aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/mmsh.c
blob: f8803a551c7f62a22b02f1e598a36de11220c45d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
/*
 * MMS protocol over HTTP
 * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/*
 * Reference
 * Windows Media HTTP Streaming Protocol.
 * http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
 */

#include <string.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "mms.h"
#include "asf.h"
#include "http.h"
#include "url.h"

#define CHUNK_HEADER_LENGTH 4   // 2bytes chunk type and 2bytes chunk length.
#define EXT_HEADER_LENGTH   8   // 4bytes sequence, 2bytes useless and 2bytes chunk length.

// see Ref 2.2.1.8
#define USERAGENT  "User-Agent: NSPlayer/4.1.0.3856\r\n"
// see Ref 2.2.1.4.33
// the guid value can be changed to any valid value.
#define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"

// see Ref 2.2.3 for packet type define:
// chunk type contains 2 fields: Frame and PacketID.
// Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
typedef enum {
    CHUNK_TYPE_DATA          = 0x4424,
    CHUNK_TYPE_ASF_HEADER    = 0x4824,
    CHUNK_TYPE_END           = 0x4524,
    CHUNK_TYPE_STREAM_CHANGE = 0x4324,
} ChunkType;

typedef struct MMSHContext {
    MMSContext mms;
    int request_seq;  ///< request packet sequence
    int chunk_seq;    ///< data packet sequence
} MMSHContext;

static int mmsh_close(URLContext *h)
{
    MMSHContext *mmsh = (MMSHContext *)h->priv_data;
    MMSContext *mms   = &mmsh->mms;
    if (mms->mms_hd)
        ffurl_close(mms->mms_hd);
    av_free(mms->streams);
    av_free(mms->asf_header);
    return 0;
}

static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
{
    MMSContext *mms = &mmsh->mms;
    uint8_t chunk_header[CHUNK_HEADER_LENGTH];
    uint8_t ext_header[EXT_HEADER_LENGTH];
    ChunkType chunk_type;
    int chunk_len, res, ext_header_len;

    res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
    if (res != CHUNK_HEADER_LENGTH) {
        av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
        return AVERROR(EIO);
    }
    chunk_type = AV_RL16(chunk_header);
    chunk_len  = AV_RL16(chunk_header + 2);

    switch (chunk_type) {
    case CHUNK_TYPE_END:
    case CHUNK_TYPE_STREAM_CHANGE:
        ext_header_len = 4;
        break;
    case CHUNK_TYPE_ASF_HEADER:
    case CHUNK_TYPE_DATA:
        ext_header_len = 8;
        break;
    default:
        av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
        return AVERROR_INVALIDDATA;
    }

    res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
    if (res != ext_header_len) {
        av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
        return AVERROR(EIO);
    }
    *len = chunk_len - ext_header_len;
    if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
        mmsh->chunk_seq = AV_RL32(ext_header);
    return chunk_type;
}

static int read_data_packet(MMSHContext *mmsh, const int len)
{
    MMSContext *mms   = &mmsh->mms;
    int res;
    if (len > sizeof(mms->in_buffer)) {
        av_log(NULL, AV_LOG_ERROR,
               "Data packet length %d exceeds the in_buffer size %zu\n",
               len, sizeof(mms->in_buffer));
        return AVERROR(EIO);
    }
    res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
    av_dlog(NULL, "Data packet len = %d\n", len);
    if (res != len) {
        av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
        return AVERROR(EIO);
    }
    if (len > mms->asf_packet_len) {
        av_log(NULL, AV_LOG_ERROR,
               "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
        return AVERROR_INVALIDDATA;
    } else {
        memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
    }
    mms->read_in_ptr      = mms->in_buffer;
    mms->remaining_in_len = mms->asf_packet_len;
    return 0;
}

static int get_http_header_data(MMSHContext *mmsh)
{
    MMSContext *mms = &mmsh->mms;
    int res, len;
    ChunkType chunk_type;

    for (;;) {
        len = 0;
        res = chunk_type = get_chunk_header(mmsh, &len);
        if (res < 0) {
            return res;
        } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
            // get asf header and stored it
            if (!mms->header_parsed) {
                if (mms->asf_header) {
                    if (len != mms->asf_header_size) {
                        mms->asf_header_size = len;
                        av_dlog(NULL, "Header len changed from %d to %d\n",
                                mms->asf_header_size, len);
                        av_freep(&mms->asf_header);
                    }
                }
                mms->asf_header = av_mallocz(len);
                if (!mms->asf_header) {
                    return AVERROR(ENOMEM);
                }
                mms->asf_header_size = len;
            }
            if (len > mms->asf_header_size) {
                av_log(NULL, AV_LOG_ERROR,
                       "Asf header packet len = %d exceed the asf header buf size %d\n",
                       len, mms->asf_header_size);
                return AVERROR(EIO);
            }
            res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
            if (res != len) {
                av_log(NULL, AV_LOG_ERROR,
                       "Recv asf header data len %d != expected len %d\n", res, len);
                return AVERROR(EIO);
            }
            mms->asf_header_size = len;
            if (!mms->header_parsed) {
                res = ff_mms_asf_header_parser(mms);
                mms->header_parsed = 1;
                return res;
            }
        } else if (chunk_type == CHUNK_TYPE_DATA) {
            // read data packet and do padding
            return read_data_packet(mmsh, len);
        } else {
            if (len) {
                if (len > sizeof(mms->in_buffer)) {
                    av_log(NULL, AV_LOG_ERROR,
                           "Other packet len = %d exceed the in_buffer size %zu\n",
                           len, sizeof(mms->in_buffer));
                    return AVERROR(EIO);
                }
                res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
                if (res != len) {
                    av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
                    return AVERROR(EIO);
                } else {
                    av_dlog(NULL, "Skip chunk type %d \n", chunk_type);
                    continue;
                }
            }
        }
    }
}

