Replace realloc with free+malloc, the previous content of the buffer is
[libav.git] / libavformat / rmdec.c
1 /*
2 * "Real" 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 "rm.h"
23 #include "avstring.h"
24
25 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
26 {
27 int i;
28 char *q, r;
29
30 q = buf;
31 for(i=0;i<len;i++) {
32 r = get_byte(pb);
33 if (i < buf_size - 1)
34 *q++ = r;
35 }
36 if (buf_size > 0) *q = '\0';
37 }
38
39 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
40 {
41 get_strl(pb, buf, buf_size, get_be16(pb));
42 }
43
44 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
45 {
46 get_strl(pb, buf, buf_size, get_byte(pb));
47 }
48
49 static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
50 int read_all)
51 {
52 RMContext *rm = s->priv_data;
53 ByteIOContext *pb = &s->pb;
54 char buf[256];
55 uint32_t version;
56 int i;
57
58 /* ra type header */
59 version = get_be32(pb); /* version */
60 if (((version >> 16) & 0xff) == 3) {
61 int64_t startpos = url_ftell(pb);
62 /* very old version */
63 for(i = 0; i < 14; i++)
64 get_byte(pb);
65 get_str8(pb, s->title, sizeof(s->title));
66 get_str8(pb, s->author, sizeof(s->author));
67 get_str8(pb, s->copyright, sizeof(s->copyright));
68 get_str8(pb, s->comment, sizeof(s->comment));
69 if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
70 // fourcc (should always be "lpcJ")
71 get_byte(pb);
72 get_str8(pb, buf, sizeof(buf));
73 }
74 // Skip extra header crap (this should never happen)
75 if ((startpos + (version & 0xffff)) > url_ftell(pb))
76 url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
77 st->codec->sample_rate = 8000;
78 st->codec->channels = 1;
79 st->codec->codec_type = CODEC_TYPE_AUDIO;
80 st->codec->codec_id = CODEC_ID_RA_144;
81 } else {
82 int flavor, sub_packet_h, coded_framesize, sub_packet_size;
83 /* old version (4) */
84 get_be32(pb); /* .ra4 */
85 get_be32(pb); /* data size */
86 get_be16(pb); /* version2 */
87 get_be32(pb); /* header size */
88 flavor= get_be16(pb); /* add codec info / flavor */
89 rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
90 get_be32(pb); /* ??? */
91 get_be32(pb); /* ??? */
92 get_be32(pb); /* ??? */
93 rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
94 st->codec->block_align= get_be16(pb); /* frame size */
95 rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
96 get_be16(pb); /* ??? */
97 if (((version >> 16) & 0xff) == 5) {
98 get_be16(pb); get_be16(pb); get_be16(pb); }
99 st->codec->sample_rate = get_be16(pb);
100 get_be32(pb);
101 st->codec->channels = get_be16(pb);
102 if (((version >> 16) & 0xff) == 5) {
103 get_be32(pb);
104 buf[0] = get_byte(pb);
105 buf[1] = get_byte(pb);
106 buf[2] = get_byte(pb);
107 buf[3] = get_byte(pb);
108 buf[4] = 0;
109 } else {
110 get_str8(pb, buf, sizeof(buf)); /* desc */
111 get_str8(pb, buf, sizeof(buf)); /* desc */
112 }
113 st->codec->codec_type = CODEC_TYPE_AUDIO;
114 if (!strcmp(buf, "dnet")) {
115 st->codec->codec_id = CODEC_ID_AC3;
116 st->need_parsing = AVSTREAM_PARSE_FULL;
117 } else if (!strcmp(buf, "28_8")) {
118 st->codec->codec_id = CODEC_ID_RA_288;
119 st->codec->extradata_size= 0;
120 rm->audio_framesize = st->codec->block_align;
121 st->codec->block_align = coded_framesize;
122
123 if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
124 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
125 return -1;
126 }
127
128 rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
129 } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
130 int codecdata_length, i;
131 get_be16(pb); get_byte(pb);
132 if (((version >> 16) & 0xff) == 5)
133 get_byte(pb);
134 codecdata_length = get_be32(pb);
135 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
