| <!DOCTYPE html> |
| <html> |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script type="text/javascript" src="resources/audio-testing.js"></script> |
| <script src="resources/audio-file-utils.js"></script> |
| <body> |
| <script> |
| description("Test that decoding an WAV isn't incorrectly receiving silence at the end"); |
| |
| window.jsTestIsAsync = true; |
| |
| var context = new window.AudioContext({ sampleRate: 44100 }); |
| var request = new XMLHttpRequest(); |
| request.open("GET", 'pinknoise.wav', true); |
| request.responseType = "arraybuffer"; |
| |
| request.onload = function() { |
| context.decodeAudioData(request.response, (buffer) => { |
| testPassed("Successfully decoded content"); |
| // File is exactly 4s @ 44100Hz |
| if (buffer.length === 176400) |
| testPassed("Decoding returned the right number of frames."); |
| else { |
| testFailed("Decoding returned the wrong number of frames: " + buffer.length); |
| finishJSTest(); |
| return; |
| } |
| // convert to 32 bits float WAV. |
| const wavData = createAudioData(buffer, true /* asFloat */); |
| context.decodeAudioData(wavData.buffer, (buffer) => { |
| if (buffer.length === 176400) |
| testPassed("Decoding returned the right number of frames."); |
| else { |
| testFailed("Decoding returned the wrong number of frames: " + buffer.length); |
| finishJSTest(); |
| return; |
| } |
| const decodedData = buffer.getChannelData(0); |
| let consecutiveSilent = 0 |
| for (const sample of decodedData) { |
| if (sample == 0 && ++consecutiveSilent > 3) { |
| testFailed("Found silence content."); |
| break; |
| } else if (sample) |
| consecutiveSilent = 0 |
| } |
| if (!consecutiveSilent) |
| testPassed("All frames got decoded with no silence."); |
| finishJSTest(); |
| }, () => { |
| testFailed("Failed to decode intermediary file"); |
| finishJSTest(); |
| }); |
| }, () => { |
| testFailed("Failed to decode file"); |
| finishJSTest(); |
| }); |
| } |
| request.send(); |
| |
| </script> |
| </body> |
| </html> |
