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_number(GetByteContext *bc, double *val)
90 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NUMBER)
91 return AVERROR_INVALIDDATA;
92 read = bytestream2_get_be64(bc);
93 *val = av_int2double(read);
97 int ff_amf_get_string(GetByteContext *bc, uint8_t *str,
98 int strsize, int *length)
102 stringlen = bytestream2_get_be16(bc);
103 if (stringlen + 1 > strsize)
104 return AVERROR(EINVAL);
105 readsize = bytestream2_get_buffer(bc, str, stringlen);
106 if (readsize != stringlen) {
107 av_log(NULL, AV_LOG_WARNING,
108 "Unable to read as many bytes as AMF string signaled\n");
110 str[readsize] = '\0';
111 *length = FFMIN(stringlen, readsize);
115 int ff_amf_read_string(GetByteContext *bc, uint8_t *str,
116 int strsize, int *length)
118 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)
119 return AVERROR_INVALIDDATA;
120 return ff_amf_get_string(bc, str, strsize, length);
123 int ff_amf_read_null(GetByteContext *bc)
125 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)
126 return AVERROR_INVALIDDATA;
130 int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,
135 if (channel < *nb_prev_pkt)
138 nb_alloc = channel + 16;
139 // This can't use the av_reallocp family of functions, since we
140 // would need to free each element in the array before the array
142 ptr = av_realloc_array(*prev_pkt, nb_alloc, sizeof(**prev_pkt));
144 return AVERROR(ENOMEM);
145 memset(ptr + *nb_prev_pkt, 0, (nb_alloc - *nb_prev_pkt) * sizeof(*ptr));
147 *nb_prev_pkt = nb_alloc;
151 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
152 int chunk_size, RTMPPacket **prev_pkt, int *nb_prev_pkt)
156 if (ffurl_read(h, &hdr, 1) != 1)
159 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt,
163 static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,
164 int chunk_size, RTMPPacket **prev_pkt_ptr,
165 int *nb_prev_pkt, uint8_t hdr)
169 int channel_id, timestamp, size;
170 uint32_t ts_field; // non-extended timestamp or delta field
172 enum RTMPPacketType type;
175 RTMPPacket *prev_pkt;
178 channel_id = hdr & 0x3F;
180 if (channel_id < 2) { //special case for channel number >= 64
182 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
184 written += channel_id + 1;
185 channel_id = AV_RL16(buf) + 64;
187 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
190 prev_pkt = *prev_pkt_ptr;
191 size = prev_pkt[channel_id].size;
192 type = prev_pkt[channel_id].type;
193 extra = prev_pkt[channel_id].extra;
195 hdr >>= 6; // header size indicator
196 if (hdr == RTMP_PS_ONEBYTE) {
197 ts_field = prev_pkt[channel_id].ts_field;
199 if (ffurl_read_complete(h, buf, 3) != 3)
202 ts_field = AV_RB24(buf);
203 if (hdr != RTMP_PS_FOURBYTES) {
204 if (ffurl_read_complete(h, buf, 3) != 3)
208 if (ffurl_read_complete(h, buf, 1) != 1)
212 if (hdr == RTMP_PS_TWELVEBYTES) {
213 if (ffurl_read_complete(h, buf, 4) != 4)
216 extra = AV_RL32(buf);
220 if (ts_field == 0xFFFFFF) {
221 if (ffurl_read_complete(h, buf, 4) != 4)
223 timestamp = AV_RB32(buf);
225 timestamp = ts_field;
227 if (hdr != RTMP_PS_TWELVEBYTES)
228 timestamp += prev_pkt[channel_id].timestamp;
230 if (prev_pkt[channel_id].read && size != prev_pkt[channel_id].size) {
231 av_log(h, AV_LOG_ERROR, "RTMP packet size mismatch %d != %d\n",
232 size, prev_pkt[channel_id].size);
233 ff_rtmp_packet_destroy(&prev_pkt[channel_id]);
234 prev_pkt[channel_id].read = 0;
235 return AVERROR_INVALIDDATA;
238 if (!prev_pkt[channel_id].read) {
