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"
29 void ff_amf_write_bool(uint8_t **dst, int val)
31 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
32 bytestream_put_byte(dst, val);
35 void ff_amf_write_number(uint8_t **dst, double val)
37 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
38 bytestream_put_be64(dst, av_dbl2int(val));
41 void ff_amf_write_string(uint8_t **dst, const char *str)
43 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
44 bytestream_put_be16(dst, strlen(str));
45 bytestream_put_buffer(dst, str, strlen(str));
48 void ff_amf_write_null(uint8_t **dst)
50 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
53 void ff_amf_write_object_start(uint8_t **dst)
55 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
58 void ff_amf_write_field_name(uint8_t **dst, const char *str)
60 bytestream_put_be16(dst, strlen(str));
61 bytestream_put_buffer(dst, str, strlen(str));
64 void ff_amf_write_object_end(uint8_t **dst)
66 /* first two bytes are field name length = 0,
67 * AMF object should end with it and end marker
69 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
72 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
73 int chunk_size, RTMPPacket *prev_pkt)
75 uint8_t hdr, t, buf[16];
76 int channel_id, timestamp, data_size, offset = 0;
78 enum RTMPPacketType type;
81 if (url_read(h, &hdr, 1) != 1)
84 channel_id = hdr & 0x3F;
86 if (channel_id < 2) { //special case for channel number >= 64
88 if (url_read_complete(h, buf, channel_id + 1) != channel_id + 1)
90 size += channel_id + 1;
91 channel_id = AV_RL16(buf) + 64;
93 data_size = prev_pkt[channel_id].data_size;
94 type = prev_pkt[channel_id].type;
95 extra = prev_pkt[channel_id].extra;
98 if (hdr == RTMP_PS_ONEBYTE) {
99 timestamp = prev_pkt[channel_id].ts_delta;
101 if (url_read_complete(h, buf, 3) != 3)
104 timestamp = AV_RB24(buf);
105 if (hdr != RTMP_PS_FOURBYTES) {
106 if (url_read_complete(h, buf, 3) != 3)
109 data_size = AV_RB24(buf);
110 if (url_read_complete(h, buf, 1) != 1)
114 if (hdr == RTMP_PS_TWELVEBYTES) {
115 if (url_read_complete(h, buf, 4) != 4)
118 extra = AV_RL32(buf);
121 if (timestamp == 0xFFFFFF) {
122 if (url_read_complete(h, buf, 4) != 4)
124 timestamp = AV_RB32(buf);
127 if (hdr != RTMP_PS_TWELVEBYTES)
128 timestamp += prev_pkt[channel_id].timestamp;
130 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size))
134 prev_pkt[channel_id].channel_id = channel_id;
135 prev_pkt[channel_id].type = type;
136 prev_pkt[channel_id].data_size = data_size;
137 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
138 prev_pkt[channel_id].timestamp = timestamp;
139 prev_pkt[channel_id].extra = extra;
140 while (data_size > 0) {
141 int toread = FFMIN(data_size, chunk_size);
142 if (url_read_complete(h, p->data + offset, toread) != toread) {
143 ff_rtmp_packet_destroy(p);
146 data_size -= chunk_size;
147 offset += chunk_size;
150 url_read_complete(h, &t, 1); //marker
152 if (t != (0xC0 + channel_id))
159 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
160 int chunk_size, RTMPPacket *prev_pkt)
162 uint8_t pkt_hdr[16], *p = pkt_hdr;
163 int mode = RTMP_PS_TWELVEBYTES;
167 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
169 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
170 if (prev_pkt[pkt->channel_id].channel_id &&
171 pkt->extra == prev_pkt[pkt->channel_id].extra) {
172 if (pkt->type == prev_pkt[pkt->channel_id].type &&
173 pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
174 mode = RTMP_PS_FOURBYTES;
175 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
176 mode = RTMP_PS_ONEBYTE;
178 mode = RTMP_PS_EIGHTBYTES;
182 if (pkt->channel_id < 64) {
183 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
184 } else if (pkt->channel_id < 64 + 256) {
185 bytestream_put_byte(&p, 0 | (mode << 6));
186 bytestream_put_byte(&p, pkt->channel_id - 64);
188 bytestream_put_byte(&p, 1 | (mode << 6));
189 bytestream_put_le16(&p, pkt->channel_id - 64);
191 if (mode != RTMP_PS_ONEBYTE) {
192 uint32_t timestamp = pkt->timestamp;
193 if (mode != RTMP_PS_TWELVEBYTES)
194 timestamp = pkt->ts_delta;
195 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
196 if (mode != RTMP_PS_FOURBYTES) {
197 bytestream_put_be24(&p, pkt->data_size);
198 bytestream_put_byte(&p, pkt->type);
199 if (mode == RTMP_PS_TWELVEBYTES)
200 bytestream_put_le32(&p, pkt->extra);
202 if (timestamp >= 0xFFFFFF)
203 bytestream_put_be32(&p, timestamp);
206 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
207 prev_pkt[pkt->channel_id].type = pkt->type;
208 prev_pkt[pkt->channel_id].data_size = pkt->data_size;
209 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
210 if (mode != RTMP_PS_TWELVEBYTES) {
211 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
213 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
215 prev_pkt[pkt->channel_id].extra = pkt->extra;
217 url_write(h, pkt_hdr, p-pkt_hdr);
218 size = p - pkt_hdr + pkt->data_size;
