Use callbacks for Midi I/O

Instead of having the Sonivox engine directly open the file and
use stdio to read from it, use caller-provided callbacks.

Change-Id: I4d775c8458c48c591a15794c4517e006dcf034e1

3 files changed, 82 insertions, 21 deletions

diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index bcec9c9..c58a503 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -42,6 +42,7 @@ LOCAL_SRC_FILES:= \
     mediarecorder.cpp \
     IMediaMetadataRetriever.cpp \
     mediametadataretriever.cpp \
+    MidiIoWrapper.cpp \
     ToneGenerator.cpp \
     JetPlayer.cpp \
     IOMX.cpp \
diff --git a/media/libmedia/JetPlayer.cpp b/media/libmedia/JetPlayer.cpp
index f0f1832..721d8d7 100644
--- a/media/libmedia/JetPlayer.cpp
+++ b/media/libmedia/JetPlayer.cpp
@@ -36,7 +36,6 @@ JetPlayer::JetPlayer(void *javaJetPlayer, int maxTracks, int trackBufferSize) :
         mPaused(false),
         mMaxTracks(maxTracks),
         mEasData(NULL),
-        mEasJetFileLoc(NULL),
         mTrackBufferSize(trackBufferSize)
 {
     ALOGV("JetPlayer constructor");
@@ -133,10 +132,7 @@ int JetPlayer::release()
         JET_Shutdown(mEasData);
         EAS_Shutdown(mEasData);
     }
-    if (mEasJetFileLoc) {
-        free(mEasJetFileLoc);
-        mEasJetFileLoc = NULL;
-    }
+    mIoWrapper.clear();
     if (mAudioTrack != 0) {
         mAudioTrack->stop();
         mAudioTrack->flush();
@@ -327,16 +323,9 @@ int JetPlayer::loadFromFile(const char* path)
 
     Mutex::Autolock lock(mMutex);
 
-    mEasJetFileLoc = (EAS_FILE_LOCATOR) malloc(sizeof(EAS_FILE));
-    strncpy(mJetFilePath, path, sizeof(mJetFilePath));
-    mJetFilePath[sizeof(mJetFilePath) - 1] = '\0';
-    mEasJetFileLoc->path = mJetFilePath;
-
-    mEasJetFileLoc->fd = 0;
-    mEasJetFileLoc->length = 0;
-    mEasJetFileLoc->offset = 0;
+    mIoWrapper = new MidiIoWrapper(path);
 
-    EAS_RESULT result = JET_OpenFile(mEasData, mEasJetFileLoc);
+    EAS_RESULT result = JET_OpenFile(mEasData, mIoWrapper->getLocator());
     if (result != EAS_SUCCESS)
         mState = EAS_STATE_ERROR;
     else
@@ -352,13 +341,9 @@ int JetPlayer::loadFromFD(const int fd, const long long offset, const long long
 
     Mutex::Autolock lock(mMutex);
 
-    mEasJetFileLoc = (EAS_FILE_LOCATOR) malloc(sizeof(EAS_FILE));
-    mEasJetFileLoc->fd = fd;
-    mEasJetFileLoc->offset = offset;
-    mEasJetFileLoc->length = length;
-    mEasJetFileLoc->path = NULL;
+    mIoWrapper = new MidiIoWrapper(fd, offset, length);
 
-    EAS_RESULT result = JET_OpenFile(mEasData, mEasJetFileLoc);
+    EAS_RESULT result = JET_OpenFile(mEasData, mIoWrapper->getLocator());
     if (result != EAS_SUCCESS)
         mState = EAS_STATE_ERROR;
     else
@@ -459,7 +444,6 @@ int JetPlayer::clearQueue()
 //-------------------------------------------------------------------------------------------------
 void JetPlayer::dump()
 {
-    ALOGE("JetPlayer dump: JET file=%s", mEasJetFileLoc->path);
 }
 
 void JetPlayer::dumpJetStatus(S_JET_STATUS* pJetStatus)
diff --git a/media/libmedia/MidiIoWrapper.cpp b/media/libmedia/MidiIoWrapper.cpp
new file mode 100644
index 0000000..ef931d2
--- /dev/null
+++ b/media/libmedia/MidiIoWrapper.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2014 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_NDEBUG 0
+#define LOG_TAG "MidiIoWrapper"
+#include <utils/Log.h>
+#include <utils/RefBase.h>
+
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "media/MidiIoWrapper.h"
+
+static int readAt(void *handle, void *buffer, int pos, int size) {
+    return ((android::MidiIoWrapper*)handle)->readAt(buffer, pos, size);
+}
+static int size(void *handle) {
+    return ((android::MidiIoWrapper*)handle)->size();
+}
+
+namespace android {
+
+MidiIoWrapper::MidiIoWrapper(const char *path) {
+    ALOGV("MidiIoWrapper(%s)", path);
+    mFd = open(path, O_RDONLY | O_LARGEFILE);
+    mBase = 0;
+    mLength = lseek(mFd, 0, SEEK_END);
+}
+
+MidiIoWrapper::MidiIoWrapper(int fd, off64_t offset, int64_t size) {
+    ALOGV("MidiIoWrapper(fd=%d)", fd);
+    mFd = dup(fd);
+    mBase = offset;
+    mLength = size;
+}
+
+MidiIoWrapper::~MidiIoWrapper() {
+    ALOGV("~MidiIoWrapper");
+    close(mFd);
+}
+
+int MidiIoWrapper::readAt(void *buffer, int offset, int size) {
+    ALOGV("readAt(%p, %d, %d)", buffer, offset, size);
+    lseek(mFd, mBase + offset, SEEK_SET);
+    if (offset + size > mLength) {
+        size = mLength - offset;
+    }
+    return read(mFd, buffer, size);
+}
+
+int MidiIoWrapper::size() {
+    ALOGV("size() = %d", mLength);
+    return mLength;
+}
+
+EAS_FILE_LOCATOR MidiIoWrapper::getLocator() {
+    mEasFile.handle = this;
+    mEasFile.readAt = ::readAt;
+    mEasFile.size = ::size;
+    return &mEasFile;
+}
+
+}  // namespace android