream_header);
64     else PRINT_IF_GUID(g, extended_content_header);
65     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
66     else PRINT_IF_GUID(g, ext_stream_audio_stream);
67     else
68         printf("(GUID: unknown) ");
69     printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
70     for(i=0;i<8;i++)
71         printf(" 0x%02x,", g->v4[i]);
72     printf("}\n");
73 }
74 #undef PRINT_IF_GUID
75 #endif
76
77 static void get_guid(ByteIOContext *s, GUID *g)
78 {
79     int i;
80
81     g->v1 = get_le32(s);
82     g->v2 = get_le16(s);
83     g->v3 = get_le16(s);
84     for(i=0;i<8;i++)
85         g->v4[i] = get_byte(s);
86 }
87
88 #if 0
89 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
90 {
91     int len, c;
92     char *q;
93
94     len = get_le16(pb);
95     q = buf;
96     while (len > 0) {
97         c = get_le16(pb);
98         if ((q - buf) < buf_size - 1)
99             *q++ = c;
100         len--;
101     }
102     *q = '\0';
103 }
104 #endif
105
106 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
107 {
108     int c;
109     char *q;
110
111     q = buf;
112     while (len > 0) {
113         c = get_le16(pb);
114         if ((q - buf) < buf_size - 1)
115             *q++ = c;
116         len-=2;
117     }
118     *q = '\0';
119 }
120
121 static int asf_probe(AVProbeData *pd)
122 {
123     GUID g;
124     const unsigned char *p;
125     int i;
126
127     /* check file header */
128     if (pd->buf_size <= 32)
129         return 0;
130     p = pd->buf;
131     g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
132     p += 4;
133     g.v2 = p[0] | (p[1] << 8);
134     p += 2;
135     g.v3 = p[0] | (p[1] << 8);
136     p += 2;
137     for(i=0;i<8;i++)
138         g.v4[i] = *p++;
139
140     if (!memcmp(&g, &asf_header, sizeof(GUID)))
141         return AVPROBE_SCORE_MAX;
142     else
143         return 0;
144 }
145
146 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
147 {
148     ASFContext *asf = s->priv_data;
149     GUID g;
150     ByteIOContext *pb = &s->pb;
151     AVStream *st;
152     ASFStream *asf_st;
153     int size, i;
154     int64_t gsize;
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("%08Lx: ", url_ftell(pb) - 24);
169         print_guid(&g);
170         printf("  size=0x%Lx\n", gsize);
171 #endif
172         if (gsize < 24)
173             goto fail;
174         if (!memcmp(&g, &file_header, sizeof(GUID))) {
175             get_guid(pb, &asf->hdr.guid);
176             asf->hdr.file_size          = get_le64(pb);
177             asf->hdr.create_time        = get_le64(pb);
178             asf->hdr.packets_count      = get_le64(pb);
179             asf->hdr.send_time          = get_le64(pb);
180             asf->hdr.play_time          = get_le64(pb);
181             asf->hdr.preroll            = get_le32(pb);
182             asf->hdr.ignore             = get_le32(pb);
183             asf->hdr.flags              = get_le32(pb);
184             asf->hdr.min_pktsize        = get_le32(pb);
185             asf->hdr.max_pktsize        = get_le32(pb);
186             asf->hdr.max_bitrate        = get_le32(pb);
187             asf->packet_size = asf->hdr.max_pktsize;
188             asf->nb_packets = asf->hdr.packets_count;
189         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
190             int type, total_size, type_specific_size, sizeX;
191             unsigned int tag1;
192             int64_t pos1, pos2;
193             int test_for_ext_stream_audio;
194
195             pos1 = url_ftell(pb);
196
197             st = av_new_stream(s, 0);
198             if (!st)
199                 goto fail;
200             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
201             asf_st = av_mallocz(sizeof(ASFStream));
202             if (!asf_st)
203                 goto fail;
204             st->priv_data = asf_st;
205             st->start_time = asf->hdr.preroll;
206             st->duration = asf->hdr.send_time /
207                 (10000000 / 1000) - st->start_time;
208             get_guid(pb, &g);
209
210             test_for_ext_stream_audio = 0;
211             if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
212                 type = CODEC_TYPE_AUDIO;
213             } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
214                 type = CODEC_TYPE_VIDEO;
215             } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
216                 type = CODEC_TYPE_UNKNOWN;
217             } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
218                 test_for_ext_stream_audio = 1;
219                 type = CODEC_TYPE_UNKNOWN;
220             } else {
221                 goto fail;
222             }
223             get_guid(pb, &g);
