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ffmpeg / libavformat / mmst.c @ e731b8d8

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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

    
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#include "avformat.h"
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#include "mms.h"
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#include "internal.h"
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#include "avio_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"
38

    
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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;
55

    
56
/** Server to client packet types. */
57
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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    /*@}*/
73

    
74
    /** Pseudo packets. */
75
    /*@{*/
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    SC_PKT_CANCEL                   = -1,
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    SC_PKT_NO_DATA                  = -2,
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    /*@}*/
79

    
80
    /** Data packets. */
81
    /*@{*/
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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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    /*@}*/
85
} MMSSCPacketType;
86

    
87
typedef struct {
88
    MMSContext  mms;
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    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.
96
} MMSTContext;
97

    
98
/** Create MMST command packet header */
99
static void start_command_packet(MMSTContext *mmst, MMSCSPacketType packet_type)
100
{
101
    MMSContext *mms    = &mmst->mms;
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    mms->write_out_ptr = mms->out_buffer;
103

    
104
    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
114
}
115

    
116
/** Add prefixes to MMST command packet. */
117
static void insert_command_prefixes(MMSContext *mms,
118
        uint32_t prefix1, uint32_t prefix2)
119
{
120
    bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
121
    bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
122
}
123

    
124
/** Send a prepared MMST command packet. */
125
static int send_command_packet(MMSTContext *mmst)
126
{
127
    MMSContext *mms  = &mmst->mms;
128
    int len= mms->write_out_ptr - mms->out_buffer;
129
    int exact_length = FFALIGN(len, 8);
130
    int first_length= exact_length - 16;
131
    int len8= first_length/8;
132
    int write_result;
133

    
134
    // update packet length fields.
135
    AV_WL32(mms->out_buffer + 8, first_length);
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    AV_WL32(mms->out_buffer + 16, len8);
137
    AV_WL32(mms->out_buffer + 32, len8-2);
138
    memset(mms->write_out_ptr, 0, exact_length - len);
139

    
140
    // write it out.
141
    write_result= url_write(mms->mms_hd, mms->out_buffer, exact_length);
142
    if(write_result != exact_length) {
143
        av_log(NULL, AV_LOG_ERROR,
144
               "Failed to write data of length %d: %d (%s)\n",
145
               exact_length, write_result,
146
               write_result < 0 ? strerror(write_result) :
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                   "The server closed the connection");
148
        return AVERROR_IO;
149
    }
150

    
151
    return 0;
152
}
153

    
154
static void mms_put_utf16(MMSContext *mms, uint8_t *src)
155
{
156
    AVIOContext bic;
157
    int size = mms->write_out_ptr - mms->out_buffer;
158
    int len;
159
    ffio_init_context(&bic, mms->write_out_ptr,
160
            sizeof(mms->out_buffer) - size, 1, NULL, NULL, NULL, NULL);
161

    
162
    len = avio_put_str16le(&bic, src);
163
    mms->write_out_ptr += len;
164
}
165

    
166
static int send_time_test_data(MMSTContext *mmst)
167
{
168
    start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST);
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    insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b);
170
    return send_command_packet(mmst);
171
}
172

    
173
static int send_protocol_select(MMSTContext *mmst)
174
{
175
    char data_string[256];
176
    MMSContext *mms = &mmst->mms;
177

    
178
    start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT);
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    insert_command_prefixes(mms, 0, 0xffffffff);
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    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);
190

    
191
    mms_put_utf16(mms, data_string);
192
    return send_command_packet(mmst);
193
}
194

    
195
static int send_media_file_request(MMSTContext *mmst)
196
{
197
    MMSContext *mms = &mmst->mms;
198
    start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST);
199
    insert_command_prefixes(mms, 1, 0xffffffff);
200
    bytestream_put_le32(&mms->write_out_ptr, 0);
201
    bytestream_put_le32(&mms->write_out_ptr, 0);
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    mms_put_utf16(mms, mmst->path + 1); // +1 for skip "/"
203

    
204
    return send_command_packet(mmst);
205
}
206

    
207
static void handle_packet_stream_changing_type(MMSTContext *mmst)
208
{
209
    MMSContext *mms = &mmst->mms;
210
    av_dlog(NULL, "Stream changing!\n");
211

    
212
    // 40 is the packet header size, 7 is the prefix size.
213
    mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
214
    av_dlog(NULL, "Changed header prefix to 0x%x", mmst->header_packet_id);
215
}
216

    
217
static int send_keepalive_packet(MMSTContext *mmst)
218
{
219
    // respond to a keepalive with a keepalive...
220
    start_command_packet(mmst, CS_PKT_KEEPALIVE);
221
    insert_command_prefixes(&mmst->mms, 1, 0x100FFFF);
222
    return send_command_packet(mmst);
223
}
224

    
225
/** Pad media packets smaller than max_packet_size and/or adjust read position
226
  * after a seek. */
227
static void pad_media_packet(MMSContext *mms)
228
{
229
    if(mms->remaining_in_len<mms->asf_packet_len) {
230
        int padding_size = mms->asf_packet_len - mms->remaining_in_len;
231
        memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
232
        mms->remaining_in_len += padding_size;
233
    }
234
}
235

    
236
/** Read incoming MMST media, header or command packet. */
237
static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
238
{
239
    int read_result;
240
    MMSSCPacketType packet_type= -1;
241
    MMSContext *mms = &mmst->mms;
242
    for(;;) {
243
        read_result = url_read_complete(mms->mms_hd, mms->in_buffer, 8);
244
        if (read_result != 8) {
245
            if(read_result < 0) {
246
                av_log(NULL, AV_LOG_ERROR,
247
                       "Error reading packet header: %d (%s)\n",
248
                       read_result, strerror(read_result));
249
                packet_type = SC_PKT_CANCEL;
250
            } else {
251
                av_log(NULL, AV_LOG_ERROR,
252
                       "The server closed the connection\n");
253
                packet_type = SC_PKT_NO_DATA;
254
            }
255
            return packet_type;
256
        }
257

    
258
        // handle command packet.
259
        if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
260
            int length_remaining, hr;
261

    
262
            mmst->incoming_flags= mms->in_buffer[3];
263
            read_result= url_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
264
            if(read_result != 4) {
265
                av_log(NULL, AV_LOG_ERROR,
266
                       "Reading command packet length failed: %d (%s)\n",
267
                       read_result,
268
                       read_result < 0 ? strerror(read_result) :
269
                           "The server closed the connection");
270
                return read_result < 0 ? read_result : AVERROR_IO;
271
            }
272

    
273
            length_remaining= AV_RL32(mms->in_buffer+8) + 4;
274
            av_dlog(NULL, "Length remaining is %d\n", length_remaining);
275
            // read the rest of the packet.
276
            if (length_remaining < 0
277
                || length_remaining > sizeof(mms->in_buffer) - 12) {
278
                av_log(NULL, AV_LOG_ERROR,
279
                       "Incoming packet length %d exceeds bufsize %zu\n",
280
                       length_remaining, sizeof(mms->in_buffer) - 12);
281
                return AVERROR_INVALIDDATA;
282
            }
283
            read_result = url_read_complete(mms->mms_hd, mms->in_buffer + 12,
284
                                            length_remaining) ;
285
            if (read_result != length_remaining) {
286
                av_log(NULL, AV_LOG_ERROR,
287
                       "Reading pkt data (length=%d) failed: %d (%s)\n",
288
                       length_remaining, read_result,
289
                       read_result < 0 ? strerror(read_result) :
290
                           "The server closed the connection");
291
                return read_result < 0 ? read_result : AVERROR_IO;
292
            }
293
            packet_type= AV_RL16(mms->in_buffer+36);
294
            if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) {
295
                av_log(NULL, AV_LOG_ERROR,
296
                       "Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr);
297
                return AVERROR_UNKNOWN;
298
            }
299
        } else {
300
            int length_remaining;
301
            int packet_id_type;
302
            int tmp;
303

