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);
}

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);
}

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 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);
}

/** 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_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);
}

/** 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 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);
}

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_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);
}