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;
80 if (url_read(h, &hdr, 1) != 1)
82 channel_id = hdr & 0x3F;
84 if (channel_id < 2) { //special case for channel number >= 64
86 if (url_read_complete(h, buf, channel_id + 1) != channel_id + 1)
88 channel_id = AV_RL16(buf) + 64;
90 data_size = prev_pkt[channel_id].data_size;
91 type = prev_pkt[channel_id].type;
92 extra = prev_pkt[channel_id].extra;
95 if (hdr == RTMP_PS_ONEBYTE) {
96 timestamp = prev_pkt[channel_id].ts_delta;
98 if (url_read_complete(h, buf, 3) != 3)
100 timestamp = AV_RB24(buf);
101 if (hdr != RTMP_PS_FOURBYTES) {
102 if (url_read_complete(h, buf, 3) != 3)
104 data_size = AV_RB24(buf);
105 if (url_read_complete(h, buf, 1) != 1)
108 if (hdr == RTMP_PS_TWELVEBYTES) {
109 if (url_read_complete(h, buf, 4) != 4)
111 extra = AV_RL32(buf);
114 if (timestamp == 0xFFFFFF) {
115 if (url_read_complete(h, buf, 4) != 4)
117 timestamp = AV_RB32(buf);
120 if (hdr != RTMP_PS_TWELVEBYTES)
121 timestamp += prev_pkt[channel_id].timestamp;
123 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size))
127 prev_pkt[channel_id].channel_id = channel_id;
128 prev_pkt[channel_id].type = type;
129 prev_pkt[channel_id].data_size = data_size;
130 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
131 prev_pkt[channel_id].timestamp = timestamp;
132 prev_pkt[channel_id].extra = extra;
133 while (data_size > 0) {
134 int toread = FFMIN(data_size, chunk_size);
135 if (url_read_complete(h, p->data + offset, toread) != toread) {
136 ff_rtmp_packet_destroy(p);
139 data_size -= chunk_size;
140 offset += chunk_size;
142 url_read_complete(h, &t, 1); //marker
143 if (t != (0xC0 + channel_id))
150 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
151 int chunk_size, RTMPPacket *prev_pkt)
153 uint8_t pkt_hdr[16], *p = pkt_hdr;
154 int mode = RTMP_PS_TWELVEBYTES;
156 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
158 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
159 if (prev_pkt[pkt->channel_id].channel_id &&
160 pkt->extra == prev_pkt[pkt->channel_id].extra) {
161 if (pkt->type == prev_pkt[pkt->channel_id].type &&
162 pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
163 mode = RTMP_PS_FOURBYTES;
164 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
165 mode = RTMP_PS_ONEBYTE;
167 mode = RTMP_PS_EIGHTBYTES;
171 if (pkt->channel_id < 64) {
172 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
173 } else if (pkt->channel_id < 64 + 256) {
174 bytestream_put_byte(&p, 0 | (mode << 6));
175 bytestream_put_byte(&p, pkt->channel_id - 64);
177 bytestream_put_byte(&p, 1 | (mode << 6));
178 bytestream_put_le16(&p, pkt->channel_id - 64);
180 if (mode != RTMP_PS_ONEBYTE) {
181 uint32_t timestamp = pkt->timestamp;
182 if (mode != RTMP_PS_TWELVEBYTES)
183 timestamp = pkt->ts_delta;
184 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
185 if (mode != RTMP_PS_FOURBYTES) {
186 bytestream_put_be24(&p, pkt->data_size);
187 bytestream_put_byte(&p, pkt->type);
188 if (mode == RTMP_PS_TWELVEBYTES)
189 bytestream_put_le32(&p, pkt->extra);
191 if (timestamp >= 0xFFFFFF)
192 bytestream_put_be32(&p, timestamp);
195 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
196 prev_pkt[pkt->channel_id].type = pkt->type;
197 prev_pkt[pkt->channel_id].data_size = pkt->data_size;
198 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
199 if (mode != RTMP_PS_TWELVEBYTES) {
200 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
202 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
204 prev_pkt[pkt->channel_id].extra = pkt->extra;
206 url_write(h, pkt_hdr, p-pkt_hdr);
207 while (off < pkt->data_size) {
208 int towrite = FFMIN(chunk_size, pkt->data_size - off);
209 url_write(h, pkt->data + off, towrite);
211 if (off < pkt->data_size) {
212 uint8_t marker = 0xC0 | pkt->channel_id;
213 url_write(h, &marker, 1);
219 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
220 int timestamp, int size)
222 pkt->data = av_malloc(size);
224 return AVERROR(ENOMEM);
225 pkt->data_size = size;
226 pkt->channel_id = channel_id;
228 pkt->timestamp = timestamp;
235 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
239 av_freep(&pkt->data);
243 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
245 const uint8_t *base = data;
