diff --git a/src/audio/player.c b/src/audio/player.c

index 67ca9521..01e54191 100644

--- a/src/audio/player.c

+++ b/src/audio/player.c

@@ -475,12 +475,11 @@ static iRangecc mediaType_(const iString *str) {

 return part;

}



-static iContentSpec contentSpec_Player_(const iPlayer *d) {

+static iContentSpec detectContentSpec_Player_(const iPlayer *d) {

 iContentSpec content;

 iZap(content);

 const size_t dataSize = size_InputBuf(d->data);

- iBuffer *buf = iClob(new_Buffer());

- open_Buffer(buf, &d->data->data);

+ iBuffer *buf = NULL;

 const iRangecc mediaType = mediaType_(&d->mime);

 if (equal_Rangecc(mediaType, "audio/wave") || equal_Rangecc(mediaType, "audio/wav") ||

     equal_Rangecc(mediaType, "audio/x-wav") || equal_Rangecc(mediaType, "audio/x-pn-wav")) {

@@ -499,6 +498,12 @@ static iContentSpec contentSpec_Player_(const iPlayer *d) {

     /* TODO: Could try decoders to see if one works? */

     content.type = none_DecoderType;

 }

+ if (content.type != none_DecoderType) {

+ buf = iClob(new_Buffer());

+ /* This holds a reference to the data block. The decoder runs in a background

+ thread so it needs its own copy of the data. */

+ open_Buffer(buf, &d->data->data);

+ }

 if (content.type == wav_DecoderType && dataSize >= 44) {

     /* Read the RIFF/WAVE header. */

     iStream *is = stream_Buffer(buf);

@@ -713,6 +718,8 @@ void updateSourceData_Player(iPlayer *d, const iString *mimeType, const iBlock *

             break;

         }

         /* The old parts cannot have changed. */

+ /* NOTE: The decoder will hold a reference to the data block, which means

+ appending here will cause a copy-on-write detach to occur. */

         appendData_Block(&input->data, constBegin_Block(data) + oldSize, newSize - oldSize);

         break;

     }

@@ -769,7 +776,7 @@ iBool start_Player(iPlayer *d) {

     return iTrue;

 }

#endif

- iContentSpec content = contentSpec_Player_(d);

+ iContentSpec content = detectContentSpec_Player_(d);

 if (!content.output.freq) {

     return iFalse;

 }