f63e4b695947b109a3287ad5ccae30c862849d7e
[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     0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
35 };
36
37 /**********************************/
38 /* decoding */
39
40 //#define DEBUG
41
42 #ifdef DEBUG
43 #define PRINT_IF_GUID(g,cmp) \
44 if (!memcmp(g, &cmp, sizeof(GUID))) \
45     printf("(GUID: %s) ", #cmp)
46
47 static void print_guid(const GUID *g)
48 {
49     int i;
50     PRINT_IF_GUID(g, asf_header);
51     else PRINT_IF_GUID(g, file_header);
52     else PRINT_IF_GUID(g, stream_header);
53     else PRINT_IF_GUID(g, audio_stream);
54     else PRINT_IF_GUID(g, audio_conceal_none);
55     else PRINT_IF_GUID(g, video_stream);
56     else PRINT_IF_GUID(g, video_conceal_none);
57     else PRINT_IF_GUID(g, command_stream);
58     else PRINT_IF_GUID(g, comment_header);
59     else PRINT_IF_GUID(g, codec_comment_header);
60     else PRINT_IF_GUID(g, codec_comment1_header);
61     else PRINT_IF_GUID(g, data_header);
62     else PRINT_IF_GUID(g, index_guid);
63     else PRINT_IF_GUID(g, head1_guid);
64     else PRINT_IF_GUID(g, head2_guid);
65     else PRINT_IF_GUID(g, my_guid);
66     else PRINT_IF_GUID(g, ext_stream_header);
67     else PRINT_IF_GUID(g, extended_content_header);
68     else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
69     else PRINT_IF_GUID(g, ext_stream_audio_stream);
70     else
71         printf("(GUID: unknown) ");
72     printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
73     for(i=0;i<8;i++)
74         printf(" 0x%02x,", g->v4[i]);
75     printf("}\n");
76 }
77 #undef PRINT_IF_GUID
78 #endif
79
80 static void get_guid(ByteIOContext *s, GUID *g)
81 {
82     int i;
83
84     g->v1 = get_le32(s);
85     g->v2 = get_le16(s);
86     g->v3 = get_le16(s);
87     for(i=0;i<8;i++)
88         g->v4[i] = get_byte(s);
89 }
90
91 #if 0
92 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
93 {
94     int len, c;
95     char *q;
96
97     len = get_le16(pb);
98     q = buf;
99     while (len > 0) {
100         c = get_le16(pb);
101         if ((q - buf) < buf_size - 1)
102             *q++ = c;
103         len--;
104     }
105     *q = '\0';
106 }
107 #endif
108
109 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
110 {
111     char* q = buf;
112     len /= 2;
113     while (len--) {
114         uint8_t tmp;
115         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
116     }
117     *q = '\0';
118 }
119
120 static int asf_probe(AVProbeData *pd)
121 {
122     GUID g;
123     const unsigned char *p;
124     int i;
125
126     /* check file header */
127     if (pd->buf_size <= 32)
128         return 0;
129     p = pd->buf;
130     g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
131     p += 4;
132     g.v2 = p[0] | (p[1] << 8);
133     p += 2;
134     g.v3 = p[0] | (p[1] << 8);
135     p += 2;
136     for(i=0;i<8;i++)
137         g.v4[i] = *p++;
138
139     if (!memcmp(&g, &asf_header, sizeof(GUID)))
140         return AVPROBE_SCORE_MAX;
141     else
142         return 0;
143 }
144
145 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
146 {
147     ASFContext *asf = s->priv_data;
148     GUID g;
149     ByteIOContext *pb = &s->pb;
150     AVStream *st;
151     ASFStream *asf_st;
152     int size, i;
153     int64_t gsize;
154
155     get_guid(pb, &g);
156     if (memcmp(&g, &asf_header, sizeof(GUID)))
157         goto fail;
158     get_le64(pb);
159     get_le32(pb);
160     get_byte(pb);
161     get_byte(pb);
162     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
163     for(;;) {
164         get_guid(pb, &g);
165         gsize = get_le64(pb);
166 #ifdef DEBUG
167         printf("%08"PRIx64": ", url_ftell(pb) - 24);
168         print_guid(&g);
169         printf("  size=0x%"PRIx64"\n", gsize);
170 #endif
171         if (gsize < 24)
172             goto fail;
173         if (!memcmp(&g, &file_header, sizeof(GUID))) {
174             get_guid(pb, &asf->hdr.guid);
175             asf->hdr.file_size          = get_le64(pb);
176             asf->hdr.create_time        = get_le64(pb);
177             asf->hdr.packets_count      = get_le64(pb);
178             asf->hdr.send_time          = get_le64(pb);
179             asf->hdr.play_time          = get_le64(pb);
180             asf->hdr.preroll            = get_le32(pb);
181             asf->hdr.ignore             = get_le32(pb);
182             asf->hdr.flags              = get_le32(pb);
183             asf->hdr.min_pktsize        = get_le32(pb);
184             asf->hdr.max_pktsize        = get_le32(pb);
185             asf->hdr.max_bitrate        = get_le32(pb);
186             asf->packet_size = asf->hdr.max_pktsize;
187             asf->nb_packets = asf->hdr.packets_count;
188         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
189             int type, type_specific_size, sizeX;
190             uint64_t total_size;
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             asf->data_object_offset = url_ftell(pb);
331             if (gsize != (uint64_t)-1 && gsize >= 24) {
332                 asf->data_object_size = gsize - 24;
