audio/wavcapture.c

   1 #include "hw/hw.h"
   2 #include "console.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. */
  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
  25 static void wav_notify (void *opaque, audcnotification_e cmd)
  26 {
  27     (void) opaque;
  28     (void) cmd;
  29 }
  30
  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
  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
  62 static void wav_capture_destroy (void *opaque)
  63 {
  64     WAVState *wav = opaque;
  65
  66     AUD_del_capture (wav->cap, wav);
  67 }
  68
  69 static void wav_capture_info (void *opaque)
  70 {
  71     WAVState *wav = opaque;
  72     char *path = wav->path;
  73
  74     term_printf ("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
  84 int wav_start_capture (CaptureState *s, const char *path, int freq,
  85                        int bits, int nchannels)
  86 {
  87     WAVState *wav;
  88     uint8_t hdr[] = {
  89         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
  90         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
  91         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
  92         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
  93     };
  94     struct audsettings as;
  95     struct audio_capture_ops ops;
  96     int stereo, bits16, shift;
  97     CaptureVoiceOut *cap;
  98
  99     if (bits != 8 && bits != 16) {
 100         term_printf ("incorrect bit count %d, must be 8 or 16\n", bits);
 101         return -1;
 102     }
 103
 104     if (nchannels != 1 && nchannels != 2) {
 105         term_printf ("incorrect channel count %d, must be 1 or 2\n",
 106                      nchannels);
 107         return -1;
 108     }
 109
 110     stereo = nchannels == 2;
 111     bits16 = bits == 16;
 112
 113     as.freq = freq;
 114     as.nchannels = 1 << stereo;
 115     as.fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8;
 116     as.endianness = 0;
 117
 118     ops.notify = wav_notify;
 119     ops.capture = wav_capture;
 120     ops.destroy = wav_destroy;
 121
 122     wav = qemu_mallocz (sizeof (*wav));
 123     if (!wav) {
 124         term_printf ("Could not allocate memory for wav capture (%zu bytes)",
 125                      sizeof (*wav));
 126         return -1;
 127     }
 128
 129     shift = bits16 + stereo;
 130     hdr[34] = bits16 ? 0x10 : 0x08;
 131
 132     le_store (hdr + 22, as.nchannels, 2);
 133     le_store (hdr + 24, freq, 4);
 134     le_store (hdr + 28, freq << shift, 4);
 135     le_store (hdr + 32, 1 << shift, 2);
 136
 137     wav->f = qemu_fopen (path, "wb");
 138     if (!wav->f) {
 139         term_printf ("Failed to open wave file `%s'\nReason: %s\n",
 140                      path, strerror (errno));
 141         qemu_free (wav);
 142         return -1;
 143     }
 144
 145     wav->path = qemu_strdup (path);
 146     wav->bits = bits;
 147     wav->nchannels = nchannels;
 148     wav->freq = freq;
 149
 150     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 151
 152     cap = AUD_add_capture (NULL, &as, &ops, wav);
 153     if (!cap) {
 154         term_printf ("Failed to add audio capture\n");
 155         qemu_free (wav->path);
 156         qemu_fclose (wav->f);
 157         qemu_free (wav);
 158         return -1;
 159     }
 160
 161     wav->cap = cap;
 162     s->opaque = wav;
 163     s->ops = wav_capture_ops;
 164     return 0;
 165 }