224             total_size = get_le64(pb);
225             type_specific_size = get_le32(pb);
226             get_le32(pb);
227             st->id = get_le16(pb) & 0x7f; /* stream id */
228             // mapping of asf ID to AV stream ID;
229             asf->asfid2avid[st->id] = s->nb_streams - 1;
230
231             get_le32(pb);
232
233             if (test_for_ext_stream_audio) {
234                 get_guid(pb, &g);
235                 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
236                     type = CODEC_TYPE_AUDIO;
237                     get_guid(pb, &g);
238                     get_le32(pb);
239                     get_le32(pb);
240                     get_le32(pb);
241                     get_guid(pb, &g);
242                     get_le32(pb);
243                 }
244             }
245
246             st->codec->codec_type = type;
247             if (type == CODEC_TYPE_AUDIO) {
248                 get_wav_header(pb, st->codec, type_specific_size);
249                 st->need_parsing = 1;
250                 /* We have to init the frame size at some point .... */
251                 pos2 = url_ftell(pb);
252                 if (gsize > (pos2 + 8 - pos1 + 24)) {
253                     asf_st->ds_span = get_byte(pb);
254                     asf_st->ds_packet_size = get_le16(pb);
255                     asf_st->ds_chunk_size = get_le16(pb);
256                     asf_st->ds_data_size = get_le16(pb);
257                     asf_st->ds_silence_data = get_byte(pb);
258                 }
259                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
260                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
261                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
262                 if (asf_st->ds_span > 1) {
263                     if (!asf_st->ds_chunk_size
264                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
265                         asf_st->ds_span = 0; // disable descrambling
266                 }
267                 switch (st->codec->codec_id) {
268                 case CODEC_ID_MP3:
269                     st->codec->frame_size = MPA_FRAME_SIZE;
270                     break;
271                 case CODEC_ID_PCM_S16LE:
272                 case CODEC_ID_PCM_S16BE:
273                 case CODEC_ID_PCM_U16LE:
274                 case CODEC_ID_PCM_U16BE:
275                 case CODEC_ID_PCM_S8:
276                 case CODEC_ID_PCM_U8:
277                 case CODEC_ID_PCM_ALAW:
278                 case CODEC_ID_PCM_MULAW:
279                     st->codec->frame_size = 1;
280                     break;
281                 default:
282                     /* This is probably wrong, but it prevents a crash later */
283                     st->codec->frame_size = 1;
284                     break;
285                 }
286             } else if (type == CODEC_TYPE_VIDEO) {
287                 get_le32(pb);
288                 get_le32(pb);
289                 get_byte(pb);
290                 size = get_le16(pb); /* size */
291                 sizeX= get_le32(pb); /* size */
292                 st->codec->width = get_le32(pb);
293                 st->codec->height = get_le32(pb);
294                 /* not available for asf */
295                 get_le16(pb); /* panes */
296                 st->codec->bits_per_sample = get_le16(pb); /* depth */
297                 tag1 = get_le32(pb);
298                 url_fskip(pb, 20);
299 //                av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
300                 size= sizeX;
301                 if (size > 40) {
302                     st->codec->extradata_size = size - 40;
303                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
304                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
305                 }
306
307         /* Extract palette from extradata if bpp <= 8 */
308         /* This code assumes that extradata contains only palette */
309         /* This is true for all paletted codecs implemented in ffmpeg */
310         if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
311             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
312 #ifdef WORDS_BIGENDIAN
313             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
314                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
315 #else
316             memcpy(st->codec->palctrl->palette, st->codec->extradata,
317                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
318 #endif
319             st->codec->palctrl->palette_changed = 1;
320         }
321
322                 st->codec->codec_tag = tag1;
323                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
