3 * Copyright (c) 2009 Kostya 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_null(uint8_t **dst)
52 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
55 void ff_amf_write_object_start(uint8_t **dst)
57 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
60 void ff_amf_write_field_name(uint8_t **dst, const char *str)
62 bytestream_put_be16(dst, strlen(str));
63 bytestream_put_buffer(dst, str, strlen(str));
66 void ff_amf_write_object_end(uint8_t **dst)
68 /* first two bytes are field name length = 0,
69 * AMF object should end with it and end marker
71 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
74 int ff_amf_read_bool(GetByteContext *bc, int *val)
76 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_BOOL)
77 return AVERROR_INVALIDDATA;
78 *val = bytestream2_get_byte(bc);
82 int ff_amf_read_number(GetByteContext *bc, double *val)
85 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NUMBER)
86 return AVERROR_INVALIDDATA;
87 read = bytestream2_get_be64(bc);
88 *val = av_int2double(read);
92 int ff_amf_read_string(GetByteContext *bc, uint8_t *str,
93 int strsize, int *length)
97 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)
98 return AVERROR_INVALIDDATA;
99 stringlen = bytestream2_get_be16(bc);
100 if (stringlen + 1 > strsize)
101 return AVERROR(EINVAL);
102 readsize = bytestream2_get_buffer(bc, str, stringlen);
103 if (readsize != stringlen) {
104 av_log(NULL, AV_LOG_WARNING,
105 "Unable to read as many bytes as AMF string signaled\n");
107 str[readsize] = '\0';
108 *length = FFMIN(stringlen, readsize);
112 int ff_amf_read_null(GetByteContext *bc)
114 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)
115 return AVERROR_INVALIDDATA;
119 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
120 int chunk_size, RTMPPacket *prev_pkt)
124 if (ffurl_read(h, &hdr, 1) != 1)
127 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt, hdr);
130 int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
131 RTMPPacket *prev_pkt, uint8_t hdr)
135 int channel_id, timestamp, data_size, offset = 0;
137 enum RTMPPacketType type;
142 channel_id = hdr & 0x3F;
144 if (channel_id < 2) { //special case for channel number >= 64
146 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
148 size += channel_id + 1;
149 channel_id = AV_RL16(buf) + 64;
151 data_size = prev_pkt[channel_id].data_size;
152 type = prev_pkt[channel_id].type;
153 extra = prev_pkt[channel_id].extra;
156 if (hdr == RTMP_PS_ONEBYTE) {
157 timestamp = prev_pkt[channel_id].ts_delta;
159 if (ffurl_read_complete(h, buf, 3) != 3)
162 timestamp = AV_RB24(buf);
163 if (hdr != RTMP_PS_FOURBYTES) {
164 if (ffurl_read_complete(h, buf, 3) != 3)
167 data_size = AV_RB24(buf);
168 if (ffurl_read_complete(h, buf, 1) != 1)
172 if (hdr == RTMP_PS_TWELVEBYTES) {
173 if (ffurl_read_complete(h, buf, 4) != 4)
176 extra = AV_RL32(buf);
179 if (timestamp == 0xFFFFFF) {
180 if (ffurl_read_complete(h, buf, 4) != 4)
182 timestamp = AV_RB32(buf);
185 if (hdr != RTMP_PS_TWELVEBYTES)
186 timestamp += prev_pkt[channel_id].timestamp;
188 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
193 prev_pkt[channel_id].channel_id = channel_id;
194 prev_pkt[channel_id].type = type;
195 prev_pkt[channel_id].data_size = data_size;
196 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
197 prev_pkt[channel_id].timestamp = timestamp;
198 prev_pkt[channel_id].extra = extra;
199 while (data_size > 0) {
200 int toread = FFMIN(data_size, chunk_size);
201 if (ffurl_read_complete(h, p->data + offset, toread) != toread) {
202 ff_rtmp_packet_destroy(p);
205 data_size -= chunk_size;
206 offset += chunk_size;
209 if ((ret = ffurl_read_complete(h, &t, 1)) < 0) { // marker
210 ff_rtmp_packet_destroy(p);
214 if (t != (0xC0 + channel_id))
221 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
222 int chunk_size, RTMPPacket *prev_pkt)
224 uint8_t pkt_hdr[16], *p = pkt_hdr;
225 int mode = RTMP_PS_TWELVEBYTES;
230 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
232 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
233 if (prev_pkt[pkt->channel_id].channel_id &&
234 pkt->extra == prev_pkt[pkt->channel_id].extra) {
235 if (pkt->type == prev_pkt[pkt->channel_id].type &&
236 pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
237 mode = RTMP_PS_FOURBYTES;
238 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
239 mode = RTMP_PS_ONEBYTE;
241 mode = RTMP_PS_EIGHTBYTES;
245 if (pkt->channel_id < 64) {
246 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
247 } else if (pkt->channel_id < 64 + 256) {
248 bytestream_put_byte(&p, 0 | (mode << 6));
249 bytestream_put_byte(&p, pkt->channel_id - 64);
251 bytestream_put_byte(&p, 1 | (mode << 6));
252 bytestream_put_le16(&p, pkt->channel_id - 64);
254 if (mode != RTMP_PS_ONEBYTE) {
255 uint32_t timestamp = pkt->timestamp;
256 if (mode != RTMP_PS_TWELVEBYTES)
257 timestamp = pkt->ts_delta;
258 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
259 if (mode != RTMP_PS_FOURBYTES) {
260 bytestream_put_be24(&p, pkt->data_size);
261 bytestream_put_byte(&p, pkt->type);
262 if (mode == RTMP_PS_TWELVEBYTES)
263 bytestream_put_le32(&p, pkt->extra);
265 if (timestamp >= 0xFFFFFF)
266 bytestream_put_be32(&p, timestamp);
269 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
270 prev_pkt[pkt->channel_id].type = pkt->type;
