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_packet_read(URLContext *h, RTMPPacket *p,
133 int chunk_size, RTMPPacket *prev_pkt)
137 if (ffurl_read(h, &hdr, 1) != 1)
140 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt, hdr);
143 static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,
144 int chunk_size, RTMPPacket *prev_pkt,
149 int channel_id, timestamp, size;
151 enum RTMPPacketType type;
156 channel_id = hdr & 0x3F;
158 if (channel_id < 2) { //special case for channel number >= 64
160 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
162 written += channel_id + 1;
163 channel_id = AV_RL16(buf) + 64;
165 size = prev_pkt[channel_id].size;
166 type = prev_pkt[channel_id].type;
167 extra = prev_pkt[channel_id].extra;
170 if (hdr == RTMP_PS_ONEBYTE) {
171 timestamp = prev_pkt[channel_id].ts_delta;
173 if (ffurl_read_complete(h, buf, 3) != 3)
176 timestamp = AV_RB24(buf);
177 if (hdr != RTMP_PS_FOURBYTES) {
178 if (ffurl_read_complete(h, buf, 3) != 3)
182 if (ffurl_read_complete(h, buf, 1) != 1)
186 if (hdr == RTMP_PS_TWELVEBYTES) {
187 if (ffurl_read_complete(h, buf, 4) != 4)
190 extra = AV_RL32(buf);
193 if (timestamp == 0xFFFFFF) {
194 if (ffurl_read_complete(h, buf, 4) != 4)
196 timestamp = AV_RB32(buf);
199 if (hdr != RTMP_PS_TWELVEBYTES)
200 timestamp += prev_pkt[channel_id].timestamp;
202 if (!prev_pkt[channel_id].read) {
203 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
208 prev_pkt[channel_id].ts_delta = timestamp -
209 prev_pkt[channel_id].timestamp;
210 prev_pkt[channel_id].timestamp = timestamp;
212 // previous packet in this channel hasn't completed reading
213 RTMPPacket *prev = &prev_pkt[channel_id];
214 p->data = prev->data;
215 p->size = prev->size;
216 p->channel_id = prev->channel_id;
217 p->type = prev->type;
218 p->ts_delta = prev->ts_delta;
219 p->extra = prev->extra;
220 p->offset = prev->offset;
221 p->read = prev->read + written;
222 p->timestamp = prev->timestamp;
227 prev_pkt[channel_id].channel_id = channel_id;
228 prev_pkt[channel_id].type = type;
229 prev_pkt[channel_id].size = size;
230 prev_pkt[channel_id].extra = extra;
231 size = size - p->offset;
233 toread = FFMIN(size, chunk_size);
234 if (ffurl_read_complete(h, p->data + p->offset, toread) != toread) {
235 ff_rtmp_packet_destroy(p);
243 RTMPPacket *prev = &prev_pkt[channel_id];
244 prev->data = p->data;
245 prev->read = p->read;
246 prev->offset = p->offset;
247 return AVERROR(EAGAIN);
250 prev_pkt[channel_id].read = 0; // read complete; reset if needed
254 int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
255 RTMPPacket *prev_pkt, uint8_t hdr)
258 int ret = rtmp_packet_read_one_chunk(h, p, chunk_size, prev_pkt, hdr);
259 if (ret > 0 || ret != AVERROR(EAGAIN))
262 if (ffurl_read(h, &hdr, 1) != 1)
267 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
268 int chunk_size, RTMPPacket *prev_pkt)
270 uint8_t pkt_hdr[16], *p = pkt_hdr;
271 int mode = RTMP_PS_TWELVEBYTES;
276 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
278 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
279 if (prev_pkt[pkt->channel_id].channel_id &&
280 pkt->extra == prev_pkt[pkt->channel_id].extra) {
281 if (pkt->type == prev_pkt[pkt->channel_id].type &&
282 pkt->size == prev_pkt[pkt->channel_id].size) {
283 mode = RTMP_PS_FOURBYTES;
284 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
285 mode = RTMP_PS_ONEBYTE;
287 mode = RTMP_PS_EIGHTBYTES;
291 if (pkt->channel_id < 64) {
292 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
293 } else if (pkt->channel_id < 64 + 256) {
294 bytestream_put_byte(&p, 0 | (mode << 6));
295 bytestream_put_byte(&p, pkt->channel_id - 64);
297 bytestream_put_byte(&p, 1 | (mode << 6));
298 bytestream_put_le16(&p, pkt->channel_id - 64);
300 if (mode != RTMP_PS_ONEBYTE) {
301 uint32_t timestamp = pkt->timestamp;
302 if (mode != RTMP_PS_TWELVEBYTES)
303 timestamp = pkt->ts_delta;
304 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
305 if (mode != RTMP_PS_FOURBYTES) {
306 bytestream_put_be24(&p, pkt->size);
307 bytestream_put_byte(&p, pkt->type);
308 if (mode == RTMP_PS_TWELVEBYTES)
309 bytestream_put_le32(&p, pkt->extra);
311 if (timestamp >= 0xFFFFFF)
312 bytestream_put_be32(&p, timestamp);
315 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
316 prev_pkt[pkt->channel_id].type = pkt->type;
317 prev_pkt[pkt->channel_id].size = pkt->size;
318 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
319 if (mode != RTMP_PS_TWELVEBYTES) {
320 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
322 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
324 prev_pkt[pkt->channel_id].extra = pkt->extra;
326 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
328 written = p - pkt_hdr + pkt->size;
329 while (off < pkt->size) {
330 int towrite = FFMIN(chunk_size, pkt->size - off);
331 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
334 if (off < pkt->size) {
335 uint8_t marker = 0xC0 | pkt->channel_id;
336 if ((ret = ffurl_write(h, &marker, 1)) < 0)
344 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
345 int timestamp, int size)
348 pkt->data = av_malloc(size);
350 return AVERROR(ENOMEM);
353 pkt->channel_id = channel_id;
