[Ffmpeg-devel] [PATCH] libavutil - splitting parts from libavcodec
Alexander Strasser
eclipse7
Mon Jul 25 22:40:30 CEST 2005
Hi Michael,
> On Sunday 24 July 2005 11:36, Alexander Strasser wrote:
> > Alexander Strasser wrote:
> > > i moved some of the generic utility code of libavcodec
> > > to a lib of its own: libavutil.
> > >
> > > The idea is to have the generally useful stuff in an
> > > independent directory/library for making it conviniently
> > > usable from other projects. It IMHO also improves FFmpeg
> > > project's internal structure/layout.
> > >
> > > I did no functional changes to the code. I did only
> > > code moving, buildsystem changes and exporting of
> > > functions through avutil.h .
> >
> > I was unnecessary incompatible because of a misconception
> > i had about the dynamic linkage of libavformat.
> >
> > Also removed a cosmetical change that slipped through.
> >
> > Corrected patch attached.
>
> av_reduce() seems to disapear
sorry, i forgot to add the diffs of the changes i made to
the moved files
> av_rescale* are quite generic functions too, so they should be moved into
> libavutil
done. i also renamed the math.c file to mathematics.c and created
a header for it named mathematics.h .
> ff_sqrt_tab and ff_reverse are used by common.h so they must be moved or the
> functions which use them must be moved away from common.h
I added ff_sqrt_tab. But i couldn't find a reference to ff_reverse.
I think bitstream.h exports it in libavcodec.
> and please remove all the version & build defines from libavutil unless they
> are needed for something (didnt notice anything) these can be added later
> when we decided what to do with the libavcodec/format versioning
Ok, they are not yet needed. I removed them. But despite that
i left the FFMPEG_VERSION* #defines in avutil.h .
They seem to be common to all av libs. And as libavutil is meant
to be independent from the others but the other two depend on it,
this common information should be in libavutil.
I mean if it gets changed it is already in the right place and
libavutil will need some indentification stuff too at some point.
Please correct me if I am wrong.
> then grep for libavcodec in the files in libavutil, there are a few in the
> Makefile at least which shouldnt be there
ah yes, very good catch. corrected.
> [...]
Updated patch and changed files attached.
Alex (beastd)
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#
# libavutil Makefile
#
include ../config.mak
VPATH=$(SRC_PATH)/libavutil
# NOTE: -I.. is needed to include config.h
CFLAGS=$(OPTFLAGS) -DHAVE_AV_CONFIG_H -I.. -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
OBJS= mathematics.o \
integer.o \
rational.o \
intfloat_readwrite.o \
ifeq ($(TARGET_ARCH_SPARC64),yes)
CFLAGS+= -mcpu=ultrasparc -mtune=ultrasparc
endif
SRCS := $(OBJS:.o=.c)
LIB= $(LIBPREF)avutil$(LIBSUF)
ifeq ($(BUILD_SHARED),yes)
SLIB= $(SLIBPREF)avutil$(SLIBSUF)
endif
all: $(LIB) $(SLIB)
$(LIB): $(OBJS)
rm -f $@
$(AR) rc $@ $(OBJS)
$(RANLIB) $@
$(SLIB): $(OBJS)
ifeq ($(CONFIG_WIN32),yes)
$(CC) $(SHFLAGS) -Wl,--output-def,$(@:.dll=.def) -o $@ $(OBJS) $(EXTRALIBS) $(AMREXTRALIBS)
-lib /machine:i386 /def:$(@:.dll=.def)
else
$(CC) $(SHFLAGS) -o $@ $(OBJS) $(EXTRALIBS) $(AMREXTRALIBS) $(LDFLAGS)
endif
%.o: %.c
