// Real-bitstream tests for the AV1 OBU → CoreMedia plumbing (AV1.swift): the OBU walk, the // sequence-header parse, the `av1C` format description, the sample repack, the VideoCodec // dispatch — and, on AV1-hardware devices, a real VTDecompressionSession decode of the blob // (the AV1 counterpart of VideoToolboxRoundTripTests; there is no VT AV1 *encoder*, so the // bitstream is generated offline). // // Blobs: the first two temporal units of an SVT-AV1 clip — a keyframe TU (temporal delimiter + // sequence header + frame) and a delta TU (temporal delimiter + frame), exactly the wire shape // the punktfunk host emits. Generated with: // ffmpeg -f lavfi -i testsrc2=size=320x180:rate=30 -frames:v 2 \ // -c:v libsvtav1 -preset 12 -crf 63 -g 30 -f obu out.obu // then split on the temporal-delimiter OBUs. 320×180 clears the hardware decoder's // minimum-dimension floor (see Probe444Blobs). Ground truth (ffprobe + a reference parse): // Main profile (0), level_idx 0, tier 0, 8-bit, 4:2:0, no color description (unspecified), // studio range, max frame 320×180, chroma sample position 0. import CoreMedia import VideoToolbox import XCTest @testable import PunktfunkKit /// Sendable holder for the values the (background-thread) decode callback writes. private final class FrameBox: @unchecked Sendable { let lock = NSLock() var frame: ReadyFrame? var error: OSStatus? } final class AV1Tests: XCTestCase { // MARK: - OBU walk func testOBUWalkKeyframe() { var seen: [(type: UInt8, payloadCount: Int)] = [] var lastEnd = 0 AV1.forEachOBU(in: Data(Self.keyframeTU)) { _, header, payload, type in XCTAssertEqual(header.lowerBound, lastEnd, "OBUs must be contiguous") XCTAssertEqual(header.upperBound, payload.lowerBound) lastEnd = payload.upperBound seen.append((type, payload.count)) return true } XCTAssertEqual(lastEnd, Self.keyframeTU.count, "walk must cover the whole TU") XCTAssertEqual(seen.map(\.type), [ AV1.OBUType.temporalDelimiter, AV1.OBUType.sequenceHeader, 6, // 6 = OBU_FRAME ]) XCTAssertEqual(seen[0].payloadCount, 0) XCTAssertEqual(seen[1].payloadCount, 11) } func testOBUWalkStopsEarly() { var calls = 0 AV1.forEachOBU(in: Data(Self.keyframeTU)) { _, _, _, _ in calls += 1 return false } XCTAssertEqual(calls, 1) } func testOBUWalkRejectsGarbage() { // 0x80 = forbidden bit set: not an OBU stream, the walk must not call the body. AV1.forEachOBU(in: Data([0x80, 0x00, 0x01])) { _, _, _, _ in XCTFail("garbage must not yield OBUs") return true } // A size field overrunning the buffer stops the walk at the previous OBU. var truncated = Data([0x12, 0x00]) // valid TD truncated.append(contentsOf: [0x0A, 0x7F, 0x01]) // seq header claiming 127 bytes, 1 present var types: [UInt8] = [] AV1.forEachOBU(in: truncated) { _, _, _, type in types.append(type) return true } XCTAssertEqual(types, [AV1.OBUType.temporalDelimiter]) } // MARK: - Sequence header func testSequenceHeaderParse() throws { // The sequence-header OBU payload sits at bytes 4..