136 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
137 return -1;
138 }
139
140 if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
141 else st->codec->codec_id = CODEC_ID_ATRAC3;
142 st->codec->extradata_size= codecdata_length;
143 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
144 for(i = 0; i < codecdata_length; i++)
145 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
146 rm->audio_framesize = st->codec->block_align;
147 st->codec->block_align = rm->sub_packet_size;
148
149 if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
150 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
151 return -1;
152 }
153
154 rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
155 } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
156 int codecdata_length, i;
157 get_be16(pb); get_byte(pb);
158 if (((version >> 16) & 0xff) == 5)
159 get_byte(pb);
160 st->codec->codec_id = CODEC_ID_AAC;
161 codecdata_length = get_be32(pb);
162 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
163 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
164 return -1;
165 }
166 if (codecdata_length >= 1) {
167 st->codec->extradata_size = codecdata_length - 1;
168 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
169 get_byte(pb);
170 for(i = 0; i < st->codec->extradata_size; i++)
171 ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
172 }
173 } else {
174 st->codec->codec_id = CODEC_ID_NONE;
175 av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
176 }
177 if (read_all) {
178 get_byte(pb);
179 get_byte(pb);
180 get_byte(pb);
181
182 get_str8(pb, s->title, sizeof(s->title));
183 get_str8(pb, s->author, sizeof(s->author));
184 get_str8(pb, s->copyright, sizeof(s->copyright));
185 get_str8(pb, s->comment, sizeof(s->comment));
186 }
187 }
188 return 0;
189 }
190
191 static int
192 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVStream *st)
193 {
194 ByteIOContext *pb = &s->pb;
195 unsigned int v;
196 int codec_data_size, size;
197 int64_t codec_pos;
198
199 codec_data_size = get_be32(pb);
200 codec_pos = url_ftell(pb);
201 v = get_be32(pb);
202 if (v == MKTAG(0xfd, 'a', 'r', '.')) {
203 /* ra type header */
204 if (rm_read_audio_stream_info(s, st, 0))
205 return -1;
206 } else {
207 int fps, fps2;
208 if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
209 fail1:
210 av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
211 goto skip;
212 }
213 st->codec->codec_tag = get_le32(pb);
214 // av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
215 if ( st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
216 && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
217 && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
218 && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
219 goto fail1;
220 st->codec->width = get_be16(pb);
221 st->codec->height = get_be16(pb);
222 st->codec->time_base.num= 1;
223 fps= get_be16(pb);
224 st->codec->codec_type = CODEC_TYPE_VIDEO;
225 get_be32(pb);
226 fps2= get_be16(pb);
227 get_be16(pb);
228
229 st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
230
231 if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
232 //check is redundant as get_buffer() will catch this
233 av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
234 return -1;
235 }
236 st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
237 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
238
239 // av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
240 st->codec->time_base.den = fps * st->codec->time_base.num;
241 switch(((uint8_t*)st->codec->extradata)[4]>>4){
242 case 1: st->codec->codec_id = CODEC_ID_RV10; break;
243 case 2: st->codec->codec_id = CODEC_ID_RV20; break;
