Mark gsize variable as av_unused, fixes the warning:
[ffmpeg.git] / libavformat / asfdec.c
1 /*
2  * ASF compatible demuxer
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 #include "libavutil/common.h"
23 #include "libavcodec/mpegaudio.h"
24 #include "avformat.h"
25 #include "riff.h"
26 #include "asf.h"
27 #include "asfcrypt.h"
28
29 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
30
31 #undef NDEBUG
32 #include <assert.h>
33
34 #define FRAME_HEADER_SIZE 17
35 // Fix Me! FRAME_HEADER_SIZE may be different.
36
37 static const ff_asf_guid index_guid = {
38     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
39 };
40
41 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
42     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
43 };
44 /**********************************/
45 /* decoding */
46
47 //#define DEBUG
48
49 #ifdef DEBUG
50 #define PRINT_IF_GUID(g,cmp) \
51 if (!guidcmp(g, &cmp)) \
52     dprintf(NULL, "(GUID: %s) ", #cmp)
53
54 static void print_guid(const ff_asf_guid *g)
55 {
56     int i;
57     PRINT_IF_GUID(g, ff_asf_header);
58     else PRINT_IF_GUID(g, ff_asf_file_header);
59     else PRINT_IF_GUID(g, ff_asf_stream_header);
60     else PRINT_IF_GUID(g, ff_asf_audio_stream);
61     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
62     else PRINT_IF_GUID(g, ff_asf_video_stream);
63     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
64     else PRINT_IF_GUID(g, ff_asf_command_stream);
65     else PRINT_IF_GUID(g, ff_asf_comment_header);
66     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
67     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
68     else PRINT_IF_GUID(g, ff_asf_data_header);
69     else PRINT_IF_GUID(g, index_guid);
70     else PRINT_IF_GUID(g, ff_asf_head1_guid);
71     else PRINT_IF_GUID(g, ff_asf_head2_guid);
72     else PRINT_IF_GUID(g, ff_asf_my_guid);
73     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
74     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
75     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
76     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
77     else PRINT_IF_GUID(g, ff_asf_metadata_header);
78     else PRINT_IF_GUID(g, stream_bitrate_guid);
79     else
80         dprintf(NULL, "(GUID: unknown) ");
81     for(i=0;i<16;i++)
82         dprintf(NULL, " 0x%02x,", (*g)[i]);
83     dprintf(NULL, "}\n");
84 }
85 #undef PRINT_IF_GUID
86 #else
87 #define print_guid(g)
88 #endif
89
90 static int guidcmp(const void *g1, const void *g2)
91 {
92     return memcmp(g1, g2, sizeof(ff_asf_guid));
93 }
94
95 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
96 {
97     assert(sizeof(*g) == 16);
98     get_buffer(s, *g, sizeof(*g));
99 }
100
101 #if 0
102 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
103 {
104     int len, c;
105     char *q;
106
107     len = get_le16(pb);
108     q = buf;
109     while (len > 0) {
110         c = get_le16(pb);
111         if ((q - buf) < buf_size - 1)
112             *q++ = c;
113         len--;
114     }
115     *q = '\0';
116 }
117 #endif
118
119 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
120 {
121     char* q = buf;
122     len /= 2;
123     while (len--) {
124         uint8_t tmp;
125         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
126     }
127     *q = '\0';
128 }
129
130 static int asf_probe(AVProbeData *pd)
131 {
132     /* check file header */
133     if (!guidcmp(pd->buf, &ff_asf_header))
134         return AVPROBE_SCORE_MAX;
135     else
136         return 0;
137 }
138
139 static int get_value(ByteIOContext *pb, int type){
140     switch(type){
141         case 2: return get_le32(pb);
142         case 3: return get_le32(pb);
143         case 4: return get_le64(pb);
144         case 5: return get_le16(pb);
145         default:return INT_MIN;
146     }
147 }
148
149 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
150 {
151     char value[1024];
152     if (type <= 1) {         // unicode or byte
153         get_str16_nolen(s->pb, len, value, sizeof(value));
154     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
155         uint64_t num = get_value(s->pb, type);
156         snprintf(value, sizeof(value), "%"PRIu64, num);
157     } else {
158         url_fskip(s->pb, len);
159         return;
160     }
161     if (!strncmp(key, "WM/", 3))
162         key += 3;
163     av_metadata_set(&s->metadata, key, value);
164 }
165
166 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
167 {
168     ASFContext *asf = s->priv_data;
169     ff_asf_guid g;
170     ByteIOContext *pb = s->pb;
171     AVStream *st;
172     ASFStream *asf_st;
173     int size, i;
174     int64_t gsize;
175     AVRational dar[128];
176     uint32_t bitrate[128];
177
178     memset(dar, 0, sizeof(dar));