$(CC) $(CFLAGS) $(LIBOBJFLAGS) -c -o $@ $<
depend: $(SRCS)
$(CC) -MM $(CFLAGS) $^ 1>.depend
dep: depend
clean:
rm -f *.o *.d *~ .depend $(LIB) $(SLIB) *.so
distclean: clean
rm -f Makefile.bak .depend
ifeq ($(BUILD_SHARED),yes)
install: all install-headers
ifeq ($(CONFIG_WIN32),yes)
install $(INSTALLSTRIP) -m 755 $(SLIB) "$(prefix)"
else
install -d $(libdir)
install $(INSTALLSTRIP) -m 755 $(SLIB) $(libdir)/libavutil-$(VERSION).so
ln -sf libavutil-$(VERSION).so $(libdir)/libavutil.so
$(LDCONFIG) || true
endif
else
install:
endif
installlib: all install-headers
install -m 644 $(LIB) "$(libdir)"
install-headers:
mkdir -p "$(prefix)/include/ffmpeg"
install -m 644 $(SRC_PATH)/libavutil/avutil.h \
$(SRC_PATH)/libavutil/common.h \
$(SRC_PATH)/libavutil/mathematics.h \
$(SRC_PATH)/libavutil/integer.h \
$(SRC_PATH)/libavutil/rational.h \
$(SRC_PATH)/libavutil/intfloat_readwrite.h \
"$(prefix)/include/ffmpeg"
# install -d $(libdir)/pkgconfig
# install -m 644 ../libavutil.pc $(libdir)/pkgconfig
#
# include dependency files if they exist
#
ifneq ($(wildcard .depend),)
include .depend
endif
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Index: Makefile
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/Makefile,v
retrieving revision 1.81
diff -u -r1.81 Makefile
--- Makefile 8 May 2005 15:04:59 -0000 1.81
+++ Makefile 25 Jul 2005 20:10:52 -0000
@@ -6,7 +6,7 @@
VPATH=$(SRC_PATH)
-CFLAGS=$(OPTFLAGS) -I. -I$(SRC_PATH) -I$(SRC_PATH)/libavcodec -I$(SRC_PATH)/libavformat -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
+CFLAGS=$(OPTFLAGS) -I. -I$(SRC_PATH) -I$(SRC_PATH)/libavutil -I$(SRC_PATH)/libavcodec -I$(SRC_PATH)/libavformat -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
LDFLAGS+= -g
ifeq ($(TARGET_GPROF),yes)
@@ -91,11 +91,12 @@
OBJS = ffmpeg.o ffserver.o cmdutils.o $(FFPLAY_O)
SRCS = $(OBJS:.o=.c) $(ASM_OBJS:.o=.s)
-FFLIBS = -L./libavformat -lavformat$(BUILDSUF) -L./libavcodec -lavcodec$(BUILDSUF)
+FFLIBS = -L./libavformat -lavformat$(BUILDSUF) -L./libavcodec -lavcodec$(BUILDSUF) -L./libavutil -lavutil$(BUILDSUF)
all: lib $(PROG) $(PROGTEST) $(VHOOK) $(QTFASTSTART) $(DOC)
lib:
+ $(MAKE) -C libavutil all
$(MAKE) -C libavcodec all
$(MAKE) -C libavformat all
@@ -162,6 +163,7 @@
$(MAKE) -C vhook install
installlib:
+ $(MAKE) -C libavutil installlib
$(MAKE) -C libavcodec installlib
$(MAKE) -C libavformat installlib
@@ -182,6 +184,7 @@
@for i in $(DEP_LIBS) ; do if $(TEST) $$i -nt .libs ; then touch .libs; fi ; done
clean: $(CLEANVHOOK)
+ $(MAKE) -C libavutil clean
$(MAKE) -C libavcodec clean
$(MAKE) -C libavformat clean
$(MAKE) -C tests clean
Index: libavcodec/Makefile
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavcodec/Makefile,v
retrieving revision 1.196
diff -u -r1.196 Makefile
--- libavcodec/Makefile 17 Jul 2005 00:28:11 -0000 1.196
+++ libavcodec/Makefile 25 Jul 2005 20:10:52 -0000
@@ -7,7 +7,7 @@
VPATH=$(SRC_PATH)/libavcodec
# NOTE: -I.. is needed to include config.h
-CFLAGS=$(OPTFLAGS) -DHAVE_AV_CONFIG_H -I.. -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE $(AMR_CFLAGS)
+CFLAGS=$(OPTFLAGS) -DHAVE_AV_CONFIG_H -I.. -I$(SRC_PATH)/libavutil -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE $(AMR_CFLAGS)
OBJS= bitstream.o utils.o mem.o allcodecs.o \
mpegvideo.o jrevdct.o jfdctfst.o jfdctint.o\
@@ -16,8 +16,8 @@
