00001 /* 00002 * RTMP input format 00003 * Copyright (c) 2009 Kostya Shishkov 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "libavcodec/bytestream.h" 00023 #include "libavutil/avstring.h" 00024 #include "libavutil/intfloat.h" 00025 #include "avformat.h" 00026 00027 #include "rtmppkt.h" 00028 #include "flv.h" 00029 #include "url.h" 00030 00031 void ff_amf_write_bool(uint8_t **dst, int val) 00032 { 00033 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL); 00034 bytestream_put_byte(dst, val); 00035 } 00036 00037 void ff_amf_write_number(uint8_t **dst, double val) 00038 { 00039 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER); 00040 bytestream_put_be64(dst, av_double2int(val)); 00041 } 00042 00043 void ff_amf_write_string(uint8_t **dst, const char *str) 00044 { 00045 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING); 00046 bytestream_put_be16(dst, strlen(str)); 00047 bytestream_put_buffer(dst, str, strlen(str)); 00048 } 00049 00050 void ff_amf_write_null(uint8_t **dst) 00051 { 00052 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL); 00053 } 00054 00055 void ff_amf_write_object_start(uint8_t **dst) 00056 { 00057 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT); 00058 } 00059 00060 void ff_amf_write_field_name(uint8_t **dst, const char *str) 00061 { 00062 bytestream_put_be16(dst, strlen(str)); 00063 bytestream_put_buffer(dst, str, strlen(str)); 00064 } 00065 00066 void ff_amf_write_object_end(uint8_t **dst) 00067 { 00068 /* first two bytes are field name length = 0, 00069 * AMF object should end with it and end marker 00070 */ 00071 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END); 00072 } 00073 00074 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p, 00075 int chunk_size, RTMPPacket *prev_pkt) 00076 { 00077 uint8_t hdr, t, buf[16]; 00078 int channel_id, timestamp, data_size, offset = 0; 00079 uint32_t extra = 0; 00080 enum RTMPPacketType type; 00081 int size = 0; 00082 00083 if (ffurl_read(h, &hdr, 1) != 1) 00084 return AVERROR(EIO); 00085 size++; 00086 channel_id = hdr & 0x3F; 00087 00088 if (channel_id < 2) { //special case for channel number >= 64 00089 buf[1] = 0; 00090 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1) 00091 return AVERROR(EIO); 00092 size += channel_id + 1; 00093 channel_id = AV_RL16(buf) + 64; 00094 } 00095 data_size = prev_pkt[channel_id].data_size; 00096 type = prev_pkt[channel_id].type; 00097 extra = prev_pkt[channel_id].extra; 00098 00099 hdr >>= 6; 00100 if (hdr == RTMP_PS_ONEBYTE) { 00101 timestamp = prev_pkt[channel_id].ts_delta; 00102 } else { 00103 if (ffurl_read_complete(h, buf, 3) != 3) 00104 return AVERROR(EIO); 00105 size += 3; 00106 timestamp = AV_RB24(buf); 00107 if (hdr != RTMP_PS_FOURBYTES) { 00108 if (ffurl_read_complete(h, buf, 3) != 3) 00109 return AVERROR(EIO); 00110 size += 3; 00111 data_size = AV_RB24(buf); 00112 if (ffurl_read_complete(h, buf, 1) != 1) 00113 return AVERROR(EIO); 00114 size++; 00115 type = buf[0]; 00116 if (hdr == RTMP_PS_TWELVEBYTES) { 00117 if (ffurl_read_complete(h, buf, 4) != 4) 00118 return AVERROR(EIO); 00119 size += 4; 00120 extra = AV_RL32(buf); 00121 } 00122 } 00123 if (timestamp == 0xFFFFFF) { 00124 if (ffurl_read_complete(h, buf, 4) != 4) 00125 return AVERROR(EIO); 00126 timestamp = AV_RB32(buf); 00127 } 00128 } 00129 if (hdr != RTMP_PS_TWELVEBYTES) 00130 