avfilter: add streamselect and astreamselect filter

Signed-off-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -64,6 +64,7 @@ version <next>:
 - new DCA decoder with full support for DTS-HD extensions
 - significant performance improvements in Windows Television (WTV) demuxer
 - nnedi deinterlacer
+- streamselect video and astreamselect audio filter
 
 
 version 2.8:

doc/filters.texi

@@ -11321,6 +11321,45 @@ stereo3d=abl:sbsr
 @end example
 @end itemize
 
+@section streamselect, astreamselect
+Select video or audio streams.
+
+The filter accepts the following options:
+
+@table @option
+@item inputs
+Set number of inputs. Default is 2.
+
+@item map
+Set input indexes to remap to outputs.
+@end table
+
+@subsection Commands
+
+The @code{streamselect} and @code{astreamselect} filter supports the following
+commands:
+
+@table @option
+@item map
+Set input indexes to remap to outputs.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Select first 5 seconds 1st stream and rest of time 2nd stream:
+@example
+sendcmd='5.0 streamselect map 1',streamselect=inputs=2:map=0
+@end example
+
+@item
+Same as above, but for audio:
+@example
+asendcmd='5.0 astreamselect map 1',astreamselect=inputs=2:map=0
+@end example
+@end itemize
+
 @anchor{spp}
 @section spp
 

libavfilter/Makefile

@@ -57,6 +57,7 @@ OBJS-$(CONFIG_ASETTB_FILTER)                 += settb.o
 OBJS-$(CONFIG_ASHOWINFO_FILTER)              += af_ashowinfo.o
 OBJS-$(CONFIG_ASPLIT_FILTER)                 += split.o
 OBJS-$(CONFIG_ASTATS_FILTER)                 += af_astats.o
+OBJS-$(CONFIG_ASTREAMSELECT_FILTER)          += f_streamselect.o
 OBJS-$(CONFIG_ASYNCTS_FILTER)                += af_asyncts.o
 OBJS-$(CONFIG_ATEMPO_FILTER)                 += af_atempo.o
 OBJS-$(CONFIG_ATRIM_FILTER)                  += trim.o
@@ -237,6 +238,7 @@ OBJS-$(CONFIG_SPLIT_FILTER)                  += split.o
 OBJS-$(CONFIG_SPP_FILTER)                    += vf_spp.o
 OBJS-$(CONFIG_SSIM_FILTER)                   += vf_ssim.o dualinput.o framesync.o
 OBJS-$(CONFIG_STEREO3D_FILTER)               += vf_stereo3d.o
+OBJS-$(CONFIG_STREAMSELECT_FILTER)           += f_streamselect.o
 OBJS-$(CONFIG_SUBTITLES_FILTER)              += vf_subtitles.o
 OBJS-$(CONFIG_SUPER2XSAI_FILTER)             += vf_super2xsai.o
 OBJS-$(CONFIG_SWAPUV_FILTER)                 += vf_swapuv.o

libavfilter/allfilters.c

@@ -78,6 +78,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(ASHOWINFO,      ashowinfo,      af);
     REGISTER_FILTER(ASPLIT,         asplit,         af);
     REGISTER_FILTER(ASTATS,         astats,         af);
+    REGISTER_FILTER(ASTREAMSELECT,  astreamselect,  af);
     REGISTER_FILTER(ASYNCTS,        asyncts,        af);
     REGISTER_FILTER(ATEMPO,         atempo,         af);
     REGISTER_FILTER(ATRIM,          atrim,          af);
@@ -257,6 +258,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(SPP,            spp,            vf);
     REGISTER_FILTER(SSIM,           ssim,           vf);
     REGISTER_FILTER(STEREO3D,       stereo3d,       vf);
+    REGISTER_FILTER(STREAMSELECT,   streamselect,   vf);
     REGISTER_FILTER(SUBTITLES,      subtitles,      vf);
     REGISTER_FILTER(SUPER2XSAI,     super2xsai,     vf);
     REGISTER_FILTER(SWAPUV,         swapuv,         vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  28
+#define LIBAVFILTER_VERSION_MINOR  29
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \