audio/wavcapture.c

   1 #include "vl.h"
   2
   3 typedef struct {
   4     QEMUFile *f;
   5     int bytes;
   6     char *path;
   7     int freq;
   8     int bits;
   9     int nchannels;
  10     CaptureVoiceOut *cap;
  11 } WAVState;
  12
  13 /* VICE code: Store number as little endian. */
  14 static void le_store (uint8_t *buf, uint32_t val, int len)
  15 {
  16     int i;
  17     for (i = 0; i < len; i++) {
  18         buf[i] = (uint8_t) (val & 0xff);
  19         val >>= 8;
  20     }
  21 }
  22
  23 static void wav_notify (void *opaque, audcnotification_e cmd)
  24 {
  25     (void) opaque;
  26     (void) cmd;
  27 }
  28
  29 static void wav_destroy (void *opaque)
  30 {
  31     WAVState *wav = opaque;
  32     uint8_t rlen[4];
  33     uint8_t dlen[4];
  34     uint32_t datalen = wav->bytes;
  35     uint32_t rifflen = datalen + 36;
  36
  37     if (!wav->f) {
  38         return;
  39     }
  40
  41     le_store (rlen, rifflen, 4);
  42     le_store (dlen, datalen, 4);
  43
  44     qemu_fseek (wav->f, 4, SEEK_SET);
  45     qemu_put_buffer (wav->f, rlen, 4);
  46
  47     qemu_fseek (wav->f, 32, SEEK_CUR);
  48     qemu_put_buffer (wav->f, dlen, 4);
  49     fclose (wav->f);
  50     if (wav->path) {
  51         qemu_free (wav->path);
  52     }
  53 }
  54
  55 static void wav_capture (void *opaque, void *buf, int size)
  56 {
  57     WAVState *wav = opaque;
  58
  59     qemu_put_buffer (wav->f, buf, size);
  60     wav->bytes += size;
  61 }
  62
  63 static void wav_capture_destroy (void *opaque)
  64 {
  65     WAVState *wav = opaque;
  66
  67     AUD_del_capture (wav->cap, wav);
  68 }
  69
  70 static void wav_capture_info (void *opaque)
  71 {
  72     WAVState *wav = opaque;
  73     char *path = wav->path;
  74
  75     term_printf ("Capturing audio(%d,%d,%d) to %s: %d bytes\n",
  76                  wav->freq, wav->bits, wav->nchannels,
  77                  path ? path : "<not available>", wav->bytes);
  78 }
  79
  80 static struct capture_ops wav_capture_ops = {
  81     .destroy = wav_capture_destroy,
  82     .info = wav_capture_info
  83 };
  84
  85 int wav_start_capture (CaptureState *s, const char *path, int freq,
  86                        int bits, int nchannels)
  87 {
  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     audsettings_t as;
  96     struct audio_capture_ops ops;
  97     int stereo, bits16, shift;
  98     CaptureVoiceOut *cap;
  99
 100     if (bits != 8 && bits != 16) {
 101         term_printf ("incorrect bit count %d, must be 8 or 16\n", bits);
 102         return -1;
 103     }
 104
 105     if (nchannels != 1 && nchannels != 2) {
 106         term_printf ("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     if (!wav) {
 125         term_printf ("Could not allocate memory for wav capture (%zu bytes)",
 126                      sizeof (*wav));
 127         return -1;
 128     }
 129
 130     shift = bits16 + stereo;
 131     hdr[34] = bits16 ? 0x10 : 0x08;
 132
 133     le_store (hdr + 22, as.nchannels, 2);
 134     le_store (hdr + 24, freq, 4);
 135     le_store (hdr + 28, freq << shift, 4);
 136     le_store (hdr + 32, 1 << shift, 2);
 137
 138     wav->f = fopen (path, "wb");
 139     if (!wav->f) {
 140         term_printf ("Failed to open wave file `%s'\nReason: %s\n",
 141                      path, strerror (errno));
 142         qemu_free (wav);
 143         return -1;
 144     }
 145
 146     wav->path = qemu_strdup (path);
 147     wav->bits = bits;
 148     wav->nchannels = nchannels;
 149     wav->freq = freq;
 150
 151     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 152
 153     cap = AUD_add_capture (NULL, &as, &ops, wav);
 154     if (!cap) {
 155         term_printf ("Failed to add audio capture\n");
 156         qemu_free (wav);
 157         return -1;
 158     }
 159
 160     wav->cap = cap;
 161     s->opaque = wav;
 162     s->ops = wav_capture_ops;
 163     return 0;
 164 }