mpeg12.o mpegaudiodec.o pcm.o simple_idct.o \
ratecontrol.o adpcm.o eval.o error_resilience.o \
fft.o mdct.o raw.o golomb.o cabac.o\
- dpcm.o adx.o rational.o faandct.o parser.o g726.o \
- vp3dsp.o integer.o h264idct.o rangecoder.o pnm.o h263.o msmpeg4.o h263dec.o dvdsub.o dvbsub.o dvbsubdec.o
+ dpcm.o adx.o faandct.o parser.o g726.o \
+ vp3dsp.o h264idct.o rangecoder.o pnm.o h263.o msmpeg4.o h263dec.o dvdsub.o dvbsub.o dvbsubdec.o
ifeq ($(CONFIG_AASC_DECODER),yes)
OBJS+= aasc.o
@@ -234,6 +234,8 @@
endif
endif
+EXTRALIBS += -L$(SRC_PATH)/libavutil -lavutil$(BUILDSUF)
+
# currently using libdts for dts decoding
ifeq ($(CONFIG_DTS),yes)
OBJS+= dtsdec.o
@@ -375,6 +377,7 @@
OBJS := $(OBJS) $(ASM_OBJS)
LIB= $(LIBPREF)avcodec$(LIBSUF)
+LIBAVUTIL= $(SRC_PATH)/libavutil/$(LIBPREF)avutil$(LIBSUF)
ifeq ($(BUILD_SHARED),yes)
SLIB= $(SLIBPREF)avcodec$(SLIBSUF)
endif
@@ -446,7 +449,7 @@
# api example program
apiexample: apiexample.c $(LIB)
- $(CC) $(CFLAGS) -o $@ $< $(LIB) $(EXTRALIBS) -lm
+ $(CC) $(CFLAGS) -o $@ $< $(LIB) $(LIBAVUTIL) $(EXTRALIBS) -lm
# cpuid test
cpuid_test: i386/cputest.c
@@ -464,7 +467,7 @@
$(CC) -o $@ $^ -lm
fft-test: fft-test.o $(LIB)
- $(CC) -o $@ $^ -lm
+ $(CC) -o $@ $^ $(LIBAVUTIL) -lm
ifeq ($(BUILD_SHARED),yes)
install: all install-headers
@@ -489,8 +492,6 @@
install-headers:
mkdir -p "$(prefix)/include/ffmpeg"
install -m 644 $(SRC_PATH)/libavcodec/avcodec.h \
- $(SRC_PATH)/libavcodec/common.h \
- $(SRC_PATH)/libavcodec/rational.h \
"$(prefix)/include/ffmpeg"
install -d $(libdir)/pkgconfig
install -m 644 ../libavcodec.pc $(libdir)/pkgconfig
Index: libavcodec/avcodec.h
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavcodec/avcodec.h,v
retrieving revision 1.410
diff -u -r1.410 avcodec.h
--- libavcodec/avcodec.h 19 Jul 2005 14:25:23 -0000 1.410
+++ libavcodec/avcodec.h 25 Jul 2005 20:10:53 -0000
@@ -11,12 +11,9 @@
extern "C" {
#endif
-#include "common.h"
-#include "rational.h"
+#include "avutil.h"
#include <sys/types.h> /* size_t */
-#define FFMPEG_VERSION_INT 0x000409
-#define FFMPEG_VERSION "CVS"
#define LIBAVCODEC_BUILD 4759
@@ -278,14 +275,6 @@
ME_X1
};
-enum AVRounding {
- AV_ROUND_ZERO = 0, ///< round toward zero
- AV_ROUND_INF = 1, ///< round away from zero
- AV_ROUND_DOWN = 2, ///< round toward -infinity
- AV_ROUND_UP = 3, ///< round toward +infinity
- AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
-};
-
enum AVDiscard{
//we leave some space between them for extensions (drop some keyframes for intra only or drop just some bidir frames)
AVDISCARD_NONE =-16, ///< discard nothing
@@ -2307,36 +2296,6 @@
*/
char av_get_pict_type_char(int pict_type);
-/**
- * reduce a fraction.
- * this is usefull for framerate calculations
- * @param max the maximum allowed for dst_nom & dst_den
- * @return 1 if exact, 0 otherwise
- */
-int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max);
-
-/**
- * rescale a 64bit integer with rounding to nearest.
- * a simple a*b/c isn't possible as it can overflow
- */
-int64_t av_rescale(int64_t a, int64_t b, int64_t c);
-
-/**
- * rescale a 64bit integer with specified rounding.
- * a simple a*b/c isn't possible as it can overflow
- */
-int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding);
-
-/**
- * rescale a 64bit integer by 2 rational numbers.