<15 (TD 2 bytes, header+size 2 bytes). let payload = Data(Self.keyframeTU[4..<15]) let sh = try XCTUnwrap(AV1.parseSequenceHeader(payload)) XCTAssertEqual(sh.profile, 0) // Main XCTAssertEqual(sh.levelIdx0, 0) XCTAssertEqual(sh.tier0, 0) XCTAssertFalse(sh.highBitdepth) XCTAssertFalse(sh.twelveBit) XCTAssertFalse(sh.monochrome) XCTAssertTrue(sh.subsamplingX) // profile 0 ⇒ 4:2:0 XCTAssertTrue(sh.subsamplingY) XCTAssertEqual(sh.chromaSamplePosition, 0) XCTAssertEqual(sh.colorPrimaries, 2) // no color description ⇒ unspecified XCTAssertEqual(sh.transferCharacteristics, 2) XCTAssertEqual(sh.matrixCoefficients, 2) XCTAssertFalse(sh.fullRange) XCTAssertEqual(sh.maxWidth, 320) XCTAssertEqual(sh.maxHeight, 180) } func testSequenceHeaderRejectsTruncation() { // The parse consumes exactly 79 bits of this header (it stops after // chroma_sample_position — the last field av1C needs), so 10 bytes suffice and the // 11th only carries fields past the parse. Everything shorter must fail cleanly. let payload = Data(Self.keyframeTU[4..<15]) for cut in 0..<10 { XCTAssertNil( AV1.parseSequenceHeader(payload.prefix(cut)), "a header truncated to \(cut) bytes must not parse") } XCTAssertNotNil(AV1.parseSequenceHeader(payload.prefix(10))) } // MARK: - Format description func testFormatDescriptionFromKeyframe() throws { let format = try XCTUnwrap(AV1.formatDescription(fromKeyframe: Data(Self.keyframeTU))) XCTAssertEqual(CMFormatDescriptionGetMediaSubType(format), kCMVideoCodecType_AV1) let dims = CMVideoFormatDescriptionGetDimensions(format) XCTAssertEqual(dims.width, 320) XCTAssertEqual(dims.height, 180) // The av1C record: marker/version, profile+level, the packed flags byte (4:2:0, 8-bit, // csp 0 → 0x0C), no presentation delay — then the sequence-header OBU verbatim. let atoms = try XCTUnwrap( CMFormatDescriptionGetExtension( format, extensionKey: kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms) as? [String: Any]) let av1C = try XCTUnwrap(atoms["av1C"] as? Data) XCTAssertEqual([UInt8](av1C.prefix(4)), [0x81, 0x00, 0x0C, 0x00]) XCTAssertEqual([UInt8](av1C.dropFirst(4)), [UInt8](Self.keyframeTU[2..<15]), "configOBUs must be the size-fielded sequence-header OBU") // Unspecified color codes fall back to BT.709 studio range — and the transfer-function // extension is what keeps VideoDecoder.isHDRFormat working for AV1. let transfer = CMFormatDescriptionGetExtension( format, extensionKey: kCMFormatDescriptionExtension_TransferFunction) as? String XCTAssertEqual(transfer, kCMFormatDescriptionTransferFunction_ITU_R_709_2 as String) XCTAssertFalse(VideoDecoder.isHDRFormat(format)) } func testDeltaTUYieldsNoFormat() { XCTAssertNil(AV1.formatDescription(fromKeyframe: Data(Self.deltaTU)), "a delta TU has no sequence header — the pumps