FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/mmsh.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 0 211 0.0%
Functions: 0 10 0.0%
Branches: 0 93 0.0%

Line Branch Exec Source
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 "http.h"
35 #include "url.h"
36
37 #define CHUNK_HEADER_LENGTH 4 // 2bytes chunk type and 2bytes chunk length.
38 #define EXT_HEADER_LENGTH 8 // 4bytes sequence, 2bytes useless and 2bytes chunk length.
39
40 // see Ref 2.2.1.8
41 #define USERAGENT "User-Agent: NSPlayer/4.1.0.3856\r\n"
42 // see Ref 2.2.1.4.33
43 // the GUID value can be changed to any valid value.
44 #define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
45
46 // see Ref 2.2.3 for packet type define:
47 // chunk type contains 2 fields: Frame and PacketID.
48 // Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
49 typedef enum {
50 CHUNK_TYPE_DATA = 0x4424,
51 CHUNK_TYPE_ASF_HEADER = 0x4824,
52 CHUNK_TYPE_END = 0x4524,
53 CHUNK_TYPE_STREAM_CHANGE = 0x4324,
54 } ChunkType;
55
56 typedef struct MMSHContext {
57 MMSContext mms;
58 uint8_t location[1024];
59 int request_seq; ///< request packet sequence
60 int chunk_seq; ///< data packet sequence
61 } MMSHContext;
62
63 static int mmsh_close(URLContext *h)
64 {
65 MMSHContext *mmsh = (MMSHContext *)h->priv_data;
66 MMSContext *mms = &mmsh->mms;
67 ffurl_closep(&mms->mms_hd);
68 av_freep(&mms->streams);
69 av_freep(&mms->asf_header);
70 return 0;
71 }
72
73 static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
74 {
75 MMSContext *mms = &mmsh->mms;
76 uint8_t chunk_header[CHUNK_HEADER_LENGTH];
77 uint8_t ext_header[EXT_HEADER_LENGTH];
78 ChunkType chunk_type;
79 int chunk_len, res, ext_header_len;
80
81 res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
82 if (res != CHUNK_HEADER_LENGTH) {
83 av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
84 return AVERROR(EIO);
85 }
86 chunk_type = AV_RL16(chunk_header);
87 chunk_len = AV_RL16(chunk_header + 2);
88
89 switch (chunk_type) {
90 case CHUNK_TYPE_END:
91 case CHUNK_TYPE_STREAM_CHANGE:
92 ext_header_len = 4;
93 break;
94 case CHUNK_TYPE_ASF_HEADER:
95 case CHUNK_TYPE_DATA:
96 ext_header_len = 8;
97 break;
98 default:
99 av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
100 return AVERROR_INVALIDDATA;
101 }
102
103 res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
104 if (res != ext_header_len) {
105 av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
106 return AVERROR(EIO);
107 }
108 *len = chunk_len - ext_header_len;
109 if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
110 mmsh->chunk_seq = AV_RL32(ext_header);
111 return chunk_type;
112 }
113
114 static int read_data_packet(MMSHContext *mmsh, const int len)
115 {
116 MMSContext *mms = &mmsh->mms;
117 int res;
118 if (len > sizeof(mms->in_buffer)) {
119 av_log(NULL, AV_LOG_ERROR,
120 "Data packet length %d exceeds the in_buffer size %"SIZE_SPECIFIER"\n",
121 len, sizeof(mms->in_buffer));
122 return AVERROR(EIO);
123 }
124 res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
125 av_log(NULL, AV_LOG_TRACE, "Data packet len = %d\n", len);
126 if (res != len) {
127 av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
128 return AVERROR(EIO);
129 }
130 if (len > mms->asf_packet_len) {
131 av_log(NULL, AV_LOG_ERROR,
132 "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
133 return AVERROR_INVALIDDATA;
134 } else {
135 memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
136 }
137 mms->read_in_ptr = mms->in_buffer;
138 mms->remaining_in_len = mms->asf_packet_len;
139 return 0;
140 }
141
142 static int get_http_header_data(MMSHContext *mmsh)
