public async Task <bool> Render(
ThumbnailsRenderContext ctx,
ThumbnailsRenderFileInfo fileInfo,
ThumbnailsRenderOption option)
{
await _fileService.ReadFileStream(fileInfo.FileHandle, videoStream =>
{
using var formatContext = new FormatContext(videoStream);
var attachedPicStream = formatContext.FindAttachedPicStream();
if (attachedPicStream != null)
{
DrawAttachedPicture(ctx, attachedPicStream);
}
else
{
var audioStream = formatContext.FindBestAudioStream();
if (audioStream == null)
{
throw new InvalidDataException("No audio stream found");
}
DrawWaves(ctx, audioStream);
}
return(ValueTask.FromResult(true));
});
return(true);
}