must latch the previous one") } // MARK: - Sample repack func testSampleRepack() throws { let format = try XCTUnwrap(AV1.formatDescription(fromKeyframe: Data(Self.keyframeTU))) let au = AccessUnit( data: Data(Self.keyframeTU), ptsNs: 1_000_000, frameIndex: 0, flags: 0, receivedNs: 0) let sample = try XCTUnwrap(AV1.sampleBuffer(au: au, format: format)) // The blob is already fully size-fielded, so the repack is byte-identical minus the // 2-byte temporal delimiter. let block = try XCTUnwrap(CMSampleBufferGetDataBuffer(sample)) var length = 0 var ptr: UnsafeMutablePointer? XCTAssertEqual(CMBlockBufferGetDataPointer( block, atOffset: 0, lengthAtOffsetOut: nil, totalLengthOut: &length, dataPointerOut: &ptr), noErr) let bytes = UnsafeRawBufferPointer(start: ptr, count: length) XCTAssertEqual([UInt8](bytes), [UInt8](Self.keyframeTU[2...])) // No temporal delimiter survives, and the pts round-trips at nanosecond scale. AV1.forEachOBU(in: Data(bytes)) { _, _, _, type in XCTAssertNotEqual(type, AV1.OBUType.temporalDelimiter) return true } let pts = CMSampleBufferGetPresentationTimeStamp(sample) XCTAssertEqual(pts.value, 1_000_000) XCTAssertEqual(pts.timescale, 1_000_000_000) } func testSampleRepackDelimiterOnlyIsDropped() throws { let format = try XCTUnwrap(AV1.formatDescription(fromKeyframe: Data(Self.keyframeTU))) let au = AccessUnit( data: Data([0x12, 0x00]), ptsNs: 0, frameIndex: 0, flags: 0, receivedNs: 0) XCTAssertNil(AV1.sampleBuffer(au: au, format: format)) } // MARK: - VideoCodec dispatch func testWireCodecResolution() { XCTAssertEqual(VideoCodec(wire: 0x01), .h264) XCTAssertEqual(VideoCodec(wire: 0x02), .hevc) XCTAssertEqual(VideoCodec(wire: 0x04), .av1) XCTAssertEqual(VideoCodec(wire: 0xFF), .hevc) // unknown → the default codec } func testCodecDispatch() { let au = Data(Self.keyframeTU) XCTAssertNotNil(VideoCodec.av1.formatDescription(fromKeyframe: au)) // The same bytes through the NAL paths must not parse — proves the dispatch matters. XCTAssertNil(VideoCodec.hevc.formatDescription(fromKeyframe: au)) XCTAssertNil(VideoCodec.h264.formatDescription(fromKeyframe: au)) } // MARK: - Hardware decode (end to end) /// The AV1 counterpart of VideoToolboxRoundTripTests' decode half: the keyframe blob through /// the REAL VideoDecoder (format description → repack → hardware VTDecompressionSession). /// Pixels out = the whole AV1 decode path is sound. Skipped on devices without AV1 hardware /// (exactly the devices the client never advertises AV1 from). func testHardwareDecodeEndToEnd() throws { try XCTSkipUnless( AV1.hardwareDecodeSupported, "no AV1 hardware decoder — AV1 is never advertised here") let box = FrameBox() let decoded = expectation(description: "decoded frame") let decoder = VideoDecoder( onDecoded: { frame in box.lock.lock() box.frame = frame box.lock.unlock() decoded.fulfill() }, onDecodeError: { status