device: enable fast channel switch - #282
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Up to now, playback (both, audio and video) started at the moment, when they are in sync and all buffers are filled enough. This commit introduces two options: 1) video: Immediately present the very first video frame as a stillpicture as soon as the decoder releases it. Start audio and video playback together, as soon as audio and video are in sync. This version drops all audio data which is older than the video PTS, which is waiting for audio to come up. 2) video + audio: Same as 1), but also start audio playback as soon as the audio buffer is filled enough. Video starts at the time, when then audio PTS reaches the "parked" video PTS. This version is a bit slower with the sync than "video", because we play all audio data and don't drop it.
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If enabled, the first frame which was released from the decoder is displayed without respect to any AV-Sync. This is frame is displayed as a stillpicture until AV-Sync is possible.
This feature is configurable in the setup menu.
A next step could be to start the audio playback as soon as audio arrives.