| <!DOCTYPE html> |
| <!-- |
| Check hardware accelerated scalable video coding and decoding after dropping |
| some chunks. |
| --> |
| <html> |
| |
| <head> |
| <title>SVC encoding test</title> |
| <script src="webcodecs_common.js"></script> |
| <script type="text/javascript"> |
| 'use strict'; |
| const acceleration = 'prefer-hardware'; |
| async function main(arg) { |
| const width = 640; |
| const height = 480; |
| const frames_to_encode = 32; |
| let frames_encoded = 0; |
| let frames_decoded = 0; |
| let errors = 0; |
| const base_layer_decimator = ([null, null, 2, 4])[arg.layers]; |
| let expected_dot_count = []; |
| |
| const encoder_config = { |
| codec: arg.codec, |
| hardwareAcceleration: acceleration, |
| width: width, |
| height: height, |
| bitrate: 2000000, |
| scalabilityMode: "L1T" + arg.layers, |
| latencyMode: "realtime", |
| }; |
| |
| let support = await VideoEncoder.isConfigSupported(encoder_config); |
| if (!support.supported) { |
| TEST.skip('Unsupported codec: ' + arg.codec); |
| return; |
| } |
| |
| let decoder = new VideoDecoder({ |
| output(frame) { |
| frames_decoded++; |
| let dots = expected_dot_count.shift(); |
| // Check that we have intended number of dots and no more. |
| // Completely black frame shouldn't pass the test. |
| if(!validateBlackDots(frame, dots) || |
| validateBlackDots(frame, dots + 1)) { |
| TEST.reportFailure( |
| `Unexpected dot count ts:${frame.timestamp} dots:${dots}`); |
| } |
| |
| frame.close(); |
| }, |
| error(e) { |
| errors++; |
| TEST.log(e); |
| } |
| }); |
| |
| const encoder_init = { |
| output(chunk, metadata) { |
| let config = metadata.decoderConfig; |
| if (config) { |
| decoder.configure(config); |
| } |
| |
| frames_encoded++; |
| TEST.assert(metadata.svc != null); |
| TEST.assert(metadata.svc.temporalLayerId < arg.layers, |
| "too large temporal ID"); |
| if (metadata.svc.temporalLayerId == 0) { |
| decoder.decode(chunk); |
| } |
| }, |
| error(e) { |
| errors++; |
| TEST.log(e); |
| } |
| }; |
| |
| let encoder = new VideoEncoder(encoder_init); |
| encoder.configure(encoder_config); |
| let source = new CanvasSource(width, height); |
| |
| for (let i = 0; i < frames_to_encode; i++) { |
| let frame = await source.getNextFrame(); |
| encoder.encode(frame, { keyFrame: false }); |
| if (i % base_layer_decimator == 0) |
| expected_dot_count.push(i); |
| frame.close(); |
| |
| await waitForNextFrame(); |
| } |
| await encoder.flush(); |
| await decoder.flush(); |
| encoder.close(); |
| decoder.close(); |
| source.close(); |
| |
| TEST.assert( |
| frames_encoded == frames_to_encode, |
| 'frames_encoded mismatch: ' + frames_encoded); |
| |
| let base_layer_frames = frames_encoded / base_layer_decimator; |
| TEST.assert( |
| frames_decoded == base_layer_frames, |
| 'frames_decoded mismatch: ' + frames_decoded); |
| TEST.assert( |
| errors == 0, 'Decoding or encoding errors occurred during the test'); |
| } |
| </script> |
| </head> |
| |
| <body> |
| </body> |
| |
| </html> |
