1 files changed, 99 insertions, 0 deletions
diff --git a/polyp/sample.c b/polyp/sample.c
new file mode 100644
index 00000000..8179475d
--- /dev/null
+++ b/polyp/sample.c
@@ -0,0 +1,99 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+ 
+  polypaudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+ 
+  You should have received a copy of the GNU General Public License
+  along with polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <assert.h>
+
+#include "sample.h"
+
+size_t pa_sample_size(const struct pa_sample_spec *spec) {
+    assert(spec);
+    size_t b = 1;
+
+    switch (spec->format) {
+        case PA_SAMPLE_U8:
+        case PA_SAMPLE_ULAW:
+        case PA_SAMPLE_ALAW:
+            b = 1;
+            break;
+        case PA_SAMPLE_S16LE:
+        case PA_SAMPLE_S16BE:
+            b = 2;
+            break;
+        case PA_SAMPLE_FLOAT32LE:
+        case PA_SAMPLE_FLOAT32BE:
+            b = 4;
+            break;
+        default:
+            assert(0);
+    }
+
+    return b * spec->channels;
+}
+
+size_t pa_bytes_per_second(const struct pa_sample_spec *spec) {
+    assert(spec);
+    return spec->rate*pa_sample_size(spec);
+}
+
+
+uint32_t pa_samples_usec(size_t length, const struct pa_sample_spec *spec) {
+    assert(spec);
+
+    return (uint32_t) (((double) length /pa_sample_size(spec))/spec->rate*1000000);
+}
+
+int pa_sample_spec_valid(const struct pa_sample_spec *spec) {
+    assert(spec);
+
+    if (!spec->rate || !spec->channels)
+        return 0;
+
+    if (spec->format >= PA_SAMPLE_MAX)
+        return 0;
+
+    return 1;
+}
+
+int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b) {
+    assert(a && b);
+
+    return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
+}
+
+void pa_sample_snprint(char *s, size_t l, const struct pa_sample_spec *spec) {
+    static const char* const table[]= {
+        [PA_SAMPLE_U8] = "U8",
+        [PA_SAMPLE_ALAW] = "ALAW",
+        [PA_SAMPLE_ULAW] = "ULAW",
+        [PA_SAMPLE_S16LE] = "S16LE",
+        [PA_SAMPLE_S16BE] = "S16BE",
+        [PA_SAMPLE_FLOAT32LE] = "FLOAT32LE",
+        [PA_SAMPLE_FLOAT32BE] = "FLOAT32BE",
+    };
+
+    assert(pa_sample_spec_valid(spec));
+    snprintf(s, l, "%s %uch %uHz", table[spec->format], spec->channels, spec->rate);
+}