First release

node_modules/mux.js/es/tools/parse-trun.js

@@ -0,0 +1,99 @@
+var parseSampleFlags = require('./parse-sample-flags.js');
+
+var trun = function trun(data) {
+  var result = {
+    version: data[0],
+    flags: new Uint8Array(data.subarray(1, 4)),
+    samples: []
+  },
+      view = new DataView(data.buffer, data.byteOffset, data.byteLength),
+      // Flag interpretation
+  dataOffsetPresent = result.flags[2] & 0x01,
+      // compare with 2nd byte of 0x1
+  firstSampleFlagsPresent = result.flags[2] & 0x04,
+      // compare with 2nd byte of 0x4
+  sampleDurationPresent = result.flags[1] & 0x01,
+      // compare with 2nd byte of 0x100
+  sampleSizePresent = result.flags[1] & 0x02,
+      // compare with 2nd byte of 0x200
+  sampleFlagsPresent = result.flags[1] & 0x04,
+      // compare with 2nd byte of 0x400
+  sampleCompositionTimeOffsetPresent = result.flags[1] & 0x08,
+      // compare with 2nd byte of 0x800
+  sampleCount = view.getUint32(4),
+      offset = 8,
+      sample;
+
+  if (dataOffsetPresent) {
+    // 32 bit signed integer
+    result.dataOffset = view.getInt32(offset);
+    offset += 4;
+  } // Overrides the flags for the first sample only. The order of
+  // optional values will be: duration, size, compositionTimeOffset
+
+
+  if (firstSampleFlagsPresent && sampleCount) {
+    sample = {
+      flags: parseSampleFlags(data.subarray(offset, offset + 4))
+    };
+    offset += 4;
+
+    if (sampleDurationPresent) {
+      sample.duration = view.getUint32(offset);
+      offset += 4;
+    }
+
+    if (sampleSizePresent) {
+      sample.size = view.getUint32(offset);
+      offset += 4;
+    }
+
+    if (sampleCompositionTimeOffsetPresent) {
+      if (result.version === 1) {
+        sample.compositionTimeOffset = view.getInt32(offset);
+      } else {
+        sample.compositionTimeOffset = view.getUint32(offset);
+      }
+
+      offset += 4;
+    }
+
+    result.samples.push(sample);
+    sampleCount--;
+  }
+
+  while (sampleCount--) {
+    sample = {};
+
+    if (sampleDurationPresent) {
+      sample.duration = view.getUint32(offset);
+      offset += 4;
+    }
+
+    if (sampleSizePresent) {
+      sample.size = view.getUint32(offset);
+      offset += 4;
+    }
+
+    if (sampleFlagsPresent) {
+      sample.flags = parseSampleFlags(data.subarray(offset, offset + 4));
+      offset += 4;
+    }
+
+    if (sampleCompositionTimeOffsetPresent) {
+      if (result.version === 1) {
+        sample.compositionTimeOffset = view.getInt32(offset);
+      } else {
+        sample.compositionTimeOffset = view.getUint32(offset);
+      }
+
+      offset += 4;
+    }
+
+    result.samples.push(sample);
+  }
+
+  return result;
+};
+
+module.exports = trun;