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path: root/libavformat/rtmppkt.c (plain)
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1/*
2 * RTMP input format
3 * Copyright (c) 2009 Konstantin Shishkov
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 "libavcodec/bytestream.h"
23#include "libavutil/avstring.h"
24#include "libavutil/intfloat.h"
25#include "avformat.h"
26
27#include "rtmppkt.h"
28#include "flv.h"
29#include "url.h"
30
31void ff_amf_write_bool(uint8_t **dst, int val)
32{
33 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
34 bytestream_put_byte(dst, val);
35}
36
37void ff_amf_write_number(uint8_t **dst, double val)
38{
39 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
40 bytestream_put_be64(dst, av_double2int(val));
41}
42
43void ff_amf_write_string(uint8_t **dst, const char *str)
44{
45 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
46 bytestream_put_be16(dst, strlen(str));
47 bytestream_put_buffer(dst, str, strlen(str));
48}
49
50void ff_amf_write_string2(uint8_t **dst, const char *str1, const char *str2)
51{
52 int len1 = 0, len2 = 0;
53 if (str1)
54 len1 = strlen(str1);
55 if (str2)
56 len2 = strlen(str2);
57 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
58 bytestream_put_be16(dst, len1 + len2);
59 bytestream_put_buffer(dst, str1, len1);
60 bytestream_put_buffer(dst, str2, len2);
61}
62
63void ff_amf_write_null(uint8_t **dst)
64{
65 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
66}
67
68void ff_amf_write_object_start(uint8_t **dst)
69{
70 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
71}
72
73void ff_amf_write_field_name(uint8_t **dst, const char *str)
74{
75 bytestream_put_be16(dst, strlen(str));
76 bytestream_put_buffer(dst, str, strlen(str));
77}
78
79void ff_amf_write_object_end(uint8_t **dst)
80{
81 /* first two bytes are field name length = 0,
82 * AMF object should end with it and end marker
83 */
84 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
85}
86
87int ff_amf_read_bool(GetByteContext *bc, int *val)
88{
89 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_BOOL)
90 return AVERROR_INVALIDDATA;
91 *val = bytestream2_get_byte(bc);
92 return 0;
93}
94
95int ff_amf_read_number(GetByteContext *bc, double *val)
96{
97 uint64_t read;
98 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NUMBER)
99 return AVERROR_INVALIDDATA;
100 read = bytestream2_get_be64(bc);
101 *val = av_int2double(read);
102 return 0;
103}
104
105int ff_amf_get_string(GetByteContext *bc, uint8_t *str,
106 int strsize, int *length)
107{
108 int stringlen = 0;
109 int readsize;
110 stringlen = bytestream2_get_be16(bc);
111 if (stringlen + 1 > strsize)
112 return AVERROR(EINVAL);
113 readsize = bytestream2_get_buffer(bc, str, stringlen);
114 if (readsize != stringlen) {
115 av_log(NULL, AV_LOG_WARNING,
116 "Unable to read as many bytes as AMF string signaled\n");
117 }
118 str[readsize] = '\0';
119 *length = FFMIN(stringlen, readsize);
120 return 0;
121}
122
123int ff_amf_read_string(GetByteContext *bc, uint8_t *str,
124 int strsize, int *length)
125{
126 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)
127 return AVERROR_INVALIDDATA;
128 return ff_amf_get_string(bc, str, strsize, length);
129}
130
131int ff_amf_read_null(GetByteContext *bc)
132{
133 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)
134 return AVERROR_INVALIDDATA;
135 return 0;
136}
137
138int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,
139 int channel)
140{
141 int nb_alloc;
142 RTMPPacket *ptr;
143 if (channel < *nb_prev_pkt)
144 return 0;
145
146 nb_alloc = channel + 16;
147 // This can't use the av_reallocp family of functions, since we
148 // would need to free each element in the array before the array
149 // itself is freed.
