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ffmpeg / libavformat / mmst.c @ 275189a2

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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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 */
23

    
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/* References
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 * MMS protocol specification:
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 *  [1]http://msdn.microsoft.com/en-us/library/cc234711(PROT.10).aspx
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 * ASF specification. Revision 01.20.03.
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 *  [2]http://msdn.microsoft.com/en-us/library/bb643323.aspx
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 */
30

    
31
#include "avformat.h"
32
#include "mms.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"
37

    
38
#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;
54

    
55
/** 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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    /*@}*/
72

    
73
    /** Pseudo packets. */
74
    /*@{*/
75
    SC_PKT_CANCEL                   = -1,
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    SC_PKT_NO_DATA                  = -2,
77
    /*@}*/
78

    
79
    /** Data packets. */
80
    /*@{*/
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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.
83
    /*@}*/
84
} MMSSCPacketType;
85

    
86
typedef struct {
87
    MMSContext  mms;
88
    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.
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    int incoming_packet_seq;             ///< Incoming packet sequence number.
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    int incoming_flags;                  ///< Incoming packet flags.
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    int packet_id;                       ///< Identifier for packets in the current stream.
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    unsigned int header_packet_id;       ///< default is 2.
95
} MMSTContext;
96

    
97
/** Create MMST command packet header */
98
static void start_command_packet(MMSTContext *mmst, MMSCSPacketType packet_type)
99
{
100
    MMSContext *mms    = &mmst->mms;
101
    mms->write_out_ptr = mms->out_buffer;
102

    
103
    bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
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    bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
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    bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
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    bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
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    bytestream_put_le32(&mms->write_out_ptr, 0);
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    bytestream_put_le32(&mms->write_out_ptr, mmst->outgoing_packet_seq++);
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    bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
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    bytestream_put_le32(&mms->write_out_ptr, 0);
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    bytestream_put_le16(&mms->write_out_ptr, packet_type);
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    bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
113
}
114

    
115
/** Add prefixes to MMST command packet. */
116
static void insert_command_prefixes(MMSContext *mms,
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        uint32_t prefix1, uint32_t prefix2)
118
{
119
    bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
120
    bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
121
}
122

    
123
/** Send a prepared MMST command packet. */
124
static int send_command_packet(MMSTContext *mmst)
125
{
126
    MMSContext *mms  = &mmst->mms;
127
    int len= mms->write_out_ptr - mms->out_buffer;
128
    int exact_length = FFALIGN(len, 8);
129
    int first_length= exact_length - 16;
130
    int len8= first_length/8;
131
    int write_result;
132

    
133
    // update packet length fields.
134
    AV_WL32(mms->out_buffer + 8, first_length);
135
    AV_WL32(mms->out_buffer + 16, len8);
136
    AV_WL32(mms->out_buffer + 32, len8-2);
137
    memset(mms->write_out_ptr, 0, exact_length - len);
138

    
139
    // write it out.
140
    write_result= url_write(mms->mms_hd, mms->out_buffer, exact_length);
141
    if(write_result != exact_length) {
142
        av_log(NULL, AV_LOG_ERROR,
143
               "Failed to write data of length %d: %d (%s)\n",
144
               exact_length, write_result,
145
               write_result < 0 ? strerror(write_result) :
146
                   "The server closed the connection");
147
        return AVERROR_IO;
148
    }
149

    
150
    return 0;
151
}
152

    
153
static void mms_put_utf16(MMSContext *mms, uint8_t *src)
154
{
155
    ByteIOContext bic;
156
    int size = mms->write_out_ptr - mms->out_buffer;
157
    int len;
158
    init_put_byte(&bic, mms->write_out_ptr,
159
            sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
160

    
161
    len = avio_put_str16le(&bic, src);
162
    mms->write_out_ptr += len;
163
}
164

    
165
static int send_time_test_data(MMSTContext *mmst)
166
{
167
    start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST);
168
    insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b);
169
    return send_command_packet(mmst);
170
}
171

    
172
static int send_protocol_select(MMSTContext *mmst)
173
{
174
    char data_string[256];
175
    MMSContext *mms = &mmst->mms;
176

