Expose SampleFormat -> bytes per frame calculations.

First part of converting audio streams to reduce copying the data.

BUG=248989

Review URL: https://chromiumcodereview.appspot.com/16404013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205937 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 32 insertions, 0 deletions

diff --git a/media/base/sample_format.cc b/media/base/sample_format.cc
new file mode 100644
index 0000000..3fdcf101
--- /dev/null
+++ b/media/base/sample_format.cc
@@ -0,0 +1,32 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/base/sample_format.h"
+
+#include "base/logging.h"
+
+namespace media {
+
+int SampleFormatToBytesPerChannel(SampleFormat sample_format) {
+  switch (sample_format) {
+    case kUnknownSampleFormat:
+      return 0;
+    case kSampleFormatU8:
+      return 1;
+    case kSampleFormatS16:
+    case kSampleFormatPlanarS16:
+      return 2;
+    case kSampleFormatS32:
+    case kSampleFormatF32:
+    case kSampleFormatPlanarF32:
+      return 4;
+    case kSampleFormatMax:
+      break;
+  }
+
+  NOTREACHED() << "Invalid sample format provided: " << sample_format;
+  return 0;
+}
+
+}  // namespace media