244 case 3: st->codec->codec_id = CODEC_ID_RV30; break;
245 case 4: st->codec->codec_id = CODEC_ID_RV40; break;
246 default: goto fail1;
247 }
248 }
249
250 skip:
251 /* skip codec info */
252 size = url_ftell(pb) - codec_pos;
253 url_fskip(pb, codec_data_size - size);
254
255 return 0;
256 }
257
258
259 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
260 {
261 RMContext *rm = s->priv_data;
262 AVStream *st;
263
264 rm->old_format = 1;
265 st = av_new_stream(s, 0);
266 if (!st)
267 return -1;
268 return rm_read_audio_stream_info(s, st, 1);
269 }
270
271 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
272 {
273 RMContext *rm = s->priv_data;
274 AVStream *st;
275 ByteIOContext *pb = &s->pb;
276 unsigned int tag;
277 int tag_size, i;
278 unsigned int start_time, duration;
279 char buf[128];
280 int flags = 0;
281
282 tag = get_le32(pb);
283 if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
284 /* very old .ra format */
285 return rm_read_header_old(s, ap);
286 } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
287 return AVERROR(EIO);
288 }
289
290 get_be32(pb); /* header size */
291 get_be16(pb);
292 get_be32(pb);
293 get_be32(pb); /* number of headers */
294
295 for(;;) {
296 if (url_feof(pb))
297 goto fail;
298 tag = get_le32(pb);
299 tag_size = get_be32(pb);
300 get_be16(pb);
301 #if 0
302 printf("tag=%c%c%c%c (%08x) size=%d\n",
303 (tag) & 0xff,
304 (tag >> 8) & 0xff,
305 (tag >> 16) & 0xff,
306 (tag >> 24) & 0xff,
307 tag,
308 tag_size);
309 #endif
310 if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
311 goto fail;
312 switch(tag) {
313 case MKTAG('P', 'R', 'O', 'P'):
314 /* file header */
315 get_be32(pb); /* max bit rate */
316 get_be32(pb); /* avg bit rate */
317 get_be32(pb); /* max packet size */
318 get_be32(pb); /* avg packet size */
319 get_be32(pb); /* nb packets */
320 get_be32(pb); /* duration */
321 get_be32(pb); /* preroll */
322 get_be32(pb); /* index offset */
323 get_be32(pb); /* data offset */
324 get_be16(pb); /* nb streams */
325 flags = get_be16(pb); /* flags */
326 break;
327 case MKTAG('C', 'O', 'N', 'T'):
328 get_str16(pb, s->title, sizeof(s->title));
329 get_str16(pb, s->author, sizeof(s->author));
330 get_str16(pb, s->copyright, sizeof(s->copyright));
331 get_str16(pb, s->comment, sizeof(s->comment));
332 break;
333 case MKTAG('M', 'D', 'P', 'R'):
334 st = av_new_stream(s, 0);
335 if (!st)
336 goto fail;
337 st->id = get_be16(pb);
338 get_be32(pb); /* max bit rate */
339 st->codec->bit_rate = get_be32(pb); /* bit rate */
340 get_be32(pb); /* max packet size */
341 get_be32(pb); /* avg packet size */
342 start_time = get_be32(pb); /* start time */
343 get_be32(pb); /* preroll */
344 duration = get_be32(pb); /* duration */
345 st->start_time = start_time;
346 st->duration = duration;
347 get_str8(pb, buf, sizeof(buf)); /* desc */
348 get_str8(pb, buf, sizeof(buf)); /* mimetype */
349 st->codec->codec_type = CODEC_TYPE_DATA;
350 av_set_pts_info(st, 64, 1, 1000);
351 if (ff_rm_read_mdpr_codecdata(s, st) < 0)
352 return -1;
353 break;
354 case MKTAG('D', 'A', 'T', 'A'):
355 goto header_end;
356 default:
357 /* unknown tag: skip it */
358 url_fskip(pb, tag_size - 10);
359 break;
360 }
361 }
362 header_end:
363 rm->nb_packets = get_be32(pb); /* number of packets */
364 if (!rm->nb_packets && (flags & 4))
365 rm->nb_packets = 3600 * 25;
366 get_be32(pb); /* next data header */
367 rm->curpic_num = -1;
368 return 0;
369
370 fail:
371 for(i=0;i<s->nb_streams;i++) {
372 av_free(s->streams[i]);
373 }
374 return AVERROR(EIO);
375 }
376
377 static int get_num(ByteIOContext *pb, int *len)
378 {
379 int n, n1;
380
381 n = get_be16(pb);
382 (*len)-=2;
383 // n &= 0x7FFF;