247 if (data >= data_end)
250 case AMF_DATA_TYPE_NUMBER: return 9;
251 case AMF_DATA_TYPE_BOOL: return 2;
252 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
253 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
254 case AMF_DATA_TYPE_NULL: return 1;
255 case AMF_DATA_TYPE_ARRAY:
257 case AMF_DATA_TYPE_OBJECT:
259 int size = bytestream_get_be16(&data);
265 if (data + size >= data_end || data + size < data)
268 t = ff_amf_tag_size(data, data_end);
269 if (t < 0 || data + t >= data_end)
274 case AMF_DATA_TYPE_OBJECT_END: return 1;
279 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
280 const uint8_t *name, uint8_t *dst, int dst_size)
282 int namelen = strlen(name);
285 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
286 len = ff_amf_tag_size(data, data_end);
288 len = data_end - data;
291 if (data_end - data < 3)
295 int size = bytestream_get_be16(&data);
298 if (data + size >= data_end || data + size < data)
301 if (size == namelen && !memcmp(data-size, name, namelen)) {
303 case AMF_DATA_TYPE_NUMBER:
304 snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data)));
306 case AMF_DATA_TYPE_BOOL:
307 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
309 case AMF_DATA_TYPE_STRING:
310 len = bytestream_get_be16(&data);
311 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
318 len = ff_amf_tag_size(data, data_end);
319 if (len < 0 || data + len >= data_end || data + len < data)
326 static const char* rtmp_packet_type(int type)
329 case RTMP_PT_CHUNK_SIZE: return "chunk size";
330 case RTMP_PT_BYTES_READ: return "bytes read";
331 case RTMP_PT_PING: return "ping";
332 case RTMP_PT_SERVER_BW: return "server bandwidth";
333 case RTMP_PT_CLIENT_BW: return "client bandwidth";
334 case RTMP_PT_AUDIO: return "audio packet";
335 case RTMP_PT_VIDEO: return "video packet";
336 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
337 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
338 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
339 case RTMP_PT_NOTIFY: return "notification";
340 case RTMP_PT_SHARED_OBJ: return "shared object";
341 case RTMP_PT_INVOKE: return "invoke";
342 case RTMP_PT_METADATA: return "metadata";
343 default: return "unknown";
347 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end)
352 if (data >= data_end)
355 case AMF_DATA_TYPE_NUMBER:
356 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2dbl(AV_RB64(data)));
358 case AMF_DATA_TYPE_BOOL:
359 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
361 case AMF_DATA_TYPE_STRING:
362 case AMF_DATA_TYPE_LONG_STRING:
363 if (data[-1] == AMF_DATA_TYPE_STRING) {
364 size = bytestream_get_be16(&data);
366 size = bytestream_get_be32(data);
368 size = FFMIN(size, 1023);
369 memcpy(buf, data, size);
371 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
373 case AMF_DATA_TYPE_NULL:
374 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
376 case AMF_DATA_TYPE_ARRAY:
378 case AMF_DATA_TYPE_OBJECT:
379 av_log(ctx, AV_LOG_DEBUG, " {\n");
381 int size = bytestream_get_be16(&data);
383 memcpy(buf, data, size);
386 av_log(ctx, AV_LOG_DEBUG, " }\n");
390 if (data + size >= data_end || data + size < data)
393 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
394 ff_amf_tag_contents(ctx, data, data_end);
395 t = ff_amf_tag_size(data, data_end);
396 if (t < 0 || data + t >= data_end)
401 case AMF_DATA_TYPE_OBJECT_END:
402 av_log(ctx, AV_LOG_DEBUG, " }\n");
409 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
411 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
412 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size);
413 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
414 uint8_t *src = p->data, *src_end = p->data + p->data_size;
415 while (src < src_end) {
417 ff_amf_tag_contents(ctx, src, src_end);
418 sz = ff_amf_tag_size(src, src_end);
423 } else if (p->type == RTMP_PT_SERVER_BW){
424 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
425 } else if (p->type == RTMP_PT_CLIENT_BW){
426 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
427 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
429 for (i = 0; i < p->data_size; i++)
430 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
431 av_log(ctx, AV_LOG_DEBUG, "\n");