150 ptr = av_realloc_array(*prev_pkt, nb_alloc, sizeof(**prev_pkt));
151 if (!ptr)
152 return AVERROR(ENOMEM);
153 memset(ptr + *nb_prev_pkt, 0, (nb_alloc - *nb_prev_pkt) * sizeof(*ptr));
154 *prev_pkt = ptr;
155 *nb_prev_pkt = nb_alloc;
156 return 0;
157}
158
159int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
160 int chunk_size, RTMPPacket **prev_pkt, int *nb_prev_pkt)
161{
162 uint8_t hdr;
163
164 if (ffurl_read(h, &hdr, 1) != 1)
165 return AVERROR(EIO);
166
167 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt,
168 nb_prev_pkt, hdr);
169}
170
171static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,
172 int chunk_size, RTMPPacket **prev_pkt_ptr,
173 int *nb_prev_pkt, uint8_t hdr)
174{
175
176 uint8_t buf[16];
177 int channel_id, timestamp, size;
178 uint32_t ts_field; // non-extended timestamp or delta field
179 uint32_t extra = 0;
180 enum RTMPPacketType type;
181 int written = 0;
182 int ret, toread;
183 RTMPPacket *prev_pkt;
184
185 written++;
186 channel_id = hdr & 0x3F;
187
188 if (channel_id < 2) { //special case for channel number >= 64
189 buf[1] = 0;
190 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
191 return AVERROR(EIO);
192 written += channel_id + 1;
193 channel_id = AV_RL16(buf) + 64;
194 }
195 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
196 channel_id)) < 0)
197 return ret;
198 prev_pkt = *prev_pkt_ptr;
199 size = prev_pkt[channel_id].size;
200 type = prev_pkt[channel_id].type;
201 extra = prev_pkt[channel_id].extra;
202
203 hdr >>= 6; // header size indicator
204 if (hdr == RTMP_PS_ONEBYTE) {
205 ts_field = prev_pkt[channel_id].ts_field;
206 } else {
207 if (ffurl_read_complete(h, buf, 3) != 3)
208 return AVERROR(EIO);
209 written += 3;
210 ts_field = AV_RB24(buf);
211 if (hdr != RTMP_PS_FOURBYTES) {
212 if (ffurl_read_complete(h, buf, 3) != 3)
213 return AVERROR(EIO);
214 written += 3;
215 size = AV_RB24(buf);
216 if (ffurl_read_complete(h, buf, 1) != 1)
217 return AVERROR(EIO);
218 written++;
219 type = buf[0];
220 if (hdr == RTMP_PS_TWELVEBYTES) {
221 if (ffurl_read_complete(h, buf, 4) != 4)
222 return AVERROR(EIO);
223 written += 4;
224 extra = AV_RL32(buf);
225 }
226 }
227 }
228 if (ts_field == 0xFFFFFF) {
229 if (ffurl_read_complete(h, buf, 4) != 4)
230 return AVERROR(EIO);
231 timestamp = AV_RB32(buf);
232 } else {
233 timestamp = ts_field;
234 }
235 if (hdr != RTMP_PS_TWELVEBYTES)
236 timestamp += prev_pkt[channel_id].timestamp;
237
238 if (prev_pkt[channel_id].read && size != prev_pkt[channel_id].size) {
239 av_log(NULL, AV_LOG_ERROR, "RTMP packet size mismatch %d != %d\n",
240 size,
241 prev_pkt[channel_id].size);
242 ff_rtmp_packet_destroy(&prev_pkt[channel_id]);
243 prev_pkt[channel_id].read = 0;
244 }
245
246 if (!prev_pkt[channel_id].read) {
247 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
248 size)) < 0)
249 return ret;
250 p->read = written;
251 p->offset = 0;
252 prev_pkt[channel_id].ts_field = ts_field;
253 prev_pkt[channel_id].timestamp = timestamp;
254 } else {
255 // previous packet in this channel hasn't completed reading
256 RTMPPacket *prev = &prev_pkt[channel_id];
257 p->data = prev->data;
258 p->size = prev->size;
259 p->channel_id = prev->channel_id;
260 p->type = prev->type;
261 p->ts_field = prev->ts_field;
262 p->extra = prev->extra;
263 p->offset = prev->offset;
264 p->read = prev->read + written;
265 p->timestamp = prev->timestamp;
266 prev->data = NULL;
267 }
268 p->extra = extra;
269 // save history
270 prev_pkt[channel_id].channel_id = channel_id;
271 prev_pkt[channel_id].type = type;
272 prev_pkt[channel_id].size = size;
273 prev_pkt[channel_id].extra = extra;
274 size = size - p->offset;
275
276 toread = FFMIN(size, chunk_size);