333             } else {
334                 asf->data_object_size = (uint64_t)-1;
335             }
336             break;
337         } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
338             int len1, len2, len3, len4, len5;
339
340             len1 = get_le16(pb);
341             len2 = get_le16(pb);
342             len3 = get_le16(pb);
343             len4 = get_le16(pb);
344             len5 = get_le16(pb);
345             get_str16_nolen(pb, len1, s->title, sizeof(s->title));
346             get_str16_nolen(pb, len2, s->author, sizeof(s->author));
347             get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
348             get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
349             url_fskip(pb, len5);
350        } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
351                 int desc_count, i;
352
353                 desc_count = get_le16(pb);
354                 for(i=0;i<desc_count;i++)
355                 {
356                         int name_len,value_type,value_len;
357                         uint64_t value_num = 0;
358                         char *name, *value;
359
360                         name_len = get_le16(pb);
361                         name = (char *)av_malloc(name_len * 2);
362                         get_str16_nolen(pb, name_len, name, name_len * 2);
363                         value_type = get_le16(pb);
364                         value_len = get_le16(pb);
365                         if ((value_type == 0) || (value_type == 1)) // unicode or byte
366                         {
367                                 value = (char *)av_malloc(value_len * 2);
368                                 get_str16_nolen(pb, value_len, value,
369                                         value_len * 2);
370                                 if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
371                                 av_free(value);
372                         }
373                         if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
374                         {
375                                 if (value_type==2) value_num = get_le32(pb);
376                                 if (value_type==3) value_num = get_le32(pb);
377                                 if (value_type==4) value_num = get_le64(pb);
378                                 if (value_type==5) value_num = get_le16(pb);
379                                 if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
380                                 if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
381                         }
382                         av_free(name);
383                 }
384         } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
385             int ext_len, payload_ext_ct, stream_ct;
386             uint32_t ext_d;
387             int64_t pos_ex_st;
388             pos_ex_st = url_ftell(pb);
389
390             get_le64(pb);
391             get_le64(pb);
392             get_le32(pb);
393             get_le32(pb);
394             get_le32(pb);
395             get_le32(pb);
396             get_le32(pb);
397             get_le32(pb);
398             get_le32(pb);
399             get_le32(pb);
400             get_le16(pb);
401             get_le16(pb);
402             get_le64(pb);
403             stream_ct = get_le16(pb);
404             payload_ext_ct = get_le16(pb);
405
406             for (i=0; i<stream_ct; i++){
407                 get_le16(pb);
408                 ext_len = get_le16(pb);
409                 url_fseek(pb, ext_len, SEEK_CUR);
410             }
411
412             for (i=0; i<payload_ext_ct; i++){
413                 get_guid(pb, &g);
414                 ext_d=get_le16(pb);
415                 ext_len=get_le32(pb);
416                 url_fseek(pb, ext_len, SEEK_CUR);
417             }
418
419             // there could be a optional stream properties object to follow
420             // if so the next iteration will pick it up
421         } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
422             int v1, v2;
423             get_guid(pb, &g);
424             v1 = get_le32(pb);
425             v2 = get_le16(pb);
426 #if 0
427         } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
428             int len, v1, n, num;
429             char str[256], *q;
430             char tag[16];
431
432             get_guid(pb, &g);
433             print_guid(&g);
434
435             n = get_le32(pb);
436             for(i=0;i<n;i++) {
437                 num = get_le16(pb); /* stream number */
438                 get_str16(pb, str, sizeof(str));
439                 get_str16(pb, str, sizeof(str));
440                 len = get_le16(pb);
441                 q = tag;
442                 while (len > 0) {
443                     v1 = get_byte(pb);
444                     if ((q - tag) < sizeof(tag) - 1)
445                         *q++ = v1;
446                     len--;
447                 }
448                 *q = '\0';
449             }
450 #endif
451         } else if (url_feof(pb)) {
