android-accessory-display's Introduction

android-accessory-display

Host Required

python 2.7 & ubuntu 14.04LTS

1. install libusb

2. install ffmpeg

sudo add-apt-repository ppa:mc3man/trusty-media
sudo apt-get update
sudo apt-get install ffmpeg

3. install pyusb

or download source :  https://github.com/walac/pyusb

4. permission

/etc/udev/rules.d/51-android.rules
SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", ATTR{idProduct}=="2d01", MODE="0666", OWNER="<username>"
SUBSYSTEM=="usb", ATTR{idVendor}=="2717", ATTR{idProduct}=="ff68", MODE="0666", OWNER="<username>"
SUBSYSTEM=="usb", ATTR{idVendor}=="2717", ATTR{idProduct}=="ff48", MODE="0666", OWNER="<username>"
or used sudo when permission exception

5. run

enable USB debug on phone
a. aosp/frameworks/base/tests/AccessoryDisplay on phone
    when use this , screen size must less 320x240,
    or modify com.android.accessorydisplay.common.Protocol.MAX_ENVELOPE_SIZE more larger
b. run this file
c. run ffplay /tmp/android_accessory_display.pipe on ubuntu.
   prebuilt ffplay support video sync , it show slow then phone.
   getcode : https://github.com/FFmpeg/FFmpeg
   fixed it(not use video sync) : get ffmpeg source 
	 modify ffplay.c like follow :
		time= av_gettime_relative()/1000000.0;
        if (time < is->frame_timer + delay) {
            *remaining_time = FFMIN(is->frame_timer + delay - time, *remaining_time);
            //goto display; // == mask this line
        
        }
        is->frame_timer += delay;

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