/* * MMS protocol over TCP * Copyright (c) 2006,2007 Ryan Martell * Copyright (c) 2007 Björn Axelsson * Copyright (c) 2010 Zhentan Feng * * 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 */ /* References * MMS protocol specification: * [1]http://msdn.microsoft.com/en-us/library/cc234711(PROT.10).aspx * ASF specification. Revision 01.20.03. * [2]http://msdn.microsoft.com/en-us/library/bb643323.aspx */ #include "avformat.h" #include "mms.h" #include "internal.h" #include "avio_internal.h" #include "libavutil/intreadwrite.h" #include "libavcodec/bytestream.h" #include "network.h" #include "url.h" #define LOCAL_ADDRESS 0xc0a80081 // FIXME get and use correct local ip address. #define LOCAL_PORT 1037 // as above. /** Client to server packet types. */ typedef enum { CS_PKT_INITIAL = 0x01, CS_PKT_PROTOCOL_SELECT = 0x02, CS_PKT_MEDIA_FILE_REQUEST = 0x05, CS_PKT_START_FROM_PKT_ID = 0x07, CS_PKT_STREAM_PAUSE = 0x09, CS_PKT_STREAM_CLOSE = 0x0d, CS_PKT_MEDIA_HEADER_REQUEST = 0x15, CS_PKT_TIMING_DATA_REQUEST = 0x18, CS_PKT_USER_PASSWORD = 0x1a, CS_PKT_KEEPALIVE = 0x1b, CS_PKT_STREAM_ID_REQUEST = 0x33, } MMSCSPacketType; /** Server to client packet types. */ typedef enum { /** Control packets. */ /*@{*/ SC_PKT_CLIENT_ACCEPTED = 0x01, SC_PKT_PROTOCOL_ACCEPTED = 0x02, SC_PKT_PROTOCOL_FAILED = 0x03, SC_PKT_MEDIA_PKT_FOLLOWS = 0x05, SC_PKT_MEDIA_FILE_DETAILS = 0x06, SC_PKT_HEADER_REQUEST_ACCEPTED = 0x11, SC_PKT_TIMING_TEST_REPLY = 0x15, SC_PKT_PASSWORD_REQUIRED = 0x1a, SC_PKT_KEEPALIVE = 0x1b, SC_PKT_STREAM_STOPPED = 0x1e, SC_PKT_STREAM_CHANGING = 0x20, SC_PKT_STREAM_ID_ACCEPTED = 0x21, /*@}*/ /** Pseudo packets. */ /*@{*/ SC_PKT_CANCEL = -1, SC_PKT_NO_DATA = -2, /*@}*/ /** Data packets. */ /*@{*/ SC_PKT_ASF_HEADER = 0x010000,// make it bigger than 0xFF in case of SC_PKT_ASF_MEDIA = 0x010001,// receiving false data packets. /*@}*/ } MMSSCPacketType; typedef struct MMSTContext { MMSContext mms; int outgoing_packet_seq; ///< Outgoing packet sequence number. char path[256]; ///< Path of the resource being asked for. char host[128]; ///< Host of the resources. int incoming_packet_seq; ///< Incoming packet sequence number. int incoming_flags; ///< Incoming packet flags. int packet_id; ///< Identifier for packets in the current stream. unsigned int header_packet_id; ///< default is 2. } MMSTContext; /** Create MMST command packet header */ static void start_command_packet(MMSTContext *mmst, MMSCSPacketType packet_type) { MMSContext *mms = &mmst->mms; mms->write_out_ptr = mms->out_buffer; bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence bytestream_put_le32(&mms->write_out_ptr, 0xb00bface); bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' ')); bytestream_put_le32(&mms->write_out_ptr, 0); bytestream_put_le32(&mms->write_out_ptr, mmst->outgoing_packet_seq++); bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp bytestream_put_le32(&mms->write_out_ptr, 0); bytestream_put_le16(&mms->write_out_ptr, packet_type); bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server } /** Add prefixes to MMST command packet. */ static void insert_command_prefixes(MMSContext *mms, uint32_t prefix1, uint32_t prefix2) { bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix } /** Send a prepared MMST command packet. */ static int send_command_packet(MMSTContext *mmst) { MMSContext *mms = &mmst->mms; int len= mms->write_out_ptr - mms->out_buffer; int exact_length = FFALIGN(len, 8); int first_length= exact_length - 16; int len8= first_length/8; int write_result; // update packet length fields. AV_WL32(mms->out_buffer + 8, first_length); AV_WL32(mms->out_buffer + 16, len8); AV_WL32(mms->out_buffer + 32, len8-2); memset(mms->write_out_ptr, 0, exact_length - len); // write it out. write_result= ffurl_write(mms->mms_hd, mms->out_buffer, exact_length); if(write_result != exact_length) { av_log(NULL, AV_LOG_ERROR, "Failed to write data of length %d: %d (%s)\n", exact_length, write_result, write_result < 0 ? strerror(AVUNERROR(write_result)) : "The server closed the connection"); return AVERROR(EIO); } return 0; } static void mms_put_utf16(MMSContext *mms, uint8_t *src) { AVIOContext bic; int size = mms->write_out_ptr - mms->out_buffer; int len; ffio_init_context(&bic, mms->write_out_ptr, sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL); len = avio_put_str16le(&bic, src); mms->write_out_ptr += len; } static int