324                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
325                     st->need_parsing = 1;
326             }
327             pos2 = url_ftell(pb);
328             url_fskip(pb, gsize - (pos2 - pos1 + 24));
329         } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
330             break;
331         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
332             int len1, len2, len3, len4, len5;
333
334             len1 = get_le16(pb);
335             len2 = get_le16(pb);
336             len3 = get_le16(pb);
337             len4 = get_le16(pb);
338             len5 = get_le16(pb);
339             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
340             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
341             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
342             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
343             url_fskip(pb, len5);
344        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
345                 int desc_count, i;
346
347                 desc_count = get_le16(pb);
348                 for(i=0;i<desc_count;i++)
349                 {
350                         int name_len,value_type,value_len,value_num = 0;
351                         char *name, *value;
352
353                         name_len = get_le16(pb);
354                         name = (char *)av_mallocz(name_len);
355                         get_str16_nolen(pb, name_len, name, name_len);
356                         value_type = get_le16(pb);
357                         value_len = get_le16(pb);
358                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
359                         {
360                                 value = (char *)av_mallocz(value_len);
361                                 get_str16_nolen(pb, value_len, value, value_len);
362                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
363                                 av_free(value);
364                         }
365                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
366                         {
367                                 if (value_type==2) value_num = get_le32(pb);
368                                 if (value_type==3) value_num = get_le32(pb);
369                                 if (value_type==4) value_num = get_le64(pb);
370                                 if (value_type==5) value_num = get_le16(pb);
371                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
372                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
373                         }
374                         av_free(name);
375                 }
376         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
377             int ext_len, payload_ext_ct, stream_ct;
378             uint32_t ext_d;
379             int64_t pos_ex_st, pos_curr;
380             pos_ex_st = url_ftell(pb);
381
382             get_le64(pb);
383             get_le64(pb);
384             get_le32(pb);
385             get_le32(pb);
386             get_le32(pb);
387             get_le32(pb);
388             get_le32(pb);
389             get_le32(pb);
390             get_le32(pb);
391             get_le32(pb);
392             get_le16(pb);
393             get_le16(pb);
394             get_le64(pb);
395             stream_ct = get_le16(pb);
396             payload_ext_ct = get_le16(pb);
397
398             for (i=0; i<stream_ct; i++){
399                 get_le16(pb);
400                 ext_len = get_le16(pb);
401                 url_fseek(pb, ext_len, SEEK_CUR);
402             }
403
404             for (i=0; i<payload_ext_ct; i++){
405                 get_guid(pb, &g);
406                 ext_d=get_le16(pb);
407                 ext_len=get_le32(pb);
408                 url_fseek(pb, ext_len, SEEK_CUR);
409             }
410
411             // there could be a optional stream properties object to follow
412             // if so the next iteration will pick it up
413         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
414             int v1, v2;
415             get_guid(pb, &g);
416             v1 = get_le32(pb);
417             v2 = get_le16(pb);
418 #if 0
419         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
420             int len, v1, n, num;
421             char str[256], *q;
422             char tag[16];
423
424             get_guid(pb, &g);
425             print_guid(&g);
426
427             n = get_le32(pb);
428             for(i=0;i<n;i++) {
429                 num = get_le16(pb); /* stream number */
430                 get_str16(pb, str, sizeof(str));
431                 get_str16(pb, str, sizeof(str));
432                 len = get_le16(pb);
