Replace MidiFile player with a Midi extractor

This gets rids of a bunch of special midi handling and replaces it
with an extractor that works with NuPlayer and MediaMetadataRetriever.

Change-Id: I8d0f5bbdde2ca24267cf4d62ab26afe9630e0217

1 files changed, 95 insertions, 0 deletions

diff --git a/media/libstagefright/include/MidiExtractor.h b/media/libstagefright/include/MidiExtractor.h
new file mode 100644
index 0000000..9a2abc0
--- /dev/null
+++ b/media/libstagefright/include/MidiExtractor.h
@@ -0,0 +1,95 @@
+/*
+ * 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.
+ */
+
+#ifndef MIDI_EXTRACTOR_H_
+#define MIDI_EXTRACTOR_H_
+
+#include <media/stagefright/DataSource.h>
+#include <media/stagefright/MediaExtractor.h>
+#include <media/stagefright/MediaBuffer.h>
+#include <media/stagefright/MediaBufferGroup.h>
+#include <media/MidiIoWrapper.h>
+#include <utils/String8.h>
+#include <libsonivox/eas.h>
+
+namespace android {
+
+class MidiEngine : public RefBase {
+public:
+    MidiEngine(const sp<DataSource> &dataSource,
+            const sp<MetaData> &fileMetadata,
+            const sp<MetaData> &trackMetadata);
+    ~MidiEngine();
+
+    status_t initCheck();
+
+    status_t allocateBuffers();
+    status_t releaseBuffers();
+    status_t seekTo(int64_t positionUs);
+    MediaBuffer* readBuffer();
+private:
+    sp<MidiIoWrapper> mIoWrapper;
+    MediaBufferGroup *mGroup;
+    EAS_DATA_HANDLE mEasData;
+    EAS_HANDLE mEasHandle;
+    const S_EAS_LIB_CONFIG* mEasConfig;
+    bool mIsInitialized;
+};
+
+class MidiExtractor : public MediaExtractor {
+
+public:
+    // Extractor assumes ownership of source
+    MidiExtractor(const sp<DataSource> &source);
+
+    virtual size_t countTracks();
+    virtual sp<MediaSource> getTrack(size_t index);
+    virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
+
+    virtual sp<MetaData> getMetaData();
+
+protected:
+    virtual ~MidiExtractor();
+
+private:
+    sp<DataSource> mDataSource;
+    status_t mInitCheck;
+    sp<MetaData> mFileMetadata;
+
+    // There is only one track
+    sp<MetaData> mTrackMetadata;
+
+    sp<MidiEngine> mEngine;
+
+    EAS_DATA_HANDLE     mEasData;
+    EAS_HANDLE          mEasHandle;
+    EAS_PCM*            mAudioBuffer;
+    EAS_I32             mPlayTime;
+    EAS_I32             mDuration;
+    EAS_STATE           mState;
+    EAS_FILE            mFileLocator;
+
+    MidiExtractor(const MidiExtractor &);
+    MidiExtractor &operator=(const MidiExtractor &);
+
+};
+
+bool SniffMidi(const sp<DataSource> &source, String8 *mimeType,
+        float *confidence, sp<AMessage> *);
+
+}  // namespace android
+
+#endif  // MIDI_EXTRACTOR_H_