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authorbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2005-10-30 18:58:22 +0000
committerbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2005-10-30 18:58:22 +0000
commit1d14ffa97eacd3cb722271eaf6f093038396eac4 (patch)
tree1aae1f090262c3642cc672971890141050413d26 /audio/rate_template.h
parent3b0d4f61c917c4612b561d75b33a11f4da00738b (diff)
downloadqemu-arm-1d14ffa97eacd3cb722271eaf6f093038396eac4.tar.gz
merged 15a_aqemu.patch audio patch (malc)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1584 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'audio/rate_template.h')
-rw-r--r--audio/rate_template.h111
1 files changed, 111 insertions, 0 deletions
diff --git a/audio/rate_template.h b/audio/rate_template.h
new file mode 100644
index 0000000000..5cc95c829a
--- /dev/null
+++ b/audio/rate_template.h
@@ -0,0 +1,111 @@
+/*
+ * QEMU Mixing engine
+ *
+ * Copyright (c) 2004-2005 Vassili Karpov (malc)
+ * Copyright (c) 1998 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/*
+ * Processed signed long samples from ibuf to obuf.
+ * Return number of samples processed.
+ */
+void NAME (void *opaque, st_sample_t *ibuf, st_sample_t *obuf,
+ int *isamp, int *osamp)
+{
+ rate_t rate = (rate_t) opaque;
+ st_sample_t *istart, *iend;
+ st_sample_t *ostart, *oend;
+ st_sample_t ilast, icur, out;
+#ifdef FLOAT_MIXENG
+ real_t t;
+#else
+ int64_t t;
+#endif
+
+ ilast = rate->ilast;
+
+ istart = ibuf;
+ iend = ibuf + *isamp;
+
+ ostart = obuf;
+ oend = obuf + *osamp;
+
+ if (rate->opos_inc == (1ULL + UINT_MAX)) {
+ int i, n = *isamp > *osamp ? *osamp : *isamp;
+ for (i = 0; i < n; i++) {
+ OP (obuf[i].l, ibuf[i].r);
+ OP (obuf[i].r, ibuf[i].r);
+ }
+ *isamp = n;
+ *osamp = n;
+ return;
+ }
+
+ while (obuf < oend) {
+
+ /* Safety catch to make sure we have input samples. */
+ if (ibuf >= iend) {
+ break;
+ }
+
+ /* read as many input samples so that ipos > opos */
+
+ while (rate->ipos <= (rate->opos >> 32)) {
+ ilast = *ibuf++;
+ rate->ipos++;
+ /* See if we finished the input buffer yet */
+ if (ibuf >= iend) {
+ goto the_end;
+ }
+ }
+
+ icur = *ibuf;
+
+ /* interpolate */
+#ifdef FLOAT_MIXENG
+#ifdef RECIPROCAL
+ t = (rate->opos & UINT_MAX) * (1.f / UINT_MAX);
+#else
+ t = (rate->opos & UINT_MAX) / (real_t) UINT_MAX;
+#endif
+ out.l = (ilast.l * (1.0 - t)) + icur.l * t;
+ out.r = (ilast.r * (1.0 - t)) + icur.r * t;
+#else
+ t = rate->opos & 0xffffffff;
+ out.l = (ilast.l * ((int64_t) UINT_MAX - t) + icur.l * t) >> 32;
+ out.r = (ilast.r * ((int64_t) UINT_MAX - t) + icur.r * t) >> 32;
+#endif
+
+ /* output sample & increment position */
+ OP (obuf->l, out.l);
+ OP (obuf->r, out.r);
+ obuf += 1;
+ rate->opos += rate->opos_inc;
+ }
+
+the_end:
+ *isamp = ibuf - istart;
+ *osamp = obuf - ostart;
+ rate->ilast = ilast;
+}
+
+#undef NAME
+#undef OP