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/*
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 * MMS protocol over TCP
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 * Copyright (c) 2006,2007 Ryan Martell
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 * Copyright (c) 2007 Bj?rn Axelsson
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 * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/bytestream.h"
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#include "network.h"
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#include "asf.h"
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#define LOCAL_ADDRESS 0xc0a80081    // FIXME get and use correct local ip address.
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#define LOCAL_PORT    1037          // as above.
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/** Client to server packet types. */
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typedef enum {
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    CS_PKT_INITIAL                  = 0x01,
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    CS_PKT_PROTOCOL_SELECT          = 0x02,
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    CS_PKT_MEDIA_FILE_REQUEST       = 0x05,
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    CS_PKT_START_FROM_PKT_ID        = 0x07,
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    CS_PKT_STREAM_PAUSE             = 0x09,
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    CS_PKT_STREAM_CLOSE             = 0x0d,
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    CS_PKT_MEDIA_HEADER_REQUEST     = 0x15,
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    CS_PKT_TIMING_DATA_REQUEST      = 0x18,
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    CS_PKT_USER_PASSWORD            = 0x1a,
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    CS_PKT_KEEPALIVE                = 0x1b,
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    CS_PKT_STREAM_ID_REQUEST        = 0x33,
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} MMSCSPacketType;
46

    
47
/** Server to client packet types. */
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typedef enum {
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    /** Control packets. */
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    /*@{*/
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    SC_PKT_CLIENT_ACCEPTED          = 0x01,
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    SC_PKT_PROTOCOL_ACCEPTED        = 0x02,
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    SC_PKT_PROTOCOL_FAILED          = 0x03,
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    SC_PKT_MEDIA_PKT_FOLLOWS        = 0x05,
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    SC_PKT_MEDIA_FILE_DETAILS       = 0x06,
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    SC_PKT_HEADER_REQUEST_ACCEPTED  = 0x11,
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    SC_PKT_TIMING_TEST_REPLY        = 0x15,
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    SC_PKT_PASSWORD_REQUIRED        = 0x1a,
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    SC_PKT_KEEPALIVE                = 0x1b,
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    SC_PKT_STREAM_STOPPED           = 0x1e,
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    SC_PKT_STREAM_CHANGING          = 0x20,
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    SC_PKT_STREAM_ID_ACCEPTED       = 0x21,
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    /*@}*/
64

    
65
    /** Pseudo packets. */
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    /*@{*/
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    SC_PKT_CANCEL                   = -1,
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    SC_PKT_NO_DATA                  = -2,
69
    /*@}*/
70

    
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    /** Data packets. */
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    /*@{*/
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    SC_PKT_ASF_HEADER               = 0x010000,// make it bigger than 0xFF in case of
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    SC_PKT_ASF_MEDIA                = 0x010001,// receiving false data packets.
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    /*@}*/
76
} MMSSCPacketType;
77

    
78
typedef struct {
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    int id;
80
}MMSStream;
81

    
82
typedef struct {
83
    int outgoing_packet_seq;             ///< Outgoing packet sequence number.
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    char path[256];                      ///< Path of the resource being asked for.
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    char host[128];                      ///< Host of the resources.
86

    
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    URLContext *mms_hd;                  ///< TCP connection handle
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    MMSStream streams[MAX_STREAMS];
89

    
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    /** Buffer for outgoing packets. */
91
    /*@{*/
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    uint8_t *write_out_ptr;              ///< Pointer for writting the buffer.
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    uint8_t out_buffer[512];             ///< Buffer for outgoing packet.
94
    /*@}*/
95

    
96
    /** Buffer for incoming packets. */
97
    /*@{*/
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    uint8_t in_buffer[8192];             ///< Buffer for incoming packets.
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    uint8_t *read_in_ptr;                ///< Pointer for reading from incoming buffer.
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    int remaining_in_len;                ///< Reading length from incoming buffer.
101
    /*@}*/
102

    
103
    int incoming_packet_seq;             ///< Incoming packet sequence number.
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    int incoming_flags;                  ///< Incoming packet flags.
105

    
106
    int packet_id;                       ///< Identifier for packets in the current stream.
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    unsigned int header_packet_id;       ///< default is 2.
108

    
109
    /** Internal handling of the ASF header */
110
    /*@{*/
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    uint8_t *asf_header;                 ///< Stored ASF header.
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    int asf_header_size;                 ///< Size of stored ASF header.
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    int header_parsed;                   ///< The header has been received and parsed.
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    int asf_packet_len;
115
    /*@}*/
116

