examples/test.c


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

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sysexits.h>
#include <fcntl.h>
#include <math.h>

#include <xas/synth.h>
#include <xas/audio.h>
#include <xas/mixer.h>
#include <xas/riff.h>

static void usage(int argc, char **argv, const char *message, ...) {
    va_list args;

    va_start(args, message);

    if (message) {
        vfprintf(stderr, message, args);
        fputc('\n', stderr);
    }

    va_end(args);

    fprintf(stderr, "usage: %s output.wav\n", argv[0]);

    exit(EX_USAGE);
}

int main(int argc, char **argv) {
    xas_mixer *mixer;

    xas_audio_stream *synth_l,
                       *synth_r,
                       *wave;

    xas_synth *sine_l,
                *sine_r;

    xas_audio_format format = {
        .channels    = XAS_AUDIO_STEREO,
        .sample_size = XAS_AUDIO_PCM_16_BIT,
        .sample_rate = 44100
    };

    size_t buffer_size =  4096,
           duration_s  =    60,
           i;

    if (argc != 2) {
        usage(argc, argv, "No output file provided");
    }

    if ((wave = xas_riff_new_file(argv[1],
                                    format,
                                    O_WRONLY | O_CREAT | O_TRUNC)) == NULL) {
        goto error_riff_new_file;
    }

    if ((sine_l = xas_synth_new(format,
                                   buffer_size,
                                   XAS_SYNTH_SINE)) == NULL) {
        goto error_synth_new_l;
    }

    if ((synth_l = xas_synth_stream_new(sine_l)) == NULL) {
        goto error_synth_stream_new_l;
    }

    if ((sine_r = xas_synth_new(format,
                                   buffer_size,
                                   XAS_SYNTH_SINE)) == NULL) {
        goto error_synth_new_r;
    }

    if ((synth_r = xas_synth_stream_new(sine_r)) == NULL) {
        goto error_synth_stream_new_r;
    }

    if ((mixer = xas_mixer_new(format, buffer_size)) == NULL) {
        goto error_mixer_new;
    }

    if (xas_mixer_input_add(mixer, synth_l, 0.3, -1.0) == NULL) {
        goto error_mixer_input_add;
    }

    if (xas_mixer_input_add(mixer, synth_r, 0.3, 1.0) == NULL) {
        goto error_mixer_input_add;
    }

    xas_synth_set_frequency(sine_l, 2600);
    xas_synth_start(sine_l);

    xas_synth_set_frequency(sine_r, 420);
    xas_synth_start(sine_r);

    for (i=0; i<duration_s; i++) {
        void *buf;
        ssize_t readlen;

        if ((readlen = xas_audio_stream_read(mixer->output,
                                               &buf,
                                               buffer_size)) < 0) {
            goto error_audio_stream_read;
        }

        if (xas_audio_stream_write(wave, buf, readlen) < 0) {
            goto error_audio_stream_write;
        }
    }

    xas_audio_stream_flush(wave);

    xas_mixer_destroy(mixer);
    xas_audio_stream_destroy(synth_r);
    xas_synth_destroy(sine_r);
    xas_audio_stream_destroy(synth_l);
    xas_synth_destroy(sine_l);
    xas_audio_stream_destroy(wave);

    return EX_OK;

error_audio_stream_write:
error_audio_stream_read:
error_mixer_input_add:
    xas_mixer_destroy(mixer);

error_mixer_new:
    xas_audio_stream_destroy(synth_r);

error_synth_stream_new_r:
    xas_synth_destroy(sine_r);

error_synth_new_r:
    xas_audio_stream_destroy(synth_l);

error_synth_stream_new_l:
    xas_synth_destroy(sine_l);

error_synth_new_l:
    xas_audio_stream_destroy(wave);

error_riff_new_file:
    return EX_OSERR;
}