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"
30 void ff_amf_write_bool(uint8_t **dst, int val)
32 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
33 bytestream_put_byte(dst, val);
36 void ff_amf_write_number(uint8_t **dst, double val)
38 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
39 bytestream_put_be64(dst, av_dbl2int(val));
42 void ff_amf_write_string(uint8_t **dst, const char *str)
44 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
45 bytestream_put_be16(dst, strlen(str));
46 bytestream_put_buffer(dst, str, strlen(str));
49 void ff_amf_write_null(uint8_t **dst)
51 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
54 void ff_amf_write_object_start(uint8_t **dst)
56 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
59 void ff_amf_write_field_name(uint8_t **dst, const char *str)
61 bytestream_put_be16(dst, strlen(str));
62 bytestream_put_buffer(dst, str, strlen(str));
65 void ff_amf_write_object_end(uint8_t **dst)
67 /* first two bytes are field name length = 0,
68 * AMF object should end with it and end marker
70 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
73 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
74 int chunk_size, RTMPPacket *prev_pkt)
76 uint8_t hdr, t, buf[16];
77 int channel_id, timestamp, data_size, offset = 0;
79 enum RTMPPacketType type;
82 if (ffurl_read(h, &hdr, 1) != 1)
85 channel_id = hdr & 0x3F;
87 if (channel_id < 2) { //special case for channel number >= 64
89 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
91 size += channel_id + 1;
92 channel_id = AV_RL16(buf) + 64;
94 data_size = prev_pkt[channel_id].data_size;
95 type = prev_pkt[channel_id].type;
96 extra = prev_pkt[channel_id].extra;
99 if (hdr == RTMP_PS_ONEBYTE) {
100 timestamp = prev_pkt[channel_id].ts_delta;
102 if (ffurl_read_complete(h, buf, 3) != 3)
105 timestamp = AV_RB24(buf);
106 if (hdr != RTMP_PS_FOURBYTES) {
107 if (ffurl_read_complete(h, buf, 3) != 3)
110 data_size = AV_RB24(buf);
111 if (ffurl_read_complete(h, buf, 1) != 1)
115 if (hdr == RTMP_PS_TWELVEBYTES) {
116 if (ffurl_read_complete(h, buf, 4) != 4)
119 extra = AV_RL32(buf);
122 if (timestamp == 0xFFFFFF) {
123 if (ffurl_read_complete(h, buf, 4) != 4)
125 timestamp = AV_RB32(buf);
128 if (hdr != RTMP_PS_TWELVEBYTES)
129 timestamp += prev_pkt[channel_id].timestamp;
131 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size))
135 prev_pkt[channel_id].channel_id = channel_id;
136 prev_pkt[channel_id].type = type;
137 prev_pkt[channel_id].data_size = data_size;
138 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
139 prev_pkt[channel_id].timestamp = timestamp;
140 prev_pkt[channel_id].extra = extra;
141 while (data_size > 0) {
142 int toread = FFMIN(data_size, chunk_size);
143 if (ffurl_read_complete(h, p->data + offset, toread) != toread) {
144 ff_rtmp_packet_destroy(p);
147 data_size -= chunk_size;
148 offset += chunk_size;
151 ffurl_read_complete(h, &t, 1); //marker
153 if (t != (0xC0 + channel_id))
160 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
161 int chunk_size, RTMPPacket *prev_pkt)
163 uint8_t pkt_hdr[16], *p = pkt_hdr;
164 int mode = RTMP_PS_TWELVEBYTES;
168 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
170 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
171 if (prev_pkt[pkt->channel_id].channel_id &&
172 pkt->extra == prev_pkt[pkt->channel_id].extra) {
173 if (pkt->type == prev_pkt[pkt->channel_id].type &&
174 pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
175 mode = RTMP_PS_FOURBYTES;
176 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
177 mode = RTMP_PS_ONEBYTE;
179 mode = RTMP_PS_EIGHTBYTES;
183 if (pkt->channel_id < 64) {
184 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
185 } else if (pkt->channel_id < 64 + 256) {
186 bytestream_put_byte(&p, 0 | (mode << 6));
187 bytestream_put_byte(&p, pkt->channel_id - 64);
189 bytestream_put_byte(&p, 1 | (mode << 6));
190 bytestream_put_le16(&p, pkt->channel_id - 64);
192 if (mode != RTMP_PS_ONEBYTE) {
193 uint32_t timestamp = pkt->timestamp;
194 if (mode != RTMP_PS_TWELVEBYTES)
195 timestamp = pkt->ts_delta;
196 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
197 if (mode != RTMP_PS_FOURBYTES) {
198 bytestream_put_be24(&p, pkt->data_size);
199 bytestream_put_byte(&p, pkt->type);
200 if (mode == RTMP_PS_TWELVEBYTES)
201 bytestream_put_le32(&p, pkt->extra);
203 if (timestamp >= 0xFFFFFF)
204 bytestream_put_be32(&p, timestamp);
207 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
208 prev_pkt[pkt->channel_id].type = pkt->type;
209 prev_pkt[pkt->channel_id].data_size = pkt->data_size;
210 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
211 if (mode != RTMP_PS_TWELVEBYTES) {
212 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
214 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
216 prev_pkt[pkt->channel_id].extra = pkt->extra;
218 ffurl_write(h, pkt_hdr, p-pkt_hdr);
