hls errors if you pass audio only (#461)

Co-authored-by: pascalbaljet <pascal@pascalbaljet.nl>

Author: aronquiray

src/Exporters/HLSExporter.php

@@ -109,8 +109,12 @@ public function useSegmentFilenameGenerator(Closure $callback): self
     private function getSegmentFilenameGenerator(): callable
     {
         return $this->segmentFilenameGenerator ?: function ($name, $format, $key, $segments, $playlist) {
-            $segments("{$name}_{$key}_{$format->getKiloBitrate()}_%05d.ts");
-            $playlist("{$name}_{$key}_{$format->getKiloBitrate()}.m3u8");
+            $bitrate = $this->driver->getVideoStream()
+                ? $format->getKiloBitrate()
+                : $format->getAudioKiloBitrate();
+
+            $segments("{$name}_{$key}_{$bitrate}_%05d.ts");
+            $playlist("{$name}_{$key}_{$bitrate}.m3u8");
         };
     }
 

src/Exporters/HLSPlaylistGenerator.php

@@ -49,8 +49,10 @@ public function get(array $segmentPlaylists, PHPFFMpeg $driver): string
             $media = (new MediaOpener($segmentPlaylist->getDisk(), $driver))
                 ->openWithInputOptions($segmentPlaylist->getPath(), ['-allowed_extensions', 'ALL']);
 
-            if ($frameRate = StreamParser::new($media->getVideoStream())->getFrameRate()) {
-                $streamInfoLine .= ",FRAME-RATE={$frameRate}";
+            if ($media->getVideoStream()) {
+                if ($frameRate = StreamParser::new($media->getVideoStream())->getFrameRate()) {
+                    $streamInfoLine .= ",FRAME-RATE={$frameRate}";
+                }
             }
 
             return [$streamInfoLine, $segmentPlaylist->getFilename()];

tests/HlsExportTest.php

@@ -40,7 +40,7 @@ public function it_throws_an_exception_when_no_format_has_been_added()
     }
 
     /** @test */
-    public function it_can_export_a_single_media_file_into_a_hls_export()
+    public function it_can_export_a_single_video_file_into_a_hls_export()
     {
         $this->fakeLocalVideoFile();
 
@@ -86,6 +86,41 @@ public function it_can_export_a_single_media_file_into_a_hls_export()
         ]);
     }
 
+    /** @test */
+    public function it_can_export_a_single_audio_file_into_a_hls_export()
+    {
+        $this->fakeLocalAudioFile();
+
+        $lowBitrate  = $this->x264()->setAudioKiloBitrate(250);
+        $midBitrate  = $this->x264()->setAudioKiloBitrate(1000);
+        $highBitrate = $this->x264()->setAudioKiloBitrate(4000);
+
+        (new MediaOpener)
+            ->open('guitar.m4a')
+            ->exportForHLS()
+            ->addFormat($lowBitrate)
+            ->addFormat($midBitrate)
+            ->addFormat($highBitrate)
+            ->toDisk('local')
+            ->save('adaptive.m3u8');
+
+        $this->assertTrue(Storage::disk('local')->has('adaptive.m3u8'));
+        $this->assertTrue(Storage::disk('local')->has('adaptive_0_250.m3u8'));
+        $this->assertTrue(Storage::disk('local')->has('adaptive_1_1000.m3u8'));
+        $this->assertTrue(Storage::disk('local')->has('adaptive_2_4000.m3u8'));
+
+        $this->assertPlaylistPattern(Storage::disk('local')->get('adaptive.m3u8'), [
+            '#EXTM3U',
+            '#EXT-X-STREAM-INF:BANDWIDTH=275000,CODECS="mp4a.40.34"',
+            'adaptive_0_250.m3u8',
+            '#EXT-X-STREAM-INF:BANDWIDTH=1100000,CODECS="mp4a.40.34"',
+            'adaptive_1_1000.m3u8',
+            '#EXT-X-STREAM-INF:BANDWIDTH=4400000,CODECS="mp4a.40.34"',
+            'adaptive_2_4000.m3u8',
+            '#EXT-X-ENDLIST',
+        ]);
+    }
+
     /** @test */
     public function it_can_set_additional_parameters_on_the_format()
     {