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Move/add COSTABLE/SINTABLE macros to dsputil to add extern definitions
[FFMpeg-mirror/lagarith.git] / libavformat / asfdec.c
blob543faf29d4caa5a3784c679d1843f32c5c9d94ab
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 //#define DEBUG
23
24 #include "libavutil/common.h"
25 #include "libavutil/avstring.h"
26 #include "libavcodec/mpegaudio.h"
27 #include "avformat.h"
28 #include "riff.h"
29 #include "asf.h"
30 #include "asfcrypt.h"
31 #include "avlanguage.h"
32
33 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
34
35 #undef NDEBUG
36 #include <assert.h>
37
38 #define FRAME_HEADER_SIZE 17
39 // Fix Me! FRAME_HEADER_SIZE may be different.
40
41 static const ff_asf_guid index_guid = {
42 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
43 };
44
45 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
46 0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
47 };
48 /**********************************/
49 /* decoding */
50
51 static int guidcmp(const void *g1, const void *g2)
52 {
53 return memcmp(g1, g2, sizeof(ff_asf_guid));
54 }
55
56 #ifdef DEBUG
57 #define PRINT_IF_GUID(g,cmp) \
58 if (!guidcmp(g, &cmp)) \
59 dprintf(NULL, "(GUID: %s) ", #cmp)
60
61 static void print_guid(const ff_asf_guid *g)
62 {
63 int i;
64 PRINT_IF_GUID(g, ff_asf_header);
65 else PRINT_IF_GUID(g, ff_asf_file_header);
66 else PRINT_IF_GUID(g, ff_asf_stream_header);
67 else PRINT_IF_GUID(g, ff_asf_audio_stream);
68 else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
69 else PRINT_IF_GUID(g, ff_asf_video_stream);
70 else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
71 else PRINT_IF_GUID(g, ff_asf_command_stream);
72 else PRINT_IF_GUID(g, ff_asf_comment_header);
73 else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
74 else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
75 else PRINT_IF_GUID(g, ff_asf_data_header);
76 else PRINT_IF_GUID(g, index_guid);
77 else PRINT_IF_GUID(g, ff_asf_head1_guid);
78 else PRINT_IF_GUID(g, ff_asf_head2_guid);
79 else PRINT_IF_GUID(g, ff_asf_my_guid);
80 else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
81 else PRINT_IF_GUID(g, ff_asf_extended_content_header);
82 else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
83 else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
84 else PRINT_IF_GUID(g, ff_asf_metadata_header);
85 else PRINT_IF_GUID(g, stream_bitrate_guid);
86 else PRINT_IF_GUID(g, ff_asf_language_guid);
87 else
88 dprintf(NULL, "(GUID: unknown) ");
89 for(i=0;i<16;i++)
90 dprintf(NULL, " 0x%02x,", (*g)[i]);
91 dprintf(NULL, "}\n");
92 }
93 #undef PRINT_IF_GUID
94 #else
95 #define print_guid(g)
96 #endif
97
98 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
99 {
100 assert(sizeof(*g) == 16);
101 get_buffer(s, *g, sizeof(*g));
102 }
103
104 #if 0
105 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
106 {
107 int len, c;
108 char *q;
109
110 len = get_le16(pb);
111 q = buf;
112 while (len > 0) {
113 c = get_le16(pb);
114 if ((q - buf) < buf_size - 1)
115 *q++ = c;
116 len--;
117 }
118 *q = '\0';
119 }
120 #endif
121
122 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
123 {
124 char* q = buf;
125 for (; len > 1; len -= 2) {
126 uint8_t tmp;
127 PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
128 }
129 if (len > 0)
130 url_fskip(pb, len);
131 *q = '\0';
132 }
133
134 static int asf_probe(AVProbeData *pd)
135 {
136 /* check file header */
137 if (!guidcmp(pd->buf, &ff_asf_header))
138 return AVPROBE_SCORE_MAX;
139 else
140 return 0;
141 }
142
143 static int get_value(ByteIOContext *pb, int type){
144 switch(type){
145 case 2: return get_le32(pb);
146 case 3: return get_le32(pb);
147 case 4: return get_le64(pb);
148 case 5: return get_le16(pb);
149 default:return INT_MIN;
150 }
151 }
152
153 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
154 {
155 char value[1024];
156 if (type <= 1) { // unicode or byte
157 get_str16_nolen(s->pb, len, value, sizeof(value));
158 } else if (type <= 5) { // boolean or DWORD or QWORD or WORD
