FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* MMS protocol over TCP
3			* Copyright (c) 2006,2007 Ryan Martell
4			* Copyright (c) 2007 Björn Axelsson
5			* Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
6			*
7			* This file is part of FFmpeg.
8			*
9			* FFmpeg is free software; you can redistribute it and/or
10			* modify it under the terms of the GNU Lesser General Public
11			* License as published by the Free Software Foundation; either
12			* version 2.1 of the License, or (at your option) any later version.
13			*
14			* FFmpeg is distributed in the hope that it will be useful,
15			* but WITHOUT ANY WARRANTY; without even the implied warranty of
16			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17			* Lesser General Public License for more details.
18			*
19			* You should have received a copy of the GNU Lesser General Public
20			* License along with FFmpeg; if not, write to the Free Software
21			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22			*/
23
24			/* References
25			* MMS protocol specification:
26			* [1]http://msdn.microsoft.com/en-us/library/cc234711(PROT.10).aspx
27			* ASF specification. Revision 01.20.03.
28			* [2]http://web.archive.org/web/20131203084402/http://msdn.microsoft.com/en-us/library/bb643323.aspx
29			*/
30
31			#include "avformat.h"
32			#include "mms.h"
33			#include "avio_internal.h"
34			#include "libavutil/intreadwrite.h"
35			#include "libavutil/mem.h"
36			#include "libavcodec/bytestream.h"
37			#include "network.h"
38			#include "url.h"
39
40			#define LOCAL_ADDRESS 0xc0a80081 // FIXME get and use correct local ip address.
41			#define LOCAL_PORT 1037 // as above.
42			/** Client to server packet types. */
43			typedef enum {
44			CS_PKT_INITIAL = 0x01,
45			CS_PKT_PROTOCOL_SELECT = 0x02,
46			CS_PKT_MEDIA_FILE_REQUEST = 0x05,
47			CS_PKT_START_FROM_PKT_ID = 0x07,
48			CS_PKT_STREAM_PAUSE = 0x09,
49			CS_PKT_STREAM_CLOSE = 0x0d,
50			CS_PKT_MEDIA_HEADER_REQUEST = 0x15,
51			CS_PKT_TIMING_DATA_REQUEST = 0x18,
52			CS_PKT_USER_PASSWORD = 0x1a,
53			CS_PKT_KEEPALIVE = 0x1b,
54			CS_PKT_STREAM_ID_REQUEST = 0x33,
55			} MMSCSPacketType;
56
57			/** Server to client packet types. */
58			typedef enum {
59			/** Control packets. */
60			/*@{*/
61			SC_PKT_CLIENT_ACCEPTED = 0x01,
62			SC_PKT_PROTOCOL_ACCEPTED = 0x02,
63			SC_PKT_PROTOCOL_FAILED = 0x03,
64			SC_PKT_MEDIA_PKT_FOLLOWS = 0x05,
65			SC_PKT_MEDIA_FILE_DETAILS = 0x06,
66			SC_PKT_HEADER_REQUEST_ACCEPTED = 0x11,
67			SC_PKT_TIMING_TEST_REPLY = 0x15,
68			SC_PKT_PASSWORD_REQUIRED = 0x1a,
69			SC_PKT_KEEPALIVE = 0x1b,
70			SC_PKT_STREAM_STOPPED = 0x1e,
71			SC_PKT_STREAM_CHANGING = 0x20,
72			SC_PKT_STREAM_ID_ACCEPTED = 0x21,
73			/*@}*/
74
75			/** Pseudo packets. */
76			/*@{*/
77			SC_PKT_CANCEL = -1,
78			SC_PKT_NO_DATA = -2,
79			/*@}*/
80
81			/** Data packets. */
82			/*@{*/
83			SC_PKT_ASF_HEADER = 0x010000,// make it bigger than 0xFF in case of
84			SC_PKT_ASF_MEDIA = 0x010001,// receiving false data packets.
85			/*@}*/
86			} MMSSCPacketType;
87
88			typedef struct MMSTContext {
89			MMSContext mms;
90			int outgoing_packet_seq; ///< Outgoing packet sequence number.
91			char path[256]; ///< Path of the resource being asked for.
92			char host[128]; ///< Host of the resources.