219 while (off < pkt->data_size) {
220 int towrite = FFMIN(chunk_size, pkt->data_size - off);
221 url_write(h, pkt->data + off, towrite);
223 if (off < pkt->data_size) {
224 uint8_t marker = 0xC0 | pkt->channel_id;
225 url_write(h, &marker, 1);
232 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
233 int timestamp, int size)
235 pkt->data = av_malloc(size);
237 return AVERROR(ENOMEM);
238 pkt->data_size = size;
239 pkt->channel_id = channel_id;
241 pkt->timestamp = timestamp;
248 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
252 av_freep(&pkt->data);
256 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
258 const uint8_t *base = data;
260 if (data >= data_end)
263 case AMF_DATA_TYPE_NUMBER: return 9;
264 case AMF_DATA_TYPE_BOOL: return 2;
265 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
266 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
267 case AMF_DATA_TYPE_NULL: return 1;
268 case AMF_DATA_TYPE_ARRAY:
270 case AMF_DATA_TYPE_OBJECT:
272 int size = bytestream_get_be16(&data);
278 if (data + size >= data_end || data + size < data)
281 t = ff_amf_tag_size(data, data_end);
282 if (t < 0 || data + t >= data_end)
287 case AMF_DATA_TYPE_OBJECT_END: return 1;
292 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
293 const uint8_t *name, uint8_t *dst, int dst_size)
295 int namelen = strlen(name);
298 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
299 len = ff_amf_tag_size(data, data_end);
301 len = data_end - data;
304 if (data_end - data < 3)
308 int size = bytestream_get_be16(&data);
311 if (data + size >= data_end || data + size < data)
314 if (size == namelen && !memcmp(data-size, name, namelen)) {
316 case AMF_DATA_TYPE_NUMBER:
317 snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data)));
319 case AMF_DATA_TYPE_BOOL:
320 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
322 case AMF_DATA_TYPE_STRING:
323 len = bytestream_get_be16(&data);
324 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
331 len = ff_amf_tag_size(data, data_end);
332 if (len < 0 || data + len >= data_end || data + len < data)
339 static const char* rtmp_packet_type(int type)
342 case RTMP_PT_CHUNK_SIZE: return "chunk size";
343 case RTMP_PT_BYTES_READ: return "bytes read";
344 case RTMP_PT_PING: return "ping";
345 case RTMP_PT_SERVER_BW: return "server bandwidth";
346 case RTMP_PT_CLIENT_BW: return "client bandwidth";
347 case RTMP_PT_AUDIO: return "audio packet";
348 case RTMP_PT_VIDEO: return "video packet";
349 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
350 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
351 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
352 case RTMP_PT_NOTIFY: return "notification";
353 case RTMP_PT_SHARED_OBJ: return "shared object";
354 case RTMP_PT_INVOKE: return "invoke";
355 case RTMP_PT_METADATA: return "metadata";
356 default: return "unknown";
360 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end)
365 if (data >= data_end)
368 case AMF_DATA_TYPE_NUMBER:
369 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2dbl(AV_RB64(data)));
371 case AMF_DATA_TYPE_BOOL:
372 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
374 case AMF_DATA_TYPE_STRING:
375 case AMF_DATA_TYPE_LONG_STRING:
376 if (data[-1] == AMF_DATA_TYPE_STRING) {
377 size = bytestream_get_be16(&data);
379 size = bytestream_get_be32(&data);
381 size = FFMIN(size, 1023);
382 memcpy(buf, data, size);
384 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
386 case AMF_DATA_TYPE_NULL:
387 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
389 case AMF_DATA_TYPE_ARRAY:
391 case AMF_DATA_TYPE_OBJECT:
392 av_log(ctx, AV_LOG_DEBUG, " {\n");
394 int size = bytestream_get_be16(&data);
396 memcpy(buf, data, size);
399 av_log(ctx, AV_LOG_DEBUG, " }\n");
403 if (data + size >= data_end || data + size < data)
406 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
407 ff_amf_tag_contents(ctx, data, data_end);
408 t = ff_amf_tag_size(data, data_end);
409 if (t < 0 || data + t >= data_end)
414 case AMF_DATA_TYPE_OBJECT_END:
415 av_log(ctx, AV_LOG_DEBUG, " }\n");
422 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
424 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
425 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size);
426 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
427 uint8_t *src = p->data, *src_end = p->data + p->data_size;
428 while (src < src_end) {
430 ff_amf_tag_contents(ctx, src, src_end);
431 sz = ff_amf_tag_size(src, src_end);
436 } else if (p->type == RTMP_PT_SERVER_BW){
437 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
438 } else if (p->type == RTMP_PT_CLIENT_BW){
439 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
440 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
442 for (i = 0; i < p->data_size; i++)
443 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
444 av_log(ctx, AV_LOG_DEBUG, "\n");