271 prev_pkt[pkt->channel_id].data_size = pkt->data_size;
272 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
273 if (mode != RTMP_PS_TWELVEBYTES) {
274 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
276 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
278 prev_pkt[pkt->channel_id].extra = pkt->extra;
280 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
282 size = p - pkt_hdr + pkt->data_size;
283 while (off < pkt->data_size) {
284 int towrite = FFMIN(chunk_size, pkt->data_size - off);
285 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
288 if (off < pkt->data_size) {
289 uint8_t marker = 0xC0 | pkt->channel_id;
290 if ((ret = ffurl_write(h, &marker, 1)) < 0)
298 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
299 int timestamp, int size)
302 pkt->data = av_malloc(size);
304 return AVERROR(ENOMEM);
306 pkt->data_size = size;
307 pkt->channel_id = channel_id;
309 pkt->timestamp = timestamp;
316 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
320 av_freep(&pkt->data);
324 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
326 const uint8_t *base = data;
328 if (data >= data_end)
331 case AMF_DATA_TYPE_NUMBER: return 9;
332 case AMF_DATA_TYPE_BOOL: return 2;
333 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
334 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
335 case AMF_DATA_TYPE_NULL: return 1;
336 case AMF_DATA_TYPE_ARRAY:
338 case AMF_DATA_TYPE_OBJECT:
340 int size = bytestream_get_be16(&data);
346 if (data + size >= data_end || data + size < data)
349 t = ff_amf_tag_size(data, data_end);
350 if (t < 0 || data + t >= data_end)
355 case AMF_DATA_TYPE_OBJECT_END: return 1;
360 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
361 const uint8_t *name, uint8_t *dst, int dst_size)
363 int namelen = strlen(name);
366 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
367 len = ff_amf_tag_size(data, data_end);
369 len = data_end - data;
372 if (data_end - data < 3)
376 int size = bytestream_get_be16(&data);
379 if (data + size >= data_end || data + size < data)
382 if (size == namelen && !memcmp(data-size, name, namelen)) {
384 case AMF_DATA_TYPE_NUMBER:
385 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
387 case AMF_DATA_TYPE_BOOL:
388 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
390 case AMF_DATA_TYPE_STRING:
391 len = bytestream_get_be16(&data);
392 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
399 len = ff_amf_tag_size(data, data_end);
400 if (len < 0 || data + len >= data_end || data + len < data)
407 static const char* rtmp_packet_type(int type)
410 case RTMP_PT_CHUNK_SIZE: return "chunk size";
411 case RTMP_PT_BYTES_READ: return "bytes read";
412 case RTMP_PT_PING: return "ping";
413 case RTMP_PT_SERVER_BW: return "server bandwidth";
414 case RTMP_PT_CLIENT_BW: return "client bandwidth";
415 case RTMP_PT_AUDIO: return "audio packet";
416 case RTMP_PT_VIDEO: return "video packet";
417 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
418 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
419 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
420 case RTMP_PT_NOTIFY: return "notification";
421 case RTMP_PT_SHARED_OBJ: return "shared object";
422 case RTMP_PT_INVOKE: return "invoke";
423 case RTMP_PT_METADATA: return "metadata";
424 default: return "unknown";
428 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end)
433 if (data >= data_end)
436 case AMF_DATA_TYPE_NUMBER:
437 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
439 case AMF_DATA_TYPE_BOOL:
440 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
442 case AMF_DATA_TYPE_STRING:
443 case AMF_DATA_TYPE_LONG_STRING:
444 if (data[-1] == AMF_DATA_TYPE_STRING) {
445 size = bytestream_get_be16(&data);
447 size = bytestream_get_be32(&data);
449 size = FFMIN(size, 1023);
450 memcpy(buf, data, size);
452 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
454 case AMF_DATA_TYPE_NULL:
455 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
457 case AMF_DATA_TYPE_ARRAY:
459 case AMF_DATA_TYPE_OBJECT:
460 av_log(ctx, AV_LOG_DEBUG, " {\n");
462 int size = bytestream_get_be16(&data);
464 memcpy(buf, data, size);
467 av_log(ctx, AV_LOG_DEBUG, " }\n");
471 if (data + size >= data_end || data + size < data)
474 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
475 ff_amf_tag_contents(ctx, data, data_end);
476 t = ff_amf_tag_size(data, data_end);
477 if (t < 0 || data + t >= data_end)
482 case AMF_DATA_TYPE_OBJECT_END:
483 av_log(ctx, AV_LOG_DEBUG, " }\n");
490 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
492 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
493 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size);
494 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
495 uint8_t *src = p->data, *src_end = p->data + p->data_size;
496 while (src < src_end) {
498 ff_amf_tag_contents(ctx, src, src_end);
499 sz = ff_amf_tag_size(src, src_end);
504 } else if (p->type == RTMP_PT_SERVER_BW){
505 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
506 } else if (p->type == RTMP_PT_CLIENT_BW){
507 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
508 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
510 for (i = 0; i < p->data_size; i++)
511 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
512 av_log(ctx, AV_LOG_DEBUG, "\n");