add fetchStream

packages/artplayer-plugin-flv/src/flvParse/fetchStream.js

@@ -0,0 +1,46 @@
+import { errorHandle } from '../utils';
+
+export default function fetchStream(flv, url) {
+    flv.emit('flvFetchStart');
+    fetch(url).then(response => {
+        errorHandle(
+            response.ok && response.status >= 200 && response.status <= 299,
+            `${response.status} ${response.statusText}`,
+        );
+        const contentLength = response.headers.get('content-length');
+        const contentType = response.headers.get('content-type');
+        // errorHandle(contentLength, 'Content-Length response header unavailable');
+        errorHandle(contentType.includes('x-flv'), 'The resource does not seem to be a flv file');
+        flv.emit('flvFetchInfo', {
+            type: contentType,
+            length: contentLength,
+        });
+        return new Response(
+            new ReadableStream({
+                start(controller) {
+                    const reader = response.body.getReader();
+                    (function read() {
+                        reader
+                            .read()
+                            .then(({ done, value }) => {
+                                if (done) {
+                                    flv.emit('flvFetchEnd');
+                                    controller.close();
+                                    return;
+                                }
+                                flv.emit('flvFetching', value);
+                                controller.enqueue(value);
+                                read();
+                            })
+                            .catch(error => {
+                                flv.emit('flvFetchError', error);
+                            });
+                    })();
+                },
+                cancel() {
+                    flv.emit('flvFetchCancel');
+                },
+            }),
+        );
+    });
+}