93			int incoming_packet_seq; ///< Incoming packet sequence number.
94			int incoming_flags; ///< Incoming packet flags.
95			int packet_id; ///< Identifier for packets in the current stream.
96			unsigned int header_packet_id; ///< default is 2.
97			} MMSTContext;
98
99			/** Create MMST command packet header */
100		✗	static void start_command_packet(MMSTContext *mmst, MMSCSPacketType packet_type)
101			{
102		✗	MMSContext *mms = &mmst->mms;
103		✗	mms->write_out_ptr = mms->out_buffer;
104
105		✗	bytestream_put_le32(&mms->write_out_ptr, 1); // start sequence
106		✗	bytestream_put_le32(&mms->write_out_ptr, 0xb00bface);
107		✗	bytestream_put_le32(&mms->write_out_ptr, 0); // Length starts from after the protocol type bytes
108		✗	bytestream_put_le32(&mms->write_out_ptr, MKTAG('M','M','S',' '));
109		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
110		✗	bytestream_put_le32(&mms->write_out_ptr, mmst->outgoing_packet_seq++);
111		✗	bytestream_put_le64(&mms->write_out_ptr, 0); // timestamp
112		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
113		✗	bytestream_put_le16(&mms->write_out_ptr, packet_type);
114		✗	bytestream_put_le16(&mms->write_out_ptr, 3); // direction to server
115		✗	}
116
117			/** Add prefixes to MMST command packet. */
118		✗	static void insert_command_prefixes(MMSContext *mms,
119			uint32_t prefix1, uint32_t prefix2)
120			{
121		✗	bytestream_put_le32(&mms->write_out_ptr, prefix1); // first prefix
122		✗	bytestream_put_le32(&mms->write_out_ptr, prefix2); // second prefix
123		✗	}
124
125			/** Send a prepared MMST command packet. */
126		✗	static int send_command_packet(MMSTContext *mmst)
127			{
128		✗	MMSContext *mms = &mmst->mms;
129		✗	int len= mms->write_out_ptr - mms->out_buffer;
130		✗	int exact_length = FFALIGN(len, 8);
131		✗	int first_length= exact_length - 16;
132		✗	int len8= first_length/8;
133			int write_result;
134
135			// update packet length fields.
136		✗	AV_WL32(mms->out_buffer + 8, first_length);
137		✗	AV_WL32(mms->out_buffer + 16, len8);
138		✗	AV_WL32(mms->out_buffer + 32, len8-2);
139		✗	memset(mms->write_out_ptr, 0, exact_length - len);
140
141			// write it out.
142		✗	write_result= ffurl_write(mms->mms_hd, mms->out_buffer, exact_length);
143		✗	if(write_result != exact_length) {
144		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
145			"Failed to write data of length %d: %d (%s)\n",
146			exact_length, write_result,
147		✗	write_result < 0 ? strerror(AVUNERROR(write_result)) :
148			"The server closed the connection");
149		✗	return AVERROR(EIO);
150			}
151
152		✗	return 0;
153			}
154
155		✗	static int mms_put_utf16(MMSContext *mms, const uint8_t *src)
156			{
157			FFIOContext bic;
158		✗	int size = mms->write_out_ptr - mms->out_buffer;
159			int len;
160		✗	ffio_init_write_context(&bic, mms->write_out_ptr,
161		✗	sizeof(mms->out_buffer) - size);
162
163		✗	len = avio_put_str16le(&bic.pub, src);
164		✗	if (len < 0)
165		✗	return len;
166		✗	mms->write_out_ptr += len;
167		✗	return 0;
168			}
169
170		✗	static int send_time_test_data(MMSTContext *mmst)
171			{
172		✗	start_command_packet(mmst, CS_PKT_TIMING_DATA_REQUEST);
173		✗	insert_command_prefixes(&mmst->mms, 0x00f0f0f0, 0x0004000b);
174		✗	return send_command_packet(mmst);
175			}
176
177		✗	static int send_protocol_select(MMSTContext *mmst)
178			{
179			int ret;
180			char data_string[256];
181		✗	MMSContext *mms = &mmst->mms;
182
183		✗	start_command_packet(mmst, CS_PKT_PROTOCOL_SELECT);
184		✗	insert_command_prefixes(mms, 0, 0xffffffff);
185		✗	bytestream_put_le32(&mms->write_out_ptr, 0); // maxFunnelBytes
186		✗	bytestream_put_le32(&mms->write_out_ptr, 0x00989680); // maxbitRate
