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Rewrite FFmpeg decoder to use pull model

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This allows us to keep asynchronous decoders like MMAL and V4L2M2M fed
while we're waiting for output frames. Behavior for synchronous decoders
should be identical.

Continuing to feed new data while waiting for output frames is crucial for
acceptable performance on 1080p video on the Raspberry Pi using V4L2M2M,
since it allows the decode and copy operations to be pipelined.
This commit is contained in:
Cameron Gutman
2022-01-17 15:06:12 -06:00
parent 8a27fa7bb5
commit d6cfbdb273
4 changed files with 165 additions and 119 deletions
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8
app/streaming/session.cpp
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@@ -357,6 +357,13 @@ bool Session::populateDecoderProperties(SDL_Window* window)
}
m_VideoCallbacks.capabilities = decoder->getDecoderCapabilities();
if (m_VideoCallbacks.capabilities & CAPABILITY_PULL_RENDERER) {
// It is an error to pass a push callback when in pull mode
m_VideoCallbacks.submitDecodeUnit = nullptr;
}
else {
m_VideoCallbacks.submitDecodeUnit = drSubmitDecodeUnit;
}
m_StreamConfig.colorSpace = decoder->getDecoderColorspace();
@@ -439,7 +446,6 @@ bool Session::initialize()
LiInitializeVideoCallbacks(&m_VideoCallbacks);
m_VideoCallbacks.setup = drSetup;
m_VideoCallbacks.submitDecodeUnit = drSubmitDecodeUnit;
LiInitializeStreamConfiguration(&m_StreamConfig);
m_StreamConfig.width = m_Preferences->width;