lavc: rename h265 to hevc, add AV_CODEC_ID_H265 with identical value for backward compatibility

Somehow 2 different identifiers have come into existence which makes supporting
both until the next major version bump required
I did not investigate how exactly that did happen.

wm4, j-b and smarter prefer hevc.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/avcodec.h

@@ -302,7 +302,8 @@ enum AVCodecID {
     AV_CODEC_ID_SNOW       = MKBETAG('S','N','O','W'),
     AV_CODEC_ID_WEBP       = MKBETAG('W','E','B','P'),
     AV_CODEC_ID_SMVJPEG    = MKBETAG('S','M','V','J'),
-    AV_CODEC_ID_H265       = MKBETAG('H','2','6','5'),
+    AV_CODEC_ID_HEVC       = MKBETAG('H','2','6','5'),
+#define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
 
     /* various PCM "codecs" */
     AV_CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs

libavcodec/codec_desc.c

@@ -226,9 +226,9 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .props     = AV_CODEC_PROP_LOSSY | AV_CODEC_PROP_LOSSLESS,
     },
     {
-        .id        = AV_CODEC_ID_H265,
+        .id        = AV_CODEC_ID_HEVC,
         .type      = AVMEDIA_TYPE_VIDEO,
-        .name      = "h265",
+        .name      = "hevc",
         .long_name = NULL_IF_CONFIG_SMALL("H.265 / HEVC"),
         .props     = AV_CODEC_PROP_LOSSY | AV_CODEC_PROP_LOSSLESS,
     },

libavformat/h265dec.c

@@ -57,4 +57,4 @@ static int h265_probe(AVProbeData *p)
     return 0;
 }
 
-FF_DEF_RAWVIDEO_DEMUXER(h265 , "raw H.265 video", h265_probe, "h265,265,hevc", AV_CODEC_ID_H265)
+FF_DEF_RAWVIDEO_DEMUXER(h265 , "raw H.265 video", h265_probe, "h265,265,hevc", AV_CODEC_ID_HEVC)