179     memset(bitrate, 0, sizeof(bitrate));
180
181     get_guid(pb, &g);
182     if (guidcmp(&g, &ff_asf_header))
183         return -1;
184     get_le64(pb);
185     get_le32(pb);
186     get_byte(pb);
187     get_byte(pb);
188     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
189     for(;;) {
190         get_guid(pb, &g);
191         gsize = get_le64(pb);
192         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
193         print_guid(&g);
194         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
195         if (!guidcmp(&g, &ff_asf_data_header)) {
196             asf->data_object_offset = url_ftell(pb);
197             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
198             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
199                 asf->data_object_size = gsize - 24;
200             } else {
201                 asf->data_object_size = (uint64_t)-1;
202             }
203             break;
204         }
205         if (gsize < 24)
206             return -1;
207         if (!guidcmp(&g, &ff_asf_file_header)) {
208             get_guid(pb, &asf->hdr.guid);
209             asf->hdr.file_size          = get_le64(pb);
210             asf->hdr.create_time        = get_le64(pb);
211             asf->nb_packets             = get_le64(pb);
212             asf->hdr.play_time          = get_le64(pb);
213             asf->hdr.send_time          = get_le64(pb);
214             asf->hdr.preroll            = get_le32(pb);
215             asf->hdr.ignore             = get_le32(pb);
216             asf->hdr.flags              = get_le32(pb);
217             asf->hdr.min_pktsize        = get_le32(pb);
218             asf->hdr.max_pktsize        = get_le32(pb);
219             asf->hdr.max_bitrate        = get_le32(pb);
220             asf->packet_size = asf->hdr.max_pktsize;
221         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
222             enum CodecType type;
223             int type_specific_size, sizeX;
224             uint64_t total_size;
225             unsigned int tag1;
226             int64_t pos1, pos2, start_time;
227             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
228
229             pos1 = url_ftell(pb);
230
231             st = av_new_stream(s, 0);
232             if (!st)
233                 return AVERROR(ENOMEM);
234             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
235             asf_st = av_mallocz(sizeof(ASFStream));
236             if (!asf_st)
237                 return AVERROR(ENOMEM);
238             st->priv_data = asf_st;
239             start_time = asf->hdr.preroll;
240
241             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
242                 st->duration = asf->hdr.send_time /
243                     (10000000 / 1000) - start_time;
244             }
245             get_guid(pb, &g);
246
247             test_for_ext_stream_audio = 0;
248             if (!guidcmp(&g, &ff_asf_audio_stream)) {
249                 type = CODEC_TYPE_AUDIO;
250             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
251                 type = CODEC_TYPE_VIDEO;
252             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
253                 type = CODEC_TYPE_DATA;
254             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
255                 test_for_ext_stream_audio = 1;
256                 type = CODEC_TYPE_UNKNOWN;
257             } else {
258                 return -1;
259             }
260             get_guid(pb, &g);
261             total_size = get_le64(pb);
262             type_specific_size = get_le32(pb);
263             get_le32(pb);
264             st->id = get_le16(pb) & 0x7f; /* stream id */
265             // mapping of asf ID to AV stream ID;
266             asf->asfid2avid[st->id] = s->nb_streams - 1;
267
268             get_le32(pb);
269
270             if (test_for_ext_stream_audio) {
271                 get_guid(pb, &g);
272                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
273                     type = CODEC_TYPE_AUDIO;
274                     is_dvr_ms_audio=1;
275                     get_guid(pb, &g);
276                     get_le32(pb);
277                     get_le32(pb);
278                     get_le32(pb);
279                     get_guid(pb, &g);
280                     get_le32(pb);
281                 }
282             }
283
284             st->codec->codec_type = type;
285             if (type == CODEC_TYPE_AUDIO) {
286                 get_wav_header(pb, st->codec, type_specific_size);
287                 if (is_dvr_ms_audio) {
288                     // codec_id and codec_tag are unreliable in dvr_ms
289                     // files. Set them later by probing stream.
