2 * MMS protocol over HTTP
3 * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Windows Media HTTP Streaming Protocol.
25 * http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/opt.h"
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.
42 #define USERAGENT "User-Agent: NSPlayer/4.1.0.3856\r\n"
44 // the guid value can be changed to any valid value.
45 #define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
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.
51 CHUNK_TYPE_DATA = 0x4424,
52 CHUNK_TYPE_ASF_HEADER = 0x4824,
53 CHUNK_TYPE_END = 0x4524,
54 CHUNK_TYPE_STREAM_CHANGE = 0x4324,
59 uint8_t location[1024];
60 int request_seq; ///< request packet sequence
61 int chunk_seq; ///< data packet sequence
64 static int mmsh_close(URLContext *h)
66 MMSHContext *mmsh = (MMSHContext *)h->priv_data;
67 MMSContext *mms = &mmsh->mms;
69 ffurl_close(mms->mms_hd);
70 av_free(mms->streams);
71 av_free(mms->asf_header);
72 av_freep(&h->priv_data);
76 static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
78 MMSContext *mms = &mmsh->mms;
79 uint8_t chunk_header[CHUNK_HEADER_LENGTH];
80 uint8_t ext_header[EXT_HEADER_LENGTH];
82 int chunk_len, res, ext_header_len;
84 res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
85 if (res != CHUNK_HEADER_LENGTH) {
86 av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
89 chunk_type = AV_RL16(chunk_header);
90 chunk_len = AV_RL16(chunk_header + 2);
94 case CHUNK_TYPE_STREAM_CHANGE:
97 case CHUNK_TYPE_ASF_HEADER:
102 av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
103 return AVERROR_INVALIDDATA;
106 res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
107 if (res != ext_header_len) {
108 av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
111 *len = chunk_len - ext_header_len;
112 if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
113 mmsh->chunk_seq = AV_RL32(ext_header);
117 static int read_data_packet(MMSHContext *mmsh, const int len)
119 MMSContext *mms = &mmsh->mms;
121 if (len > sizeof(mms->in_buffer)) {
122 av_log(NULL, AV_LOG_ERROR,
123 "Data packet length %d exceeds the in_buffer size %zu\n",
124 len, sizeof(mms->in_buffer));
127 res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
128 av_dlog(NULL, "Data packet len = %d\n", len);
130 av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
133 if (len > mms->asf_packet_len) {
134 av_log(NULL, AV_LOG_ERROR,
135 "Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
136 return AVERROR_INVALIDDATA;
138 memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
140 mms->read_in_ptr = mms->in_buffer;
141 mms->remaining_in_len = mms->asf_packet_len;
145 static int get_http_header_data(MMSHContext *mmsh)
147 MMSContext *mms = &mmsh->mms;
149 ChunkType chunk_type;
153 res = chunk_type = get_chunk_header(mmsh, &len);
156 } else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
157 // get asf header and stored it
158 if (!mms->header_parsed) {
159 if (mms->asf_header) {
160 if (len != mms->asf_header_size) {
161 mms->asf_header_size = len;
162 av_dlog(NULL, "Header len changed from %d to %d\n",
163 mms->asf_header_size, len);
164 av_freep(&mms->asf_header);
167 mms->asf_header = av_mallocz(len);
168 if (!mms->asf_header) {
169 return AVERROR(ENOMEM);
171 mms->asf_header_size = len;
173 if (len > mms->asf_header_size) {
174 av_log(NULL, AV_LOG_ERROR,
175 "Asf header packet len = %d exceed the asf header buf size %d\n",
176 len, mms->asf_header_size);
179 res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
181 av_log(NULL, AV_LOG_ERROR,
182 "Recv asf header data len %d != expected len %d\n", res, len);
185 mms->asf_header_size = len;
186 if (!mms->header_parsed) {
187 res = ff_mms_asf_header_parser(mms);
188 mms->header_parsed = 1;
191 } else if (chunk_type == CHUNK_TYPE_DATA) {
192 // read data packet and do padding
193 return read_data_packet(mmsh, len);
196 if (len > sizeof(mms->in_buffer)) {
197 av_log(NULL, AV_LOG_ERROR,
198 "Other packet len = %d exceed the in_buffer size %zu\n",
199 len, sizeof(mms->in_buffer));
202 res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
204 av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
207 av_dlog(NULL, "Skip chunk type %d \n", chunk_type);
215 static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
218 char httpname[256], path[256], host[128];
219 char *stream_selection = NULL;
224 mmsh = h->priv_data = av_mallocz(sizeof(MMSHContext));
226 return AVERROR(ENOMEM);
227 mmsh->request_seq = h->is_streamed = 1;
229 av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
231 av_url_split(NULL, 0, NULL, 0,
232 host, sizeof(host), &port, path, sizeof(path), mmsh->location);
234 port = 80; // default mmsh protocol port
235 ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
237 if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
238 &h->interrupt_callback) < 0) {
242 snprintf(headers, sizeof(headers),
246 "Pragma: no-cache,rate=1.000000,stream-time=0,"
247 "stream-offset=0:0,request-context=%u,max-duration=0\r\n"
249 "Connection: Close\r\n",
250 host, port, mmsh->request_seq++);
251 av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
253 err = ffurl_connect(mms->mms_hd, NULL);
257 err = get_http_header_data(mmsh);
259 av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
263 // close the socket and then reopen it for sending the second play request.
