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Change VideoSampleResource interface, validate return values, add more proper VideoSample.copyTo() logic, fix decoder/encoder color space issues

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This commit is contained in:
Vanilagy
2026-05-08 19:37:41 +02:00
parent f5bd540863
commit ab9958234a
7 changed files with 831 additions and 654 deletions
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packages/server/src/misc.ts
+45 -2
View File
@@ -1,12 +1,14 @@
import { VideoSamplePixelFormat, VideoCodec } from 'mediabunny';
import { VideoSamplePixelFormat, MediaCodec } from 'mediabunny';
import * as NodeAv from 'node-av';
export const CODEC_TO_CODEC_ID: Record<VideoCodec, NodeAv.AVCodecID> = {
export const CODEC_TO_CODEC_ID: Partial<Record<MediaCodec, NodeAv.AVCodecID>> = {
avc: NodeAv.AV_CODEC_ID_H264,
hevc: NodeAv.AV_CODEC_ID_HEVC,
vp8: NodeAv.AV_CODEC_ID_VP8,
vp9: NodeAv.AV_CODEC_ID_VP9,
av1: NodeAv.AV_CODEC_ID_AV1,
aac: NodeAv.AV_CODEC_ID_AAC,
};
let cachedHardwareContext: NodeAv.HardwareContext | null | undefined = undefined;
@@ -180,3 +182,44 @@ export const fromPixelFormat = (pixelFormat: VideoSamplePixelFormat) => {
default: return NodeAv.AV_PIX_FMT_NONE;
}
};
export const toAudioSampleFormat = (ffmpegSampleFormat: NodeAv.AVSampleFormat): AudioSampleFormat | null => {
switch (ffmpegSampleFormat) {
case NodeAv.AV_SAMPLE_FMT_U8: return 'u8';
case NodeAv.AV_SAMPLE_FMT_S16: return 's16';
case NodeAv.AV_SAMPLE_FMT_S32: return 's32';
case NodeAv.AV_SAMPLE_FMT_FLT: return 'f32';
case NodeAv.AV_SAMPLE_FMT_U8P: return 'u8-planar';
case NodeAv.AV_SAMPLE_FMT_S16P: return 's16-planar';
case NodeAv.AV_SAMPLE_FMT_S32P: return 's32-planar';
case NodeAv.AV_SAMPLE_FMT_FLTP: return 'f32-planar';
default: return null;
}
};
export const fromAudioSampleFormat = (sampleFormat: AudioSampleFormat): NodeAv.AVSampleFormat => {
switch (sampleFormat) {
case 'u8': return NodeAv.AV_SAMPLE_FMT_U8;
case 's16': return NodeAv.AV_SAMPLE_FMT_S16;
case 's32': return NodeAv.AV_SAMPLE_FMT_S32;
case 'f32': return NodeAv.AV_SAMPLE_FMT_FLT;
case 'u8-planar': return NodeAv.AV_SAMPLE_FMT_U8P;
case 's16-planar': return NodeAv.AV_SAMPLE_FMT_S16P;
case 's32-planar': return NodeAv.AV_SAMPLE_FMT_S32P;
case 'f32-planar': return NodeAv.AV_SAMPLE_FMT_FLTP;
default: return NodeAv.AV_SAMPLE_FMT_NONE;
}
};
export const getChannelLayout = (numChannels: number): NodeAv.ChannelLayout => {
switch (numChannels) {
case 1: return NodeAv.AV_CHANNEL_LAYOUT_MONO;
case 2: return NodeAv.AV_CHANNEL_LAYOUT_STEREO;
case 4: return NodeAv.AV_CHANNEL_LAYOUT_QUAD;
case 6: return NodeAv.AV_CHANNEL_LAYOUT_5POINT1;
case 8: return NodeAv.AV_CHANNEL_LAYOUT_7POINT1;
default: return { nbChannels: numChannels, order: NodeAv.AV_CHANNEL_ORDER_UNSPEC, mask: 0n };
}
};
packages/server/src/video-decoder.ts
+9 -33
View File
@@ -1,13 +1,7 @@
import { CustomVideoDecoder, VideoCodec, EncodedPacket, VideoSample, MaybePromise, Rational } from 'mediabunny';
import * as NodeAv from 'node-av';
import {
CODEC_TO_CODEC_ID,
getHardwareDecoderCodec,
mapColorPrimaries,
mapMatrixCoefficients,
mapTransferCharacteristics,
} from './misc';
import { binarySearchLessOrEqual, simplifyRational, toUint8Array } from '../../../src/misc';
import { CODEC_TO_CODEC_ID, getHardwareDecoderCodec } from './misc';