- */
-int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq);
-
-double av_int2dbl(int64_t v);
-float av_int2flt(int32_t v);
-int64_t av_dbl2int(double d);
-int32_t av_flt2int(float d);
-
/* frame parsing */
typedef struct AVCodecParserContext {
Index: libavcodec/utils.c
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavcodec/utils.c,v
retrieving revision 1.145
diff -u -r1.145 utils.c
--- libavcodec/utils.c 19 Jul 2005 13:29:13 -0000 1.145
+++ libavcodec/utils.c 25 Jul 2005 20:10:54 -0000
@@ -31,24 +31,6 @@
#include <stdarg.h>
#include <limits.h>
-const uint8_t ff_sqrt_tab[128]={
- 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5,
- 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
- 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
- 9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11
-};
-
-const uint8_t ff_log2_tab[256]={
- 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
- 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
- 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
- 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
-};
-
const uint8_t ff_reverse[256]={
0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
@@ -919,107 +901,6 @@
}
}
-int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
- AVRational a0={0,1}, a1={1,0};
- int sign= (nom<0) ^ (den<0);
- int64_t gcd= ff_gcd(ABS(nom), ABS(den));
-
- nom = ABS(nom)/gcd;
- den = ABS(den)/gcd;
- if(nom<=max && den<=max){
- a1= (AVRational){nom, den};
- den=0;
- }
-
- while(den){
- int64_t x = nom / den;
- int64_t next_den= nom - den*x;
- int64_t a2n= x*a1.num + a0.num;
- int64_t a2d= x*a1.den + a0.den;
-
- if(a2n > max || a2d > max) break;
-
- a0= a1;
- a1= (AVRational){a2n, a2d};
- nom= den;
- den= next_den;
- }
- assert(ff_gcd(a1.num, a1.den) == 1);
-
- *dst_nom = sign ? -a1.num : a1.num;
- *dst_den = a1.den;
-
- return den==0;
-}
-
-int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
- AVInteger ai;
- int64_t r=0;
- assert(c > 0);
- assert(b >=0);
- assert(rnd >=0 && rnd<=5 && rnd!=4);
-
- if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
-
- if(rnd==AV_ROUND_NEAR_INF) r= c/2;
- else if(rnd&1) r= c-1;
-
- if(b<=INT_MAX && c<=INT_MAX){
- if(a<=INT_MAX)
- return (a * b + r)/c;
- else
- return a/c*b + (a%c*b + r)/c;
- }
-
- ai= av_mul_i(av_int2i(a), av_int2i(b));
- ai= av_add_i(ai, av_int2i(r));
-
- return av_i2int(av_div_i(ai, av_int2i(c)));
-}
-
-int64_t av_rescale(int64_t a, int64_t b, int64_t c){
- return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
-}
-
-int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq){
- int64_t b= bq.num * (int64_t)cq.den;
- int64_t c= cq.num * (int64_t)bq.den;
- return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
-}
-
-int64_t ff_gcd(int64_t a, int64_t b){
- if(b) return ff_gcd(b, a%b);
- else return a;
-}
-
-double av_int2dbl(int64_t v){
- if(v+v > 0xFFELLU<<52)
- return 0.0/0.0;
- return ldexp(((v&(1LL<<52)-1) + (1LL<<52)) * (v>>63|1), (v>>52&0x7FF)-1075);
-}
-
-float av_int2flt(int32_t v){
- if(v+v > 0xFF000000U)
- return 0.0/0.0;
- return ldexp(((v&0x7FFFFF) + (1<<23)) * (v>>31|1), (v>>23&0xFF)-150);
-}
-
-int64_t av_dbl2int(double d){
- int e;
- if ( !d) return 0;
- else if(d-d) return 0x7FF0000000000000LL + ((int64_t)(d<0)<<63) + (d!=d);
- d= frexp(d, &e);
- return (int64_t)(d<0)<<63 | (e+1022LL)<<52 | (int64_t)((fabs(d)-0.5)*(1LL<<53));
-}
-
-int32_t av_flt2int(float d){
- int e;
- if ( !d) return 0;
- else if(d-d) return 0x7F800000 + ((d<0)<<31) + (d!=d);
- d= frexp(d, &e);
- return (d<0)<<31 | (e+126)<<23 | (int64_t)((fabs(d)-0.5)*(1<<24));
-}
-
/* av_log API */
static int av_log_level = AV_LOG_INFO;
Index: libavcodec/i386/fdct_mmx.c
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavcodec/i386/fdct_mmx.c,v
