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[io] sink_apple_audio uses software-based encoding on ios

--- a/src/io/sink_apple_audio.c

+++ b/src/io/sink_apple_audio.c

@@ -238,6 +238,20 @@

     goto beach;

   }

+#if defined(kAppleSoftwareAudioCodecManufacturer)

+  // on iOS, set software based encoding before setting clientDataFormat

+  UInt32 codecManf = kAppleSoftwareAudioCodecManufacturer;

+  err = ExtAudioFileSetProperty(s->audioFile,

+      kExtAudioFileProperty_CodecManufacturer,

+      sizeof(UInt32), &codecManf);

+  if (err) {

+    char_t errorstr[20];

+    AUBIO_ERR("sink_apple_audio: error when trying to set sofware codec on %s "

+        "(%s)\n", s->path, getPrintableOSStatusError(errorstr, err));

+    goto beach;

+  }

+#endif

+

   err = ExtAudioFileSetProperty(s->audioFile,

       kExtAudioFileProperty_ClientDataFormat,

       sizeof(AudioStreamBasicDescription), &inputFormat);