import { assert, binarySearchLessOrEqual, simplifyRational, toUint8Array } from '../../../src/misc';
import { NodeAvFrameVideoSampleResource } from './video-sample';
export class NodeAvVideoDecoder extends CustomVideoDecoder {
@@ -37,6 +31,7 @@ export class NodeAvVideoDecoder extends CustomVideoDecoder {
this.packet.alloc();
const codecId = CODEC_TO_CODEC_ID[this.codec];
assert(codecId !== undefined);
let codec: NodeAv.Codec | null;
if (this.config.hardwareAcceleration !== 'prefer-hardware' || this.codec === 'av1') {
@@ -67,30 +62,6 @@ export class NodeAvVideoDecoder extends CustomVideoDecoder {
: null;
codecContext.sampleAspectRatio = new NodeAv.Rational(this.pixelAspectRatio.num, this.pixelAspectRatio.den);
if (this.config.colorSpace?.primaries) {
const mapped = mapColorPrimaries(this.config.colorSpace.primaries);
if (mapped !== null) {
codecContext.colorPrimaries = mapped;
}
}
if (this.config.colorSpace?.transfer) {
const mapped = mapTransferCharacteristics(this.config.colorSpace.transfer);
if (mapped !== null) {
codecContext.colorTrc = mapped;
}
}
if (this.config.colorSpace?.matrix) {
const mapped = mapMatrixCoefficients(this.config.colorSpace.matrix);
if (mapped !== null) {
codecContext.colorSpace = mapped;
}
}
if (this.config.colorSpace?.fullRange != null) {
codecContext.colorRange = this.config.colorSpace.fullRange
? NodeAv.AVCOL_RANGE_JPEG
: NodeAv.AVCOL_RANGE_MPEG;
}
const ret = await codecContext.open2();
NodeAv.FFmpegError.throwIfError(ret, 'Open codec context');
@@ -178,7 +149,12 @@ export class NodeAvVideoDecoder extends CustomVideoDecoder {
}
}
this.onSample(new VideoSample(new NodeAvFrameVideoSampleResource(this.frame), {
const clone = this.frame.clone();
if (!clone) {
throw new Error('Frame clone allocation failed.');
}
this.onSample(new VideoSample(new NodeAvFrameVideoSampleResource(clone), {
timestamp,
duration,
}));
packages/server/src/video-encoder.ts
+1 -11
View File
@@ -35,7 +35,6 @@ export class NodeAvVideoEncoder extends CustomVideoEncoder {
avCodec!: NodeAv.Codec;
codecContext: NodeAv.CodecContext | null = null;
lastBuffer: Buffer | null = null;
colorSpaceSet = false;
packetEmitted = false;
scaler: NodeAv.SoftwareScaleContext | null = null;
@@ -65,6 +64,7 @@ export class NodeAvVideoEncoder extends CustomVideoEncoder {
this.packet.alloc();
const codecId = CODEC_TO_CODEC_ID[this.codec];
assert(codecId !== undefined);
let codec: NodeAv.Codec | null = null;
if (this.config.hardwareAcceleration === 'prefer-software') {
@@ -203,15 +203,6 @@ export class NodeAvVideoEncoder extends CustomVideoEncoder {
this.frame.fromBuffer(this.lastBuffer);
}
if (!this.colorSpaceSet) {
this.codecContext.colorPrimaries = this.frame.colorPrimaries;
this.codecContext.colorTrc = this.frame.colorTrc;
this.codecContext.colorSpace = this.frame.colorSpace;
this.codecContext.colorRange = this.frame.colorRange;
this.colorSpaceSet = true;
}
let frameToEncode = this.frame;
const requiresScaler
@@ -550,7 +541,6 @@ export class NodeAvVideoEncoder extends CustomVideoEncoder {
}
this.packetEmitted = false;
this.colorSpaceSet = false;
}
close(): MaybePromise<void> {
packages/server/src/video-sample.ts
+60 -450
View File
@@ -1,20 +1,27 @@
import assert from 'assert';
import { Rectangle, VideoSamplePixelFormat } from 'mediabunny';
