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)
79 if (ffurl_read(h, &hdr, 1) != 1)
82 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt, hdr);
85 int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
86 RTMPPacket *prev_pkt, uint8_t hdr)
90 int channel_id, timestamp, data_size, offset = 0;
92 enum RTMPPacketType type;
97 channel_id = hdr & 0x3F;
99 if (channel_id < 2) { //special case for channel number >= 64
101 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
103 size += channel_id + 1;
104 channel_id = AV_RL16(buf) + 64;
106 data_size = prev_pkt[channel_id].data_size;
107 type = prev_pkt[channel_id].type;
108 extra = prev_pkt[channel_id].extra;
111 if (hdr == RTMP_PS_ONEBYTE) {
112 timestamp = prev_pkt[channel_id].ts_delta;
114 if (ffurl_read_complete(h, buf, 3) != 3)
117 timestamp = AV_RB24(buf);
118 if (hdr != RTMP_PS_FOURBYTES) {
119 if (ffurl_read_complete(h, buf, 3) != 3)
122 data_size = AV_RB24(buf);
123 if (ffurl_read_complete(h, buf, 1) != 1)
127 if (hdr == RTMP_PS_TWELVEBYTES) {
128 if (ffurl_read_complete(h, buf, 4) != 4)
131 extra = AV_RL32(buf);
134 if (timestamp == 0xFFFFFF) {
135 if (ffurl_read_complete(h, buf, 4) != 4)
137 timestamp = AV_RB32(buf);
140 if (hdr != RTMP_PS_TWELVEBYTES)
141 timestamp += prev_pkt[channel_id].timestamp;
143 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
148 prev_pkt[channel_id].channel_id = channel_id;
149 prev_pkt[channel_id].type = type;
150 prev_pkt[channel_id].data_size = data_size;
151 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
152 prev_pkt[channel_id].timestamp = timestamp;
153 prev_pkt[channel_id].extra = extra;
154 while (data_size > 0) {
155 int toread = FFMIN(data_size, chunk_size);
156 if (ffurl_read_complete(h, p->data + offset, toread) != toread) {
157 ff_rtmp_packet_destroy(p);
160 data_size -= chunk_size;
161 offset += chunk_size;
164 if ((ret = ffurl_read_complete(h, &t, 1)) < 0) { // marker
165 ff_rtmp_packet_destroy(p);
169 if (t != (0xC0 + channel_id))
176 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
177 int chunk_size, RTMPPacket *prev_pkt)
179 uint8_t pkt_hdr[16], *p = pkt_hdr;
180 int mode = RTMP_PS_TWELVEBYTES;
185 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
187 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
188 if (prev_pkt[pkt->channel_id].channel_id &&
189 pkt->extra == prev_pkt[pkt->channel_id].extra) {
190 if (pkt->type == prev_pkt[pkt->channel_id].type &&
191 pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
192 mode = RTMP_PS_FOURBYTES;
193 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
194 mode = RTMP_PS_ONEBYTE;
196 mode = RTMP_PS_EIGHTBYTES;
200 if (pkt->channel_id < 64) {
201 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
202 } else if (pkt->channel_id < 64 + 256) {
203 bytestream_put_byte(&p, 0 | (mode << 6));
204 bytestream_put_byte(&p, pkt->channel_id - 64);
206 bytestream_put_byte(&p, 1 | (mode << 6));
207 bytestream_put_le16(&p, pkt->channel_id - 64);
209 if (mode != RTMP_PS_ONEBYTE) {
210 uint32_t timestamp = pkt->timestamp;
211 if (mode != RTMP_PS_TWELVEBYTES)
212 timestamp = pkt->ts_delta;
213 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
214 if (mode != RTMP_PS_FOURBYTES) {
215 bytestream_put_be24(&p, pkt->data_size);
216 bytestream_put_byte(&p, pkt->type);
217 if (mode == RTMP_PS_TWELVEBYTES)
218 bytestream_put_le32(&p, pkt->extra);
220 if (timestamp >= 0xFFFFFF)
221 bytestream_put_be32(&p, timestamp);
224 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
225 prev_pkt[pkt->channel_id].type = pkt->type;
226 prev_pkt[pkt->channel_id].data_size = pkt->data_size;
227 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
228 if (mode != RTMP_PS_TWELVEBYTES) {
229 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
231 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
233 prev_pkt[pkt->channel_id].extra = pkt->extra;
235 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
237 size = p - pkt_hdr + pkt->data_size;
238 while (off < pkt->data_size) {
239 int towrite = FFMIN(chunk_size, pkt->data_size - off);
240 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
243 if (off < pkt->data_size) {
244 uint8_t marker = 0xC0 | pkt->channel_id;
245 if ((ret = ffurl_write(h, &marker, 1)) < 0)
253 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
254 int timestamp, int size)
257 pkt->data = av_malloc(size);
259 return AVERROR(ENOMEM);
261 pkt->data_size = size;
