File Preview

[jesmrec]

This issue intends to be an epic to discuss about the way to preview downloaded files

Issues to take in account:

• Security: for files like MS Office ones or web can execute macros or js pointing to malicious targets (phising attacks etc...)... using WKWebView as in Update UIWebView to WKWebView ios-legacy#1046

• Pics: the point here is using or not a preview in "streaming" mode (caching the image in less resolution instead of downloading it) to save both bandwidth and storage. For images / animated gifs, setting a Gallery mode should be a must.

• Edition mode: currently available for txt files, embedded in preview mode.

• Operations in preview mode: apart of preview the file, some shortcuts can be provided (thinking in the future), like deleting, sharing, downloading, set as available offline (always synced), send...

• Video: streaming for secured connections

• Audio: streaming for secured connections

[michaelstingl]

Txt file editing: No priority. Needs another discussion about encoding etc someday maybe. With Files app integration it's very easy to use a better 3rd party text editor.

[michaelstingl]

I've got questions about audio streaming. Are there file formats that support this? Can this work similar to video streaming?

[javiergonzper]

I've got questions about audio streaming. Are there file formats that support this? Can this work similar to video streaming?

@michaelstingl It is very similar for video and audio (mostly is the same). We should use AVFundation to play them.
After reading the AVMediaFormat.h all the supported files are:

com.apple.quicktime-movie: .mov and .qt
public.mpeg-4: .mp4
com.apple.m4v-video: .m4v
com.apple.m4a-audio: .m4a
public.3gpp: .3gp, .3gpp, and .sdv
public.3gpp2: .3g2, .3gp2
com.apple.coreaudio-format: .caf
com.microsoft.waveform-audio: .wav, .wave, and .bwf
public.aiff-audio: .aif and .aiff
public.aifc-audio: .aifc and .cdda
org.3gpp.adaptive-multi-rate-audio: .amr
public.mp3: .mp3
public.au-audio: .au and .snd
public.ac3-audio: .ac3
public.enhanced-ac3-audio: .eac3
public.jpeg: .jpg or .jpeg
com.adobe.raw-image: .dng
public.heic: .heic
public.avci: .avci
public.heif: .heif
public.tiff: .tiff or .tif

[javiergonzper]

As an initial work we should create a default "File Preview" to open it before the file was loaded (or downloaded).

Also I am working on the More (the 3 dots of the top right corner)

[michaelstingl]

I opened an individual issue for "Send a file to other applications": #130

Is this related to #112 too?