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/NBAIO.cpp b/media/libnbaio/NBAIO.cpp
new file mode 100644
index 0000000..00d2017
--- /dev/null
+++ b/media/libnbaio/NBAIO.cpp
@@ -0,0 +1,190 @@
+/*
+ * 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 "NBAIO"
+//#define LOG_NDEBUG 0
+
+#include <utils/Log.h>
+#include <media/nbaio/NBAIO.h>
+
+namespace android {
+
+size_t Format_frameSize(NBAIO_Format format)
+{
+ switch (format) {
+ case Format_SR44_1_C2_I16:
+ case Format_SR48_C2_I16:
+ return 2 * sizeof(short);
+ case Format_SR44_1_C1_I16:
+ case Format_SR48_C1_I16:
+ return 1 * sizeof(short);
+ case Format_Invalid:
+ default:
+ return 0;
+ }
+}
+
+size_t Format_frameBitShift(NBAIO_Format format)
+{
+ switch (format) {
+ case Format_SR44_1_C2_I16:
+ case Format_SR48_C2_I16:
+ return 2; // 1 << 2 == 2 * sizeof(short)
+ case Format_SR44_1_C1_I16:
+ case Format_SR48_C1_I16:
+ return 1; // 1 << 1 == 1 * sizeof(short)
+ case Format_Invalid:
+ default:
+ return 0;
+ }
+}
+
+unsigned Format_sampleRate(NBAIO_Format format)
+{
+ switch (format) {
+ case Format_SR44_1_C1_I16:
+ case Format_SR44_1_C2_I16:
+ return 44100;
+ case Format_SR48_C1_I16:
+ case Format_SR48_C2_I16:
+ return 48000;
+ case Format_Invalid:
+ default:
+ return 0;
+ }
+}
+
+unsigned Format_channelCount(NBAIO_Format format)
+{
+ switch (format) {
+ case Format_SR44_1_C1_I16:
+ case Format_SR48_C1_I16:
+ return 1;
+ case Format_SR44_1_C2_I16:
+ case Format_SR48_C2_I16:
+ return 2;
+ case Format_Invalid:
+ default:
+ return 0;
+ }
+}
+
+NBAIO_Format Format_from_SR_C(unsigned sampleRate, unsigned channelCount)
+{
+ if (sampleRate == 44100 && channelCount == 2) return Format_SR44_1_C2_I16;
+ if (sampleRate == 48000 && channelCount == 2) return Format_SR48_C2_I16;
+ if (sampleRate == 44100 && channelCount == 1) return Format_SR44_1_C1_I16;
+ if (sampleRate == 48000 && channelCount == 1) return Format_SR48_C1_I16;
+ return Format_Invalid;
+}
+
+// This is a default implementation; it is expected that subclasses will optimize this.
+ssize_t NBAIO_Sink::writeVia(writeVia_t via, size_t total, void *user, size_t block)
+{
+ if (!mNegotiated) {
+ return (ssize_t) NEGOTIATE;
+ }
+ static const size_t maxBlock = 32;
+ size_t frameSize = Format_frameSize(mFormat);
+ ALOG_ASSERT(frameSize > 0 && frameSize <= 8);
+ // double guarantees alignment for stack similar to what malloc() gives for heap
+ if (block == 0 || block > maxBlock) {
+ block = maxBlock;
+ }
+ double buffer[((frameSize * block) + sizeof(double) - 1) / sizeof(double)];
+ size_t accumulator = 0;
+ while (accumulator < total) {
+ size_t count = total - accumulator;
+ if (count > block) {
+ count = block;
+ }
+ ssize_t ret = via(user, buffer, count);
+ if (ret > 0) {
+ ALOG_ASSERT((size_t) ret <= count);
+ size_t maxRet = ret;
+ ret = write(buffer, maxRet);
+ if (ret > 0) {
+ ALOG_ASSERT((size_t) ret <= maxRet);
+ accumulator += ret;
+ continue;
+ }
+ }
+ return accumulator > 0 ? accumulator : ret;
+ }
+ return accumulator;
+}
+
+// This is a default implementation; it is expected that subclasses will optimize this.
+ssize_t NBAIO_Source::readVia(readVia_t via, size_t total, void *user,
+ int64_t readPTS, size_t block)
+{
+ if (!mNegotiated) {
+ return (ssize_t) NEGOTIATE;
+ }
+ static const size_t maxBlock = 32;
+ size_t frameSize = Format_frameSize(mFormat);
+ ALOG_ASSERT(frameSize > 0 && frameSize <= 8);
+ // double guarantees alignment for stack similar to what malloc() gives for heap
+ if (block == 0 || block > maxBlock) {
+ block = maxBlock;
+ }
+ double buffer[((frameSize * block) + sizeof(double) - 1) / sizeof(double)];
+ size_t accumulator = 0;
+ while (accumulator < total) {
+ size_t count = total - accumulator;
+ if (count > block) {
+ count = block;
+ }
+ ssize_t ret = read(buffer, count, readPTS);
+ if (ret > 0) {
+ ALOG_ASSERT((size_t) ret <= count);
+ size_t maxRet = ret;
+ ret = via(user, buffer, maxRet, readPTS);
+ if (ret > 0) {
+ ALOG_ASSERT((size_t) ret <= maxRet);
+ accumulator += ret;
+ continue;
+ }
+ }
+ return accumulator > 0 ? accumulator : ret;
+ }
+ return accumulator;
+}
+
+// Default implementation that only accepts my mFormat
+ssize_t NBAIO_Port::negotiate(const NBAIO_Format offers[], size_t numOffers,
+ NBAIO_Format counterOffers[], size_t& numCounterOffers)
+{
+ ALOGV("negotiate offers=%p numOffers=%u countersOffers=%p numCounterOffers=%u",
+ offers, numOffers, counterOffers, numCounterOffers);
+ if (mFormat != Format_Invalid) {
+ for (size_t i = 0; i < numOffers; ++i) {
+ if (offers[i] == mFormat) {
+ mNegotiated = true;
+ return i;
+ }
+ }
+ if (numCounterOffers > 0) {
+ counterOffers[0] = mFormat;
+ }
+ numCounterOffers = 1;
+ } else {
+ numCounterOffers = 0;
+ }
+ return (ssize_t) NEGOTIATE;
+}
+
+} // namespace android