384 if (n >= 0x4000) {
385 return n - 0x4000;
386 } else {
387 n1 = get_be16(pb);
388 (*len)-=2;
389 return (n << 16) | n1;
390 }
391 }
392
393 /* multiple of 20 bytes for ra144 (ugly) */
394 #define RAW_PACKET_SIZE 1000
395
396 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
397 RMContext *rm = s->priv_data;
398 ByteIOContext *pb = &s->pb;
399 int len, num, res, i;
400 AVStream *st;
401 uint32_t state=0xFFFFFFFF;
402
403 while(!url_feof(pb)){
404 *pos= url_ftell(pb);
405 if(rm->remaining_len > 0){
406 num= rm->current_stream;
407 len= rm->remaining_len;
408 *timestamp = AV_NOPTS_VALUE;
409 *flags= 0;
410 }else{
411 state= (state<<8) + get_byte(pb);
412
413 if(state == MKBETAG('I', 'N', 'D', 'X')){
414 len = get_be16(pb) - 6;
415 if(len<0)
416 continue;
417 goto skip;
418 }
419
420 if(state > (unsigned)0xFFFF || state < 12)
421 continue;
422 len=state;
423 state= 0xFFFFFFFF;
424
425 num = get_be16(pb);
426 *timestamp = get_be32(pb);
427 res= get_byte(pb); /* reserved */
428 *flags = get_byte(pb); /* flags */
429
430
431 len -= 12;
432 }
433 for(i=0;i<s->nb_streams;i++) {
434 st = s->streams[i];
435 if (num == st->id)
436 break;
437 }
438 if (i == s->nb_streams) {
439 skip:
440 /* skip packet if unknown number */
441 url_fskip(pb, len);
442 rm->remaining_len -= len;
443 continue;
444 }
445 *stream_index= i;
446
447 return len;
448 }
449 return -1;
450 }
451
452 static int rm_assemble_video_frame(AVFormatContext *s, RMContext *rm, AVPacket *pkt, int len)
453 {
454 ByteIOContext *pb = &s->pb;
455 int hdr, seq, pic_num, len2, pos;
456 int type;
457
458 hdr = get_byte(pb); len--;
459 type = hdr >> 6;
460 switch(type){
461 case 0: // slice
462 case 2: // last slice
463 seq = get_byte(pb); len--;
464 len2 = get_num(pb, &len);
465 pos = get_num(pb, &len);
466 pic_num = get_byte(pb); len--;
467 rm->remaining_len = len;
468 break;
469 case 1: //whole frame
470 seq = get_byte(pb); len--;
471 if(av_new_packet(pkt, len + 9) < 0)
472 return AVERROR(EIO);
473 pkt->data[0] = 0;
474 AV_WL32(pkt->data + 1, 1);
475 AV_WL32(pkt->data + 5, 0);
476 get_buffer(pb, pkt->data + 9, len);
477 rm->remaining_len = 0;
478 return 0;
479 case 3: //frame as a part of packet
480 len2 = get_num(pb, &len);
481 pos = get_num(pb, &len);
482 pic_num = get_byte(pb); len--;
483 rm->remaining_len = len - len2;
484 if(av_new_packet(pkt, len2 + 9) < 0)
485 return AVERROR(EIO);
486 pkt->data[0] = 0;
487 AV_WL32(pkt->data + 1, 1);
488 AV_WL32(pkt->data + 5, 0);
489 get_buffer(pb, pkt->data + 9, len2);
490 return 0;
491 }
492 //now we have to deal with single slice
493
494 if((seq & 0x7F) == 1 || rm->curpic_num != pic_num){
495 rm->slices = ((hdr & 0x3F) << 1) + 1;
496 rm->videobufsize = len2 + 8*rm->slices + 1;
497 av_free(rm->videobuf);
498 if(!(rm->videobuf = av_malloc(rm->videobufsize)))
499 return AVERROR(ENOMEM);
500 rm->videobufpos = 8*rm->slices + 1;
501 rm->cur_slice = 0;
502 rm->curpic_num = pic_num;
503 rm->pktpos = url_ftell(pb);
504 }
505 if(type == 2)
506 len = FFMIN(len, pos);
507
508 if(++rm->cur_slice > rm->slices)
509 return 1;
510 AV_WL32(rm->videobuf - 7 + 8*rm->cur_slice, 1);
511 AV_WL32(rm->videobuf - 3 + 8*rm->cur_slice, rm->videobufpos - 8*rm->slices - 1);
512 if(rm->videobufpos + len > rm->videobufsize)
513 return 1;
514 if (get_buffer(pb, rm->videobuf + rm->videobufpos, len) != len)
515 return AVERROR(EIO);
516 rm->videobufpos += len,
517 rm->remaining_len-= len;
518
519 if(type == 2 || (rm->videobufpos) == rm->videobufsize){
520 rm->videobuf[0] = rm->cur_slice-1;
521 if(av_new_packet(pkt, rm->videobufpos - 8*(rm->slices - rm->cur_slice)) < 0)
522 return AVERROR(ENOMEM);
523 memcpy(pkt->data, rm->videobuf, 1 + 8*rm->cur_slice);