    
117
    int stream_num;                      ///< stream numbers.
118
    int is_playing;
119
} MMSContext;
120

    
121
/** Create MMST command packet header */
122
static void start_command_packet(MMSContext *mms, MMSCSPacketType packet_type)
123
{
124
    mms->write_out_ptr = mms->out_buffer;
125

    
126
    bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
127
    bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
128
    bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
129
    bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
130
    bytestream_put_le32(&mms->write_out_ptr, 0);
131
    bytestream_put_le32(&mms->write_out_ptr, mms->outgoing_packet_seq++);
132
    bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
133
    bytestream_put_le32(&mms->write_out_ptr, 0);
134
    bytestream_put_le16(&mms->write_out_ptr, packet_type);
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    bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
136
}
137

    
138
/** Add prefixes to MMST command packet. */
139
static void insert_command_prefixes(MMSContext *mms,
140
        uint32_t prefix1, uint32_t prefix2)
141
{
142
    bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
143
    bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
144
}
145

    
146
/** Send a prepared MMST command packet. */
147
static int send_command_packet(MMSContext *mms)
148
{
149
    int exact_length= mms->write_out_ptr - mms->out_buffer;
150
    int first_length= exact_length - 16;
151
    int len8= first_length/8;
152
    int write_result;
153

    
154
    // update packet length fields.
155
    AV_WL32(mms->out_buffer + 8, first_length);
156
    AV_WL32(mms->out_buffer + 16, len8);
157
    AV_WL32(mms->out_buffer + 32, len8-2);
158

    
159
    // write it out.
160
    write_result= url_write(mms->mms_hd, mms->out_buffer, exact_length);
161
    if(write_result != exact_length) {
162
        dprintf(NULL, "url_write returned: %d != %d\n",
163
                write_result, exact_length);
164
        return AVERROR_IO;
165
    }
166

    
167
    return 0;
168
}
169

    
170
static void mms_put_utf16(MMSContext *mms, uint8_t *src)
171
{
172
    ByteIOContext bic;
173
    int size = mms->write_out_ptr - mms->out_buffer;
174
    int len;
175
    init_put_byte(&bic, mms->write_out_ptr,
176
            sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
177

    
178
    len = ff_put_str16_nolen(&bic, src);
179
    mms->write_out_ptr += len;
180
}
181

    
182
static int send_protocol_select(MMSContext *mms)
183
{
184
    char data_string[256];
185

    
186
    start_command_packet(mms, CS_PKT_PROTOCOL_SELECT);
187
    insert_command_prefixes(mms, 0, 0xffffffff);
188
    bytestream_put_le32(&mms->write_out_ptr, 0);          // maxFunnelBytes
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    bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
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    bytestream_put_le32(&mms->write_out_ptr, 2);          // funnelMode
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    snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
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            (LOCAL_ADDRESS>>24)&0xff,
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            (LOCAL_ADDRESS>>16)&0xff,
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            (LOCAL_ADDRESS>>8)&0xff,
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            LOCAL_ADDRESS&0xff,
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            "TCP",                                        // or UDP
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            LOCAL_PORT);
198

    
199
    mms_put_utf16(mms, data_string);
200
    return send_command_packet(mms);
201
}
202

    
203
static int send_media_file_request(MMSContext *mms)
204
{
205
    start_command_packet(mms, CS_PKT_MEDIA_FILE_REQUEST);
206
    insert_command_prefixes(mms, 1, 0xffffffff);
207
    bytestream_put_le32(&mms->write_out_ptr, 0);
208
    bytestream_put_le32(&mms->write_out_ptr, 0);
209
    mms_put_utf16(mms, mms->path + 1); // +1 for skip "/"
210

    
211
    return send_command_packet(mms);
212
}
213

    
214
static void handle_packet_stream_changing_type(MMSContext *mms)
215
{
216
    dprintf(NULL, "Stream changing!\n");
217

    
218
    // 40 is the packet header size, 7 is the prefix size.
219
    mms->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
220
    dprintf(NULL, "Changed header prefix to 0x%x", mms->header_packet_id);
221
}
222

    
223
static int send_keepalive_packet(MMSContext *mms)
224
{
225
    // respond to a keepalive with a keepalive...
226
    start_command_packet(mms, CS_PKT_KEEPALIVE);
227
    insert_command_prefixes(mms, 1, 0x100FFFF);
228
    return send_command_packet(mms);
229
}
230