290                     st->codec->codec_id = CODEC_ID_PROBE;
291                     st->codec->codec_tag = 0;
292                 }
293                 if (st->codec->codec_id == CODEC_ID_AAC) {
294                     st->need_parsing = AVSTREAM_PARSE_NONE;
295                 } else {
296                     st->need_parsing = AVSTREAM_PARSE_FULL;
297                 }
298                 /* We have to init the frame size at some point .... */
299                 pos2 = url_ftell(pb);
300                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
301                     asf_st->ds_span = get_byte(pb);
302                     asf_st->ds_packet_size = get_le16(pb);
303                     asf_st->ds_chunk_size = get_le16(pb);
304                     get_le16(pb); //ds_data_size
305                     get_byte(pb); //ds_silence_data
306                 }
307                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
308                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
309                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
310                 if (asf_st->ds_span > 1) {
311                     if (!asf_st->ds_chunk_size
312                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
313                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
314                         asf_st->ds_span = 0; // disable descrambling
315                 }
316                 switch (st->codec->codec_id) {
317                 case CODEC_ID_MP3:
318                     st->codec->frame_size = MPA_FRAME_SIZE;
319                     break;
320                 case CODEC_ID_PCM_S16LE:
321                 case CODEC_ID_PCM_S16BE:
322                 case CODEC_ID_PCM_U16LE:
323                 case CODEC_ID_PCM_U16BE:
324                 case CODEC_ID_PCM_S8:
325                 case CODEC_ID_PCM_U8:
326                 case CODEC_ID_PCM_ALAW:
327                 case CODEC_ID_PCM_MULAW:
328                     st->codec->frame_size = 1;
329                     break;
330                 default:
331                     /* This is probably wrong, but it prevents a crash later */
332                     st->codec->frame_size = 1;
333                     break;
334                 }
335             } else if (type == CODEC_TYPE_VIDEO) {
336                 get_le32(pb);
337                 get_le32(pb);
338                 get_byte(pb);
339                 size = get_le16(pb); /* size */
340                 sizeX= get_le32(pb); /* size */
341                 st->codec->width = get_le32(pb);
342                 st->codec->height = get_le32(pb);
343                 /* not available for asf */
344                 get_le16(pb); /* panes */
345                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
346                 tag1 = get_le32(pb);
347                 url_fskip(pb, 20);
348 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
349                 size= sizeX;
350                 if (size > 40) {
351                     st->codec->extradata_size = size - 40;
352                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
353                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
354                 }
355
356                 /* Extract palette from extradata if bpp <= 8 */
357                 /* This code assumes that extradata contains only palette */
358                 /* This is true for all paletted codecs implemented in ffmpeg */
359                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
360                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
361 #ifdef WORDS_BIGENDIAN
362                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
363                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
364 #else
365                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
366                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
367 #endif
368                     st->codec->palctrl->palette_changed = 1;
369                 }
370
371                 st->codec->codec_tag = tag1;
372                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
373                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
374                     st->need_parsing = AVSTREAM_PARSE_FULL;
375             }
376             pos2 = url_ftell(pb);
377             url_fskip(pb, gsize - (pos2 - pos1 + 24));
378         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
379             int len1, len2, len3, len4, len5;
380
381             len1 = get_le16(pb);
382             len2 = get_le16(pb);