159 uint64_t num = get_value(s->pb, type);
160 snprintf(value, sizeof(value), "%"PRIu64, num);
161 } else {
162 url_fskip(s->pb, len);
163 return;
164 }
165 if (!strncmp(key, "WM/", 3))
166 key += 3;
167 av_metadata_set(&s->metadata, key, value);
168 }
169
170 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
171 {
172 ASFContext *asf = s->priv_data;
173 ff_asf_guid g;
174 ByteIOContext *pb = s->pb;
175 AVStream *st;
176 ASFStream *asf_st;
177 int size, i;
178 int64_t gsize;
179 AVRational dar[128];
180 uint32_t bitrate[128];
181
182 memset(dar, 0, sizeof(dar));
183 memset(bitrate, 0, sizeof(bitrate));
184
185 get_guid(pb, &g);
186 if (guidcmp(&g, &ff_asf_header))
187 return -1;
188 get_le64(pb);
189 get_le32(pb);
190 get_byte(pb);
191 get_byte(pb);
192 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
193 for(;;) {
194 get_guid(pb, &g);
195 gsize = get_le64(pb);
196 dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
197 print_guid(&g);
198 dprintf(s, " size=0x%"PRIx64"\n", gsize);
199 if (!guidcmp(&g, &ff_asf_data_header)) {
200 asf->data_object_offset = url_ftell(pb);
201 // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
202 if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
203 asf->data_object_size = gsize - 24;
204 } else {
205 asf->data_object_size = (uint64_t)-1;
206 }
207 break;
208 }
209 if (gsize < 24)
210 return -1;
211 if (!guidcmp(&g, &ff_asf_file_header)) {
212 get_guid(pb, &asf->hdr.guid);
213 asf->hdr.file_size = get_le64(pb);
214 asf->hdr.create_time = get_le64(pb);
215 asf->nb_packets = get_le64(pb);
216 asf->hdr.play_time = get_le64(pb);
217 asf->hdr.send_time = get_le64(pb);
218 asf->hdr.preroll = get_le32(pb);
219 asf->hdr.ignore = get_le32(pb);
220 asf->hdr.flags = get_le32(pb);
221 asf->hdr.min_pktsize = get_le32(pb);
222 asf->hdr.max_pktsize = get_le32(pb);
223 asf->hdr.max_bitrate = get_le32(pb);
224 s->packet_size = asf->hdr.max_pktsize;
225 } else if (!guidcmp(&g, &ff_asf_stream_header)) {
226 enum CodecType type;
227 int type_specific_size, sizeX;
228 uint64_t total_size;
229 unsigned int tag1;
230 int64_t pos1, pos2, start_time;
231 int test_for_ext_stream_audio, is_dvr_ms_audio=0;
232
233 pos1 = url_ftell(pb);
234
235 st = av_new_stream(s, 0);
236 if (!st)
237 return AVERROR(ENOMEM);
238 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
239 asf_st = av_mallocz(sizeof(ASFStream));
240 if (!asf_st)
241 return AVERROR(ENOMEM);
242 st->priv_data = asf_st;
243 start_time = asf->hdr.preroll;
244
245 asf_st->stream_language_index = 128; // invalid stream index means no language info
246
247 if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
248 st->duration = asf->hdr.play_time /
249 (10000000 / 1000) - start_time;
250 }
251 get_guid(pb, &g);
252
253 test_for_ext_stream_audio = 0;
254 if (!guidcmp(&g, &ff_asf_audio_stream)) {
255 type = CODEC_TYPE_AUDIO;
256 } else if (!guidcmp(&g, &ff_asf_video_stream)) {
257 type = CODEC_TYPE_VIDEO;
258 } else if (!guidcmp(&g, &ff_asf_command_stream)) {
259 type = CODEC_TYPE_DATA;
260 } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
261 test_for_ext_stream_audio = 1;
262 type = CODEC_TYPE_UNKNOWN;
263 } else {
264 return -1;
265 }
266 get_guid(pb, &g);
267 total_size = get_le64(pb);
268 type_specific_size = get_le32(pb);
269 get_le32(pb);
270 st->id = get_le16(pb) & 0x7f; /* stream id */
271 // mapping of asf ID to AV stream ID;
272 asf->asfid2avid[st->id] = s->nb_streams - 1;
273
274 get_le32(pb);
275
276 if (test_for_ext_stream_audio) {
277 get_guid(pb, &g);
278 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
279 type = CODEC_TYPE_AUDIO;
280 is_dvr_ms_audio=1;
281 get_guid(pb, &g);
282 get_le32(pb);
283 get_le32(pb);
284 get_le32(pb);
285 get_guid(pb, &g);
286 get_le32(pb);
287 }
288 }
289
290 st->codec->codec_type = type;
291 if (type == CODEC_TYPE_AUDIO) {
292 ff_get_wav_header(pb, st->codec, type_specific_size);
293 if (is_dvr_ms_audio) {
294 // codec_id and codec_tag are unreliable in dvr_ms
295 // files. Set them later by probing stream.