452             goto fail;
453         } else {
454             url_fseek(pb, gsize - 24, SEEK_CUR);
455         }
456     }
457     get_guid(pb, &g);
458     get_le64(pb);
459     get_byte(pb);
460     get_byte(pb);
461     if (url_feof(pb))
462         goto fail;
463     asf->data_offset = url_ftell(pb);
464     asf->packet_size_left = 0;
465
466     return 0;
467
468  fail:
469      for(i=0;i<s->nb_streams;i++) {
470         AVStream *st = s->streams[i];
471         if (st) {
472             av_free(st->priv_data);
473             av_free(st->codec->extradata);
474         }
475         av_free(st);
476     }
477     return -1;
478 }
479
480 #define DO_2BITS(bits, var, defval) \
481     switch (bits & 3) \
482     { \
483     case 3: var = get_le32(pb); rsize += 4; break; \
484     case 2: var = get_le16(pb); rsize += 2; break; \
485     case 1: var = get_byte(pb); rsize++; break; \
486     default: var = defval; break; \
487     }
488
489 static int asf_get_packet(AVFormatContext *s)
490 {
491     ASFContext *asf = s->priv_data;
492     ByteIOContext *pb = &s->pb;
493     uint32_t packet_length, padsize;
494     int rsize = 9;
495     int c;
496
497     assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
498
499     c = get_byte(pb);
500     if (c != 0x82) {
501         if (!url_feof(pb))
502             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
503     }
504     if ((c & 0x0f) == 2) { // always true for now
505         if (get_le16(pb) != 0) {
506             if (!url_feof(pb))
507                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
508             return AVERROR_IO;
509         }
510         rsize+=2;
511 /*    }else{
512         if (!url_feof(pb))
513             printf("ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
514         return AVERROR_IO;*/
515     }
516
517     asf->packet_flags = get_byte(pb);
518     asf->packet_property = get_byte(pb);
519
520     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
521     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
522     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
523
524     //the following checks prevent overflows and infinite loops
525     if(packet_length >= (1U<<29)){
526         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
527         return 0; // FIXME this should be -1
528     }
529     if(padsize >= (1U<<29)){
530         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
531         return 0; // FIXME this should be -1
532     }
533
534     asf->packet_timestamp = get_le32(pb);
535     get_le16(pb); /* duration */
536     // rsize has at least 11 bytes which have to be present
537
538     if (asf->packet_flags & 0x01) {
539         asf->packet_segsizetype = get_byte(pb); rsize++;
540         asf->packet_segments = asf->packet_segsizetype & 0x3f;
541     } else {
542         asf->packet_segments = 1;
543         asf->packet_segsizetype = 0x80;
544     }
545     asf->packet_size_left = packet_length - padsize - rsize;
546     if (packet_length < asf->hdr.min_pktsize)
547         padsize += asf->hdr.min_pktsize - packet_length;
548     asf->packet_padsize = padsize;
549 #ifdef DEBUG
550     printf("packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
551 #endif
552     return 0;
553 }
554
555 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
556 {
557     ASFContext *asf = s->priv_data;
558     ASFStream *asf_st = 0;
559     ByteIOContext *pb = &s->pb;
560     //static int pc = 0;
561     for (;;) {
562         int rsize = 0;
563         if (asf->packet_size_left < FRAME_HEADER_SIZE
564             || asf->packet_segments < 1) {
565             //asf->packet_size_left <= asf->packet_padsize) {
566             int ret = asf->packet_size_left + asf->packet_padsize;
567             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
568             if((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size)
569                 ret += asf->packet_size - ((url_ftell(&s->pb) + ret - s->data_offset) % asf->packet_size);
570             assert(ret>=0);
571             /* fail safe */
572             url_fskip(pb, ret);
573             asf->packet_pos= url_ftell(&s->pb);
574             if (asf->data_object_size != (uint64_t)-1 &&
575                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
576                 return AVERROR_IO; /* Do not exceed the size of the data object */
577             ret = asf_get_packet(s);
578             //printf("READ ASF PACKET  %d   r:%d   c:%d\n", ret, asf->packet_size_left, pc++);
579             if (ret < 0 || url_feof(pb))
580                 return AVERROR_IO;
581             asf->packet_time_start = 0;
582             continue;
583         }
584         if (asf->packet_time_start == 0) {
585             /* read frame header */
586             int num = get_byte(pb);
587             asf->packet_segments--;
588             rsize++;
589             asf->packet_key_frame = (num & 0x80) >> 7;
590             asf->stream_index = asf->asfid2avid[num & 0x7f];
591             // sequence should be ignored!