187		✗	bytestream_put_le32(&mms->write_out_ptr, 2); // funnelMode
188		✗	snprintf(data_string, sizeof(data_string), "\\\\%d.%d.%d.%d\\%s\\%d",
189			(LOCAL_ADDRESS>>24)&0xff,
190			(LOCAL_ADDRESS>>16)&0xff,
191			(LOCAL_ADDRESS>>8)&0xff,
192			LOCAL_ADDRESS&0xff,
193			"TCP", // or UDP
194			LOCAL_PORT);
195
196		✗	if ((ret = mms_put_utf16(mms, data_string)) < 0)
197		✗	return ret;
198		✗	return send_command_packet(mmst);
199			}
200
201		✗	static int send_media_file_request(MMSTContext *mmst)
202			{
203			int ret;
204		✗	MMSContext *mms = &mmst->mms;
205		✗	start_command_packet(mmst, CS_PKT_MEDIA_FILE_REQUEST);
206		✗	insert_command_prefixes(mms, 1, 0xffffffff);
207		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
208		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
209		✗	if ((ret = mms_put_utf16(mms, mmst->path + 1)) < 0) // +1 for skip "/"
210		✗	return ret;
211
212		✗	return send_command_packet(mmst);
213			}
214
215		✗	static void handle_packet_stream_changing_type(MMSTContext *mmst)
216			{
217		✗	MMSContext *mms = &mmst->mms;
218		✗	av_log(mms->mms_hd, AV_LOG_TRACE, "Stream changing!\n");
219
220			// 40 is the packet header size, 7 is the prefix size.
221		✗	mmst->header_packet_id= AV_RL32(mms->in_buffer + 40 + 7);
222		✗	av_log(mms->mms_hd, AV_LOG_TRACE, "Changed header prefix to 0x%x", mmst->header_packet_id);
223		✗	}
224
225		✗	static int send_keepalive_packet(MMSTContext *mmst)
226			{
227			// respond to a keepalive with a keepalive...
228		✗	start_command_packet(mmst, CS_PKT_KEEPALIVE);
229		✗	insert_command_prefixes(&mmst->mms, 1, 0x100FFFF);
230		✗	return send_command_packet(mmst);
231			}
232
233			/** Pad media packets smaller than max_packet_size and/or adjust read position
234			* after a seek. */
235		✗	static void pad_media_packet(MMSContext *mms)
236			{
237		✗	if(mms->remaining_in_len<mms->asf_packet_len) {
238		✗	int padding_size = mms->asf_packet_len - mms->remaining_in_len;
239		✗	memset(mms->in_buffer + mms->remaining_in_len, 0, padding_size);
240		✗	mms->remaining_in_len += padding_size;
241			}
242		✗	}
243
244			/** Read incoming MMST media, header or command packet. */
245		✗	static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
246			{
247			int read_result;
248		✗	MMSSCPacketType packet_type= -1;
249		✗	MMSContext *mms = &mmst->mms;
250			for(;;) {
251		✗	read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer, 8);
252		✗	if (read_result != 8) {
253		✗	if(read_result < 0) {
254		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
255			"Error reading packet header: %d (%s)\n",
256			read_result, strerror(AVUNERROR(read_result)));
257		✗	packet_type = SC_PKT_CANCEL;
258			} else {
259		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
260			"The server closed the connection\n");
261		✗	packet_type = SC_PKT_NO_DATA;
262			}
263		✗	return packet_type;
264			}
265
266			// handle command packet.
267		✗	if(AV_RL32(mms->in_buffer + 4)==0xb00bface) {
268			int length_remaining, hr;
269
270		✗	mmst->incoming_flags= mms->in_buffer[3];
271		✗	read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer+8, 4);
272		✗	if(read_result != 4) {
273		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
274			"Reading command packet length failed: %d (%s)\n",
275			read_result,
276		✗	read_result < 0 ? strerror(AVUNERROR(read_result)) :
277			"The server closed the connection");
278		✗	return read_result < 0 ? read_result : AVERROR(EIO);
279			}
280
281		✗	length_remaining= AV_RL32(mms->in_buffer+8) + 4;
282		✗	av_log(mms->mms_hd, AV_LOG_TRACE, "Length remaining is %d\n", length_remaining);
283			// read the rest of the packet.