timestamp += prev_pkt[channel_id].timestamp; 00131 00132 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size)) 00133 return -1; 00134 p->extra = extra; 00135 // save history 00136 prev_pkt[channel_id].channel_id = channel_id; 00137 prev_pkt[channel_id].type = type; 00138 prev_pkt[channel_id].data_size = data_size; 00139 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp; 00140 prev_pkt[channel_id].timestamp = timestamp; 00141 prev_pkt[channel_id].extra = extra; 00142 while (data_size > 0) { 00143 int toread = FFMIN(data_size, chunk_size); 00144 if (ffurl_read_complete(h, p->data + offset, toread) != toread) { 00145 ff_rtmp_packet_destroy(p); 00146 return AVERROR(EIO); 00147 } 00148 data_size -= chunk_size; 00149 offset += chunk_size; 00150 size += chunk_size; 00151 if (data_size > 0) { 00152 ffurl_read_complete(h, &t, 1); //marker 00153 size++; 00154 if (t != (0xC0 + channel_id)) 00155 return -1; 00156 } 00157 } 00158 return size; 00159 } 00160 00161 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt, 00162 int chunk_size, RTMPPacket *prev_pkt) 00163 { 00164 uint8_t pkt_hdr[16], *p = pkt_hdr; 00165 int mode = RTMP_PS_TWELVEBYTES; 00166 int off = 0; 00167 int size = 0; 00168 00169 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp; 00170 00171 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr. 00172 if (prev_pkt[pkt->channel_id].channel_id && 00173 pkt->extra == prev_pkt[pkt->channel_id].extra) { 00174 if (pkt->type == prev_pkt[pkt->channel_id].type && 00175 pkt->data_size == prev_pkt[pkt->channel_id].data_size) { 00176 mode = RTMP_PS_FOURBYTES; 00177 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta) 00178 mode = RTMP_PS_ONEBYTE; 00179 } else { 00180 mode = RTMP_PS_EIGHTBYTES; 00181 } 00182 } 00183 00184 if (pkt->channel_id < 64) { 00185 bytestream_put_byte(&p, pkt->channel_id | (mode << 6)); 00186 } else if (pkt->channel_id < 64 + 256) { 00187 bytestream_put_byte(&p, 0 | (mode << 6)); 00188 bytestream_put_byte(&p, pkt->channel_id - 64); 00189 } else { 00190 bytestream_put_byte(&p, 1 | (mode << 6)); 00191 bytestream_put_le16(&p, pkt->channel_id - 64); 00192 } 00193 if (mode != RTMP_PS_ONEBYTE) { 00194 uint32_t timestamp = pkt->timestamp; 00195 if (mode != RTMP_PS_TWELVEBYTES) 00196 timestamp = pkt->ts_delta; 00197 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp); 00198 if (mode != RTMP_PS_FOURBYTES) { 00199 bytestream_put_be24(&p, pkt->data_size); 00200 bytestream_put_byte(&p, pkt->type); 00201 if (mode == RTMP_PS_TWELVEBYTES) 00202 bytestream_put_le32(&p, pkt->extra); 00203 } 00204 if (timestamp >= 0xFFFFFF) 00205 bytestream_put_be32(&p, timestamp); 00206 } 00207 // save history 00208 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id; 00209 prev_pkt[pkt->channel_id].type = pkt->type; 00210 prev_pkt[pkt->channel_id].data_size = pkt->data_size; 00211 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp; 00212 if (mode != RTMP_PS_TWELVEBYTES) { 00213 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta; 00214 } else { 00215 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp; 00216 } 00217 prev_pkt[pkt->channel_id].extra = pkt->extra; 00218 00219 ffurl_write(h, pkt_hdr, p-pkt_hdr); 00220 size = p - pkt_hdr + pkt->data_size; 00221 while (off < pkt->data_size) { 00222 int towrite = FFMIN(chunk_size, pkt->data_size - off); 00223 