video_decoder.cpp

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/*
 * Copyright 2019 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#include "experimental/ffmpeg/SkVideoDecoder.h"
#include "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkStream.h"
 
class VideoDecoderGM : public skiagm::GM {
    SkVideoDecoder fDecoder;
 
public:
    VideoDecoderGM() {}
 
protected:
    SkString getName() const override { return SkString("videodecoder"); }
 
    SkISize getISize() override { return SkISize::Make(1024, 768); }
 
    void onOnceBeforeDraw() override {
        if (!fDecoder.loadStream(SkStream::MakeFromFile("/skia/ice.mp4"))) {
            SkDebugf("could not load movie file\n");
        }
        SkDebugf("duration %g\n", fDecoder.duration());
    }
 
    void onDraw(SkCanvas* canvas) override {
        auto* rContext = canvas->recordingContext();
        if (!rContext) {
            return;
        }
 
        fDecoder.setGrContext(rContext);  // context can change over time in viewer
 
        double timeStamp;
        auto img = fDecoder.nextImage(&timeStamp);
        if (!img) {
            (void)fDecoder.rewind();
            img = fDecoder.nextImage(&timeStamp);
        }
        if (img) {
            if (0) {
                SkDebugf("ts %g\n", timeStamp);
            }
            canvas->drawImage(img, 10, 10);
        }
    }
 
    bool onAnimate(double nanos) override {
        return true;
    }
 
private:
    using INHERITED = GM;
};
DEF_GM( return new VideoDecoderGM; )