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