143 {
144 MMSContext *mms = &mmsh->mms;
145 int res, len;
146 ChunkType chunk_type;
147
148 for (;;) {
149 len = 0;
150 res = chunk_type = get_chunk_header(mmsh, &len);
151 if (res < 0) {
152 return res;
153 } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
154 // get asf header and stored it
155 if (!mms->header_parsed) {
156 if (mms->asf_header) {
157 if (len != mms->asf_header_size) {
158 mms->asf_header_size = len;
159 av_log(NULL, AV_LOG_TRACE, "Header len changed from %d to %d\n",
160 mms->asf_header_size, len);
161 av_freep(&mms->asf_header);
162 }
163 }
164 mms->asf_header = av_mallocz(len);
165 if (!mms->asf_header) {
166 return AVERROR(ENOMEM);
167 }
168 mms->asf_header_size = len;
169 }
170 if (len > mms->asf_header_size) {
171 av_log(NULL, AV_LOG_ERROR,
172 "Asf header packet len = %d exceed the asf header buf size %d\n",
173 len, mms->asf_header_size);
174 return AVERROR(EIO);
175 }
176 res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
177 if (res != len) {
178 av_log(NULL, AV_LOG_ERROR,
179 "Recv asf header data len %d != expected len %d\n", res, len);
180 return AVERROR(EIO);
181 }
182 mms->asf_header_size = len;
183 if (!mms->header_parsed) {
184 res = ff_mms_asf_header_parser(mms);
185 mms->header_parsed = 1;
186 return res;
187 }
188 } else if (chunk_type == CHUNK_TYPE_DATA) {
189 // read data packet and do padding
190 return read_data_packet(mmsh, len);
191 } else {
192 if (len) {
193 if (len > sizeof(mms->in_buffer)) {
194 av_log(NULL, AV_LOG_ERROR,
195 "Other packet len = %d exceed the in_buffer size %"SIZE_SPECIFIER"\n",
196 len, sizeof(mms->in_buffer));
197 return AVERROR(EIO);
198 }
199 res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
200 if (res != len) {
201 av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
202 return AVERROR(EIO);
203 } else {
204 av_log(NULL, AV_LOG_TRACE, "Skip chunk type %d \n", chunk_type);
205 continue;
206 }
207 }
208 }
209 }
210 }
211
212 static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
213 {
214 int i, port, err;
215 char httpname[256], path[256], host[128];
216 char *stream_selection = NULL;
217 char headers[1024];
218 MMSHContext *mmsh = h->priv_data;
219 MMSContext *mms;
220
221 mmsh->request_seq = h->is_streamed = 1;
222 mms = &mmsh->mms;
223 av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
224
225 av_url_split(NULL, 0, NULL, 0,
226 host, sizeof(host), &port, path, sizeof(path), mmsh->location);
227 if (port<0)
228 port = 80; // default mmsh protocol port
229 ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
230
231 if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
232 &h->interrupt_callback) < 0) {
233 return AVERROR(EIO);
234 }
235
236 snprintf(headers, sizeof(headers),
237 "Accept: */*\r\n"
238 USERAGENT
239 "Host: %s:%d\r\n"
240 "Pragma: no-cache,rate=1.000000,stream-time=0,"
241 "stream-offset=0:0,request-context=%u,max-duration=0\r\n"
242 CLIENTGUID
243 "Connection: Close\r\n",
244 host, port, mmsh->request_seq++);
245 av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
246
247 if (!mms->mms_hd->protocol_whitelist && h->protocol_whitelist) {
248 mms->mms_hd->protocol_whitelist = av_strdup(h->protocol_whitelist);
249 if (!mms->mms_hd->protocol_whitelist) {
250 err = AVERROR(ENOMEM);
251 goto fail;
252 }
253 }
254
255 err = ffurl_connect(mms->mms_hd, NULL);
256 if (err) {
257 goto fail;
258 }
259 err = get_http_header_data(mmsh);
260 if (err) {
261 av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
262 goto fail;
263 }
264
265 // close the socket and then reopen it for sending the second play request.