264 ffurl_close(mms->mms_hd);
265 memset(headers, 0, sizeof(headers));
266 if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
267 &h->interrupt_callback) < 0) {
270 stream_selection = av_mallocz(mms->stream_num * 19 + 1);
271 if (!stream_selection)
272 return AVERROR(ENOMEM);
273 for (i = 0; i < mms->stream_num; i++) {
275 err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
278 av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
281 err = snprintf(headers, sizeof(headers),
285 "Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
286 "Pragma: xPlayStrm=1\r\n"
288 "Pragma: stream-switch-count=%d\r\n"
289 "Pragma: stream-switch-entry=%s\r\n"
290 "Pragma: no-cache,rate=1.000000,stream-time=%u"
291 "Connection: Close\r\n",
292 host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
293 av_freep(&stream_selection);
295 av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
298 av_dlog(NULL, "out_buffer is %s", headers);
299 av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
301 err = ffurl_connect(mms->mms_hd, NULL);
306 err = get_http_header_data(mmsh);
308 av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
312 av_dlog(NULL, "Connection successfully open\n");
315 av_freep(&stream_selection);
317 av_dlog(NULL, "Connection failed with error %d\n", err);
321 static int mmsh_open(URLContext *h, const char *uri, int flags)
323 return mmsh_open_internal(h, uri, flags, 0, 0);
326 static int handle_chunk_type(MMSHContext *mmsh)
328 MMSContext *mms = &mmsh->mms;
330 ChunkType chunk_type;
331 chunk_type = get_chunk_header(mmsh, &len);
333 switch (chunk_type) {
336 av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
338 case CHUNK_TYPE_STREAM_CHANGE:
339 mms->header_parsed = 0;
340 if (res = get_http_header_data(mmsh)) {
341 av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
345 case CHUNK_TYPE_DATA:
346 return read_data_packet(mmsh, len);
348 av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
349 return AVERROR_INVALIDDATA;
354 static int mmsh_read(URLContext *h, uint8_t *buf, int size)
357 MMSHContext *mmsh = h->priv_data;
358 MMSContext *mms = &mmsh->mms;
360 if (mms->asf_header_read_size < mms->asf_header_size) {
361 // copy asf header into buffer
362 res = ff_mms_read_header(mms, buf, size);
364 if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
366 res = ff_mms_read_data(mms, buf, size);
372 static int64_t mmsh_read_seek(URLContext *h, int stream_index,
373 int64_t timestamp, int flags)
375 MMSHContext *mmsh = h->priv_data;
376 MMSContext *mms = &mmsh->mms;
379 ret= mmsh_open_internal(h, mmsh->location, 0, FFMAX(timestamp, 0), 0);
383 ffurl_close(mms->mms_hd);
384 av_freep(&mms->streams);
385 av_freep(&mms->asf_header);
389 mms->asf_header_read_size= mms->asf_header_size;
395 static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
397 MMSHContext *mmsh = h->priv_data;
398 MMSContext *mms = &mmsh->mms;
400 if(pos == 0 && whence == SEEK_CUR)
401 return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * mms->asf_packet_len;
402 return AVERROR(ENOSYS);
405 URLProtocol ff_mmsh_protocol = {
407 .url_open = mmsh_open,
408 .url_read = mmsh_read,
409 .url_seek = mmsh_seek,
410 .url_close = mmsh_close,
411 .url_read_seek = mmsh_read_seek,