/* * RTMP network protocol * Copyright (c) 2009 Kostya Shishkov * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * RTMP protocol */ #include "libavcodec/bytestream.h" #include "libavutil/avstring.h" #include "libavutil/intfloat.h" #include "libavutil/lfg.h" #include "libavutil/opt.h" #include "libavutil/sha.h" #include "avformat.h" #include "internal.h" #include "network.h" #include "flv.h" #include "rtmp.h" #include "rtmppkt.h" #include "url.h" //#define DEBUG #define APP_MAX_LENGTH 128 #define PLAYPATH_MAX_LENGTH 256 #define TCURL_MAX_LENGTH 512 #define FLASHVER_MAX_LENGTH 64 /** RTMP protocol handler state */ typedef enum { STATE_START, ///< client has not done anything yet STATE_HANDSHAKED, ///< client has performed handshake STATE_RELEASING, ///< client releasing stream before publish it (for output) STATE_FCPUBLISH, ///< client FCPublishing stream (for output) STATE_CONNECTING, ///< client connected to server successfully STATE_READY, ///< client has sent all needed commands and waits for server reply STATE_PLAYING, ///< client has started receiving multimedia data from server STATE_PUBLISHING, ///< client has started sending multimedia data to server (for output) STATE_STOPPED, ///< the broadcast has been stopped } ClientState; /** protocol handler context */ typedef struct RTMPContext { const AVClass *class; URLContext* stream; ///< TCP stream used in interactions with RTMP server RTMPPacket prev_pkt[2][RTMP_CHANNELS]; ///< packet history used when reading and sending packets int chunk_size; ///< size of the chunks RTMP packets are divided into int is_input; ///< input/output flag char *playpath; ///< stream identifier to play (with possible "mp4:" prefix) int live; ///< 0: recorded, -1: live, -2: both char *app; ///< name of application char *conn; ///< append arbitrary AMF data to the Connect message ClientState state; ///< current state int main_channel_id; ///< an additional channel ID which is used for some invocations uint8_t* flv_data; ///< buffer with data for demuxer int flv_size; ///< current buffer size int flv_off; ///< number of bytes read from current buffer int flv_nb_packets; ///< number of flv packets published RTMPPacket out_pkt; ///< rtmp packet, created from flv a/v or metadata (for output) uint32_t client_report_size; ///< number of bytes after which client should report to server uint32_t bytes_read; ///< number of bytes read from server uint32_t last_bytes_read; ///< number of bytes read last reported to server int skip_bytes; ///< number of bytes to skip from the input FLV stream in the next write call uint8_t flv_header[11]; ///< partial incoming flv packet header int flv_header_bytes; ///< number of initialized bytes in flv_header int nb_invokes; ///< keeps track of invoke messages int create_stream_invoke; ///< invoke id for the create stream command char* tcurl; ///< url of the target stream char* flashver; ///< version of the flash plugin char* swfurl; ///< url of the swf player int server_bw; ///< server bandwidth int client_buffer_time; ///< client buffer time in ms int flush_interval; ///< number of packets flushed in the same request (RTMPT only) } RTMPContext; #define PLAYER_KEY_OPEN_PART_LEN 30 ///< length of partial key used for first client digest signing /** Client key used for digest signing */ static const uint8_t rtmp_player_key[] = { 'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ', 'F', 'l', 'a', 's', 'h', ' ', 'P', 'l', 'a', 'y', 'e', 'r', ' ', '0', '0', '1', 0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02, 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8, 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE }; #define SERVER_KEY_OPEN_PART_LEN 36 ///< length of partial key used for first server digest signing /** Key used for RTMP server digest signing */ static const uint8_t rtmp_server_key[] = { 'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ', 'F', 'l', 'a', 's', 'h', ' ', 'M', 'e', 'd', 'i', 'a', ' ', 'S', 'e', 'r', 'v', 'e', 'r', ' ', '0', '0', '1', 0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02, 0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8, 0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE }; static int rtmp_write_amf_data(URLContext *s, char *param, uint8_t **p) { char *field, *value; char type; /* The type must be B for Boolean, N for number, S for string, O for * object, or Z for null. For Booleans the data must be either 0 or 1 for * FALSE or TRUE, respectively. Likewise for Objects the data must be * 0 or 1 to end or begin an object, respectively. Data items in subobjects * may