296 st->codec->codec_id = CODEC_ID_PROBE;
297 st->codec->codec_tag = 0;
298 }
299 if (st->codec->codec_id == CODEC_ID_AAC) {
300 st->need_parsing = AVSTREAM_PARSE_NONE;
301 } else {
302 st->need_parsing = AVSTREAM_PARSE_FULL;
303 }
304 /* We have to init the frame size at some point .... */
305 pos2 = url_ftell(pb);
306 if (gsize >= (pos2 + 8 - pos1 + 24)) {
307 asf_st->ds_span = get_byte(pb);
308 asf_st->ds_packet_size = get_le16(pb);
309 asf_st->ds_chunk_size = get_le16(pb);
310 get_le16(pb); //ds_data_size
311 get_byte(pb); //ds_silence_data
312 }
313 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
314 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
315 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
316 if (asf_st->ds_span > 1) {
317 if (!asf_st->ds_chunk_size
318 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
319 || asf_st->ds_packet_size % asf_st->ds_chunk_size)
320 asf_st->ds_span = 0; // disable descrambling
321 }
322 switch (st->codec->codec_id) {
323 case CODEC_ID_MP3:
324 st->codec->frame_size = MPA_FRAME_SIZE;
325 break;
326 case CODEC_ID_PCM_S16LE:
327 case CODEC_ID_PCM_S16BE:
328 case CODEC_ID_PCM_U16LE:
329 case CODEC_ID_PCM_U16BE:
330 case CODEC_ID_PCM_S8:
331 case CODEC_ID_PCM_U8:
332 case CODEC_ID_PCM_ALAW:
333 case CODEC_ID_PCM_MULAW:
334 st->codec->frame_size = 1;
335 break;
336 default:
337 /* This is probably wrong, but it prevents a crash later */
338 st->codec->frame_size = 1;
339 break;
340 }
341 } else if (type == CODEC_TYPE_VIDEO) {
342 get_le32(pb);
343 get_le32(pb);
344 get_byte(pb);
345 size = get_le16(pb); /* size */
346 sizeX= get_le32(pb); /* size */
347 st->codec->width = get_le32(pb);
348 st->codec->height = get_le32(pb);
349 /* not available for asf */
350 get_le16(pb); /* panes */
351 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
352 tag1 = get_le32(pb);
353 url_fskip(pb, 20);
354 // av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
355 size= sizeX;
356 if (size > 40) {
357 st->codec->extradata_size = size - 40;
358 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
359 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
360 }
361
362 /* Extract palette from extradata if bpp <= 8 */
363 /* This code assumes that extradata contains only palette */
364 /* This is true for all paletted codecs implemented in ffmpeg */
365 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
366 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
367 #if HAVE_BIGENDIAN
368 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
369 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
370 #else
371 memcpy(st->codec->palctrl->palette, st->codec->extradata,
372 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
373 #endif
374 st->codec->palctrl->palette_changed = 1;
375 }
376
377 st->codec->codec_tag = tag1;
378 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
379 if(tag1 == MKTAG('D', 'V', 'R', ' '))
380 st->need_parsing = AVSTREAM_PARSE_FULL;
381 }
382 pos2 = url_ftell(pb);
383 url_fskip(pb, gsize - (pos2 - pos1 + 24));
384 } else if (!guidcmp(&g, &ff_asf_comment_header)) {
385 int len1, len2, len3, len4, len5;
386
387 len1 = get_le16(pb);
388 len2 = get_le16(pb);
389 len3 = get_le16(pb);
390 len4 = get_le16(pb);
391 len5 = get_le16(pb);
392 get_tag(s, "title" , 0, len1);
393 get_tag(s, "author" , 0, len2);
394 get_tag(s, "copyright", 0, len3);
395 get_tag(s, "comment" , 0, len4);
396 url_fskip(pb, len5);
397 } else if (!guidcmp(&g, &stream_bitrate_guid)) {
398 int stream_count = get_le16(pb);
399 int j;
400
401 // av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
402 // av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
403 for(j = 0; j < stream_count; j++) {
404 int flags, bitrate, stream_id;
405
406 flags= get_le16(pb);
407 bitrate= get_le32(pb);
408 stream_id= (flags & 0x7f);
409 // av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
410 asf->stream_bitrates[stream_id]= bitrate;
411 }
412 } else if (!guidcmp(&g, &ff_asf_language_guid)) {
413 int j;
414 int stream_count = get_le16(pb);
415 for(j = 0; j < stream_count; j++) {
416 char lang[6];
417 unsigned int lang_len = get_byte(pb);
418 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
419 if (j < 128)
420 av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
421 }
422 } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
423 int desc_count, i;
424
425 desc_count = get_le16(pb);
426 for(i=0;i<desc_count;i++) {
427 int name_len,value_type,value_len;
428 char name[1024];
429
430 name_len = get_le16(pb);
431 get_str16_nolen(pb, name_len, name, sizeof(name));
432 value_type = get_le16(pb);
433 value_len = get_le16(pb);
434 get_tag(s, name, value_type, value_len);
435 }
436 } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
