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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.
50typedef 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
57typedef 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
64static 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
75static 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
116static 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
144static 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
214static 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;
318fail:
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
325static int mmsh_open(URLContext *h, const char *uri, int flags)
326{
327 return mmsh_open_internal(h, uri, flags, 0, 0);
328}
329
330static 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
358static 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
376static 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
402static 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
412const 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};
423
generated by cgit at 2024-05-18 08:40:34 (GMT)