Move libnbaio out of AudioFlinger
libnbaio is now a separate shared library from AudioFlinger, rather
than a static library used only by AudioFlinger.
AudioBufferProvider interface is now also independent of AudioFlinger,
moved to include/media/
Change-Id: I9bb62ffbc38d42a38b0af76e66da5e9ab1e0e21b
diff --git a/media/libnbaio/LibsndfileSource.cpp b/media/libnbaio/LibsndfileSource.cpp
new file mode 100644
index 0000000..98610e0
--- /dev/null
+++ b/media/libnbaio/LibsndfileSource.cpp
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "LibsndfileSource"
+//#define LOG_NDEBUG 0
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+#include <media/nbaio/LibsndfileSource.h>
+
+namespace android {
+
+LibsndfileSource::LibsndfileSource(SNDFILE *sndfile, const SF_INFO &sfinfo, bool loop) :
+ NBAIO_Source(Format_from_SR_C(sfinfo.samplerate, sfinfo.channels)),
+ mSndfile(sndfile),
+ mEstimatedFramesUntilEOF(sfinfo.frames),
+ mLooping(loop && sfinfo.seekable),
+ mReadAnyFramesThisLoopCycle(false)
+{
+}
+
+LibsndfileSource::~LibsndfileSource()
+{
+ // do not close mSndfile; we don't own it
+}
+
+ssize_t LibsndfileSource::availableToRead()
+{
+ // after we reach the presumed EOF, report infinity just in case there's actually more
+ return !mLooping && mEstimatedFramesUntilEOF > 0 ? mEstimatedFramesUntilEOF : SSIZE_MAX;
+}
+
+ssize_t LibsndfileSource::read(void *buffer, size_t count)
+{
+ if (!mNegotiated) {
+ return (ssize_t) NEGOTIATE;
+ }
+ if (mSndfile == NULL) {
+ return (ssize_t) NO_INIT;
+ }
+ sf_count_t actual = sf_readf_short(mSndfile, (short *) buffer, (sf_count_t) count);
+ // Detect EOF by zero frames read, not by mFramesUntilEOF as it could be inaccurate
+ if (actual == 0) {
+ if (mLooping) {
+ if (mReadAnyFramesThisLoopCycle) {
+ (void) sf_seek(mSndfile, (sf_count_t) 0, SEEK_SET);
+ mReadAnyFramesThisLoopCycle = false;
+ } else {
+ // We didn't read any frames during the current loop cycle, so disable
+ // further looping to prevent the caller from busy waiting at read().
+ // This is especially important when looping an empty file.
+ mLooping = false;
+ }
+ }
+ } else {
+ mFramesRead += actual;
+ if (actual >= mEstimatedFramesUntilEOF) {
+ mEstimatedFramesUntilEOF = 0;
+ } else {
+ mEstimatedFramesUntilEOF -= actual;
+ }
+ mReadAnyFramesThisLoopCycle = true;
+ }
+ return actual;
+}
+
+} // namespace android