1/* 2 * RTMP input format 3 * Copyright (c) 2009 Kostya Shishkov 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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. 11 * 12 * Libav 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. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavcodec/bytestream.h" 23#include "libavutil/avstring.h" 24#include "libavutil/intfloat.h" 25#include "avformat.h" 26 27#include "rtmppkt.h" 28#include "flv.h" 29#include "url.h" 30 31void ff_amf_write_bool(uint8_t **dst, int val) 32{ 33 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL); 34 bytestream_put_byte(dst, val); 35} 36 37void ff_amf_write_number(uint8_t **dst, double val) 38{ 39 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER); 40 bytestream_put_be64(dst, av_double2int(val)); 41} 42 43void ff_amf_write_string(uint8_t **dst, const char *str) 44{ 45 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING); 46 bytestream_put_be16(dst, strlen(str)); 47 bytestream_put_buffer(dst, str, strlen(str)); 48} 49 50void ff_amf_write_null(uint8_t **dst) 51{ 52 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL); 53} 54 55void ff_amf_write_object_start(uint8_t **dst) 56{ 57 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT); 58} 59 60void ff_amf_write_field_name(uint8_t **dst, const char *str) 61{ 62 bytestream_put_be16(dst, strlen(str)); 63 bytestream_put_buffer(dst, str, strlen(str)); 64} 65 66void ff_amf_write_object_end(uint8_t **dst) 67{ 68 /* first two bytes are field name length = 0, 69 * AMF object should end with it and end marker 70 */ 71 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END); 72} 73 74int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p, 75 int chunk_size, RTMPPacket *prev_pkt) 76{ 77 uint8_t hdr, t, buf[16]; 78 int channel_id, timestamp, data_size, offset = 0; 79 uint32_t extra = 0; 80 enum RTMPPacketType type; 81 int size = 0; 82 83 if (ffurl_read(h, &hdr, 1) != 1) 84 return AVERROR(EIO); 85 size++; 86 channel_id = hdr & 0x3F; 87 88 if (channel_id < 2) { //special case for channel number >= 64 89 buf[1] = 0; 90 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1) 91 return AVERROR(EIO); 92 size += channel_id + 1; 93 channel_id = AV_RL16(buf) + 64; 94 } 95 data_size = prev_pkt[channel_id].data_size; 96 type = prev_pkt[channel_id].type; 97 extra = prev_pkt[channel_id].extra; 98 99 hdr >>= 6; 100 if (hdr == RTMP_PS_ONEBYTE) { 101 timestamp = prev_pkt[channel_id].ts_delta; 102 } else { 103 if (ffurl_read_complete(h, buf, 3) != 3) 104 return AVERROR(EIO); 105 size += 3; 106 timestamp = AV_RB24(buf); 107 if (hdr != RTMP_PS_FOURBYTES) { 108 if (ffurl_read_complete(h, buf, 3) != 3) 109 return AVERROR(EIO); 110 size += 3; 111 data_size = AV_RB24(buf); 112 if (ffurl_read_complete(h, buf, 1) != 1) 113 return AVERROR(EIO); 114 size++; 115 type = buf[0]; 116 if (hdr == RTMP_PS_TWELVEBYTES) { 117 if (ffurl_read_complete(h, buf, 4) != 4) 118 return AVERROR(EIO); 119 size += 4; 120 extra = AV_RL32(buf); 121 } 122 } 123 if (timestamp == 0xFFFFFF) { 124 if (ffurl_read_complete(h, buf, 4) != 4) 125 return AVERROR(EIO); 126 timestamp = AV_RB32(buf); 127 } 128 } 129 if (hdr != RTMP_PS_TWELVEBYTES) 130 timestamp += prev_pkt[channel_id].timestamp; 131 132 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size)) 133 return -1; 134 p->extra = extra; 135 // save history 136 prev_pkt[channel_id].channel_id = channel_id; 137 prev_pkt[channel_id].type = type; 138 prev_pkt[channel_id].data_size = data_size; 139 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp; 140 prev_pkt[channel_id].timestamp = timestamp; 141 prev_pkt[channel_id].extra = extra; 142 while (data_size > 0) { 143 int toread = FFMIN(data_size, chunk_size); 144 if (ffurl_read_complete(h, p->data + offset, toread) != toread) { 145 ff_rtmp_packet_destroy(p); 146 return AVERROR(EIO); 147 } 148 data_size -= chunk_size; 149 offset += chunk_size; 150 size += chunk_size; 151 if (data_size > 0) { 152 ffurl_read_complete(h, &t, 1); //marker 153 size++; 154 if (t != (0xC0 + channel_id)) 155 return -1; 156 } 157 } 158 return size; 159} 160 161int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt, 162 int chunk_size, RTMPPacket *prev_pkt) 163{ 164 uint8_t pkt_hdr[16], *p = pkt_hdr; 165 int mode = RTMP_PS_TWELVEBYTES; 166 int off = 0; 167 int size = 0; 168 169 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp; 170 171 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr. 172 if (prev_pkt[pkt->channel_id].channel_id && 173 pkt->extra == prev_pkt[pkt->channel_id].extra) { 174 if (pkt->type == prev_pkt[pkt->channel_id].type && 175 pkt->data_size == prev_pkt[pkt->channel_id].data_size) { 176 mode = RTMP_PS_FOURBYTES; 177 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta) 178 mode = RTMP_PS_ONEBYTE; 179 } else { 180 mode = RTMP_PS_EIGHTBYTES; 181 } 182 } 183 184 if (pkt->channel_id < 64) { 185 bytestream_put_byte(&p, pkt->channel_id | (mode << 6)); 186 } else if (pkt->channel_id < 64 + 256) { 187 bytestream_put_byte(&p, 0 | (mode << 6)); 188 bytestream_put_byte(&p, pkt->channel_id - 64); 189 } else { 190 bytestream_put_byte(&p, 1 | (mode << 6)); 191 bytestream_put_le16(&p, pkt->channel_id - 64); 192 } 193 if (mode != RTMP_PS_ONEBYTE) { 194 uint32_t timestamp = pkt->timestamp; 195 if (mode != RTMP_PS_TWELVEBYTES) 196 timestamp = pkt->ts_delta; 197 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp); 198 if (mode != RTMP_PS_FOURBYTES) { 199 bytestream_put_be24(&p, pkt->data_size); 200 bytestream_put_byte(&p, pkt->type); 201 if (mode == RTMP_PS_TWELVEBYTES) 202 bytestream_put_le32(&p, pkt->extra); 203 } 204 if (timestamp >= 0xFFFFFF) 205 bytestream_put_be32(&p, timestamp); 206 } 207 // save history 208 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id; 209 prev_pkt[pkt->channel_id].type = pkt->type; 210 prev_pkt[pkt->channel_id].data_size = pkt->data_size; 211 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp; 212 if (mode != RTMP_PS_TWELVEBYTES) { 213 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta; 214 } else { 215 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp; 216 } 217 prev_pkt[pkt->channel_id].extra = pkt->extra; 218 219 ffurl_write(h, pkt_hdr, p-pkt_hdr); 220 size = p - pkt_hdr + pkt->data_size; 221 while (off < pkt->data_size) { 222 int towrite = FFMIN(chunk_size, pkt->data_size - off); 223 ffurl_write(h, pkt->data + off, towrite); 224 off += towrite; 225 if (off < pkt->data_size) { 226 uint8_t marker = 0xC0 | pkt->channel_id; 227 ffurl_write(h, &marker, 1); 228 size++; 229 } 230 } 231 return size; 232} 233 234int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type, 235 int timestamp, int size) 236{ 237 if (size) { 238 pkt->data = av_malloc(size); 239 if (!pkt->data) 240 return AVERROR(ENOMEM); 241 } 242 pkt->data_size = size; 243 pkt->channel_id = channel_id; 244 pkt->type = type; 245 pkt->timestamp = timestamp; 246 pkt->extra = 0; 247 pkt->ts_delta = 0; 248 249 return 0; 250} 251 252void ff_rtmp_packet_destroy(RTMPPacket *pkt) 253{ 254 if (!pkt) 255 return; 256 av_freep(&pkt->data); 257 pkt->data_size = 0; 258} 259 260int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end) 261{ 262 const uint8_t *base = data; 263 264 if (data >= data_end) 265 return -1; 266 switch (*data++) { 267 case AMF_DATA_TYPE_NUMBER: return 9; 268 case AMF_DATA_TYPE_BOOL: return 2; 269 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data); 270 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data); 271 case AMF_DATA_TYPE_NULL: return 1; 272 case AMF_DATA_TYPE_ARRAY: 273 data += 4; 274 case AMF_DATA_TYPE_OBJECT: 275 for (;;) { 276 int size = bytestream_get_be16(&data); 277 int t; 278 if (!size) { 279 data++; 280 break; 281 } 282 if (data + size >= data_end || data + size < data) 283 return -1; 284 data += size; 285 t = ff_amf_tag_size(data, data_end); 286 if (t < 0 || data + t >= data_end) 287 return -1; 288 data += t; 289 } 290 return data - base; 291 case AMF_DATA_TYPE_OBJECT_END: return 1; 292 default: return -1; 293 } 294} 295 296int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end, 297 const uint8_t *name, uint8_t *dst, int dst_size) 298{ 299 int namelen = strlen(name); 300 int len; 301 302 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) { 303 len = ff_amf_tag_size(data, data_end); 304 if (len < 0) 305 len = data_end - data; 306 data += len; 307 } 308 if (data_end - data < 3) 309 return -1; 