    
231
/** Pad media packets smaller than max_packet_size and/or adjust read position
232
  * after a seek. */
233
static void pad_media_packet(MMSContext *mms)
234
{
235
    if(mms->remaining_in_len<mms->asf_packet_len) {
236
        int padding_size = mms->asf_packet_len - mms->remaining_in_len;
237
        memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
238
        mms->remaining_in_len += padding_size;
239
    }
240
}
241

    
242
/** Read incoming MMST media, header or command packet. */
243
static MMSSCPacketType get_tcp_server_response(MMSContext *mms)
244
{
245
    int read_result;
246
    MMSSCPacketType packet_type= -1;
247

    
248
    for(;;) {
249
        if((read_result= url_read_complete(mms->mms_hd, mms->in_buffer, 8))==8) {
250
            // handle command packet.
251
            if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
252
                mms->incoming_flags= mms->in_buffer[3];
253
                read_result= url_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
254
                if(read_result == 4) {
255
                    int length_remaining= AV_RL32(mms->in_buffer+8) + 4;
256

    
257
                    dprintf(NULL, "Length remaining is %d\n", length_remaining);
258
                    // read the rest of the packet.
259
                    if (length_remaining < 0
260
                        || length_remaining > sizeof(mms->in_buffer) - 12) {
261
                        dprintf(NULL, "Incoming message len %d exceeds buffer len %d\n",
262
                            length_remaining, sizeof(mms->in_buffer) - 12);
263
                        return -1;
264
                    }
265
                    read_result = url_read_complete(mms->mms_hd, mms->in_buffer + 12,
266
                                                  length_remaining) ;
267
                    if (read_result == length_remaining) {
268
                        packet_type= AV_RL16(mms->in_buffer+36);
269
                    } else {
270
                        dprintf(NULL, "read for packet type failed%d!\n", read_result);
271
                        return -1;
272
                    }
273
                } else {
274
                    dprintf(NULL, "read for length remaining failed%d!\n", read_result);
275
                    return -1;
276
                }
277
            } else {
278
                int length_remaining;
279
                int packet_id_type;
280
                int tmp;
281

    
282
                assert(mms->remaining_in_len==0);
283

    
284
                // note we cache the first 8 bytes,
285
                // then fill up the buffer with the others
286
                tmp                       = AV_RL16(mms->in_buffer + 6);
287
                length_remaining          = (tmp - 8) & 0xffff;
288
                mms->incoming_packet_seq  = AV_RL32(mms->in_buffer);
289
                packet_id_type            = mms->in_buffer[4];
290
                mms->incoming_flags       = mms->in_buffer[5];
291

    
292
                if (length_remaining < 0
293
                        || length_remaining > sizeof(mms->in_buffer) - 8) {
294
                    dprintf(NULL, "Incoming data len %d exceeds buffer len %d\n",
295
                            length_remaining, sizeof(mms->in_buffer));
296
                    return -1;
297
                }
298
                mms->remaining_in_len    = length_remaining;
299
                mms->read_in_ptr         = mms->in_buffer;
300
                read_result= url_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
301
                if(read_result != length_remaining) {
302
                    dprintf(NULL, "read_bytes result: %d asking for %d\n",
303
                            read_result, length_remaining);
304
                    return -1;
305
                } else {
306
                    // if we successfully read everything.
307
                    if(packet_id_type == mms->header_packet_id) {
308
                        packet_type = SC_PKT_ASF_HEADER;
309
                        // Store the asf header
310
                        if(!mms->header_parsed) {
311
                            void *p = av_realloc(mms->asf_header,
312
                                              mms->asf_header_size
313
                                              + mms->remaining_in_len);
314
                            if (!p) {
315
                                av_freep(&mms->asf_header);
316
                                return AVERROR(ENOMEM);
317
                            }
318
                            mms->asf_header = p;
319
                            memcpy(mms->asf_header + mms->asf_header_size,
320
                                                 mms->read_in_ptr,
321
                                                 mms->remaining_in_len);
322
                            mms->asf_header_size += mms->remaining_in_len;
323
                        }
324
                    } else if(packet_id_type == mms->packet_id) {
325
                        packet_type = SC_PKT_ASF_MEDIA;
326
                    } else {
327
                        dprintf(NULL, "packet id type %d is old.", packet_id_type);
328
                        continue;
329
                    }
330
                }
331
            }
332