437 int n, stream_num, name_len, value_len, value_type, value_num;
438 n = get_le16(pb);
439
440 for(i=0;i<n;i++) {
441 char name[1024];
442
443 get_le16(pb); //lang_list_index
444 stream_num= get_le16(pb);
445 name_len= get_le16(pb);
446 value_type= get_le16(pb);
447 value_len= get_le32(pb);
448
449 get_str16_nolen(pb, name_len, name, sizeof(name));
450 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
451 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
452 url_fskip(pb, value_len - 2);
453
454 if(stream_num<128){
455 if (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
456 else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
457 }
458 }
459 } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
460 int ext_len, payload_ext_ct, stream_ct;
461 uint32_t ext_d, leak_rate, stream_num;
462 unsigned int stream_languageid_index;
463
464 get_le64(pb); // starttime
465 get_le64(pb); // endtime
466 leak_rate = get_le32(pb); // leak-datarate
467 get_le32(pb); // bucket-datasize
468 get_le32(pb); // init-bucket-fullness
469 get_le32(pb); // alt-leak-datarate
470 get_le32(pb); // alt-bucket-datasize
471 get_le32(pb); // alt-init-bucket-fullness
472 get_le32(pb); // max-object-size
473 get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
474 stream_num = get_le16(pb); // stream-num
475
476 stream_languageid_index = get_le16(pb); // stream-language-id-index
477 if (stream_num < 128)
478 asf->streams[stream_num].stream_language_index = stream_languageid_index;
479
480 get_le64(pb); // avg frametime in 100ns units
481 stream_ct = get_le16(pb); //stream-name-count
482 payload_ext_ct = get_le16(pb); //payload-extension-system-count
483
484 if (stream_num < 128)
485 bitrate[stream_num] = leak_rate;
486
487 for (i=0; i<stream_ct; i++){
488 get_le16(pb);
489 ext_len = get_le16(pb);
490 url_fseek(pb, ext_len, SEEK_CUR);
491 }
492
493 for (i=0; i<payload_ext_ct; i++){
494 get_guid(pb, &g);
495 ext_d=get_le16(pb);
496 ext_len=get_le32(pb);
497 url_fseek(pb, ext_len, SEEK_CUR);
498 }
499
500 // there could be a optional stream properties object to follow
501 // if so the next iteration will pick it up
502 } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
503 int v1, v2;
504 get_guid(pb, &g);
505 v1 = get_le32(pb);
506 v2 = get_le16(pb);
507 #if 0
508 } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
509 int len, v1, n, num;
510 char str[256], *q;
511 char tag[16];
512
513 get_guid(pb, &g);
514 print_guid(&g);
515
516 n = get_le32(pb);
517 for(i=0;i<n;i++) {
518 num = get_le16(pb); /* stream number */
519 get_str16(pb, str, sizeof(str));
520 get_str16(pb, str, sizeof(str));
521 len = get_le16(pb);
522 q = tag;
523 while (len > 0) {
524 v1 = get_byte(pb);
525 if ((q - tag) < sizeof(tag) - 1)
526 *q++ = v1;
527 len--;
528 }
529 *q = '\0';
530 }
531 #endif
532 } else if (url_feof(pb)) {
533 return -1;
534 } else {
535 if (!s->keylen) {
536 if (!guidcmp(&g, &ff_asf_content_encryption)) {
537 av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
538 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
539 av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
540 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
541 av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
542 }
543 }
544 url_fseek(pb, gsize - 24, SEEK_CUR);
545 }
546 }
547 get_guid(pb, &g);
548 get_le64(pb);
549 get_byte(pb);
550 get_byte(pb);
551 if (url_feof(pb))
552 return -1;
553 asf->data_offset = url_ftell(pb);
554 asf->packet_size_left = 0;
555
556
557 for(i=0; i<128; i++){
558 int stream_num= asf->asfid2avid[i];
559 if(stream_num>=0){
560 AVStream *st = s->streams[stream_num];
561 if (!st->codec->bit_rate)
562 st->codec->bit_rate = bitrate[i];
563 if (dar[i].num > 0 && dar[i].den > 0)
564 av_reduce(&st->sample_aspect_ratio.num,
565 &st->sample_aspect_ratio.den,
566 dar[i].num, dar[i].den, INT_MAX);
567 //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);
568
569 // copy and convert language codes to the frontend
570 if (asf->streams[i].stream_language_index < 128) {
571 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
572 if (rfc1766 && strlen(rfc1766) > 1) {
573 const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
574 const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
575 if (iso6392)
576 av_metadata_set(&st->metadata, "language", iso6392);
577 }
578 }
579 }
580 }
581
582 return 0;
583 }
584
585 #define DO_2BITS(bits, var, defval) \
586 switch (bits & 3) \
587 { \
588 case 3: var = get_le32(pb); rsize += 4; break; \
589 case 2: var = get_le16(pb); rsize += 2; break; \
590 case 1: var = get_byte(pb); rsize++; break; \
591 default: var = defval; break; \
592 }
593
594 /**
595 * Load a single ASF packet into the demuxer.
