🚧 Add stream to map

Still need to handle the codecs. But almost there.

src/Map.php

@@ -4,11 +4,12 @@ namespace Danjones\FFMpeg;
 
 class Map
 {
+    use Traits\HasMetadata;
+
     protected MappableMedia $media;
     protected string $path;
     /** @var Stream[] */
     protected array $streams = [];
-    protected array $metadata = [];
 
     public function __construct(MappableMedia $media)
     {
@@ -29,15 +30,22 @@ class Map
         return $this;
     }
 
-    public function addMetadata(array|string $keyOrData, string $value = null): static
+    public function stream(callable $callback = null): Stream|static
     {
-        if (is_array($keyOrData)) {
-            array_walk($keyOrData, fn($v, $k) => $this->addMetadata($k, $v));
-
-            return $this;
+        $stream = new Stream($this);
+        if (!$callback) {
+            return $stream;
         }
 
-        $this->metadata[$keyOrData] = $value;
+        $callback($stream);
+        $this->saveStream($stream);
+
+        return $this;
+    }
+
+    public function saveStream(Stream $stream): static
+    {
+        $this->streams[] = $stream;
 
         return $this;
     }

src/MappableMedia.php

@@ -149,7 +149,7 @@ class MappableMedia extends AbstractMediaType
         return $this;
     }
 
-    public function saveMap($map): static
+    public function saveMap(Map $map): static
     {
         $this->maps[] = $map;
 

src/Stream.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace Danjones\FFMpeg;
+
+use FFMpeg\Format\FormatInterface;
+
+class Stream
+{
+    use Traits\HasMetadata;
+
+    protected Map $map;
+    protected FormatInterface $codec;
+    protected string $input = '0:0';
+    protected array $flags = [];
+
+    public function __construct(Map $map)
+    {
+        $this->map = $map;
+    }
+
+    public function setInput(string $input): static
+    {
+        $this->input = $input;
+
+        return $this;
+    }
+
+    public function addFlag(string $key, string $value): static
+    {
+        $this->flags[$key] = $value;
+
+        return $this;
+    }
+
+    public function setCodec(FormatInterface $codec): static
+    {
+        $this->codec = $codec;
+
+        return $this;
+    }
+
+    protected function parseCodec(): static
+    {
+        // @todo
+        $this->addFlag('c', 'libx265');
+
+        return $this;
+    }
+
+    public function saveStream(): Map
+    {
+        $this->map->saveStream($this);
+
+        return $this->map;
+    }
+
+    public function buildCommand(int $idx = 0): array
+    {
+        $this->parseCodec();
+
+        $commands = [];
+
+        $commands[] = '-map';
+        $commands[] = $this->input;
+
+        foreach ($this->flags as $k => $v) {
+            array_push($commands, "-{$k}:{$idx}", $v);
+        }
+
+        foreach ($this->metadata as $k => $v) {
+            array_push($commands, "-metadata:s:{$idx}", "{$k}={$v}");
+        }
+
+        return $commands;
+    }
+}

src/Traits/HasMetadata.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Danjones\FFMpeg\Traits;
+
+trait HasMetadata
+{
+    protected array $metadata = [];
+
+    public function addMetadata(array|string $keyOrData, string $value = null): static
+    {
+        if (is_array($keyOrData)) {
+            array_walk($keyOrData, fn($v, $k) => $this->addMetadata($k, $v));
+
+            return $this;
+        }
+
+        $this->metadata[$keyOrData] = $value;
+
+        return $this;
+    }
+}