592             DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
593             DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
594             DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
595 //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);
596             if (asf->packet_replic_size > 1) {
597                 assert(asf->packet_replic_size >= 8);
598                 // it should be always at least 8 bytes - FIXME validate
599                 asf->packet_obj_size = get_le32(pb);
600                 asf->packet_frag_timestamp = get_le32(pb); // timestamp
601                 if (asf->packet_replic_size > 8)
602                     url_fskip(pb, asf->packet_replic_size - 8);
603                 rsize += asf->packet_replic_size; // FIXME - check validity
604             } else if (asf->packet_replic_size==1){
605                 // multipacket - frag_offset is begining timestamp
606                 asf->packet_time_start = asf->packet_frag_offset;
607                 asf->packet_frag_offset = 0;
608                 asf->packet_frag_timestamp = asf->packet_timestamp;
609
610                 asf->packet_time_delta = get_byte(pb);
611                 rsize++;
612             }else{
613                 assert(asf->packet_replic_size==0);
614             }
615             if (asf->packet_flags & 0x01) {
616                 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
617 #undef DO_2BITS
618                 //printf("Fragsize %d\n", asf->packet_frag_size);
619             } else {
620                 asf->packet_frag_size = asf->packet_size_left - rsize;
621                 //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
622             }
623             if (asf->packet_replic_size == 1) {
624                 asf->packet_multi_size = asf->packet_frag_size;
625                 if (asf->packet_multi_size > asf->packet_size_left) {
626                     asf->packet_segments = 0;
627                     continue;
628                 }
629             }
630             asf->packet_size_left -= rsize;
631             //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
632
633             if (asf->stream_index < 0
634                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
635                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
636                 ) {
637                 asf->packet_time_start = 0;
638                 /* unhandled packet (should not happen) */
639                 url_fskip(pb, asf->packet_frag_size);
640                 asf->packet_size_left -= asf->packet_frag_size;
641                 if(asf->stream_index < 0)
642                     av_log(s, AV_LOG_ERROR, "ff asf skip %d  %d\n", asf->packet_frag_size, num & 0x7f);
643                 continue;
644             }
645             asf->asf_st = s->streams[asf->stream_index]->priv_data;
646         }
647         asf_st = asf->asf_st;
648
649         if ((asf->packet_frag_offset != asf_st->frag_offset
650              || (asf->packet_frag_offset
651                  && asf->packet_seq != asf_st->seq)) // seq should be ignored
652            ) {
653             /* cannot continue current packet: free it */
654             // FIXME better check if packet was already allocated
655             av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d     o:%d - %d    %d %d   fl:%d\n",
656                    asf_st->pkt.size,
657                    asf->packet_obj_size,
658                    asf->packet_frag_offset, asf_st->frag_offset,
659                    asf->packet_seq, asf_st->seq, asf->packet_frag_size);
660             if (asf_st->pkt.size)
661                 av_free_packet(&asf_st->pkt);
662             asf_st->frag_offset = 0;
663             if (asf->packet_frag_offset != 0) {
664                 url_fskip(pb, asf->packet_frag_size);
665                 av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
666                 asf->packet_size_left -= asf->packet_frag_size;
667                 continue;
668             }
669         }
670         if (asf->packet_replic_size == 1) {
671             // frag_offset is here used as the begining timestamp
672             asf->packet_frag_timestamp = asf->packet_time_start;
673             asf->packet_time_start += asf->packet_time_delta;
674             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
675             asf->packet_size_left--;
676             asf->packet_multi_size--;
677             if (asf->packet_multi_size < asf->packet_obj_size)
678             {
679                 asf->packet_time_start = 0;
680                 url_fskip(pb, asf->packet_multi_size);