596 * @param s demux context
597 * @param pb context to read data from
598 * @returns 0 on success, <0 on error
599 */
600 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
601 {
602 ASFContext *asf = s->priv_data;
603 uint32_t packet_length, padsize;
604 int rsize = 8;
605 int c, d, e, off;
606
607 // if we do not know packet size, allow skipping up to 32 kB
608 off= 32768;
609 if (s->packet_size > 0)
610 off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
611
612 c=d=e=-1;
613 while(off-- > 0){
614 c=d; d=e;
615 e= get_byte(pb);
616 if(c == 0x82 && !d && !e)
617 break;
618 }
619
620 if (c != 0x82) {
621 /**
622 * This code allows handling of -EAGAIN at packet boundaries (i.e.
623 * if the packet sync code above triggers -EAGAIN). This does not
624 * imply complete -EAGAIN handling support at random positions in
625 * the stream.
626 */
627 if (url_ferror(pb) == AVERROR(EAGAIN))
628 return AVERROR(EAGAIN);
629 if (!url_feof(pb))
630 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
631 }
632 if ((c & 0x8f) == 0x82) {
633 if (d || e) {
634 if (!url_feof(pb))
635 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
636 return -1;
637 }
638 c= get_byte(pb);
639 d= get_byte(pb);
640 rsize+=3;
641 }else{
642 url_fseek(pb, -1, SEEK_CUR); //FIXME
643 }
644
645 asf->packet_flags = c;
646 asf->packet_property = d;
647
648 DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
649 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
650 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
651
652 //the following checks prevent overflows and infinite loops
653 if(!packet_length || packet_length >= (1U<<29)){
654 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
655 return -1;
656 }
657 if(padsize >= packet_length){
658 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
659 return -1;
660 }
661
662 asf->packet_timestamp = get_le32(pb);
663 get_le16(pb); /* duration */
664 // rsize has at least 11 bytes which have to be present
665
666 if (asf->packet_flags & 0x01) {
667 asf->packet_segsizetype = get_byte(pb); rsize++;
668 asf->packet_segments = asf->packet_segsizetype & 0x3f;
669 } else {
670 asf->packet_segments = 1;
671 asf->packet_segsizetype = 0x80;
672 }
673 asf->packet_size_left = packet_length - padsize - rsize;
674 if (packet_length < asf->hdr.min_pktsize)
675 padsize += asf->hdr.min_pktsize - packet_length;
676 asf->packet_padsize = padsize;
677 dprintf(s, "packet: size=%d padsize=%d left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
678 return 0;
679 }
680
681 /**
682 *
683 * @return <0 if error
684 */
685 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
686 ASFContext *asf = s->priv_data;
687 int rsize = 1;
688 int num = get_byte(pb);
689 int64_t ts0, ts1;
690
691 asf->packet_segments--;
692 asf->packet_key_frame = num >> 7;
693 asf->stream_index = asf->asfid2avid[num & 0x7f];
694 // sequence should be ignored!
