avcodec: add ClearVideo decoder

Only I-frames are decoded for now.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -25,6 +25,7 @@ version <next>:
 - FM Screen Capture Codec decoder
 - native Opus encoder
 - ScreenPressor decoder
+- incomplete ClearVideo decoder
 
 version 3.2:
 - libopenmpt demuxer

doc/general.texi

@@ -342,6 +342,7 @@ library:
 @item iLBC                      @tab X @tab X
 @item Interplay MVE             @tab   @tab X
     @tab Format used in various Interplay computer games.
+@item Iterated Systems ClearVideo @tab     @tab  X
 @item IV8                       @tab   @tab X
     @tab A format generated by IndigoVision 8000 video server.
 @item IVF (On2)                 @tab X @tab X

libavcodec/Makefile

@@ -228,6 +228,7 @@ OBJS-$(CONFIG_CDXL_DECODER)            += cdxl.o
 OBJS-$(CONFIG_CFHD_DECODER)            += cfhd.o cfhddata.o
 OBJS-$(CONFIG_CINEPAK_DECODER)         += cinepak.o
 OBJS-$(CONFIG_CINEPAK_ENCODER)         += cinepakenc.o elbg.o
+OBJS-$(CONFIG_CLEARVIDEO_DECODER)      += clearvideo.o
 OBJS-$(CONFIG_CLJR_DECODER)            += cljrdec.o
 OBJS-$(CONFIG_CLJR_ENCODER)            += cljrenc.o
 OBJS-$(CONFIG_CLLC_DECODER)            += cllc.o canopus.o

libavcodec/allcodecs.c

@@ -157,6 +157,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(CDXL,              cdxl);
     REGISTER_DECODER(CFHD,              cfhd);
     REGISTER_ENCDEC (CINEPAK,           cinepak);
+    REGISTER_DECODER(CLEARVIDEO,        clearvideo);
     REGISTER_ENCDEC (CLJR,              cljr);
     REGISTER_DECODER(CLLC,              cllc);
     REGISTER_ENCDEC (COMFORTNOISE,      comfortnoise);

libavcodec/avcodec.h

@@ -416,6 +416,7 @@ enum AVCodecID {
     AV_CODEC_ID_SPEEDHQ,
     AV_CODEC_ID_FMVC,
     AV_CODEC_ID_SCPR,
+    AV_CODEC_ID_CLEARVIDEO,
 
     /* various PCM "codecs" */
     AV_CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs

libavcodec/codec_desc.c

@@ -1367,6 +1367,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("ScreenPressor"),
         .props     = AV_CODEC_PROP_LOSSLESS | AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_CLEARVIDEO,
+        .type      = AVMEDIA_TYPE_VIDEO,
+        .name      = "clearvideo",
+        .long_name = NULL_IF_CONFIG_SMALL("Iterated Systems ClearVideo"),
+        .props     = AV_CODEC_PROP_LOSSY,
+    },
 
     /* image codecs */
     {

libavcodec/version.h

@@ -28,8 +28,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  57
-#define LIBAVCODEC_VERSION_MINOR  81
-#define LIBAVCODEC_VERSION_MICRO 103
+#define LIBAVCODEC_VERSION_MINOR  82
+#define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \

libavformat/riff.c

@@ -450,6 +450,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { AV_CODEC_ID_SPEEDHQ,      MKTAG('S', 'H', 'Q', '9') },
     { AV_CODEC_ID_FMVC,         MKTAG('F', 'M', 'V', 'C') },
     { AV_CODEC_ID_SCPR,         MKTAG('S', 'C', 'P', 'R') },
+    { AV_CODEC_ID_CLEARVIDEO,   MKTAG('U', 'C', 'O', 'D') },
 
     { AV_CODEC_ID_NONE,         0 }
 };

libavformat/rm.c

@@ -43,5 +43,6 @@ const AVCodecTag ff_rm_codec_tags[] = {
     { AV_CODEC_ID_AAC,    MKTAG('r','a','a','c') },
     { AV_CODEC_ID_AAC,    MKTAG('r','a','c','p') },
     { AV_CODEC_ID_RALF,   MKTAG('L','S','D',':') },
+    { AV_CODEC_ID_CLEARVIDEO, MKTAG('C','L','V','1') },
     { AV_CODEC_ID_NONE },
 };