433                 q = tag;
434                 while (len > 0) {
435                     v1 = get_byte(pb);
436                     if ((q - tag) < sizeof(tag) - 1)
437                         *q++ = v1;
438                     len--;
439                 }
440                 *q = '\0';
441             }
442 #endif
443         } else if (url_feof(pb)) {
444             goto fail;
445         } else {
446             url_fseek(pb, gsize - 24, SEEK_CUR);
447         }
448     }
449     get_guid(pb, &g);
450     get_le64(pb);
451     get_byte(pb);
452     get_byte(pb);
453     if (url_feof(pb))
454         goto fail;
455     asf->data_offset = url_ftell(pb);
456     asf->packet_size_left = 0;
457
458     return 0;
459
460  fail:
461      for(i=0;i<s->nb_streams;i++) {
462         AVStream *st = s->streams[i];
463         if (st) {
464             av_free(st->priv_data);
465             av_free(st->codec->extradata);
466         }
467         av_free(st);
468     }
469     return -1;
470 }
471
472 #define DO_2BITS(bits, var, defval) \
473     switch (bits & 3) \
474     { \
475     case 3: var = get_le32(pb); rsize += 4; break; \
476     case 2: var = get_le16(pb); rsize += 2; break; \
477     case 1: var = get_byte(pb); rsize++; break; \
478     default: var = defval; break; \
479     }
480
481 static int asf_get_packet(AVFormatContext *s)
482 {
483     ASFContext *asf = s->priv_data;
484     ByteIOContext *pb = &s->pb;
485     uint32_t packet_length, padsize;
486     int rsize = 9;
487     int c;
488
489     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
490
491     c = get_byte(pb);
492     if (c != 0x82) {
493         if (!url_feof(pb))
494             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
495     }
496     if ((c & 0x0f) == 2) { // always true for now
497         if (get_le16(pb) != 0) {
498             if (!url_feof(pb))
499                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
500             return AVERROR_IO;
501         }
502         rsize+=2;
503 /*    }else{
504         if (!url_feof(pb))
505             printf("ff asf bad header %x  at:%lld\n", c, url_ftell(pb));
506         return AVERROR_IO;*/
507     }
508
509     asf->packet_flags = get_byte(pb);
510     asf->packet_property = get_byte(pb);
511
512     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
513     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
514     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
515
516     asf->packet_timestamp = get_le32(pb);
517     get_le16(pb); /* duration */
518     // rsize has at least 11 bytes which have to be present
519
520     if (asf->packet_flags & 0x01) {
521         asf->packet_segsizetype = get_byte(pb); rsize++;
522         asf->packet_segments = asf->packet_segsizetype & 0x3f;
523     } else {
524         asf->packet_segments = 1;
525         asf->packet_segsizetype = 0x80;
526     }
527     asf->packet_size_left = packet_length - padsize - rsize;
528     if (packet_length < asf->hdr.min_pktsize)
529         padsize += asf->hdr.min_pktsize - packet_length;
530     asf->packet_padsize = padsize;
531 #ifdef DEBUG
532     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
533 #endif
534     return 0;
535 }
536
537 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
538 {
539     ASFContext *asf = s->priv_data;
540     ASFStream *asf_st = 0;
541     ByteIOContext *pb = &s->pb;
542     //static int pc = 0;
543     for (;;) {
544         int rsize = 0;
545         if (asf->packet_size_left < FRAME_HEADER_SIZE
546             || asf->packet_segments < 1) {
547             //asf->packet_size_left <= asf->packet_padsize) {
548             int ret = asf->packet_size_left + asf->packet_padsize;
549             //printf("PacketLeftSize:%d  Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
550             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
551                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
552             /* fail safe */
553             url_fskip(pb, ret);
554             asf->packet_pos= url_ftell(&s->pb);
555             ret = asf_get_packet(s);
556             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
557             if (ret < 0 || url_feof(pb))
558                 return AVERROR_IO;
559             asf->packet_time_start = 0;
560             continue;
561         }
562         if (asf->packet_time_start == 0) {
563             /* read frame header */
564             int num = get_byte(pb);
565             asf->packet_segments--;
566             rsize++;
567             asf->packet_key_frame = (num & 0x80) >> 7;
568             asf->stream_index = asf->asfid2avid[num & 0x7f];
569             // sequence should be ignored!
