doc:appunti:android:logo_bootanimation
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| doc:appunti:android:logo_bootanimation [2019/10/07 11:08] – [Unpack and repack the log.bin] niccolo | doc:appunti:android:logo_bootanimation [2019/10/07 16:32] – [Contents of bootanimation.zip] niccolo | ||
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| Line 31: | Line 31: | ||
| ==== Unpack and repack the log.bin ==== | ==== Unpack and repack the log.bin ==== | ||
| - | Download | + | Unfortunately |
| < | < | ||
| Line 53: | Line 53: | ||
| </ | </ | ||
| - | so we can desume that the picture is 4 bytes/ | + | so we can desume that the picture is 4 bytes/ |
| < | < | ||
| Line 73: | Line 73: | ||
| ffmpeg -pix_fmts | ffmpeg -pix_fmts | ||
| </ | </ | ||
| - | ===== Web References | + | ===== bootanimation.zip |
| + | The logo contained into the **logo.bin** partition is displayed in the early stage of the boot process. Once the system partition is available, an animation is played for some seconds. That animation is contained into a zip file. In our case it turned out that the file is stored in **/ | ||
| + | |||
| + | There should be an executable responsible to actually run the animation, it should be **/ | ||
| + | |||
| + | * **/ | ||
| + | * **/ | ||
| + | * **/ | ||
| + | * **/ | ||
| + | |||
| + | If bootanimation.zip file is **not found**, the **framework-res.apk** package is searched into directories **/ | ||
| + | |||
| + | * assets/ | ||
| + | * assets/ | ||
| + | |||
| + | ==== Contents of bootanimation.zip ==== | ||
| + | |||
| + | Generally the animation is composed of **two parts**: the first is played just **once**, the second part is played in **loop** until the system is ready. This is controlled by the contents of the **desc.txt** file contained into the zip, here it is an example: | ||
| + | |||
| + | < | ||
| + | 720 1280 15 | ||
| + | p 1 0 part0 | ||
| + | p 0 0 part1 | ||
| + | </ | ||
| + | |||
| + | The first line tell us that the animation is **720x1280 pixels**, at **15 frames per second**. | ||
| + | |||
| + | The second line tell us that there is a part of **type p** to be executed **1** time. The following number (**0** in the example above) someone says that it is a pause to wait after the animation, in my case it is instead ununsed at all. The actual frames are contained into the **part0** subdirectory. | ||
| + | |||
| + | The last line defines another part **type p** to be executed in an endless (**0**) loop until the system is ready, with a zero **0** pause. The frames are into the **part1** subdirectory. | ||
| + | |||
| + | A **type p** means that the animation can be interrupted when the boot process is completed. If you want instead a part to be played as the final part of the animation (e.g. if you want a fade-out effect), you have to use a **tpye c**. | ||
| + | |||
| + | < | ||
| + | 720 1280 15 | ||
| + | p 1 0 part0 | ||
| + | c 0 0 part1 | ||
| + | c 0 0 part2 | ||
| + | </ | ||
| + | |||
| + | In the above example, once the boot process is completed, the **part1** is interrupted, | ||
| + | |||
| + | Frames are actually **PNG images**, of the proper size (720x1280 in our case). | ||
| + | |||
| + | So the directories structure should be something like this: | ||
| + | |||
| + | < | ||
| + | . | ||
| + | ├── desc.txt | ||
| + | ├── part0 | ||
| + | │ ├── img_000.png | ||
| + | │ ├── ... | ||
| + | │ └── img_196.png | ||
| + | └── part1 | ||
| + | ├── img_197.png | ||
| + | ├── ... | ||
| + | └── img_207.png | ||
| + | </ | ||
| + | |||
| + | To pack eveything into a zip file you can use the command: | ||
| + | |||
| + | < | ||
| + | zip -r -Z store bootanimation.zip desc.txt part0 part1 | ||
| + | </ | ||
| + | |||
| + | Beware of the **%%-Z store%%** option: the zip archive must be created using the **store compression method**, not the //deflate// one. | ||
| + | ===== Web References ===== | ||
| + | * **[[https:// | ||
| * **[[https:// | * **[[https:// | ||
| + | * **[[http:// | ||
doc/appunti/android/logo_bootanimation.txt · Last modified: 2019/10/07 16:33 by niccolo