2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file afs.h functions and structures for audio format handling (para_server) */
23 #define OV_AUDIO_FORMAT " ogg"
24 #define OV_AUDIO_FORMAT_ARRAY , "ogg"
26 #define OV_AUDIO_FORMAT ""
27 #define OV_AUDIO_FORMAT_ARRAY
31 #define AAC_AUDIO_FORMAT " aac"
32 #define AAC_AUDIO_FORMAT_ARRAY , "aac"
34 #define AAC_AUDIO_FORMAT ""
35 #define AAC_AUDIO_FORMAT_ARRAY
38 #define SUPPORTED_AUDIO_FORMATS "mp3" OV_AUDIO_FORMAT AAC_AUDIO_FORMAT
39 #define SUPPORTED_AUDIO_FORMATS_ARRAY "mp3" OV_AUDIO_FORMAT_ARRAY \
40 AAC_AUDIO_FORMAT_ARRAY, NULL
51 * structure for audio format handling
53 * There's exactly one such struct for each supported audio format. Initially,
54 * only \a name and \a init are defined. During the startup process,
55 * para_server calls the \a init function of each audio format handler which is
56 * expected to fill in all the other function pointers.
58 struct audio_format_handler {
60 * name of the audio format
64 * typical file endings for files that can be handled by this afh.
66 const char **suffixes;
68 * pointer to the audio format handler's init function
70 * Must initialize all function pointers and is assumed to succeed.
74 * period of time between sending data chunks
76 struct timeval chunk_tv; /* length of one chunk of data */
78 * end of file timeout - do not load new audio file until this time
81 struct timeval eof_tv; /* timeout on eof */
83 * Pointer to the optional get-header function.
85 * This is called from a sender in case a new client connects in the middle of
86 * the stream. The audio format handler may set this to NULL to indicate that
87 * this audio format does not need any special header treatment. If non-NULL,
88 * the function it points to must return a pointer to a buffer holding the
89 * current audio file header, together with the header length.
91 char *(*get_header_info)(int *header_len);
93 * check if this audio format handler can handle the file
95 * This is a pointer to a function returning whether a given file is valid for
96 * this audio format. A negative return value indicates that this audio format
97 * handler did not recognize the given file. On success, the function is
98 * expected to return a positive value and to fill in \arg info_str, \arg
99 * chunks and \arg seconds appropriately.
101 int (*get_file_info)(FILE *audio_file, char *info_str,
102 long unsigned *chunks, int *seconds);
104 * cleanup function of this audio format handler
106 * This close function should deallocate any resources
107 * associated with the current audio file. In particular, it is responsible
108 * for closing the file handle. It is assumed to succeed.
110 void (*close_audio_file)(void);
112 * jump to another position in the current audio file
114 * This is called if a client issued the ff or jmp command with \a request
115 * being the number of the next chunk that should be sent out. Must return a
116 * positive value on success and a negative value on errors.
118 int (*reposition_stream)(long unsigned request);
120 * function responsible for reading one data chunk.
122 * \a read_chunk() must return a pointer to the next chunk of data that should
123 * be sent out, or \p NULL on errors or if the end of the file was encountered.
125 * If it returns non-NULL, \a len must contain the length of the returned
126 * buffer (which may be zero if nothing has to be sent for some reason).
127 * Otherwise, \a len is used to distinguish between the eof and the error case:
128 * It must be zero in the eof case, or negative if an error occcured.
130 char * (*read_chunk)(long unsigned chunk_num, ssize_t *len);
134 void afs_send_chunk(void);
135 struct timeval *afs_preselect(void);
136 const char *audio_format_name(int);
137 unsigned int afs_playing(void);
138 unsigned int afs_next(void);
139 unsigned int afs_repos(void);
140 unsigned int afs_paused(void);