Libav 0.7.1
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00001 /* 00002 * RTMP input format 00003 * Copyright (c) 2009 Kostya Shishkov 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 #include "url.h" 00029 00030 void ff_amf_write_bool(uint8_t **dst, int val) 00031 { 00032 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL); 00033 bytestream_put_byte(dst, val); 00034 } 00035 00036 void ff_amf_write_number(uint8_t **dst, double val) 00037 { 00038 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER); 00039 bytestream_put_be64(dst, av_dbl2int(val)); 00040 } 00041 00042 void ff_amf_write_string(uint8_t **dst, const char *str) 00043 { 00044 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING); 00045 bytestream_put_be16(dst, strlen(str)); 00046 bytestream_put_buffer(dst, str, strlen(str)); 00047 } 00048 00049 void ff_amf_write_null(uint8_t **dst) 00050 { 00051 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL); 00052 } 00053 00054 void ff_amf_write_object_start(uint8_t **dst) 00055 { 00056 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT); 00057 } 00058 00059 void ff_amf_write_field_name(uint8_t **dst, const char *str) 00060 { 00061 bytestream_put_be16(dst, strlen(str)); 00062 bytestream_put_buffer(dst, str, strlen(str)); 00063 } 00064 00065 void ff_amf_write_object_end(uint8_t **dst) 00066 { 00067 /* first two bytes are field name length = 0, 00068 * AMF object should end with it and end marker 00069 */ 00070 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END); 00071 } 00072 00073 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p, 00074 int chunk_size, RTMPPacket *prev_pkt) 00075 { 00076 uint8_t hdr, t, buf[16]; 00077 int channel_id, timestamp, data_size, offset = 0; 00078 uint32_t extra = 0; 00079 enum RTMPPacketType type; 00080 int size = 0; 00081 00082 if (ffurl_read(h, &hdr, 1) != 1) 00083 return AVERROR(EIO); 00084 size++; 00085 channel_id = hdr & 0x3F; 00086 00087 if (channel_id < 2) { //special case for channel number >= 64 00088 buf[1] = 0; 00089 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1) 00090 return AVERROR(EIO); 00091 size += channel_id + 1; 00092 channel_id = AV_RL16(buf) + 64; 00093 } 00094 data_size = prev_pkt[channel_id].data_size; 00095 type = prev_pkt[channel_id].type; 00096 extra = prev_pkt[channel_id].extra; 00097 00098 hdr >>= 6; 00099 if (hdr == RTMP_PS_ONEBYTE) { 00100 timestamp = prev_pkt[channel_id].ts_delta; 00101 } else { 00102 if (ffurl_read_complete(h, buf, 3) != 3) 00103 return AVERROR(EIO); 00104 size += 3; 00105 timestamp = AV_RB24(buf); 00106 if (hdr != RTMP_PS_FOURBYTES) { 00107 if (ffurl_read_complete(h, buf, 3) != 3) 00108 return AVERROR(EIO); 00109 size += 3; 00110 data_size = AV_RB24(buf); 00111 if (ffurl_read_complete(h, buf, 1) != 1) 00112 return AVERROR(EIO); 00113 size++; 00114 type = buf[0]; 00115 if (hdr == RTMP_PS_TWELVEBYTES) { 00116 if (ffurl_read_complete(h, buf, 4) != 4) 00117 return AVERROR(EIO); 00118 size += 4; 00119 extra = AV_RL32(buf); 00120 } 00121 } 00122 if (timestamp == 0xFFFFFF) { 00123 if (ffurl_read_complete(h, buf, 4) != 4) 00124 return AVERROR(EIO); 00125 timestamp = AV_RB32(buf); 00126 } 00127 } 00128 if (hdr != RTMP_PS_TWELVEBYTES) 00129 timestamp += prev_pkt[channel_id].timestamp; 00130 00131 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size)) 00132 return -1; 00133 p->extra = extra; 00134 // save history 00135 prev_pkt[channel_id].channel_id = channel_id; 00136 prev_pkt[channel_id].type = type; 00137 prev_pkt[channel_id].data_size = data_size; 00138 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp; 00139 prev_pkt[channel_id].timestamp = timestamp; 00140 prev_pkt[channel_id].extra = extra; 00141 while (data_size > 0) { 00142 int toread = FFMIN(data_size, chunk_size); 00143 if (ffurl_read_complete(h, p->data + offset, toread) != toread) { 00144 ff_rtmp_packet_destroy(p); 00145 return AVERROR(EIO); 00146 } 00147 data_size -= chunk_size; 00148 offset += chunk_size; 00149 size += chunk_size; 00150 if (data_size > 0) { 00151 ffurl_read_complete(h, &t, 1); //marker 00152 size++; 00153 if (t != (0xC0 + channel_id)) 00154 return -1; 00155 } 00156 } 00157 return size; 00158 } 00159 00160 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt, 00161 int chunk_size, RTMPPacket *prev_pkt) 00162 { 00163 uint8_t pkt_hdr[16], *p = pkt_hdr; 00164 int mode = RTMP_PS_TWELVEBYTES; 00165 int off = 0; 00166 int size = 0; 00167 