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ReadFrames updated to return RGBA image slice

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Krzysztofz01 2023-08-29 10:55:14 +02:00
parent a1d63d0f9f
commit f6a2909ea3
3 changed files with 10 additions and 15 deletions
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README.md
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@ -16,7 +16,7 @@ go get github.com/AlexEidt/Vidio
The `Video` struct stores data about a video file you give it. The code below shows an example of sequentially reading the frames of the given video.
Calling the `Read()` function will fill in the `Video` struct `framebuffer` with the next frame data as 8-bit RGBA data, stored in a flattened byte array in row-major order where each pixel is represented by four consecutive bytes representing the R, G, B and A components of that pixel. Note that the A (alpha) component will always be 255. When iteration over the entire video file is not required, we can lookup a specific frame by calling `ReadFrame(n int)`. By calling `ReadFrames(n ...int)`, we can immediately access multiple frames as `[][]byte` and skip the `framebuffer`.
Calling the `Read()` function will fill in the `Video` struct `framebuffer` with the next frame data as 8-bit RGBA data, stored in a flattened byte array in row-major order where each pixel is represented by four consecutive bytes representing the R, G, B and A components of that pixel. Note that the A (alpha) component will always be 255. When iteration over the entire video file is not required, we can lookup a specific frame by calling `ReadFrame(n int)`. By calling `ReadFrames(n ...int)`, we can immediately access multiple frames as a slice of RGBA images and skip the `framebuffer`.
```go
vidio.NewVideo(filename string) (*vidio.Video, error)
@ -39,7 +39,7 @@ SetFrameBuffer(buffer []byte) error
Read() bool
ReadFrame(n int) error
ReadFrames(n ...int) ([][]byte, error)
ReadFrames(n ...int) ([]*image.RGBA, error)
Close()
```
@ -208,12 +208,9 @@ video, _ := vidio.NewVideo("video.mp4")
frames, _ := video.ReadFrames(0, video.Frames() - 1)
img := image.NewRGBA(image.Rect(0, 0, video.Width(), video.Height()))
for index, frame := range frames {
copy(img.Pix, frame)
f, _ := os.Create(fmt.Sprintf("%d.jpg", index))
jpeg.Encode(f, img, nil)
jpeg.Encode(f, frame, nil)
f.Close()
}
```