    
304
            // note we cache the first 8 bytes,
305
            // then fill up the buffer with the others
306
            tmp                       = AV_RL16(mms->in_buffer + 6);
307
            length_remaining          = (tmp - 8) & 0xffff;
308
            mmst->incoming_packet_seq = AV_RL32(mms->in_buffer);
309
            packet_id_type            = mms->in_buffer[4];
310
            mmst->incoming_flags      = mms->in_buffer[5];
311

    
312
            if (length_remaining < 0
313
                || length_remaining > sizeof(mms->in_buffer) - 8) {
314
                av_log(NULL, AV_LOG_ERROR,
315
                       "Data length %d is invalid or too large (max=%zu)\n",
316
                       length_remaining, sizeof(mms->in_buffer));
317
                return AVERROR_INVALIDDATA;
318
            }
319
            mms->remaining_in_len    = length_remaining;
320
            mms->read_in_ptr         = mms->in_buffer;
321
            read_result= url_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
322
            if(read_result != length_remaining) {
323
                av_log(NULL, AV_LOG_ERROR,
324
                       "Failed to read packet data of size %d: %d (%s)\n",
325
                       length_remaining, read_result,
326
                       read_result < 0 ? strerror(read_result) :
327
                           "The server closed the connection");
328
                return read_result < 0 ? read_result : AVERROR_IO;
329
            }
330

    
331
            // if we successfully read everything.
332
            if(packet_id_type == mmst->header_packet_id) {
333
                packet_type = SC_PKT_ASF_HEADER;
334
                // Store the asf header
335
                if(!mms->header_parsed) {
336
                    void *p = av_realloc(mms->asf_header,
337
                                  mms->asf_header_size + mms->remaining_in_len);
338
                    if (!p) {
339
                        av_freep(&mms->asf_header);
340
                        return AVERROR(ENOMEM);
341
                    }
342
                    mms->asf_header = p;
343
                    memcpy(mms->asf_header + mms->asf_header_size,
344
                           mms->read_in_ptr, mms->remaining_in_len);
345
                    mms->asf_header_size += mms->remaining_in_len;
346
                }
347
                // 0x04 means asf header is sent in multiple packets.
348
                if (mmst->incoming_flags == 0x04)
349
                    continue;
350
            } else if(packet_id_type == mmst->packet_id) {
351
                packet_type = SC_PKT_ASF_MEDIA;
352
            } else {
353
                av_dlog(NULL, "packet id type %d is old.", packet_id_type);
354
                continue;
355
            }
356
        }
357

    
358
        // preprocess some packet type
359
        if(packet_type == SC_PKT_KEEPALIVE) {
360
            send_keepalive_packet(mmst);
361
            continue;
362
        } else if(packet_type == SC_PKT_STREAM_CHANGING) {
363
            handle_packet_stream_changing_type(mmst);
364
        } else if(packet_type == SC_PKT_ASF_MEDIA) {
365
            pad_media_packet(mms);
366
        }
367
        return packet_type;
368
    }
369
}
370

    
371
static int mms_safe_send_recv(MMSTContext *mmst,
372
                              int (*send_fun)(MMSTContext *mmst),
373
                              const MMSSCPacketType expect_type)
374
{
375
    MMSSCPacketType type;
376
    if(send_fun) {
377
        int ret = send_fun(mmst);
378
        if (ret < 0) {
379
            av_dlog(NULL, "Send Packet error before expecting recv packet %d\n", expect_type);
380
            return ret;
381
        }
382
    }
383

    
384
    if ((type = get_tcp_server_response(mmst)) != expect_type) {
385
        av_log(NULL, AV_LOG_ERROR,
386
               "Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
387
               type, expect_type);
388
        return AVERROR_INVALIDDATA;
389
    } else {
390
        return 0;
391
    }
392
}
393

    
394
static int send_media_header_request(MMSTContext *mmst)
395
{
396
    MMSContext *mms = &mmst->mms;
397
    start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST);
398
    insert_command_prefixes(mms, 1, 0);
399
    bytestream_put_le32(&mms->write_out_ptr, 0);
400
    bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
401
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
402
    bytestream_put_le32(&mms->write_out_ptr, 0);
403
    bytestream_put_le32(&mms->write_out_ptr, 0);
404
    bytestream_put_le32(&mms->write_out_ptr, 0);
405

