summaryrefslogtreecommitdiffstats
path: root/polyp/module-pipe-source.c
blob: e8a17b96226958508eb67e2b8ce5269cc7e61f3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/* $Id$ */

/***
  This file is part of polypaudio.
 
  polypaudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.
 
  polypaudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  along with polypaudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <sys/stat.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>

#include "iochannel.h"
#include "source.h"
#include "module.h"
#include "util.h"
#include "modargs.h"
#include "xmalloc.h"
#include "log.h"
#include "module-pipe-source-symdef.h"

PA_MODULE_AUTHOR("Lennart Poettering")
PA_MODULE_DESCRIPTION("UNIX pipe source")
PA_MODULE_VERSION(PACKAGE_VERSION)
PA_MODULE_USAGE("source_name=<name for the source> file=<path of the FIFO> format=<sample format> channels=<number of channels> rate=<sample rate>")

#define DEFAULT_FIFO_NAME "/tmp/music.input"
#define DEFAULT_SOURCE_NAME "fifo_input"

struct userdata {
    struct pa_core *core;

    char *filename;
    
    struct pa_source *source;
    struct pa_iochannel *io;
    struct pa_module *module;
    struct pa_memchunk chunk;
};

static const char* const valid_modargs[] = {
    "file",
    "rate",
    "channels",
    "format",
    "source_name",
    NULL
};

static void do_read(struct userdata *u) {
    ssize_t r;
    struct pa_memchunk chunk;
    assert(u);

    if (!pa_iochannel_is_readable(u->io))
        return;

    pa_module_set_used(u->module, pa_idxset_ncontents(u->source->outputs));

    if (!u->chunk.memblock) {
        u->chunk.memblock = pa_memblock_new(1024, u->core->memblock_stat);
        u->chunk.index = chunk.length = 0;
    }

    assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
    if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
        pa_log(__FILE__": read() failed: %s\n", strerror(errno));
        return;
    }

    u->chunk.length = r;
    pa_source_post(u->source, &u->chunk);
    u->chunk.index += r;

    if (u->chunk.index >= u->chunk.memblock->length) {
        u->chunk.index = u->chunk.length = 0;
        pa_memblock_unref(u->chunk.memblock);
        u->chunk.memblock = NULL;
    }
}

static void io_callback(struct pa_iochannel *io, void*userdata) {
    struct userdata *u = userdata;
    assert(u);
    do_read(u);
}

int pa__init(struct pa_core *c, struct pa_module*m) {
    struct userdata *u = NULL;
    struct stat st;
    const char *p;
    int fd = -1;
    struct pa_sample_spec ss;
    struct pa_modargs *ma = NULL;
    assert(c && m);
    
    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log(__FILE__": failed to parse module arguments\n");
        goto fail;
    }

    ss = c->default_sample_spec;
    if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
        pa_log(__FILE__": invalid sample format specification\n");
        goto fail;
    }
    
    mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);

    if ((fd = open(p, O_RDWR)) < 0) {
        pa_log(__FILE__": open('%s'): %s\n", p, strerror(errno));
        goto fail;
    }

    pa_fd_set_cloexec(fd, 1);
    
    if (fstat(fd, &st) < 0) {
        pa_log(__FILE__": fstat('%s'): %s\n", p, strerror(errno));
        goto fail;
    }

    if (!S_ISFIFO(st.st_mode)) {
        pa_log(__FILE__": '%s' is not a FIFO.\n", p);
        goto fail;
    }

    u = pa_xmalloc0(sizeof(struct userdata));

    u->filename = pa_xstrdup(p);
    u->core = c;
    
    if (!(u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss))) {
        pa_log(__FILE__": failed to create source.\n");
        goto fail;
    }
    u->source->userdata = u;
    pa_source_set_owner(u->source, m);
    u->source->description = pa_sprintf_malloc("Unix FIFO source '%s'", p);
    assert(u->source->description);

    u->io = pa_iochannel_new(c->mainloop, fd, -1);
    assert(u->io);
    pa_iochannel_set_callback(u->io, io_callback, u);

    u->chunk.memblock = NULL;
    u->chunk.index = u->chunk.length = 0;
    
    u->module = m;
    m->userdata = u;

    pa_modargs_free(ma);
    
    return 0;

fail:
    if (ma)
        pa_modargs_free(ma);
        
    if (fd >= 0)
        close(fd);

    pa__done(c, m);

    return -1;
}

void pa__done(struct pa_core *c, struct pa_module*m) {
    struct userdata *u;
    assert(c && m);

    if (!(u = m->userdata))
        return;
    
    if (u->chunk.memblock)
        pa_memblock_unref(u->chunk.memblock);
        
    pa_source_disconnect(u->source);
    pa_source_unref(u->source);
    pa_iochannel_free(u->io);

    assert(u->filename);
    unlink(u->filename);
    pa_xfree(u->filename);
    
    pa_xfree(u);
}