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Add support for a forced software encoder fallback.

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Make it possible to switch from VP8 HW -> VP8 SW -> VP8 HW depending on bitrate and resolution.

BUG=webrtc:6634

Review-Url: https://codereview.webrtc.org/2988963002
Cr-Commit-Position: refs/heads/master@{#19362}
This commit is contained in:
asapersson
2017-08-16 00:53:59 -07:00
committed by Commit Bot
parent 2b05ba1874
commit 22c76c4e65
4 changed files with 509 additions and 19 deletions
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30
webrtc/media/engine/videoencodersoftwarefallbackwrapper.h
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@ -49,6 +49,33 @@ class VideoEncoderSoftwareFallbackWrapper : public VideoEncoder {
private:
bool InitFallbackEncoder();
// If |forced_fallback_possible_| is true:
// The forced fallback is requested if the target bitrate is below |low_kbps|
// for more than |min_low_ms| and the input video resolution is not larger
// than |kMaxPixels|.
// If the bitrate is above |high_kbps|, the forced fallback is requested to
// immediately be stopped.
class ForcedFallbackParams {
public:
bool ShouldStart(uint32_t bitrate_kbps, const VideoCodec& codec);
bool ShouldStop(uint32_t bitrate_kbps) const;
void Reset() { start_ms.reset(); }
bool IsValid(const VideoCodec& codec) const {
return codec.width * codec.height <= kMaxPixels;
}
rtc::Optional<int64_t> start_ms; // Set when bitrate is below |low_kbps|.
uint32_t low_kbps = 100;
uint32_t high_kbps = 150;
int64_t min_low_ms = 10000;
const int kMaxPixels = 320 * 240;
};
bool RequestForcedFallback();
bool TryReleaseForcedFallbackEncoder();
bool TryReInitForcedFallbackEncoder();
void ValidateSettingsForForcedFallback();
bool IsForcedFallbackActive() const;
// Settings used in the last InitEncode call and used if a dynamic fallback to
// software is required.
VideoCodec codec_settings_;
@ -71,6 +98,9 @@ class VideoEncoderSoftwareFallbackWrapper : public VideoEncoder {
std::unique_ptr<webrtc::VideoEncoder> fallback_encoder_;
std::string fallback_implementation_name_;
EncodedImageCallback* callback_;
bool forced_fallback_possible_;
ForcedFallbackParams forced_fallback_;
};
} // namespace webrtc