    
406
    // the media preroll value in milliseconds?
407
    bytestream_put_le32(&mms->write_out_ptr, 0);
408
    bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
409
    bytestream_put_le32(&mms->write_out_ptr, 2);
410
    bytestream_put_le32(&mms->write_out_ptr, 0);
411

    
412
    return send_command_packet(mmst);
413
}
414

    
415
/** Send the initial handshake. */
416
static int send_startup_packet(MMSTContext *mmst)
417
{
418
    char data_string[256];
419
    MMSContext *mms = &mmst->mms;
420
    // SubscriberName is defined in MS specification linked below.
421
    // The guid value can be any valid value.
422
    // http://download.microsoft.com/
423
    // download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
424
    snprintf(data_string, sizeof(data_string),
425
            "NSPlayer/7.0.0.1956; {%s}; Host: %s",
426
            "7E667F5D-A661-495E-A512-F55686DDA178", mmst->host);
427

    
428
    start_command_packet(mmst, CS_PKT_INITIAL);
429
    insert_command_prefixes(mms, 0, 0x0004000b);
430
    bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
431
    mms_put_utf16(mms, data_string);
432
    return send_command_packet(mmst);
433
}
434

    
435
/** Send MMST stream selection command based on the AVStream->discard values. */
436
static int send_stream_selection_request(MMSTContext *mmst)
437
{
438
    int i;
439
    MMSContext *mms = &mmst->mms;
440
    //  send the streams we want back...
441
    start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST);
442
    bytestream_put_le32(&mms->write_out_ptr, mms->stream_num);         // stream nums
443
    for(i= 0; i<mms->stream_num; i++) {
444
        bytestream_put_le16(&mms->write_out_ptr, 0xffff);              // flags
445
        bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id);  // stream id
446
        bytestream_put_le16(&mms->write_out_ptr, 0);                   // selection
447
    }
448
    return send_command_packet(mmst);
449
}
450

    
451
static int send_close_packet(MMSTContext *mmst)
452
{
453
    start_command_packet(mmst, CS_PKT_STREAM_CLOSE);
454
    insert_command_prefixes(&mmst->mms, 1, 1);
455

    
456
    return send_command_packet(mmst);
457
}
458

    
459
/** Close the MMSH/MMST connection */
460
static int mms_close(URLContext *h)
461
{
462
    MMSTContext *mmst = (MMSTContext *)h->priv_data;
463
    MMSContext *mms   = &mmst->mms;
464
    if(mms->mms_hd) {
465
        send_close_packet(mmst);
466
        url_close(mms->mms_hd);
467
    }
468

    
469
    /* free all separately allocated pointers in mms */
470
    av_free(mms->streams);
471
    av_free(mms->asf_header);
472
    av_freep(&h->priv_data);
473

    
474
    return 0;
475
}
476

    
477
static int send_media_packet_request(MMSTContext *mmst)
478
{
479
    MMSContext *mms = &mmst->mms;
480
    start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID);
481
    insert_command_prefixes(mms, 1, 0x0001FFFF);
482
    bytestream_put_le64(&mms->write_out_ptr, 0);          // seek timestamp
483
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
484
    bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
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, 0xff);       // max stream time limit
488
    bytestream_put_byte(&mms->write_out_ptr, 0x00);       // stream time limit flag
489

    
490
    mmst->packet_id++;                                     // new packet_id
491
    bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id);
492
    return send_command_packet(mmst);
493
}
494

    
495

    
496
static void clear_stream_buffers(MMSContext *mms)
497
{
498
    mms->remaining_in_len = 0;
499
    mms->read_in_ptr      = mms->in_buffer;
500
}
501

    
502
static int mms_open(URLContext *h, const char *uri, int flags)
503
{
504
    MMSTContext *mmst;
505
    MMSContext *mms;
506
    int port, err;
507
    char tcpname[256];
508