681                 asf->packet_size_left -= asf->packet_multi_size;
682                 continue;
683             }
684             asf->packet_multi_size -= asf->packet_obj_size;
685             //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);
686         }
687         if (asf_st->frag_offset == 0) {
688             /* new packet */
689             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
690             asf_st->seq = asf->packet_seq;
691             asf_st->pkt.pts = asf->packet_frag_timestamp;
692             asf_st->pkt.stream_index = asf->stream_index;
693             asf_st->pkt.pos =
694             asf_st->packet_pos= asf->packet_pos;
695 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
696 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
697 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
698             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
699                 asf->packet_key_frame = 1;
700             if (asf->packet_key_frame)
701                 asf_st->pkt.flags |= PKT_FLAG_KEY;
702         }
703
704         /* read data */
705         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
706         //       asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
707         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
708         asf->packet_size_left -= asf->packet_frag_size;
709         if (asf->packet_size_left < 0)
710             continue;
711         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
712                    asf->packet_frag_size);
713         asf_st->frag_offset += asf->packet_frag_size;
714         /* test if whole packet is read */
715         if (asf_st->frag_offset == asf_st->pkt.size) {
716             /* return packet */
717             if (asf_st->ds_span > 1) {
718                 /* packet descrambling */
719                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
720                 if (newdata) {
721                     int offset = 0;
722                     while (offset < asf_st->pkt.size) {
723                         int off = offset / asf_st->ds_chunk_size;
724                         int row = off / asf_st->ds_span;
725                         int col = off % asf_st->ds_span;
726                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
727                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
728                         memcpy(newdata + offset,
729                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
730                                asf_st->ds_chunk_size);
731                         offset += asf_st->ds_chunk_size;
732                     }
733                     av_free(asf_st->pkt.data);
734                     asf_st->pkt.data = newdata;
735                 }
736             }
737             asf_st->frag_offset = 0;
738             memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
739             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
740             asf_st->pkt.size = 0;
741             asf_st->pkt.data = 0;
742             break; // packet completed
743         }
744     }
745     return 0;
746 }
747
748 static int asf_read_close(AVFormatContext *s)
749 {
750     int i;
751
752     for(i=0;i<s->nb_streams;i++) {
753         AVStream *st = s->streams[i];
754         av_free(st->priv_data);
755     av_free(st->codec->palctrl);
756     }
757     return 0;
758 }
759
760 // Added to support seeking after packets have been read
761 // If information is not reset, read_packet fails due to
762 // leftover information from previous reads
763 static void asf_reset_header(AVFormatContext *s)
764 {
765     ASFContext *asf = s->priv_data;
766     ASFStream *asf_st;
767     int i;
768
769     asf->packet_nb_frames = 0;
770     asf->packet_timestamp_start = -1;
771     asf->packet_timestamp_end = -1;
772     asf->packet_size_left = 0;
773     asf->packet_segments = 0;
774     asf->packet_flags = 0;
775     asf->packet_property = 0;
776     asf->packet_timestamp = 0;
777     asf->packet_segsizetype = 0;
778     asf->packet_segments = 0;
779     asf->packet_seq = 0;
780     asf->packet_replic_size = 0;
781     asf->packet_key_frame = 0;
782     asf->packet_padsize = 0;
783     asf->packet_frag_offset = 0;
784     asf->packet_frag_size = 0;
785     asf->packet_frag_timestamp = 0;
786     asf->packet_multi_size = 0;
787     asf->packet_obj_size = 0;
788     asf->packet_time_delta = 0;
789     asf->packet_time_start = 0;
790
791     for(i=0; i<s->nb_streams; i++){
792         asf_st= s->streams[i]->priv_data;
793         av_free_packet(&asf_st->pkt);
794         asf_st->frag_offset=0;