static int mmsh_open(URLContext *h, const char *uri, int flags)
{
    int i, port, err;
    char httpname[256], path[256], host[128], location[1024];
    char *stream_selection = NULL;
    char headers[1024];
    MMSHContext *mmsh = h->priv_data;
    MMSContext *mms;

    mmsh->request_seq = h->is_streamed = 1;
    mms = &mmsh->mms;
    av_strlcpy(location, uri, sizeof(location));

    av_url_split(NULL, 0, NULL, 0,
        host, sizeof(host), &port, path, sizeof(path), location);
    if (port<0)
        port = 80; // default mmsh protocol port
    ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);

    if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
                    &h->interrupt_callback) < 0) {
        return AVERROR(EIO);
    }

    snprintf(headers, sizeof(headers),
             "Accept: */*\r\n"
             USERAGENT
             "Host: %s:%d\r\n"
             "Pragma: no-cache,rate=1.000000,stream-time=0,"
             "stream-offset=0:0,request-context=%u,max-duration=0\r\n"
             CLIENTGUID
             "Connection: Close\r\n\r\n",
             host, port, mmsh->request_seq++);
    av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);

    err = ffurl_connect(mms->mms_hd, NULL);
    if (err) {
        goto fail;
    }
    err = get_http_header_data(mmsh);
    if (err) {
        av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
        goto fail;
    }

    // close the socket and then reopen it for sending the second play request.
    ffurl_close(mms->mms_hd);
    memset(headers, 0, sizeof(headers));
    if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
                           &h->interrupt_callback)) < 0) {
        goto fail;
    }
    stream_selection = av_mallocz(mms->stream_num * 19 + 1);
    if (!stream_selection)
        return AVERROR(ENOMEM);
    for (i = 0; i < mms->stream_num; i++) {
        char tmp[20];
        err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
        if (err < 0)
            goto fail;
        av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
    }
    // send play request
    err = snprintf(headers, sizeof(headers),
                   "Accept: */*\r\n"
                   USERAGENT
                   "Host: %s:%d\r\n"
                   "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
                   "Pragma: xPlayStrm=1\r\n"
                   CLIENTGUID
                   "Pragma: stream-switch-count=%d\r\n"
                   "Pragma: stream-switch-entry=%s\r\n"
                   "Connection: Close\r\n\r\n",
                   host, port, mmsh->request_seq++, mms->stream_num, stream_selection);
    av_freep(&stream_selection);
    if (err < 0) {
        av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
        goto fail;
    }
    av_dlog(NULL, "out_buffer is %s", headers);
    av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);

    err = ffurl_connect(mms->mms_hd, NULL);
    if (err) {
          goto fail;
    }

    err = get_http_header_data(mmsh);
    if (err) {
        av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
        goto fail;
    }

    av_dlog(NULL, "Connection successfully open\n");
    return 0;
fail:
    av_freep(&stream_selection);
    mmsh_close(h);
    av_dlog(NULL, "Connection failed with error %d\n", err);
    return err;
}

static int handle_chunk_type(MMSHContext *mmsh)
{
    MMSContext *mms = &mmsh->mms;
    int res, len = 0;
    ChunkType chunk_type;
    chunk_type = get_chunk_header(mmsh, &len);

    switch (chunk_type) {
    case CHUNK_TYPE_END:
        mmsh->chunk_seq = 0;
        av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
        return AVERROR(EIO);
    case CHUNK_TYPE_STREAM_CHANGE:
        mms->header_parsed = 0;
        if (res = get_http_header_data(mmsh)) {
            av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
            return res;
        }
        break;
    case CHUNK_TYPE_DATA:
        return read_data_packet(mmsh, len);
    default:
        av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
        return AVERROR_INVALIDDATA;
    }
    return 0;
}

static int mmsh_read(URLContext *h, uint8_t *buf, int size)
{
    int res = 0;
    MMSHContext *mmsh = h->priv_data;
    MMSContext *mms   = &mmsh->mms;
    do {
        if (mms->asf_header_read_size < mms->asf_header_size) {
            // copy asf header into buffer
            res = ff_mms_read_header(mms, buf, size);
        } else {
            if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
                return res;
            res = ff_mms_read_data(mms, buf, size);
        }
    } while (!res);
    return res;
}

URLProtocol ff_mmsh_protocol = {
    .name           = "mmsh",
    .url_open       = mmsh_open,
    .url_read       = mmsh_read,
    .url_close      = mmsh_close,
    .priv_data_size = sizeof(MMSHContext),
    .flags          = URL_PROTOCOL_FLAG_NETWORK,
};