First release

node_modules/mux.js/cjs/flv/flv-header.js

@@ -0,0 +1,62 @@
+/**
+ * mux.js
+ *
+ * Copyright (c) Brightcove
+ * Licensed Apache-2.0 https://github.com/videojs/mux.js/blob/master/LICENSE
+ */
+'use strict';
+
+var FlvTag = require('./flv-tag.js'); // For information on the FLV format, see
+// http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf.
+// Technically, this function returns the header and a metadata FLV tag
+// if duration is greater than zero
+// duration in seconds
+// @return {object} the bytes of the FLV header as a Uint8Array
+
+
+var getFlvHeader = function getFlvHeader(duration, audio, video) {
+  // :ByteArray {
+  var headBytes = new Uint8Array(3 + 1 + 1 + 4),
+      head = new DataView(headBytes.buffer),
+      metadata,
+      result,
+      metadataLength; // default arguments
+
+  duration = duration || 0;
+  audio = audio === undefined ? true : audio;
+  video = video === undefined ? true : video; // signature
+
+  head.setUint8(0, 0x46); // 'F'
+
+  head.setUint8(1, 0x4c); // 'L'
+
+  head.setUint8(2, 0x56); // 'V'
+  // version
+
+  head.setUint8(3, 0x01); // flags
+
+  head.setUint8(4, (audio ? 0x04 : 0x00) | (video ? 0x01 : 0x00)); // data offset, should be 9 for FLV v1
+
+  head.setUint32(5, headBytes.byteLength); // init the first FLV tag
+
+  if (duration <= 0) {
+    // no duration available so just write the first field of the first
+    // FLV tag
+    result = new Uint8Array(headBytes.byteLength + 4);
+    result.set(headBytes);
+    result.set([0, 0, 0, 0], headBytes.byteLength);
+    return result;
+  } // write out the duration metadata tag
+
+
+  metadata = new FlvTag(FlvTag.METADATA_TAG);
+  metadata.pts = metadata.dts = 0;
+  metadata.writeMetaDataDouble('duration', duration);
+  metadataLength = metadata.finalize().length;
+  result = new Uint8Array(headBytes.byteLength + metadataLength);
+  result.set(headBytes);
+  result.set(head.byteLength, metadataLength);
+  return result;
+};
+
+module.exports = getFlvHeader;