3 * Copyright (c) 2009 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavcodec/bytestream.h"
23 #include "libavutil/avstring.h"
24 #include "libavutil/intfloat.h"
31 void ff_amf_write_bool(uint8_t **dst, int val)
33 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
34 bytestream_put_byte(dst, val);
37 void ff_amf_write_number(uint8_t **dst, double val)
39 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
40 bytestream_put_be64(dst, av_double2int(val));
43 void ff_amf_write_string(uint8_t **dst, const char *str)
45 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
46 bytestream_put_be16(dst, strlen(str));
47 bytestream_put_buffer(dst, str, strlen(str));
50 void ff_amf_write_string2(uint8_t **dst, const char *str1, const char *str2)
52 int len1 = 0, len2 = 0;
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);
63 void ff_amf_write_null(uint8_t **dst)
65 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
68 void ff_amf_write_object_start(uint8_t **dst)
70 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
73 void ff_amf_write_field_name(uint8_t **dst, const char *str)
75 bytestream_put_be16(dst, strlen(str));
76 bytestream_put_buffer(dst, str, strlen(str));
79 void ff_amf_write_object_end(uint8_t **dst)
81 /* first two bytes are field name length = 0,
82 * AMF object should end with it and end marker
84 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
87 int ff_amf_read_bool(GetByteContext *bc, int *val)
89 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_BOOL)
90 return AVERROR_INVALIDDATA;
91 *val = bytestream2_get_byte(bc);
95 int ff_amf_read_number(GetByteContext *bc, double *val)
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);
105 int ff_amf_read_string(GetByteContext *bc, uint8_t *str,
106 int strsize, int *length)
110 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)
111 return AVERROR_INVALIDDATA;
112 stringlen = bytestream2_get_be16(bc);
113 if (stringlen + 1 > strsize)
114 return AVERROR(EINVAL);
115 readsize = bytestream2_get_buffer(bc, str, stringlen);
116 if (readsize != stringlen) {
117 av_log(NULL, AV_LOG_WARNING,
118 "Unable to read as many bytes as AMF string signaled\n");
120 str[readsize] = '\0';
121 *length = FFMIN(stringlen, readsize);
125 int ff_amf_read_null(GetByteContext *bc)
127 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)
128 return AVERROR_INVALIDDATA;
132 int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,
137 if (channel < *nb_prev_pkt)
140 nb_alloc = channel + 16;
141 // This can't use the av_reallocp family of functions, since we
142 // would need to free each element in the array before the array
144 ptr = av_realloc_array(*prev_pkt, nb_alloc, sizeof(**prev_pkt));
146 return AVERROR(ENOMEM);
147 memset(ptr + *nb_prev_pkt, 0, (nb_alloc - *nb_prev_pkt) * sizeof(*ptr));
149 *nb_prev_pkt = nb_alloc;
153 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
154 int chunk_size, RTMPPacket **prev_pkt, int *nb_prev_pkt)
158 if (ffurl_read(h, &hdr, 1) != 1)
161 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt,
165 static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,
166 int chunk_size, RTMPPacket **prev_pkt_ptr,
167 int *nb_prev_pkt, uint8_t hdr)
171 int channel_id, timestamp, size;
172 uint32_t ts_field; // non-extended timestamp or delta field
174 enum RTMPPacketType type;
177 RTMPPacket *prev_pkt;
180 channel_id = hdr & 0x3F;
182 if (channel_id < 2) { //special case for channel number >= 64
184 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
186 written += channel_id + 1;
187 channel_id = AV_RL16(buf) + 64;
189 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
192 prev_pkt = *prev_pkt_ptr;
193 size = prev_pkt[channel_id].size;
194 type = prev_pkt[channel_id].type;
195 extra = prev_pkt[channel_id].extra;
197 hdr >>= 6; // header size indicator
198 if (hdr == RTMP_PS_ONEBYTE) {
199 ts_field = prev_pkt[channel_id].ts_field;
201 if (ffurl_read_complete(h, buf, 3) != 3)
204 ts_field = AV_RB24(buf);
205 if (hdr != RTMP_PS_FOURBYTES) {
206 if (ffurl_read_complete(h, buf, 3) != 3)
210 if (ffurl_read_complete(h, buf, 1) != 1)
214 if (hdr == RTMP_PS_TWELVEBYTES) {
215 if (ffurl_read_complete(h, buf, 4) != 4)
218 extra = AV_RL32(buf);
222 if (ts_field == 0xFFFFFF) {
223 if (ffurl_read_complete(h, buf, 4) != 4)
225 timestamp = AV_RB32(buf);
227 timestamp = ts_field;
229 if (hdr != RTMP_PS_TWELVEBYTES)
230 timestamp += prev_pkt[channel_id].timestamp;
232 if (!prev_pkt[channel_id].read) {
233 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