524 memcpy(pkt->data + 1 + 8*rm->cur_slice, rm->videobuf + 1 + 8*rm->slices,
525 rm->videobufpos - 1 - 8*rm->slices);
526 pkt->pts = AV_NOPTS_VALUE;
527 pkt->pos = rm->pktpos;
528 return 0;
529 }
530
531 return 1;
532 }
533
534 static inline void
535 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
536 {
537 uint8_t *ptr;
538 int j;
539
540 if (st->codec->codec_id == CODEC_ID_AC3) {
541 ptr = pkt->data;
542 for (j=0;j<pkt->size;j+=2) {
543 FFSWAP(int, ptr[0], ptr[1]);
544 ptr += 2;
545 }
546 }
547 }
548
549 static int
550 ff_rm_parse_packet (AVFormatContext *s, AVStream *st, int len, AVPacket *pkt,
551 int *seq, int *flags, int64_t *timestamp)
552 {
553 ByteIOContext *pb = &s->pb;
554 RMContext *rm = s->priv_data;
555
556 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
557 rm->current_stream= st->id;
558 if(rm_assemble_video_frame(s, rm, pkt, len) == 1)
559 return -1; //got partial frame
560 } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
561 if ((st->codec->codec_id == CODEC_ID_RA_288) ||
562 (st->codec->codec_id == CODEC_ID_COOK) ||
563 (st->codec->codec_id == CODEC_ID_ATRAC3)) {
564 int x;
565 int sps = rm->sub_packet_size;
566 int cfs = rm->coded_framesize;
567 int h = rm->sub_packet_h;
568 int y = rm->sub_packet_cnt;
569 int w = rm->audio_framesize;
570
571 if (*flags & 2)
572 y = rm->sub_packet_cnt = 0;
573 if (!y)
574 rm->audiotimestamp = *timestamp;
575
576 switch(st->codec->codec_id) {
577 case CODEC_ID_RA_288:
578 for (x = 0; x < h/2; x++)
579 get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
580 break;
581 case CODEC_ID_ATRAC3:
582 case CODEC_ID_COOK:
583 for (x = 0; x < w/sps; x++)
584 get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
585 break;
586 }
587
588 if (++(rm->sub_packet_cnt) < h)
589 return -1;
590 else {
591 rm->sub_packet_cnt = 0;
592 rm->audio_stream_num = st->index;
593 rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
594 // Release first audio packet
595 av_new_packet(pkt, st->codec->block_align);
596 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
597 *timestamp = rm->audiotimestamp;
598 *flags = 2; // Mark first packet as keyframe
599 }
600 } else if (st->codec->codec_id == CODEC_ID_AAC) {
601 int x;
602 rm->audio_stream_num = st->index;
603 rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
604 if (rm->sub_packet_cnt) {
605 for (x = 0; x < rm->sub_packet_cnt; x++)
606 rm->sub_packet_lengths[x] = get_be16(pb);
607 // Release first audio packet
608 rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
609 av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
610 *flags = 2; // Mark first packet as keyframe
611 }
612 } else
613 av_get_packet(pb, pkt, len);
614 rm_ac3_swap_bytes(st, pkt);
615
616 } else
617 av_get_packet(pb, pkt, len);
618
619 if( (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
620 || st->discard >= AVDISCARD_ALL){
621 av_free_packet(pkt);
622 return -1;
623 }
624
625 pkt->stream_index = st->index;
626
627 #if 0
628 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
629 if(st->codec->codec_id == CODEC_ID_RV20){
630 int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
631 av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
632
633 seq |= (*timestamp&~0x3FFF);
634 if(seq - *timestamp > 0x2000) seq -= 0x4000;
635 if(seq - *timestamp < -0x2000) seq += 0x4000;
636 }
637 }
638 #endif
639
640 pkt->pts= *timestamp;
641 if (*flags & 2)
642 pkt->flags |= PKT_FLAG_KEY;
643
644 return 0;
645 }
646
647 static void
648 ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt)
649 {
650 ByteIOContext *pb = &s->pb;
651 RMContext *rm = s->priv_data;
652
653 assert (rm->audio_pkt_cnt > 0);
654
655 if (st->codec->codec_id == CODEC_ID_AAC)
