From a24039861d92cc10bf09f2c64daabf4894a6fc0b Mon Sep 17 00:00:00 2001 From: Zhentan Feng Date: Mon, 24 May 2010 21:59:32 +0000 Subject: [PATCH] MMS-over-TCP protocol support. Patch by Zhentan Feng . Originally committed as revision 23301 to svn://svn.ffmpeg.org/ffmpeg/trunk --- Changelog | 1 + doc/general.texi | 1 + libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/avformat.h | 4 +- libavformat/mmst.c | 690 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 696 insertions(+), 2 deletions(-) create mode 100644 libavformat/mmst.c diff --git a/Changelog b/Changelog index 111125b2a6..628a82aceb 100644 --- a/Changelog +++ b/Changelog @@ -6,6 +6,7 @@ version : - WebM support in Matroska demuxer - low overhead Ogg muxing +- MMS-TCP support diff --git a/doc/general.texi b/doc/general.texi index bb199f6501..809bf933c3 100644 --- a/doc/general.texi +++ b/doc/general.texi @@ -687,6 +687,7 @@ performance on systems without hardware floating point support). @item file @tab X @item Gopher @tab X @item HTTP @tab X +@item MMS @tab X @item pipe @tab X @item RTP @tab X @item TCP @tab X diff --git a/libavformat/Makefile b/libavformat/Makefile index cffcd6ad5c..4c4b83bc2e 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -275,6 +275,7 @@ OBJS+= avio.o aviobuf.o OBJS-$(CONFIG_FILE_PROTOCOL) += file.o OBJS-$(CONFIG_GOPHER_PROTOCOL) += gopher.o OBJS-$(CONFIG_HTTP_PROTOCOL) += http.o httpauth.o +OBJS-$(CONFIG_MMST_PROTOCOL) += mmst.o asf.o OBJS-$(CONFIG_PIPE_PROTOCOL) += file.o # external or internal rtmp diff --git a/libavformat/allformats.c b/libavformat/allformats.c index c4db132cec..4d5a8a6c22 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -219,6 +219,7 @@ void av_register_all(void) REGISTER_PROTOCOL (FILE, file); REGISTER_PROTOCOL (GOPHER, gopher); REGISTER_PROTOCOL (HTTP, http); + REGISTER_PROTOCOL (MMST, mmst); REGISTER_PROTOCOL (PIPE, pipe); REGISTER_PROTOCOL (RTMP, rtmp); #if CONFIG_LIBRTMP diff --git a/libavformat/avformat.h b/libavformat/avformat.h index ae1b81480b..47b017815b 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -22,8 +22,8 @@ #define AVFORMAT_AVFORMAT_H #define LIBAVFORMAT_VERSION_MAJOR 52 -#define LIBAVFORMAT_VERSION_MINOR 64 -#define LIBAVFORMAT_VERSION_MICRO 1 +#define LIBAVFORMAT_VERSION_MINOR 65 +#define LIBAVFORMAT_VERSION_MICRO 0 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \ LIBAVFORMAT_VERSION_MINOR, \ diff --git a/libavformat/mmst.c b/libavformat/mmst.c new file mode 100644 index 0000000000..9b2e497c3c --- /dev/null +++ b/libavformat/mmst.c @@ -0,0 +1,690 @@ +/* + * 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 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 + */ +#include "avformat.h" +#include "internal.h" +#include "libavutil/intreadwrite.h" +#include "libavcodec/bytestream.h" +#include "network.h" +#include "asf.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 { + int id; +}MMSStream; + +typedef struct { + 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. + + URLContext *mms_hd; ///< TCP connection handle + MMSStream streams[MAX_STREAMS]; + + /** Buffer for outgoing packets. */ + /*@{*/ + uint8_t *write_out_ptr; ///< Pointer for writting the buffer. + uint8_t out_buffer[512]; ///< Buffer for outgoing packet. + /*@}*/ + + /** Buffer for incoming packets. */ + /*@{*/ + uint8_t in_buffer[8192]; ///< Buffer for incoming packets. + uint8_t *read_in_ptr; ///< Pointer for reading from incoming buffer. + int remaining_in_len; ///< Reading length from incoming buffer. + /*@}*/ + + 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. + + /** Internal handling of the ASF header */ + /*@{*/ + uint8_t *asf_header; ///< Stored ASF header. + int asf_header_size; ///< Size of stored ASF header. + int header_parsed; ///< The header has been received and parsed. + int asf_packet_len; + /*@}*/ + + int stream_num; ///< stream numbers. + int is_playing; +} MMSContext; + +/** Create MMST command packet header */ +static void start_command_packet(MMSContext *mms, MMSCSPacketType packet_type) +{ + 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, mms->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(MMSContext *mms) +{ + int exact_length= mms->write_out_ptr - mms->out_buffer; + 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); + + // write