238 prev_pkt[channel_id].ts_field = ts_field;
239 prev_pkt[channel_id].timestamp = timestamp;
241 // previous packet in this channel hasn't completed reading
242 RTMPPacket *prev = &prev_pkt[channel_id];
243 p->data = prev->data;
244 p->size = prev->size;
245 p->channel_id = prev->channel_id;
246 p->type = prev->type;
247 p->ts_field = prev->ts_field;
248 p->extra = prev->extra;
249 p->offset = prev->offset;
250 p->read = prev->read + written;
251 p->timestamp = prev->timestamp;
256 prev_pkt[channel_id].channel_id = channel_id;
257 prev_pkt[channel_id].type = type;
258 prev_pkt[channel_id].size = size;
259 prev_pkt[channel_id].extra = extra;
260 size = size - p->offset;
262 toread = FFMIN(size, chunk_size);
263 if (ffurl_read_complete(h, p->data + p->offset, toread) != toread) {
264 ff_rtmp_packet_destroy(p);
272 RTMPPacket *prev = &prev_pkt[channel_id];
273 prev->data = p->data;
274 prev->read = p->read;
275 prev->offset = p->offset;
277 return AVERROR(EAGAIN);
280 prev_pkt[channel_id].read = 0; // read complete; reset if needed
284 int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
285 RTMPPacket **prev_pkt, int *nb_prev_pkt,
289 int ret = rtmp_packet_read_one_chunk(h, p, chunk_size, prev_pkt,
291 if (ret > 0 || ret != AVERROR(EAGAIN))
294 if (ffurl_read(h, &hdr, 1) != 1)
299 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
300 int chunk_size, RTMPPacket **prev_pkt_ptr,
303 uint8_t pkt_hdr[16], *p = pkt_hdr;
304 int mode = RTMP_PS_TWELVEBYTES;
308 RTMPPacket *prev_pkt;
309 int use_delta; // flag if using timestamp delta, not RTMP_PS_TWELVEBYTES
310 uint32_t timestamp; // full 32-bit timestamp or delta value
312 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
313 pkt->channel_id)) < 0)
315 prev_pkt = *prev_pkt_ptr;
317 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
318 use_delta = prev_pkt[pkt->channel_id].channel_id &&
319 pkt->extra == prev_pkt[pkt->channel_id].extra &&
320 pkt->timestamp >= prev_pkt[pkt->channel_id].timestamp;
322 timestamp = pkt->timestamp;
324 timestamp -= prev_pkt[pkt->channel_id].timestamp;
326 if (timestamp >= 0xFFFFFF) {
327 pkt->ts_field = 0xFFFFFF;
329 pkt->ts_field = timestamp;
333 if (pkt->type == prev_pkt[pkt->channel_id].type &&
334 pkt->size == prev_pkt[pkt->channel_id].size) {
335 mode = RTMP_PS_FOURBYTES;
336 if (pkt->ts_field == prev_pkt[pkt->channel_id].ts_field)
337 mode = RTMP_PS_ONEBYTE;
339 mode = RTMP_PS_EIGHTBYTES;
343 if (pkt->channel_id < 64) {
344 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
345 } else if (pkt->channel_id < 64 + 256) {
346 bytestream_put_byte(&p, 0 | (mode << 6));
347 bytestream_put_byte(&p, pkt->channel_id - 64);
349 bytestream_put_byte(&p, 1 | (mode << 6));
350 bytestream_put_le16(&p, pkt->channel_id - 64);
352 if (mode != RTMP_PS_ONEBYTE) {
353 bytestream_put_be24(&p, pkt->ts_field);
354 if (mode != RTMP_PS_FOURBYTES) {
355 bytestream_put_be24(&p, pkt->size);
356 bytestream_put_byte(&p, pkt->type);
357 if (mode == RTMP_PS_TWELVEBYTES)
358 bytestream_put_le32(&p, pkt->extra);
361 if (pkt->ts_field == 0xFFFFFF)
362 bytestream_put_be32(&p, timestamp);
364 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
365 prev_pkt[pkt->channel_id].type = pkt->type;
366 prev_pkt[pkt->channel_id].size = pkt->size;
367 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
368 prev_pkt[pkt->channel_id].ts_field = pkt->ts_field;
369 prev_pkt[pkt->channel_id].extra = pkt->extra;
371 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
373 written = p - pkt_hdr + pkt->size;
374 while (off < pkt->size) {
375 int towrite = FFMIN(chunk_size, pkt->size - off);
376 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
379 if (off < pkt->size) {
380 uint8_t marker = 0xC0 | pkt->channel_id;
381 if ((ret = ffurl_write(h, &marker, 1)) < 0)
389 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
390 int timestamp, int size)
393 pkt->data = av_malloc(size);
395 return AVERROR(ENOMEM);
398 pkt->channel_id = channel_id;
400 pkt->timestamp = timestamp;
407 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
411 av_freep(&pkt->data);
415 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
417 const uint8_t *base = data;
422 if (data >= data_end)
424 switch ((type = *data++)) {
425 case AMF_DATA_TYPE_NUMBER: return 9;
426 case AMF_DATA_TYPE_BOOL: return 2;
427 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
428 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
429 case AMF_DATA_TYPE_NULL: return 1;
430 case AMF_DATA_TYPE_ARRAY:
432 case AMF_DATA_TYPE_MIXEDARRAY:
433 nb = bytestream_get_be32(&data);