277 if (ffurl_read_complete(h, p->data + p->offset, toread) != toread) {
278 ff_rtmp_packet_destroy(p);
279 return AVERROR(EIO);
280 }
281 size -= toread;
282 p->read += toread;
283 p->offset += toread;
284
285 if (size > 0) {
286 RTMPPacket *prev = &prev_pkt[channel_id];
287 prev->data = p->data;
288 prev->read = p->read;
289 prev->offset = p->offset;
290 p->data = NULL;
291 return AVERROR(EAGAIN);
292 }
293
294 prev_pkt[channel_id].read = 0; // read complete; reset if needed
295 return p->read;
296}
297
298int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
299 RTMPPacket **prev_pkt, int *nb_prev_pkt,
300 uint8_t hdr)
301{
302 while (1) {
303 int ret = rtmp_packet_read_one_chunk(h, p, chunk_size, prev_pkt,
304 nb_prev_pkt, hdr);
305 if (ret > 0 || ret != AVERROR(EAGAIN))
306 return ret;
307
308 if (ffurl_read(h, &hdr, 1) != 1)
309 return AVERROR(EIO);
310 }
311}
312
313int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
314 int chunk_size, RTMPPacket **prev_pkt_ptr,
315 int *nb_prev_pkt)
316{
317 uint8_t pkt_hdr[16], *p = pkt_hdr;
318 int mode = RTMP_PS_TWELVEBYTES;
319 int off = 0;
320 int written = 0;
321 int ret;
322 RTMPPacket *prev_pkt;
323 int use_delta; // flag if using timestamp delta, not RTMP_PS_TWELVEBYTES
324 uint32_t timestamp; // full 32-bit timestamp or delta value
325
326 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
327 pkt->channel_id)) < 0)
328 return ret;
329 prev_pkt = *prev_pkt_ptr;
330
331 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
332 use_delta = prev_pkt[pkt->channel_id].channel_id &&
333 pkt->extra == prev_pkt[pkt->channel_id].extra &&
334 pkt->timestamp >= prev_pkt[pkt->channel_id].timestamp;
335
336 timestamp = pkt->timestamp;
337 if (use_delta) {
338 timestamp -= prev_pkt[pkt->channel_id].timestamp;
339 }
340 if (timestamp >= 0xFFFFFF) {
341 pkt->ts_field = 0xFFFFFF;
342 } else {
343 pkt->ts_field = timestamp;
344 }
345
346 if (use_delta) {
347 if (pkt->type == prev_pkt[pkt->channel_id].type &&
348 pkt->size == prev_pkt[pkt->channel_id].size) {
349 mode = RTMP_PS_FOURBYTES;
350 if (pkt->ts_field == prev_pkt[pkt->channel_id].ts_field)
351 mode = RTMP_PS_ONEBYTE;
352 } else {
353 mode = RTMP_PS_EIGHTBYTES;
354 }
355 }
356
357 if (pkt->channel_id < 64) {
358 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
359 } else if (pkt->channel_id < 64 + 256) {
360 bytestream_put_byte(&p, 0 | (mode << 6));
361 bytestream_put_byte(&p, pkt->channel_id - 64);
362 } else {
363 bytestream_put_byte(&p, 1 | (mode << 6));
364 bytestream_put_le16(&p, pkt->channel_id - 64);
365 }
366 if (mode != RTMP_PS_ONEBYTE) {
367 bytestream_put_be24(&p, pkt->ts_field);
368 if (mode != RTMP_PS_FOURBYTES) {
369 bytestream_put_be24(&p, pkt->size);
370 bytestream_put_byte(&p, pkt->type);
371 if (mode == RTMP_PS_TWELVEBYTES)
372 bytestream_put_le32(&p, pkt->extra);
373 }
374 }
375 if (pkt->ts_field == 0xFFFFFF)
376 bytestream_put_be32(&p, timestamp);
377 // save history
378 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
379 prev_pkt[pkt->channel_id].type = pkt->type;
380 prev_pkt[pkt->channel_id].size = pkt->size;
381 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
382 prev_pkt[pkt->channel_id].ts_field = pkt->ts_field;
383 prev_pkt[pkt->channel_id].extra = pkt->extra;
384
385 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
386 return ret;
387 written = p - pkt_hdr + pkt->size;
388 while (off < pkt->size) {
389 int towrite = FFMIN(chunk_size, pkt->size - off);
390 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
391 return ret;
392 off += towrite;
393 if (off < pkt->size) {
394 uint8_t marker = 0xC0 | pkt->channel_id;
395 if ((ret = ffurl_write(h, &marker, 1)) < 0)