656 av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
657 else {
658 av_new_packet(pkt, st->codec->block_align);
659 memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
660 (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
661 st->codec->block_align);
662 }
663 rm->audio_pkt_cnt--;
664 pkt->flags = 0;
665 pkt->stream_index = st->index;
666 }
667
668 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
669 {
670 RMContext *rm = s->priv_data;
671 ByteIOContext *pb = &s->pb;
672 AVStream *st;
673 int i, len;
674 int64_t timestamp, pos;
675 int flags;
676
677 if (rm->audio_pkt_cnt) {
678 // If there are queued audio packet return them first
679 st = s->streams[rm->audio_stream_num];
680 ff_rm_retrieve_cache(s, st, pkt);
681 } else if (rm->old_format) {
682 st = s->streams[0];
683 if (st->codec->codec_id == CODEC_ID_RA_288) {
684 int x, y;
685
686 for (y = 0; y < rm->sub_packet_h; y++)
687 for (x = 0; x < rm->sub_packet_h/2; x++)
688 if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
689 return AVERROR(EIO);
690 rm->audio_stream_num = 0;
691 rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
692 // Release first audio packet
693 av_new_packet(pkt, st->codec->block_align);
694 memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
695 pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
696 pkt->stream_index = 0;
697 } else {
698 /* just read raw bytes */
699 len = RAW_PACKET_SIZE;
700 len= av_get_packet(pb, pkt, len);
701 pkt->stream_index = 0;
702 if (len <= 0) {
703 return AVERROR(EIO);
704 }
705 pkt->size = len;
706 }
707 rm_ac3_swap_bytes(st, pkt);
708 } else {
709 int seq=1;
710 resync:
711 len=sync(s, &timestamp, &flags, &i, &pos);
712 if(len<0)
713 return AVERROR(EIO);
714 st = s->streams[i];
715
716 if (ff_rm_parse_packet (s, st, len, pkt, &seq, &flags, &timestamp) < 0)
717 goto resync;
718
719 if(flags&2){
720 if((seq&0x7F) == 1)
721 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
722 }
723 }
724
725 return 0;
726 }
727
728 static int rm_read_close(AVFormatContext *s)
729 {
730 RMContext *rm = s->priv_data;
731
732 av_free(rm->audiobuf);
733 av_free(rm->videobuf);
734 return 0;
735 }
736
737 static int rm_probe(AVProbeData *p)
738 {
739 /* check file header */
740 if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
741 p->buf[2] == 'M' && p->buf[3] == 'F' &&
742 p->buf[4] == 0 && p->buf[5] == 0) ||
743 (p->buf[0] == '.' && p->buf[1] == 'r' &&
744 p->buf[2] == 'a' && p->buf[3] == 0xfd))
745 return AVPROBE_SCORE_MAX;
746 else
747 return 0;
748 }
749
750 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
751 int64_t *ppos, int64_t pos_limit)
752 {
753 RMContext *rm = s->priv_data;
754 int64_t pos, dts;
755 int stream_index2, flags, len, h;
756
757 pos = *ppos;
758
759 if(rm->old_format)
760 return AV_NOPTS_VALUE;
761
762 url_fseek(&s->pb, pos, SEEK_SET);
763 rm->remaining_len=0;
764 for(;;){
765 int seq=1;
766 AVStream *st;
767
768 len=sync(s, &dts, &flags, &stream_index2, &pos);
769 if(len<0)
770 return AV_NOPTS_VALUE;
771
772 st = s->streams[stream_index2];
773 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
774 h= get_byte(&s->pb); len--;
775 if(!(h & 0x40)){
776 seq = get_byte(&s->pb); len--;
777 }
778 }
779
780 if((flags&2) && (seq&0x7F) == 1){
781 // av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
782 av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
783 if(stream_index2 == stream_index)
784 break;
785 }
786
787 url_fskip(&s->pb, len);
788 }
789 *ppos = pos;
790 return dts;
791 }
792
793 AVInputFormat rm_demuxer = {
794 "rm",
795 "rm format",
796 sizeof(RMContext),
797 rm_probe,
798 rm_read_header,
799 rm_read_packet,
800 rm_read_close,
801 NULL,
802 rm_read_dts,
803 };