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mmsh.c
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1 /*
2  * MMS protocol over HTTP
3  * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /*
23  * Reference
24  * Windows Media HTTP Streaming Protocol.
25  * http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
26  */
27 
28 #include <string.h>
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/opt.h"
32 #include "internal.h"
33 #include "mms.h"
34 #include "asf.h"
35 #include "http.h"
36 #include "url.h"
37 
38 #define CHUNK_HEADER_LENGTH 4 // 2bytes chunk type and 2bytes chunk length.
39 #define EXT_HEADER_LENGTH 8 // 4bytes sequence, 2bytes useless and 2bytes chunk length.
40 
41 // see Ref 2.2.1.8
42 #define USERAGENT "User-Agent: NSPlayer/4.1.0.3856\r\n"
43 // see Ref 2.2.1.4.33
44 // the guid value can be changed to any valid value.
45 #define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
46 
47 // see Ref 2.2.3 for packet type define:
48 // chunk type contains 2 fields: Frame and PacketID.
49 // Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
50 typedef enum {
51  CHUNK_TYPE_DATA = 0x4424,
53  CHUNK_TYPE_END = 0x4524,
55 } ChunkType;
56 
57 typedef struct MMSHContext {
60  int request_seq; ///< request packet sequence
61  int chunk_seq; ///< data packet sequence
62 } MMSHContext;
63 
64 static int mmsh_close(URLContext *h)
65 {
66  MMSHContext *mmsh = (MMSHContext *)h->priv_data;
67  MMSContext *mms = &mmsh->mms;
68  if (mms->mms_hd)
69  ffurl_closep(&mms->mms_hd);
70  av_freep(&mms->streams);
71  av_freep(&mms->asf_header);
72  return 0;
73 }
74 
76 {
77  MMSContext *mms = &mmsh->mms;
78  uint8_t chunk_header[CHUNK_HEADER_LENGTH];
79  uint8_t ext_header[EXT_HEADER_LENGTH];
80  ChunkType chunk_type;
81  int chunk_len, res, ext_header_len;
82 
83  res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
84  if (res != CHUNK_HEADER_LENGTH) {
85  av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
86  return AVERROR(EIO);
87  }
88  chunk_type = AV_RL16(chunk_header);
89  chunk_len = AV_RL16(chunk_header + 2);
90 
91  switch (chunk_type) {
92  case CHUNK_TYPE_END:
94  ext_header_len = 4;
95  break;
97  case CHUNK_TYPE_DATA:
98  ext_header_len = 8;
99  break;
100  default:
101  av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
102  return AVERROR_INVALIDDATA;
103  }
104 
105  res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
106  if (res != ext_header_len) {
107  av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
108  return AVERROR(EIO);
109  }
110  *len = chunk_len - ext_header_len;
111  if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
112  mmsh->chunk_seq = AV_RL32(ext_header);
113  return chunk_type;
114 }
115 
116 static int read_data_packet(MMSHContext *mmsh, const int len)
117 {
118  MMSContext *mms = &mmsh->mms;
119  int res;
120  if (len > sizeof(mms->in_buffer)) {
122  "Data packet length %d exceeds the in_buffer size %"SIZE_SPECIFIER"\n",
123  len, sizeof(mms->in_buffer));
124  return AVERROR(EIO);
125  }
126  res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
127  av_log(NULL, AV_LOG_TRACE, "Data packet len = %d\n", len);
128  if (res != len) {
129  av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
130  return AVERROR(EIO);
131  }
132  if (len > mms->asf_packet_len) {
134  "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
135  return AVERROR_INVALIDDATA;
136  } else {
137  memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