239 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
244 prev_pkt[channel_id].ts_field = ts_field;
245 prev_pkt[channel_id].timestamp = timestamp;
247 // previous packet in this channel hasn't completed reading
248 RTMPPacket *prev = &prev_pkt[channel_id];
249 p->data = prev->data;
250 p->size = prev->size;
251 p->channel_id = prev->channel_id;
252 p->type = prev->type;
253 p->ts_field = prev->ts_field;
254 p->extra = prev->extra;
255 p->offset = prev->offset;
256 p->read = prev->read + written;
257 p->timestamp = prev->timestamp;
262 prev_pkt[channel_id].channel_id = channel_id;
263 prev_pkt[channel_id].type = type;
264 prev_pkt[channel_id].size = size;
265 prev_pkt[channel_id].extra = extra;
266 size = size - p->offset;
268 toread = FFMIN(size, chunk_size);
269 if (ffurl_read_complete(h, p->data + p->offset, toread) != toread) {
270 ff_rtmp_packet_destroy(p);
278 RTMPPacket *prev = &prev_pkt[channel_id];
279 prev->data = p->data;
280 prev->read = p->read;
281 prev->offset = p->offset;
283 return AVERROR(EAGAIN);
286 prev_pkt[channel_id].read = 0; // read complete; reset if needed
290 int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
291 RTMPPacket **prev_pkt, int *nb_prev_pkt,
295 int ret = rtmp_packet_read_one_chunk(h, p, chunk_size, prev_pkt,
297 if (ret > 0 || ret != AVERROR(EAGAIN))
300 if (ffurl_read(h, &hdr, 1) != 1)
305 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
306 int chunk_size, RTMPPacket **prev_pkt_ptr,
309 uint8_t pkt_hdr[16], *p = pkt_hdr;
310 int mode = RTMP_PS_TWELVEBYTES;
314 RTMPPacket *prev_pkt;
315 int use_delta; // flag if using timestamp delta, not RTMP_PS_TWELVEBYTES
316 uint32_t timestamp; // full 32-bit timestamp or delta value
318 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
319 pkt->channel_id)) < 0)
321 prev_pkt = *prev_pkt_ptr;
323 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
324 use_delta = prev_pkt[pkt->channel_id].channel_id &&
325 pkt->extra == prev_pkt[pkt->channel_id].extra &&
326 pkt->timestamp >= prev_pkt[pkt->channel_id].timestamp;
328 timestamp = pkt->timestamp;
330 timestamp -= prev_pkt[pkt->channel_id].timestamp;
332 if (timestamp >= 0xFFFFFF) {
333 pkt->ts_field = 0xFFFFFF;
335 pkt->ts_field = timestamp;
339 if (pkt->type == prev_pkt[pkt->channel_id].type &&
340 pkt->size == prev_pkt[pkt->channel_id].size) {
341 mode = RTMP_PS_FOURBYTES;
342 if (pkt->ts_field == prev_pkt[pkt->channel_id].ts_field)
343 mode = RTMP_PS_ONEBYTE;
345 mode = RTMP_PS_EIGHTBYTES;
349 if (pkt->channel_id < 64) {
350 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
351 } else if (pkt->channel_id < 64 + 256) {
352 bytestream_put_byte(&p, 0 | (mode << 6));
353 bytestream_put_byte(&p, pkt->channel_id - 64);
355 bytestream_put_byte(&p, 1 | (mode << 6));
356 bytestream_put_le16(&p, pkt->channel_id - 64);
358 if (mode != RTMP_PS_ONEBYTE) {
359 bytestream_put_be24(&p, pkt->ts_field);
360 if (mode != RTMP_PS_FOURBYTES) {
361 bytestream_put_be24(&p, pkt->size);
362 bytestream_put_byte(&p, pkt->type);
363 if (mode == RTMP_PS_TWELVEBYTES)
364 bytestream_put_le32(&p, pkt->extra);
367 if (pkt->ts_field == 0xFFFFFF)
368 bytestream_put_be32(&p, timestamp);
370 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
371 prev_pkt[pkt->channel_id].type = pkt->type;
372 prev_pkt[pkt->channel_id].size = pkt->size;
373 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
374 prev_pkt[pkt->channel_id].ts_field = pkt->ts_field;
375 prev_pkt[pkt->channel_id].extra = pkt->extra;