    
333
            // preprocess some packet type
334
            if(packet_type == SC_PKT_KEEPALIVE) {
335
                send_keepalive_packet(mms);
336
                continue;
337
            } else if(packet_type == SC_PKT_STREAM_CHANGING) {
338
                handle_packet_stream_changing_type(mms);
339
            } else if(packet_type == SC_PKT_ASF_MEDIA) {
340
                pad_media_packet(mms);
341
            }
342
            return packet_type;
343
        } else {
344
            if(read_result<0) {
345
                dprintf(NULL, "Read error (or cancelled) returned %d!\n", read_result);
346
                packet_type = SC_PKT_CANCEL;
347
            } else {
348
                dprintf(NULL, "Read result of zero?!\n");
349
                packet_type = SC_PKT_NO_DATA;
350
            }
351
            return packet_type;
352
        }
353
    }
354
}
355

    
356
static int mms_safe_send_recv(MMSContext *mms,
357
                              int (*send_fun)(MMSContext *mms),
358
                              const MMSSCPacketType expect_type)
359
{
360
    MMSSCPacketType type;
361
    if(send_fun) {
362
        int ret = send_fun(mms);
363
        if (ret < 0) {
364
            dprintf(NULL, "Send Packet error before expecting recv packet %d\n", expect_type);
365
            return ret;
366
        }
367
    }
368

    
369
    if ((type = get_tcp_server_response(mms)) != expect_type) {
370
        dprintf(NULL,"Unexpected packet type %d with type %d\n", type, expect_type);
371
        return -1;
372
    } else {
373
        return 0;
374
    }
375
}
376

    
377
static int send_media_header_request(MMSContext *mms)
378
{
379
    start_command_packet(mms, CS_PKT_MEDIA_HEADER_REQUEST);
380
    insert_command_prefixes(mms, 1, 0);
381
    bytestream_put_le32(&mms->write_out_ptr, 0);
382
    bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
383
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
384
    bytestream_put_le32(&mms->write_out_ptr, 0);
385
    bytestream_put_le32(&mms->write_out_ptr, 0);
386
    bytestream_put_le32(&mms->write_out_ptr, 0);
387

    
388
    // the media preroll value in milliseconds?
389
    bytestream_put_le32(&mms->write_out_ptr, 0);
390
    bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
391
    bytestream_put_le32(&mms->write_out_ptr, 2);
392
    bytestream_put_le32(&mms->write_out_ptr, 0);
393

    
394
    return send_command_packet(mms);
395
}
396

    
397
/** Send the initial handshake. */
398
static int send_startup_packet(MMSContext *mms)
399
{
400
    char data_string[256];
401
    // SubscriberName is defined in MS specification linked below.
402
    // The guid value can be any valid value.
403
    // http://download.microsoft.com/
404
    // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
405
    snprintf(data_string, sizeof(data_string),
406
            "NSPlayer/7.0.0.1956; {%s}; Host: %s",
407
            "7E667F5D-A661-495E-A512-F55686DDA178", mms->host);
408

    
409
    start_command_packet(mms, CS_PKT_INITIAL);
410
    insert_command_prefixes(mms, 0, 0x0004000b);
411
    bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
412
    mms_put_utf16(mms, data_string);
413
    return send_command_packet(mms);
414
}
415

    
416
static int asf_header_parser(MMSContext *mms)
417
{
418
    uint8_t *p = mms->asf_header;
419
    uint8_t *end;
420
    int flags, stream_id, real_header_size;
421
    mms->stream_num = 0;
422

    
423
    if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
424
        memcmp(p, ff_asf_header, sizeof(ff_asf_guid)))
425
        return -1;
426

    
427
    real_header_size = AV_RL64(p + sizeof(ff_asf_guid));
428
    end = mms->asf_header + real_header_size;
429

