ivfdec: webm reader support

This patch enables ivfdec to decode WebM files. WebM demuxing is
provided by the Matthew Gregan's Nestegg library.

This patch also makes minor changes to the timebase->framerate
handling when doing Y4M output. For WebM files, the framerate is
guessed by looking at the first second of video. For IVF files,
the timebase=1/(2*fps) hack is still in place, but is only used
if the timebase denominator is less than 1000. This is in anticipation
of change I8d25b5b, which introduces the distinction between
framerate and timebase to ivfenc. In the case of high resolution
timebases, like 100ns, we would have to guess the framerate
like we do for WebM, but since WebM support in ivfenc will
deprecate IVF output, we just assume 30fps rather than writing the
lookahead code.

Change-Id: I1dd8600f13bf6071533d2816f005da9ede4f60a2

1 files changed, 7 insertions, 0 deletions

diff --git a/examples.mk b/examples.mk
index 00ffc7037..56da642ae 100644
--- a/examples.mk
+++ b/examples.mk
@@ -17,6 +17,13 @@ ivfdec.SRCS                 += md5_utils.c md5_utils.h
 ivfdec.SRCS                 += vpx_ports/vpx_timer.h
 ivfdec.SRCS                 += vpx/vpx_integer.h
 ivfdec.SRCS                 += args.c args.h vpx_ports/config.h
+ivfdec.SRCS                 += nestegg/halloc/halloc.h
+ivfdec.SRCS                 += nestegg/halloc/src/align.h
+ivfdec.SRCS                 += nestegg/halloc/src/halloc.c
+ivfdec.SRCS                 += nestegg/halloc/src/hlist.h
+ivfdec.SRCS                 += nestegg/halloc/src/macros.h
+ivfdec.SRCS                 += nestegg/include/nestegg/nestegg.h
+ivfdec.SRCS                 += nestegg/src/nestegg.c
 ivfdec.GUID                  = BA5FE66F-38DD-E034-F542-B1578C5FB950
 ivfdec.DESCRIPTION           = Full featured decoder
 UTILS-$(CONFIG_ENCODERS)    += ivfenc.c