284		✗	if (length_remaining < 0
285		✗	|| length_remaining > sizeof(mms->in_buffer) - 12) {
286		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
287			"Incoming packet length %d exceeds bufsize %"SIZE_SPECIFIER"\n",
288			length_remaining, sizeof(mms->in_buffer) - 12);
289		✗	return AVERROR_INVALIDDATA;
290			}
291		✗	read_result = ffurl_read_complete(mms->mms_hd, mms->in_buffer + 12,
292			length_remaining) ;
293		✗	if (read_result != length_remaining) {
294		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
295			"Reading pkt data (length=%d) failed: %d (%s)\n",
296			length_remaining, read_result,
297		✗	read_result < 0 ? strerror(AVUNERROR(read_result)) :
298			"The server closed the connection");
299		✗	return read_result < 0 ? read_result : AVERROR(EIO);
300			}
301		✗	packet_type= AV_RL16(mms->in_buffer+36);
302		✗	if (read_result >= 44 && (hr = AV_RL32(mms->in_buffer + 40))) {
303		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
304			"Server sent a message with packet type 0x%x and error status code 0x%08x\n", packet_type, hr);
305		✗	return AVERROR(EINVAL);
306			}
307			} else {
308			int length_remaining;
309			int packet_id_type;
310			int tmp;
311
312			// note we cache the first 8 bytes,
313			// then fill up the buffer with the others
314		✗	tmp = AV_RL16(mms->in_buffer + 6);
315		✗	length_remaining = (tmp - 8) & 0xffff;
316		✗	mmst->incoming_packet_seq = AV_RL32(mms->in_buffer);
317		✗	packet_id_type = mms->in_buffer[4];
318		✗	mmst->incoming_flags = mms->in_buffer[5];
319
320		✗	if (length_remaining < 0
321		✗	|| length_remaining > sizeof(mms->in_buffer) - 8) {
322		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
323			"Data length %d is invalid or too large (max=%"SIZE_SPECIFIER")\n",
324			length_remaining, sizeof(mms->in_buffer));
325		✗	return AVERROR_INVALIDDATA;
326			}
327		✗	mms->remaining_in_len = length_remaining;
328		✗	mms->read_in_ptr = mms->in_buffer;
329		✗	read_result= ffurl_read_complete(mms->mms_hd, mms->in_buffer, length_remaining);
330		✗	if(read_result != length_remaining) {
331		✗	av_log(mms->mms_hd, AV_LOG_ERROR,
332			"Failed to read packet data of size %d: %d (%s)\n",
333			length_remaining, read_result,
334		✗	read_result < 0 ? strerror(AVUNERROR(read_result)) :
335			"The server closed the connection");
336		✗	return read_result < 0 ? read_result : AVERROR(EIO);
337			}
338
339			// if we successfully read everything.
340		✗	if(packet_id_type == mmst->header_packet_id) {
341			int err;
342		✗	packet_type = SC_PKT_ASF_HEADER;
343			// Store the asf header
344		✗	if(!mms->header_parsed) {
345		✗	if ((err = av_reallocp(&mms->asf_header,
346		✗	mms->asf_header_size +
347		✗	mms->remaining_in_len)) < 0) {
348		✗	mms->asf_header_size = 0;
349		✗	return err;
350			}
351		✗	memcpy(mms->asf_header + mms->asf_header_size,
352		✗	mms->read_in_ptr, mms->remaining_in_len);
353		✗	mms->asf_header_size += mms->remaining_in_len;
354			}
355			// 0x04 means asf header is sent in multiple packets.
