internal static string ErrorMessage(
int sourceWidth, int sourceHeight, PixelFormat sourcePixelFormat,
int destWidth, int destHeight, PixelFormat destPixelFormat,
ScaleFlag flags) =>
string.Format("Impossible to create scale context for the conversion fmt:{0} s:{1}x{2} -> fmt:{3} s:{4}x{5} (sws_flags: {6})",
PixelUtils.GetPixelFormatName(sourcePixelFormat), sourceWidth, sourceHeight,
PixelUtils.GetPixelFormatName(destPixelFormat), destWidth, destHeight, flags);
/// <summary>
/// <see cref="sws_getContext(int, int, AVPixelFormat, int, int, AVPixelFormat, int, SwsFilter*, SwsFilter*, double*)"/>
/// </summary>
public PixelConverter(
int sourceWidth, int sourceHeight, PixelFormat sourcePixelFormat,
int destWidth, int destHeight, PixelFormat destPixelFormat,
ScaleFlag flags = ScaleFlag.Bilinear)
{
_nativePointer = NativeUtils.NotNull(
ptr: (IntPtr)sws_getContext(
sourceWidth, sourceHeight, (AVPixelFormat)sourcePixelFormat,
destWidth, destHeight, (AVPixelFormat)destPixelFormat,
flags: (int)flags,
srcFilter: null,
dstFilter: null,
param: null),
message: ErrorMessage(sourceWidth, sourceHeight, sourcePixelFormat, destWidth, destHeight, destPixelFormat, flags));
_isOwner = true;
}
/// <summary>
/// <see cref="sws_getCachedContext(SwsContext*, int, int, AVPixelFormat, int, int, AVPixelFormat, int, SwsFilter*, SwsFilter*, double*)"/>
/// <see cref="sws_scale(SwsContext*, byte*[], int[], int, int, byte*[], int[])"/>
/// </summary>
public void ConvertFrame(Frame sourceFrame, Frame destFrame, ScaleFlag flags = ScaleFlag.Bilinear)
{
_nativePointer = NativeUtils.NotNull(
ptr: (IntPtr)sws_getCachedContext(this,
sourceFrame.Width, sourceFrame.Height, (AVPixelFormat)sourceFrame.Format,
destFrame.Width, destFrame.Height, (AVPixelFormat)destFrame.Format,
flags: (int)flags,
srcFilter: null, dstFilter: null, param: null),
message: PixelConverter.ErrorMessage(
sourceFrame.Width, sourceFrame.Height, (PixelFormat)sourceFrame.Format,
destFrame.Width, destFrame.Height, (PixelFormat)destFrame.Format, flags));
sws_scale(this,
srcSlice: ((Ptr4)sourceFrame.Data).ToBytePtrArray(),
srcStride: ((Int32x4)sourceFrame.Linesize).ToArray(),
srcSliceY: 0, srcSliceH: sourceFrame.Height,
dst: ((Ptr4)destFrame.Data).ToBytePtrArray(), ((Int32x4)destFrame.Linesize).ToArray()).ThrowIfError();
}
/// <summary>
/// <see cref="sws_getCachedContext(SwsContext*, int, int, AVPixelFormat, int, int, AVPixelFormat, int, SwsFilter*, SwsFilter*, double*)"/>
/// <see cref="sws_scale(SwsContext*, byte*[], int[], int, int, byte*[], int[])"/>
/// </summary>
public static IEnumerable <Frame> ConvertFrames(this CodecContext c, IEnumerable <Frame> sourceFrames, ScaleFlag flags = ScaleFlag.Bilinear)
{
using var destFrame = c.CreateFrame();
int pts = 0;
if (c.Codec.Type == MediaType.Video)
{
using var frameConverter = new FrameConverter();
foreach (var sourceFrame in sourceFrames)
{
frameConverter.ConvertFrame(sourceFrame, destFrame, flags);
destFrame.Pts = pts++;
yield return(destFrame);
}
}
else if (c.Codec.Type == MediaType.Audio)
{
using var frameConverter = new SampleConverter();
foreach (var sourceFrame in sourceFrames)
{
frameConverter.ConvertFrame(destFrame, sourceFrame);
destFrame.Pts = pts += c.FrameSize;
yield return(destFrame);
}
}
}
