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      1 /*
      2 **
      3 ** Copyright 2009, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 //#define LOG_NDEBUG 0
     19 #define LOG_TAG "MidiMetadataRetriever"
     20 #include <utils/Log.h>
     21 
     22 #include "MidiMetadataRetriever.h"
     23 #include <media/mediametadataretriever.h>
     24 
     25 namespace android {
     26 
     27 static status_t ERROR_NOT_OPEN = -1;
     28 static status_t ERROR_OPEN_FAILED = -2;
     29 static status_t ERROR_EAS_FAILURE = -3;
     30 static status_t ERROR_ALLOCATE_FAILED = -4;
     31 
     32 void MidiMetadataRetriever::clearMetadataValues()
     33 {
     34     ALOGV("clearMetadataValues");
     35     mMetadataValues[0][0] = '\0';
     36 }
     37 
     38 status_t MidiMetadataRetriever::setDataSource(
     39         const char *url, const KeyedVector<String8, String8> *headers)
     40 {
     41     ALOGV("setDataSource: %s", url? url: "NULL pointer");
     42     Mutex::Autolock lock(mLock);
     43     clearMetadataValues();
     44     if (mMidiPlayer == 0) {
     45         mMidiPlayer = new MidiFile();
     46     }
     47     return mMidiPlayer->setDataSource(url, headers);
     48 }
     49 
     50 status_t MidiMetadataRetriever::setDataSource(int fd, int64_t offset, int64_t length)
     51 {
     52     ALOGV("setDataSource: fd(%d), offset(%lld), and length(%lld)", fd, offset, length);
     53     Mutex::Autolock lock(mLock);
     54     clearMetadataValues();
     55     if (mMidiPlayer == 0) {
     56         mMidiPlayer = new MidiFile();
     57     }
     58     return mMidiPlayer->setDataSource(fd, offset, length);;
     59 }
     60 
     61 const char* MidiMetadataRetriever::extractMetadata(int keyCode)
     62 {
     63     ALOGV("extractMetdata: key(%d)", keyCode);
     64     Mutex::Autolock lock(mLock);
     65     if (mMidiPlayer == 0 || mMidiPlayer->initCheck() != NO_ERROR) {
     66         ALOGE("Midi player is not initialized yet");
     67         return NULL;
     68     }
     69     switch (keyCode) {
     70     case METADATA_KEY_DURATION:
     71         {
     72             if (mMetadataValues[0][0] == '\0') {
     73                 int duration = -1;
     74                 if (mMidiPlayer->getDuration(&duration) != NO_ERROR) {
     75                     ALOGE("failed to get duration");
     76                     return NULL;
     77                 }
     78                 snprintf(mMetadataValues[0], MAX_METADATA_STRING_LENGTH, "%d", duration);
     79             }
     80 
     81             ALOGV("duration: %s ms", mMetadataValues[0]);
     82             return mMetadataValues[0];
     83         }
     84     default:
     85         ALOGE("Unsupported key code (%d)", keyCode);
     86         return NULL;
     87     }
     88     return NULL;
     89 }
     90 
     91 };
     92 
     93