310 data++; 311 for (;;) { 312 int size = bytestream_get_be16(&data); 313 if (!size) 314 break; 315 if (data + size >= data_end || data + size < data) 316 return -1; 317 data += size; 318 if (size == namelen && !memcmp(data-size, name, namelen)) { 319 switch (*data++) { 320 case AMF_DATA_TYPE_NUMBER: 321 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data))); 322 break; 323 case AMF_DATA_TYPE_BOOL: 324 snprintf(dst, dst_size, "%s", *data ? "true" : "false"); 325 break; 326 case AMF_DATA_TYPE_STRING: 327 len = bytestream_get_be16(&data); 328 av_strlcpy(dst, data, FFMIN(len+1, dst_size)); 329 break; 330 default: 331 return -1; 332 } 333 return 0; 334 } 335 len = ff_amf_tag_size(data, data_end); 336 if (len < 0 || data + len >= data_end || data + len < data) 337 return -1; 338 data += len; 339 } 340 return -1; 341} 342 343static const char* rtmp_packet_type(int type) 344{ 345 switch (type) { 346 case RTMP_PT_CHUNK_SIZE: return "chunk size"; 347 case RTMP_PT_BYTES_READ: return "bytes read"; 348 case RTMP_PT_PING: return "ping"; 349 case RTMP_PT_SERVER_BW: return "server bandwidth"; 350 case RTMP_PT_CLIENT_BW: return "client bandwidth"; 351 case RTMP_PT_AUDIO: return "audio packet"; 352 case RTMP_PT_VIDEO: return "video packet"; 353 case RTMP_PT_FLEX_STREAM: return "Flex shared stream"; 354 case RTMP_PT_FLEX_OBJECT: return "Flex shared object"; 355 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message"; 356 case RTMP_PT_NOTIFY: return "notification"; 357 case RTMP_PT_SHARED_OBJ: return "shared object"; 358 case RTMP_PT_INVOKE: return "invoke"; 359 case RTMP_PT_METADATA: return "metadata"; 360 default: return "unknown"; 361 } 362} 363 364static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end) 365{ 366 int size; 367 char buf[1024]; 368 369 if (data >= data_end) 370 return; 371 switch (*data++) { 372 case AMF_DATA_TYPE_NUMBER: 373 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data))); 374 return; 375 case AMF_DATA_TYPE_BOOL: 376 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data); 377 return; 378 case AMF_DATA_TYPE_STRING: 379 case AMF_DATA_TYPE_LONG_STRING: 380 if (data[-1] == AMF_DATA_TYPE_STRING) { 381 size = bytestream_get_be16(&data); 382 } else { 383 size = bytestream_get_be32(&data); 384 } 385 size = FFMIN(size, 1023); 386 memcpy(buf, data, size); 387 buf[size] = 0; 388 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf); 389 return; 390 case AMF_DATA_TYPE_NULL: 391 av_log(ctx, AV_LOG_DEBUG, " NULL\n"); 392 return; 393 case AMF_DATA_TYPE_ARRAY: 394 data += 4; 395 case AMF_DATA_TYPE_OBJECT: 396 av_log(ctx, AV_LOG_DEBUG, " {\n"); 397 for (;;) { 398 int size = bytestream_get_be16(&data); 399 int t; 400 memcpy(buf, data, size); 401 buf[size] = 0; 402 if (!size) { 403 av_log(ctx, AV_LOG_DEBUG, " }\n"); 404 data++; 405 break; 406 } 407 if (data + size >= data_end || data + size < data) 408 return; 409 data += size; 410 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf); 411 ff_amf_tag_contents(ctx, data, data_end); 412 t = ff_amf_tag_size(data, data_end); 413 if (t < 0 || data + t >= data_end) 414 return; 415 data += t; 416 } 417 return; 418 case AMF_DATA_TYPE_OBJECT_END: 419 av_log(ctx, AV_LOG_DEBUG, " }\n"); 420 return; 421 default: 422 return; 423 } 424} 425 426void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p) 427{ 428 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n", 429 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size); 430 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) { 431 uint8_t *src = p->data, *src_end = p->data + p->data_size; 432 while (src < src_end) { 433 int sz; 434 ff_amf_tag_contents(ctx, src, src_end); 435 sz = ff_amf_tag_size(src, src_end); 436 if (sz < 0) 437 break; 438 src += sz; 439 } 440 } else if (p->type == RTMP_PT_SERVER_BW){ 441 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data)); 442 } else if (p->type == RTMP_PT_CLIENT_BW){ 443 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data)); 444 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) { 445 int i; 446 for (i = 0; i < p->data_size; i++) 447 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]); 448 av_log(ctx, AV_LOG_DEBUG, "\n"); 449 } 450} 451