Bug 1804058 FLAC extractor

Note: dependent on external/flac for libFLAC

Implemented and tested:
 * FLAC container
 * mono and stereo
 * standard sample rates
 * standard bit depths
 * sniffer
 * media scanner
 * Vorbis comment metadata including album art
 * random access seeking with "torture test"
 * web browser integration for audio/flac (not audio/x-flac), but
   note that most web servers don't correctly report the MIME type

Not implemented:
 * 24-bit to 16-bit dither or noise shaping in AudioFlinger
 * 96 kHz to 44.1 or 48 kHz downsampling low pass filter in AudioFlinger
 * replay gain is better done in AudioFlinger
 * multi-channel, would need AudioFlinger support
 * Ogg container, does not seem to be very popular yet

Change-Id: I300873e8c0cfc2e95403d9adb5064d16a2923f17

2 files changed, 67 insertions, 0 deletions

diff --git a/media/libstagefright/include/FLACExtractor.h b/media/libstagefright/include/FLACExtractor.h
new file mode 100644
index 0000000..ded91c2
--- /dev/null
+++ b/media/libstagefright/include/FLACExtractor.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2011 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 FLAC_EXTRACTOR_H_
+#define FLAC_EXTRACTOR_H_
+
+#include <media/stagefright/DataSource.h>
+#include <media/stagefright/MediaExtractor.h>
+#include <utils/String8.h>
+
+namespace android {
+
+class FLACParser;
+
+class FLACExtractor : public MediaExtractor {
+
+public:
+    // Extractor assumes ownership of source
+    FLACExtractor(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 ~FLACExtractor();
+
+private:
+    sp<DataSource> mDataSource;
+    sp<FLACParser> mParser;
+    status_t mInitCheck;
+    sp<MetaData> mFileMetadata;
+
+    // There is only one track
+    sp<MetaData> mTrackMetadata;
+
+    status_t init();
+
+    FLACExtractor(const FLACExtractor &);
+    FLACExtractor &operator=(const FLACExtractor &);
+
+};
+
+bool SniffFLAC(const sp<DataSource> &source, String8 *mimeType,
+        float *confidence, sp<AMessage> *);
+
+}  // namespace android
+
+#endif  // FLAC_EXTRACTOR_H_
diff --git a/media/libstagefright/include/OggExtractor.h b/media/libstagefright/include/OggExtractor.h
index 1eda025..a41f681 100644
--- a/media/libstagefright/include/OggExtractor.h
+++ b/media/libstagefright/include/OggExtractor.h
@@ -57,6 +57,9 @@ bool SniffOgg(
         const sp<DataSource> &source, String8 *mimeType, float *confidence,
         sp<AMessage> *);
 
+void parseVorbisComment(
+        const sp<MetaData> &fileMeta, const char *comment, size_t commentLength);
+
 }  // namespace android
 
 #endif  // OGG_EXTRACTOR_H_