it out. + write_result= url_write(mms->mms_hd, mms->out_buffer, exact_length); + if(write_result != exact_length) { + dprintf(NULL, "url_write returned: %d != %d\n", + write_result, exact_length); + return AVERROR_IO; + } + + return 0; +} + +static void mms_put_utf16(MMSContext *mms, uint8_t *src) +{ + ByteIOContext bic; + int size = mms->write_out_ptr - mms->out_buffer; + int len; + init_put_byte(&bic, mms->write_out_ptr, + sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL); + + len = ff_put_str16_nolen(&bic, src); + mms->write_out_ptr += len; +} + +static int send_protocol_select(MMSContext *mms) +{ + char data_string[256]; + + start_command_packet(mms, 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(mms); +} + +static int send_media_file_request(MMSContext *mms) +{ + start_command_packet(mms, 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, mms->path + 1); // +1 for skip "/" + + return send_command_packet(mms); +} + +static void handle_packet_stream_changing_type(MMSContext *mms) +{ + dprintf(NULL, "Stream changing!\n"); + + // 40 is the packet header size, 7 is the prefix size. + mms->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7); + dprintf(NULL, "Changed header prefix to 0x%x", mms->header_packet_id); +} + +static int send_keepalive_packet(MMSContext *mms) +{ + // respond to a keepalive with a keepalive... + start_command_packet(mms, CS_PKT_KEEPALIVE); + insert_command_prefixes(mms, 1, 0x100FFFF); + return send_command_packet(mms); +} + +/** 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(MMSContext *mms) +{ + int read_result; + MMSSCPacketType packet_type= -1; + + for(;;) { + if((read_result= url_read_complete(mms->mms_hd, mms->in_buffer, 8))==8) { + // handle command packet. + if(AV_RL32(mms->in_buffer + 4)==0xb00bface) { + mms->incoming_flags= mms->in_buffer[3]; + read_result= url_read_complete(mms->mms_hd, mms->in_buffer+8, 4); + if(read_result == 4) { + int length_remaining= AV_RL32(mms->in_buffer+8) + 4; + + dprintf(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) { + dprintf("Incoming message len %d exceeds buffer len %d\n", + length_remaining, sizeof(mms->in_buffer) - 12); + return -1; + } + read_result = url_read_complete(mms->mms_hd, mms->in_buffer + 12, + length_remaining) ; + if (read_result == length_remaining) { + packet_type= AV_RL16(mms->in_buffer+36); + } else { + dprintf(NULL, "read for packet type failed%d!\n", read_result); + return -1; + } + } else { + dprintf(NULL, "read for length remaining failed%d!\n", read_result); + return -1; + } + } else { + int length_remaining; + int packet_id_type; + int tmp; + + assert(mms->remaining_in_len==0); + + // 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; + mms->incoming_packet_seq = AV_RL32(mms->in_buffer); + packet_id_type = mms->in_buffer[4]; + mms->incoming_flags = mms->in_buffer[5]; + + if (length_remaining < 0 + || length_remaining > sizeof(mms->in_buffer) - 8) { + dprintf("Incoming data len %d exceeds buffer len %d\n", + length_remaining, sizeof(mms->in_buffer)); + return -1; + } + mms->remaining_in_len = length_remaining; + mms->read_in_ptr = mms->in_buffer; + read_result= url_read_complete(mms->mms_hd, mms->in_buffer, length_remaining); + if(read_result != length_remaining) { + dprintf(NULL, "read_bytes result: %d asking for %d\n", + read_result, length_remaining); + return -1; + } else { + // if we successfully read everything. + if(packet_id_type == mms->header_packet_id) { + packet_type = SC_PKT_ASF_HEADER; + // Store the asf header + if(!mms->header_parsed) { + void *p = av_realloc(mms->asf_header, + mms->asf_header_size + + mms->remaining_in_len); + if (!p) { + av_freep(&mms->asf_header); + return AVERROR(ENOMEM); + } + mms->asf_header = p; + memcpy(mms->asf_header + mms->asf_header_size, + mms->read_in_ptr, + mms->remaining_in_len); + mms->asf_header_size += mms->remaining_in_len; + } + } else if(packet_id_type == mms->packet_id) { + packet_type = SC_PKT_ASF_MEDIA; + } else { + dprintf(NULL, "packet id type %d is old.", packet_id_type); + continue; + } + } + } + + // preprocess some packet type + if(packet_type == SC_PKT_KEEPALIVE) { + send_keepalive_packet(mms); + continue; + } else if(packet_type == SC_PKT_STREAM_CHANGING) { + handle_packet_stream_changing_type(mms); + } else if(packet_type == SC_PKT_ASF_MEDIA) { + pad_media_packet(mms); + } + return packet_type; + } else { + if(read_result<0) { + dprintf(NULL, "Read error (or cancelled) returned %d!