in box.lock.lock() box.error = status box.lock.unlock() decoded.fulfill() }) decoder.setCodec(.av1) let format = try XCTUnwrap(AV1.formatDescription(fromKeyframe: Data(Self.keyframeTU))) let au = AccessUnit( data: Data(Self.keyframeTU), ptsNs: 42_000_000, frameIndex: 0, flags: 0, receivedNs: 1) XCTAssertTrue(decoder.decode(au: au, format: format), "hardware session must accept the keyframe") wait(for: [decoded], timeout: 5) box.lock.lock() let frame = box.frame let error = box.error box.lock.unlock() XCTAssertNil(error.map { "decode error \($0)" }) let ready = try XCTUnwrap(frame) XCTAssertEqual(ready.ptsNs, 42_000_000) XCTAssertFalse(ready.isHDR) XCTAssertEqual(CVPixelBufferGetWidth(ready.pixelBuffer), 320) XCTAssertEqual(CVPixelBufferGetHeight(ready.pixelBuffer), 180) XCTAssertEqual( CVPixelBufferGetPixelFormatType(ready.pixelBuffer), kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange, "SDR AV1 must decode to NV12") decoder.reset() } // MARK: - Blobs /// Keyframe temporal unit (740 bytes). static let keyframeTU: [UInt8] = [ 0x12, 0x00, 0x0a, 0x0b, 0x00, 0x00, 0x00, 0x04, 0x3c, 0xfe, 0xcc, 0x4a, 0xf9, 0x00, 0x40, 0x32, 0xd2, 0x05, 0x10, 0x00, 0x9b, 0xa0, 0x8f, 0xbe, 0x7d, 0xf0, 0xdf, 0xbc, 0xf8, 0x00, 0xdd, 0x6d, 0x69, 0x7f, 0xb3, 0x26, 0x63, 0x5e, 0x79, 0xf4, 0xf5, 0xc5, 0x84, 0xda, 0xcf, 0xec, 0xd8, 0xa6, 0xc1, 0x56, 0x99, 0x43, 0xf0, 0xff, 0x31, 0xd5, 0x41, 0xd8, 0xbb, 0x07, 0x10, 0x5e, 0x42, 0xc5, 0x9b, 0x63, 0xc0, 0x14, 0xe7, 0x28, 0x73, 0xf3, 0x50, 0x12, 0x02, 0x8e, 0x2b, 0x91, 0xd7, 0x3d, 0xc5, 0x33, 0xc9, 0x9b, 0xd9, 0xea, 0xfb, 0xc3, 0x5a, 0xdd, 0xb3, 0x0b, 0x5d, 0xc6, 0xde, 0x1a, 0xca, 0x90, 0x61, 0x0a, 0x77, 0x83, 0xb5, 0x8f, 0x9a, 0x88, 0xf0, 0x3d, 0xa2, 0x78, 0x81, 0x6c, 0xb6, 0x8e, 0x85, 0x90, 0x44, 0xa1, 0xda, 0xa8, 0xf6, 0xcb, 0xa2, 0xf2, 0xb8, 0xb9, 0xac, 0x6b, 0xba, 0xfd, 0x8f, 0x7e, 0x04, 0x32, 0x0d, 0x90, 0xed, 0x5a, 0xe2, 0x1d, 0x8a, 0x03, 0x29, 0x47, 0xde, 0xf6, 0x9a, 0xd4, 0x45, 0x91, 0x17, 0x5c, 0x7b, 0xdf, 0xa3, 0xe2, 0x7a, 0xd9, 0x93, 0xfd, 0x55, 0xeb, 0xd9, 0x3f, 0xa6, 0xec, 0xdd, 0x2a, 0x00, 0xbc, 0x8d, 0x1d, 0x98, 0xa2, 0x39, 0x88, 0x3f, 0x32, 0x3e, 0x18, 0x85, 0x12, 0x46, 0x57, 0x1d, 0x25, 0x8e, 0xcc, 0x41, 0x37, 0xc3, 0x9f, 0xbd, 0x7b, 0xf9, 0xb9, 0xa4, 0x9d, 0x86, 0xf4, 0xcc, 0x2b, 0x5a, 0xf3, 0xbc, 0x77, 0x80, 0xcb, 0xc4, 0xf3, 0x02, 0x91, 0xf6, 0xb8, 0x59, 0x93, 0x33, 0xbe, 0xe2, 0x23, 0xac, 0xb9, 0xe2, 0x69, 0x67, 0xad, 0x63, 0x45, 0x35, 0x94, 0x9e, 0x2e, 0xfa, 0x2b, 0xb9, 0xc3, 0xf9, 0x39, 0x5e, 0xa8, 0x33, 0x4d, 0xf3, 0x5c, 0xbd, 0xe6, 0x5b, 0x50, 0x19, 0xe6, 0xd3, 0xf2, 0x01, 0xcf, 0x35, 0x09, 0xd6, 0x2a, 0x67, 0x17, 0xd2, 0xbd, 0x91, 0xc3, 0x91, 0x17, 0x4a, 0xbc, 0x29, 0xf0, 0xb8, 0xd4, 0xfc, 0x04, 0xac, 0x63, 0xfb, 0x2f, 0xc5, 0xe9, 0xb2, 0x06, 0xac, 0x3c, 0x79, 0x33, 0x5c, 0x73, 0x80, 0x95, 0x0f, 0xad, 0xff, 0xee, 0xed, 0x78, 0xaf, 0xc6, 0x1b, 0xb4, 0xc2, 0x96, 