1633647 - Navigating to audio/wav file prompts to open native application or save, plays file at HTMLMediaElement

Status: RESOLVED DUPLICATE of bug 1247826

(Core :: Audio/Video: Playback, defect, P3)

Description

[guest271314]

Attachment: nightly_prompts_to_save_wav_files.html

User Agent: Mozilla/5.0 (X11; Linux i686; rv:77.0) Gecko/20100101 Firefox/77.0

Steps to reproduce:

Navigate to at address bar or load a URL pointing to an audio/wav file at <iframe> element.

Actual results:

A UI dialog prompts to Open with native application (media player) or Save File.

Expected results:

The resource should be loaded at <iframe> and from navigation/address bar the same as OGG (video/ogg; audio/ogg), WebM (video/webm), MP4 (video/mp4) which along with WAV (audio/wav) all return

"maybe"

from HTMLMediaElement.canPlayType(MIME) without being prompted to open the file with a native media player: Firefox and Nightly media player implementation at HTML <audio> and <video> elements does play WAV files.

Comment 1

[BugBot [:suhaib / :marco]]

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Alastor Wu [:alwu]]

Hi, Edgar,

When loading a media URI directly, we would check if this type of media is supported [1], then create a media document for that if we can play this media. Do you know where we do the similar check for an iframe?

Thank you.

[1] https://searchfox.org/mozilla-central/rev/54f965e51e4f77866bec42737978d40d4c1fdfc5/layout/build/nsContentDLF.cpp#164-176

Comment 3

[Edgar Chen [:edgar]]

iframe should also go the same code path to check content type.
Even I load the URI (https://ia800301.us.archive.org/10/items/DELTAnine2013-12-11.WAV/Deltanine121113Pt3Wav.wav) directly, the dialog still prompts.

Comment 4

[Edgar Chen [:edgar]]

If my understanding is correct, the decision is made in nsExternalHelperAppService, https://searchfox.org/mozilla-central/rev/7908ce29657cfd623993046bd8e38664e1c0b28e/uriloader/exthandler/nsExternalHelperAppService.cpp#1506.

Comment 5

[Edgar Chen [:edgar]]

There is a similar bug, https://bugzilla.mozilla.org/show_bug.cgi?id=1247826. But it seems not the same case, because I didn't see DecoderTraits::ShouldHandleMediaType got called, at least on Mac. And https://searchfox.org/mozilla-central/rev/7908ce29657cfd623993046bd8e38664e1c0b28e/uriloader/exthandler/nsExternalHelperAppService.cpp#1506 has some os-depended code, so the behavior might different between OS?

Comment 6

[Alastor Wu [:alwu]]

Thank you for help, I will duplicate this one and discuss should we support play wav file directly in bug1247826.