383             len3 = get_le16(pb);
384             len4 = get_le16(pb);
385             len5 = get_le16(pb);
386             get_tag(s, "title"    , 0, len1);
387             get_tag(s, "author"   , 0, len2);
388             get_tag(s, "copyright", 0, len3);
389             get_tag(s, "comment"  , 0, len4);
390             url_fskip(pb, len5);
391         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
392             int stream_count = get_le16(pb);
393             int j;
394
395 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
396 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
397             for(j = 0; j < stream_count; j++) {
398                 int flags, bitrate, stream_id;
399
400                 flags= get_le16(pb);
401                 bitrate= get_le32(pb);
402                 stream_id= (flags & 0x7f);
403 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
404                 asf->stream_bitrates[stream_id]= bitrate;
405             }
406         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
407             int desc_count, i;
408
409             desc_count = get_le16(pb);
410             for(i=0;i<desc_count;i++) {
411                     int name_len,value_type,value_len;
412                     char name[1024];
413
414                     name_len = get_le16(pb);
415                     get_str16_nolen(pb, name_len, name, sizeof(name));
416                     value_type = get_le16(pb);
417                     value_len  = get_le16(pb);
418                     get_tag(s, name, value_type, value_len);
419             }
420         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
421             int n, stream_num, name_len, value_len, value_type, value_num;
422             n = get_le16(pb);
423
424             for(i=0;i<n;i++) {
425                 char name[1024];
426
427                 get_le16(pb); //lang_list_index
428                 stream_num= get_le16(pb);
429                 name_len=   get_le16(pb);
430                 value_type= get_le16(pb);
431                 value_len=  get_le32(pb);
432
433                 get_str16_nolen(pb, name_len, name, sizeof(name));
434 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
435                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
436                 url_fskip(pb, value_len - 2);
437
438                 if(stream_num<128){
439                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
440                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
441                 }
442             }
443         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
444             int ext_len, payload_ext_ct, stream_ct;
445             uint32_t ext_d, leak_rate, stream_num;
446
447             get_le64(pb); // starttime
448             get_le64(pb); // endtime
449             leak_rate = get_le32(pb); // leak-datarate
450             get_le32(pb); // bucket-datasize
451             get_le32(pb); // init-bucket-fullness
452             get_le32(pb); // alt-leak-datarate
453             get_le32(pb); // alt-bucket-datasize
454             get_le32(pb); // alt-init-bucket-fullness
455             get_le32(pb); // max-object-size
456             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
457             stream_num = get_le16(pb); // stream-num
458             get_le16(pb); // stream-language-id-index
459             get_le64(pb); // avg frametime in 100ns units
460             stream_ct = get_le16(pb); //stream-name-count
461             payload_ext_ct = get_le16(pb); //payload-extension-system-count
462
463             if (stream_num < 128)
464                 bitrate[stream_num] = leak_rate;
465
466             for (i=0; i<stream_ct; i++){
467                 get_le16(pb);
468                 ext_len = get_le16(pb);
469                 url_fseek(pb, ext_len, SEEK_CUR);
470             }
471
472             for (i=0; i<payload_ext_ct; i++){
473                 get_guid(pb, &g);
474                 ext_d=get_le16(pb);
475                 ext_len=get_le32(pb);
476                 url_fseek(pb, ext_len, SEEK_CUR);
477             }
478
479             // there could be a optional stream properties object to follow
480             // if so the next iteration will pick it up
481         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
482             int v1, v2;
483             get_guid(pb, &g);
484             v1 = get_le32(pb);
485             v2 = get_le16(pb);
486 #if 0
487         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
488             int len, v1, n, num;
489             char str[256], *q;
490             char tag[16];
491