\n", read_result); + packet_type = SC_PKT_CANCEL; + } else { + dprintf(NULL, "Read result of zero?!\n"); + packet_type = SC_PKT_NO_DATA; + } + return packet_type; + } + } +} + +static int mms_safe_send_recv(MMSContext *mms, + int (*send_fun)(MMSContext *mms), + const MMSSCPacketType expect_type) +{ + MMSSCPacketType type; + if(send_fun) { + int ret = send_fun(mms); + if (ret < 0) { + dprintf(NULL, "Send Packet error before expecting recv packet %d\n", expect_type); + return ret; + } + } + + if ((type = get_tcp_server_response(mms)) != expect_type) { + dprintf(NULL,"Unexpected packet type %d with type %d\n", type, expect_type); + return -1; + } else { + return 0; + } +} + +static int send_media_header_request(MMSContext *mms) +{ + start_command_packet(mms, 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(mms); +} + +/** Send the initial handshake. */ +static int send_startup_packet(MMSContext *mms) +{ + char data_string[256]; + // 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", mms->host); + + start_command_packet(mms, 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(mms); +} + +static int asf_header_parser(MMSContext *mms) +{ + uint8_t *p = mms->asf_header; + uint8_t *end; + int flags, stream_id, real_header_size; + mms->stream_num = 0; + + if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 || + memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) + return -1; + + real_header_size = AV_RL64(p + sizeof(ff_asf_guid)); + end = mms->asf_header + real_header_size; + + p += sizeof(ff_asf_guid) + 14; + while(end - p >= sizeof(ff_asf_guid) + 8) { + uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid)); + if (!chunksize || chunksize > end - p) { + dprintf("chunksize is exceptional value:%d!\n", chunksize); + return -1; + } + if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) { + /* read packet size */ + if (end - p > sizeof(ff_asf_guid) * 2 + 68) { + mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64); + if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) { + dprintf(NULL,"Too large packet len:%d" + " may overwrite in_buffer when padding", mms->asf_packet_len); + return -1; + } + } + } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) { + flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24); + stream_id = flags & 0x7F; + //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size, + //we can calcuate the packet size by stream_num. + //Please see function send_stream_selection_request(). + if (mms->stream_num < MAX_STREAMS && + 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) { + mms->streams[mms->stream_num].id = stream_id; + mms->stream_num++; + } else { + dprintf("Too many streams.\n"); + return -1; + } + } + p += chunksize; + } + + return 0; +} + +/** Send MMST stream selection command based on the AVStream->discard values. */ +static int send_stream_selection_request(MMSContext *mms) +{ + int i; + + // send the streams we want back... + start_command_packet(mms, 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 + } + + bytestream_put_le16(&mms->write_out_ptr, 0); + + return send_command_packet(mms); +} + +static int read_data(MMSContext *mms, uint8_t *buf, const int buf_size) +{ + int read_size; + read_size = FFMIN(buf_size, mms->remaining_in_len); + memcpy(buf, mms->read_in_ptr, read_size); + mms->remaining_in_len -= read_size; + mms->read_in_ptr += read_size; + return read_size; +} + +/** Read at most one media packet (or a whole header). */ +static int read_mms_packet(MMSContext *mms, uint8_t *buf, int buf_size) +{ + int result = 0, read_header_size = 0; + int size_to_copy; + + do { + if(read_header_size < mms->asf_header_size && !mms->is_playing) { + /* Read from ASF header buffer */ + size_to_copy= FFMIN(buf_size, + mms->asf_header_size - read_header_size); + memcpy(buf, mms->asf_header + read_header_size, size_to_copy); + read_header_size += size_to_copy; + result += size_to_copy; + dprintf(NULL, "Copied %d bytes from stored header. left: %d\n", + size_to_copy, mms->asf_header_size - read_header_size); + if (mms->asf_header_size == read_header_size) { + av_freep(&mms->asf_header); + mms->is_playing = 1; + } + } 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 = read_data(mms, buf, buf_size); + } else { + /* Read from network */ + int err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_MEDIA); + if (err == 0) { + if(mms->remaining_in_len>mms->asf_packet_len) { + dprintf(NULL, "Incoming packet" + "larger than the asf packet size stated (%d>%d)\n", + mms->remaining_in_len, mms->asf_packet_len); + result= AVERROR_IO; + } else { + // copy the data to the packet buffer. + result = read_data(mms, buf, buf_size); + if (result == 0) { + dprintf(NULL, "read asf media paket size is zero!\n"); + break; + } + } + } else { + dprintf(NULL, "read packet error!\n"); + break; + } + } + } while(!result); // only return one packet. + return result; +} + +static int send_close_packet(MMSContext *mms) +{ + start_command_packet(mms, CS_PKT_STREAM_CLOSE); + insert_command_prefixes(mms, 1, 1); + + return send_command_packet(mms); +} + +/** Close the MMSH/MMST connection */ +static int mms_close(URLContext *h) +{ + MMSContext *mms = (MMSContext *)h->priv_data; + + if(mms->mms_hd) { + send_close_packet(mms); + url_close(mms->mms_hd); + } + + /* free all separately allocated pointers in mms */ + av_free(mms->asf_header); + av_freep(&h->priv_data); + + return 0; +} + +static int mms_open(URLContext *h, const char *uri, int flags) +{ + MMSContext *mms; + int port, err; + char tcpname[256]; + + h->is_streamed = 1; + mms = h->priv_data = av_mallocz(sizeof(MMSContext)); + if (!h->priv_data) + return AVERROR(ENOMEM); + + // only for MMS over TCP, so set proto = NULL + ff_url_split(NULL, 0, NULL, 0, + mms->host, sizeof(mms->host), &port, mms->path, + sizeof(mms->path), uri); + + if(port<0) + port = 1755; // defaut mms protocol port + + // establish tcp connection. + ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mms->host, port, NULL); + err = url_open(&mms->mms_hd, tcpname, URL_RDWR); + if (err) + goto fail; + + mms->packet_id = 3; // default, initial value. + mms->header_packet_id = 2; // default, initial value. + err = mms_safe_send_recv(mms, send_startup_packet, SC_PKT_CLIENT_ACCEPTED); + if (err) + goto fail; + err = mms_safe_send_recv(mms, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED); + if (err) + goto fail; + err = mms_safe_send_recv(mms, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS); + if (err) + goto fail; + err = mms_safe_send_recv(mms, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED); + if (err) + goto fail; + err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_HEADER); + if (err) + goto fail; + if((mms->incoming_flags != 0X08) && (mms->incoming_flags != 0X0C)) + goto fail; + err = asf_header_parser(mms); + if (err) { + dprintf(NULL, "asf header parsed failed!\n"); + goto fail; + } + mms->header_parsed = 1; + + if (!mms->asf_packet_len || !mms->stream_num) + goto fail; + + dprintf(NULL, "Leaving open (success)\n"); + return 0; +fail: + mms_close(h); + dprintf(NULL, "Leaving open (failure: %d)\n", err); + return err; +} + +static int send_media_packet_request(MMSContext *mms) +{ + start_command_packet(mms, 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 + + mms->packet_id++; // new packet_id + bytestream_put_le32(&mms->write_out_ptr, mms->packet_id); + return send_command_packet(mms); +} + + +static void clear_stream_buffers(MMSContext *mms) +{ + mms->remaining_in_len = 0; + mms->read_in_ptr = mms->in_buffer; +} + +/** 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 */ + MMSContext *mms = h->priv_data; + int result = 0; + + /* Since we read the header at open(), this shouldn't be possible */ + assert(mms->header_parsed); + + if (!mms->is_playing) { + dprintf(NULL, "mms_read() before play().\n"); + clear_stream_buffers(mms); + result = mms_safe_send_recv(mms, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED); + if (result) + return result; + // send media packet request + result = mms_safe_send_recv(mms, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS); + if (result) { + return result; + } + } + return read_mms_packet(mms, buf, size); +} + +URLProtocol mmst_protocol = { + "mmst", + mms_open, + mms_read, + NULL, // write + NULL, // seek + mms_close, +};