262 pkt->channel_id = channel_id;
264 pkt->timestamp = timestamp;
271 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
275 av_freep(&pkt->data);
279 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
281 const uint8_t *base = data;
283 if (data >= data_end)
286 case AMF_DATA_TYPE_NUMBER: return 9;
287 case AMF_DATA_TYPE_BOOL: return 2;
288 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
289 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
290 case AMF_DATA_TYPE_NULL: return 1;
291 case AMF_DATA_TYPE_ARRAY:
293 case AMF_DATA_TYPE_OBJECT:
295 int size = bytestream_get_be16(&data);
301 if (data + size >= data_end || data + size < data)
304 t = ff_amf_tag_size(data, data_end);
305 if (t < 0 || data + t >= data_end)
310 case AMF_DATA_TYPE_OBJECT_END: return 1;
315 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
316 const uint8_t *name, uint8_t *dst, int dst_size)
318 int namelen = strlen(name);
321 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
322 len = ff_amf_tag_size(data, data_end);
324 len = data_end - data;
327 if (data_end - data < 3)
331 int size = bytestream_get_be16(&data);
334 if (data + size >= data_end || data + size < data)
337 if (size == namelen && !memcmp(data-size, name, namelen)) {
339 case AMF_DATA_TYPE_NUMBER:
340 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
342 case AMF_DATA_TYPE_BOOL:
343 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
345 case AMF_DATA_TYPE_STRING:
346 len = bytestream_get_be16(&data);
347 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
354 len = ff_amf_tag_size(data, data_end);
355 if (len < 0 || data + len >= data_end || data + len < data)
362 static const char* rtmp_packet_type(int type)
365 case RTMP_PT_CHUNK_SIZE: return "chunk size";
366 case RTMP_PT_BYTES_READ: return "bytes read";
367 case RTMP_PT_PING: return "ping";
368 case RTMP_PT_SERVER_BW: return "server bandwidth";
369 case RTMP_PT_CLIENT_BW: return "client bandwidth";
370 case RTMP_PT_AUDIO: return "audio packet";
371 case RTMP_PT_VIDEO: return "video packet";
372 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
373 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
374 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
375 case RTMP_PT_NOTIFY: return "notification";
376 case RTMP_PT_SHARED_OBJ: return "shared object";
377 case RTMP_PT_INVOKE: return "invoke";
378 case RTMP_PT_METADATA: return "metadata";
379 default: return "unknown";
383 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end)
388 if (data >= data_end)
391 case AMF_DATA_TYPE_NUMBER:
392 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
394 case AMF_DATA_TYPE_BOOL:
395 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
397 case AMF_DATA_TYPE_STRING:
398 case AMF_DATA_TYPE_LONG_STRING:
399 if (data[-1] == AMF_DATA_TYPE_STRING) {
400 size = bytestream_get_be16(&data);
402 size = bytestream_get_be32(&data);
404 size = FFMIN(size, 1023);
405 memcpy(buf, data, size);
407 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
409 case AMF_DATA_TYPE_NULL:
410 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
412 case AMF_DATA_TYPE_ARRAY:
414 case AMF_DATA_TYPE_OBJECT:
415 av_log(ctx, AV_LOG_DEBUG, " {\n");
417 int size = bytestream_get_be16(&data);
419 memcpy(buf, data, size);
422 av_log(ctx, AV_LOG_DEBUG, " }\n");
426 if (data + size >= data_end || data + size < data)
429 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
430 ff_amf_tag_contents(ctx, data, data_end);
431 t = ff_amf_tag_size(data, data_end);
432 if (t < 0 || data + t >= data_end)
437 case AMF_DATA_TYPE_OBJECT_END:
438 av_log(ctx, AV_LOG_DEBUG, " }\n");
445 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
447 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
448 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size);
449 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
450 uint8_t *src = p->data, *src_end = p->data + p->data_size;
451 while (src < src_end) {
453 ff_amf_tag_contents(ctx, src, src_end);
454 sz = ff_amf_tag_size(src, src_end);
459 } else if (p->type == RTMP_PT_SERVER_BW){
460 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
461 } else if (p->type == RTMP_PT_CLIENT_BW){
462 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
463 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
465 for (i = 0; i < p->data_size; i++)
466 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
467 av_log(ctx, AV_LOG_DEBUG, "\n");