import { VideoSamplePixelFormat } from 'mediabunny';
import { VideoSampleColorSpace } from 'mediabunny';
import { VideoSampleResource } from 'mediabunny';
import * as NodeAv from 'node-av';
import { toUint8Array } from '../../../src/misc';
import { getPlaneConfigs } from '../../../src/sample';
import { MaybePromise, toUint8Array } from '../../../src/misc';
import { VideoDataPlane, VideoSample } from '../../../src/sample';
import {
toPixelFormat,
unmapColorPrimaries,
unmapTransferCharacteristics,
unmapMatrixCoefficients,
fromPixelFormat,
mapColorPrimaries,
mapTransferCharacteristics,
mapMatrixCoefficients,
} from './misc';
import { SetRequired } from 'mediabunny';
import { VideoSampleInit } from 'mediabunny';
const JPEG_RANGE_PIX_FORMATS = new Set([
NodeAv.AV_PIX_FMT_YUVJ411P,
NodeAv.AV_PIX_FMT_YUVJ420P,
NodeAv.AV_PIX_FMT_YUVJ422P,
NodeAv.AV_PIX_FMT_YUVJ440P,
NodeAv.AV_PIX_FMT_YUVJ444P,
]);
export class NodeAvFrameVideoSampleResource extends VideoSampleResource {
frame: NodeAv.Frame;
@@ -22,12 +29,7 @@ export class NodeAvFrameVideoSampleResource extends VideoSampleResource {
constructor(frame: NodeAv.Frame) {
super();
const clone = frame.clone();
if (!clone) {
throw new Error('Allocation failure during frame clone.');
}
this.frame = clone;
this.frame = frame;
}
getFormat(): VideoSamplePixelFormat | null {
@@ -63,7 +65,12 @@ export class NodeAvFrameVideoSampleResource extends VideoSampleResource {
primaries: unmapColorPrimaries(this.frame.colorPrimaries) as VideoColorPrimaries | null,
transfer: unmapTransferCharacteristics(this.frame.colorTrc) as VideoTransferCharacteristics | null,
matrix: unmapMatrixCoefficients(this.frame.colorSpace) as VideoMatrixCoefficients | null,
fullRange: this.frame.colorRange === NodeAv.AVCOL_RANGE_JPEG,
fullRange: this.frame.colorRange === NodeAv.AVCOL_RANGE_JPEG
|| JPEG_RANGE_PIX_FORMATS.has(this.frame.format as NodeAv.AVPixelFormat)
? true
: this.frame.colorRange === NodeAv.AVCOL_RANGE_MPEG
? false
: null,
});
}
@@ -71,450 +78,53 @@ export class NodeAvFrameVideoSampleResource extends VideoSampleResource {
this.frame.free();
}
allocationSize(options: VideoFrameCopyToOptions): number {
// 3. Let combinedLayout be the result of running the Parse VideoFrameCopyToOptions algorithm with options.
// 4. If combinedLayout is an exception, throw combinedLayout.
const combinedLayout = ParseVideoFrameCopyToOptions(this, options);
getDataPlanes(): MaybePromise<VideoDataPlane[]> {
assert(this.frame.data);
// 5. Return combinedLayout's allocationSize.
return combinedLayout.allocationSize;
return this.frame.data.map((data, i) => ({
data: toUint8Array(data),
stride: this.frame.linesize[i]!,
}));
}
async copyTo(
destination: AllowSharedBufferSource,
options: VideoFrameCopyToOptions,
): Promise<PlaneLayout[]> {
const format = this.getFormat();
assert(format !== null);
async toRgbSample(
init: SetRequired<VideoSampleInit, 'timestamp'>,
format: 'RGBA' | 'RGBX' | 'BGRA' | 'BGRX',
// Will respect it when somebody complains
// eslint-disable-next-line @typescript-eslint/no-unused-vars
colorSpace: PredefinedColorSpace,
): Promise<VideoSample> {
const width = this.frame.width;
const height = this.frame.height;
// 3. Let combinedLayout be the result of running the Parse VideoFrameCopyToOptions algorithm with options.
