pcm_bluray: rename pcm-mpeg.c to pcm-bluray.c

The original idea was to collect PCM codecs that could appear in various
MPEG streams in this file. Discussion in IRC lead to the conclusion that
one codec per file would be better and stop the need for #ifdefs.

libavcodec/Makefile

@@ -426,7 +426,7 @@ OBJS-$(CONFIG_ZMBV_ENCODER)            += zmbvenc.o
 # (AD)PCM decoders/encoders
 OBJS-$(CONFIG_PCM_ALAW_DECODER)           += pcm.o
 OBJS-$(CONFIG_PCM_ALAW_ENCODER)           += pcm.o
-OBJS-$(CONFIG_PCM_BLURAY_DECODER)         += pcm-mpeg.o
+OBJS-$(CONFIG_PCM_BLURAY_DECODER)         += pcm-bluray.o
 OBJS-$(CONFIG_PCM_DVD_DECODER)            += pcm.o
 OBJS-$(CONFIG_PCM_F32BE_DECODER)          += pcm.o
 OBJS-$(CONFIG_PCM_F32BE_ENCODER)          += pcm.o

libavcodec/pcm-bluray.c

@@ -1,5 +1,5 @@
 /*
- * LPCM codecs for PCM formats found in MPEG streams
+ * LPCM codecs for PCM format found in Blu-ray PCM streams
  * Copyright (c) 2009, 2013 Christian Schmidt
  *
  * This file is part of Libav.
@@ -21,7 +21,7 @@
 
 /**
  * @file
- * PCM codecs for encodings found in MPEG streams (DVD/Blu-ray)
+ * PCM codec for Blu-ray PCM audio tracks
  */
 
 #include "libavutil/channel_layout.h"