第43讲 Perfetto 自动化之Camera前后切换性能自动化分析|极客笔记

本讲是Android Camera性能分析专题的第43讲，我们介Perfetto 自动化之Camera前后切换性能自动化分析。

更多资源：

资源	描述
在线课程	极客笔记在线课程
知识星球	星球名称：深入浅出Android Camera 星球ID: 17296815
Wechat	极客笔记圈

Camera前后摄切换性能拆解

模块	开始点	结束点
App	点击Camera Switch Icon	开始调用disconnect
HAL	开始调用disconnect	调用disconnect结束
App	调用disconnect结束	开始调用connectDevice
HAL	开始调用connectDevice	调用connectDevice结束
App	调用connectDevice结束	开始调用endConfigure
HAL	开始调用endConfigure	调用endConfigure结束
App	调用endConfigure结束	调用submitRequestList
HAL	调用submitRequestList	CameraServer收到第一帧

Camera前后摄切换性能自动化分析代码

代码见视频讲解

#!/usr/bin/env python3
from perfetto.trace_processor import TraceProcessor
from perfetto.trace_processor import TraceProcessorConfig

tp = TraceProcessor(trace=r'switch_camera.perfetto-trace', config=TraceProcessorConfig(
    bin_path=r'trace_processor_shell_v3.7.exe',
    verbose=False))

### Click switch camera icon
click_app_icon = tp.query('SELECT (slice.ts+slice.dur)/1e6 '
                          'FROM slice '
                          'WHERE ts <(SELECT ts FROM slice WHERE name == "connectDevice" LIMIT 1) '
                          'AND name like "%deliverInputEvent%" '
                          'ORDER BY ts DESC '
                          'LIMIT 1')
click_app_icon_ms = click_app_icon.as_pandas_dataframe().values[0][0]

### closCamera
closecamera_sql = """SELECT ts/1e6, dur/1e6 FROM
                slice
                JOIN thread_track ON slice.track_id = thread_track.id
                JOIN thread USING(utid)
                JOIN process USING(upid)
                WHERE slice.name='disconnectImpl' AND process.name='/system/bin/cameraserver'
                LIMIT 1"""
close_camera_df = tp.query(closecamera_sql).as_pandas_dataframe()
close_camera_begin = close_camera_df.values[0][0]
close_camera_dur = close_camera_df.values[0][1]

### openCamera
open_session = tp.query('SELECT (slice.ts/1e6), (slice.dur/1e6) '
                        'FROM slice '
                        'WHERE slice.name like "%CameraHal::openSession%"')
open_session_df = open_session.as_pandas_dataframe()
open_session_begin_ms = open_session_df.values[0][0]
open_session_duration_ms = open_session_df.values[0][1]

### beginConfigure
begin_configure = tp.query('SELECT (slice.ts/1e6) '
                          'FROM slice '
                          'WHERE slice.name like "%beginConfigure%" '
                          'LIMIT 1')
begin_configure_df = begin_configure.as_pandas_dataframe()
begin_configure_ms = begin_configure_df.values[0][0]

### endConfigure
end_configure = tp.query('SELECT (slice.ts/1e6), (slice.dur/1e6) '
                          'FROM slice '
                          'WHERE slice.name like "%endConfigure%" '
                          'LIMIT 1')
end_configure_df = end_configure.as_pandas_dataframe()
end_configure_begin_ms = end_configure_df.values[0][0]
end_configure_duration_ms = end_configure_df.values[0][1]

### submitRequestList
submit_request_list = tp.query('SELECT (slice.ts/1e6) '
                          'FROM slice '
                          'WHERE ts >(SELECT ts FROM slice WHERE name == "endConfigure" LIMIT 1) '
                          'AND slice.name like "%submitRequestList%" '
                          'ORDER BY slice.ts ASC '
                          'LIMIT 1')
submit_request_list_df = submit_request_list.as_pandas_dataframe()
submit_request_list_begin_ms = submit_request_list_df.values[0][0]

### CameraServer queue first frame
first_full_buffer = tp.query('SELECT (slice.ts/1e6), (slice.dur/1e6) '
                        'FROM slice '
                        'WHERE slice.name like "%first full buffer%"')
first_full_buffer_df = first_full_buffer.as_pandas_dataframe()
first_full_buffer_queued_ms = first_full_buffer_df.values[0][0] + first_full_buffer_df.values[0][1]

### print results
print("Total Switch Camera time:" + str(round((first_full_buffer_queued_ms - click_app_icon_ms), 2)) + " ms, break down as following:")
print("    [App] Click                     -->                  closCamera: " +
      str(round((close_camera_begin - click_app_icon_ms), 2)) + " ms")
print("    [HAL]                           -->                  closCamera: " +
      str(round((close_camera_dur), 2)) + " ms")
print("    [App] closCamera                -->      CameraHal::openSession: " +
      str(round((open_session_begin_ms - close_camera_begin - close_camera_dur), 2)) + " ms")
print("    [HAL]                                    CameraHal::openSession: " +
      str(round((open_session_duration_ms), 2)) + " ms")
print("    [App] CameraHal::openSession    -->              beginConfigure: " +
      str(round((begin_configure_ms - open_session_duration_ms - open_session_begin_ms), 2)) + " ms")
print("    [HAL] beginConfigure            -->                endConfigure: " +
      str(round((end_configure_begin_ms + end_configure_duration_ms - begin_configure_ms), 2)) + " ms")
print("    [App] endConfigure              -->           submitRequestList: " +
      str(round((submit_request_list_begin_ms - end_configure_begin_ms - end_configure_duration_ms), 2)) + " ms")
print("    [HAL] submitRequestList         --> Stream x: first full buffer: " +
      str(round((first_full_buffer_queued_ms - submit_request_list_begin_ms), 2)) + " ms")

输出

Camera前后摄切换性能自动化分析代码