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      1 /*
      2  * Copyright 2015, The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef _ANDROID_MEDIA_PLAYBACK_PARAMS_H_
     18 #define _ANDROID_MEDIA_PLAYBACK_PARAMS_H_
     19 
     20 #include <media/AudioResamplerPublic.h>
     21 
     22 namespace android {
     23 
     24 // This entire class is inline as it is used from both core and media
     25 struct PlaybackParams {
     26     AudioPlaybackRate audioRate;
     27     bool speedSet;
     28     bool pitchSet;
     29     bool audioFallbackModeSet;
     30     bool audioStretchModeSet;
     31 
     32     struct fields_t {
     33         jclass      clazz;
     34         jmethodID   constructID;
     35 
     36         jfieldID    speed;
     37         jfieldID    pitch;
     38         jfieldID    audio_fallback_mode;
     39         jfieldID    audio_stretch_mode;
     40         jfieldID    set;
     41         jint        set_speed;
     42         jint        set_pitch;
     43         jint        set_audio_fallback_mode;
     44         jint        set_audio_stretch_mode;
     45 
     46         void init(JNIEnv *env) {
     47             jclass lclazz = env->FindClass("android/media/PlaybackParams");
     48             if (lclazz == NULL) {
     49                 return;
     50             }
     51 
     52             clazz = (jclass)env->NewGlobalRef(lclazz);
     53             if (clazz == NULL) {
     54                 return;
     55             }
     56 
     57             constructID = env->GetMethodID(clazz, "<init>", "()V");
     58 
     59             speed = env->GetFieldID(clazz, "mSpeed", "F");
     60             pitch = env->GetFieldID(clazz, "mPitch", "F");
     61             audio_fallback_mode = env->GetFieldID(clazz, "mAudioFallbackMode", "I");
     62             audio_stretch_mode = env->GetFieldID(clazz, "mAudioStretchMode", "I");
     63             set = env->GetFieldID(clazz, "mSet", "I");
     64 
     65             set_speed =
     66                 env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "SET_SPEED", "I"));
     67             set_pitch =
     68                 env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "SET_PITCH", "I"));
     69             set_audio_fallback_mode = env->GetStaticIntField(
     70                     clazz, env->GetStaticFieldID(clazz, "SET_AUDIO_FALLBACK_MODE", "I"));
     71             set_audio_stretch_mode = env->GetStaticIntField(
     72                     clazz, env->GetStaticFieldID(clazz, "SET_AUDIO_STRETCH_MODE", "I"));
     73 
     74             env->DeleteLocalRef(lclazz);
     75         }
     76 
     77         void exit(JNIEnv *env) {
     78             env->DeleteGlobalRef(clazz);
     79             clazz = NULL;
     80         }
     81     };
     82 
     83     void fillFromJobject(JNIEnv *env, const fields_t& fields, jobject params) {
     84         audioRate.mSpeed = env->GetFloatField(params, fields.speed);
     85         audioRate.mPitch = env->GetFloatField(params, fields.pitch);
     86         audioRate.mFallbackMode =
     87             (AudioTimestretchFallbackMode)env->GetIntField(params, fields.audio_fallback_mode);
     88         audioRate.mStretchMode =
     89             (AudioTimestretchStretchMode)env->GetIntField(params, fields.audio_stretch_mode);
     90         int set = env->GetIntField(params, fields.set);
     91 
     92         speedSet = set & fields.set_speed;
     93         pitchSet = set & fields.set_pitch;
     94         audioFallbackModeSet = set & fields.set_audio_fallback_mode;
     95         audioStretchModeSet = set & fields.set_audio_stretch_mode;
     96     }
     97 
     98     jobject asJobject(JNIEnv *env, const fields_t& fields) {
     99         jobject params = env->NewObject(fields.clazz, fields.constructID);
    100         if (params == NULL) {
    101             return NULL;
    102         }
    103         env->SetFloatField(params, fields.speed, (jfloat)audioRate.mSpeed);
    104         env->SetFloatField(params, fields.pitch, (jfloat)audioRate.mPitch);
    105         env->SetIntField(params, fields.audio_fallback_mode, (jint)audioRate.mFallbackMode);
    106         env->SetIntField(params, fields.audio_stretch_mode, (jint)audioRate.mStretchMode);
    107         env->SetIntField(
    108                 params, fields.set,
    109                 (speedSet ? fields.set_speed : 0)
    110                         | (pitchSet ? fields.set_pitch : 0)
    111                         | (audioFallbackModeSet ? fields.set_audio_fallback_mode : 0)
    112                         | (audioStretchModeSet  ? fields.set_audio_stretch_mode : 0));
    113 
    114         return params;
    115     }
    116 };
    117 
    118 }  // namespace android
    119 
    120 #endif  // _ANDROID_MEDIA_PLAYBACK_PARAMS_H_
    121