ffurl_write(h, pkt->data + off, towrite); 00224 off += towrite; 00225 if (off < pkt->data_size) { 00226 uint8_t marker = 0xC0 | pkt->channel_id; 00227 ffurl_write(h, &marker, 1); 00228 size++; 00229 } 00230 } 00231 return size; 00232 } 00233 00234 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type, 00235 int timestamp, int size) 00236 { 00237 if (size) { 00238 pkt->data = av_malloc(size); 00239 if (!pkt->data) 00240 return AVERROR(ENOMEM); 00241 } 00242 pkt->data_size = size; 00243 pkt->channel_id = channel_id; 00244 pkt->type = type; 00245 pkt->timestamp = timestamp; 00246 pkt->extra = 0; 00247 pkt->ts_delta = 0; 00248 00249 return 0; 00250 } 00251 00252 void ff_rtmp_packet_destroy(RTMPPacket *pkt) 00253 { 00254 if (!pkt) 00255 return; 00256 av_freep(&pkt->data); 00257 pkt->data_size = 0; 00258 } 00259 00260 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end) 00261 { 00262 const uint8_t *base = data; 00263 00264 if (data >= data_end) 00265 return -1; 00266 switch (*data++) { 00267 case AMF_DATA_TYPE_NUMBER: return 9; 00268 case AMF_DATA_TYPE_BOOL: return 2; 00269 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data); 00270 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data); 00271 case AMF_DATA_TYPE_NULL: return 1; 00272 case AMF_DATA_TYPE_ARRAY: 00273 data += 4; 00274 case AMF_DATA_TYPE_OBJECT: 00275 for (;;) { 00276 int size = bytestream_get_be16(&data); 00277 int t; 00278 if (!size) { 00279 data++; 00280 break; 00281 } 00282 if (data + size >= data_end || data + size < data) 00283 return -1; 00284 data += size; 00285 t = ff_amf_tag_size(data, data_end); 00286 if (t < 0 || data + t >= data_end) 00287 return -1; 00288 data += t; 00289 } 00290 return data - base; 00291 case AMF_DATA_TYPE_OBJECT_END: return 1; 00292 default: return -1; 00293 } 00294 } 00295 00296 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end, 00297 const uint8_t *name, uint8_t *dst, int dst_size) 00298 { 00299 int namelen = strlen(name); 00300 int len; 00301 00302 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) { 00303 len = ff_amf_tag_size(data, data_end); 00304 if (len < 0) 00305 len = data_end - data; 00306 data += len; 00307 } 00308 if (data_end - data < 3) 00309 return -1; 00310 data++; 00311 for (;;) { 00312 int size = bytestream_get_be16(&data); 00313 if (!size) 00314 break; 00315 if (data + size >= data_end || data + size < data) 00316 return -1; 00317 data += size; 00318 if (size == namelen && !memcmp(data-size, name, namelen)) { 00319 switch (*data++) { 00320 case AMF_DATA_TYPE_NUMBER: 00321 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data))); 00322 break; 00323 case AMF_DATA_TYPE_BOOL: 00324 snprintf(dst, dst_size, "%s", *data ? "true" : "false"); 00325 break; 00326 case AMF_DATA_TYPE_STRING: 00327 len = bytestream_get_be16(&data); 00328 av_strlcpy(dst, data, FFMIN(len+1, dst_size)); 00329 break; 00330 default: 00331 return -1; 00332 } 00333 return 0; 00334 } 00335 len = ff_amf_tag_size(data, data_end); 00336 if (len < 0 || data + len >= data_end || data + len < data) 00337 return -1; 00338 data += len; 00339 } 00340 return -1; 00341 } 00342 00343 static const char* rtmp_packet_type(int type) 00344 { 00345 switch (type) { 00346 case RTMP_PT_CHUNK_SIZE: return "chunk size"; 00347 case RTMP_PT_BYTES_READ: return "bytes read"; 00348 case RTMP_PT_PING: return "ping"; 