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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 { | |
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_dlog(NULL, "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_dlog(NULL, "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_dlog(NULL, "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_dlog(NULL, "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_dlog(NULL, "Connection successfully open\n"); | |
309 | return 0; | |
310 | fail: | |
311 | av_freep(&stream_selection); | |
312 | mmsh_close(h); | |
313 | av_dlog(NULL, "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 | ||
322 | static int handle_chunk_type(MMSHContext *mmsh) | |
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); | |
334 | case CHUNK_TYPE_STREAM_CHANGE: | |
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); | |
385 | mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size; | |
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 | ||
404 | URLProtocol ff_mmsh_protocol = { | |
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), | |
412 | .flags = URL_PROTOCOL_FLAG_NETWORK, | |
413 | }; |