266 ffurl_closep(&mms->mms_hd);
267 memset(headers, 0, sizeof(headers));
268 if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
269 &h->interrupt_callback)) < 0) {
270 goto fail;
271 }
272 stream_selection = av_mallocz(mms->stream_num * 19 + 1);
273 if (!stream_selection)
274 return AVERROR(ENOMEM);
275 for (i = 0; i < mms->stream_num; i++) {
276 char tmp[20];
277 err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
278 if (err < 0)
279 goto fail;
280 av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
281 }
282 // send play request
283 err = snprintf(headers, sizeof(headers),
284 "Accept: */*\r\n"
285 USERAGENT
286 "Host: %s:%d\r\n"
287 "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
288 "Pragma: xPlayStrm=1\r\n"
289 CLIENTGUID
290 "Pragma: stream-switch-count=%d\r\n"
291 "Pragma: stream-switch-entry=%s\r\n"
292 "Pragma: no-cache,rate=1.000000,stream-time=%u"
293 "Connection: Close\r\n",
294 host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
295 av_freep(&stream_selection);
296 if (err < 0) {
297 av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
298 goto fail;
299 }
300 av_log(NULL, AV_LOG_TRACE, "out_buffer is %s", headers);
301 av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
302
303 err = ffurl_connect(mms->mms_hd, NULL);
304 if (err) {
305 goto fail;
306 }
307
308 err = get_http_header_data(mmsh);
309 if (err) {
310 av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
311 goto fail;
312 }
313
314 av_log(NULL, AV_LOG_TRACE, "Connection successfully open\n");
315 return 0;
316 fail:
317 av_freep(&stream_selection);
318 mmsh_close(h);
319 av_log(NULL, AV_LOG_TRACE, "Connection failed with error %d\n", err);
320 return err;
321 }
322
323 static int mmsh_open(URLContext *h, const char *uri, int flags)
324 {
325 return mmsh_open_internal(h, uri, flags, 0, 0);
326 }
327
328 static int handle_chunk_type(MMSHContext *mmsh)
329 {
330 MMSContext *mms = &mmsh->mms;
331 int res, len = 0;
332 ChunkType chunk_type;
333 chunk_type = get_chunk_header(mmsh, &len);
334
335 switch (chunk_type) {
336 case CHUNK_TYPE_END:
337 mmsh->chunk_seq = 0;
338 av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
339 return AVERROR(EIO);
340 case CHUNK_TYPE_STREAM_CHANGE:
341 mms->header_parsed = 0;
342 if (res = get_http_header_data(mmsh)) {
343 av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
344 return res;
345 }
346 break;
347 case CHUNK_TYPE_DATA:
348 return read_data_packet(mmsh, len);
349 default:
350 av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
351 return AVERROR_INVALIDDATA;
352 }
353 return 0;
354 }
355
356 static int mmsh_read(URLContext *h, uint8_t *buf, int size)
357 {
358 int res = 0;
359 MMSHContext *mmsh = h->priv_data;
360 MMSContext *mms = &mmsh->mms;
361 do {
362 if (mms->asf_header_read_size < mms->asf_header_size) {
363 // copy asf header into buffer
364 res = ff_mms_read_header(mms, buf, size);
365 } else {
366 if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
367 return res;
368 res = ff_mms_read_data(mms, buf, size);
369 }
370 } while (!res);
371 return res;
372 }
373
374 static int64_t mmsh_read_seek(URLContext *h, int stream_index,
375 int64_t timestamp, int flags)
376 {
377 MMSHContext *mmsh_old = h->priv_data;
378 MMSHContext *mmsh = av_mallocz(sizeof(*mmsh));
379 int ret;
380
381 if (!mmsh)
382 return AVERROR(ENOMEM);
383
384 h->priv_data = mmsh;
385 ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0);
386 if(ret>=0){
387 h->priv_data = mmsh_old;
388 mmsh_close(h);
389 h->priv_data = mmsh;
390 av_free(mmsh_old);
391 mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size;
392 }else {
393 h->priv_data = mmsh_old;
394 av_free(mmsh);
395 }
396
397 return ret;
398 }
399
400 static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
401 {
402 MMSHContext *mmsh = h->priv_data;
403 MMSContext *mms = &mmsh->mms;
404
405 if(pos == 0 && whence == SEEK_CUR)
406 return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
407 return AVERROR(ENOSYS);
408 }
409
410 const URLProtocol ff_mmsh_protocol = {
411 .name = "mmsh",
412 .url_open = mmsh_open,
413 .url_read = mmsh_read,
414 .url_seek = mmsh_seek,
415 .url_close = mmsh_close,
416 .url_read_seek = mmsh_read_seek,
417 .priv_data_size = sizeof(MMSHContext),
418 .flags = URL_PROTOCOL_FLAG_NETWORK,
419 .default_whitelist = "http,tcp",
420 };
421