fix(player): show audio codec and bitrate in the performance overlay on ExoPlayer

The Android performance overlay showed only sample rate and channels for
EAC3, FLAC, DTS, TrueHD, and Opus tracks. The overlay reads the codec
from media3's Format.codecs, an RFC 6381 string only MP4/HLS provide
(hence AAC working), and the bitrate from Format.bitrate, which Matroska
carries only when the muxer wrote BPS statistics tags.

Fall back to the already-transmitted sample MIME type for the codec name
(audio and video), and measure the audio bitrate in the FFmpeg demuxer
from packet sizes over their pts span — the same source mpv uses for its
audio-bitrate property — when the container declares none.

close #2063

lib/utils/codec_utils.dart

@@ -123,11 +123,29 @@ class CodecUtils {
 
   /// Formats an audio codec name to a user-friendly display format.
   ///
-  /// Accepts both ffmpeg-style names as reported by mpv and the media
-  /// servers ('aac', 'eac3') and RFC 6381 codec IDs as reported by
-  /// ExoPlayer's `Format.codecs` ('mp4a.40.2', 'ec-3', 'dtsc').
+  /// Accepts ffmpeg-style names as reported by mpv and the media
+  /// servers ('aac', 'eac3'), RFC 6381 codec IDs as reported by
+  /// ExoPlayer's `Format.codecs` ('mp4a.40.2', 'ec-3', 'dtsc'), and
+  /// `audio/...` MIME types as reported by ExoPlayer's
+  /// `Format.sampleMimeType` ('audio/eac3', 'audio/vnd.dts').
   static String formatAudioCodec(String codec) {
     final lower = codec.toLowerCase();
+    if (lower.startsWith('audio/')) {
+      return switch (lower.substring('audio/'.length)) {
+        'mp4a-latm' => 'AAC',
+        'mpeg' || 'mpeg-l2' => 'MP3',
+        'true-hd' => 'TrueHD',
+        'vnd.dts' => 'DTS',
+        'vnd.dts.hd' || 'vnd.dts.hd;profile=lbr' => 'DTS-HD',
+        'vnd.dts.uhd;audio=p2' => 'DTS:X',
+        'ac3' => 'AC3',
+        'eac3' || 'eac3-joc' => 'E-AC3',
+        'ac4' => 'AC4',
+        'raw' || 'wav' => 'PCM',
+        'alac' => 'ALAC',
+        final rest => formatAudioCodec(rest),
+      };
+    }
     // MP4 object types 0x69/0x6B under the mp4a prefix are MPEG layer
     // audio; every other mp4a object type in the wild is an AAC variant.
     if (lower == 'mp4a.69' || lower == 'mp4a.6b') return 'MP3';