396 return ret;
397 written++;
398 if (pkt->ts_field == 0xFFFFFF) {
399 uint8_t ts_header[4];
400 AV_WB32(ts_header, timestamp);
401 if ((ret = ffurl_write(h, ts_header, 4)) < 0)
402 return ret;
403 written += 4;
404 }
405 }
406 }
407 return written;
408}
409
410int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
411 int timestamp, int size)
412{
413 if (size) {
414 pkt->data = av_realloc(NULL, size);
415 if (!pkt->data)
416 return AVERROR(ENOMEM);
417 }
418 pkt->size = size;
419 pkt->channel_id = channel_id;
420 pkt->type = type;
421 pkt->timestamp = timestamp;
422 pkt->extra = 0;
423 pkt->ts_field = 0;
424
425 return 0;
426}
427
428void ff_rtmp_packet_destroy(RTMPPacket *pkt)
429{
430 if (!pkt)
431 return;
432 av_freep(&pkt->data);
433 pkt->size = 0;
434}
435
436int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
437{
438 const uint8_t *base = data;
439 AMFDataType type;
440 unsigned nb = -1;
441 int parse_key = 1;
442
443 if (data >= data_end)
444 return -1;
445 switch ((type = *data++)) {
446 case AMF_DATA_TYPE_NUMBER: return 9;
447 case AMF_DATA_TYPE_BOOL: return 2;
448 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
449 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
450 case AMF_DATA_TYPE_NULL: return 1;
451 case AMF_DATA_TYPE_DATE: return 11;
452 case AMF_DATA_TYPE_ARRAY:
453 parse_key = 0;
454 case AMF_DATA_TYPE_MIXEDARRAY:
455 nb = bytestream_get_be32(&data);
456 case AMF_DATA_TYPE_OBJECT:
457 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
458 int t;
459 if (parse_key) {
460 int size = bytestream_get_be16(&data);
461 if (!size) {
462 data++;
463 break;
464 }
465 if (size < 0 || size >= data_end - data)
466 return -1;
467 data += size;
468 }
469 t = ff_amf_tag_size(data, data_end);
470 if (t < 0 || t >= data_end - data)
471 return -1;
472 data += t;
473 }
474 return data - base;
475 case AMF_DATA_TYPE_OBJECT_END: return 1;
476 default: return -1;
477 }
478}
479
480int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
481 const uint8_t *name, uint8_t *dst, int dst_size)
482{
483 int namelen = strlen(name);
484 int len;
485
486 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
487 len = ff_amf_tag_size(data, data_end);
488 if (len < 0)
489 len = data_end - data;
490 data += len;
491 }
492 if (data_end - data < 3)
493 return -1;
494 data++;
495 for (;;) {
496 int size = bytestream_get_be16(&data);
497 if (!size)
498 break;
499 if (size < 0 || size >= data_end - data)
500 return -1;
501 data += size;
502 if (size == namelen && !memcmp(data-size, name, namelen)) {
503 switch (*data++) {
504 case AMF_DATA_TYPE_NUMBER:
505 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
506 break;
507 case AMF_DATA_TYPE_BOOL:
508 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
509 break;
510 case AMF_DATA_TYPE_STRING:
511 len = bytestream_get_be16(&data);
512 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
513 break;
514 default:
515 return -1;
516 }
517 return 0;
518 }
519 len = ff_amf_tag_size(data, data_end);
520 if (len < 0 || len >= data_end - data)
521 return -1;
522 data += len;
523 }
524 return -1;
525}
526
527static const char* rtmp_packet_type(int type)
528{
529 switch (type) {
530 case RTMP_PT_CHUNK_SIZE: return "chunk size";
531 case RTMP_PT_BYTES_READ: return "bytes read";
532 case RTMP_PT_PING: return "ping";
533 case RTMP_PT_SERVER_BW: return "server bandwidth";
534 case RTMP_PT_CLIENT_BW: return "client bandwidth";
535 case RTMP_PT_AUDIO: return "audio packet";
536 case RTMP_PT_VIDEO: return "video packet";
537 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
538 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
539 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