377 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
379 written = p - pkt_hdr + pkt->size;
380 while (off < pkt->size) {
381 int towrite = FFMIN(chunk_size, pkt->size - off);
382 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
385 if (off < pkt->size) {
386 uint8_t marker = 0xC0 | pkt->channel_id;
387 if ((ret = ffurl_write(h, &marker, 1)) < 0)
390 if (pkt->ts_field == 0xFFFFFF) {
391 uint8_t ts_header[4];
392 AV_WB32(ts_header, timestamp);
393 if ((ret = ffurl_write(h, ts_header, 4)) < 0)
402 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
403 int timestamp, int size)
406 pkt->data = av_realloc(NULL, size);
408 return AVERROR(ENOMEM);
411 pkt->channel_id = channel_id;
413 pkt->timestamp = timestamp;
420 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
424 av_freep(&pkt->data);
428 static int amf_tag_skip(GetByteContext *gb)
434 if (bytestream2_get_bytes_left(gb) < 1)
437 type = bytestream2_get_byte(gb);
439 case AMF_DATA_TYPE_NUMBER:
440 bytestream2_get_be64(gb);
442 case AMF_DATA_TYPE_BOOL:
443 bytestream2_get_byte(gb);
445 case AMF_DATA_TYPE_STRING:
446 bytestream2_skip(gb, bytestream2_get_be16(gb));
448 case AMF_DATA_TYPE_LONG_STRING:
449 bytestream2_skip(gb, bytestream2_get_be32(gb));
451 case AMF_DATA_TYPE_NULL:
453 case AMF_DATA_TYPE_DATE:
454 bytestream2_skip(gb, 10);
456 case AMF_DATA_TYPE_ARRAY:
458 case AMF_DATA_TYPE_MIXEDARRAY:
459 nb = bytestream2_get_be32(gb);
460 case AMF_DATA_TYPE_OBJECT:
461 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
464 int size = bytestream2_get_be16(gb);
466 bytestream2_get_byte(gb);
469 if (size < 0 || size >= bytestream2_get_bytes_left(gb))
471 bytestream2_skip(gb, size);
473 t = amf_tag_skip(gb);
474 if (t < 0 || bytestream2_get_bytes_left(gb) <= 0)
478 case AMF_DATA_TYPE_OBJECT_END: return 0;
483 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
488 if (data >= data_end)
491 bytestream2_init(&gb, data, data_end - data);
493 ret = amf_tag_skip(&gb);
494 if (ret < 0 || bytestream2_get_bytes_left(&gb) <= 0)
496 av_assert0(bytestream2_tell(&gb) >= 0 && bytestream2_tell(&gb) <= data_end - data);
497 return bytestream2_tell(&gb);
500 static int amf_get_field_value2(GetByteContext *gb,
501 const uint8_t *name, uint8_t *dst, int dst_size)
503 int namelen = strlen(name);
506 while (bytestream2_peek_byte(gb) != AMF_DATA_TYPE_OBJECT && bytestream2_get_bytes_left(gb) > 0) {
507 int ret = amf_tag_skip(gb);
511 if (bytestream2_get_bytes_left(gb) < 3)
513 bytestream2_get_byte(gb);
516 int size = bytestream2_get_be16(gb);
519 if (size < 0 || size >= bytestream2_get_bytes_left(gb))
521 bytestream2_skip(gb, size);
522 if (size == namelen && !memcmp(gb->buffer-size, name, namelen)) {
523 switch (bytestream2_get_byte(gb)) {
524 case AMF_DATA_TYPE_NUMBER:
525 snprintf(dst, dst_size, "%g", av_int2double(bytestream2_get_be64(gb)));
527 case AMF_DATA_TYPE_BOOL:
528 snprintf(dst, dst_size, "%s", bytestream2_get_byte(gb) ? "true" : "false");
530 case AMF_DATA_TYPE_STRING:
531 len = bytestream2_get_be16(gb);
534 if (dst_size < len + 1)
536 bytestream2_get_buffer(gb, dst, len);
544 len = amf_tag_skip(gb);
545 if (len < 0 || bytestream2_get_bytes_left(gb) <= 0)
551 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
552 const uint8_t *name, uint8_t *dst, int dst_size)
556 if (data >= data_end)
559 bytestream2_init(&gb, data, data_end - data);
561 return amf_get_field_value2(&gb, name, dst, dst_size);
565 static const char* rtmp_packet_type(int type)