    
430
    p += sizeof(ff_asf_guid) + 14;
431
    while(end - p >= sizeof(ff_asf_guid) + 8) {
432
        uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid));
433
        if (!chunksize || chunksize > end - p) {
434
            dprintf(NULL, "chunksize is exceptional value:%d!\n", chunksize);
435
            return -1;
436
        }
437
        if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
438
            /* read packet size */
439
            if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
440
                mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
441
                if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
442
                    dprintf(NULL,"Too large packet len:%d"
443
                        " may overwrite in_buffer when padding", mms->asf_packet_len);
444
                    return -1;
445
                }
446
            }
447
        } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
448
            flags     = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
449
            stream_id = flags & 0x7F;
450
            //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
451
            //we can calcuate the packet size by stream_num.
452
            //Please see function send_stream_selection_request().
453
            if (mms->stream_num < MAX_STREAMS &&
454
                    46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
455
                mms->streams[mms->stream_num].id = stream_id;
456
                mms->stream_num++;
457
            } else {
458
                dprintf(NULL, "Too many streams.\n");
459
                return -1;
460
            }
461
        }
462
        p += chunksize;
463
    }
464

    
465
    return 0;
466
}
467

    
468
/** Send MMST stream selection command based on the AVStream->discard values. */
469
static int send_stream_selection_request(MMSContext *mms)
470
{
471
    int i;
472

    
473
    //  send the streams we want back...
474
    start_command_packet(mms, CS_PKT_STREAM_ID_REQUEST);
475
    bytestream_put_le32(&mms->write_out_ptr, mms->stream_num);         // stream nums
476
    for(i= 0; i<mms->stream_num; i++) {
477
        bytestream_put_le16(&mms->write_out_ptr, 0xffff);              // flags
478
        bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id);  // stream id
479
        bytestream_put_le16(&mms->write_out_ptr, 0);                   // selection
480
    }
481

    
482
    bytestream_put_le16(&mms->write_out_ptr, 0);
483

    
484
    return send_command_packet(mms);
485
}
486

    
487
static int read_data(MMSContext *mms, uint8_t *buf, const int buf_size)
488
{
489
    int read_size;
490
    read_size = FFMIN(buf_size, mms->remaining_in_len);
491
    memcpy(buf, mms->read_in_ptr, read_size);
492
    mms->remaining_in_len -= read_size;
493
    mms->read_in_ptr      += read_size;
494
    return read_size;
495
}
496

    
497
/** Read at most one media packet (or a whole header). */
498
static int read_mms_packet(MMSContext *mms, uint8_t *buf, int buf_size)
499
{
500
    int result = 0, read_header_size = 0;
501
    int size_to_copy;
502

    
503
    do {
504
        if(read_header_size < mms->asf_header_size && !mms->is_playing) {
505
            /* Read from ASF header buffer */
506
            size_to_copy= FFMIN(buf_size,
507
                                mms->asf_header_size - read_header_size);
508
            memcpy(buf, mms->asf_header + read_header_size, size_to_copy);
509
            read_header_size += size_to_copy;
510
            result += size_to_copy;
511
            dprintf(NULL, "Copied %d bytes from stored header. left: %d\n",
512
                   size_to_copy, mms->asf_header_size - read_header_size);
513
            if (mms->asf_header_size == read_header_size) {
514
                av_freep(&mms->asf_header);
515
                mms->is_playing = 1;
516
            }
517
        } else if(mms->remaining_in_len) {
518
            /* Read remaining packet data to buffer.
519
             * the result can not be zero because remaining_in_len is positive.*/
520
            result = read_data(mms, buf, buf_size);
521
        } else {
522
            /* Read from network */
523
            int err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_MEDIA);
524
            if (err == 0) {
525
                if(mms->remaining_in_len>mms->asf_packet_len) {
526
                    dprintf(NULL, "Incoming packet"
527
                            "larger than the asf packet size stated (%d>%d)\n",
528
                            mms->remaining_in_len, mms->asf_packet_len);
529
                    result= AVERROR_IO;
530
                } else {
531
                    // copy the data to the packet buffer.
532
                    result = read_data(mms, buf, buf_size);
533
                    if (result == 0) {
534
                        dprintf(NULL, "read asf media paket size is zero!\n");
535
                        break;
536
                    }
537
                }
538
            } else {
539
                dprintf(NULL, "read packet error!\n");
540
                break;
541
            }
542
        }
543
    } while(!result); // only return one packet.
544
    return result;
545
}
546

    
547
static int send_close_packet(MMSContext *mms)
548
{
549
    start_command_packet(mms, CS_PKT_STREAM_CLOSE);
550
    insert_command_prefixes(mms, 1, 1);
551

    
552
    return send_command_packet(mms);
553
}
554

    
555
/** Close the MMSH/MMST connection */
556
static int mms_close(URLContext *h)
557
{
558
    MMSContext *mms = (MMSContext *)h->priv_data;
559

