[xcode/daap/rsp] Default transcode to 320 kbps mp3 instead of wav

- Calculate size for both formats (+ move the return to transcode_encode_query)
- Let transcode_needed() decide what format to output
- Determine content-type from transcoding type
- Add transcode-dependent ability to override file metadata in rsp/daap
- Send file size matching format

src/outputs/airplay.c

@@ -1153,7 +1153,7 @@ master_session_make(struct media_quality *quality)
       goto error;
     }
 
-  rms->encode_ctx = transcode_encode_setup(XCODE_ALAC, quality, decode_ctx, NULL, 0, 0);
+  rms->encode_ctx = transcode_encode_setup(XCODE_ALAC, quality, decode_ctx, 0, 0);
   transcode_decode_cleanup(&decode_ctx);
   if (!rms->encode_ctx)
     {

src/outputs/cast.c

@@ -2399,7 +2399,7 @@ cast_init(void)
       goto out_tls_deinit;
     }
 
-  cast_encode_ctx = transcode_encode_setup(XCODE_OPUS, &cast_quality_default, decode_ctx, NULL, 0, 0);
+  cast_encode_ctx = transcode_encode_setup(XCODE_OPUS, &cast_quality_default, decode_ctx, 0, 0);
   transcode_decode_cleanup(&decode_ctx);
   if (!cast_encode_ctx)
     {

src/outputs/raop.c

@@ -1888,7 +1888,7 @@ master_session_make(struct media_quality *quality, bool encrypt)
       goto error;
     }
 
-  rms->encode_ctx = transcode_encode_setup(XCODE_ALAC, quality, decode_ctx, NULL, 0, 0);
+  rms->encode_ctx = transcode_encode_setup(XCODE_ALAC, quality, decode_ctx, 0, 0);
   transcode_decode_cleanup(&decode_ctx);
   if (!rms->encode_ctx)
     {

src/outputs/streaming.c

@@ -133,7 +133,7 @@ encoder_setup(enum player_format format, struct media_quality *quality)
     }
 
   if (format == PLAYER_FORMAT_MP3)
-    encode_ctx = transcode_encode_setup(XCODE_MP3, quality, decode_ctx, NULL, 0, 0);
+    encode_ctx = transcode_encode_setup(XCODE_MP3, quality, decode_ctx, 0, 0);
 
   if (!encode_ctx)
     {