492             get_guid(pb, &g);
493             print_guid(&g);
494
495             n = get_le32(pb);
496             for(i=0;i<n;i++) {
497                 num = get_le16(pb); /* stream number */
498                 get_str16(pb, str, sizeof(str));
499                 get_str16(pb, str, sizeof(str));
500                 len = get_le16(pb);
501                 q = tag;
502                 while (len > 0) {
503                     v1 = get_byte(pb);
504                     if ((q - tag) < sizeof(tag) - 1)
505                         *q++ = v1;
506                     len--;
507                 }
508                 *q = '\0';
509             }
510 #endif
511         } else if (url_feof(pb)) {
512             return -1;
513         } else {
514             url_fseek(pb, gsize - 24, SEEK_CUR);
515         }
516     }
517     get_guid(pb, &g);
518     get_le64(pb);
519     get_byte(pb);
520     get_byte(pb);
521     if (url_feof(pb))
522         return -1;
523     asf->data_offset = url_ftell(pb);
524     asf->packet_size_left = 0;
525
526
527     for(i=0; i<128; i++){
528         int stream_num= asf->asfid2avid[i];
529         if(stream_num>=0){
530             AVStream *st = s->streams[stream_num];
531             if (!st->codec->bit_rate)
532                 st->codec->bit_rate = bitrate[i];
533             if (dar[i].num > 0 && dar[i].den > 0)
534                 av_reduce(&st->sample_aspect_ratio.num,
535                           &st->sample_aspect_ratio.den,
536                           dar[i].num, dar[i].den, INT_MAX);
537 //av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
538         }
539     }
540
541     return 0;
542 }
543
544 #define DO_2BITS(bits, var, defval) \
545     switch (bits & 3) \
546     { \
547     case 3: var = get_le32(pb); rsize += 4; break; \
548     case 2: var = get_le16(pb); rsize += 2; break; \
549     case 1: var = get_byte(pb); rsize++; break; \
550     default: var = defval; break; \
551     }
552
553 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
554 {
555     ASFContext *asf = s->priv_data;
556     uint32_t packet_length, padsize;
557     int rsize = 8;
558     int c, d, e, off;
559
560     off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
561
562     c=d=e=-1;
563     while(off-- > 0){
564         c=d; d=e;
565         e= get_byte(pb);
566         if(c == 0x82 && !d && !e)
567             break;
568     }
569
570     if (c != 0x82) {
571         if (!url_feof(pb))
572             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
573     }
574     if ((c & 0x8f) == 0x82) {
575         if (d || e) {
576             if (!url_feof(pb))
577                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
578             return -1;
579         }
580         c= get_byte(pb);
581         d= get_byte(pb);
582         rsize+=3;
583     }else{
584         url_fseek(pb, -1, SEEK_CUR); //FIXME
585     }
586
587     asf->packet_flags    = c;
588     asf->packet_property = d;
589
590     DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
591     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
592     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
593
594     //the following checks prevent overflows and infinite loops
595     if(packet_length >= (1U<<29)){
596         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
597         return -1;
598     }
599     if(padsize >= packet_length){
600         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
601         return -1;
602     }
603
604     asf->packet_timestamp = get_le32(pb);
605     get_le16(pb); /* duration */
606     // rsize has at least 11 bytes which have to be present
607
608     if (asf->packet_flags & 0x01) {
609         asf->packet_segsizetype = get_byte(pb); rsize++;
610         asf->packet_segments = asf->packet_segsizetype & 0x3f;
611     } else {
612         asf->packet_segments = 1;
613         asf->packet_segsizetype = 0x80;
614     }
615     asf->packet_size_left = packet_length - padsize - rsize;
616     if (packet_length < asf->hdr.min_pktsize)
617         padsize += asf->hdr.min_pktsize - packet_length;
618     asf->packet_padsize = padsize;
619     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
620     return 0;
621 }
622
623 /**
624  *
625  * @return <0 if error
626  */
627 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
628     ASFContext *asf = s->priv_data;
629     int rsize = 1;
630     int num = get_byte(pb);
631     int64_t ts0, ts1;
632
633     asf->packet_segments--;
634     asf->packet_key_frame = num >> 7;
635     asf->stream_index = asf->asfid2avid[num & 0x7f];
636     // sequence should be ignored!
