1 /* 2 * Copyright (C) 2017 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_HARDWARE_STREAM_POWER_LOG_H 18 #define ANDROID_HARDWARE_STREAM_POWER_LOG_H 19 20 #include <audio_utils/clock.h> 21 #include <audio_utils/PowerLog.h> 22 #include <cutils/bitops.h> 23 #include <cutils/properties.h> 24 #include <system/audio.h> 25 26 namespace android { 27 namespace CPP_VERSION { 28 29 class StreamPowerLog { 30 public: StreamPowerLog()31 StreamPowerLog() : 32 mIsUserDebugOrEngBuild(is_userdebug_or_eng_build()), 33 mPowerLog(nullptr), 34 mFrameSize(0) { 35 // use init() to set up the power log. 36 } 37 ~StreamPowerLog()38 ~StreamPowerLog() { 39 power_log_destroy(mPowerLog); // OK for null mPowerLog 40 mPowerLog = nullptr; 41 } 42 43 // A one-time initialization (do not call twice) before using StreamPowerLog. init(uint32_t sampleRate,audio_channel_mask_t channelMask,audio_format_t format)44 void init(uint32_t sampleRate, audio_channel_mask_t channelMask, audio_format_t format) { 45 if (mPowerLog == nullptr) { 46 // Note: A way to get channel count for both input and output channel masks 47 // but does not check validity of the channel mask. 48 const uint32_t channelCount = popcount(audio_channel_mask_get_bits(channelMask)); 49 mFrameSize = channelCount * audio_bytes_per_sample(format); 50 if (mFrameSize > 0) { 51 const size_t kPowerLogFramesPerEntry = 52 (long long)sampleRate * kPowerLogSamplingIntervalMs / 1000; 53 mPowerLog = power_log_create( 54 sampleRate, 55 channelCount, 56 format, 57 kPowerLogEntries, 58 kPowerLogFramesPerEntry); 59 } 60 } 61 // mPowerLog may be NULL (not the right build, format not accepted, etc.). 62 } 63 64 // Dump the power log to fd. dump(int fd)65 void dump(int fd) const { 66 // OK for null mPowerLog 67 (void)power_log_dump( 68 mPowerLog, fd, " " /* prefix */, kPowerLogLines, 0 /* limit_ns */); 69 } 70 71 // Log the audio data contained in buffer. log(const void * buffer,size_t sizeInBytes)72 void log(const void *buffer, size_t sizeInBytes) const { 73 if (mPowerLog != nullptr) { // mFrameSize is always nonzero if mPowerLog exists. 74 power_log_log( 75 mPowerLog, buffer, sizeInBytes / mFrameSize, audio_utils_get_real_time_ns()); 76 } 77 } 78 isUserDebugOrEngBuild()79 bool isUserDebugOrEngBuild() const { 80 return mIsUserDebugOrEngBuild; 81 } 82 83 private: 84 is_userdebug_or_eng_build()85 static inline bool is_userdebug_or_eng_build() { 86 char value[PROPERTY_VALUE_MAX]; 87 (void)property_get("ro.build.type", value, "unknown"); // ignore actual length 88 return strcmp(value, "userdebug") == 0 || strcmp(value, "eng") == 0; 89 } 90 91 // Audio signal power log configuration. 92 static const size_t kPowerLogLines = 40; 93 static const size_t kPowerLogSamplingIntervalMs = 50; 94 static const size_t kPowerLogEntries = (1 /* minutes */ * 60 /* seconds */ * 1000 /* msec */ 95 / kPowerLogSamplingIntervalMs); 96 97 const bool mIsUserDebugOrEngBuild; 98 power_log_t *mPowerLog; 99 size_t mFrameSize; 100 }; 101 102 } // namespace CPP_VERSION 103 } // namespace android 104 105 #endif // ANDROID_HARDWARE_STREAM_POWER_LOG_H 106