const combinedLayout = ParseVideoFrameCopyToOptions(this, options);
const scaler = new NodeAv.SoftwareScaleContext();
const srcFmt = this.frame.format as NodeAv.AVPixelFormat;
const dstFmt = fromPixelFormat(format);
// 4. If destination.byteLength is less than combinedLayout’s allocationSize, return a promise rejected with
// // eslint-disable-next-line @stylistic/max-len
const destBytes = toUint8Array(destination);
if (destBytes.byteLength < combinedLayout.allocationSize) {
throw new TypeError(
`Destination buffer too small. Required: ${combinedLayout.allocationSize},`
+ ` Available: ${destBytes.byteLength}`,
);
scaler.getContext(
width, height, srcFmt,
width, height, dstFmt,
NodeAv.SWS_BILINEAR,
);
const dstFrame = new NodeAv.Frame();
dstFrame.width = width;
dstFrame.height = height;
dstFrame.format = dstFmt;
dstFrame.alloc();
dstFrame.allocBuffer();
const srcFrame = this.frame;
try {
await scaler.scaleFrame(dstFrame, srcFrame);
} finally {
scaler.freeContext();
}
// 5. If options.format is equal to one of RGBA, RGBX, BGRA, BGRX then:
if (options.format && ['RGBA', 'RGBX', 'BGRA', 'BGRX'].includes(options.format) && options.format !== format) {
// Let newOptions be the result of running the Clone Configuration algorithm with options.
// Assign undefined to newOptions.format.
const newOptions = { ...options };
delete newOptions.format;
dstFrame.format = dstFmt; // FFmpeg messes up RGBA and RGBX
dstFrame.sampleAspectRatio = srcFrame.sampleAspectRatio;
// Let rgbFrame be the result of running the Convert to RGB frame algorithm with this, options.format,
// and options.colorSpace.
const rgbFrame = await ConvertToRGBFrame(this, options.format, options.colorSpace);
// Return the result of calling copyTo() on rgbFrame with destination and newOptions.
try {
const result = await rgbFrame.copyTo(destination, newOptions);
rgbFrame.close();
return result;
} catch (e) {
rgbFrame.close();
throw e;
}
}
// 6. Let p be a new Promise. (Implicit)
// 7. Let copyStepsQueue be the result of starting a new parallel queue. (Implicit)
// 8. Let planeLayouts be a new list.
const planeLayouts: PlaneLayout[] = [];
// Enqueue the following steps to copyStepsQueue: (fuck the queuing part)
// Let resource be the media resource referenced by [[resource reference]].
// (this.data)
// Let numPlanes be the number of planes as defined by [[format]].
const planes = getPlaneConfigs(format);
const numPlanes = planes.length;
// Let planeIndex be 0.
// While planeIndex is less than combinedLayout’s numPlanes:
for (let planeIndex = 0; planeIndex < numPlanes; planeIndex++) {
const computedLayout = combinedLayout.computedLayouts[planeIndex]!;
// Let sourceStride be the stride of the plane in resource as identified by planeIndex.
let sourceStride = 0;
let sourceStartOffset = 0;
sourceStride = this.frame.linesize[planeIndex]!;
const planeBuffer = this.frame.data![planeIndex]!;
if (!planeBuffer) {
throw new Error(`Missing data for plane ${planeIndex}`);
}
const sourceData = new Uint8Array(planeBuffer.buffer, planeBuffer.byteOffset, planeBuffer.byteLength);
sourceStartOffset = 0;
// Let sourceOffset be the product of multiplying computedLayout’s sourceTop by sourceStride
let sourceOffset = computedLayout.sourceTop * sourceStride;
// Add computedLayout’s sourceLeftBytes to sourceOffset.
sourceOffset += computedLayout.sourceLeftBytes;
// Adjust for the base offset of the plane in the source buffer
sourceOffset += sourceStartOffset;
// Let destinationOffset be computedLayout’s destinationOffset.
let destinationOffset = computedLayout.destinationOffset;
// Let rowBytes be computedLayout’s sourceWidthBytes.
const rowBytes = computedLayout.sourceWidthBytes;
// Let layout be a new PlaneLayout, with offset set to destinationOffset and stride set to rowBytes.
// This is a spec error actually (https://github.com/w3c/webcodecs/issues/918)
const layout: PlaneLayout = {
offset: destinationOffset,
stride: computedLayout.destinationStride,
};
// Let row be 0.
