| /* |
| * MMS protocol over TCP |
| * Copyright (c) 2006,2007 Ryan Martell |
| * Copyright (c) 2007 Björn Axelsson |
| * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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 int mms_put_utf16(MMSContext *mms, const 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); |
| if (len < 0) |
| return len; |
| mms->write_out_ptr += len; |
| return 0; |
| } |
| |
| 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) |
| { |
| int ret; |
| 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); |
| |
| if ((ret = mms_put_utf16(mms, data_string)) < 0) |
| return ret; |
| return send_command_packet(mmst); |
| } |
| |
| static int send_media_file_request(MMSTContext *mmst) |
| { |
| int ret; |
| 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); |
| if ((ret = mms_put_utf16(mms, mmst->path + 1)) < 0) // +1 for skip "/" |
| return ret; |
| |
| return send_command_packet(mmst); |
| } |
| |
| static void handle_packet_stream_changing_type(MMSTContext *mmst) |
| { |
| MMSContext *mms = &mmst->mms; |
| av_log(NULL, AV_LOG_TRACE, "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_log(NULL, AV_LOG_TRACE, "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_len<mms->asf_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_log(NULL, AV_LOG_TRACE, "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 %"SIZE_SPECIFIER"\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=%"SIZE_SPECIFIER")\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_log(NULL, AV_LOG_TRACE, "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_log(NULL, AV_LOG_TRACE, "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]; |
| int ret; |
| 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); |
| if ((ret = mms_put_utf16(mms, data_string)) < 0) |
| return ret; |
| 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; i<mms->stream_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_freep(&mms->streams); |
| av_freep(&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_whitelist(&mms->mms_hd, tcpname, AVIO_FLAG_READ_WRITE, |
| &h->interrupt_callback, NULL, |
| h->protocol_whitelist); |
| 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_log(NULL, AV_LOG_TRACE, "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_log(NULL, AV_LOG_TRACE, "Leaving open (success)\n"); |
| return 0; |
| fail: |
| mms_close(h); |
| av_log(NULL, AV_LOG_TRACE, "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_log(NULL, AV_LOG_TRACE, "Read ASF media packet size is zero!\n"); |
| break; |
| } |
| } |
| } else { |
| av_log(NULL, AV_LOG_TRACE, "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, |
| }; |
