AVF: Introduce adoption of AVAssetResourceLoaderDelegate protocol

AVAssetResourceLoaderDelegate allows to load custom resources.

Implemented resourceLoader:shouldWaitForLoadingOfRequestedResource to read data
from QIODevice.

The device should be seekable, and already should have all data available.
Since there is a need to know total size of the stream.

So the media player will wait for QIODevice::readyRead before loading the resource.

Also it requires to have url together with the stream:
QMediaPlayer->setMedia(QUrl("does_not_matter.mp3"), buffer);
Since the backend uses extension to determine type of the stream.

Fixes: QTBUG-69101
Change-Id: I8ab0b69f668ccd67c42a8e5d5c1ad518d3306cce
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/multimedia/playback/qmediaplayer.cpp b/src/multimedia/playback/qmediaplayer.cpp
index 2f1aa45c3..9d26e8d38 100644
--- a/src/multimedia/playback/qmediaplayer.cpp
+++ b/src/multimedia/playback/qmediaplayer.cpp
@@ -1005,8 +1005,9 @@ void QMediaPlayer::setPlaybackRate(qreal rate)
     Sets the current \a media source.
 
     If a \a stream is supplied; media data will be read from it instead of resolving the media
-    source. In this case the media source may still be used to resolve additional information
+    source. In this case the url should be provided to resolve additional information
     about the media such as mime type. The \a stream must be open and readable.
+    For macOS the \a stream should be also seekable.
 
     Setting the media to a null QMediaContent will cause the player to discard all
     information relating to the current media source and to cease all I/O operations related