be named, by prefixing the type with 'N' and specifying the name * before the value (ie. NB:myFlag:1). This option may be used multiple times * to construct arbitrary AMF sequences. */ if (param[0] && param[1] == ':') { type = param[0]; value = param + 2; } else if (param[0] == 'N' && param[1] && param[2] == ':') { type = param[1]; field = param + 3; value = strchr(field, ':'); if (!value) goto fail; *value = '\0'; value++; if (!field || !value) goto fail; ff_amf_write_field_name(p, field); } else { goto fail; } switch (type) { case 'B': ff_amf_write_bool(p, value[0] != '0'); break; case 'S': ff_amf_write_string(p, value); break; case 'N': ff_amf_write_number(p, strtod(value, NULL)); break; case 'Z': ff_amf_write_null(p); break; case 'O': if (value[0] != '0') ff_amf_write_object_start(p); else ff_amf_write_object_end(p); break; default: goto fail; break; } return 0; fail: av_log(s, AV_LOG_ERROR, "Invalid AMF parameter: %s\n", param); return AVERROR(EINVAL); } /** * Generate 'connect' call and send it to the server. */ static int gen_connect(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 4096)) < 0) return ret; p = pkt.data; ff_amf_write_string(&p, "connect"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_object_start(&p); ff_amf_write_field_name(&p, "app"); ff_amf_write_string(&p, rt->app); if (!rt->is_input) { ff_amf_write_field_name(&p, "type"); ff_amf_write_string(&p, "nonprivate"); } ff_amf_write_field_name(&p, "flashVer"); ff_amf_write_string(&p, rt->flashver); if (rt->swfurl) { ff_amf_write_field_name(&p, "swfUrl"); ff_amf_write_string(&p, rt->swfurl); } ff_amf_write_field_name(&p, "tcUrl"); ff_amf_write_string(&p, rt->tcurl); if (rt->is_input) { ff_amf_write_field_name(&p, "fpad"); ff_amf_write_bool(&p, 0); ff_amf_write_field_name(&p, "capabilities"); ff_amf_write_number(&p, 15.0); /* Tell the server we support all the audio codecs except * SUPPORT_SND_INTEL (0x0008) and SUPPORT_SND_UNUSED (0x0010) * which are unused in the RTMP protocol implementation. */ ff_amf_write_field_name(&p, "audioCodecs"); ff_amf_write_number(&p, 4071.0); ff_amf_write_field_name(&p, "videoCodecs"); ff_amf_write_number(&p, 252.0); ff_amf_write_field_name(&p, "videoFunction"); ff_amf_write_number(&p, 1.0); } ff_amf_write_object_end(&p); if (rt->conn) { char *param = rt->conn; // Write arbitrary AMF data to the Connect message. while (param != NULL) { char *sep; param += strspn(param, " "); if (!*param) break; sep = strchr(param, ' '); if (sep) *sep = '\0'; if ((ret = rtmp_write_amf_data(s, param, &p)) < 0) { // Invalid AMF parameter. ff_rtmp_packet_destroy(&pkt); return ret; } if (sep) param = sep + 1; else break; } } pkt.data_size = p - pkt.data; ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate 'releaseStream' call and send it to the server. It should make * the server release some channel for media streams. */ static int gen_release_stream(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 29 + strlen(rt->playpath))) < 0) return ret; av_log(s, AV_LOG_DEBUG, "Releasing stream...\n"); p = pkt.data; ff_amf_write_string(&p, "releaseStream"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); ff_amf_write_string(&p, rt->playpath); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate 'FCPublish' call and send it to the server. It should make * the server preapare for receiving media streams. */ static int gen_fcpublish_stream(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 25 + strlen(rt->playpath))) < 0) return ret; av_log(s, AV_LOG_DEBUG, "FCPublish stream...\n"); p = pkt.data; ff_amf_write_string(&p, "FCPublish"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); ff_amf_write_string(&p, rt->playpath); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate 'FCUnpublish' call and send it to the server. It should make * the server destroy stream. */ static int gen_fcunpublish_stream(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 27 + strlen(rt->playpath))) < 0) return ret; av_log(s, AV_LOG_DEBUG, "UnPublishing stream...\n"); p = pkt.data; ff_amf_write_string(&p, "FCUnpublish"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); ff_amf_write_string(&p, rt->playpath); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate 'createStream' call and send it to the server. It should make * the server allocate some channel for media streams. */ static int gen_create_stream(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; av_log(s, AV_LOG_DEBUG, "Creating stream...