    
177
    start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT);
178
    insert_command_prefixes(mms, 0, 0xffffffff);
179
    bytestream_put_le32(&mms->write_out_ptr, 0);          // maxFunnelBytes
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    bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
181
    bytestream_put_le32(&mms->write_out_ptr, 2);          // funnelMode
182
    snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
183
            (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
188
            LOCAL_PORT);
189

    
190
    mms_put_utf16(mms, data_string);
191
    return send_command_packet(mmst);
192
}
193

    
194
static int send_media_file_request(MMSTContext *mmst)
195
{
196
    MMSContext *mms = &mmst->mms;
197
    start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST);
198
    insert_command_prefixes(mms, 1, 0xffffffff);
199
    bytestream_put_le32(&mms->write_out_ptr, 0);
200
    bytestream_put_le32(&mms->write_out_ptr, 0);
201
    mms_put_utf16(mms, mmst->path + 1); // +1 for skip "/"
202

    
203
    return send_command_packet(mmst);
204
}
205

    
206
static void handle_packet_stream_changing_type(MMSTContext *mmst)
207
{
208
    MMSContext *mms = &mmst->mms;
209
    av_dlog(NULL, "Stream changing!\n");
210

    
211
    // 40 is the packet header size, 7 is the prefix size.
212
    mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
213
    av_dlog(NULL, "Changed header prefix to 0x%x", mmst->header_packet_id);
214
}
215

    
216
static int send_keepalive_packet(MMSTContext *mmst)
217
{
218
    // respond to a keepalive with a keepalive...
219
    start_command_packet(mmst, CS_PKT_KEEPALIVE);
220
    insert_command_prefixes(&mmst->mms, 1, 0x100FFFF);
221
    return send_command_packet(mmst);
222
}
223

    
224
/** Pad media packets smaller than max_packet_size and/or adjust read position
225
  * after a seek. */
226
static void pad_media_packet(MMSContext *mms)
227
{
228
    if(mms->remaining_in_len<mms->asf_packet_len) {
229
        int padding_size = mms->asf_packet_len - mms->remaining_in_len;
230
        memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
231
        mms->remaining_in_len += padding_size;
232
    }
233
}
234

    
235
/** Read incoming MMST media, header or command packet. */
236
static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
237
{
238
    int read_result;
239
    MMSSCPacketType packet_type= -1;
240
    MMSContext *mms = &mmst->mms;
241
    for(;;) {
242
        read_result = url_read_complete(mms->mms_hd, mms->in_buffer, 8);
243
        if (read_result != 8) {
244
            if(read_result < 0) {
245
                av_log(NULL, AV_LOG_ERROR,
246
                       "Error reading packet header: %d (%s)\n",
247
                       read_result, strerror(read_result));
248
                packet_type = SC_PKT_CANCEL;
249
            } else {
250
                av_log(NULL, AV_LOG_ERROR,
251
                       "The server closed the connection\n");
252
                packet_type = SC_PKT_NO_DATA;
253
            }
254
            return packet_type;
255
        }
256

    
257
        // handle command packet.
258
        if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
259
            int length_remaining, hr;
260

    
261
            mmst->incoming_flags= mms->in_buffer[3];
262
            read_result= url_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
263
            if(read_result != 4) {
264
                av_log(NULL, AV_LOG_ERROR,
265
                       "Reading command packet length failed: %d (%s)\n",
266
                       read_result,
267
                       read_result < 0 ? strerror(read_result) :
268
                           "The server closed the connection");
269
                return read_result < 0 ? read_result : AVERROR_IO;
270
            }
271

    
272
            length_remaining= AV_RL32(mms->in_buffer+8) + 4;
273
            av_dlog(NULL, "Length remaining is %d\n", length_remaining);
274
            // read the rest of the packet.
275
            if (length_remaining < 0
276
                || length_remaining > sizeof(mms->in_buffer) - 12) {
277
                av_log(NULL, AV_LOG_ERROR,
278
                       "Incoming packet length %d exceeds bufsize %zu\n",
279
                       length_remaining, sizeof(mms->in_buffer) - 12);
280
                return AVERROR_INVALIDDATA;
281
            }
282
            read_result = url_read_complete(mms->mms_hd, mms->in_buffer + 12,
283
                                            length_remaining) ;
284
            if (read_result != length_remaining) {
285
                av_log(NULL, AV_LOG_ERROR,
286
                       "Reading pkt data (length=%d) failed: %d (%s)\n",
287
                       length_remaining, read_result,
288
                       read_result < 0 ? strerror(read_result) :
289
                           "The server closed the connection");
290
                return read_result < 0 ? read_result : AVERROR_IO;
291
            }
292
            packet_type= AV_RL16(mms->in_buffer+36);
293
            if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) {
294
                av_log(NULL, AV_LOG_ERROR,
295
                       "Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr);
296
                return AVERROR_UNKNOWN;
297
            }
298
        } else {
299
            int length_remaining;
300
            int packet_id_type;
301
            int tmp;
302

