FFmpeg: libavformat/mmsh.c Source File

FFmpeg
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,
52   CHUNK_TYPE_ASF_HEADER = 0x4824,
53   CHUNK_TYPE_END = 0x4524,
54   CHUNK_TYPE_STREAM_CHANGE = 0x4324,
55 } ChunkType;
56 
57  typedef struct MMSHContext {
58   MMSContext mms;
59   uint8_t location[1024];
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 
75  static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
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:
93  case CHUNK_TYPE_STREAM_CHANGE:
94  ext_header_len = 4;
95  break;
96  case CHUNK_TYPE_ASF_HEADER:
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)) {
121  av_log(NULL, AV_LOG_ERROR,
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) {
133  av_log(NULL, AV_LOG_ERROR,
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 
144  static int get_http_header_data(MMSHContext *mmsh)
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) {
173  av_log(NULL, AV_LOG_ERROR,
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) {
180  av_log(NULL, AV_LOG_ERROR,
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)) {
196  av_log(NULL, AV_LOG_ERROR,
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  if (!mms->mms_hd->protocol_whitelist && h->protocol_whitelist) {
250  mms->mms_hd->protocol_whitelist = av_strdup(h->protocol_whitelist);
251  if (!mms->mms_hd->protocol_whitelist) {
252  err = AVERROR(ENOMEM);
253  goto fail;
254  }
255  }
256 
257  err = ffurl_connect(mms->mms_hd, NULL);
258  if (err) {
259  goto fail;
260  }
261  err = get_http_header_data(mmsh);
262  if (err) {
263  av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
264  goto fail;
265  }
266 
267  // close the socket and then reopen it for sending the second play request.
268  ffurl_close(mms->mms_hd);
269  memset(headers, 0, sizeof(headers));
270  if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
271  &h->interrupt_callback)) < 0) {
272  goto fail;
273  }
274  stream_selection = av_mallocz(mms->stream_num * 19 + 1);
275  if (!stream_selection)
276  return AVERROR(ENOMEM);
277  for (i = 0; i < mms->stream_num; i++) {
278  char tmp[20];
279  err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
280  if (err < 0)
281  goto fail;
282  av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
283  }
284  // send play request
285  err = snprintf(headers, sizeof(headers),
286  "Accept: */*\r\n"
287  USERAGENT
288  "Host: %s:%d\r\n"
289  "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
290  "Pragma: xPlayStrm=1\r\n"
291  CLIENTGUID
292  "Pragma: stream-switch-count=%d\r\n"
293  "Pragma: stream-switch-entry=%s\r\n"
294  "Pragma: no-cache,rate=1.000000,stream-time=%u"
295  "Connection: Close\r\n",
296  host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
297  av_freep(&stream_selection);
298  if (err < 0) {
299  av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
300  goto fail;
301  }
302  av_log(NULL, AV_LOG_TRACE, "out_buffer is %s", headers);
303  av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
304 
305  err = ffurl_connect(mms->mms_hd, NULL);
306  if (err) {
307  goto fail;
308  }
309 
310  err = get_http_header_data(mmsh);
311  if (err) {
312  av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
313  goto fail;
314  }
315 
316  av_log(NULL, AV_LOG_TRACE, "Connection successfully open\n");
317  return 0;
318 fail:
319  av_freep(&stream_selection);
320  mmsh_close(h);
321  av_log(NULL, AV_LOG_TRACE, "Connection failed with error %d\n", err);
322  return err;
323 }
324 
325  static int mmsh_open(URLContext *h, const char *uri, int flags)
326 {
327  return mmsh_open_internal(h, uri, flags, 0, 0);
328 }
329 
330  static int handle_chunk_type(MMSHContext *mmsh)
331 {
332  MMSContext *mms = &mmsh->mms;
333  int res, len = 0;
334  ChunkType chunk_type;
335  chunk_type = get_chunk_header(mmsh, &len);
336 
337  switch (chunk_type) {
338  case CHUNK_TYPE_END:
339  mmsh->chunk_seq = 0;
340  av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
341  return AVERROR(EIO);
342  case CHUNK_TYPE_STREAM_CHANGE:
343  mms->header_parsed = 0;
344  if (res = get_http_header_data(mmsh)) {
