build: Move MP2 muxer declaration away from MP3 muxer code

The MP2 muxer uses none of the code of the MP3 muxer.

libavcodec/Makefile

@@ -649,7 +649,6 @@ OBJS-$(CONFIG_MATROSKA_AUDIO_MUXER)    += mpeg4audio.o                  \
                                           flac.o flacdata.o
 OBJS-$(CONFIG_MATROSKA_MUXER)          += flac.o flacdata.o
 OBJS-$(CONFIG_MOV_DEMUXER)             += ac3tab.o
-OBJS-$(CONFIG_MP2_MUXER)               += mpegaudiodata.o mpegaudiodecheader.o
 OBJS-$(CONFIG_MP3_MUXER)               += mpegaudiodata.o mpegaudiodecheader.o
 OBJS-$(CONFIG_MPEGTS_MUXER)            += mpeg4audio.o
 OBJS-$(CONFIG_NUT_MUXER)               += mpegaudiodata.o

libavformat/Makefile

@@ -196,7 +196,7 @@ OBJS-$(CONFIG_MMF_MUXER)                 += mmf.o
 OBJS-$(CONFIG_MOV_DEMUXER)               += mov.o mov_chan.o replaygain.o
 OBJS-$(CONFIG_MOV_MUXER)                 += movenc.o avc.o hevc.o \
                                             movenchint.o mov_chan.o
-OBJS-$(CONFIG_MP2_MUXER)                 += mp3enc.o rawenc.o id3v2enc.o
+OBJS-$(CONFIG_MP2_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_MP3_DEMUXER)               += mp3dec.o replaygain.o
 OBJS-$(CONFIG_MP3_MUXER)                 += mp3enc.o rawenc.o id3v2enc.o
 OBJS-$(CONFIG_MPC_DEMUXER)               += mpc.o apetag.o img2.o

libavformat/mp3enc.c

@@ -432,21 +432,6 @@ static int mp3_write_trailer(struct AVFormatContext *s)
     return 0;
 }
 
-#if CONFIG_MP2_MUXER
-AVOutputFormat ff_mp2_muxer = {
-    .name              = "mp2",
-    .long_name         = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
-    .mime_type         = "audio/mpeg",
-    .extensions        = "mp2,m2a,mpa",
-    .audio_codec       = AV_CODEC_ID_MP2,
-    .video_codec       = AV_CODEC_ID_NONE,
-    .write_packet      = ff_raw_write_packet,
-    .flags             = AVFMT_NOTIMESTAMPS,
-};
-#endif
-
-#if CONFIG_MP3_MUXER
-
 static const AVOption options[] = {
     { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
       offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM},
@@ -589,4 +574,3 @@ AVOutputFormat ff_mp3_muxer = {
     .flags             = AVFMT_NOTIMESTAMPS,
     .priv_class        = &mp3_muxer_class,
 };
-#endif

libavformat/rawenc.c

@@ -231,6 +231,19 @@ AVOutputFormat ff_mlp_muxer = {
 };
 #endif
 
+#if CONFIG_MP2_MUXER
+AVOutputFormat ff_mp2_muxer = {
+    .name              = "mp2",
+    .long_name         = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
+    .mime_type         = "audio/mpeg",
+    .extensions        = "mp2,m2a,mpa",
+    .audio_codec       = AV_CODEC_ID_MP2,
+    .video_codec       = AV_CODEC_ID_NONE,
+    .write_packet      = ff_raw_write_packet,
+    .flags             = AVFMT_NOTIMESTAMPS,
+};
+#endif
+
 #if CONFIG_MPEG1VIDEO_MUXER
 AVOutputFormat ff_mpeg1video_muxer = {
     .name              = "mpeg1video",