    
303
            // note we cache the first 8 bytes,
304
            // then fill up the buffer with the others
305
            tmp                       = AV_RL16(mms->in_buffer + 6);
306
            length_remaining          = (tmp - 8) & 0xffff;
307
            mmst->incoming_packet_seq = AV_RL32(mms->in_buffer);
308
            packet_id_type            = mms->in_buffer[4];
309
            mmst->incoming_flags      = mms->in_buffer[5];
310

    
311
            if (length_remaining < 0
312
                || length_remaining > sizeof(mms->in_buffer) - 8) {
313
                av_log(NULL, AV_LOG_ERROR,
314
                       "Data length %d is invalid or too large (max=%zu)\n",
315
                       length_remaining, sizeof(mms->in_buffer));
316
                return AVERROR_INVALIDDATA;
317
            }
318
            mms->remaining_in_len    = length_remaining;
319
            mms->read_in_ptr         = mms->in_buffer;
320
            read_result= url_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
321
            if(read_result != length_remaining) {
322
                av_log(NULL, AV_LOG_ERROR,
323
                       "Failed to read packet data of size %d: %d (%s)\n",
324
                       length_remaining, read_result,
325
                       read_result < 0 ? strerror(read_result) :
326
                           "The server closed the connection");
327
                return read_result < 0 ? read_result : AVERROR_IO;
328
            }
329

    
330
            // if we successfully read everything.
331
            if(packet_id_type == mmst->header_packet_id) {
332
                packet_type = SC_PKT_ASF_HEADER;
333
                // Store the asf header
334
                if(!mms->header_parsed) {
335
                    void *p = av_realloc(mms->asf_header,
336
                                  mms->asf_header_size + mms->remaining_in_len);
337
                    if (!p) {
338
                        av_freep(&mms->asf_header);
339
                        return AVERROR(ENOMEM);
340
                    }
341
                    mms->asf_header = p;
342
                    memcpy(mms->asf_header + mms->asf_header_size,
343
                           mms->read_in_ptr, mms->remaining_in_len);
344
                    mms->asf_header_size += mms->remaining_in_len;
345
                }
346
                // 0x04 means asf header is sent in multiple packets.
347
                if (mmst->incoming_flags == 0x04)
348
                    continue;
349
            } else if(packet_id_type == mmst->packet_id) {
350
                packet_type = SC_PKT_ASF_MEDIA;
351
            } else {
352
                av_dlog(NULL, "packet id type %d is old.", packet_id_type);
353
                continue;
354
            }
355
        }
356

    
357
        // preprocess some packet type
358
        if(packet_type == SC_PKT_KEEPALIVE) {
359
            send_keepalive_packet(mmst);
360
            continue;
361
        } else if(packet_type == SC_PKT_STREAM_CHANGING) {
362
            handle_packet_stream_changing_type(mmst);
363
        } else if(packet_type == SC_PKT_ASF_MEDIA) {
364
            pad_media_packet(mms);
365
        }
366
        return packet_type;
367
    }
368
}
369

    
370
static int mms_safe_send_recv(MMSTContext *mmst,
371
                              int (*send_fun)(MMSTContext *mmst),
372
                              const MMSSCPacketType expect_type)
373
{
374
    MMSSCPacketType type;
375
    if(send_fun) {
376
        int ret = send_fun(mmst);
377
        if (ret < 0) {
378
            av_dlog(NULL, "Send Packet error before expecting recv packet %d\n", expect_type);
379
            return ret;
380
        }
381
    }
382

    
383
    if ((type = get_tcp_server_response(mmst)) != expect_type) {
384
        av_log(NULL, AV_LOG_ERROR,
385
               "Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
386
               type, expect_type);
387
        return AVERROR_INVALIDDATA;
388
    } else {
389
        return 0;
390
    }
391
}
392