345  av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
346  return res;
347  }
348  break;
349  case CHUNK_TYPE_DATA:
350  return read_data_packet(mmsh, len);
351  default:
352  av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
353  return AVERROR_INVALIDDATA;
354  }
355  return 0;
356 }
357 
358  static int mmsh_read(URLContext *h, uint8_t *buf, int size)
359 {
360  int res = 0;
361  MMSHContext *mmsh = h->priv_data;
362  MMSContext *mms = &mmsh->mms;
363  do {
364  if (mms->asf_header_read_size < mms->asf_header_size) {
365  // copy asf header into buffer
366  res = ff_mms_read_header(mms, buf, size);
367  } else {
368  if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
369  return res;
370  res = ff_mms_read_data(mms, buf, size);
371  }
372  } while (!res);
373  return res;
374 }
375 
376  static int64_t mmsh_read_seek(URLContext *h, int stream_index,
377  int64_t timestamp, int flags)
378 {
379  MMSHContext *mmsh_old = h->priv_data;
380  MMSHContext *mmsh = av_mallocz(sizeof(*mmsh));
381  int ret;
382 
383  if (!mmsh)
384  return AVERROR(ENOMEM);
385 
386  h->priv_data = mmsh;
387  ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0);
388  if(ret>=0){
389  h->priv_data = mmsh_old;
390  mmsh_close(h);
391  h->priv_data = mmsh;
392  av_free(mmsh_old);
393  mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size;
394  }else {
395  h->priv_data = mmsh_old;
396  av_free(mmsh);
397  }
398 
399  return ret;
400 }
401 
402  static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
403 {
404  MMSHContext *mmsh = h->priv_data;
405  MMSContext *mms = &mmsh->mms;
406 
407  if(pos == 0 && whence == SEEK_CUR)
408  return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
409  return AVERROR(ENOSYS);
410 }
411 
412  const URLProtocol ff_mmsh_protocol = {
413  .name = "mmsh",
414  .url_open = mmsh_open,
415  .url_read = mmsh_read,
416  .url_seek = mmsh_seek,
417  .url_close = mmsh_close,
418  .url_read_seek = mmsh_read_seek,
419  .priv_data_size = sizeof(MMSHContext),
420  .flags = URL_PROTOCOL_FLAG_NETWORK,
421  .default_whitelist = "http,tcp",
422 };
mmsh_open
static int mmsh_open(URLContext *h, const char *uri, int flags)
Definition: mmsh.c:325
av_url_split
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:4700
NULL
#define NULL
Definition: coverity.c:32
MMSHContext::request_seq
int request_seq
request packet sequence
Definition: mmsh.c:60
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
MMSContext::mms_hd
URLContext * mms_hd
TCP connection handle.
Definition: mms.h:31
URL_PROTOCOL_FLAG_NETWORK
#define URL_PROTOCOL_FLAG_NETWORK
Definition: url.h:34
h
h
Definition: vp9dsp_template.c:2038
MMSContext::read_in_ptr
uint8_t * read_in_ptr
Pointer for reading from incoming buffer.
Definition: mms.h:43
ChunkType
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Definition: g2meet.c:47
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static int get_http_header_data(MMSHContext *mmsh)
Definition: mmsh.c:144
URLContext::is_streamed
int is_streamed
true if streamed (no seek possible), default = false
Definition: url.h:45
ffurl_connect
int ffurl_connect(URLContext *uc, AVDictionary **options)
Connect an URLContext that has been allocated by ffurl_alloc.
Definition: avio.c:166
URLContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Definition: url.h:47
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Definition: mms.h:30
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static int read_data_packet(MMSHContext *mmsh, const int len)
Definition: mmsh.c:116
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#define EXT_HEADER_LENGTH
Definition: mmsh.c:39
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:654
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int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size)
Definition: mms.c:29
MMSContext::stream_num
int stream_num
stream numbers.
Definition: mms.h:56
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void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
MMSContext::header_parsed
int header_parsed
The header has been received and parsed.
