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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_HARDWARE_STREAM_POWER_LOG_H
#define ANDROID_HARDWARE_STREAM_POWER_LOG_H
#include <audio_utils/clock.h>
#include <audio_utils/PowerLog.h>
#include <cutils/bitops.h>
#include <cutils/properties.h>
#include <system/audio.h>
namespace android {
class StreamPowerLog {
public:
StreamPowerLog() :
mIsUserDebugOrEngBuild(is_userdebug_or_eng_build()),
mPowerLog(nullptr),
mFrameSize(0) {
// use init() to set up the power log.
}
~StreamPowerLog() {
power_log_destroy(mPowerLog); // OK for null mPowerLog
mPowerLog = nullptr;
}
// A one-time initialization (do not call twice) before using StreamPowerLog.
void init(uint32_t sampleRate, audio_channel_mask_t channelMask, audio_format_t format) {
if (mPowerLog == nullptr) {
// Note: A way to get channel count for both input and output channel masks
// but does not check validity of the channel mask.
const uint32_t channelCount = popcount(audio_channel_mask_get_bits(channelMask));
mFrameSize = channelCount * audio_bytes_per_sample(format);
if (mFrameSize > 0) {
const size_t kPowerLogFramesPerEntry =
(long long)sampleRate * kPowerLogSamplingIntervalMs / 1000;
mPowerLog = power_log_create(
sampleRate,
channelCount,
format,
kPowerLogEntries,
kPowerLogFramesPerEntry);
}
}
// mPowerLog may be NULL (not the right build, format not accepted, etc.).
}
// Dump the power log to fd.
void dump(int fd) const {
// OK for null mPowerLog
(void)power_log_dump(
mPowerLog, fd, " " /* prefix */, kPowerLogLines, 0 /* limit_ns */);
}
// Log the audio data contained in buffer.
void log(const void *buffer, size_t sizeInBytes) const {
if (mPowerLog != nullptr) { // mFrameSize is always nonzero if mPowerLog exists.
power_log_log(
mPowerLog, buffer, sizeInBytes / mFrameSize, audio_utils_get_real_time_ns());
}
}
bool isUserDebugOrEngBuild() const {
return mIsUserDebugOrEngBuild;
}
private:
static inline bool is_userdebug_or_eng_build() {
char value[PROPERTY_VALUE_MAX];
(void)property_get("ro.build.type", value, "unknown"); // ignore actual length
return strcmp(value, "userdebug") == 0 || strcmp(value, "eng") == 0;
}
// Audio signal power log configuration.
static const size_t kPowerLogLines = 40;
static const size_t kPowerLogSamplingIntervalMs = 50;
static const size_t kPowerLogEntries = (1 /* minutes */ * 60 /* seconds */ * 1000 /* msec */
/ kPowerLogSamplingIntervalMs);
const bool mIsUserDebugOrEngBuild;
power_log_t *mPowerLog;
size_t mFrameSize;
};
} // namespace android
#endif // ANDROID_HARDWARE_STREAM_POWER_LOG_H