Libav
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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 "avformat.h" 00025 00026 #include "rtmppkt.h" 00027 #include "flv.h" 00028 00029 void ff_amf_write_bool(uint8_t **dst, int val) 00030 { 00031 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL); 00032 bytestream_put_byte(dst, val); 00033 } 00034 00035 void ff_amf_write_number(uint8_t **dst, double val) 00036 { 00037 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER); 00038 bytestream_put_be64(dst, av_dbl2int(val)); 00039 } 00040 00041 void ff_amf_write_string(uint8_t **dst, const char *str) 00042 { 00043 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING); 00044 bytestream_put_be16(dst, strlen(str)); 00045 bytestream_put_buffer(dst, str, strlen(str)); 00046 } 00047 00048 void ff_amf_write_null(uint8_t **dst) 00049 { 00050 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL); 00051 } 00052 00053 void ff_amf_write_object_start(uint8_t **dst) 00054 { 00055 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT); 00056 } 00057 00058 void ff_amf_write_field_name(uint8_t **dst, const char *str) 00059 { 00060 bytestream_put_be16(dst, strlen(str)); 00061 bytestream_put_buffer(dst, str, strlen(str)); 00062 } 00063 00064 void ff_amf_write_object_end(uint8_t **dst) 00065 { 00066 /* first two bytes are field name length = 0, 00067 * AMF object should end with it and end marker 00068 */ 00069 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END); 00070 } 00071 00072 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p, 00073 int chunk_size, RTMPPacket *prev_pkt) 00074 { 00075 uint8_t hdr, t, buf[16]; 00076 int channel_id, timestamp, data_size, offset = 0; 00077 uint32_t extra = 0; 00078 enum RTMPPacketType type; 00079 int size = 0; 00080 00081 if (url_read(h, &hdr, 1) != 1) 00082 return AVERROR(EIO); 00083 size++; 00084 channel_id = hdr & 0x3F; 00085 00086 if (channel_id < 2) { //special case for channel number >= 64 00087 buf[1] = 0; 00088 if (url_read_complete(h, buf, channel_id + 1) != channel_id + 1) 00089 return AVERROR(EIO); 00090 size += channel_id + 1; 00091 channel_id = AV_RL16(buf) + 64; 00092 } 00093 data_size = prev_pkt[channel_id].data_size; 00094 type = prev_pkt[channel_id].type; 00095 extra = prev_pkt[channel_id].extra; 00096 00097 hdr >>= 6; 00098 if (hdr == RTMP_PS_ONEBYTE) { 00099 timestamp = prev_pkt[channel_id].ts_delta; 00100 } else { 00101 if (url_read_complete(h, buf, 3) != 3) 00102 return AVERROR(EIO); 00103 size += 3; 00104 timestamp = AV_RB24(buf); 00105 if (hdr != RTMP_PS_FOURBYTES) { 00106 if (url_read_complete(h, buf, 3) != 3) 00107 return AVERROR(EIO); 00108 size += 3; 00109 data_size = AV_RB24(buf); 00110 if (url_read_complete(h, buf, 1) != 1) 00111 return AVERROR(EIO); 00112 size++; 00113 type = buf[0]; 00114 if (hdr == RTMP_PS_TWELVEBYTES) { 00115 if (url_read_complete(h, buf, 4) != 4) 00116 return AVERROR(EIO); 00117 size += 4; 00118 extra = AV_RL32(buf); 00119 } 00120 } 00121 if (timestamp == 0xFFFFFF) { 00122 if (url_read_complete(h, buf, 4) != 4) 00123 return AVERROR(EIO); 00124 timestamp = AV_RB32(buf); 00125 } 00126 } 00127 if (hdr != RTMP_PS_TWELVEBYTES) 00128 timestamp += prev_pkt[channel_id].timestamp; 00129 00130 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size)) 00131 return -1; 00132 p->extra = extra; 00133 // save history 00134 prev_pkt[channel_id].channel_id = channel_id; 00135 prev_pkt[channel_id].type = type; 00136 prev_pkt[channel_id].data_size = data_size; 00137 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp; 00138 prev_pkt[channel_id].timestamp = timestamp; 00139 prev_pkt[channel_id].extra = extra; 00140 while (data_size > 0) { 00141 int toread = FFMIN(data_size, chunk_size); 00142 if (url_read_complete(h, p->data + offset, toread) != toread) { 00143 ff_rtmp_packet_destroy(p); 00144 return AVERROR(EIO); 00145 } 00146 data_size -= chunk_size; 00147 offset += chunk_size; 00148 size += chunk_size; 00149 if (data_size > 0) { 00150 url_read_complete(h, &t, 1); //marker 00151 size++; 00152 if (t != (0xC0 + channel_id)) 00153 return -1; 00154 } 00155 } 00156 return size; 00157 } 00158 00159 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt, 00160 int chunk_size, RTMPPacket *prev_pkt) 00161 { 00162 uint8_t pkt_hdr[16], *p = pkt_hdr; 00163 int mode = RTMP_PS_TWELVEBYTES; 00164 int off = 0; 00165 int size = 0; 00166 00167 