| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script src="resources/compatibility.js"></script> |
| <script src="resources/audio-testing.js"></script> |
| <script src="resources/merger-testing.js"></script> |
| </head> |
| |
| <body> |
| <script> |
| description('Test input handling of ChannelMergerNode (non-default).'); |
| window.jsTestIsAsync = true; |
| |
| var audit = Audit.createTaskRunner(); |
| |
| |
| // Task: Check if an inactive input renders a silent mono channel in the |
| // output. |
| audit.defineTask('silent-channel', function (done) { |
| testMergerInput({ |
| numberOfChannels: 7, |
| |
| // Create a mono source buffer filled with '1'. |
| testBufferChannelCount: 1, |
| |
| // Connect the output of source into the 7th input of merger. |
| mergerInputIndex: 6, |
| |
| // 7th channel should be '1'. |
| expected: [0, 0, 0, 0, 0, 0, 1], |
| }, done); |
| }); |
| |
| |
| // Task: Check if a stereo input is being down-mixed to mono channel |
| // correctly based on the mixing rule. |
| audit.defineTask('stereo-down-mixing', function (done) { |
| testMergerInput({ |
| numberOfChannels: 7, |
| |
| // Create a stereo buffer filled with '1' and '2' for left and right |
| // channels respectively. |
| testBufferChannelCount: 2, |
| |
| // Connect the output of source into the 7th input of merger. |
| mergerInputIndex: 6, |
| |
| // The result of summed and down-mixed stereo audio should be 1.5. |
| // (= 1 * 0.5 + 2 * 0.5) |
| expected: [0, 0, 0, 0, 0, 0, 1.5], |
| }, done); |
| }); |
| |
| |
| // Task: Check if 3-channel input gets processed by the 'discrete' mixing |
| // rule. |
| audit.defineTask('undefined-channel-layout', function (done) { |
| testMergerInput({ |
| numberOfChannels: 7, |
| |
| // Create a 3-channel buffer filled with '1', '2', and '3' respectively. |
| testBufferChannelCount: 3, |
| |
| // Connect the output of source into the 7th input of merger. |
| mergerInputIndex: 6, |
| |
| // The result of summed stereo audio should be 1 because 3-channel is |
| // not a canonical layout, so the input channel 2 and 3 should be |
| // dropped by 'discrete' mixing rule. |
| expected: [0, 0, 0, 0, 0, 0, 1], |
| }, done); |
| }); |
| |
| audit.defineTask('finish', function (done) { |
| finishJSTest(); |
| done(); |
| }); |
| |
| audit.runTasks( |
| 'silent-channel', |
| 'stereo-down-mixing', |
| 'undefined-channel-layout', |
| 'finish' |
| ); |
| |
| successfullyParsed = true; |
| </script> |
| </body> |
| |
| </html> |