    
560
    if(mms->mms_hd) {
561
        send_close_packet(mms);
562
        url_close(mms->mms_hd);
563
    }
564

    
565
    /* free all separately allocated pointers in mms */
566
    av_free(mms->asf_header);
567
    av_freep(&h->priv_data);
568

    
569
    return 0;
570
}
571

    
572
static int mms_open(URLContext *h, const char *uri, int flags)
573
{
574
    MMSContext *mms;
575
    int port, err;
576
    char tcpname[256];
577

    
578
    h->is_streamed = 1;
579
    mms = h->priv_data = av_mallocz(sizeof(MMSContext));
580
    if (!h->priv_data)
581
        return AVERROR(ENOMEM);
582

    
583
    // only for MMS over TCP, so set proto = NULL
584
    av_url_split(NULL, 0, NULL, 0,
585
            mms->host, sizeof(mms->host), &port, mms->path,
586
            sizeof(mms->path), uri);
587

    
588
    if(port<0)
589
        port = 1755; // defaut mms protocol port
590

    
591
    // establish tcp connection.
592
    ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mms->host, port, NULL);
593
    err = url_open(&mms->mms_hd, tcpname, URL_RDWR);
594
    if (err)
595
        goto fail;
596

    
597
    mms->packet_id        = 3;          // default, initial value.
598
    mms->header_packet_id = 2;          // default, initial value.
599
    err = mms_safe_send_recv(mms, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
600
    if (err)
601
        goto fail;
602
    err = mms_safe_send_recv(mms, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
603
    if (err)
604
        goto fail;
605
    err = mms_safe_send_recv(mms, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
606
    if (err)
607
        goto fail;
608
    err = mms_safe_send_recv(mms, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
609
    if (err)
610
        goto fail;
611
    err = mms_safe_send_recv(mms, NULL, SC_PKT_ASF_HEADER);
612
    if (err)
613
        goto fail;
614
    if((mms->incoming_flags != 0X08) && (mms->incoming_flags != 0X0C))
615
        goto fail;
616
    err = asf_header_parser(mms);
617
    if (err) {
618
        dprintf(NULL, "asf header parsed failed!\n");
619
        goto fail;
620
    }
621
    mms->header_parsed = 1;
622

    
623
    if (!mms->asf_packet_len || !mms->stream_num)
624
        goto fail;
625

    
626
    dprintf(NULL, "Leaving open (success)\n");
627
    return 0;
628
fail:
629
    mms_close(h);
630
    dprintf(NULL, "Leaving open (failure: %d)\n", err);
631
    return err;
632
}
633

    
634
static int send_media_packet_request(MMSContext *mms)
635
{
636
    start_command_packet(mms, CS_PKT_START_FROM_PKT_ID);
637
    insert_command_prefixes(mms, 1, 0x0001FFFF);
638
    bytestream_put_le64(&mms->write_out_ptr, 0);          // seek timestamp
639
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
640
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
641
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
642
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
643
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
644
    bytestream_put_byte(&mms->write_out_ptr, 0x00);       // stream time limit flag
645

    
646
    mms->packet_id++;                                     // new packet_id
647
    bytestream_put_le32(&mms->write_out_ptr, mms->packet_id);
648
    return send_command_packet(mms);
649
}
650

    
651

    
652
static void clear_stream_buffers(MMSContext *mms)
653
{
654
    mms->remaining_in_len = 0;
655
    mms->read_in_ptr      = mms->in_buffer;
656
}
657

    
658
/** Read ASF data through the protocol. */
659
static int mms_read(URLContext *h, uint8_t *buf, int size)
660
{
661
    /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
662
    MMSContext *mms = h->priv_data;
663
    int result = 0;
664

    
665
    /* Since we read the header at open(), this shouldn't be possible */
666
    assert(mms->header_parsed);
667

    
668
    if (!mms->is_playing) {
669
        dprintf(NULL, "mms_read() before play().\n");
670
        clear_stream_buffers(mms);
671
        result = mms_safe_send_recv(mms, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
672
        if (result)
673
            return result;
674
        // send media packet request
675
        result = mms_safe_send_recv(mms, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
676
        if (result) {
677
            return result;
678
        }
679
    }
680
    return read_mms_packet(mms, buf, size);
681
}
682

    
683
URLProtocol mmst_protocol = {
684
    "mmst",
685
    mms_open,
686
    mms_read,
687
    NULL, // write
688
    NULL, // seek
689
    mms_close,
690
};