570             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
571             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
572             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
573 //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);
574             if (asf->packet_replic_size > 1) {
575                 assert(asf->packet_replic_size >= 8);
576                 // it should be always at least 8 bytes - FIXME validate
577                 asf->packet_obj_size = get_le32(pb);
578                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
579                 if (asf->packet_replic_size > 8)
580                     url_fskip(pb, asf->packet_replic_size - 8);
581                 rsize += asf->packet_replic_size; // FIXME - check validity
582             } else if (asf->packet_replic_size==1){
583                 // multipacket - frag_offset is begining timestamp
584                 asf->packet_time_start = asf->packet_frag_offset;
585                 asf->packet_frag_offset = 0;
586                 asf->packet_frag_timestamp = asf->packet_timestamp;
587
588                 asf->packet_time_delta = get_byte(pb);
589                 rsize++;
590             }else{
591                 assert(asf->packet_replic_size==0);
592             }
593             if (asf->packet_flags & 0x01) {
594                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
595 #undef DO_2BITS
596                 //printf("Fragsize %d\n", asf->packet_frag_size);
597             } else {
598                 asf->packet_frag_size = asf->packet_size_left - rsize;
599                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
600             }
601             if (asf->packet_replic_size == 1) {
602                 asf->packet_multi_size = asf->packet_frag_size;
603                 if (asf->packet_multi_size > asf->packet_size_left) {
604                     asf->packet_segments = 0;
605                     continue;
606                 }
607             }
608             asf->packet_size_left -= rsize;
609             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
610
611             if (asf->stream_index < 0
612                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
613                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
614                 ) {
615                 asf->packet_time_start = 0;
616                 /* unhandled packet (should not happen) */
617                 url_fskip(pb, asf->packet_frag_size);
618                 asf->packet_size_left -= asf->packet_frag_size;
619                 if(asf->stream_index < 0)
620                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
621                 continue;
622             }
623             asf->asf_st = s->streams[asf->stream_index]->priv_data;
624         }
625         asf_st = asf->asf_st;
626
627         if ((asf->packet_frag_offset != asf_st->frag_offset
628              || (asf->packet_frag_offset
629                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
630            ) {
631             /* cannot continue current packet: free it */
632             // FIXME better check if packet was already allocated
633             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
634                    asf_st->pkt.size,
635                    asf->packet_obj_size,
636                    asf->packet_frag_offset, asf_st->frag_offset,
637                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
638             if (asf_st->pkt.size)
639                 av_free_packet(&asf_st->pkt);
640             asf_st->frag_offset = 0;
641             if (asf->packet_frag_offset != 0) {
642                 url_fskip(pb, asf->packet_frag_size);
643                 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
644                 asf->packet_size_left -= asf->packet_frag_size;
645                 continue;
646             }
647         }
648         if (asf->packet_replic_size == 1) {
649             // frag_offset is here used as the begining timestamp
650             asf->packet_frag_timestamp = asf->packet_time_start;
651             asf->packet_time_start += asf->packet_time_delta;
652             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
653             asf->packet_size_left--;
654             asf->packet_multi_size--;
655             if (asf->packet_multi_size < asf->packet_obj_size)
656             {
657                 asf->packet_time_start = 0;
658                 url_fskip(pb, asf->packet_multi_size);
659                 asf->packet_size_left -= asf->packet_multi_size;
660                 continue;
661             }
662             asf->packet_multi_size -= asf->packet_obj_size;
663             //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);
664         }
665         if (asf_st->frag_offset == 0) {
666             /* new packet */
667             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
668             asf_st->seq = asf->packet_seq;
669             asf_st->pkt.pts = asf->packet_frag_timestamp;
670             asf_st->pkt.stream_index = asf->stream_index;
671             asf_st->pkt.pos =
672             asf_st->packet_pos= asf->packet_pos;
673 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
674 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
675 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
676             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
677                 asf->packet_key_frame = 1;
678             if (asf->packet_key_frame)
679                 asf_st->pkt.flags |= PKT_FLAG_KEY;
680         }
681
682         /* read data */
683         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
684         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
685         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