540 case RTMP_PT_NOTIFY: return "notification";
541 case RTMP_PT_SHARED_OBJ: return "shared object";
542 case RTMP_PT_INVOKE: return "invoke";
543 case RTMP_PT_METADATA: return "metadata";
544 default: return "unknown";
545 }
546}
547
548static void amf_tag_contents(void *ctx, const uint8_t *data,
549 const uint8_t *data_end)
550{
551 unsigned int size, nb = -1;
552 char buf[1024];
553 AMFDataType type;
554 int parse_key = 1;
555
556 if (data >= data_end)
557 return;
558 switch ((type = *data++)) {
559 case AMF_DATA_TYPE_NUMBER:
560 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
561 return;
562 case AMF_DATA_TYPE_BOOL:
563 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
564 return;
565 case AMF_DATA_TYPE_STRING:
566 case AMF_DATA_TYPE_LONG_STRING:
567 if (type == AMF_DATA_TYPE_STRING) {
568 size = bytestream_get_be16(&data);
569 } else {
570 size = bytestream_get_be32(&data);
571 }
572 size = FFMIN(size, sizeof(buf) - 1);
573 memcpy(buf, data, size);
574 buf[size] = 0;
575 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
576 return;
577 case AMF_DATA_TYPE_NULL:
578 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
579 return;
580 case AMF_DATA_TYPE_ARRAY:
581 parse_key = 0;
582 case AMF_DATA_TYPE_MIXEDARRAY:
583 nb = bytestream_get_be32(&data);
584 case AMF_DATA_TYPE_OBJECT:
585 av_log(ctx, AV_LOG_DEBUG, " {\n");
586 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
587 int t;
588 if (parse_key) {
589 size = bytestream_get_be16(&data);
590 size = FFMIN(size, sizeof(buf) - 1);
591 if (!size) {
592 av_log(ctx, AV_LOG_DEBUG, " }\n");
593 data++;
594 break;
595 }
596 memcpy(buf, data, size);
597 buf[size] = 0;
598 if (size >= data_end - data)
599 return;
600 data += size;
601 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
602 }
603 amf_tag_contents(ctx, data, data_end);
604 t = ff_amf_tag_size(data, data_end);
605 if (t < 0 || t >= data_end - data)
606 return;
607 data += t;
608 }
609 return;
610 case AMF_DATA_TYPE_OBJECT_END:
611 av_log(ctx, AV_LOG_DEBUG, " }\n");
612 return;
613 default:
614 return;
615 }
616}
617
618void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
619{
620 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
621 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->size);
622 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
623 uint8_t *src = p->data, *src_end = p->data + p->size;
624 while (src < src_end) {
625 int sz;
626 amf_tag_contents(ctx, src, src_end);
627 sz = ff_amf_tag_size(src, src_end);
628 if (sz < 0)
629 break;
630 src += sz;
631 }
632 } else if (p->type == RTMP_PT_SERVER_BW){
633 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
634 } else if (p->type == RTMP_PT_CLIENT_BW){
635 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
636 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
637 int i;
638 for (i = 0; i < p->size; i++)
639 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
640 av_log(ctx, AV_LOG_DEBUG, "\n");
641 }
642}
643
644int ff_amf_match_string(const uint8_t *data, int size, const char *str)
645{
646 int len = strlen(str);
647 int amf_len, type;
648
649 if (size < 1)
650 return 0;
651
652 type = *data++;
653
654 if (type != AMF_DATA_TYPE_LONG_STRING &&
655 type != AMF_DATA_TYPE_STRING)
656 return 0;
657
658 if (type == AMF_DATA_TYPE_LONG_STRING) {
659 if ((size -= 4 + 1) < 0)
660 return 0;
661 amf_len = bytestream_get_be32(&data);
662 } else {
663 if ((size -= 2 + 1) < 0)
664 return 0;
665 amf_len = bytestream_get_be16(&data);
666 }
667
668 if (amf_len > size)
669 return 0;
670
671 if (amf_len != len)
672 return 0;
673
674 return !memcmp(data, str, len);
675}
676
generated by cgit at 2024-05-17 03:25:37 (GMT)