695 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
696 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
697 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
698 //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);
699 if (asf->packet_replic_size >= 8) {
700 asf->packet_obj_size = get_le32(pb);
701 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
702 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
703 return -1;
704 }
705 asf->packet_frag_timestamp = get_le32(pb); // timestamp
706 if(asf->packet_replic_size >= 8+38+4){
707 // for(i=0; i<asf->packet_replic_size-8; i++)
708 // av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
709 // av_log(s, AV_LOG_DEBUG, "\n");
710 url_fskip(pb, 10);
711 ts0= get_le64(pb);
712 ts1= get_le64(pb);
713 url_fskip(pb, 12);
714 get_le32(pb);
715 url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
716 if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
717 else asf->packet_frag_timestamp= AV_NOPTS_VALUE;
718 }else
719 url_fskip(pb, asf->packet_replic_size - 8);
720 rsize += asf->packet_replic_size; // FIXME - check validity
721 } else if (asf->packet_replic_size==1){
722 // multipacket - frag_offset is beginning timestamp
723 asf->packet_time_start = asf->packet_frag_offset;
724 asf->packet_frag_offset = 0;
725 asf->packet_frag_timestamp = asf->packet_timestamp;
726
727 asf->packet_time_delta = get_byte(pb);
728 rsize++;
729 }else if(asf->packet_replic_size!=0){
730 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
731 return -1;
732 }
733 if (asf->packet_flags & 0x01) {
734 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
735 if(asf->packet_frag_size > asf->packet_size_left - rsize){
736 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
737 return -1;
738 }
739 //printf("Fragsize %d\n", asf->packet_frag_size);
740 } else {
741 asf->packet_frag_size = asf->packet_size_left - rsize;
742 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
743 }
744 if (asf->packet_replic_size == 1) {
745 asf->packet_multi_size = asf->packet_frag_size;
746 if (asf->packet_multi_size > asf->packet_size_left)
747 return -1;
748 }
749 asf->packet_size_left -= rsize;
750 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
751
752 return 0;
753 }
754
755 /**
756 * Parse data from individual ASF packets (which were previously loaded
757 * with asf_get_packet()).
758 * @param s demux context
759 * @param pb context to read data from
760 * @param pkt pointer to store packet data into
761 * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
762 * packets need to be loaded (through asf_get_packet())
763 */
764 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
765 {
766 ASFContext *asf = s->priv_data;
767 ASFStream *asf_st = 0;
768 for (;;) {
769 if(url_feof(pb))
770 return AVERROR_EOF;
771 if (asf->packet_size_left < FRAME_HEADER_SIZE
772 || asf->packet_segments < 1) {
773 //asf->packet_size_left <= asf->packet_padsize) {
774 int ret = asf->packet_size_left + asf->packet_padsize;
775 //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
776 assert(ret>=0);
777 /* fail safe */
778 url_fskip(pb, ret);
779
780 asf->packet_pos= url_ftell(pb);
781 if (asf->data_object_size != (uint64_t)-1 &&
782 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
783 return AVERROR_EOF; /* Do not exceed the size of the data object */
784 return 1;
785 }
786 if (asf->packet_time_start == 0) {
787 if(asf_read_frame_header(s, pb) < 0){
788 asf->packet_segments= 0;
789 continue;
790 }
791 if (asf->stream_index < 0
792 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
793 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
794 ) {
795 asf->packet_time_start = 0;
796 /* unhandled packet (should not happen) */
797 url_fskip(pb, asf->packet_frag_size);
798 asf->packet_size_left -= asf->packet_frag_size;
799 if(asf->stream_index < 0)
800 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
801 continue;
802 }
803 asf->asf_st = s->streams[asf->stream_index]->priv_data;
804 }
805 asf_st = asf->asf_st;
806
807 if (asf->packet_replic_size == 1) {
808 // frag_offset is here used as the beginning timestamp
809 asf->packet_frag_timestamp = asf->packet_time_start;
810 asf->packet_time_start += asf->packet_time_delta;
811 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
812 asf->packet_size_left--;
813 asf->packet_multi_size--;
814 if (asf->packet_multi_size < asf->packet_obj_size)
815 {
816 asf->packet_time_start = 0;
817 url_fskip(pb, asf->packet_multi_size);
818 asf->packet_size_left -= asf->packet_multi_size;
819 continue;
820 }
821 asf->packet_multi_size -= asf->packet_obj_size;
822 //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);
823 }
824 if( /*asf->packet_frag_size == asf->packet_obj_size*/
