/[svn]/linuxsampler/trunk/src/network/lscpparser.h
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Contents of /linuxsampler/trunk/src/network/lscpparser.h

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Revision 35 - (show annotations) (download) (as text)
Fri Mar 5 13:46:15 2004 UTC (20 years ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 5316 byte(s)
* implemented parser for the LinuxSampler control protocol (LSCP) by using
  flex / bison (where src/network/lscp.l is the input file for lex / flex
  and src/network/lscp.y is the input file for yacc / bison), parser and
  scanner can be regenerated by 'make parser'
* implemented LSCP network server (only single threaded so far), LSCP
  server will be launched if LinuxSampler was started with "--server" flag,
  implemented the following LSCP commands so far: "LOAD INSTRUMENT", "GET
  CHANNEL VOICE_COUNT", "GET CHANNEL STREAM_COUNT", "GET CHANNEL
  BUFFER_FILL", "SET CHANNEL VOLUME" and "RESET CHANNEL"
* disk thread now started within the engine

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck *
6 * *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
11 * *
12 * This program 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 *
15 * GNU General Public License for more details. *
16 * *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the Free Software *
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20 * MA 02111-1307 USA *
21 ***************************************************************************/
22
23 #ifndef __LSCPPARSER_H__
24 #define __LSCPPARSER_H__
25
26 #include <sys/types.h>
27 #include <sys/socket.h>
28
29 #include <stdlib.h>
30 #include <iostream>
31 #include <sstream>
32 #include <string>
33
34 #include "../global.h"
35
36 /// Will be returned by the parser in case of syntax errors.
37 #define LSCP_SYNTAX_ERROR -69
38
39 /**
40 * How the fill states of disk stream buffers should be reflected.
41 */
42 enum fill_response_t {
43 fill_response_bytes, ///< The returned values are meant in bytes.
44 fill_response_percentage ///< The returned values are meant in percentage.
45 };
46
47 /**
48 * Which audio output system to be used.
49 */
50 enum audio_output_type_t {
51 audio_output_type_alsa,
52 audio_output_type_jack
53 };
54
55 /**
56 * Semantic value of the lookahead symbol.
57 *
58 * Structure that is used by the parser to process and return values from the
59 * input text. The lexical analyzer for example returns a number for
60 * recognized number strings in the input text and the parser might return a
61 * value for each of it's rules.
62 */
63 struct YYSTYPE {
64 union {
65 char Char;
66 unsigned int Number;
67 double Dotnum;
68 fill_response_t FillResponse;
69 audio_output_type_t AudioOutput;
70 };
71 std::string String;
72 };
73 #define yystype YYSTYPE ///< For backward compatibility.
74 #define YYSTYPE_IS_DECLARED ///< We tell the lexer / parser that we use our own data structure as defined above.
75
76 // just symbol prototyping
77 class LSCPServer;
78
79 // pointer to an (reentrant) scanner / lexical analyzer
80 typedef void* yyscan_t;
81
82 /**
83 * Parameters given to the parser on every yyparse() call.
84 */
85 struct yyparse_param_t {
86 LSCPServer* pServer;
87 yyscan_t pScanner;
88 };
89 #define YYPARSE_PARAM yyparse_param
90
91 /**
92 * Prototype of the main scanner function (lexical analyzer).
93 */
94 #define YY_DECL int yylex(YYSTYPE* yylval, yyscan_t yyscanner)
95
96 /**
97 * Override lex's input function which just reads from stdin by default.
98 * We read from a socket instead.
99 */
100 #define YY_INPUT(buf,result,max_size) \
101 errno=0; \
102 while ( (result = recv(hSession, buf, max_size, 0)) < 0 ) \
103 { \
104 if(errno != EINTR) \
105 { \
106 switch(errno) { \
107 case EBADF: \
108 dmsg(2,("LSCPScanner: The argument s is an invalid descriptor.\n")); \
109 break; \
110 case ECONNREFUSED: \
111 dmsg(2,("LSCPScanner: A remote host refused to allow the network connection (typically because it is not running the requested service).\n")); \
112 break; \
113 case ENOTCONN: \
114 dmsg(2,("LSCPScanner: The socket is associated with a connection-oriented protocol and has not been connected (see connect(2) and accept(2)).\n")); \
115 break; \
116 case ENOTSOCK: \
117 dmsg(2,("LSCPScanner: The argument s does not refer to a socket.\n")); \
118 break; \
119 case EAGAIN: \
120 dmsg(2,("LSCPScanner: The socket is marked non-blocking and the receive operation would block, or a receive timeout had been set and the timeout expired before data was received.\n")); \
121 break; \
122 case EINTR: \
123 dmsg(2,("LSCPScanner: The receive was interrupted by delivery of a signal before any data were available.\n")); \
124 break; \
125 case EFAULT: \
126 dmsg(2,("LSCPScanner: The receive buffer pointer(s) point outside the process's address space.\n")); \
127 break; \
128 case EINVAL: \
129 dmsg(2,("LSCPScanner: Invalid argument passed.\n")); \
130 break; \
131 case ENOMEM: \
132 dmsg(2,("LSCPScanner: Could not allocate memory for recvmsg.\n")); \
133 break; \
134 default: \
135 dmsg(2,("LSCPScanner: Unknown recv() error.\n")); \
136 break; \
137 } \
138 YY_FATAL_ERROR( "input in flex scanner failed" ); \
139 break; \
140 } \
141 errno=0; \
142 clearerr(yyin); \
143 }\
144
145
146 #endif // __LSCPPARSER_H__

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