\n"); if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 25)) < 0) return ret; p = pkt.data; ff_amf_write_string(&p, "createStream"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); rt->create_stream_invoke = rt->nb_invokes; ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate 'deleteStream' call and send it to the server. It should make * the server remove some channel for media streams. */ static int gen_delete_stream(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; av_log(s, AV_LOG_DEBUG, "Deleting stream...\n"); if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 34)) < 0) return ret; p = pkt.data; ff_amf_write_string(&p, "deleteStream"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); ff_amf_write_number(&p, rt->main_channel_id); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate client buffer time and send it to the server. */ static int gen_buffer_time(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, 1, 10)) < 0) return ret; p = pkt.data; bytestream_put_be16(&p, 3); bytestream_put_be32(&p, rt->main_channel_id); bytestream_put_be32(&p, rt->client_buffer_time); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate 'play' call and send it to the server, then ping the server * to start actual playing. */ static int gen_play(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; av_log(s, AV_LOG_DEBUG, "Sending play command for '%s'\n", rt->playpath); if ((ret = ff_rtmp_packet_create(&pkt, RTMP_VIDEO_CHANNEL, RTMP_PT_INVOKE, 0, 29 + strlen(rt->playpath))) < 0) return ret; pkt.extra = rt->main_channel_id; p = pkt.data; ff_amf_write_string(&p, "play"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); ff_amf_write_string(&p, rt->playpath); ff_amf_write_number(&p, rt->live); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate 'publish' call and send it to the server. */ static int gen_publish(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; av_log(s, AV_LOG_DEBUG, "Sending publish command for '%s'\n", rt->playpath); if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SOURCE_CHANNEL, RTMP_PT_INVOKE, 0, 30 + strlen(rt->playpath))) < 0) return ret; pkt.extra = rt->main_channel_id; p = pkt.data; ff_amf_write_string(&p, "publish"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); ff_amf_write_string(&p, rt->playpath); ff_amf_write_string(&p, "live"); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate ping reply and send it to the server. */ static int gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, ppkt->timestamp + 1, 6)) < 0) return ret; p = pkt.data; bytestream_put_be16(&p, 7); bytestream_put_be32(&p, AV_RB32(ppkt->data+2)); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate server bandwidth message and send it to the server. */ static int gen_server_bw(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_SERVER_BW, 0, 4)) < 0) return ret; p = pkt.data; bytestream_put_be32(&p, rt->server_bw); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate check bandwidth message and send it to the server. */ static int gen_check_bw(URLContext *s, RTMPContext *rt) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 21)) < 0) return ret; p = pkt.data; ff_amf_write_string(&p, "_checkbw"); ff_amf_write_number(&p, ++rt->nb_invokes); ff_amf_write_null(&p); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } /** * Generate report on bytes read so far and send it to the server. */ static int gen_bytes_read(URLContext *s, RTMPContext *rt, uint32_t ts) { RTMPPacket pkt; uint8_t *p; int ret; if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_BYTES_READ, ts, 4)) < 0) return ret; p = pkt.data; bytestream_put_be32(&p, rt->bytes_read); ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]); ff_rtmp_packet_destroy(&pkt); return ret; } int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap, const uint8_t *key, int keylen, uint8_t *dst) { struct AVSHA *sha; uint8_t hmac_buf[64+32] = {0}; int i; sha = av_mallocz(av_sha_size); if (!sha) return AVERROR(ENOMEM); if (keylen < 64) { memcpy(hmac_buf, key, keylen); } else { av_sha_init(sha, 256); av_sha_update(sha,key, keylen); av_sha_final(sha, hmac_buf); } for (i = 0; i < 64; i++) hmac_buf[i] ^= HMAC_IPAD_VAL; av_sha_init(sha, 256); av_sha_update(sha, hmac_buf, 64); if (gap <= 0) { av_sha_update(sha, src, len); } else { //skip 32 bytes used for storing digest av_sha_update(sha, src, gap); av_sha_update(sha, src + gap + 32, len - gap - 32); } av_sha_final(sha, hmac_buf + 64); for (i = 0; i < 64; i++) hmac_buf[i] ^= HMAC_IPAD_VAL ^ HMAC_OPAD_VAL; //reuse XORed key for opad av_sha_init(sha, 256); av_sha_update(sha, hmac_buf, 64+32); av_sha_final(sha, dst); av_free(sha); return 0; } int ff_rtmp_calc_digest_pos(const