feat: add getWrappedMimeType, update deps

README.md

@@ -70,7 +70,11 @@
       --mdat [audio data]
       ```
 
-## Methods
+## API
+
+### `MSEAudioWrapper`
+
+_Default export_
 
 `const wrapper = new MSEAudioWrapper("audio/mpeg", {minFramesPerSegment: 2, minBytesPerSegment: 576, preferredContainer: "webm"});`
 * `constructor`
@@ -133,6 +137,20 @@
     * OPUS (ISOBMFF) - `audio/mp4;codecs="opus"`
     * OPUS (WEBM) - `audio/webm;codecs="opus"`
     * Vorbis - `audio/webm;codecs="vorbis"`
+
+### `getWrappedMimeType(codec, container = WEBM)`
+
+_Named export_
+
+Returns the mime-type that MSEAudioWrapper will produce given a passed in codec and container type.
+
+* `codec` *required*
+  * Codec of the audio data to wrap
+  * Accepts `aac`, `flac`, `mpeg`, `opus`, `vorbis`
+* `container` *optional*
+  * Accepts `"webm"`, `"fmp4"`
+  * Defaults to `"webm"`
+
 ---
 
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mse-audio-wrapper",
-  "version": "1.4.14",
+  "version": "1.4.15",
   "description": "Library to enable Media Source Extensions API playback for unsupported audio containers and raw codecs",
   "main": "src/MSEAudioWrapper.js",
   "type": "module",
@@ -44,9 +44,9 @@
     "url": "https://github.com/sponsors/eshaz"
   },
   "dependencies": {
-    "codec-parser": "2.4.3"
+    "codec-parser": "2.5.0"
   },
   "devDependencies": {
-    "prettier": "^3.0.1"
+    "prettier": "^3.3.3"
   }
 }

src/MSEAudioWrapper.js

@@ -34,6 +34,23 @@ import WEBMContainer from "./containers/webm/WEBMContainer.js";
 
 const noOp = () => {};
 
+export const getWrappedMimeType = (codec, container = WEBM) => {
+  switch (codec) {
+    case "mpeg":
+      return `${AUDIO_MP4}"${MP3}"`;
+    case "aac":
+      return `${AUDIO_MP4}"${MP4A_40_2}"`;
+    case "flac":
+      return `${AUDIO_MP4}"${FLAC}"`;
+    case "vorbis":
+      return `${AUDIO_WEBM}"${VORBIS}"`;
+    case "opus":
+      return container === WEBM
+        ? `${AUDIO_WEBM}"${OPUS}"`
+        : `${AUDIO_MP4}"${OPUS}"`;
+  }
+};
+
 export default class MSEAudioWrapper {
   /**
    * @description Wraps audio data into media source API compatible containers
@@ -166,29 +183,23 @@ export default class MSEAudioWrapper {
    * @private
    */
   _getContainer(codec) {
+    this._mimeType = getWrappedMimeType(codec, this.PREFERRED_CONTAINER);
+
     switch (codec) {
       case "mpeg":
-        this._mimeType = `${AUDIO_MP4}"${MP3}"`;
         return new ISOBMFFContainer(MP3);
       case "aac":
-        this._mimeType = `${AUDIO_MP4}"${MP4A_40_2}"`;
         return new ISOBMFFContainer(MP4A_40_2);
       case "flac":
-        this._mimeType = `${AUDIO_MP4}"${FLAC}"`;
         return new ISOBMFFContainer(FLAC);
       case "vorbis":
-        this._mimeType = `${AUDIO_WEBM}"${VORBIS}"`;
-
         this.MAX_SAMPLES_PER_SEGMENT = 32767;
         return new WEBMContainer(VORBIS);
       case "opus":
         if (this.PREFERRED_CONTAINER === WEBM) {
-          this._mimeType = `${AUDIO_WEBM}"${OPUS}"`;
-
           this.MAX_SAMPLES_PER_SEGMENT = 32767;
           return new WEBMContainer(OPUS);
         }
-        this._mimeType = `${AUDIO_MP4}"${OPUS}"`;
         return new ISOBMFFContainer(OPUS);
     }
   }