637     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
638     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
639     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
640 //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);
641     if (asf->packet_replic_size >= 8) {
642         asf->packet_obj_size = get_le32(pb);
643         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
644             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
645             return -1;
646         }
647         asf->packet_frag_timestamp = get_le32(pb); // timestamp
648         if(asf->packet_replic_size >= 8+38+4){
649 //            for(i=0; i<asf->packet_replic_size-8; i++)
650 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
651 //            av_log(s, AV_LOG_DEBUG, "\n");
652             url_fskip(pb, 10);
653             ts0= get_le64(pb);
654             ts1= get_le64(pb);
655             url_fskip(pb, 12);
656             get_le32(pb);
657             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
658             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
659             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
660         }else
661             url_fskip(pb, asf->packet_replic_size - 8);
662         rsize += asf->packet_replic_size; // FIXME - check validity
663     } else if (asf->packet_replic_size==1){
664         // multipacket - frag_offset is beginning timestamp
665         asf->packet_time_start = asf->packet_frag_offset;
666         asf->packet_frag_offset = 0;
667         asf->packet_frag_timestamp = asf->packet_timestamp;
668
669         asf->packet_time_delta = get_byte(pb);
670         rsize++;
671     }else if(asf->packet_replic_size!=0){
672         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
673         return -1;
674     }
675     if (asf->packet_flags & 0x01) {
676         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
677         if(asf->packet_frag_size > asf->packet_size_left - rsize){
678             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
679             return -1;
680         }
681         //printf("Fragsize %d\n", asf->packet_frag_size);
682     } else {
683         asf->packet_frag_size = asf->packet_size_left - rsize;
684         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
685     }
686     if (asf->packet_replic_size == 1) {
687         asf->packet_multi_size = asf->packet_frag_size;
688         if (asf->packet_multi_size > asf->packet_size_left)
689             return -1;
690     }
691     asf->packet_size_left -= rsize;
692     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
693
694     return 0;
695 }
696
697 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
698 {
699     ASFContext *asf = s->priv_data;
700     ASFStream *asf_st = 0;
701     for (;;) {
702         if(url_feof(pb))
703             return AVERROR_EOF;
704         if (asf->packet_size_left < FRAME_HEADER_SIZE
705             || asf->packet_segments < 1) {
706             //asf->packet_size_left <= asf->packet_padsize) {
707             int ret = asf->packet_size_left + asf->packet_padsize;
708             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
709             assert(ret>=0);
710             /* fail safe */
711             url_fskip(pb, ret);
712
713             asf->packet_pos= url_ftell(pb);
714             if (asf->data_object_size != (uint64_t)-1 &&
715                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
716                 return AVERROR_EOF; /* Do not exceed the size of the data object */
717             return 1;
718         }
719         if (asf->packet_time_start == 0) {
720             if(asf_read_frame_header(s, pb) < 0){
721                 asf->packet_segments= 0;
722                 continue;
723             }
724             if (asf->stream_index < 0
725                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
726                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
727                 ) {
728                 asf->packet_time_start = 0;
729                 /* unhandled packet (should not happen) */
730                 url_fskip(pb, asf->packet_frag_size);
731                 asf->packet_size_left -= asf->packet_frag_size;
732                 if(asf->stream_index < 0)
733                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
734                 continue;
735             }
736             asf->asf_st = s->streams[asf->stream_index]->priv_data;
737         }
738         asf_st = asf->asf_st;
739
740         if (asf->packet_replic_size == 1) {
741             // frag_offset is here used as the beginning timestamp
742             asf->packet_frag_timestamp = asf->packet_time_start;
743             asf->packet_time_start += asf->packet_time_delta;
744             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
745             asf->packet_size_left--;
746             asf->packet_multi_size--;
747             if (asf->packet_multi_size < asf->packet_obj_size)
748             {
749                 asf->packet_time_start = 0;
750                 url_fskip(pb, asf->packet_multi_size);
751                 asf->packet_size_left -= asf->packet_multi_size;