0x5f, 0x7f, 0x20, 0x5f, 0xb6, 0xdb, 0x70, 0xab, 0x60, 0x0b, 0xea, 0xd1, 0xaf, 0x57, 0x71, 0xeb, 0x3b, 0xef, 0xb1, 0x3c, 0x01, 0x72, 0x5b, 0x59, 0x6d, 0x36, 0xe3, 0x16, 0xda, 0x0a, 0x6b, 0xc7, 0x0b, 0xa0, 0xa6, 0x6f, 0x77, 0x4f, 0x0b, 0xe6, 0x62, 0x34, 0x0e, 0xdd, 0xfa, 0xbe, 0x4f, 0x67, 0x21, 0x40, 0xc2, 0xcd, 0xf3, 0x63, 0x9e, 0xb2, 0x28, 0xaf, 0x5b, 0x0e, 0x28, 0xba, 0x91, 0xec, 0xec, 0xf2, 0xf4, 0xdb, 0x9c, 0x51, 0x24, 0x67, 0x77, 0xe0, 0x67, 0x70, 0x51, 0xfb, 0x00, 0x61, 0x50, 0x9f, 0xae, 0x5e, 0x96, 0x2d, 0x1e, 0xa2, 0xab, 0x49, 0x90, 0x90, 0x1c, 0x04, 0x93, 0x8b, 0xc2, 0xee, 0x53, 0x61, 0x62, 0x19, 0x62, 0x5c, 0xff, 0x15, 0x84, 0x7a, 0x5c, 0x70, 0xaa, 0x6d, 0x39, 0xb2, 0xe9, 0x19, 0xd1, 0x9f, 0xf3, 0xb3, 0xb7, 0x05, 0xd2, 0xef, 0x5f, 0xe9, 0x2a, 0x25, 0x55, 0x0a, 0xf3, 0xd2, 0x95, 0xba, 0x22, 0x5f, 0x49, 0x9b, 0x5d, 0xae, 0xeb, 0x51, 0x63, 0x51, 0xa0, 0x85, 0xd6, 0xb6, 0x23, 0x6f, 0x92, 0xbf, 0x99, 0xf3, 0xf9, 0xbf, 0x07, 0xd4, 0x05, 0x1c, 0x6b, 0xe1, 0x42, 0x49, 0xfe, 0x99, 0x4c, 0x6f, 0x34, 0xea, 0x29, 0x14, 0xd5, 0x92, 0x17, 0xfa, 0xc4, 0x35, 0xef, 0x97, 0x31, 0x06, 0xdc, 0xc7, 0x57, 0xe7, 0x79, 0x3d, 0x64, 0xf3, 0x12, 0x0d, 0x60, 0x5d, 0x9d, 0xa5, 0x11, 0xb9, 0xf9, 0x75, 0x3a, 0x59, 0x42, 0x2a, 0xd0, 0xed, 0xb4, 0xa8, 0xee, 0x87, 0x9e, 0x3d, 0x52, 0x47, 0x6c, 0x8f, 0x43, 0x98, 0xd0, 0x72, 0x8b, 0x16, 0xef, 0x2a, 0xaa, 0x9c, 0x42, 0x91, 0xc8, 0x92, 0x85, 0x79, 0xc0, 0xf8, 0xc0, 0x12, 0x44, 0x38, 0x49, 0xdb, 0x5f, 0xfc, 0x7b, 0x6e, 0xac, 0xea, 0x38, 0x3c, 0x3f, 0x49, 0xc2, 0xe7, 0x82, 0xb3, 0x30, 0xf2, 0x7e, 0x31, 0xc2, 0xf8, 0xfc, 0x9a, 0x9e, 0x6d, 0x4c, 0x5f, 0xd4, 0xc0, 0x22, 0xd3, 0x40, 0xc9, 0x66, 0x59, 0x38, 0x14, 0x64, 0x24, 0xc0, 0x0d, 0x56, 0x88, 0x6d, 0x9f, 0x80, 0x71, 0xc8, 0x26, 0x3e, 0x2f, 0xd1, 0xd2, 0x6d, 0x8a, 0xf2, 0x2c, 0x01, 0xbf, 0x89, 0x15, 0xc7, 0x66, 0x3d, 0x19, 0x9f, 0xb8, 0x4c, 0xb9, 0x6f, 0xd7, 0xe8, 0x59, 0xf3, 0xe7, 0xdd, 0x14, 0x3e, 0x99, 0x37, 0x90, 0xb5, 0x2d, 0x49, 0xcc, 0x40, 0xd6, 0xe1, 0x29, 0x4e, 0x31, 0x7c, 0xef, 0xdb, 0x74, 0xf0, 0x9f, 0xa6, 0xdd, 0xbc, 0xd9, 0x65, 0x0f, 0xf7, 0x22, 0xa8, 0xd0, 0xfb, 0x78, 0x49, 0x40, 0xbf, 0x96, 0xa1, 0x5a, 0x7b, 0xc6, 0x60, 0x63, 0x22, 0xad, 0x5d, 0x97, 0xa2, 0x77, 0x3f, 0x58, 0x3b, 0x94, 0xa4, 0xd9, 0xe3, 0xe5, 0xae, 0x0c, 0x30, 0x91, 0xdd, 0x5a, 0xbb, 0xfd, 0x10, 0x6a, 0x22, 0x8f, 0xbd, 0x8c, 0x41, 0xf5, 0xa2, 0x29, 0xd7, 0xad, 0x4e, 0x58, 0xfb, 0x1e, 0x9a, 0x0e, 0x98, 0x54, 0xc1, 0xd7, 0xfb, 0xdf, 0xcc, 0x1d, 0x5d, 0xe3, 0x25, 0x6b, 0x57, 0x69, 0x67, 0x80, 0x0c, 0xb5, 0xcb, 0x01, 0x5a, 0x56, 0x56, 0x01, 0x47, 0xad, 0x6b, 0x26, 0x28, 0x30, 0x36, 0x79, 0x91, 0x62, 0x52, 0x93, 0xa4, 0xe8, 0x52, 0x30, ] /// Delta temporal unit (27 bytes). static let deltaTU: [UInt8] = [ 0x12, 0x00, 0x32, 0x17, 0x30, 0x02, 0x04, 0x09, 0x24, 0x92, 0x22, 0x7f, 0x80, 0x00, 0x01, 0x9f, 0x00, 0x00, 0x00, 0x8b, 0x07, 0x27, 0x7a, 0x64, 0x4c, 0xec, 0xf4, ] }