retrieving revision 1.16
diff -u -r1.16 fdct_mmx.c
--- libavcodec/i386/fdct_mmx.c 11 Oct 2004 02:19:29 -0000 1.16
+++ libavcodec/i386/fdct_mmx.c 25 Jul 2005 20:10:54 -0000
@@ -13,7 +13,7 @@
* a page about fdct at http://www.geocities.com/ssavekar/dct.htm
* Skal's fdct at http://skal.planet-d.net/coding/dct.html
*/
-#include "../common.h"
+#include "common.h"
#include "../dsputil.h"
#include "mmx.h"
Index: libavcodec/i386/idct_mmx.c
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavcodec/i386/idct_mmx.c,v
retrieving revision 1.12
diff -u -r1.12 idct_mmx.c
--- libavcodec/i386/idct_mmx.c 2 Jun 2005 20:45:35 -0000 1.12
+++ libavcodec/i386/idct_mmx.c 25 Jul 2005 20:10:55 -0000
@@ -22,7 +22,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#include "../common.h"
+#include "common.h"
#include "../dsputil.h"
#include "mmx.h"
Index: libavformat/Makefile
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/libavformat/Makefile,v
retrieving revision 1.95
diff -u -r1.95 Makefile
--- libavformat/Makefile 15 Jul 2005 12:50:00 -0000 1.95
+++ libavformat/Makefile 25 Jul 2005 20:10:55 -0000
@@ -6,7 +6,7 @@
VPATH=$(SRC_PATH)/libavformat
-CFLAGS=$(OPTFLAGS) -I.. -I$(SRC_PATH) -I$(SRC_PATH)/libavcodec -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
+CFLAGS=$(OPTFLAGS) -I.. -I$(SRC_PATH) -I$(SRC_PATH)/libavutil -I$(SRC_PATH)/libavcodec -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
OBJS= utils.o cutils.o os_support.o allformats.o
PPOBJS=
Index: vhook/Makefile
===================================================================
RCS file: /cvsroot/ffmpeg/ffmpeg/vhook/Makefile,v
retrieving revision 1.21
diff -u -r1.21 Makefile
--- vhook/Makefile 11 Jul 2005 00:15:37 -0000 1.21
+++ vhook/Makefile 25 Jul 2005 20:10:55 -0000
@@ -2,7 +2,7 @@
VPATH=$(SRC_PATH)/vhook
-CFLAGS=-fPIC $(SHCFLAGS) -I.. -I$(SRC_PATH) -I$(SRC_PATH)/libavformat -I$(SRC_PATH)/libavcodec -DHAVE_AV_CONFIG_H
+CFLAGS=-fPIC $(SHCFLAGS) -I.. -I$(SRC_PATH) -I$(SRC_PATH)/libavformat -I$(SRC_PATH)/libavcodec -I$(SRC_PATH)/libavutil -DHAVE_AV_CONFIG_H
ifeq ($(CONFIG_DARWIN),yes)
SHFLAGS+=-flat_namespace -undefined suppress
--- ../ffmpeg-clean/libavcodec/rational.h 2004-07-15 16:06:39.000000000 +0200
+++ libavutil/rational.h 2005-07-22 13:18:53.000000000 +0200
@@ -52,6 +52,14 @@
return a.num / (double) a.den;
}
+/**
+ * reduce a fraction.
+ * this is usefull for framerate calculations
+ * @param max the maximum allowed for dst_nom & dst_den
+ * @return 1 if exact, 0 otherwise
+ */
+int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max);
+
AVRational av_mul_q(AVRational b, AVRational c);
AVRational av_div_q(AVRational b, AVRational c);
AVRational av_add_q(AVRational b, AVRational c);
--- ../ffmpeg-clean/libavcodec/rational.c 2004-07-15 16:06:39.000000000 +0200
+++ libavutil/rational.c 2005-07-25 21:09:26.000000000 +0200
@@ -28,9 +28,42 @@
#include <limits.h>
#include "common.h"
-#include "avcodec.h"
+#include "mathematics.h"
#include "rational.h"
+int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
+ AVRational a0={0,1}, a1={1,0};
+ int sign= (nom<0) ^ (den<0);
+ int64_t gcd= ff_gcd(ABS(nom), ABS(den));
+
+ nom = ABS(nom)/gcd;
+ den = ABS(den)/gcd;
+ if(nom<=max && den<=max){
+ a1= (AVRational){nom, den};
+ den=0;
+ }
+
+ while(den){
+ int64_t x = nom / den;
+ int64_t next_den= nom - den*x;
+ int64_t a2n= x*a1.num + a0.num;
+ int64_t a2d= x*a1.den + a0.den;
+
+ if(a2n > max || a2d > max) break;
+
+ a0= a1;
+ a1= (AVRational){a2n, a2d};
+ nom= den;
+ den= next_den;
+ }
+ assert(ff_gcd(a1.num, a1.den) == 1);
+
+ *dst_nom = sign ? -a1.num : a1.num;
+ *dst_den = a1.den;
+
+ return den==0;
+}
+
/**
* returns b*c.
*/
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