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp; 00168 00169 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr. 00170 if (prev_pkt[pkt->channel_id].channel_id && 00171 pkt->extra == prev_pkt[pkt->channel_id].extra) { 00172 if (pkt->type == prev_pkt[pkt->channel_id].type && 00173 pkt->data_size == prev_pkt[pkt->channel_id].data_size) { 00174 mode = RTMP_PS_FOURBYTES; 00175 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta) 00176 mode = RTMP_PS_ONEBYTE; 00177 } else { 00178 mode = RTMP_PS_EIGHTBYTES; 00179 } 00180 } 00181 00182 if (pkt->channel_id < 64) { 00183 bytestream_put_byte(&p, pkt->channel_id | (mode << 6)); 00184 } else if (pkt->channel_id < 64 + 256) { 00185 bytestream_put_byte(&p, 0 | (mode << 6)); 00186 bytestream_put_byte(&p, pkt->channel_id - 64); 00187 } else { 00188 bytestream_put_byte(&p, 1 | (mode << 6)); 00189 bytestream_put_le16(&p, pkt->channel_id - 64); 00190 } 00191 if (mode != RTMP_PS_ONEBYTE) { 00192 uint32_t timestamp = pkt->timestamp; 00193 if (mode != RTMP_PS_TWELVEBYTES) 00194 timestamp = pkt->ts_delta; 00195 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp); 00196 if (mode != RTMP_PS_FOURBYTES) { 00197 bytestream_put_be24(&p, pkt->data_size); 00198 bytestream_put_byte(&p, pkt->type); 00199 if (mode == RTMP_PS_TWELVEBYTES) 00200 bytestream_put_le32(&p, pkt->extra); 00201 } 00202 if (timestamp >= 0xFFFFFF) 00203 bytestream_put_be32(&p, timestamp); 00204 } 00205 // save history 00206 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id; 00207 prev_pkt[pkt->channel_id].type = pkt->type; 00208 prev_pkt[pkt->channel_id].data_size = pkt->data_size; 00209 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp; 00210 if (mode != RTMP_PS_TWELVEBYTES) { 00211 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta; 00212 } else { 00213 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp; 00214 } 00215 prev_pkt[pkt->channel_id].extra = pkt->extra; 00216 00217 url_write(h, pkt_hdr, p-pkt_hdr); 00218 size = p - pkt_hdr + pkt->data_size; 00219 while (off < pkt->data_size) { 00220 int towrite = FFMIN(chunk_size, pkt->data_size - off); 00221 url_write(h, pkt->data + off, towrite); 00222 off += towrite; 00223 if (off < pkt->data_size) { 00224 uint8_t marker = 0xC0 | pkt->channel_id; 00225 url_write(h, &marker, 1); 00226 size++; 00227 } 00228 } 00229 return size; 00230 } 00231 00232 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type, 00233 int timestamp, int size) 00234 { 00235 pkt->data = av_malloc(size); 00236 if (!pkt->data) 00237 return AVERROR(ENOMEM); 00238 pkt->data_size = size; 00239 pkt->channel_id = channel_id; 00240 pkt->type = type; 00241 pkt->timestamp = timestamp; 00242 pkt->extra = 0; 00243 pkt->ts_delta = 0; 00244 00245 return 0; 00246 } 00247 00248 void ff_rtmp_packet_destroy(RTMPPacket *pkt) 00249 { 00250 if (!pkt) 00251 return; 00252 av_freep(&pkt->data); 00253 pkt->data_size = 0; 00254 } 00255 00256 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end) 00257 { 00258 const uint8_t *base = data; 00259 00260 if (data >= data_end) 00261 return -1; 00262 switch (*data++) { 00263 case AMF_DATA_TYPE_NUMBER: return 9; 00264 case AMF_DATA_TYPE_BOOL: return 2; 00265 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data); 00266 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data); 00267 case AMF_DATA_TYPE_NULL: return 1; 00268 case AMF_DATA_TYPE_ARRAY: 00269 data += 4; 00270 case AMF_DATA_TYPE_OBJECT: 00271 for (;;) { 00272 int size = bytestream_get_be16(&data); 00273 int t; 00274 if (!size) { 00275 data++; 00276 break; 00277 } 00278 if (data + size >= data_end || data + size < data) 00279 return -1; 00280 data += size; 00281 t = ff_amf_tag_size(data, data_end); 00282 if (t < 0 || data + t >= data_end) 00283 return -1; 00284 data += t; 00285 } 00286 return data - base; 00287 case AMF_DATA_TYPE_OBJECT_END: return 1; 00288 default: return -1; 00289 } 00290 } 00291 00292 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end, 00293 const uint8_t *name, uint8_t *dst, int dst_size) 00294 { 00295 int namelen = strlen(name); 00296 int len; 00297 00298 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) { 00299 len = ff_amf_tag_size(data, data_end); 00300 if (len < 0) 00301 len = data_end - data; 00302 data += len; 00303 } 00304 if (data_end - data < 3) 00305 return -1; 00306 data++; 00307 for (;;) { 00308 int size = bytestream_get_be16(&data); 00309 if (!size) 00310 break; 00311 if (data + size >= data_end || data + size < data) 00312 return -1; 00313 data += size; 00314 if (size == namelen && !memcmp(data-size, name, namelen)) { 00315 switch (*data++) { 00316 case AMF_DATA_TYPE_NUMBER: 00317 snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data))); 00318 break; 00319 case AMF_DATA_TYPE_BOOL: 00320 snprintf(dst, dst_size, "%s", *data ? "true" : "false"); 00321 break; 00322 case AMF_DATA_TYPE_STRING: 00323 len = bytestream_get_be16(&data); 00324 av_strlcpy(dst, data, FFMIN(len+1, dst_size)); 00325 break; 00326 default: 00327 return -1; 00328 } 00329 return 0; 00330 } 00331 len = ff_amf_tag_size(data, data_end); 00332 if (len < 0 || data + len >= data_end || data + len < data) 00333 return -1; 00334 data += len; 00335 } 00336 return -1; 00337 } 00338 00339 static const char* rtmp_packet_type(int type) 00340 { 00341 switch (type) { 00342 case RTMP_PT_CHUNK_SIZE: return "chunk size"; 00343 case RTMP_PT_BYTES_READ: return "bytes read"; 00344 case RTMP_PT_PING: return "ping"; 00345 case RTMP_PT_SERVER_BW: return "server bandwidth"; 00346 case RTMP_PT_CLIENT_BW: return "client bandwidth"; 00347 case RTMP_PT_AUDIO: return "audio packet"; 00348 case RTMP_PT_VIDEO: return "video packet"; 00349 case RTMP_PT_FLEX_STREAM: return "Flex shared stream"; 00350 case RTMP_PT_FLEX_OBJECT: return "Flex shared object"; 00351 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message"; 00352 case RTMP_PT_NOTIFY: return "notification"; 00353 case RTMP_PT_SHARED_OBJ: return "shared object"; 00354 case RTMP_PT_INVOKE: return "invoke"; 00355 case RTMP_PT_METADATA: return "metadata"; 00356 default: return "unknown"; 00357 } 00358 } 00359 00360 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end) 00361 { 00362 int size; 00363 char buf[1024]; 00364 00365 if (data >= data_end) 00366 return; 00367 switch (*data++) { 00368 case AMF_DATA_TYPE_NUMBER: 00369 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2dbl(AV_RB64(data))); 00370 return; 00371 case AMF_DATA_TYPE_BOOL: 00372 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data); 00373 return; 00374 case AMF_DATA_TYPE_STRING: 00375 case AMF_DATA_TYPE_LONG_STRING: 00376 if (data[-1] == AMF_DATA_TYPE_STRING) { 00377 size = bytestream_get_be16(&data); 00378 } else { 00379 size = bytestream_get_be32(&data); 00380 } 00381 size = FFMIN(size, 1023); 00382 memcpy(buf, data, size); 00383 buf[size] = 0; 00384 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf); 00385 return; 00386 case AMF_DATA_TYPE_NULL: 00387 av_log(ctx, AV_LOG_DEBUG, " NULL\n"); 00388 return; 00389 case AMF_DATA_TYPE_ARRAY: 00390 data += 4; 00391 case AMF_DATA_TYPE_OBJECT: 00392 av_log(ctx, AV_LOG_DEBUG, " {\n"); 00393 for (;;) { 00394 int size = bytestream_get_be16(&data); 00395 int t; 00396 memcpy(buf, data, size); 00397 buf[size] = 0; 00398 if (!size) { 00399 av_log(ctx, AV_LOG_DEBUG, " }\n"); 00400 data++; 00401 break; 00402 } 00403 if (data + size >= data_end || data + size < data) 00404 return; 00405 data += size; 00406 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf); 00407 ff_amf_tag_contents(ctx, data, data_end); 00408 t = ff_amf_tag_size(data, data_end); 00409 if (t < 0 || data + t >= data_end) 00410 return; 00411 data += t; 00412 } 00413 return; 00414 case AMF_DATA_TYPE_OBJECT_END: 00415 av_log(ctx, AV_LOG_DEBUG, " }\n"); 00416 return; 00417 default: 00418 return; 00419 } 00420 } 00421 00422 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p) 00423 { 00424 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n", 00425 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size); 00426 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) { 00427 uint8_t *src = p->data, *src_end = p->data + p->data_size; 00428 while (src < src_end) { 00429 int sz; 00430 ff_amf_tag_contents(ctx, src, src_end); 00431 sz = ff_amf_tag_size(src, src_end); 00432 if (sz < 0) 00433 break; 00434 src += sz; 00435 } 00436 } else if (p->type == RTMP_PT_SERVER_BW){ 00437 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data)); 00438 } else if (p->type == RTMP_PT_CLIENT_BW){ 00439 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data)); 00440 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) { 00441 int i; 00442 for (i = 0; i < p->data_size; i++) 00443 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]); 00444 av_log(ctx, AV_LOG_DEBUG, "\n"); 00445 } 00446 }