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      1 /*
      2  * Copyright (C) 2012 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 #define LOG_TAG "FastMixerState"
     18 //#define LOG_NDEBUG 0
     19 
     20 #include <cutils/properties.h>
     21 #include "FastMixerState.h"
     22 
     23 namespace android {
     24 
     25 FastTrack::FastTrack() :
     26     mBufferProvider(NULL), mVolumeProvider(NULL),
     27     mChannelMask(AUDIO_CHANNEL_OUT_STEREO), mFormat(AUDIO_FORMAT_INVALID), mGeneration(0)
     28 {
     29 }
     30 
     31 FastTrack::~FastTrack()
     32 {
     33 }
     34 
     35 FastMixerState::FastMixerState() : FastThreadState(),
     36     // mFastTracks
     37     mFastTracksGen(0), mTrackMask(0), mOutputSink(NULL), mOutputSinkGen(0),
     38     mFrameCount(0), mTeeSink(NULL)
     39 {
     40     int ok = pthread_once(&sMaxFastTracksOnce, sMaxFastTracksInit);
     41     if (ok != 0) {
     42         ALOGE("%s pthread_once failed: %d", __func__, ok);
     43     }
     44 }
     45 
     46 FastMixerState::~FastMixerState()
     47 {
     48 }
     49 
     50 // static
     51 unsigned FastMixerState::sMaxFastTracks = kDefaultFastTracks;
     52 
     53 // static
     54 pthread_once_t FastMixerState::sMaxFastTracksOnce = PTHREAD_ONCE_INIT;
     55 
     56 // static
     57 const char *FastMixerState::commandToString(Command command)
     58 {
     59     const char *str = FastThreadState::commandToString(command);
     60     if (str != NULL) {
     61         return str;
     62     }
     63     switch (command) {
     64     case FastMixerState::MIX:       return "MIX";
     65     case FastMixerState::WRITE:     return "WRITE";
     66     case FastMixerState::MIX_WRITE: return "MIX_WRITE";
     67     }
     68     LOG_ALWAYS_FATAL("%s", __func__);
     69 }
     70 
     71 // static
     72 void FastMixerState::sMaxFastTracksInit()
     73 {
     74     char value[PROPERTY_VALUE_MAX];
     75     if (property_get("ro.audio.max_fast_tracks", value, NULL) > 0) {
     76         char *endptr;
     77         unsigned long ul = strtoul(value, &endptr, 0);
     78         if (*endptr == '\0' && kMinFastTracks <= ul && ul <= kMaxFastTracks) {
     79             sMaxFastTracks = (unsigned) ul;
     80         }
     81     }
     82     ALOGI("sMaxFastTracks = %u", sMaxFastTracks);
     83 }
     84 
     85 }   // namespace android
     86