uint8_t *buf, int off, int mod_val, int add_val) { int i, digest_pos = 0; for (i = 0; i < 4; i++) digest_pos += buf[i + off]; digest_pos = digest_pos % mod_val + add_val; return digest_pos; } /** * Put HMAC-SHA2 digest of packet data (except for the bytes where this digest * will be stored) into that packet. * * @param buf handshake data (1536 bytes) * @return offset to the digest inside input data */ static int rtmp_handshake_imprint_with_digest(uint8_t *buf) { int ret, digest_pos; digest_pos = ff_rtmp_calc_digest_pos(buf, 8, 728, 12); ret = ff_rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos, rtmp_player_key, PLAYER_KEY_OPEN_PART_LEN, buf + digest_pos); if (ret < 0) return ret; return digest_pos; } /** * Verify that the received server response has the expected digest value. * * @param buf handshake data received from the server (1536 bytes) * @param off position to search digest offset from * @return 0 if digest is valid, digest position otherwise */ static int rtmp_validate_digest(uint8_t *buf, int off) { uint8_t digest[32]; int ret, digest_pos; digest_pos = ff_rtmp_calc_digest_pos(buf, off, 728, off + 4); ret = ff_rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos, rtmp_server_key, SERVER_KEY_OPEN_PART_LEN, digest); if (ret < 0) return ret; if (!memcmp(digest, buf + digest_pos, 32)) return digest_pos; return 0; } /** * Perform handshake with the server by means of exchanging pseudorandom data * signed with HMAC-SHA2 digest. * * @return 0 if handshake succeeds, negative value otherwise */ static int rtmp_handshake(URLContext *s, RTMPContext *rt) { AVLFG rnd; uint8_t tosend [RTMP_HANDSHAKE_PACKET_SIZE+1] = { 3, // unencrypted data 0, 0, 0, 0, // client uptime RTMP_CLIENT_VER1, RTMP_CLIENT_VER2, RTMP_CLIENT_VER3, RTMP_CLIENT_VER4, }; uint8_t clientdata[RTMP_HANDSHAKE_PACKET_SIZE]; uint8_t serverdata[RTMP_HANDSHAKE_PACKET_SIZE+1]; int i; int server_pos, client_pos; uint8_t digest[32]; int ret; av_log(s, AV_LOG_DEBUG, "Handshaking...\n"); av_lfg_init(&rnd, 0xDEADC0DE); // generate handshake packet - 1536 bytes of pseudorandom data for (i = 9; i <= RTMP_HANDSHAKE_PACKET_SIZE; i++) tosend[i] = av_lfg_get(&rnd) >> 24; client_pos = rtmp_handshake_imprint_with_digest(tosend + 1); if (client_pos < 0) return client_pos; if ((ret = ffurl_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE + 1)) < 0) { av_log(s, AV_LOG_ERROR, "Cannot write RTMP handshake request\n"); return ret; } if ((ret = ffurl_read_complete(rt->stream, serverdata, RTMP_HANDSHAKE_PACKET_SIZE + 1)) < 0) { av_log(s, AV_LOG_ERROR, "Cannot read RTMP handshake response\n"); return ret; } if ((ret = ffurl_read_complete(rt->stream, clientdata, RTMP_HANDSHAKE_PACKET_SIZE)) < 0) { av_log(s, AV_LOG_ERROR, "Cannot read RTMP handshake response\n"); return ret; } av_log(s, AV_LOG_DEBUG, "Server version %d.%d.%d.%d\n", serverdata[5], serverdata[6], serverdata[7], serverdata[8]); if (rt->is_input && serverdata[5] >= 3) { server_pos = rtmp_validate_digest(serverdata + 1, 772); if (server_pos < 0) return server_pos; if (!server_pos) { server_pos = rtmp_validate_digest(serverdata + 1, 8); if (server_pos < 0) return server_pos; if (!server_pos) { av_log(s, AV_LOG_ERROR, "Server response validating failed\n"); return AVERROR(EIO); } } ret = ff_rtmp_calc_digest(tosend + 1 + client_pos, 32, 0, rtmp_server_key, sizeof(rtmp_server_key), digest); if (ret < 0) return ret; ret = ff_rtmp_calc_digest(clientdata, RTMP_HANDSHAKE_PACKET_SIZE - 32, 0, digest, 32, digest); if (ret < 0) return ret; if (memcmp(digest, clientdata + RTMP_HANDSHAKE_PACKET_SIZE - 32, 32)) { av_log(s, AV_LOG_ERROR, "Signature mismatch\n"); return AVERROR(EIO); } for (i = 0; i < RTMP_HANDSHAKE_PACKET_SIZE; i++) tosend[i] = av_lfg_get(&rnd) >> 24; ret = ff_rtmp_calc_digest(serverdata + 1 + server_pos, 32, 0, rtmp_player_key, sizeof(rtmp_player_key), digest); if (ret < 0) return ret; ret = ff_rtmp_calc_digest(tosend, RTMP_HANDSHAKE_PACKET_SIZE - 32, 0, digest, 32, tosend + RTMP_HANDSHAKE_PACKET_SIZE - 32); if (ret < 0) return ret; // write reply back to the server if ((ret = ffurl_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE)) < 0) return ret; } else { if ((ret = ffurl_write(rt->stream, serverdata + 1, RTMP_HANDSHAKE_PACKET_SIZE)) < 0) return ret; } return 0; } /** * Parse received packet and possibly perform some action depending on * the packet contents. * @return 0 for no errors, negative values for serious errors which prevent * further communications, positive values for uncritical errors */ static int rtmp_parse_result(URLContext *s, RTMPContext *rt, RTMPPacket *pkt) { int i, t; const uint8_t *data_end = pkt->data + pkt->data_size; int ret; #ifdef DEBUG ff_rtmp_packet_dump(s, pkt); #endif switch (pkt->type) { case RTMP_PT_CHUNK_SIZE: if (pkt->data_size != 4) { av_log(s, AV_LOG_ERROR, "Chunk size change packet is not 4 bytes long (%d)\n", pkt->data_size); return -1; } if (!rt->is_input) if ((ret = ff_rtmp_packet_write(rt->stream, pkt, rt->chunk_size, rt->prev_pkt[1])) < 0) return ret; rt->chunk_size = AV_RB32(pkt->data); if (rt->chunk_size <= 0) { av_log(s, AV_LOG_ERROR, "Incorrect chunk size %d\n", rt->chunk_size); return -1; } av_log(s, AV_LOG_DEBUG, "New chunk size = %d\n", rt->chunk_size); break; case RTMP_PT_PING: t = AV_RB16(pkt->data); if (t == 6) if ((ret = gen_pong(s, rt, pkt)) < 0) return ret; break; case RTMP_PT_CLIENT_BW: if (pkt->data_size < 4) { av_log(s, AV_LOG_ERROR, "Client bandwidth report packet is less than 4 bytes long (%d)\n", pkt->data_size); return -1; } av_log(s, AV_LOG_DEBUG, "Client bandwidth = %d\n", AV_RB32(pkt->data)); rt->client_report_size = AV_RB32(pkt->data) >> 1; break; case RTMP_PT_SERVER_BW: rt->server_bw = AV_RB32(pkt->data); if (rt->server_bw <= 0) { av_log(s, AV_LOG_ERROR, "Incorrect server bandwidth %d\n", rt->server_bw); return AVERROR(EINVAL); } av_log(s, AV_LOG_DEBUG, "Server bandwidth = %d\n", rt->server_bw); break; case RTMP_PT_INVOKE: //TODO: check for the messages sent for wrong state? if (!memcmp(pkt->data, "\002\000\006_error", 9)) { uint8_t tmpstr[256]; if (!ff_amf_get_field_value(pkt->data + 9, data_end, "description", tmpstr, sizeof(tmpstr))) av_log(s, AV_LOG_ERROR, "Server error: %s\n",tmpstr); return -1; } else if (!memcmp(pkt->data, "\002\000\007_result", 10)) { switch (rt->state) { case STATE_HANDSHAKED: if (!rt->is_input) { if ((ret = gen_release_stream(s, rt)) < 0) return ret; if ((ret = gen_fcpublish_stream(s, rt)) < 0) return ret; rt->state = STATE_RELEASING; } else { if ((ret = gen_server_bw(s, rt)) < 0) return ret; rt->state = STATE_CONNECTING; } if ((ret = gen_create_stream(s, rt)) < 0) return ret; break; case STATE_FCPUBLISH: rt->state = STATE_CONNECTING; break; case STATE_RELEASING: rt->state = STATE_FCPUBLISH; /* hack for Wowza Media Server, it does not send result for * releaseStream and FCPublish calls */ if (!pkt->data[10]) { int pkt_id = av_int2double(AV_RB64(pkt->data + 11)); if (pkt_id == rt->create_stream_invoke) rt->state = STATE_CONNECTING; } if (rt->state != STATE_CONNECTING) break; case STATE_CONNECTING: //extract a number from the result if (pkt->data[10] || pkt->data[19] != 5 || pkt->data[20]) { av_log(s, AV_LOG_WARNING, "Unexpected reply on connect()\n"); } else { rt->main_channel_id = av_int2double(AV_RB64(pkt->data + 21)); } if (rt->is_input) { if ((ret = gen_play(s, rt)) < 0) return ret; if ((ret = gen_buffer_time(s, rt)) < 0) return ret; } else { if ((ret = gen_publish(s, rt)) < 0) return ret; } rt->state = STATE_READY; break; } } else if (!memcmp(pkt->data, "\002\000\010onStatus", 11)) { const uint8_t* ptr = pkt->data + 11; uint8_t tmpstr[256]; for (i = 0; i < 2; i++) { t = ff_amf_tag_size(ptr, data_end); if (t < 0) return 1; ptr += t; } t = ff_amf_get_field_value(ptr, data_end, "level", tmpstr, sizeof(tmpstr)); if (!t && !strcmp(tmpstr, "error")) { if (!ff_amf_get_field_value(ptr, data_end, "description", tmpstr, sizeof(tmpstr))) av_log(s, AV_LOG_ERROR, "Server error: %s\n",tmpstr); return -1; } t = ff_amf_get_field_value(ptr, data_end, "code", tmpstr, sizeof(tmpstr)); if (!t && !strcmp(tmpstr, "NetStream.Play.Start")) rt->state = STATE_PLAYING; if (!t && !strcmp(tmpstr, "NetStream.Play.Stop")) rt->state = STATE_STOPPED; if (!t && !strcmp(tmpstr, "NetStream.Play.UnpublishNotify")) rt->state = STATE_STOPPED; if (!t && !strcmp(tmpstr, "NetStream.Publish.Start")) rt->state = STATE_PUBLISHING; } else if (!memcmp(pkt->data, "\002\000\010onBWDone", 11)) { if ((ret = gen_check_bw(s, rt)) < 0) return ret; } break; case RTMP_PT_VIDEO: case RTMP_PT_AUDIO: /* Audio and Video packets are parsed in get_packet() */ break; default: av_log(s, AV_LOG_VERBOSE, "Unknown packet type received 0x%02X\n", pkt->type); break; } return 0; } /** * Interact with the server by receiving and sending RTMP packets until * there is some significant data (media data or expected status notification). * * @param s reading context * @param for_header non-zero value tells function to work until it * gets notification from the server that playing has been started, * otherwise function will work until some media data is received (or * an error happens) * @return 0 for successful operation, negative value in case of