    
393
static int send_media_header_request(MMSTContext *mmst)
394
{
395
    MMSContext *mms = &mmst->mms;
396
    start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST);
397
    insert_command_prefixes(mms, 1, 0);
398
    bytestream_put_le32(&mms->write_out_ptr, 0);
399
    bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
400
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
401
    bytestream_put_le32(&mms->write_out_ptr, 0);
402
    bytestream_put_le32(&mms->write_out_ptr, 0);
403
    bytestream_put_le32(&mms->write_out_ptr, 0);
404

    
405
    // the media preroll value in milliseconds?
406
    bytestream_put_le32(&mms->write_out_ptr, 0);
407
    bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
408
    bytestream_put_le32(&mms->write_out_ptr, 2);
409
    bytestream_put_le32(&mms->write_out_ptr, 0);
410

    
411
    return send_command_packet(mmst);
412
}
413

    
414
/** Send the initial handshake. */
415
static int send_startup_packet(MMSTContext *mmst)
416
{
417
    char data_string[256];
418
    MMSContext *mms = &mmst->mms;
419
    // SubscriberName is defined in MS specification linked below.
420
    // The guid value can be any valid value.
421
    // http://download.microsoft.com/
422
    // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
423
    snprintf(data_string, sizeof(data_string),
424
            "NSPlayer/7.0.0.1956; {%s}; Host: %s",
425
            "7E667F5D-A661-495E-A512-F55686DDA178", mmst->host);
426

    
427
    start_command_packet(mmst, CS_PKT_INITIAL);
428
    insert_command_prefixes(mms, 0, 0x0004000b);
429
    bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
430
    mms_put_utf16(mms, data_string);
431
    return send_command_packet(mmst);
432
}
433

    
434
/** Send MMST stream selection command based on the AVStream->discard values. */
435
static int send_stream_selection_request(MMSTContext *mmst)
436
{
437
    int i;
438
    MMSContext *mms = &mmst->mms;
439
    //  send the streams we want back...
440
    start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST);
441
    bytestream_put_le32(&mms->write_out_ptr, mms->stream_num);         // stream nums
442
    for(i= 0; i<mms->stream_num; i++) {
443
        bytestream_put_le16(&mms->write_out_ptr, 0xffff);              // flags
444
        bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id);  // stream id
445
        bytestream_put_le16(&mms->write_out_ptr, 0);                   // selection
446
    }
447
    return send_command_packet(mmst);
448
}
449

    
450
static int send_close_packet(MMSTContext *mmst)
451
{
452
    start_command_packet(mmst, CS_PKT_STREAM_CLOSE);
453
    insert_command_prefixes(&mmst->mms, 1, 1);
454

    
455
    return send_command_packet(mmst);
456
}
457

    
458
/** Close the MMSH/MMST connection */
459
static int mms_close(URLContext *h)
460
{
461
    MMSTContext *mmst = (MMSTContext *)h->priv_data;
462
    MMSContext *mms   = &mmst->mms;
463
    if(mms->mms_hd) {
464
        send_close_packet(mmst);
465
        url_close(mms->mms_hd);
466
    }
467

    
468
    /* free all separately allocated pointers in mms */
469
    av_free(mms->streams);
470
    av_free(mms->asf_header);
471
    av_freep(&h->priv_data);
472

    
473
    return 0;
474
}
475

    
476
static int send_media_packet_request(MMSTContext *mmst)
477
{
478
    MMSContext *mms = &mmst->mms;
479
    start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID);
480
    insert_command_prefixes(mms, 1, 0x0001FFFF);
481
    bytestream_put_le64(&mms->write_out_ptr, 0);          // seek timestamp
482
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
483
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
484
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
485
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
486
    bytestream_put_byte(&mms->write_out_ptr, 0xff);       // max stream time limit
487
    bytestream_put_byte(&mms->write_out_ptr, 0x00);       // stream time limit flag
488

    
489
    mmst->packet_id++;                                     // new packet_id
490
    bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id);
491
    return send_command_packet(mmst);
492
}
493

    
494

    
495
static void clear_stream_buffers(MMSContext *mms)
496
{
497
    mms->remaining_in_len = 0;
498
    mms->read_in_ptr      = mms->in_buffer;
499
}
500

