Archipelago » qemu

#include "hw/hw.h"

#include "console.h"

#include "audio.h"

typedef struct {

    QEMUFile *f;

    int bytes;

    char *path;

    int freq;

    int bits;

    int nchannels;

    CaptureVoiceOut *cap;

} WAVState;

/* VICE code: Store number as little endian. */

static void le_store (uint8_t *buf, uint32_t val, int len)

{

    int i;

    for (i = 0; i < len; i++) {

        buf[i] = (uint8_t) (val & 0xff);

        val >>= 8;

    }

}

static void wav_notify (void *opaque, audcnotification_e cmd)

{

    (void) opaque;

    (void) cmd;

}

static void wav_destroy (void *opaque)

{

    WAVState *wav = opaque;

    uint8_t rlen[4];

    uint8_t dlen[4];

    uint32_t datalen = wav->bytes;

    uint32_t rifflen = datalen + 36;

    if (wav->f) {

        le_store (rlen, rifflen, 4);

        le_store (dlen, datalen, 4);

        qemu_fseek (wav->f, 4, SEEK_SET);

        qemu_put_buffer (wav->f, rlen, 4);

        qemu_fseek (wav->f, 32, SEEK_CUR);

        qemu_put_buffer (wav->f, dlen, 4);

        qemu_fclose (wav->f);

    }

    qemu_free (wav->path);

}

static void wav_capture (void *opaque, void *buf, int size)

{

    WAVState *wav = opaque;

    qemu_put_buffer (wav->f, buf, size);

    wav->bytes += size;

}

static void wav_capture_destroy (void *opaque)

{

    WAVState *wav = opaque;

    AUD_del_capture (wav->cap, wav);

}

static void wav_capture_info (void *opaque)

{

    WAVState *wav = opaque;

    char *path = wav->path;

    term_printf ("Capturing audio(%d,%d,%d) to %s: %d bytes\n",

                 wav->freq, wav->bits, wav->nchannels,

                 path ? path : "<not available>", wav->bytes);

}

static struct capture_ops wav_capture_ops = {

    .destroy = wav_capture_destroy,

    .info = wav_capture_info

};

int wav_start_capture (CaptureState *s, const char *path, int freq,

                       int bits, int nchannels)

{

    WAVState *wav;

    uint8_t hdr[] = {

        0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,

        0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,

        0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,

        0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00

    };

    audsettings_t as;

    struct audio_capture_ops ops;

    int stereo, bits16, shift;

    CaptureVoiceOut *cap;

    if (bits != 8 && bits != 16) {

        term_printf ("incorrect bit count %d, must be 8 or 16\n", bits);

        return -1;

    }

    if (nchannels != 1 && nchannels != 2) {

        term_printf ("incorrect channel count %d, must be 1 or 2\n",

                     nchannels);

        return -1;

    }

    stereo = nchannels == 2;

    bits16 = bits == 16;

    as.freq = freq;

    as.nchannels = 1 << stereo;

    as.fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8;

    as.endianness = 0;

    ops.notify = wav_notify;

    ops.capture = wav_capture;

    ops.destroy = wav_destroy;

    wav = qemu_mallocz (sizeof (*wav));

    if (!wav) {

        term_printf ("Could not allocate memory for wav capture (%zu bytes)",

                     sizeof (*wav));

        return -1;

    }

    shift = bits16 + stereo;

    hdr[34] = bits16 ? 0x10 : 0x08;

    le_store (hdr + 22, as.nchannels, 2);

    le_store (hdr + 24, freq, 4);

    le_store (hdr + 28, freq << shift, 4);

    le_store (hdr + 32, 1 << shift, 2);

    wav->f = qemu_fopen (path, "wb");

    if (!wav->f) {

        term_printf ("Failed to open wave file `%s'\nReason: %s\n",

                     path, strerror (errno));

        qemu_free (wav);

        return -1;

    }

    wav->path = qemu_strdup (path);

    wav->bits = bits;

    wav->nchannels = nchannels;

    wav->freq = freq;

    qemu_put_buffer (wav->f, hdr, sizeof (hdr));

    cap = AUD_add_capture (NULL, &as, &ops, wav);

    if (!cap) {

        term_printf ("Failed to add audio capture\n");

        qemu_free (wav->path);

        qemu_fclose (wav->f);

        qemu_free (wav);

        return -1;

    }

    wav->cap = cap;

    s->opaque = wav;

    s->ops = wav_capture_ops;

    return 0;

}