795         asf_st->seq=0;
796     }
797     asf->asf_st= NULL;
798 }
799
800 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
801 {
802     ASFContext *asf = s->priv_data;
803     AVPacket pkt1, *pkt = &pkt1;
804     ASFStream *asf_st;
805     int64_t pts;
806     int64_t pos= *ppos;
807     int i;
808     int64_t start_pos[s->nb_streams];
809
810     for(i=0; i<s->nb_streams; i++){
811         start_pos[i]= pos;
812     }
813
814     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
815     *ppos= pos;
816     url_fseek(&s->pb, pos, SEEK_SET);
817
818 //printf("asf_read_pts\n");
819     asf_reset_header(s);
820     for(;;){
821         if (av_read_frame(s, pkt) < 0){
822             av_log(s, AV_LOG_INFO, "seek failed\n");
823             return AV_NOPTS_VALUE;
824         }
825
826         pts= pkt->pts;
827
828         av_free_packet(pkt);
829         if(pkt->flags&PKT_FLAG_KEY){
830             i= pkt->stream_index;
831
832             asf_st= s->streams[i]->priv_data;
833
834             assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
835             pos= asf_st->packet_pos;
836
837             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
838             start_pos[i]= asf_st->packet_pos + 1;
839
840             if(pkt->stream_index == stream_index)
841                break;
842         }
843     }
844
845     *ppos= pos;
846 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
847
848     return pts;
849 }
850
851 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
852 {
853     GUID g;
854     ASFContext *asf = s->priv_data;
855     int64_t gsize, itime;
856     int64_t pos, current_pos, index_pts;
857     int i;
858     int pct,ict;
859
860     current_pos = url_ftell(&s->pb);
861
862     url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
863     get_guid(&s->pb, &g);
864     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
865         gsize = get_le64(&s->pb);
866         get_guid(&s->pb, &g);
867         itime=get_le64(&s->pb);
868         pct=get_le32(&s->pb);
869         ict=get_le32(&s->pb);
870         av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
871
872         for (i=0;i<ict;i++){
873             int pktnum=get_le32(&s->pb);
874             int pktct =get_le16(&s->pb);
875             av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
876
877             pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
878             index_pts=av_rescale(itime, i, 10000);
879
880             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
881         }
882         asf->index_read= 1;
883     }
884     url_fseek(&s->pb, current_pos, SEEK_SET);
885 }
886
887 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
888 {
889     ASFContext *asf = s->priv_data;
890     AVStream *st = s->streams[stream_index];
891     int64_t pos;
892     int index;
893
894     if (asf->packet_size <= 0)
895         return -1;
896
897     if (!asf->index_read)
898         asf_build_simple_index(s, stream_index);
899
900     if(!(asf->index_read && st->index_entries)){
901         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
902             return -1;
903     }else{
904         index= av_index_search_timestamp(st, pts, flags);
905         if(index<0)
906             return -1;
907
908         /* find the position */
909         pos = st->index_entries[index].pos;
910         pts = st->index_entries[index].timestamp;
911
912     // various attempts to find key frame have failed so far
913     //    asf_reset_header(s);
914     //    url_fseek(&s->pb, pos, SEEK_SET);
915     //    key_pos = pos;
916     //     for(i=0;i<16;i++){
917     //         pos = url_ftell(&s->pb);
918     //         if (av_read_frame(s, &pkt) < 0){
919     //             av_log(s, AV_LOG_INFO, "seek failed\n");
920     //             return -1;
921     //         }
922     //         asf_st = s->streams[stream_index]->priv_data;
923     //         pos += st->parser->frame_offset;
924     //
925     //         if (pkt.size > b) {
926     //             b = pkt.size;
927     //             key_pos = pos;
928     //         }
929     //
930     //         av_free_packet(&pkt);
931     //     }
932
933         /* do the seek */
934         av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
935         url_fseek(&s->pb, pos, SEEK_SET);
936     }
937     asf_reset_header(s);
938     return 0;
939 }
940
941 AVInputFormat asf_demuxer = {
942     "asf",
943     "asf format",
944     sizeof(ASFContext),
945     asf_probe,
946     asf_read_header,
947     asf_read_packet,
948     asf_read_close,
949     asf_read_seek,
950     asf_read_pts,
951 };