752                 continue;
753             }
754             asf->packet_multi_size -= asf->packet_obj_size;
755             //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);
756         }
757         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
758               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
759            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
760             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
761                 asf_st->frag_offset, asf->packet_frag_size,
762                 asf->packet_obj_size, asf_st->pkt.size);
763             asf->packet_obj_size= asf_st->pkt.size;
764         }
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.dts = 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         if (s->key && s->keylen == 20)
807             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
808                             asf->packet_frag_size);
809         asf_st->frag_offset += asf->packet_frag_size;
810         /* test if whole packet is read */
811         if (asf_st->frag_offset == asf_st->pkt.size) {
812             //workaround for macroshit radio DVR-MS files
813             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
814                && asf_st->pkt.size > 100){
815                 int i;
816                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
817                 if(i == asf_st->pkt.size){
818                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
819                     asf_st->frag_offset = 0;
820                     av_free_packet(&asf_st->pkt);
821                     continue;
822                 }
823             }
824
825             /* return packet */
826             if (asf_st->ds_span > 1) {
827               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
828                     av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
829               }else{
830                 /* packet descrambling */
831                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
832                 if (newdata) {
833                     int offset = 0;
834                     while (offset < asf_st->pkt.size) {
835                         int off = offset / asf_st->ds_chunk_size;
836                         int row = off / asf_st->ds_span;
837                         int col = off % asf_st->ds_span;
838                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
839                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
840
841                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
842                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
843                         memcpy(newdata + offset,
844                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
845                                asf_st->ds_chunk_size);
846                         offset += asf_st->ds_chunk_size;
847                     }
848                     av_free(asf_st->pkt.data);
849                     asf_st->pkt.data = newdata;
850                 }
851               }
852             }
853             asf_st->frag_offset = 0;
854             *pkt= asf_st->pkt;
855             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
856             asf_st->pkt.size = 0;
857             asf_st->pkt.data = 0;
858             break; // packet completed
859         }
860     }
861     return 0;
862 }
863
864 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
865 {
866     ASFContext *asf = s->priv_data;
867
868     for (;;) {
869         int ret;
870
871         /* parse cached packets, if any */
872         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
873             return ret;
874         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
875             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
876         asf->packet_time_start = 0;
877     }
878
879     return 0;
880 }
881
882 // Added to support seeking after packets have been read
883 // If information is not reset, read_packet fails due to
884 // leftover information from previous reads
885 static void asf_reset_header(AVFormatContext *s)
886 {
887     ASFContext *asf = s->priv_data;
888     ASFStream *asf_st;
889     int i;
890
891     asf->packet_nb_frames = 0;
892     asf->packet_size_left = 0;
893     asf->packet_segments = 0;
894     asf->packet_flags = 0;
895     asf->packet_property = 0;
896     asf->packet_timestamp = 0;
897     asf->packet_segsizetype = 0;
898     asf->packet_segments = 0;
899     asf->packet_seq = 0;
900     asf->packet_replic_size = 0;
901     asf->packet_key_frame = 0;
902     asf->packet_padsize = 0;
903     asf->packet_frag_offset = 0;
904     asf->packet_frag_size = 0;
905     asf->packet_frag_timestamp = 0;
906     asf->packet_multi_size = 0;
907     asf->packet_obj_size = 0;
908     asf->packet_time_delta = 0;
909     asf->packet_time_start = 0;
910
911     for(i=0; i<s->nb_streams; i++){
912         asf_st= s->streams[i]->priv_data;
913         av_free_packet(&asf_st->pkt);
914         asf_st->frag_offset=0;
915         asf_st->seq=0;
916     }
917     asf->asf_st= NULL;
918 }
919