356		✗	if (mmst->incoming_flags == 0x04)
357		✗	continue;
358		✗	} else if(packet_id_type == mmst->packet_id) {
359		✗	packet_type = SC_PKT_ASF_MEDIA;
360			} else {
361		✗	av_log(mms->mms_hd, AV_LOG_TRACE, "packet id type %d is old.", packet_id_type);
362		✗	continue;
363			}
364			}
365
366			// preprocess some packet type
367		✗	if(packet_type == SC_PKT_KEEPALIVE) {
368		✗	send_keepalive_packet(mmst);
369		✗	continue;
370		✗	} else if(packet_type == SC_PKT_STREAM_CHANGING) {
371		✗	handle_packet_stream_changing_type(mmst);
372		✗	} else if(packet_type == SC_PKT_ASF_MEDIA) {
373		✗	pad_media_packet(mms);
374			}
375		✗	return packet_type;
376			}
377			}
378
379		✗	static int mms_safe_send_recv(MMSTContext *mmst,
380			int (*send_fun)(MMSTContext *mmst),
381			const MMSSCPacketType expect_type)
382			{
383			MMSSCPacketType type;
384		✗	if(send_fun) {
385		✗	int ret = send_fun(mmst);
386		✗	if (ret < 0) {
387		✗	av_log(NULL, AV_LOG_TRACE, "Send Packet error before expecting recv packet %d\n", expect_type);
388		✗	return ret;
389			}
390			}
391
392		✗	if ((type = get_tcp_server_response(mmst)) != expect_type) {
393		✗	av_log(NULL, AV_LOG_ERROR,
394			"Corrupt stream (unexpected packet type 0x%x, expected 0x%x)\n",
395			type, expect_type);
396		✗	return AVERROR_INVALIDDATA;
397			} else {
398		✗	return 0;
399			}
400			}
401
402		✗	static int send_media_header_request(MMSTContext *mmst)
403			{
404		✗	MMSContext *mms = &mmst->mms;
405		✗	start_command_packet(mmst, CS_PKT_MEDIA_HEADER_REQUEST);
406		✗	insert_command_prefixes(mms, 1, 0);
407		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
408		✗	bytestream_put_le32(&mms->write_out_ptr, 0x00800000);
409		✗	bytestream_put_le32(&mms->write_out_ptr, 0xffffffff);
410		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
411		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
412		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
413
414			// the media preroll value in milliseconds?
415		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
416		✗	bytestream_put_le32(&mms->write_out_ptr, 0x40AC2000);
417		✗	bytestream_put_le32(&mms->write_out_ptr, 2);
418		✗	bytestream_put_le32(&mms->write_out_ptr, 0);
419
420		✗	return send_command_packet(mmst);
421			}
422
423			/** Send the initial handshake. */
424		✗	static int send_startup_packet(MMSTContext *mmst)
425			{
426			char data_string[256];
427			int ret;
428		✗	MMSContext *mms = &mmst->mms;
429			// SubscriberName is defined in MS specification linked below.
430			// The GUID value can be any valid value.
431			// http://download.microsoft.com/
432			// download/9/5/E/95EF66AF-9026-4BB0-A41D-A4F81802D92C/%5BMS-WMSP%5D.pdf
433		✗	snprintf(data_string, sizeof(data_string),
434			"NSPlayer/7.0.0.1956; {%s}; Host: %s",
435		✗	"7E667F5D-A661-495E-A512-F55686DDA178", mmst->host);
436
437		✗	start_command_packet(mmst, CS_PKT_INITIAL);
438		✗	insert_command_prefixes(mms, 0, 0x0004000b);
439		✗	bytestream_put_le32(&mms->write_out_ptr, 0x0003001c);
440		✗	if ((ret = mms_put_utf16(mms, data_string)) < 0)
441		✗	return ret;
442		✗	return send_command_packet(mmst);
443			}
444
445			/** Send MMST stream selection command based on the AVStream->discard values. */
446		✗	static int send_stream_selection_request(MMSTContext *mmst)
447			{
448			int i;
449		✗	MMSContext *mms = &mmst->mms;
450			// send the streams we want back...
