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_rtmp_packet_read(URLContext *h, RTMPPacket *p,
75 int chunk_size, RTMPPacket *prev_pkt)
77 uint8_t hdr, t, buf[16];
78 int channel_id, timestamp, data_size, offset = 0;
80 enum RTMPPacketType type;
84 if (ffurl_read(h, &hdr, 1) != 1)
87 channel_id = hdr & 0x3F;
89 if (channel_id < 2) { //special case for channel number >= 64
91 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
93 size += channel_id + 1;
94 channel_id = AV_RL16(buf) + 64;
96 data_size = prev_pkt[channel_id].data_size;
97 type = prev_pkt[channel_id].type;
98 extra = prev_pkt[channel_id].extra;
101 if (hdr == RTMP_PS_ONEBYTE) {
102 timestamp = prev_pkt[channel_id].ts_delta;
104 if (ffurl_read_complete(h, buf, 3) != 3)
107 timestamp = AV_RB24(buf);
108 if (hdr != RTMP_PS_FOURBYTES) {
109 if (ffurl_read_complete(h, buf, 3) != 3)
112 data_size = AV_RB24(buf);
113 if (ffurl_read_complete(h, buf, 1) != 1)
117 if (hdr == RTMP_PS_TWELVEBYTES) {
118 if (ffurl_read_complete(h, buf, 4) != 4)
121 extra = AV_RL32(buf);
124 if (timestamp == 0xFFFFFF) {
125 if (ffurl_read_complete(h, buf, 4) != 4)
127 timestamp = AV_RB32(buf);
130 if (hdr != RTMP_PS_TWELVEBYTES)
131 timestamp += prev_pkt[channel_id].timestamp;
133 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
138 prev_pkt[channel_id].channel_id = channel_id;
139 prev_pkt[channel_id].type = type;
140 prev_pkt[channel_id].data_size = data_size;
141 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
142 prev_pkt[channel_id].timestamp = timestamp;
143 prev_pkt[channel_id].extra = extra;
144 while (data_size > 0) {
145 int toread = FFMIN(data_size, chunk_size);
146 if (ffurl_read_complete(h, p->data + offset, toread) != toread) {
147 ff_rtmp_packet_destroy(p);
150 data_size -= chunk_size;
151 offset += chunk_size;
154 if ((ret = ffurl_read_complete(h, &t, 1)) < 0) { // marker
155 ff_rtmp_packet_destroy(p);
159 if (t != (0xC0 + channel_id))
166 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
167 int chunk_size, RTMPPacket *prev_pkt)
169 uint8_t pkt_hdr[16], *p = pkt_hdr;
170 int mode = RTMP_PS_TWELVEBYTES;
175 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
177 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
178 if (prev_pkt[pkt->channel_id].channel_id &&
179 pkt->extra == prev_pkt[pkt->channel_id].extra) {
180 if (pkt->type == prev_pkt[pkt->channel_id].type &&
181 pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
182 mode = RTMP_PS_FOURBYTES;
183 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
184 mode = RTMP_PS_ONEBYTE;
186 mode = RTMP_PS_EIGHTBYTES;
190 if (pkt->channel_id < 64) {
191 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
192 } else if (pkt->channel_id < 64 + 256) {
193 bytestream_put_byte(&p, 0 | (mode << 6));
194 bytestream_put_byte(&p, pkt->channel_id - 64);
196 bytestream_put_byte(&p, 1 | (mode << 6));
197 bytestream_put_le16(&p, pkt->channel_id - 64);
199 if (mode != RTMP_PS_ONEBYTE) {
200 uint32_t timestamp = pkt->timestamp;
201 if (mode != RTMP_PS_TWELVEBYTES)
202 timestamp = pkt->ts_delta;
203 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
204 if (mode != RTMP_PS_FOURBYTES) {
205 bytestream_put_be24(&p, pkt->data_size);
206 bytestream_put_byte(&p, pkt->type);
207 if (mode == RTMP_PS_TWELVEBYTES)
208 bytestream_put_le32(&p, pkt->extra);
210 if (timestamp >= 0xFFFFFF)
211 bytestream_put_be32(&p, timestamp);
214 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
215 prev_pkt[pkt->channel_id].type = pkt->type;
216 prev_pkt[pkt->channel_id].data_size = pkt->data_size;
217 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
218 if (mode != RTMP_PS_TWELVEBYTES) {
219 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
221 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
223 prev_pkt[pkt->channel_id].extra = pkt->extra;
225 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
227 size = p - pkt_hdr + pkt->data_size;
228 while (off < pkt->data_size) {
229 int towrite = FFMIN(chunk_size, pkt->data_size - off);
230 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
233 if (off < pkt->data_size) {
234 uint8_t marker = 0xC0 | pkt->channel_id;
235 if ((ret = ffurl_write(h, &marker, 1)) < 0)
243 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
244 int timestamp, int size)
247 pkt->data = av_malloc(size);
249 return AVERROR(ENOMEM);
251 pkt->data_size = size;
252 pkt->channel_id = channel_id;