355 pkt->timestamp = timestamp;
362 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
366 av_freep(&pkt->data);
370 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
372 const uint8_t *base = data;
377 if (data >= data_end)
379 switch ((type = *data++)) {
380 case AMF_DATA_TYPE_NUMBER: return 9;
381 case AMF_DATA_TYPE_BOOL: return 2;
382 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
383 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
384 case AMF_DATA_TYPE_NULL: return 1;
385 case AMF_DATA_TYPE_ARRAY:
387 case AMF_DATA_TYPE_MIXEDARRAY:
388 nb = bytestream_get_be32(&data);
389 case AMF_DATA_TYPE_OBJECT:
390 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
393 int size = bytestream_get_be16(&data);
398 if (size < 0 || size >= data_end - data)
402 t = ff_amf_tag_size(data, data_end);
403 if (t < 0 || t >= data_end - data)
408 case AMF_DATA_TYPE_OBJECT_END: return 1;
413 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
414 const uint8_t *name, uint8_t *dst, int dst_size)
416 int namelen = strlen(name);
419 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
420 len = ff_amf_tag_size(data, data_end);
422 len = data_end - data;
425 if (data_end - data < 3)
429 int size = bytestream_get_be16(&data);
432 if (size < 0 || size >= data_end - data)
435 if (size == namelen && !memcmp(data-size, name, namelen)) {
437 case AMF_DATA_TYPE_NUMBER:
438 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
440 case AMF_DATA_TYPE_BOOL:
441 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
443 case AMF_DATA_TYPE_STRING:
444 len = bytestream_get_be16(&data);
445 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
452 len = ff_amf_tag_size(data, data_end);
453 if (len < 0 || len >= data_end - data)
460 static const char* rtmp_packet_type(int type)
463 case RTMP_PT_CHUNK_SIZE: return "chunk size";
464 case RTMP_PT_BYTES_READ: return "bytes read";
465 case RTMP_PT_PING: return "ping";
466 case RTMP_PT_SERVER_BW: return "server bandwidth";
467 case RTMP_PT_CLIENT_BW: return "client bandwidth";
468 case RTMP_PT_AUDIO: return "audio packet";
469 case RTMP_PT_VIDEO: return "video packet";
470 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
471 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
472 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
473 case RTMP_PT_NOTIFY: return "notification";
474 case RTMP_PT_SHARED_OBJ: return "shared object";
475 case RTMP_PT_INVOKE: return "invoke";
476 case RTMP_PT_METADATA: return "metadata";
477 default: return "unknown";
481 static void amf_tag_contents(void *ctx, const uint8_t *data,
482 const uint8_t *data_end)
484 unsigned int size, nb = -1;
489 if (data >= data_end)
491 switch ((type = *data++)) {
492 case AMF_DATA_TYPE_NUMBER:
493 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
495 case AMF_DATA_TYPE_BOOL:
496 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
498 case AMF_DATA_TYPE_STRING:
499 case AMF_DATA_TYPE_LONG_STRING:
500 if (type == AMF_DATA_TYPE_STRING) {
501 size = bytestream_get_be16(&data);
503 size = bytestream_get_be32(&data);
505 size = FFMIN(size, sizeof(buf) - 1);
506 memcpy(buf, data, size);
508 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
510 case AMF_DATA_TYPE_NULL:
511 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
513 case AMF_DATA_TYPE_ARRAY:
515 case AMF_DATA_TYPE_MIXEDARRAY:
516 nb = bytestream_get_be32(&data);
517 case AMF_DATA_TYPE_OBJECT:
518 av_log(ctx, AV_LOG_DEBUG, " {\n");
519 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
522 size = bytestream_get_be16(&data);
523 size = FFMIN(size, sizeof(buf) - 1);
525 av_log(ctx, AV_LOG_DEBUG, " }\n");
529 memcpy(buf, data, size);
531 if (size >= data_end - data)
534 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
536 amf_tag_contents(ctx, data, data_end);
537 t = ff_amf_tag_size(data, data_end);
538 if (t < 0 || t >= data_end - data)
543 case AMF_DATA_TYPE_OBJECT_END:
544 av_log(ctx, AV_LOG_DEBUG, " }\n");
551 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
553 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
554 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->size);
555 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
556 uint8_t *src = p->data, *src_end = p->data + p->size;
557 while (src < src_end) {
559 amf_tag_contents(ctx, src, src_end);
560 sz = ff_amf_tag_size(src, src_end);
565 } else if (p->type == RTMP_PT_SERVER_BW){
566 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
567 } else if (p->type == RTMP_PT_CLIENT_BW){
568 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
569 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
571 for (i = 0; i < p->size; i++)
572 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
573 av_log(ctx, AV_LOG_DEBUG, "\n");
577 int ff_amf_match_string(const uint8_t *data, int size, const char *str)
579 int len = strlen(str);
587 if (type != AMF_DATA_TYPE_LONG_STRING &&
588 type != AMF_DATA_TYPE_STRING)
591 if (type == AMF_DATA_TYPE_LONG_STRING) {
592 if ((size -= 4 + 1) < 0)
594 amf_len = bytestream_get_be32(&data);
596 if ((size -= 2 + 1) < 0)
598 amf_len = bytestream_get_be16(&data);
607 return !memcmp(data, str, len);