    
509
    h->is_streamed = 1;
510
    mmst = h->priv_data = av_mallocz(sizeof(MMSTContext));
511
    if (!h->priv_data)
512
        return AVERROR(ENOMEM);
513
    mms = &mmst->mms;
514

    
515
    // only for MMS over TCP, so set proto = NULL
516
    av_url_split(NULL, 0, NULL, 0,
517
            mmst->host, sizeof(mmst->host), &port, mmst->path,
518
            sizeof(mmst->path), uri);
519

    
520
    if(port<0)
521
        port = 1755; // defaut mms protocol port
522

    
523
    // establish tcp connection.
524
    ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL);
525
    err = url_open(&mms->mms_hd, tcpname, URL_RDWR);
526
    if (err)
527
        goto fail;
528

    
529
    mmst->packet_id        = 3;          // default, initial value.
530
    mmst->header_packet_id = 2;          // default, initial value.
531
    err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
532
    if (err)
533
        goto fail;
534
    err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
535
    if (err)
536
        goto fail;
537
    err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
538
    if (err)
539
        goto fail;
540
    err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
541
    if (err)
542
        goto fail;
543
    err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
544
    if (err)
545
        goto fail;
546
    err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER);
547
    if (err)
548
        goto fail;
549
    if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) {
550
        av_log(NULL, AV_LOG_ERROR,
551
               "The server does not support MMST (try MMSH or RTSP)\n");
552
        err = AVERROR_NOFMT;
553
        goto fail;
554
    }
555
    err = ff_mms_asf_header_parser(mms);
556
    if (err) {
557
        av_dlog(NULL, "asf header parsed failed!\n");
558
        goto fail;
559
    }
560
    mms->header_parsed = 1;
561

    
562
    if (!mms->asf_packet_len || !mms->stream_num)
563
        goto fail;
564

    
565
    clear_stream_buffers(mms);
566
    err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
567
    if (err)
568
        goto fail;
569
    // send media packet request
570
    err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
571
    if (err) {
572
        goto fail;
573
    }
574
    av_dlog(NULL, "Leaving open (success)\n");
575
    return 0;
576
fail:
577
    mms_close(h);
578
    av_dlog(NULL, "Leaving open (failure: %d)\n", err);
579
    return err;
580
}
581

    
582
/** Read ASF data through the protocol. */
583
static int mms_read(URLContext *h, uint8_t *buf, int size)
584
{
585
    /* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
586
    MMSTContext *mmst = h->priv_data;
587
    MMSContext *mms   = &mmst->mms;
588
    int result = 0;
589

    
590
    do {
591
        if(mms->asf_header_read_size < mms->asf_header_size) {
592
            /* Read from ASF header buffer */
593
            result = ff_mms_read_header(mms, buf, size);
594
        } else if(mms->remaining_in_len) {
595
            /* Read remaining packet data to buffer.
596
             * the result can not be zero because remaining_in_len is positive.*/
597
            result = ff_mms_read_data(mms, buf, size);
598
        } else {
599
            /* Read from network */
600
            int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA);
601
            if (err == 0) {
602
                if(mms->remaining_in_len>mms->asf_packet_len) {
603
                    av_log(NULL, AV_LOG_ERROR,
604
                           "Incoming pktlen %d is larger than ASF pktsize %d\n",
605
                           mms->remaining_in_len, mms->asf_packet_len);
606
                    result= AVERROR_IO;
607
                } else {
608
                    // copy the data to the packet buffer.
609
                    result = ff_mms_read_data(mms, buf, size);
610
                    if (result == 0) {
611
                        av_dlog(NULL, "read asf media paket size is zero!\n");
612
                        break;
613
                    }
614
                }
615
            } else {
616
                av_dlog(NULL, "read packet error!\n");
617
                break;
618
            }
619
        }
620
    } while(!result); // only return one packet.
621
    return result;
622
}
623

    
624
URLProtocol ff_mmst_protocol = {
625
    "mmst",
626
    mms_open,
627
    mms_read,
628
    NULL, // write
629
    NULL, // seek
630
    mms_close,
631
};