00349 case RTMP_PT_SERVER_BW: return "server bandwidth"; 00350 case RTMP_PT_CLIENT_BW: return "client bandwidth"; 00351 case RTMP_PT_AUDIO: return "audio packet"; 00352 case RTMP_PT_VIDEO: return "video packet"; 00353 case RTMP_PT_FLEX_STREAM: return "Flex shared stream"; 00354 case RTMP_PT_FLEX_OBJECT: return "Flex shared object"; 00355 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message"; 00356 case RTMP_PT_NOTIFY: return "notification"; 00357 case RTMP_PT_SHARED_OBJ: return "shared object"; 00358 case RTMP_PT_INVOKE: return "invoke"; 00359 case RTMP_PT_METADATA: return "metadata"; 00360 default: return "unknown"; 00361 } 00362 } 00363 00364 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end) 00365 { 00366 int size; 00367 char buf[1024]; 00368 00369 if (data >= data_end) 00370 return; 00371 switch (*data++) { 00372 case AMF_DATA_TYPE_NUMBER: 00373 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data))); 00374 return; 00375 case AMF_DATA_TYPE_BOOL: 00376 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data); 00377 return; 00378 case AMF_DATA_TYPE_STRING: 00379 case AMF_DATA_TYPE_LONG_STRING: 00380 if (data[-1] == AMF_DATA_TYPE_STRING) { 00381 size = bytestream_get_be16(&data); 00382 } else { 00383 size = bytestream_get_be32(&data); 00384 } 00385 size = FFMIN(size, 1023); 00386 memcpy(buf, data, size); 00387 buf[size] = 0; 00388 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf); 00389 return; 00390 case AMF_DATA_TYPE_NULL: 00391 av_log(ctx, AV_LOG_DEBUG, " NULL\n"); 00392 return; 00393 case AMF_DATA_TYPE_ARRAY: 00394 data += 4; 00395 case AMF_DATA_TYPE_OBJECT: 00396 av_log(ctx, AV_LOG_DEBUG, " {\n"); 00397 for (;;) { 00398 int size = bytestream_get_be16(&data); 00399 int t; 00400 memcpy(buf, data, size); 00401 buf[size] = 0; 00402 if (!size) { 00403 av_log(ctx, AV_LOG_DEBUG, " }\n"); 00404 data++; 00405 break; 00406 } 00407 if (data + size >= data_end || data + size < data) 00408 return; 00409 data += size; 00410 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf); 00411 ff_amf_tag_contents(ctx, data, data_end); 00412 t = ff_amf_tag_size(data, data_end); 00413 if (t < 0 || data + t >= data_end) 00414 return; 00415 data += t; 00416 } 00417 return; 00418 case AMF_DATA_TYPE_OBJECT_END: 00419 av_log(ctx, AV_LOG_DEBUG, " }\n"); 00420 return; 00421 default: 00422 return; 00423 } 00424 } 00425 00426 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p) 00427 { 00428 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n", 00429 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size); 00430 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) { 00431 uint8_t *src = p->data, *src_end = p->data + p->data_size; 00432 while (src < src_end) { 00433 int sz; 00434 ff_amf_tag_contents(ctx, src, src_end); 00435 sz = ff_amf_tag_size(src, src_end); 00436 if (sz < 0) 00437 break; 00438 src += sz; 00439 } 00440 } else if (p->type == RTMP_PT_SERVER_BW){ 00441 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data)); 00442 } else if (p->type == RTMP_PT_CLIENT_BW){ 00443 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data)); 00444 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) { 00445 int i; 00446 for (i = 0; i < p->data_size; i++) 00447 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]); 00448 av_log(ctx, AV_LOG_DEBUG, "\n"); 00449 } 00450 }