138  }
139  mms->read_in_ptr = mms->in_buffer;
140  mms->remaining_in_len = mms->asf_packet_len;
141  return 0;
142 }
143 
145 {
146  MMSContext *mms = &mmsh->mms;
147  int res, len;
148  ChunkType chunk_type;
149 
150  for (;;) {
151  len = 0;
152  res = chunk_type = get_chunk_header(mmsh, &len);
153  if (res < 0) {
154  return res;
155  } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
156  // get asf header and stored it
157  if (!mms->header_parsed) {
158  if (mms->asf_header) {
159  if (len != mms->asf_header_size) {
160  mms->asf_header_size = len;
161  av_log(NULL, AV_LOG_TRACE, "Header len changed from %d to %d\n",
162  mms->asf_header_size, len);
163  av_freep(&mms->asf_header);
164  }
165  }
166  mms->asf_header = av_mallocz(len);
167  if (!mms->asf_header) {
168  return AVERROR(ENOMEM);
169  }
170  mms->asf_header_size = len;
171  }
172  if (len > mms->asf_header_size) {
174  "Asf header packet len = %d exceed the asf header buf size %d\n",
175  len, mms->asf_header_size);
176  return AVERROR(EIO);
177  }
178  res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
179  if (res != len) {
181  "Recv asf header data len %d != expected len %d\n", res, len);
182  return AVERROR(EIO);
183  }
184  mms->asf_header_size = len;
185  if (!mms->header_parsed) {
186  res = ff_mms_asf_header_parser(mms);
187  mms->header_parsed = 1;
188  return res;
189  }
190  } else if (chunk_type == CHUNK_TYPE_DATA) {
191  // read data packet and do padding
192  return read_data_packet(mmsh, len);
193  } else {
194  if (len) {
195  if (len > sizeof(mms->in_buffer)) {
197  "Other packet len = %d exceed the in_buffer size %"SIZE_SPECIFIER"\n",
198  len, sizeof(mms->in_buffer));
199  return AVERROR(EIO);
200  }
201  res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
202  if (res != len) {
203  av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
204  return AVERROR(EIO);
205  } else {
206  av_log(NULL, AV_LOG_TRACE, "Skip chunk type %d \n", chunk_type);
207  continue;
208  }
209  }
210  }
211  }
212 }
213 
214 static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
215 {
216  int i, port, err;
217  char httpname[256], path[256], host[128];
218  char *stream_selection = NULL;
219  char headers[1024];
220  MMSHContext *mmsh = h->priv_data;
221  MMSContext *mms;
222 
223  mmsh->request_seq = h->is_streamed = 1;
224  mms = &mmsh->mms;
225  av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
226 
227  av_url_split(NULL, 0, NULL, 0,
228  host, sizeof(host), &port, path, sizeof(path), mmsh->location);
229  if (port<0)
230  port = 80; // default mmsh protocol port
231  ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
232 
233  if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
234  &h->interrupt_callback) < 0) {
235  return AVERROR(EIO);
236  }
237 
238  snprintf(headers, sizeof(headers),
239  "Accept: */*\r\n"
240  USERAGENT
241  "Host: %s:%d\r\n"
242  "Pragma: no-cache,rate=1.000000,stream-time=0,"
243  "stream-offset=0:0,request-context=%u,max-duration=0\r\n"
244  CLIENTGUID
245  "Connection: Close\r\n",
246  host, port, mmsh->request_seq++);
247  av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
248 
249  err = ffurl_connect(mms->mms_hd, NULL);
250  if (err) {
251  goto fail;
252  }
253  err = get_http_header_data(mmsh);
254  if (err) {
255  av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
256  goto fail;
257  }
258 
259  // close the socket and then reopen it for sending the second play request.
260  ffurl_close(mms->mms_hd);
261  memset(headers, 0, sizeof(headers));
262  if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
263  &h->interrupt_callback)) < 0) {
264  goto fail;
265  }
266  stream_selection = av_mallocz(mms->stream_num * 19 + 1);
267  if (!stream_selection)
268  return AVERROR(ENOMEM);
269  for (i = 0; i < mms->stream_num; i++) {
270  char tmp[20];
271  err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
272  if (err < 0)
273  goto fail;
274  av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
275  }
276  // send play request
277  err = snprintf(headers, sizeof(headers),
278  "Accept: */*\r\n"
279  USERAGENT
280  "Host: %s:%d\r\n"
281  "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
282  "Pragma: xPlayStrm=1\r\n"
283  CLIENTGUID
284  "Pragma: stream-switch-count=%d\r\n"
285  "Pragma: stream-switch-entry=%s\r\n"
286  "Pragma: no-cache,rate=1.000000,stream-time=%u"
287  "Connection: Close\r\n",
288  host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
289  av_freep(&stream_selection);
290  if (err < 0) {
291  av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
292  goto fail;
293  }
294  av_log(NULL, AV_LOG_TRACE, "out_buffer is %s", headers);
295  av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
296 
297  err = ffurl_connect(mms->mms_hd, NULL);
298  if (err) {
299  goto fail;
300  }
301 
302  err = get_http_header_data(mmsh);
303  if (err) {
304  av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
305  goto fail;
306  }
307 
308  av_log(NULL, AV_LOG_TRACE, "Connection successfully open\n");
309  return 0;
310 fail:
311  av_freep(&stream_selection);
312  mmsh_close(h);
313  av_log(NULL, AV_LOG_TRACE, "Connection failed with error %d\n", err);
314  return err;
315 }
316 
317 static int mmsh_open(URLContext *h, const char *uri, int flags)
318 {
319  return mmsh_open_internal(h, uri, flags, 0, 0);
320 }
321 
323 {
324  MMSContext *mms = &mmsh->mms;
325  int res, len = 0;
326  ChunkType chunk_type;
327  chunk_type = get_chunk_header(mmsh, &len);
328 
329  switch (chunk_type) {
330  case CHUNK_TYPE_END:
331  mmsh->chunk_seq = 0;
332  av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
333  return AVERROR(EIO);
335  mms->header_parsed = 0;
336  if (res = get_http_header_data(mmsh)) {
337  av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
338  return res;
339  }
340  break;
341  case CHUNK_TYPE_DATA:
342  return read_data_packet(mmsh, len);
343  default:
344  av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
345  return AVERROR_INVALIDDATA;
346  }
347  return 0;
348 }
349 
350 static int mmsh_read(URLContext *h, uint8_t *buf, int size)
351 {
352  int res = 0;
353  MMSHContext *mmsh = h->priv_data;
354  MMSContext *mms = &mmsh->mms;
355  do {
356  if (mms->asf_header_read_size < mms->asf_header_size) {
357  // copy asf header into buffer
358  res = ff_mms_read_header(mms, buf, size);
359  } else {
360  if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
361  return res;
362  res = ff_mms_read_data(mms, buf, size);
363  }
364  } while (!res);
365  return res;
366 }
367 
368 static int64_t mmsh_read_seek(URLContext *h, int stream_index,
369  int64_t timestamp, int flags)
370 {
371  MMSHContext *mmsh_old = h->priv_data;
372  MMSHContext *mmsh = av_mallocz(sizeof(*mmsh));
373  int ret;
374 
375  if (!mmsh)
376  return AVERROR(ENOMEM);
377 
378  h->priv_data = mmsh;
379  ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0);
380  if(ret>=0){
381  h->priv_data = mmsh_old;
382  mmsh_close(h);
383  h->priv_data = mmsh;
384  av_free(mmsh_old);
386  }else {
387  h->priv_data = mmsh_old;
388  av_free(mmsh);
389  }
390 
391  return ret;
392 }
393 
394 static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
395 {
396  MMSHContext *mmsh = h->priv_data;
397  MMSContext *mms = &mmsh->mms;
398 
399  if(pos == 0 && whence == SEEK_CUR)
400  return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
401  return AVERROR(ENOSYS);
402 }
403 
405  .name = "mmsh",
406  .url_open = mmsh_open,
407  .url_read = mmsh_read,
408  .url_seek = mmsh_seek,
409  .url_close = mmsh_close,
410  .url_read_seek = mmsh_read_seek,
411  .priv_data_size = sizeof(MMSHContext),
413 };