root / audio / wavcapture.c @ 47dbd1f3
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#include "vl.h" |
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typedef struct { |
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QEMUFile *f; |
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int bytes;
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char *path;
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int freq;
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int bits;
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int nchannels;
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CaptureVoiceOut *cap; |
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} WAVState; |
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/* VICE code: Store number as little endian. */
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static void le_store (uint8_t *buf, uint32_t val, int len) |
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{ |
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int i;
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for (i = 0; i < len; i++) { |
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buf[i] = (uint8_t) (val & 0xff);
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val >>= 8;
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} |
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} |
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static void wav_notify (void *opaque, audcnotification_e cmd) |
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{ |
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(void) opaque;
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(void) cmd;
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} |
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static void wav_destroy (void *opaque) |
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{ |
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WAVState *wav = opaque; |
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uint8_t rlen[4];
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uint8_t dlen[4];
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uint32_t datalen = wav->bytes; |
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uint32_t rifflen = datalen + 36;
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if (!wav->f) {
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return;
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} |
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le_store (rlen, rifflen, 4);
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le_store (dlen, datalen, 4);
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qemu_fseek (wav->f, 4, SEEK_SET);
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qemu_put_buffer (wav->f, rlen, 4);
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qemu_fseek (wav->f, 32, SEEK_CUR);
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qemu_put_buffer (wav->f, dlen, 4);
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fclose (wav->f); |
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if (wav->path) {
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qemu_free (wav->path); |
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} |
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} |
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static void wav_capture (void *opaque, void *buf, int size) |
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{ |
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WAVState *wav = opaque; |
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qemu_put_buffer (wav->f, buf, size); |
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wav->bytes += size; |
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} |
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static void wav_capture_destroy (void *opaque) |
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{ |
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WAVState *wav = opaque; |
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AUD_del_capture (wav->cap, wav); |
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} |
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static void wav_capture_info (void *opaque) |
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{ |
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WAVState *wav = opaque; |
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char *path = wav->path;
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term_printf ("Capturing audio(%d,%d,%d) to %s: %d bytes\n",
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wav->freq, wav->bits, wav->nchannels, |
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path ? path : "<not available>", wav->bytes);
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} |
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static struct capture_ops wav_capture_ops = { |
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.destroy = wav_capture_destroy, |
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.info = wav_capture_info |
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}; |
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int wav_start_capture (CaptureState *s, const char *path, int freq, |
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int bits, int nchannels) |
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{ |
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WAVState *wav; |
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uint8_t hdr[] = { |
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0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56, |
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0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00, |
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0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04, |
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0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00 |
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}; |
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audsettings_t as; |
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struct audio_capture_ops ops;
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int stereo, bits16, shift;
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CaptureVoiceOut *cap; |
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if (bits != 8 && bits != 16) { |
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term_printf ("incorrect bit count %d, must be 8 or 16\n", bits);
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return -1; |
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} |
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if (nchannels != 1 && nchannels != 2) { |
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term_printf ("incorrect channel count %d, must be 1 or 2\n",
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nchannels); |
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return -1; |
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} |
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stereo = nchannels == 2;
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bits16 = bits == 16;
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as.freq = freq; |
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as.nchannels = 1 << stereo;
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as.fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8; |
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as.endianness = 0;
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ops.notify = wav_notify; |
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ops.capture = wav_capture; |
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ops.destroy = wav_destroy; |
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wav = qemu_mallocz (sizeof (*wav));
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if (!wav) {
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term_printf ("Could not allocate memory for wav capture (%zu bytes)",
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sizeof (*wav));
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return -1; |
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} |
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shift = bits16 + stereo; |
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hdr[34] = bits16 ? 0x10 : 0x08; |
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le_store (hdr + 22, as.nchannels, 2); |
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le_store (hdr + 24, freq, 4); |
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le_store (hdr + 28, freq << shift, 4); |
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le_store (hdr + 32, 1 << shift, 2); |
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wav->f = fopen (path, "wb");
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if (!wav->f) {
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term_printf ("Failed to open wave file `%s'\nReason: %s\n",
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path, strerror (errno)); |
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qemu_free (wav); |
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return -1; |
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} |
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wav->path = qemu_strdup (path); |
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wav->bits = bits; |
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wav->nchannels = nchannels; |
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wav->freq = freq; |
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qemu_put_buffer (wav->f, hdr, sizeof (hdr));
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cap = AUD_add_capture (NULL, &as, &ops, wav);
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if (!cap) {
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term_printf ("Failed to add audio capture\n");
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qemu_free (wav); |
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return -1; |
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} |
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wav->cap = cap; |
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s->opaque = wav; |
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s->ops = wav_capture_ops; |
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return 0; |
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} |