825 asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
826 && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
827 av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
828 asf_st->frag_offset, asf->packet_frag_size,
829 asf->packet_obj_size, asf_st->pkt.size);
830 asf->packet_obj_size= asf_st->pkt.size;
831 }
832
833 if ( asf_st->pkt.size != asf->packet_obj_size
834 || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
835 if(asf_st->pkt.data){
836 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
837 asf_st->frag_offset = 0;
838 av_free_packet(&asf_st->pkt);
839 }
840 /* new packet */
841 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
842 asf_st->seq = asf->packet_seq;
843 asf_st->pkt.dts = asf->packet_frag_timestamp;
844 asf_st->pkt.stream_index = asf->stream_index;
845 asf_st->pkt.pos =
846 asf_st->packet_pos= asf->packet_pos;
847 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
848 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
849 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
850 if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
851 asf->packet_key_frame = 1;
852 if (asf->packet_key_frame)
853 asf_st->pkt.flags |= PKT_FLAG_KEY;
854 }
855
856 /* read data */
857 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
858 // s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
859 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
860 asf->packet_size_left -= asf->packet_frag_size;
861 if (asf->packet_size_left < 0)
862 continue;
863
864 if( asf->packet_frag_offset >= asf_st->pkt.size
865 || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
866 av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
867 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
868 continue;
869 }
870
871 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
872 asf->packet_frag_size);
873 if (s->key && s->keylen == 20)
874 ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
875 asf->packet_frag_size);
876 asf_st->frag_offset += asf->packet_frag_size;
877 /* test if whole packet is read */
878 if (asf_st->frag_offset == asf_st->pkt.size) {
879 //workaround for macroshit radio DVR-MS files
880 if( s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
881 && asf_st->pkt.size > 100){
882 int i;
883 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
884 if(i == asf_st->pkt.size){
885 av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
886 asf_st->frag_offset = 0;
887 av_free_packet(&asf_st->pkt);
888 continue;
889 }
890 }
891
892 /* return packet */
893 if (asf_st->ds_span > 1) {
894 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
895 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);
896 }else{
897 /* packet descrambling */
898 uint8_t *newdata = av_malloc(asf_st->pkt.size);
899 if (newdata) {
900 int offset = 0;
901 while (offset < asf_st->pkt.size) {
902 int off = offset / asf_st->ds_chunk_size;
903 int row = off / asf_st->ds_span;
904 int col = off % asf_st->ds_span;
905 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
906 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
907
908 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
909 assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
910 memcpy(newdata + offset,
911 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
912 asf_st->ds_chunk_size);
913 offset += asf_st->ds_chunk_size;
914 }
915 av_free(asf_st->pkt.data);
916 asf_st->pkt.data = newdata;
917 }
918 }
919 }
920 asf_st->frag_offset = 0;
921 *pkt= asf_st->pkt;
922 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
923 asf_st->pkt.size = 0;
924 asf_st->pkt.data = 0;
925 break; // packet completed
926 }
927 }
928 return 0;
929 }
930
931 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
932 {
933 ASFContext *asf = s->priv_data;
934
935 for (;;) {
936 int ret;
937
938 /* parse cached packets, if any */
939 if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
940 return ret;
941 if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
942 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
943 asf->packet_time_start = 0;
944 }
945
946 return 0;
947 }
948
949 // Added to support seeking after packets have been read
950 // If information is not reset, read_packet fails due to
951 // leftover information from previous reads
952 static void asf_reset_header(AVFormatContext *s)
953 {
954 ASFContext *asf = s->priv_data;
955 ASFStream *asf_st;
956 int i;
957
958 asf->packet_nb_frames = 0;
959 asf->packet_size_left = 0;
960 asf->packet_segments = 0;
961 asf->packet_flags = 0;
962 asf->packet_property = 0;
963 asf->packet_timestamp = 0;
964 asf->packet_segsizetype = 0;
965 asf->packet_segments = 0;
966 asf->packet_seq = 0;
967 asf->packet_replic_size = 0;
968 asf->packet_key_frame = 0;
969 asf->packet_padsize = 0;