451		✗	start_command_packet(mmst, CS_PKT_STREAM_ID_REQUEST);
452		✗	bytestream_put_le32(&mms->write_out_ptr, mms->stream_num); // stream nums
453		✗	for(i= 0; i<mms->stream_num; i++) {
454		✗	bytestream_put_le16(&mms->write_out_ptr, 0xffff); // flags
455		✗	bytestream_put_le16(&mms->write_out_ptr, mms->streams[i].id); // stream id
456		✗	bytestream_put_le16(&mms->write_out_ptr, 0); // selection
457			}
458		✗	return send_command_packet(mmst);
459			}
460
461		✗	static int send_close_packet(MMSTContext *mmst)
462			{
463		✗	start_command_packet(mmst, CS_PKT_STREAM_CLOSE);
464		✗	insert_command_prefixes(&mmst->mms, 1, 1);
465
466		✗	return send_command_packet(mmst);
467			}
468
469			/** Close the MMSH/MMST connection */
470		✗	static int mms_close(URLContext *h)
471			{
472		✗	MMSTContext *mmst = (MMSTContext *)h->priv_data;
473		✗	MMSContext *mms = &mmst->mms;
474		✗	if(mms->mms_hd) {
475		✗	send_close_packet(mmst);
476		✗	ffurl_closep(&mms->mms_hd);
477			}
478
479			/* free all separately allocated pointers in mms */
480		✗	av_freep(&mms->streams);
481		✗	av_freep(&mms->asf_header);
482
483		✗	return 0;
484			}
485
486		✗	static int send_media_packet_request(MMSTContext *mmst)
487			{
488		✗	MMSContext *mms = &mmst->mms;
489		✗	start_command_packet(mmst, CS_PKT_START_FROM_PKT_ID);
490		✗	insert_command_prefixes(mms, 1, 0x0001FFFF);
491		✗	bytestream_put_le64(&mms->write_out_ptr, 0); // seek timestamp
492		✗	bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // unknown
493		✗	bytestream_put_le32(&mms->write_out_ptr, 0xffffffff); // packet offset
494		✗	bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
495		✗	bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
496		✗	bytestream_put_byte(&mms->write_out_ptr, 0xff); // max stream time limit
497		✗	bytestream_put_byte(&mms->write_out_ptr, 0x00); // stream time limit flag
498
499		✗	mmst->packet_id++; // new packet_id
500		✗	bytestream_put_le32(&mms->write_out_ptr, mmst->packet_id);
501		✗	return send_command_packet(mmst);
502			}
503
504
505		✗	static void clear_stream_buffers(MMSContext *mms)
506			{
507		✗	mms->remaining_in_len = 0;
508		✗	mms->read_in_ptr = mms->in_buffer;
509		✗	}
510
511		✗	static int mms_open(URLContext *h, const char *uri, int flags)
512			{
513		✗	MMSTContext *mmst = h->priv_data;
514			MMSContext *mms;
515			int port, err;
516			char tcpname[256];
517
518		✗	h->is_streamed = 1;
519		✗	mms = &mmst->mms;
520
521			// only for MMS over TCP, so set proto = NULL
522		✗	av_url_split(NULL, 0, NULL, 0,
523		✗	mmst->host, sizeof(mmst->host), &port, mmst->path,
524			sizeof(mmst->path), uri);
525
526		✗	if(port<0)
527		✗	port = 1755; // default MMS protocol port
528
529			// establish tcp connection.
530		✗	ff_url_join(tcpname, sizeof(tcpname), "tcp", NULL, mmst->host, port, NULL);
531		✗	err = ffurl_open_whitelist(&mms->mms_hd, tcpname, AVIO_FLAG_READ_WRITE,
532		✗	&h->interrupt_callback, NULL,
533			h->protocol_whitelist, h->protocol_blacklist, h);
534		✗	if (err)
535		✗	goto fail;
536
537		✗	mmst->packet_id = 3; // default, initial value.
538		✗	mmst->header_packet_id = 2; // default, initial value.
