| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>media-source-timestampoffset-trim</title> |
| <script src="media-source-loader.js"></script> |
| <script src="../video-test.js"></script> |
| <script> |
| var loader; |
| var source; |
| var sourceBuffer; |
| |
| const framesInAACPacket = 1024; |
| const sampleRate = 48000; |
| const totalFramesInSegment = 47; |
| const framesToBeDroppedBeginning = 5; |
| const framesToBeDroppedEnd = 5; |
| |
| function resetSourceBuffer() { |
| run('sourceBuffer.timestampOffset = 0'); |
| run('sourceBuffer.appendWindowStart = 0'); |
| run('sourceBuffer.appendWindowEnd = Infinity'); |
| } |
| |
| function runTest() { |
| findMediaElement(); |
| |
| loader = new MediaSourceLoader('content/test-48khz-manifest.json'); |
| loader.onerror = () => { |
| failTest('Media data loading failed'); |
| }; |
| loader.onload = async () => { |
| waitForEventAndFail('error'); |
| |
| source = new MediaSource(); |
| run('video.src = URL.createObjectURL(source)'); |
| await waitFor(source, 'sourceopen'); |
| |
| run('sourceBuffer = source.addSourceBuffer(loader.type())'); |
| run('sourceBuffer.appendBuffer(loader.initSegment())'); |
| await waitFor(sourceBuffer, 'update'); |
| |
| // We want the first framesToBeDroppedBeginning frames to be dropped, and only those. |
| run('sourceBuffer.timestampOffset = -(framesToBeDroppedBeginning * framesInAACPacket) / sampleRate'); |
| consoleWrite('Append a media segment negative offset.') |
| run('sourceBuffer.appendBuffer(loader.mediaSegment(0))'); |
| await waitFor(sourceBuffer, 'update'); |
| |
| testExpected('sourceBuffer.buffered.length', 1); |
| testExpected('sourceBuffer.buffered.start(0)', 0); |
| testExpected('sourceBuffer.buffered.end(0)' , ((totalFramesInSegment - framesToBeDroppedBeginning) * framesInAACPacket) / sampleRate); |
| run('sourceBuffer.remove(0, Infinity)'); |
| await waitFor(sourceBuffer, 'update'); |
| |
| resetSourceBuffer(); |
| // We want the first framesToBeDroppedBeginning frames to be dropped, and only those. |
| run('sourceBuffer.appendWindowStart = (framesToBeDroppedBeginning * framesInAACPacket) / sampleRate'); |
| consoleWrite('Append a media segment with appendWindowStart set.') |
| run('sourceBuffer.appendBuffer(loader.mediaSegment(0))'); |
| await waitFor(sourceBuffer, 'update'); |
| |
| testExpected('sourceBuffer.buffered.length', 1); |
| testExpected('sourceBuffer.buffered.start(0)', (framesToBeDroppedBeginning * framesInAACPacket) / sampleRate); |
| testExpected('sourceBuffer.buffered.end(0)' , (totalFramesInSegment * framesInAACPacket) / sampleRate); |
| run('sourceBuffer.remove(0, Infinity)'); |
| await waitFor(sourceBuffer, 'update'); |
| |
| resetSourceBuffer(); |
| // We want the last framesToBeDroppedEnd frames to be dropped, and only those. |
| run('sourceBuffer.appendWindowEnd = ((totalFramesInSegment - framesToBeDroppedEnd) * framesInAACPacket) / sampleRate'); |
| consoleWrite('Append a media segment with appendWindowEnd set.') |
| run('sourceBuffer.appendBuffer(loader.mediaSegment(0))'); |
| await waitFor(sourceBuffer, 'update'); |
| |
| testExpected('sourceBuffer.buffered.length', 1); |
| testExpected('sourceBuffer.buffered.start(0)', 0); |
| testExpected('sourceBuffer.buffered.end(0)' , ((totalFramesInSegment - framesToBeDroppedEnd) * framesInAACPacket) / sampleRate); |
| |
| endTest(); |
| }; |
| } |
| </script> |
| </head> |
| <body onload="runTest()"> |
| <div> |
| This tests that audio samples outside the appendWindow's interval are properly ignored. |
| </div> |
| <video controls></video> |
| </body> |
| </html> |