568 case RTMP_PT_CHUNK_SIZE: return "chunk size";
569 case RTMP_PT_BYTES_READ: return "bytes read";
570 case RTMP_PT_USER_CONTROL: return "user control";
571 case RTMP_PT_WINDOW_ACK_SIZE: return "window acknowledgement size";
572 case RTMP_PT_SET_PEER_BW: return "set peer bandwidth";
573 case RTMP_PT_AUDIO: return "audio packet";
574 case RTMP_PT_VIDEO: return "video packet";
575 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
576 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
577 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
578 case RTMP_PT_NOTIFY: return "notification";
579 case RTMP_PT_SHARED_OBJ: return "shared object";
580 case RTMP_PT_INVOKE: return "invoke";
581 case RTMP_PT_METADATA: return "metadata";
582 default: return "unknown";
586 static void amf_tag_contents(void *ctx, const uint8_t *data,
587 const uint8_t *data_end)
589 unsigned int size, nb = -1;
594 if (data >= data_end)
596 switch ((type = *data++)) {
597 case AMF_DATA_TYPE_NUMBER:
598 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
600 case AMF_DATA_TYPE_BOOL:
601 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
603 case AMF_DATA_TYPE_STRING:
604 case AMF_DATA_TYPE_LONG_STRING:
605 if (type == AMF_DATA_TYPE_STRING) {
606 size = bytestream_get_be16(&data);
608 size = bytestream_get_be32(&data);
610 size = FFMIN(size, sizeof(buf) - 1);
611 memcpy(buf, data, size);
613 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
615 case AMF_DATA_TYPE_NULL:
616 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
618 case AMF_DATA_TYPE_ARRAY:
620 case AMF_DATA_TYPE_MIXEDARRAY:
621 nb = bytestream_get_be32(&data);
622 case AMF_DATA_TYPE_OBJECT:
623 av_log(ctx, AV_LOG_DEBUG, " {\n");
624 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
627 size = bytestream_get_be16(&data);
628 size = FFMIN(size, sizeof(buf) - 1);
630 av_log(ctx, AV_LOG_DEBUG, " }\n");
634 memcpy(buf, data, size);
636 if (size >= data_end - data)
639 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
641 amf_tag_contents(ctx, data, data_end);
642 t = ff_amf_tag_size(data, data_end);
643 if (t < 0 || t >= data_end - data)
648 case AMF_DATA_TYPE_OBJECT_END:
649 av_log(ctx, AV_LOG_DEBUG, " }\n");
656 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
658 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
659 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->size);
660 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
661 uint8_t *src = p->data, *src_end = p->data + p->size;
662 while (src < src_end) {
664 amf_tag_contents(ctx, src, src_end);
665 sz = ff_amf_tag_size(src, src_end);
670 } else if (p->type == RTMP_PT_WINDOW_ACK_SIZE) {
671 av_log(ctx, AV_LOG_DEBUG, "Window acknowledgement size = %d\n", AV_RB32(p->data));
672 } else if (p->type == RTMP_PT_SET_PEER_BW) {
673 av_log(ctx, AV_LOG_DEBUG, "Set Peer BW = %d\n", AV_RB32(p->data));
674 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
676 for (i = 0; i < p->size; i++)
677 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
678 av_log(ctx, AV_LOG_DEBUG, "\n");
683 int ff_amf_match_string(const uint8_t *data, int size, const char *str)
685 int len = strlen(str);
693 if (type != AMF_DATA_TYPE_LONG_STRING &&
694 type != AMF_DATA_TYPE_STRING)
697 if (type == AMF_DATA_TYPE_LONG_STRING) {
698 if ((size -= 4 + 1) < 0)
700 amf_len = bytestream_get_be32(&data);
702 if ((size -= 2 + 1) < 0)
704 amf_len = bytestream_get_be16(&data);
713 return !memcmp(data, str, len);