00168 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp; 00169 00170 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr. 00171 if (prev_pkt[pkt->channel_id].channel_id && 00172 pkt->extra == prev_pkt[pkt->channel_id].extra) { 00173 if (pkt->type == prev_pkt[pkt->channel_id].type && 00174 pkt->data_size == prev_pkt[pkt->channel_id].data_size) { 00175 mode = RTMP_PS_FOURBYTES; 00176 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta) 00177 mode = RTMP_PS_ONEBYTE; 00178 } else { 00179 mode = RTMP_PS_EIGHTBYTES; 00180 } 00181 } 00182 00183 if (pkt->channel_id < 64) { 00184 bytestream_put_byte(&p, pkt->channel_id | (mode << 6)); 00185 } else if (pkt->channel_id < 64 + 256) { 00186 bytestream_put_byte(&p, 0 | (mode << 6)); 00187 bytestream_put_byte(&p, pkt->channel_id - 64); 00188 } else { 00189 bytestream_put_byte(&p, 1 | (mode << 6)); 00190 bytestream_put_le16(&p, pkt->channel_id - 64); 00191 } 00192 if (mode != RTMP_PS_ONEBYTE) { 00193 uint32_t timestamp = pkt->timestamp; 00194 if (mode != RTMP_PS_TWELVEBYTES) 00195 timestamp = pkt->ts_delta; 00196 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp); 00197 if (mode != RTMP_PS_FOURBYTES) { 00198 bytestream_put_be24(&p, pkt->data_size); 00199 bytestream_put_byte(&p, pkt->type); 00200 if (mode == RTMP_PS_TWELVEBYTES) 00201 bytestream_put_le32(&p, pkt->extra); 00202 } 00203 if (timestamp >= 0xFFFFFF) 00204 bytestream_put_be32(&p, timestamp); 00205 } 00206 // save history 00207 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id; 00208 prev_pkt[pkt->channel_id].type = pkt->type; 00209 prev_pkt[pkt->channel_id].data_size = pkt->data_size; 00210 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp; 00211 if (mode != RTMP_PS_TWELVEBYTES) { 00212 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta; 00213 } else { 00214 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp; 00215 } 00216 prev_pkt[pkt->channel_id].extra = pkt->extra; 00217 00218 ffurl_write(h, pkt_hdr, p-pkt_hdr); 00219 size = p - pkt_hdr + pkt->data_size; 00220 while (off < pkt->data_size) { 00221 int towrite = FFMIN(chunk_size, pkt->data_size - off); 00222 ffurl_write(h, pkt->data + off, towrite); 00223 off += towrite; 00224 if (off < pkt->data_size) { 00225 uint8_t marker = 0xC0 | pkt->channel_id; 00226 ffurl_write(h, &marker, 1); 00227 size++; 00228 } 00229 } 00230 return size; 00231 } 00232 00233 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type, 00234 int timestamp, int size) 00235 { 00236 if (size) { 00237 pkt->data = av_malloc(size); 00238 if (!pkt->data) 00239 return AVERROR(ENOMEM); 00240 } 00241 pkt->data_size = size; 00242 pkt->channel_id = channel_id; 00243 pkt->type = type; 00244 pkt->timestamp = timestamp; 00245 pkt->extra = 0; 00246 pkt->ts_delta = 0; 00247 00248 return 0; 00249 } 00250 00251 void ff_rtmp_packet_destroy(RTMPPacket *pkt) 00252 { 00253 if (!pkt) 00254 return; 00255 av_freep(&pkt->data); 00256 pkt->data_size = 0; 00257 } 00258 00259 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end) 00260 { 00261 const uint8_t *base = data; 00262 00263 if (data >= data_end) 00264 return -1; 00265 switch (*data++) { 00266 case AMF_DATA_TYPE_NUMBER: return 9; 00267 case AMF_DATA_TYPE_BOOL: return 2; 00268 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data); 00269 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data); 00270 case AMF_DATA_TYPE_NULL: return 1; 00271 case AMF_DATA_TYPE_ARRAY: 00272 data += 4; 00273 case AMF_DATA_TYPE_OBJECT: 00274 for (;;) { 00275 int size = bytestream_get_be16(&data); 00276 int t; 00277 if (!size) { 00278 data++; 00279 break; 00280 } 00281 if (data + size >= data_end || data + size < data) 00282 return -1; 00283 data += size; 00284 t = ff_amf_tag_size(data, data_end); 00285 if (t < 0 || data + t >= data_end) 00286 return -1; 00287 data += t; 00288 } 00289 return data - base; 00290 case AMF_DATA_TYPE_OBJECT_END: return 1; 00291 default: return -1; 00292 } 00293 } 00294 00295 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end, 00296 const uint8_t *name, uint8_t *dst, int dst_size) 00297 { 00298 int namelen = strlen(name); 00299 int len; 00300 00301 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) { 00302 len = ff_amf_tag_size(data, data_end); 00303 if (len < 0) 00304 len = data_end - data; 00305 data += len; 00306 } 00307 if (data_end - data < 3) 00308 return -1; 00309 data++; 00310 for (;;) { 00311 int size = bytestream_get_be16(&data); 