error */ static int get_packet(URLContext *s, int for_header) { RTMPContext *rt = s->priv_data; int ret; uint8_t *p; const uint8_t *next; uint32_t data_size; uint32_t ts, cts, pts=0; if (rt->state == STATE_STOPPED) return AVERROR_EOF; for (;;) { RTMPPacket rpkt = { 0 }; if ((ret = ff_rtmp_packet_read(rt->stream, &rpkt, rt->chunk_size, rt->prev_pkt[0])) <= 0) { if (ret == 0) { return AVERROR(EAGAIN); } else { return AVERROR(EIO); } } rt->bytes_read += ret; if (rt->bytes_read > rt->last_bytes_read + rt->client_report_size) { av_log(s, AV_LOG_DEBUG, "Sending bytes read report\n"); if ((ret = gen_bytes_read(s, rt, rpkt.timestamp + 1)) < 0) return ret; rt->last_bytes_read = rt->bytes_read; } ret = rtmp_parse_result(s, rt, &rpkt); if (ret < 0) {//serious error in current packet ff_rtmp_packet_destroy(&rpkt); return ret; } if (rt->state == STATE_STOPPED) { ff_rtmp_packet_destroy(&rpkt); return AVERROR_EOF; } if (for_header && (rt->state == STATE_PLAYING || rt->state == STATE_PUBLISHING)) { ff_rtmp_packet_destroy(&rpkt); return 0; } if (!rpkt.data_size || !rt->is_input) { ff_rtmp_packet_destroy(&rpkt); continue; } if (rpkt.type == RTMP_PT_VIDEO || rpkt.type == RTMP_PT_AUDIO || (rpkt.type == RTMP_PT_NOTIFY && !memcmp("\002\000\012onMetaData", rpkt.data, 13))) { ts = rpkt.timestamp; // generate packet header and put data into buffer for FLV demuxer rt->flv_off = 0; rt->flv_size = rpkt.data_size + 15; rt->flv_data = p = av_realloc(rt->flv_data, rt->flv_size); bytestream_put_byte(&p, rpkt.type); bytestream_put_be24(&p, rpkt.data_size); bytestream_put_be24(&p, ts); bytestream_put_byte(&p, ts >> 24); bytestream_put_be24(&p, 0); bytestream_put_buffer(&p, rpkt.data, rpkt.data_size); bytestream_put_be32(&p, 0); ff_rtmp_packet_destroy(&rpkt); return 0; } else if (rpkt.type == RTMP_PT_METADATA) { // we got raw FLV data, make it available for FLV demuxer rt->flv_off = 0; rt->flv_size = rpkt.data_size; rt->flv_data = av_realloc(rt->flv_data, rt->flv_size); /* rewrite timestamps */ next = rpkt.data; ts = rpkt.timestamp; while (next - rpkt.data < rpkt.data_size - 11) { next++; data_size = bytestream_get_be24(&next); p=next; cts = bytestream_get_be24(&next); cts |= bytestream_get_byte(&next) << 24; if (pts==0) pts=cts; ts += cts - pts; pts = cts; bytestream_put_be24(&p, ts); bytestream_put_byte(&p, ts >> 24); next += data_size + 3 + 4; } memcpy(rt->flv_data, rpkt.data, rpkt.data_size); ff_rtmp_packet_destroy(&rpkt); return 0; } ff_rtmp_packet_destroy(&rpkt); } } static int rtmp_close(URLContext *h) { RTMPContext *rt = h->priv_data; int ret = 0; if (!rt->is_input) { rt->flv_data = NULL; if (rt->out_pkt.data_size) ff_rtmp_packet_destroy(&rt->out_pkt); if (rt->state > STATE_FCPUBLISH) ret = gen_fcunpublish_stream(h, rt); } if (rt->state > STATE_HANDSHAKED) ret = gen_delete_stream(h, rt); av_freep(&rt->flv_data); ffurl_close(rt->stream); return ret; } /** * Open RTMP connection and verify that the stream can be played. * * URL syntax: rtmp://server[:port][/app][/playpath] * where 'app' is first one or two directories in the path * (e.g. /ondemand/, /flash/live/, etc.) * and 'playpath' is a file name (the rest of the path, * may be prefixed with "mp4:") */ static int rtmp_open(URLContext *s, const char *uri, int flags) { RTMPContext *rt = s->priv_data; char proto[8], hostname[256], path[1024], *fname; char *old_app; uint8_t buf[2048]; int port; AVDictionary *opts = NULL; int ret; rt->is_input = !(flags & AVIO_FLAG_WRITE); av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port, path, sizeof(path), s->filename); if (!strcmp(proto, "rtmpt") || !strcmp(proto, "rtmpts")) { if (!strcmp(proto, "rtmpts")) av_dict_set(&opts, "ffrtmphttp_tls", "1", 1); /* open the http tunneling connection */ ff_url_join(buf, sizeof(buf), "ffrtmphttp", NULL, hostname, port, NULL); } else if (!strcmp(proto, "rtmps")) { /* open the tls connection */ if (port < 0) port = RTMPS_DEFAULT_PORT; ff_url_join(buf, sizeof(buf), "tls", NULL, hostname, port, NULL); } else { /* open the tcp connection */ if (port < 0) port = RTMP_DEFAULT_PORT; ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL); } if ((ret = ffurl_open(&rt->stream, buf, AVIO_FLAG_READ_WRITE, &s->interrupt_callback, &opts)) < 0) { av_log(s , AV_LOG_ERROR, "Cannot open connection %s\n", buf); goto fail; } rt->state = STATE_START; if ((ret = rtmp_handshake(s, rt)) < 0) goto fail; rt->chunk_size = 128; rt->state = STATE_HANDSHAKED; // Keep the application name when it has been defined by the user. old_app = rt->app; rt->app = av_malloc(APP_MAX_LENGTH); if (!rt->app) { ret = AVERROR(ENOMEM); goto