434 case AMF_DATA_TYPE_OBJECT:
435 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
438 int size = bytestream_get_be16(&data);
443 if (size < 0 || size >= data_end - data)
447 t = ff_amf_tag_size(data, data_end);
448 if (t < 0 || t >= data_end - data)
453 case AMF_DATA_TYPE_OBJECT_END: return 1;
458 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
459 const uint8_t *name, uint8_t *dst, int dst_size)
461 int namelen = strlen(name);
464 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
465 len = ff_amf_tag_size(data, data_end);
467 len = data_end - data;
470 if (data_end - data < 3)
474 int size = bytestream_get_be16(&data);
477 if (size < 0 || size >= data_end - data)
480 if (size == namelen && !memcmp(data-size, name, namelen)) {
482 case AMF_DATA_TYPE_NUMBER:
483 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
485 case AMF_DATA_TYPE_BOOL:
486 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
488 case AMF_DATA_TYPE_STRING:
489 len = bytestream_get_be16(&data);
490 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
497 len = ff_amf_tag_size(data, data_end);
498 if (len < 0 || len >= data_end - data)
505 static const char* rtmp_packet_type(int type)
508 case RTMP_PT_CHUNK_SIZE: return "chunk size";
509 case RTMP_PT_BYTES_READ: return "bytes read";
510 case RTMP_PT_PING: return "ping";
511 case RTMP_PT_SERVER_BW: return "server bandwidth";
512 case RTMP_PT_CLIENT_BW: return "client bandwidth";
513 case RTMP_PT_AUDIO: return "audio packet";
514 case RTMP_PT_VIDEO: return "video packet";
515 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
516 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
517 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
518 case RTMP_PT_NOTIFY: return "notification";
519 case RTMP_PT_SHARED_OBJ: return "shared object";
520 case RTMP_PT_INVOKE: return "invoke";
521 case RTMP_PT_METADATA: return "metadata";
522 default: return "unknown";
526 static void amf_tag_contents(void *ctx, const uint8_t *data,
527 const uint8_t *data_end)
529 unsigned int size, nb = -1;
534 if (data >= data_end)
536 switch ((type = *data++)) {
537 case AMF_DATA_TYPE_NUMBER:
538 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
540 case AMF_DATA_TYPE_BOOL:
541 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
543 case AMF_DATA_TYPE_STRING:
544 case AMF_DATA_TYPE_LONG_STRING:
545 if (type == AMF_DATA_TYPE_STRING) {
546 size = bytestream_get_be16(&data);
548 size = bytestream_get_be32(&data);
550 size = FFMIN(size, sizeof(buf) - 1);
551 memcpy(buf, data, size);
553 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
555 case AMF_DATA_TYPE_NULL:
556 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
558 case AMF_DATA_TYPE_ARRAY:
560 case AMF_DATA_TYPE_MIXEDARRAY:
561 nb = bytestream_get_be32(&data);
562 case AMF_DATA_TYPE_OBJECT:
563 av_log(ctx, AV_LOG_DEBUG, " {\n");
564 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
567 size = bytestream_get_be16(&data);
568 size = FFMIN(size, sizeof(buf) - 1);
570 av_log(ctx, AV_LOG_DEBUG, " }\n");
574 memcpy(buf, data, size);
576 if (size >= data_end - data)
579 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
581 amf_tag_contents(ctx, data, data_end);
582 t = ff_amf_tag_size(data, data_end);
583 if (t < 0 || t >= data_end - data)
588 case AMF_DATA_TYPE_OBJECT_END:
589 av_log(ctx, AV_LOG_DEBUG, " }\n");
596 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
598 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
599 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->size);
600 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
601 uint8_t *src = p->data, *src_end = p->data + p->size;
602 while (src < src_end) {
604 amf_tag_contents(ctx, src, src_end);
605 sz = ff_amf_tag_size(src, src_end);
610 } else if (p->type == RTMP_PT_SERVER_BW){
611 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
612 } else if (p->type == RTMP_PT_CLIENT_BW){
613 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
614 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
616 for (i = 0; i < p->size; i++)
617 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
618 av_log(ctx, AV_LOG_DEBUG, "\n");
622 int ff_amf_match_string(const uint8_t *data, int size, const char *str)
624 int len = strlen(str);
632 if (type != AMF_DATA_TYPE_LONG_STRING &&
633 type != AMF_DATA_TYPE_STRING)
636 if (type == AMF_DATA_TYPE_LONG_STRING) {
637 if ((size -= 4 + 1) < 0)
639 amf_len = bytestream_get_be32(&data);
641 if ((size -= 2 + 1) < 0)
643 amf_len = bytestream_get_be16(&data);
652 return !memcmp(data, str, len);