Definition: mms.h:51
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static int handle_chunk_type(MMSHContext *mmsh)
Definition: mmsh.c:330
MMSContext::asf_header
uint8_t * asf_header
Internal handling of the ASF header.
Definition: mms.h:49
uint8_t
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Definition: audio_convert.c:194
opt.h
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AV_LOG_TRACE
#define AV_LOG_TRACE
Extremely verbose debugging, useful for libav* development.
Definition: log.h:202
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static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
Definition: mmsh.c:402
ff_mms_read_data
int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size)
Definition: mms.c:44
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int asf_packet_len
Definition: mms.h:52
flags
static int flags
Definition: log.c:55
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#define CHUNK_HEADER_LENGTH
Definition: mmsh.c:38
size
ptrdiff_t size
Definition: opengl_enc.c:101
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#define av_log(a,...)
Definition: tableprint_vlc.h:28
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uint8_t in_buffer[65536]
Buffer for incoming packets.
Definition: mms.h:42
MMSHContext::mms
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Definition: mmsh.c:58
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int ffurl_alloc(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb)
Create a URLContext for accessing to the resource indicated by url, but do not initiate the connectio...
Definition: avio.c:290
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Definition: mmsh.c:57
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#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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const char * protocol_whitelist
Definition: url.h:49
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#define AVERROR(e)
Definition: error.h:43
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static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
Definition: mmsh.c:75
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#define FFMAX(a, b)
Definition: common.h:94
av_strlcpy
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
fail
#define fail()
Definition: checkasm.h:116
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uint8_t location[1024]
Definition: mmsh.c:59
MMSContext::asf_header_read_size
int asf_header_read_size
Definition: mms.h:53
ChunkType
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Definition: mmsh.c:50
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int ffurl_closep(URLContext **hh)
Close the resource accessed by the URLContext h, and free the memory used by it.
Definition: avio.c:444
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int ff_url_join(char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)
Definition: url.c:36
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char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
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int remaining_in_len
Reading length from incoming buffer.
Definition: mms.h:44
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Definition: url.h:54
buf
void * buf
Definition: avisynth_c.h:690
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Definition: url.h:38
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void * priv_data
Definition: url.h:41
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static int64_t mmsh_read_seek(URLContext *h, int stream_index, int64_t timestamp, int flags)
Definition: mmsh.c:376
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static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
Definition: mmsh.c:214
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#define snprintf
Definition: snprintf.h:34
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int chunk_seq
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Definition: mmsh.c:61
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size_t av_strlcat(char *dst, const char *src, size_t size)
Append the string src to the string dst, but to a total length of no more than size - 1 bytes...
Definition: avstring.c:93
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Definition: url.h:55
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#define SIZE_SPECIFIER
Definition: internal.h:262
MMSContext::asf_header_size
int asf_header_size
Size of stored ASF header.
Definition: mms.h:50
ffurl_close
int ffurl_close(URLContext *h)
Definition: avio.c:467
USERAGENT
#define USERAGENT
Definition: mmsh.c:42
if
if(ret< 0)
Definition: vf_mcdeint.c:279
ffurl_read_complete
int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
Read as many bytes as possible (up to size), calling the read function multiple times if necessary...
Definition: avio.c:414
ff_mmsh_protocol
const URLProtocol ff_mmsh_protocol
Definition: mmsh.c:412
mmsh_close
static int mmsh_close(URLContext *h)
Definition: mmsh.c:64
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
MMSStream::id
int id
Definition: mms.h:27
len
int len
Definition: vorbis_enc_data.h:452
CLIENTGUID
#define CLIENTGUID
Definition: mmsh.c:45
MMSContext::streams
MMSStream * streams
Definition: mms.h:32
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
mmsh_read
static int mmsh_read(URLContext *h, uint8_t *buf, int size)
Definition: mmsh.c:358
url.h
unbuffered private I/O API
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
av_opt_set
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
Definition: opt.c:449
ff_mms_asf_header_parser
int ff_mms_asf_header_parser(MMSContext *mms)
Definition: mms.c:54
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:26
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