fail; } //extract "app" part from path if (!strncmp(path, "/ondemand/", 10)) { fname = path + 10; memcpy(rt->app, "ondemand", 9); } else { char *next = *path ? path + 1 : path; char *p = strchr(next, '/'); if (!p) { fname = next; rt->app[0] = '\0'; } else { // make sure we do not mismatch a playpath for an application instance char *c = strchr(p + 1, ':'); fname = strchr(p + 1, '/'); if (!fname || (c && c < fname)) { fname = p + 1; av_strlcpy(rt->app, path + 1, p - path); } else { fname++; av_strlcpy(rt->app, path + 1, fname - path - 1); } } } if (old_app) { // The name of application has been defined by the user, override it. av_free(rt->app); rt->app = old_app; } if (!rt->playpath) { int len = strlen(fname); rt->playpath = av_malloc(PLAYPATH_MAX_LENGTH); if (!rt->playpath) { ret = AVERROR(ENOMEM); goto fail; } if (!strchr(fname, ':') && len >= 4 && (!strcmp(fname + len - 4, ".f4v") || !strcmp(fname + len - 4, ".mp4"))) { memcpy(rt->playpath, "mp4:", 5); } else if (len >= 4 && !strcmp(fname + len - 4, ".flv")) { fname[len - 4] = '\0'; } else { rt->playpath[0] = 0; } strncat(rt->playpath, fname, PLAYPATH_MAX_LENGTH - 5); } if (!rt->tcurl) { rt->tcurl = av_malloc(TCURL_MAX_LENGTH); if (!rt->tcurl) { ret = AVERROR(ENOMEM); goto fail; } ff_url_join(rt->tcurl, TCURL_MAX_LENGTH, proto, NULL, hostname, port, "/%s", rt->app); } if (!rt->flashver) { rt->flashver = av_malloc(FLASHVER_MAX_LENGTH); if (!rt->flashver) { ret = AVERROR(ENOMEM); goto fail; } if (rt->is_input) { snprintf(rt->flashver, FLASHVER_MAX_LENGTH, "%s %d,%d,%d,%d", RTMP_CLIENT_PLATFORM, RTMP_CLIENT_VER1, RTMP_CLIENT_VER2, RTMP_CLIENT_VER3, RTMP_CLIENT_VER4); } else { snprintf(rt->flashver, FLASHVER_MAX_LENGTH, "FMLE/3.0 (compatible; %s)", LIBAVFORMAT_IDENT); } } rt->client_report_size = 1048576; rt->bytes_read = 0; rt->last_bytes_read = 0; rt->server_bw = 2500000; av_log(s, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n", proto, path, rt->app, rt->playpath); if ((ret = gen_connect(s, rt)) < 0) goto fail; do { ret = get_packet(s, 1); } while (ret == EAGAIN); if (ret < 0) goto fail; if (rt->is_input) { // generate FLV header for demuxer rt->flv_size = 13; rt->flv_data = av_realloc(rt->flv_data, rt->flv_size); rt->flv_off = 0; memcpy(rt->flv_data, "FLV\1\5\0\0\0\011\0\0\0\0", rt->flv_size); } else { rt->flv_size = 0; rt->flv_data = NULL; rt->flv_off = 0; rt->skip_bytes = 13; } s->max_packet_size = rt->stream->max_packet_size; s->is_streamed = 1; return 0; fail: av_dict_free(&opts); rtmp_close(s); return ret; } static int rtmp_read(URLContext *s, uint8_t *buf, int size) { RTMPContext *rt = s->priv_data; int orig_size = size; int ret; while (size > 0) { int data_left = rt->flv_size - rt->flv_off; if (data_left >= size) { memcpy(buf, rt->flv_data + rt->flv_off, size); rt->flv_off += size; return orig_size; } if (data_left > 0) { memcpy(buf, rt->flv_data + rt->flv_off, data_left); buf += data_left; size -= data_left; rt->flv_off = rt->flv_size; return data_left; } if ((ret = get_packet(s, 0)) < 0) return ret; } return orig_size; } static int rtmp_write(URLContext *s, const uint8_t *buf, int size) { RTMPContext *rt = s->priv_data; int size_temp = size; int pktsize, pkttype; uint32_t ts; const uint8_t *buf_temp = buf; uint8_t c; int ret; do { if (rt->skip_bytes) { int skip = FFMIN(rt->skip_bytes, size_temp); buf_temp += skip; size_temp -= skip; rt->skip_bytes -= skip; continue; } if (rt->flv_header_bytes < 11) { const uint8_t *header = rt->flv_header; int copy = FFMIN(11 - rt->flv_header_bytes, size_temp); bytestream_get_buffer(&buf_temp, rt->flv_header + rt->flv_header_bytes, copy); rt->flv_header_bytes += copy; size_temp -= copy; if (rt->flv_header_bytes < 11) break; pkttype = bytestream_get_byte(&header); pktsize = bytestream_get_be24(&header); ts = bytestream_get_be24(&header); ts |= bytestream_get_byte(&header) << 24; bytestream_get_be24(&header); rt->flv_size = pktsize; //force 12bytes header if (((pkttype == RTMP_PT_VIDEO || pkttype == RTMP_PT_AUDIO) && ts == 0) || pkttype == RTMP_PT_NOTIFY) { if (pkttype == RTMP_PT_NOTIFY) pktsize += 16; rt->prev_pkt[1][RTMP_SOURCE_CHANNEL].channel_id = 0; } //this can be a big packet, it's better to send it right here if ((ret = ff_rtmp_packet_create(&rt->out_pkt, RTMP_SOURCE_CHANNEL, pkttype, ts, pktsize)) < 0) return ret; rt->out_pkt.extra = rt->main_channel_id; rt->flv_data = rt->out_pkt.data; if (pkttype == RTMP_PT_NOTIFY) ff_amf_write_string(&rt->flv_data, "@setDataFrame"); } if (rt->flv_size - rt->flv_off > size_temp) { bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, size_temp); rt->flv_off += size_temp; size_temp = 0; } else { bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, rt->flv_size - rt->flv_off); size_temp -= rt->flv_size - rt->flv_off; rt->flv_off += rt->flv_size - rt->flv_off; } if (rt->flv_off == rt->flv_size) { rt->skip_bytes = 4; if ((ret = ff_rtmp_packet_write(rt->stream, &rt->out_pkt, rt->chunk_size, rt->prev_pkt[1])) < 0) return ret; ff_rtmp_packet_destroy(&rt->out_pkt); rt->flv_size = 0; rt->flv_off = 0; rt->flv_header_bytes = 0; rt->flv_nb_packets++; } } while (buf_temp - buf < size); if (rt->flv_nb_packets < rt->flush_interval) return size; rt->flv_nb_packets = 0; /* set stream into nonblocking mode */ rt->stream->flags |= AVIO_FLAG_NONBLOCK; /* try to read one byte from the stream */ ret = ffurl_read(rt->stream, &c, 1); /* switch the stream back into blocking mode */ rt->stream->flags &= ~AVIO_FLAG_NONBLOCK; if (ret == AVERROR(EAGAIN)) { /* no incoming data to handle */ return size; } else if (ret < 0) { return ret; } else if (ret == 1) { RTMPPacket rpkt = { 0 }; if ((ret = ff_rtmp_packet_read_internal(rt->stream, &rpkt, rt->chunk_size, rt->prev_pkt[0], c)) <= 0) return ret; if ((ret = rtmp_parse_result(s, rt, &rpkt)) < 0) return ret; ff_rtmp_packet_destroy(&rpkt); } return size; } #define OFFSET(x) offsetof(RTMPContext, x) #define DEC AV_OPT_FLAG_DECODING_PARAM #define ENC AV_OPT_FLAG_ENCODING_PARAM static const AVOption rtmp_options[] = { {"rtmp_app", "Name of application to connect to on the RTMP server", OFFSET(app), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC}, {"rtmp_buffer", "Set buffer time in milliseconds. The default is 3000.", OFFSET(client_buffer_time), AV_OPT_TYPE_INT, {3000}, 0, INT_MAX, DEC|ENC}, {"rtmp_conn", "Append arbitrary AMF data to the Connect message", OFFSET(conn), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC}, {"rtmp_flashver", "Version of the Flash plugin used to run the SWF player.", OFFSET(flashver), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC}, {"rtmp_flush_interval", "Number of packets flushed in the same request (RTMPT only).", OFFSET(flush_interval), AV_OPT_TYPE_INT, {10}, 0, INT_MAX, ENC}, {"rtmp_live", "Specify that the media is a live stream.", OFFSET(live), AV_OPT_TYPE_INT, {-2}, INT_MIN, INT_MAX, DEC, "rtmp_live"}, {"any", "both", 0, AV_OPT_TYPE_CONST, {-2}, 0, 0, DEC, "rtmp_live"}, {"live", "live stream", 0, AV_OPT_TYPE_CONST, {-1}, 0, 0, DEC, "rtmp_live"}, {"recorded", "recorded stream", 0, AV_OPT_TYPE_CONST, {0}, 0, 0, DEC, "rtmp_live"}, {"rtmp_playpath", "Stream identifier to play or to publish", OFFSET(playpath), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC}, {"rtmp_swfurl", "URL of the SWF player. By default no value will be sent", OFFSET(swfurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC}, {"rtmp_tcurl", "URL of the target stream. Defaults to rtmp://host[:port]/app.", OFFSET(tcurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC}, { NULL }, }; static const AVClass rtmp_class = { .class_name = "rtmp", .item_name = av_default_item_name, .option = rtmp_options, .version = LIBAVUTIL_VERSION_INT, }; URLProtocol ff_rtmp_protocol = { .name = "rtmp", .url_open = rtmp_open, .url_read = rtmp_read, .url_write = rtmp_write, .url_close = rtmp_close, .priv_data_size = sizeof(RTMPContext), .flags = URL_PROTOCOL_FLAG_NETWORK, .priv_data_class= &rtmp_class, }; static const AVClass rtmps_class = { .class_name = "rtmps", .item_name = av_default_item_name, .option = rtmp_options, .version = LIBAVUTIL_VERSION_INT, }; URLProtocol ff_rtmps_protocol = { .name = "rtmps", .url_open = rtmp_open, .url_read = rtmp_read, .url_write = rtmp_write, .url_close = rtmp_close, .priv_data_size = sizeof(RTMPContext), .flags = URL_PROTOCOL_FLAG_NETWORK, .priv_data_class = &rtmps_class, }; static const AVClass rtmpt_class = { .class_name = "rtmpt", .item_name = av_default_item_name, .option = rtmp_options, .version = LIBAVUTIL_VERSION_INT, }; URLProtocol ff_rtmpt_protocol = { .name = "rtmpt", .url_open = rtmp_open, .url_read = rtmp_read, .url_write = rtmp_write, .url_close = rtmp_close, .priv_data_size = sizeof(RTMPContext), .flags = URL_PROTOCOL_FLAG_NETWORK, .priv_data_class = &rtmpt_class, }; static const AVClass rtmpts_class = { .class_name = "rtmpts", .item_name = av_default_item_name, .option = rtmp_options, .version = LIBAVUTIL_VERSION_INT, }; URLProtocol ff_rtmpts_protocol = { .name = "rtmpts", .url_open = rtmp_open, .url_read = rtmp_read, .url_write = rtmp_write, .url_close = rtmp_close, .priv_data_size = sizeof(RTMPContext), .flags = URL_PROTOCOL_FLAG_NETWORK, .priv_data_class = &rtmpts_class, };