970 asf->packet_frag_offset = 0;
971 asf->packet_frag_size = 0;
972 asf->packet_frag_timestamp = 0;
973 asf->packet_multi_size = 0;
974 asf->packet_obj_size = 0;
975 asf->packet_time_delta = 0;
976 asf->packet_time_start = 0;
977
978 for(i=0; i<s->nb_streams; i++){
979 asf_st= s->streams[i]->priv_data;
980 av_free_packet(&asf_st->pkt);
981 asf_st->frag_offset=0;
982 asf_st->seq=0;
983 }
984 asf->asf_st= NULL;
985 }
986
987 static int asf_read_close(AVFormatContext *s)
988 {
989 int i;
990
991 asf_reset_header(s);
992 for(i=0;i<s->nb_streams;i++) {
993 AVStream *st = s->streams[i];
994 av_free(st->codec->palctrl);
995 }
996 return 0;
997 }
998
999 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1000 {
1001 AVPacket pkt1, *pkt = &pkt1;
1002 ASFStream *asf_st;
1003 int64_t pts;
1004 int64_t pos= *ppos;
1005 int i;
1006 int64_t start_pos[s->nb_streams];
1007
1008 for(i=0; i<s->nb_streams; i++){
1009 start_pos[i]= pos;
1010 }
1011
1012 if (s->packet_size > 0)
1013 pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1014 *ppos= pos;
1015 url_fseek(s->pb, pos, SEEK_SET);
1016
1017 //printf("asf_read_pts\n");
1018 asf_reset_header(s);
1019 for(;;){
1020 if (av_read_frame(s, pkt) < 0){
1021 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1022 return AV_NOPTS_VALUE;
1023 }
1024
1025 pts= pkt->pts;
1026
1027 av_free_packet(pkt);
1028 if(pkt->flags&PKT_FLAG_KEY){
1029 i= pkt->stream_index;
1030
1031 asf_st= s->streams[i]->priv_data;
1032
1033 // assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1034 pos= asf_st->packet_pos;
1035
1036 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1037 start_pos[i]= asf_st->packet_pos + 1;
1038
1039 if(pkt->stream_index == stream_index)
1040 break;
1041 }
1042 }
1043
1044 *ppos= pos;
1045 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1046
1047 return pts;
1048 }
1049
1050 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1051 {
1052 ff_asf_guid g;
1053 ASFContext *asf = s->priv_data;
1054 int64_t current_pos= url_ftell(s->pb);
1055 int i;
1056
1057 url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1058 get_guid(s->pb, &g);
1059 if (!guidcmp(&g, &index_guid)) {
1060 int64_t itime;
1061 int pct, ict;
1062 int64_t av_unused gsize= get_le64(s->pb);
1063 get_guid(s->pb, &g);
1064 itime=get_le64(s->pb);
1065 pct=get_le32(s->pb);
1066 ict=get_le32(s->pb);
1067 av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1068
1069 for (i=0;i<ict;i++){
1070 int pktnum=get_le32(s->pb);
1071 int pktct =get_le16(s->pb);
1072 int64_t pos = s->data_offset + s->packet_size*(int64_t)pktnum;
1073 int64_t index_pts= av_rescale(itime, i, 10000);
1074
1075 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1076 av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1077 }
1078 asf->index_read= 1;
1079 }
1080 url_fseek(s->pb, current_pos, SEEK_SET);
1081 }
1082
1083 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1084 {
1085 ASFContext *asf = s->priv_data;
1086 AVStream *st = s->streams[stream_index];
1087 int64_t pos;
1088 int index;
1089
1090 if (s->packet_size <= 0)
1091 return -1;
1092
1093 /* Try using the protocol's read_seek if available */
1094 if(s->pb) {
1095 int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1096 if(ret >= 0)
1097 asf_reset_header(s);
1098 if (ret != AVERROR(ENOSYS))
1099 return ret;
1100 }
1101
1102 if (!asf->index_read)
1103 asf_build_simple_index(s, stream_index);
1104
1105 if(!(asf->index_read && st->index_entries)){
1106 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1107 return -1;
1108 }else{
1109 index= av_index_search_timestamp(st, pts, flags);
1110 if(index<0)
1111 return -1;
1112
1113 /* find the position */
1114 pos = st->index_entries[index].pos;
1115
1116 // various attempts to find key frame have failed so far
1117 // asf_reset_header(s);
1118 // url_fseek(s->pb, pos, SEEK_SET);
1119 // key_pos = pos;
1120 // for(i=0;i<16;i++){
1121 // pos = url_ftell(s->pb);
1122 // if (av_read_frame(s, &pkt) < 0){
1123 // av_log(s, AV_LOG_INFO, "seek failed\n");
1124 // return -1;
1125 // }
1126 // asf_st = s->streams[stream_index]->priv_data;
1127 // pos += st->parser->frame_offset;
1128 //
1129 // if (pkt.size > b) {
1130 // b = pkt.size;
1131 // key_pos = pos;
1132 // }
1133 //
1134 // av_free_packet(&pkt);
1135 // }
1136
1137 /* do the seek */
1138 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1139 url_fseek(s->pb, pos, SEEK_SET);
1140 }
1141 asf_reset_header(s);
1142 return 0;
1143 }
1144
1145 AVInputFormat asf_demuxer = {
1146 "asf",
1147 NULL_IF_CONFIG_SMALL("ASF format"),
1148 sizeof(ASFContext),
1149 asf_probe,
1150 asf_read_header,
1151 asf_read_packet,
1152 asf_read_close,
1153 asf_read_seek,
1154 asf_read_pts,
1155 .metadata_conv = ff_asf_metadata_conv,
1156 };
ffmpeg Lagarith lossless decoder