539		✗	err = mms_safe_send_recv(mmst, send_startup_packet, SC_PKT_CLIENT_ACCEPTED);
540		✗	if (err)
541		✗	goto fail;
542		✗	err = mms_safe_send_recv(mmst, send_time_test_data, SC_PKT_TIMING_TEST_REPLY);
543		✗	if (err)
544		✗	goto fail;
545		✗	err = mms_safe_send_recv(mmst, send_protocol_select, SC_PKT_PROTOCOL_ACCEPTED);
546		✗	if (err)
547		✗	goto fail;
548		✗	err = mms_safe_send_recv(mmst, send_media_file_request, SC_PKT_MEDIA_FILE_DETAILS);
549		✗	if (err)
550		✗	goto fail;
551		✗	err = mms_safe_send_recv(mmst, send_media_header_request, SC_PKT_HEADER_REQUEST_ACCEPTED);
552		✗	if (err)
553		✗	goto fail;
554		✗	err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_HEADER);
555		✗	if (err)
556		✗	goto fail;
557		✗	if((mmst->incoming_flags != 0X08) && (mmst->incoming_flags != 0X0C)) {
558		✗	av_log(h, AV_LOG_ERROR,
559			"The server does not support MMST (try MMSH or RTSP)\n");
560		✗	err = AVERROR(EINVAL);
561		✗	goto fail;
562			}
563		✗	err = ff_mms_asf_header_parser(mms);
564		✗	if (err) {
565		✗	av_log(h, AV_LOG_TRACE, "asf header parsed failed!\n");
566		✗	goto fail;
567			}
568		✗	mms->header_parsed = 1;
569
570		✗	if (!mms->asf_packet_len || !mms->stream_num)
571		✗	goto fail;
572
573		✗	clear_stream_buffers(mms);
574		✗	err = mms_safe_send_recv(mmst, send_stream_selection_request, SC_PKT_STREAM_ID_ACCEPTED);
575		✗	if (err)
576		✗	goto fail;
577			// send media packet request
578		✗	err = mms_safe_send_recv(mmst, send_media_packet_request, SC_PKT_MEDIA_PKT_FOLLOWS);
579		✗	if (err) {
580		✗	goto fail;
581			}
582		✗	av_log(h, AV_LOG_TRACE, "Leaving open (success)\n");
583		✗	return 0;
584		✗	fail:
585		✗	mms_close(h);
586		✗	av_log(mms->mms_hd, AV_LOG_TRACE, "Leaving open (failure: %d)\n", err);
587		✗	return err;
588			}
589
590			/** Read ASF data through the protocol. */
591		✗	static int mms_read(URLContext *h, uint8_t *buf, int size)
592			{
593			/* TODO: see tcp.c:tcp_read() about a possible timeout scheme */
594		✗	MMSTContext *mmst = h->priv_data;
595		✗	MMSContext *mms = &mmst->mms;
596		✗	int result = 0;
597
598			do {
599		✗	if(mms->asf_header_read_size < mms->asf_header_size) {
600			/* Read from ASF header buffer */
601		✗	result = ff_mms_read_header(mms, buf, size);
602		✗	} else if(mms->remaining_in_len) {
603			/* Read remaining packet data to buffer.
604			* the result can not be zero because remaining_in_len is positive.*/
605		✗	result = ff_mms_read_data(mms, buf, size);
606			} else {
607			/* Read from network */
608		✗	int err = mms_safe_send_recv(mmst, NULL, SC_PKT_ASF_MEDIA);
609		✗	if (err == 0) {
610		✗	if(mms->remaining_in_len>mms->asf_packet_len) {
611		✗	av_log(h, AV_LOG_ERROR,
612			"Incoming pktlen %d is larger than ASF pktsize %d\n",
613			mms->remaining_in_len, mms->asf_packet_len);
614		✗	result= AVERROR(EIO);
615			} else {
616			// copy the data to the packet buffer.
617		✗	result = ff_mms_read_data(mms, buf, size);
618		✗	if (result == 0) {
619		✗	av_log(h, AV_LOG_TRACE, "Read ASF media packet size is zero!\n");
620		✗	break;
621			}
622			}
623			} else {
624		✗	av_log(h, AV_LOG_TRACE, "read packet error!\n");
625		✗	break;
626			}
627			}
628		✗	} while(!result); // only return one packet.
629		✗	return result;
630			}
631
632			const URLProtocol ff_mmst_protocol = {
633			.name = "mmst",
634			.url_open = mms_open,
635			.url_read = mms_read,
636			.url_close = mms_close,
637			.priv_data_size = sizeof(MMSTContext),
638			.flags = URL_PROTOCOL_FLAG_NETWORK,
639			};
640