// While row is less than computedLayout’s sourceHeight:
for (let row = 0; row < computedLayout.sourceHeight; row++) {
// Copy rowBytes bytes from resource starting at sourceOffset to destination starting
// at destinationOffset.
if (sourceOffset + rowBytes > sourceData.byteLength) {
throw new Error(`Source buffer OOB read`);
}
if (destinationOffset + rowBytes > destBytes.byteLength) {
throw new Error(`Destination buffer OOB write`);
}
const srcSub = sourceData.subarray(sourceOffset, sourceOffset + rowBytes);
destBytes.set(srcSub, destinationOffset);
// Increment sourceOffset by sourceStride.
sourceOffset += sourceStride;
// Increment destinationOffset by computedLayout’s destinationStride.
destinationOffset += computedLayout.destinationStride;
}
// Append layout to planeLayouts.
planeLayouts.push(layout);
}
// Queue a task to resolve p with planeLayouts.
return planeLayouts;
return new VideoSample(new NodeAvFrameVideoSampleResource(dstFrame), init);
}
}
type CombinedBufferLayout = {
allocationSize: number;
computedLayouts: ComputedPlaneLayout[];
};
type ComputedPlaneLayout = {
destinationOffset: number;
destinationStride: number;
sourceTop: number;
sourceHeight: number;
sourceLeftBytes: number;
sourceWidthBytes: number;
};
// Taken from the WebCodecs spec
const ParseVideoFrameCopyToOptions = (
frame: VideoSampleResource,
options: VideoFrameCopyToOptions,
): CombinedBufferLayout => {
// 1. Let defaultRect be the result of performing the getter steps for visibleRect.
const defaultRect: Rectangle = {
left: 0,
top: 0,
width: frame.getCodedWidth(),
height: frame.getCodedHeight(),
};
// 2. Let overrideRect be undefined.
// 3. If options.rect exists, assign the value of options.rect to overrideRect.
const overrideRect = options.rect;
// 4. Let parsedRect be the result of running the Parse Visible Rect algorithm...
const parsedRect = ParseVisibleRect(
defaultRect,
overrideRect,
frame.getCodedWidth(),
frame.getCodedHeight(),
frame.getFormat(),
);
// 5. If parsedRect is an exception, return parsedRect. (Handled by throw)
// 6. Let optLayout be undefined.
// 7. If options.layout exists, assign its value to optLayout.
const optLayout = options.layout;
// 8. Let format be undefined.
let format: VideoSamplePixelFormat | undefined;
// 9. If options.format does not exist, assign [[format]] to format.
if (!options.format || options.format === frame.getFormat()) {
format = frame.getFormat()!;
} else if (['RGBA', 'RGBX', 'BGRA', 'BGRX'].includes(options.format)) {
// 10. Otherwise, if options.format is equal to one of RGBA, RGBX, BGRA, BGRX, then assign options.format
// to format...
format = options.format;
} else {
throw new Error('NotSupportedError: Invalid destination format');
}
// 11. Let combinedLayout be the result of running the Compute Layout and Allocation Size algorithm...
return ComputeLayoutAndAllocationSize(parsedRect, format, optLayout);
};
// Taken from the WebCodecs spec
const ParseVisibleRect = (
defaultRect: DOMRectInit,
overrideRect: DOMRectInit | undefined,
codedWidth: number,
codedHeight: number,
format: VideoSamplePixelFormat | null,
): DOMRectInit => {
// 1. Let sourceRect be defaultRect
const sourceRect = { ...defaultRect };
// 2. If overrideRect is not undefined:
if (overrideRect !== undefined) {
// If either of overrideRect.width or height is 0, return a TypeError.
if (overrideRect.width === 0 || overrideRect.height === 0) {
throw new TypeError('visibleRect dimensions cannot be zero');
}
// If the sum of overrideRect.x and overrideRect.width is greater than codedWidth, return a TypeError.
if ((overrideRect.x || 0) + (overrideRect.width || 0) > codedWidth) {
throw new TypeError('visibleRect exceeds codedWidth');
}
// If the sum of overrideRect.y and overrideRect.height is greater than codedHeight, return a TypeError.
if ((overrideRect.y || 0) + (overrideRect.height || 0) > codedHeight) {
throw new TypeError('visibleRect exceeds codedHeight');
}
// Assign overrideRect to sourceRect.
sourceRect.x = overrideRect.x || 0;
sourceRect.y = overrideRect.y || 0;
sourceRect.width = overrideRect.width || 0;
sourceRect.height = overrideRect.height || 0;
}
// 3. Let validAlignment be the result of running the Verify Rect Offset Alignment algorithm.
const validAlignment = VerifyRectOffsetAlignment(format, sourceRect);
// 4. If validAlignment is false, throw a TypeError.
if (!validAlignment) {
throw new TypeError('visibleRect alignment is invalid for the format');
}
// 5. Return sourceRect.
return sourceRect;
};
// Taken from the WebCodecs spec
const VerifyRectOffsetAlignment = (format: VideoSamplePixelFormat | null, rect: DOMRectInit): boolean => {
// 1. If format is null, return true.
if (format === null) return true;
const planes = getPlaneConfigs(format);
// 2. Let planeIndex be 0.
