xref: /illumos-kvm-cmd/audio/wavcapture.c (revision 68396ea9)
1 #include "hw/hw.h"
2 #include "monitor.h"
3 #include "audio.h"
4 
5 typedef struct {
6     QEMUFile *f;
7     int bytes;
8     char *path;
9     int freq;
10     int bits;
11     int nchannels;
12     CaptureVoiceOut *cap;
13 } WAVState;
14 
15 /* VICE code: Store number as little endian. */
le_store(uint8_t * buf,uint32_t val,int len)16 static void le_store (uint8_t *buf, uint32_t val, int len)
17 {
18     int i;
19     for (i = 0; i < len; i++) {
20         buf[i] = (uint8_t) (val & 0xff);
21         val >>= 8;
22     }
23 }
24 
wav_notify(void * opaque,audcnotification_e cmd)25 static void wav_notify (void *opaque, audcnotification_e cmd)
26 {
27     (void) opaque;
28     (void) cmd;
29 }
30 
wav_destroy(void * opaque)31 static void wav_destroy (void *opaque)
32 {
33     WAVState *wav = opaque;
34     uint8_t rlen[4];
35     uint8_t dlen[4];
36     uint32_t datalen = wav->bytes;
37     uint32_t rifflen = datalen + 36;
38 
39     if (wav->f) {
40         le_store (rlen, rifflen, 4);
41         le_store (dlen, datalen, 4);
42 
43         qemu_fseek (wav->f, 4, SEEK_SET);
44         qemu_put_buffer (wav->f, rlen, 4);
45 
46         qemu_fseek (wav->f, 32, SEEK_CUR);
47         qemu_put_buffer (wav->f, dlen, 4);
48         qemu_fclose (wav->f);
49     }
50 
51     qemu_free (wav->path);
52 }
53 
wav_capture(void * opaque,void * buf,int size)54 static void wav_capture (void *opaque, void *buf, int size)
55 {
56     WAVState *wav = opaque;
57 
58     qemu_put_buffer (wav->f, buf, size);
59     wav->bytes += size;
60 }
61 
wav_capture_destroy(void * opaque)62 static void wav_capture_destroy (void *opaque)
63 {
64     WAVState *wav = opaque;
65 
66     AUD_del_capture (wav->cap, wav);
67 }
68 
wav_capture_info(void * opaque)69 static void wav_capture_info (void *opaque)
70 {
71     WAVState *wav = opaque;
72     char *path = wav->path;
73 
74     monitor_printf(cur_mon, "Capturing audio(%d,%d,%d) to %s: %d bytes\n",
75                    wav->freq, wav->bits, wav->nchannels,
76                    path ? path : "<not available>", wav->bytes);
77 }
78 
79 static struct capture_ops wav_capture_ops = {
80     .destroy = wav_capture_destroy,
81     .info = wav_capture_info
82 };
83 
wav_start_capture(CaptureState * s,const char * path,int freq,int bits,int nchannels)84 int wav_start_capture (CaptureState *s, const char *path, int freq,
85                        int bits, int nchannels)
86 {
87     Monitor *mon = cur_mon;
88     WAVState *wav;
89     uint8_t hdr[] = {
90         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
91         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
92         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
93         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
94     };
95     struct audsettings as;
96     struct audio_capture_ops ops;
97     int stereo, bits16, shift;
98     CaptureVoiceOut *cap;
99 
100     if (bits != 8 && bits != 16) {
101         monitor_printf(mon, "incorrect bit count %d, must be 8 or 16\n", bits);
102         return -1;
103     }
104 
105     if (nchannels != 1 && nchannels != 2) {
106         monitor_printf(mon, "incorrect channel count %d, must be 1 or 2\n",
107                        nchannels);
108         return -1;
109     }
110 
111     stereo = nchannels == 2;
112     bits16 = bits == 16;
113 
114     as.freq = freq;
115     as.nchannels = 1 << stereo;
116     as.fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8;
117     as.endianness = 0;
118 
119     ops.notify = wav_notify;
120     ops.capture = wav_capture;
121     ops.destroy = wav_destroy;
122 
123     wav = qemu_mallocz (sizeof (*wav));
124 
125     shift = bits16 + stereo;
126     hdr[34] = bits16 ? 0x10 : 0x08;
127 
128     le_store (hdr + 22, as.nchannels, 2);
129     le_store (hdr + 24, freq, 4);
130     le_store (hdr + 28, freq << shift, 4);
131     le_store (hdr + 32, 1 << shift, 2);
132 
133     wav->f = qemu_fopen (path, "wb");
134     if (!wav->f) {
135         monitor_printf(mon, "Failed to open wave file `%s'\nReason: %s\n",
136                        path, strerror (errno));
137         qemu_free (wav);
138         return -1;
139     }
140 
141     wav->path = qemu_strdup (path);
142     wav->bits = bits;
143     wav->nchannels = nchannels;
144     wav->freq = freq;
145 
146     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
147 
148     cap = AUD_add_capture (&as, &ops, wav);
149     if (!cap) {
150         monitor_printf(mon, "Failed to add audio capture\n");
151         qemu_free (wav->path);
152         qemu_fclose (wav->f);
153         qemu_free (wav);
154         return -1;
155     }
156 
157     wav->cap = cap;
158     s->opaque = wav;
159     s->ops = wav_capture_ops;
160     return 0;
161 }
162