00312 if (!size) 00313 break; 00314 if (data + size >= data_end || data + size < data) 00315 return -1; 00316 data += size; 00317 if (size == namelen && !memcmp(data-size, name, namelen)) { 00318 switch (*data++) { 00319 case AMF_DATA_TYPE_NUMBER: 00320 snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data))); 00321 break; 00322 case AMF_DATA_TYPE_BOOL: 00323 snprintf(dst, dst_size, "%s", *data ? "true" : "false"); 00324 break; 00325 case AMF_DATA_TYPE_STRING: 00326 len = bytestream_get_be16(&data); 00327 av_strlcpy(dst, data, FFMIN(len+1, dst_size)); 00328 break; 00329 default: 00330 return -1; 00331 } 00332 return 0; 00333 } 00334 len = ff_amf_tag_size(data, data_end); 00335 if (len < 0 || data + len >= data_end || data + len < data) 00336 return -1; 00337 data += len; 00338 } 00339 return -1; 00340 } 00341 00342 static const char* rtmp_packet_type(int type) 00343 { 00344 switch (type) { 00345 case RTMP_PT_CHUNK_SIZE: return "chunk size"; 00346 case RTMP_PT_BYTES_READ: return "bytes read"; 00347 case RTMP_PT_PING: return "ping"; 00348 case RTMP_PT_SERVER_BW: return "server bandwidth"; 00349 case RTMP_PT_CLIENT_BW: return "client bandwidth"; 00350 case RTMP_PT_AUDIO: return "audio packet"; 00351 case RTMP_PT_VIDEO: return "video packet"; 00352 case RTMP_PT_FLEX_STREAM: return "Flex shared stream"; 00353 case RTMP_PT_FLEX_OBJECT: return "Flex shared object"; 00354 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message"; 00355 case RTMP_PT_NOTIFY: return "notification"; 00356 case RTMP_PT_SHARED_OBJ: return "shared object"; 00357 case RTMP_PT_INVOKE: return "invoke"; 00358 case RTMP_PT_METADATA: return "metadata"; 00359 default: return "unknown"; 00360 } 00361 } 00362 00363 static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end) 00364 { 00365 int size; 00366 char buf[1024]; 00367 00368 if (data >= data_end) 00369 return; 00370 switch (*data++) { 00371 case AMF_DATA_TYPE_NUMBER: 00372 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2dbl(AV_RB64(data))); 00373 return; 00374 case AMF_DATA_TYPE_BOOL: 00375 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data); 00376 return; 00377 case AMF_DATA_TYPE_STRING: 00378 case AMF_DATA_TYPE_LONG_STRING: 00379 if (data[-1] == AMF_DATA_TYPE_STRING) { 00380 size = bytestream_get_be16(&data); 00381 } else { 00382 size = bytestream_get_be32(&data); 00383 } 00384 size = FFMIN(size, 1023); 00385 memcpy(buf, data, size); 00386 buf[size] = 0; 00387 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf); 00388 return; 00389 case AMF_DATA_TYPE_NULL: 00390 av_log(ctx, AV_LOG_DEBUG, " NULL\n"); 00391 return; 00392 case AMF_DATA_TYPE_ARRAY: 00393 data += 4; 00394 case AMF_DATA_TYPE_OBJECT: 00395 av_log(ctx, AV_LOG_DEBUG, " {\n"); 00396 for (;;) { 00397 int size = bytestream_get_be16(&data); 00398 int t; 00399 memcpy(buf, data, size); 00400 buf[size] = 0; 00401 if (!size) { 00402 av_log(ctx, AV_LOG_DEBUG, " }\n"); 00403 data++; 00404 break; 00405 } 00406 if (data + size >= data_end || data + size < data) 00407 return; 00408 data += size; 00409 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf); 00410 ff_amf_tag_contents(ctx, data, data_end); 00411 t = ff_amf_tag_size(data, data_end); 00412 if (t < 0 || data + t >= data_end) 00413 return; 00414 data += t; 00415 } 00416 return; 00417 case AMF_DATA_TYPE_OBJECT_END: 00418 av_log(ctx, AV_LOG_DEBUG, " }\n"); 00419 return; 00420 default: 00421 return; 00422 } 00423 } 00424 00425 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p) 00426 { 00427 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n", 00428 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size); 00429 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) { 00430 uint8_t *src = p->data, *src_end = p->data + p->data_size; 00431 while (src < src_end) { 00432 int sz; 00433 ff_amf_tag_contents(ctx, src, src_end); 00434 sz = ff_amf_tag_size(src, src_end); 00435 if (sz < 0) 00436 break; 00437 src += sz; 00438 } 00439 } else if (p->type == RTMP_PT_SERVER_BW){ 00440 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data)); 00441 } else if (p->type == RTMP_PT_CLIENT_BW){ 00442 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data)); 00443 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) { 00444 int i; 00445 for (i = 0; i < p->data_size; i++) 00446 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]); 00447 av_log(ctx, AV_LOG_DEBUG, "\n"); 00448 } 00449 }