send_time_test_data(MMSTContext *mmst) { start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST); insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b); return send_command_packet(mmst); } static int send_protocol_select(MMSTContext *mmst) { char data_string[256]; MMSContext *mms = &mmst->mms; start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT); insert_command_prefixes(mms, 0, 0xffffffff); bytestream_put_le32(&mms->write_out_ptr, 0); // maxFunnelBytes bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate bytestream_put_le32(&mms->write_out_ptr, 2); // funnelMode snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d", (LOCAL_ADDRESS>>24)&0xff, (LOCAL_ADDRESS>>16)&0xff, (LOCAL_ADDRESS>>8)&0xff, LOCAL_ADDRESS&0xff, "TCP", // or UDP LOCAL_PORT); mms_put_utf16(mms, data_string); return send_command_packet(mmst); } static int send_media_file_request(MMSTContext *mmst) { MMSContext *mms = &mmst->mms; start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST); insert_command_prefixes(mms, 1, 0xffffffff); bytestream_put_le32(&mms->write_out_ptr, 0); bytestream_put_le32(&mms->write_out_ptr, 0); mms_put_utf16(mms, mmst->path + 1); // +1 for skip "/" return send_command_packet(mmst); } static void handle_packet_stream_changing_type(MMSTContext *mmst) { MMSContext *mms = &mmst->mms; av_dlog(NULL, "Stream changing!\n"); // 40 is the packet header size, 7 is the prefix size. mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7); av_dlog(NULL, "Changed header prefix to 0x%x", mmst->header_packet_id); } static int send_keepalive_packet(MMSTContext *mmst) { // respond to a keepalive with a keepalive... start_command_packet(mmst, CS_PKT_KEEPALIVE); insert_command_prefixes(&mmst->mms, 1, 0x100FFFF); return send_command_packet(mmst); } /** Pad media packets smaller than max_packet_size and/or adjust read position * after a seek. */ static void pad_media_packet(MMSContext *mms) { if(mms->remaining_in_lenasf_packet_len) { int padding_size = mms->asf_packet_len - mms->remaining_in_len; memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size); mms->remaining_in_len += padding_size; } } /** Read incoming MMST media, header or command packet. */ static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst) { int read_result; MMSSCPacketType packet_type= -1; MMSContext *mms = &mmst->mms; for(;;) { read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer, 8); if (read_result != 8) { if(read_result < 0) { av_log(NULL, AV_LOG_ERROR, "Error reading packet header: %d (%s)\n", read_result, strerror(AVUNERROR(read_result))); packet_type = SC_PKT_CANCEL; } else { av_log(NULL, AV_LOG_ERROR, "The server closed the connection\n"); packet_type = SC_PKT_NO_DATA; } return packet_type; } // handle command packet. if(AV_RL32(mms->in_buffer + 4)==0xb00bface) { int length_remaining, hr; mmst->incoming_flags= mms->in_buffer[3]; read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer+8, 4); if(read_result != 4) { av_log(NULL, AV_LOG_ERROR, "Reading command packet length failed: %d (%s)\n", read_result, read_result < 0 ? strerror(AVUNERROR(read_result)) : "The server closed the connection"); return read_result < 0 ? read_result : AVERROR(EIO); } length_remaining= AV_RL32(mms->in_buffer+8) + 4; av_dlog(NULL, "Length remaining is %d\n", length_remaining); // read the rest of the packet. if (length_remaining < 0 || length_remaining > sizeof(mms->in_buffer) - 12) { av_log(NULL, AV_LOG_ERROR, "Incoming packet length %d exceeds bufsize %zu\n", length_remaining, sizeof(mms->in_buffer) - 12); return AVERROR_INVALIDDATA; } read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer + 12, length_remaining) ; if (read_result != length_remaining) { av_log(NULL, AV_LOG_ERROR, "Reading pkt data (length=%d) failed: %d (%s)\n", length_remaining, read_result, read_result < 0 ? strerror(AVUNERROR(read_result)) : "The server closed the connection"); return read_result < 0 ? read_result : AVERROR(EIO); } packet_type= AV_RL16(mms->in_buffer+36); if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) { av_log(NULL, AV_LOG_ERROR, "Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr); return AVERROR(EINVAL); } } else { int length_remaining; int packet_id_type; int tmp; // note we cache the first 8 bytes, // then fill up the buffer with the others tmp = AV_RL16(mms->in_buffer + 6); length_remaining = (tmp - 8) & 0xffff; mmst->incoming_packet_seq = AV_RL32(mms->in_buffer); packet_id_type = mms->in_buffer[4]; mmst->incoming_flags = mms->in_buffer[5]; if (length_remaining < 0 || length_remaining > sizeof(mms->in_buffer) - 8) { av_log(NULL, AV_LOG_ERROR, "Data length %d is invalid or too large (max=%zu)\n", length_remaining, sizeof(mms->in_buffer)); return AVERROR_INVALIDDATA; } mms->remaining_in_len = length_remaining; mms->read_in_ptr = mms->in_buffer; read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer, length_remaining); if(read_result != length_remaining) { av_log(NULL, AV_LOG_ERROR, "Failed to read packet data of size %d: %d (%s)\n", length_remaining, read_result, read_result < 0 ? strerror(AVUNERROR(read_result)) : "The server closed the connection"); return read_result < 0 ? read_result : AVERROR(EIO); } // if we successfully read everything. if(packet_id_type == mmst->header_packet_id) { int err; packet_type = SC_PKT_ASF_HEADER; // Store the asf header if(!mms->header_parsed) { if ((err = av_reallocp(&mms->asf_header, mms->asf_header_size + mms->remaining_in_len)) < 0) { mms->asf_header_size = 0; return err; } memcpy(mms->asf_header + mms->asf_header_size, mms->read_in_ptr, mms->remaining_in_len); mms->asf_header_size += mms->remaining_in_len; } // 0x04 means asf header is sent in multiple packets. if (mmst->incoming_flags == 0x04) continue; } else if(packet_id_type == mmst->packet_id) { packet_type = SC_PKT_ASF_MEDIA; } else { av_dlog(NULL, "packet id type %d is old.", packet_id_type); continue; } } // preprocess some packet type if(packet_type == SC_PKT_KEEPALIVE) { send_keepalive_packet(mmst); continue; } else if(packet_type == SC_PKT_STREAM_CHANGING) { handle_packet_stream_changing_type(mmst); } else if(packet_type == SC_PKT_ASF_MEDIA) { pad_media_packet(mms); } return packet_type; } } static int mms_safe_send_recv(MMSTContext *mmst, int (*send_fun)(MMSTContext *mmst), const MMSSCPacketType expect_type) { MMSSCPacketType type; if(send_fun) { int ret = send_fun(mmst); if (ret < 0) { av_dlog(NULL, "Send Packet error before expecting recv packet %d\n", expect_type); return ret; } } if ((type = get_tcp_server_response(mmst)) != expect_type) { av_log(NULL, AV_LOG_ERROR, "Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n", type, expect_type); return AVERROR_INVALIDDATA; } else { return 0; } } static int send_media_header_request(MMSTContext *mmst) { MMSContext *mms = &mmst->mms; start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST); insert_command_prefixes(mms, 1, 0); bytestream_put_le32(&mms->write_out_ptr, 0); bytestream_put_le32(&mms->write_out_ptr, 0x00800000); bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); bytestream_put_le32(&mms->write_out_ptr, 0); bytestream_put_le32(&mms->write_out_ptr, 0); bytestream_put_le32(&mms->write_out_ptr, 0); // the media preroll value in milliseconds? bytestream_put_le32(&mms->write_out_ptr, 0); bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000); bytestream_put_le32(&mms->write_out_ptr, 2); bytestream_put_le32(&mms->write_out_ptr, 0); return send_command_packet(mmst); } /** Send the initial handshake. */ static int send_startup_packet(MMSTContext *mmst) { char data_string[256]; MMSContext *mms = &mmst->mms; // SubscriberName is defined in MS specification linked below. // The guid value can be any valid value. // http://download.microsoft.com/ // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf snprintf(data_string, sizeof(data_string), "NSPlayer/7.0.0.1956; {%s}; Host: %s", "7E667F5D-A661-495E-A512-F55686DDA178", mmst->host); start_command_packet(mmst, CS_PKT_INITIAL); insert_command_prefixes(mms, 0, 0x0004000b); bytestream_put_le32(&mms->write_out_ptr, 0x0003001c); mms_put_utf16(mms, data_string); return send_command_packet(mmst); } /** Send MMST stream selection command based on the AVStream->discard values. */ static int send_stream_selection_request(MMSTContext *mmst) { int i; MMSContext *mms = &mmst->mms; // send the streams we want back... start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST); bytestream_put_le32(&mms->write_out_ptr, mms->stream_num); // stream nums for(i= 0; istream_num; i++) { bytestream_put_le16(&mms->write_out_ptr, 0xffff); // flags bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id); // stream id bytestream_put_le16(&mms->write_out_ptr, 0); // selection } return send_command_packet(mmst); } static int send_close_packet(MMSTContext *mmst) { start_command_packet(mmst, CS_PKT_STREAM_CLOSE); insert_command_prefixes(&mmst->mms, 1, 1); return send_command_packet(mmst); } /** Close the MMSH/MMST connection */ static int mms_close(URLContext *h) { MMSTContext *mmst = (MMSTContext *)h->priv_data; MMSContext *mms = &mmst->mms; if(mms->mms_hd) { send_close_packet(mmst); ffurl_close(mms->mms_hd); } /* free all separately allocated pointers in mms */ av_free(mms->streams); av_free(mms->asf_header); return 0; } static int send_media_packet_request(MMSTContext *mmst) { MMSContext *mms = &mmst->mms; start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID); insert_command_prefixes(mms, 1, 0x0001FFFF); bytestream_put_le64(&mms->write_out_ptr, 0); // seek timestamp bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit bytestream_put_byte(&mms->write_out_ptr, 0x00); // stream time limit flag mmst->packet_id++; // new packet_id bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id); return send_command_packet(mmst); } static void clear_stream_buffers(MMSContext *mms) { mms->remaining_in_len = 0; mms->read_in_ptr = mms->in_buffer; } static int mms_open(URLContext *h, const char *uri, int flags) { MMSTContext *mmst = h->priv_data; MMSContext *mms; int port, err; char tcpname[256]; h->is_streamed = 1; mms = &mmst->mms; // only for MMS over TCP, so set proto = NULL av_url_split(NULL, 0, NULL, 0, mmst->host, sizeof(mmst->host), &port, mmst->path, sizeof(mmst->path), uri); if(port<0) port = 1755; // defaut mms protocol port // establish tcp connection. ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL); err = ffurl_open(&mms->mms_hd, tcpname, AVIO_FLAG_READ_WRITE, &h->interrupt_callback, NULL); if (err) goto fail; mmst->packet_id = 3; // default, initial value. mmst->header_packet_id = 2; // default, initial value. err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED); if (err) goto fail; err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY); if (err) goto fail; err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED); if (err) goto fail; err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS); if (err) goto fail; err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED); if (err) goto fail; err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER); if (err) goto fail; if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) { av_log(NULL, AV_LOG_ERROR, "The server does not support MMST (try MMSH or RTSP)\n"); err = AVERROR(EINVAL); goto fail; } err = ff_mms_asf_header_parser(mms); if (err) { av_dlog(NULL, "asf header parsed failed!\n"); goto fail; } mms->header_parsed = 1; if (!mms->asf_packet_len || !mms->stream_num) goto fail; clear_stream_buffers(mms); err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED); if (err) goto fail; // send media packet request err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS); if (err) { goto fail; } av_dlog(NULL, "Leaving open (success)\n"); return 0; fail: mms_close(h); av_dlog(NULL, "Leaving open (failure: %d)\n", err); return err; } /** Read ASF data through the protocol. */ static int mms_read(URLContext *h, uint8_t *buf, int size) { /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */ MMSTContext *mmst = h->priv_data; MMSContext *mms = &mmst->mms; int result = 0; do { if(mms->asf_header_read_size < mms->asf_header_size) { /* Read from ASF header buffer */ result = ff_mms_read_header(mms, buf, size); } else if(mms->remaining_in_len) { /* Read remaining packet data to buffer. * the result can not be zero because remaining_in_len is positive.*/ result = ff_mms_read_data(mms, buf, size); } else { /* Read from network */ int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA); if (err == 0) { if(mms->remaining_in_len>mms->asf_packet_len) { av_log(NULL, AV_LOG_ERROR, "Incoming pktlen %d is larger than ASF pktsize %d\n", mms->remaining_in_len, mms->asf_packet_len); result= AVERROR(EIO); } else { // copy the data to the packet buffer. result = ff_mms_read_data(mms, buf, size); if (result == 0) { av_dlog(NULL, "Read ASF media packet size is zero!\n"); break; } } } else { av_dlog(NULL, "read packet error!\n"); break; } } } while(!result); // only return one packet. return result; } URLProtocol ff_mmst_protocol = { .name = "mmst", .url_open = mms_open, .url_read = mms_read, .url_close = mms_close, .priv_data_size = sizeof(MMSTContext), .flags = URL_PROTOCOL_FLAG_NETWORK, };