219 size = p - pkt_hdr + pkt->data_size;
220 while (off < pkt->data_size) {
221 int towrite = FFMIN(chunk_size, pkt->data_size - off);
222 ffurl_write(h, pkt->data + off, towrite);
224 if (off < pkt->data_size) {
225 uint8_t marker = 0xC0 | pkt->channel_id;
226 ffurl_write(h, &marker, 1);
233 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
234 int timestamp, int size)
237 pkt->data = av_malloc(size);
239 return AVERROR(ENOMEM);
241 pkt->data_size = size;
242 pkt->channel_id = channel_id;
244 pkt->timestamp = timestamp;
251 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
255 av_freep(&pkt->data);
259 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
261 const uint8_t *base = data;
263 if (data >= data_end)
266 case AMF_DATA_TYPE_NUMBER: return 9;
267 case AMF_DATA_TYPE_BOOL: return 2;
268 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
269 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
270 case AMF_DATA_TYPE_NULL: return 1;
271 case AMF_DATA_TYPE_ARRAY:
273 case AMF_DATA_TYPE_OBJECT:
275 int size = bytestream_get_be16(&data);
281 if (data + size >= data_end || data + size < data)
284 t = ff_amf_tag_size(data, data_end);
285 if (t < 0 || data + t >= data_end)
290 case AMF_DATA_TYPE_OBJECT_END: return 1;
295 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
296 const uint8_t *name, uint8_t *dst, int dst_size)
298 int namelen = strlen(name);
301 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
302 len = ff_amf_tag_size(data, data_end);
304 len = data_end - data;
307 if (data_end - data < 3)
311 int size = bytestream_get_be16(&data);
314 if (data + size >= data_end || data + size < data)
317 if (size == namelen && !memcmp(data-size, name, namelen)) {
319 case AMF_DATA_TYPE_NUMBER:
320 snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data)));
322 case AMF_DATA_TYPE_BOOL:
323 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
325 case AMF_DATA_TYPE_STRING:
326 len = bytestream_get_be16(&data);
327 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
334 len = ff_amf_tag_size(data, data_end);
335 if (len < 0 || data + len >= data_end || data + len < data)
342 static const char* rtmp_packet_type(int type)
345 case RTMP_PT_CHUNK_SIZE: return "chunk size";
346 case RTMP_PT_BYTES_READ: return "bytes read";
347 case RTMP_PT_PING: return "ping";
348 case RTMP_PT_SERVER_BW: return "server bandwidth";
349 case RTMP_PT_CLIENT_BW: return "client bandwidth";
350 case RTMP_PT_AUDIO: return "audio packet";
351 case RTMP_PT_VIDEO: return "video packet";
352 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
353 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
354 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
355 case RTMP_PT_NOTIFY: return "notification";
356 case RTMP_PT_SHARED_OBJ: return "shared object";
357 case RTMP_PT_INVOKE: return "invoke";
358 case RTMP_PT_METADATA: return "metadata";
359 default: return "unknown";
363 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end)
368 if (data >= data_end)
371 case AMF_DATA_TYPE_NUMBER:
372 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2dbl(AV_RB64(data)));
374 case AMF_DATA_TYPE_BOOL:
375 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
377 case AMF_DATA_TYPE_STRING:
378 case AMF_DATA_TYPE_LONG_STRING:
379 if (data[-1] == AMF_DATA_TYPE_STRING) {
380 size = bytestream_get_be16(&data);
382 size = bytestream_get_be32(&data);
384 size = FFMIN(size, 1023);
385 memcpy(buf, data, size);
387 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
389 case AMF_DATA_TYPE_NULL:
390 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
392 case AMF_DATA_TYPE_ARRAY:
394 case AMF_DATA_TYPE_OBJECT:
395 av_log(ctx, AV_LOG_DEBUG, " {\n");
397 int size = bytestream_get_be16(&data);
399 memcpy(buf, data, size);
402 av_log(ctx, AV_LOG_DEBUG, " }\n");
406 if (data + size >= data_end || data + size < data)
409 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
410 ff_amf_tag_contents(ctx, data, data_end);
411 t = ff_amf_tag_size(data, data_end);
412 if (t < 0 || data + t >= data_end)
417 case AMF_DATA_TYPE_OBJECT_END:
418 av_log(ctx, AV_LOG_DEBUG, " }\n");
425 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
427 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
428 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size);
429 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
430 uint8_t *src = p->data, *src_end = p->data + p->data_size;
431 while (src < src_end) {
433 ff_amf_tag_contents(ctx, src, src_end);
434 sz = ff_amf_tag_size(src, src_end);
439 } else if (p->type == RTMP_PT_SERVER_BW){
440 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
441 } else if (p->type == RTMP_PT_CLIENT_BW){
442 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
443 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
445 for (i = 0; i < p->data_size; i++)
446 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
447 av_log(ctx, AV_LOG_DEBUG, "\n");