// 3. Let numPlanes be the number of planes as defined by format.
// 4. While planeIndex is less than numPlanes:
for (let planeIndex = 0; planeIndex < planes.length; planeIndex++) {
const plane = planes[planeIndex]!;
const sampleWidth = plane.widthDivisor;
const sampleHeight = plane.heightDivisor;
// If rect.x is not a multiple of sampleWidth, return false.
if ((rect.x || 0) % sampleWidth !== 0) return false;
// If rect.y is not a multiple of sampleHeight, return false.
if ((rect.y || 0) % sampleHeight !== 0) return false;
}
return true;
};
// Taken from the WebCodecs spec
const ComputeLayoutAndAllocationSize = (
parsedRect: DOMRectInit,
format: VideoSamplePixelFormat,
layout?: PlaneLayout[],
): CombinedBufferLayout => {
const planes = getPlaneConfigs(format);
// 1. Let numPlanes be the number of planes as defined by format.
const numPlanes = planes.length;
// 2. If layout is not undefined and its length does not equal numPlanes, throw a TypeError.
if (layout !== undefined && layout.length !== numPlanes) {
throw new TypeError(`Layout must have ${numPlanes} planes`);
}
// 3. Let minAllocationSize be 0.
let minAllocationSize = 0;
// 4. Let computedLayouts be a new list.
const computedLayouts: ComputedPlaneLayout[] = [];
// 5. Let endOffsets be a new list.
const endOffsets: number[] = [];
// 6. Let planeIndex be 0.
// 7. While planeIndex < numPlanes:
for (let planeIndex = 0; planeIndex < numPlanes; planeIndex++) {
const plane = planes[planeIndex]!;
const sampleBytes = plane.sampleBytes;
const sampleWidth = plane.widthDivisor;
const sampleHeight = plane.heightDivisor;
// Let computedLayout be a new computed plane layout.
const computedLayout: ComputedPlaneLayout = {
destinationOffset: 0,
destinationStride: 0,
sourceTop: 0,
sourceHeight: 0,
sourceLeftBytes: 0,
sourceWidthBytes: 0,
};
// Set computedLayout’s sourceTop...
computedLayout.sourceTop = Math.ceil(Math.trunc(parsedRect.y || 0) / sampleHeight);
// Set computedLayout’s sourceHeight...
computedLayout.sourceHeight = Math.ceil(Math.trunc(parsedRect.height || 0) / sampleHeight);
// Set computedLayout’s sourceLeftBytes...
computedLayout.sourceLeftBytes = Math.floor(Math.trunc(parsedRect.x || 0) / sampleWidth) * sampleBytes;
// Set computedLayout’s sourceWidthBytes...
computedLayout.sourceWidthBytes = Math.floor(Math.trunc(parsedRect.width || 0) / sampleWidth) * sampleBytes;
// If layout is not undefined:
if (layout !== undefined) {
const planeLayout = layout[planeIndex]!;
// If planeLayout.stride is less than computedLayout’s sourceWidthBytes, return a TypeError.
if (planeLayout.stride < computedLayout.sourceWidthBytes) {
throw new TypeError(`Stride for plane ${planeIndex} is too small`);
}
// Assign planeLayout.offset to computedLayout’s destinationOffset.
computedLayout.destinationOffset = planeLayout.offset;
// Assign planeLayout.stride to computedLayout’s destinationStride.
computedLayout.destinationStride = planeLayout.stride;
} else {
// Otherwise:
// Assign minAllocationSize to computedLayout’s destinationOffset.
computedLayout.destinationOffset = minAllocationSize;
// Assign computedLayout’s sourceWidthBytes to computedLayout’s destinationStride.
computedLayout.destinationStride = computedLayout.sourceWidthBytes;
}
// Let planeSize be the product of multiplying computedLayout’s destinationStride and sourceHeight.