    
501
static int mms_open(URLContext *h, const char *uri, int flags)
502
{
503
    MMSTContext *mmst;
504
    MMSContext *mms;
505
    int port, err;
506
    char tcpname[256];
507

    
508
    h->is_streamed = 1;
509
    mmst = h->priv_data = av_mallocz(sizeof(MMSTContext));
510
    if (!h->priv_data)
511
        return AVERROR(ENOMEM);
512
    mms = &mmst->mms;
513

    
514
    // only for MMS over TCP, so set proto = NULL
515
    av_url_split(NULL, 0, NULL, 0,
516
            mmst->host, sizeof(mmst->host), &port, mmst->path,
517
            sizeof(mmst->path), uri);
518

    
519
    if(port<0)
520
        port = 1755; // defaut mms protocol port
521

    
522
    // establish tcp connection.
523
    ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL);
524
    err = url_open(&mms->mms_hd, tcpname, URL_RDWR);
525
    if (err)
526
        goto fail;
527

    
528
    mmst->packet_id        = 3;          // default, initial value.
529
    mmst->header_packet_id = 2;          // default, initial value.
530
    err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
531
    if (err)
532
        goto fail;
533
    err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
534
    if (err)
535
        goto fail;
536
    err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
537
    if (err)
538
        goto fail;
539
    err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
540
    if (err)
541
        goto fail;
542
    err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
543
    if (err)
544
        goto fail;
545
    err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER);
546
    if (err)
547
        goto fail;
548
    if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) {
549
        av_log(NULL, AV_LOG_ERROR,
550
               "The server does not support MMST (try MMSH or RTSP)\n");
551
        err = AVERROR_NOFMT;
552
        goto fail;
553
    }
554
    err = ff_mms_asf_header_parser(mms);
555
    if (err) {
556
        av_dlog(NULL, "asf header parsed failed!\n");
557
        goto fail;
558
    }
559
    mms->header_parsed = 1;
560

    
561
    if (!mms->asf_packet_len || !mms->stream_num)
562
        goto fail;
563

    
564
    clear_stream_buffers(mms);
565
    err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
566
    if (err)
567
        goto fail;
568
    // send media packet request
569
    err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
570
    if (err) {
571
        goto fail;
572
    }
573
    av_dlog(NULL, "Leaving open (success)\n");
574
    return 0;
575
fail:
576
    mms_close(h);
577
    av_dlog(NULL, "Leaving open (failure: %d)\n", err);
578
    return err;
579
}
580

    
581
/** Read ASF data through the protocol. */
582
static int mms_read(URLContext *h, uint8_t *buf, int size)
583
{
584
    /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
585
    MMSTContext *mmst = h->priv_data;
586
    MMSContext *mms   = &mmst->mms;
587
    int result = 0;
588

    
589
    do {
590
        if(mms->asf_header_read_size < mms->asf_header_size) {
591
            /* Read from ASF header buffer */
592
            result = ff_mms_read_header(mms, buf, size);
593
        } else if(mms->remaining_in_len) {
594
            /* Read remaining packet data to buffer.
595
             * the result can not be zero because remaining_in_len is positive.*/
596
            result = ff_mms_read_data(mms, buf, size);
597
        } else {
598
            /* Read from network */
599
            int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA);
600
            if (err == 0) {
601
                if(mms->remaining_in_len>mms->asf_packet_len) {
602
                    av_log(NULL, AV_LOG_ERROR,
603
                           "Incoming pktlen %d is larger than ASF pktsize %d\n",
604
                           mms->remaining_in_len, mms->asf_packet_len);
605
                    result= AVERROR_IO;
606
                } else {
607
                    // copy the data to the packet buffer.
608
                    result = ff_mms_read_data(mms, buf, size);
609
                    if (result == 0) {
610
                        av_dlog(NULL, "read asf media paket size is zero!\n");
611
                        break;
612
                    }
613
                }
614
            } else {
615
                av_dlog(NULL, "read packet error!\n");
616
                break;
617
            }
618
        }
619
    } while(!result); // only return one packet.
620
    return result;
621
}
622

    
623
URLProtocol ff_mmst_protocol = {
624
    "mmst",
625
    mms_open,
626
    mms_read,
627
    NULL, // write
628
    NULL, // seek
629
    mms_close,
630
};