920 static int asf_read_close(AVFormatContext *s)
921 {
922     int i;
923
924     asf_reset_header(s);
925     for(i=0;i<s->nb_streams;i++) {
926         AVStream *st = s->streams[i];
927         av_free(st->codec->palctrl);
928     }
929     return 0;
930 }
931
932 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
933 {
934     ASFContext *asf = s->priv_data;
935     AVPacket pkt1, *pkt = &pkt1;
936     ASFStream *asf_st;
937     int64_t pts;
938     int64_t pos= *ppos;
939     int i;
940     int64_t start_pos[s->nb_streams];
941
942     for(i=0; i<s->nb_streams; i++){
943         start_pos[i]= pos;
944     }
945
946     pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
947     *ppos= pos;
948     url_fseek(s->pb, pos, SEEK_SET);
949
950 //printf("asf_read_pts\n");
951     asf_reset_header(s);
952     for(;;){
953         if (av_read_frame(s, pkt) < 0){
954             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
955             return AV_NOPTS_VALUE;
956         }
957
958         pts= pkt->pts;
959
960         av_free_packet(pkt);
961         if(pkt->flags&PKT_FLAG_KEY){
962             i= pkt->stream_index;
963
964             asf_st= s->streams[i]->priv_data;
965
966 //            assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
967             pos= asf_st->packet_pos;
968
969             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
970             start_pos[i]= asf_st->packet_pos + 1;
971
972             if(pkt->stream_index == stream_index)
973                break;
974         }
975     }
976
977     *ppos= pos;
978 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
979
980     return pts;
981 }
982
983 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
984 {
985     ff_asf_guid g;
986     ASFContext *asf = s->priv_data;
987     int64_t current_pos= url_ftell(s->pb);
988     int i;
989
990     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
991     get_guid(s->pb, &g);
992     if (!guidcmp(&g, &index_guid)) {
993         int64_t itime;
994         int pct, ict;
995         int64_t av_unused gsize= get_le64(s->pb);
996         get_guid(s->pb, &g);
997         itime=get_le64(s->pb);
998         pct=get_le32(s->pb);
999         ict=get_le32(s->pb);
1000         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1001
1002         for (i=0;i<ict;i++){
1003             int pktnum=get_le32(s->pb);
1004             int pktct =get_le16(s->pb);
1005             int64_t pos      = s->data_offset + asf->packet_size*(int64_t)pktnum;
1006             int64_t index_pts= av_rescale(itime, i, 10000);
1007
1008             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1009             av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
1010         }
1011         asf->index_read= 1;
1012     }
1013     url_fseek(s->pb, current_pos, SEEK_SET);
1014 }
1015
1016 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1017 {
1018     ASFContext *asf = s->priv_data;
1019     AVStream *st = s->streams[stream_index];
1020     int64_t pos;
1021     int index;
1022
1023     if (asf->packet_size <= 0)
1024         return -1;
1025
1026     /* Try using the protocol's read_seek if available */
1027     if(s->pb) {
1028         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1029         if(ret >= 0)
1030             asf_reset_header(s);
1031         if (ret != AVERROR(ENOSYS))
1032             return ret;
1033     }
1034
1035     if (!asf->index_read)
1036         asf_build_simple_index(s, stream_index);
1037
1038     if(!(asf->index_read && st->index_entries)){
1039         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1040             return -1;
1041     }else{
1042         index= av_index_search_timestamp(st, pts, flags);
1043         if(index<0)
1044             return -1;
1045
1046         /* find the position */
1047         pos = st->index_entries[index].pos;
1048
1049     // various attempts to find key frame have failed so far
1050     //    asf_reset_header(s);
1051     //    url_fseek(s->pb, pos, SEEK_SET);
1052     //    key_pos = pos;
1053     //     for(i=0;i<16;i++){
1054     //         pos = url_ftell(s->pb);
1055     //         if (av_read_frame(s, &pkt) < 0){
1056     //             av_log(s, AV_LOG_INFO, "seek failed\n");
1057     //             return -1;
1058     //         }
1059     //         asf_st = s->streams[stream_index]->priv_data;
1060     //         pos += st->parser->frame_offset;
1061     //
1062     //         if (pkt.size > b) {
1063     //             b = pkt.size;
1064     //             key_pos = pos;
1065     //         }
1066     //
1067     //         av_free_packet(&pkt);
1068     //     }
1069
1070         /* do the seek */
1071         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1072         url_fseek(s->pb, pos, SEEK_SET);
1073     }
1074     asf_reset_header(s);
1075     return 0;
1076 }
1077
1078 AVInputFormat asf_demuxer = {
1079     "asf",
1080     NULL_IF_CONFIG_SMALL("ASF format"),
1081     sizeof(ASFContext),
1082     asf_probe,
1083     asf_read_header,
1084     asf_read_packet,
1085     asf_read_close,
1086     asf_read_seek,
1087     asf_read_pts,
1088     .metadata_conv = ff_asf_metadata_conv,
1089 };