Add basic metadata retrieval support for midi, ogg, etc.

Bug 2050320

1 files changed, 91 insertions, 0 deletions

diff --git a/media/libmediaplayerservice/MidiMetadataRetriever.cpp b/media/libmediaplayerservice/MidiMetadataRetriever.cpp
new file mode 100644
index 0000000..3795b7b
--- /dev/null
+++ b/media/libmediaplayerservice/MidiMetadataRetriever.cpp
@@ -0,0 +1,91 @@
+/*
+**
+** Copyright 2009, 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 "MidiMetadataRetriever"
+#include <utils/Log.h>
+
+#include "MidiMetadataRetriever.h"
+#include <media/mediametadataretriever.h>
+
+namespace android {
+
+static status_t ERROR_NOT_OPEN = -1;
+static status_t ERROR_OPEN_FAILED = -2;
+static status_t ERROR_EAS_FAILURE = -3;
+static status_t ERROR_ALLOCATE_FAILED = -4;
+
+void MidiMetadataRetriever::clearMetadataValues()
+{
+    LOGV("clearMetadataValues");
+    mMetadataValues[0][0] = '\0';
+}
+
+status_t MidiMetadataRetriever::setDataSource(const char *url)
+{
+    LOGV("setDataSource: %s", url? url: "NULL pointer");
+    Mutex::Autolock lock(mLock);
+    clearMetadataValues();
+    if (mMidiPlayer == 0) {
+        mMidiPlayer = new MidiFile();
+    }
+    return mMidiPlayer->setDataSource(url);
+}
+
+status_t MidiMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length)
+{
+    LOGV("setDataSource: fd(%d), offset(%lld), and length(%lld)", fd, offset, length);
+    Mutex::Autolock lock(mLock);
+    clearMetadataValues();
+    if (mMidiPlayer == 0) {
+        mMidiPlayer = new MidiFile();
+    }
+    return mMidiPlayer->setDataSource(fd, offset, length);;
+}
+
+const char* MidiMetadataRetriever::extractMetadata(int keyCode)
+{
+    LOGV("extractMetdata: key(%d)", keyCode);
+    Mutex::Autolock lock(mLock);
+    if (mMidiPlayer == 0 || mMidiPlayer->initCheck() != NO_ERROR) {
+        LOGE("Midi player is not initialized yet");
+        return NULL;
+    }
+    switch (keyCode) {
+    case METADATA_KEY_DURATION:
+        {
+            if (mMetadataValues[0][0] == '\0') {
+                int duration = -1;
+                if (mMidiPlayer->getDuration(&duration) != NO_ERROR) {
+                    LOGE("failed to get duration");
+                    return NULL;
+                }
+                snprintf(mMetadataValues[0], MAX_METADATA_STRING_LENGTH, "%d", duration);
+            }
+
+            LOGV("duration: %s ms", mMetadataValues[0]);
+            return mMetadataValues[0];
+        }
+    default:
+        LOGE("Unsupported key code (%d)", keyCode);
+        return NULL;
+    }
+    return NULL;
+}
+
+};
+