686         asf->packet_size_left -= asf->packet_frag_size;
687         if (asf->packet_size_left < 0)
688             continue;
689         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
690                    asf->packet_frag_size);
691         asf_st->frag_offset += asf->packet_frag_size;
692         /* test if whole packet is read */
693         if (asf_st->frag_offset == asf_st->pkt.size) {
694             /* return packet */
695             if (asf_st->ds_span > 1) {
696                 /* packet descrambling */
697                 char* newdata = av_malloc(asf_st->pkt.size);
698                 if (newdata) {
699                     int offset = 0;
700                     while (offset < asf_st->pkt.size) {
701                         int off = offset / asf_st->ds_chunk_size;
702                         int row = off / asf_st->ds_span;
703                         int col = off % asf_st->ds_span;
704                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
705                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
706                         memcpy(newdata + offset,
707                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
708                                asf_st->ds_chunk_size);
709                         offset += asf_st->ds_chunk_size;
710                     }
711                     av_free(asf_st->pkt.data);
712                     asf_st->pkt.data = newdata;
713                 }
714             }
715             asf_st->frag_offset = 0;
716             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
717             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
718             asf_st->pkt.size = 0;
719             asf_st->pkt.data = 0;
720             break; // packet completed
721         }
722     }
723     return 0;
724 }
725
726 static int asf_read_close(AVFormatContext *s)
727 {
728     int i;
729
730     for(i=0;i<s->nb_streams;i++) {
731         AVStream *st = s->streams[i];
732         av_free(st->priv_data);
733         av_free(st->codec->extradata);
734     av_free(st->codec->palctrl);
735     }
736     return 0;
737 }
738
739 // Added to support seeking after packets have been read
740 // If information is not reset, read_packet fails due to
741 // leftover information from previous reads
742 static void asf_reset_header(AVFormatContext *s)
743 {
744     ASFContext *asf = s->priv_data;
745     ASFStream *asf_st;
746     int i;
747
748     asf->packet_nb_frames = 0;
749     asf->packet_timestamp_start = -1;
750     asf->packet_timestamp_end = -1;
751     asf->packet_size_left = 0;
752     asf->packet_segments = 0;
753     asf->packet_flags = 0;
754     asf->packet_property = 0;
755     asf->packet_timestamp = 0;
756     asf->packet_segsizetype = 0;
757     asf->packet_segments = 0;
758     asf->packet_seq = 0;
759     asf->packet_replic_size = 0;
760     asf->packet_key_frame = 0;
761     asf->packet_padsize = 0;
762     asf->packet_frag_offset = 0;
763     asf->packet_frag_size = 0;
764     asf->packet_frag_timestamp = 0;
765     asf->packet_multi_size = 0;
766     asf->packet_obj_size = 0;
767     asf->packet_time_delta = 0;
768     asf->packet_time_start = 0;
769
770     for(i=0; i<s->nb_streams; i++){
771         asf_st= s->streams[i]->priv_data;
772         av_free_packet(&asf_st->pkt);
773         asf_st->frag_offset=0;
774         asf_st->seq=0;
775     }
776     asf->asf_st= NULL;
777 }
778
779 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
780 {
781     ASFContext *asf = s->priv_data;
782     AVPacket pkt1, *pkt = &pkt1;
783     ASFStream *asf_st;
784     int64_t pts;
785     int64_t pos= *ppos;
786     int i;
787     int64_t start_pos[s->nb_streams];
788
789     for(i=0; i<s->nb_streams; i++){
790         start_pos[i]= pos;
791     }
792
793     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
794     *ppos= pos;
795     url_fseek(&s->pb, pos, SEEK_SET);
796
797 //printf("asf_read_pts\n");
798     asf_reset_header(s);
799     for(;;){
800         if (av_read_frame(s, pkt) < 0){
801             av_log(s, AV_LOG_INFO, "seek failed\n");
802             return AV_NOPTS_VALUE;
803         }
804
805         pts= pkt->pts * 1000 / AV_TIME_BASE;
806
807         av_free_packet(pkt);
808         if(pkt->flags&PKT_FLAG_KEY){
809             i= pkt->stream_index;
810
811             asf_st= s->streams[i]->priv_data;
812
813             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
814             pos= asf_st->packet_pos;
815
816             av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
817             start_pos[i]= asf_st->packet_pos + 1;
818
819             if(pkt->stream_index == stream_index)
820                break;
821         }
822     }
823
824     *ppos= pos;
825 //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
826
827     return pts;
828 }
829
830 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
831 {
832     ASFContext *asf = s->priv_data;
833
834     if (asf->packet_size <= 0)
835         return -1;
836
837     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
838         return -1;
839
840     asf_reset_header(s);
841     return 0;
842 }
843
844 static AVInputFormat asf_iformat = {
845     "asf",
846     "asf format",
847     sizeof(ASFContext),
848     asf_probe,
849     asf_read_header,
850     asf_read_packet,
851     asf_read_close,
852     asf_read_seek,
853     asf_read_pts,
854 };
855
856 #ifdef CONFIG_MUXERS
857     extern AVOutputFormat asf_oformat;
858     extern AVOutputFormat asf_stream_oformat;
859 #endif //CONFIG_MUXERS
860
861 int asf_init(void)
862 {
863     av_register_input_format(&asf_iformat);
864 #ifdef CONFIG_MUXERS
865     av_register_output_format(&asf_oformat);
866     av_register_output_format(&asf_stream_oformat);
867 #endif //CONFIG_MUXERS
868     return 0;
869 }