254 pkt->timestamp = timestamp;
261 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
265 av_freep(&pkt->data);
269 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
271 const uint8_t *base = data;
273 if (data >= data_end)
276 case AMF_DATA_TYPE_NUMBER: return 9;
277 case AMF_DATA_TYPE_BOOL: return 2;
278 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
279 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
280 case AMF_DATA_TYPE_NULL: return 1;
281 case AMF_DATA_TYPE_ARRAY:
283 case AMF_DATA_TYPE_OBJECT:
285 int size = bytestream_get_be16(&data);
291 if (data + size >= data_end || data + size < data)
294 t = ff_amf_tag_size(data, data_end);
295 if (t < 0 || data + t >= data_end)
300 case AMF_DATA_TYPE_OBJECT_END: return 1;
305 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
306 const uint8_t *name, uint8_t *dst, int dst_size)
308 int namelen = strlen(name);
311 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
312 len = ff_amf_tag_size(data, data_end);
314 len = data_end - data;
317 if (data_end - data < 3)
321 int size = bytestream_get_be16(&data);
324 if (data + size >= data_end || data + size < data)
327 if (size == namelen && !memcmp(data-size, name, namelen)) {
329 case AMF_DATA_TYPE_NUMBER:
330 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
332 case AMF_DATA_TYPE_BOOL:
333 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
335 case AMF_DATA_TYPE_STRING:
336 len = bytestream_get_be16(&data);
337 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
344 len = ff_amf_tag_size(data, data_end);
345 if (len < 0 || data + len >= data_end || data + len < data)
352 static const char* rtmp_packet_type(int type)
355 case RTMP_PT_CHUNK_SIZE: return "chunk size";
356 case RTMP_PT_BYTES_READ: return "bytes read";
357 case RTMP_PT_PING: return "ping";
358 case RTMP_PT_SERVER_BW: return "server bandwidth";
359 case RTMP_PT_CLIENT_BW: return "client bandwidth";
360 case RTMP_PT_AUDIO: return "audio packet";
361 case RTMP_PT_VIDEO: return "video packet";
362 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
363 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
364 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
365 case RTMP_PT_NOTIFY: return "notification";
366 case RTMP_PT_SHARED_OBJ: return "shared object";
367 case RTMP_PT_INVOKE: return "invoke";
368 case RTMP_PT_METADATA: return "metadata";
369 default: return "unknown";
373 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end)
378 if (data >= data_end)
381 case AMF_DATA_TYPE_NUMBER:
382 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
384 case AMF_DATA_TYPE_BOOL:
385 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
387 case AMF_DATA_TYPE_STRING:
388 case AMF_DATA_TYPE_LONG_STRING:
389 if (data[-1] == AMF_DATA_TYPE_STRING) {
390 size = bytestream_get_be16(&data);
392 size = bytestream_get_be32(&data);
394 size = FFMIN(size, 1023);
395 memcpy(buf, data, size);
397 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
399 case AMF_DATA_TYPE_NULL:
400 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
402 case AMF_DATA_TYPE_ARRAY:
404 case AMF_DATA_TYPE_OBJECT:
405 av_log(ctx, AV_LOG_DEBUG, " {\n");
407 int size = bytestream_get_be16(&data);
409 memcpy(buf, data, size);
412 av_log(ctx, AV_LOG_DEBUG, " }\n");
416 if (data + size >= data_end || data + size < data)
419 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
420 ff_amf_tag_contents(ctx, data, data_end);
421 t = ff_amf_tag_size(data, data_end);
422 if (t < 0 || data + t >= data_end)
427 case AMF_DATA_TYPE_OBJECT_END:
428 av_log(ctx, AV_LOG_DEBUG, " }\n");
435 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
437 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
438 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size);
439 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
440 uint8_t *src = p->data, *src_end = p->data + p->data_size;
441 while (src < src_end) {
443 ff_amf_tag_contents(ctx, src, src_end);
444 sz = ff_amf_tag_size(src, src_end);
449 } else if (p->type == RTMP_PT_SERVER_BW){
450 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
451 } else if (p->type == RTMP_PT_CLIENT_BW){
452 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
453 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
455 for (i = 0; i < p->data_size; i++)
456 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
457 av_log(ctx, AV_LOG_DEBUG, "\n");