const planeSize = computedLayout.destinationStride * computedLayout.sourceHeight;
// Let planeEnd be the sum of planeSize and computedLayout’s destinationOffset.
const planeEnd = planeSize + computedLayout.destinationOffset;
// If planeSize or planeEnd is greater than maximum range of unsigned long, return a TypeError.
if (planeEnd > 4294967295) throw new TypeError('Allocation size exceeds limit');
// Append planeEnd to endOffsets.
endOffsets.push(planeEnd);
// Assign the maximum of minAllocationSize and planeEnd to minAllocationSize.
minAllocationSize = Math.max(minAllocationSize, planeEnd);
// Check for overlap
for (let earlierPlaneIndex = 0; earlierPlaneIndex < planeIndex; earlierPlaneIndex++) {
const earlierLayout = computedLayouts[earlierPlaneIndex]!;
// If plane A ends before plane B starts, they do not overlap.
if (
endOffsets[planeIndex]! <= earlierLayout.destinationOffset
|| endOffsets[earlierPlaneIndex]! <= computedLayout.destinationOffset
) {
continue;
}
throw new TypeError('Planes overlap');
}
computedLayouts.push(computedLayout);
}
// 12. Return combinedLayout.
return {
allocationSize: minAllocationSize,
computedLayouts: computedLayouts,
};
};
// Taken from the WebCodecs spec
const ConvertToRGBFrame = async (
frame: NodeAvFrameVideoSampleResource,
format: VideoPixelFormat,
colorSpace?: PredefinedColorSpace,
): Promise<NodeAvFrameVideoSampleResource> => {
// 1. Let convertedFrame be a new VideoFrame...
// (We construct it at the end, but we prepare the resource here)
const width = frame.getCodedWidth();
const height = frame.getCodedHeight();
const scaler = new NodeAv.SoftwareScaleContext();
const srcFmt = fromPixelFormat(frame.getFormat()!);
const dstFmt = fromPixelFormat(format);
// Configure scaling: Source -> Destination (Visible Size)
scaler.getContext(
width, height, srcFmt,
width, height, dstFmt,
NodeAv.SWS_BILINEAR,
);
// Allocate destination frame
const dstFrame = new NodeAv.Frame();
dstFrame.width = width;
dstFrame.height = height;
dstFrame.format = dstFmt;
dstFrame.alloc();
dstFrame.allocBuffer();
// Apply destination color space settings to dstFrame
// If colorSpace is not provided, srgb is used
const targetColorSpace = colorSpace || 'srgb';
if (targetColorSpace === 'srgb') {
dstFrame.colorPrimaries = NodeAv.AVCOL_PRI_BT709;
dstFrame.colorTrc = NodeAv.AVCOL_TRC_IEC61966_2_1;
dstFrame.colorSpace = NodeAv.AVCOL_SPC_RGB;
dstFrame.colorRange = NodeAv.AVCOL_RANGE_JPEG;
} else if (targetColorSpace === 'display-p3') {
dstFrame.colorPrimaries = NodeAv.AVCOL_PRI_SMPTE432;
dstFrame.colorTrc = NodeAv.AVCOL_TRC_IEC61966_2_1;
dstFrame.colorSpace = NodeAv.AVCOL_SPC_RGB;
dstFrame.colorRange = NodeAv.AVCOL_RANGE_JPEG;
}
const srcFrame = frame.frame;
// Apply source color space settings to srcFrame (if known)
// This ensures the scaler knows the input color space for correct conversion
const frameColorSpace = frame.getColorSpace();
if (colorSpace) {
srcFrame.colorPrimaries = mapColorPrimaries(frameColorSpace.primaries ?? 'unknown')
?? NodeAv.AVCOL_PRI_UNSPECIFIED;
srcFrame.colorTrc = mapTransferCharacteristics(frameColorSpace.transfer ?? 'unknown')
?? NodeAv.AVCOL_TRC_UNSPECIFIED;
srcFrame.colorSpace = mapMatrixCoefficients(frameColorSpace.matrix ?? 'unknown')
?? NodeAv.AVCOL_SPC_UNSPECIFIED;
srcFrame.colorRange = frameColorSpace.fullRange
? NodeAv.AVCOL_RANGE_JPEG
: NodeAv.AVCOL_RANGE_MPEG;
}
try {
await scaler.scaleFrame(dstFrame, srcFrame);
} finally {
scaler.freeContext();
}
return new NodeAvFrameVideoSampleResource(dstFrame);
};