Commit 56fbebdc authored by Monty's avatar Monty
Browse files

Put root level of Tremor in CVS


git-svn-id: https://svn.xiph.org/trunk/Tremor@3890 0101bb08-14d6-0310-b084-bc0e0c8e3800
parents
*** 20020517: 1.0.2 ***
Playback bugfix to floor1; mode mistakenly used for sizing instead
of blockflag
*** 20020515: 1.0.1 ***
Added complete API documentation to source tarball. No code
changes.
*** 20020412: 1.0.1 ***
Fixed a clipping bug that affected ARM processors; negative
overflows were being properly clipped, but then clobbered to
positive by the positive overflow chec (asm_arm.h:CLIP_TO_15)
*** 20020403: 1.0.0 ***
Initial version
\ No newline at end of file
AUTOMAKE_OPTIONS = foreign
INCLUDES = -I./
lib_LTLIBRARIES = libvorbisidec.la
libvorbisidec_la_SOURCES = mdct.c block.c window.c \
synthesis.c info.c \
floor1.c floor0.c vorbisfile.c \
res012.c mapping0.c registry.c codebook.c \
sharedbook.c framing.c bitwise.c \
codebook.h misc.h mdct_lookup.h\
os.h mdct.h ivorbisfile.h lsp_lookup.h\
registry.h window.h lookup_data.h\
codec_internal.h backends.h ogg.h \
asm_arm.h ivorbiscodec.h
libvorbisidec_la_LDFLAGS = -version-info @V_LIB_CURRENT@:@V_LIB_REVISION@:@V_LIB_AGE@
EXTRA_PROGRAMS = ivorbisfile_example
CLEANFILES = $(EXTRA_PROGRAMS) $(lib_LTLIBRARIES)
ivorbisfile_example_SOURCES = ivorbisfile_example.c
ivorbisfile_example_LDFLAGS = -static
ivorbisfile_example_LDADD = libvorbisidec.la
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# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:
This README covers the Ogg Vorbis 'Tremor' integer playback codec
source as of date 2002 04 03, version 1.0.0.
****
IMPORTANT: Unlike most commonly available Xiph.Org source code, this
package is Commercial software! It is neither BSD licensed nor a
variant of the GPL. As such, Xiph.Org reserves redistribution
rights, subject to agreed upon licensing terms.
******
The C source in this package will build on any ANSI C compiler and
function completely and properly on any platform. The included build
system assumes GNU build system and make tools (m4, automake,
autoconf, libtool and gmake). GCC is not required, although GCC is
the most tested compiler. To build using GNU tools, type in the
source directory:
./autogen.sh
make
Currently, the source implements playback in pure C on all platforms
except ARM, where a [currently] small amount of assembly (see
asm_arm.h) is used to implement 64 bit math operations and fast LSP
computation. If building on ARM without the benefit of GNU build
system tools, be sure that '_ARM_ASSEM_' is #defined by the build
system if this assembly is desired, else the resulting library will
use whatever 64 bit math builtins the compiler implements.
No math library is required by this source. No floating point
operations are used at any point in either setup or decode. This
decoder library will properly decode any past, current or future
Vorbis I file or stream.
********
The build system produces a static and [when supported by the OS]
dynamic library named 'libvorbisidec'. This library exposes an API
nearly identical to the BSD reference library's 'libvorbisfile',
including all the features familiar to users of vorbisfile. This API
is similar enough that the proper header file to include is named
'ivorbisfile.h' [included in the source build directory]. Lower level
libvorbis-style headers and structures are in 'ivorbiscodec.h'
[included in the source build directory]. A simple example program,
ivorbisfile_example.c, can be built with 'make ivorbisfile_example'.
[More documentation to come]
Monty
xiph.org
/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
* *
* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
* ALL REDISTRIBUTION RIGHTS RESERVED. *
* *
********************************************************************
function: arm7 and later wide math functions
********************************************************************/
#ifdef _ARM_ASSEM_
#ifndef _V_WIDE_MATH
#define _V_WIDE_MATH
static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) {
int lo,hi;
asm volatile("smull %0,%1,%2,%3;\n"
: "=&r"(lo),"=&r"(hi)
: "%r"(x),"r"(y));
return(hi);
}
static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
return MULT32(x,y)<<1;
}
static inline ogg_int32_t MULT30(ogg_int32_t x, ogg_int32_t y) {
return MULT32(x,y)<<2;
}
static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
int lo,hi;
asm volatile("smull %0,%1,%2,%3;\n"
"mov %0,%0, lsr #15;\n"
"orr %1,%0,%1, lsl #17;\n"
: "=&r"(lo),"=&r"(hi)
: "%r"(x),"r"(y));
return(hi);
}
static inline ogg_int32_t CLIP_TO_15(ogg_int32_t x) {
asm volatile("subs r0,%0,#32768;\n"
"movpl %0,#0x7f00;\n"
"orrpl %0,%0,#0xff;\n"
"adds r0,%0,#32768;\n"
"movmi %0,#0x8000;\n"
: "+r"(x)
:
: "r0","cc");
return(x);
}
#endif
#ifndef _V_LSP_MATH_ASM
#define _V_LSP_MATH_ASM
static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip,
ogg_int32_t *qexpp,
ogg_int32_t *ilsp,ogg_int32_t wi,
ogg_int32_t m){
ogg_uint32_t qi=*qip,pi=*pip;
ogg_int32_t qexp=*qexpp;
asm("mov r0,%3;"
"mov r1,%5,asr#1;"
"add r0,r0,r1,lsl#3;"
"1:"
"ldmdb r0!,{r1,r3};"
"subs r1,r1,%4;" //ilsp[j]-wi
"rsbmi r1,r1,#0;" //labs(ilsp[j]-wi)
"umull %0,r2,r1,%0;" //qi*=labs(ilsp[j]-wi)
"subs r1,r3,%4;" //ilsp[j+1]-wi
"rsbmi r1,r1,#0;" //labs(ilsp[j+1]-wi)
"umull %1,r3,r1,%1;" //pi*=labs(ilsp[j+1]-wi)
"cmn r2,r3;" // shift down 16?
"beq 0f;"
"add %2,%2,#16;"
"mov %0,%0,lsr #16;"
"orr %0,%0,r2,lsl #16;"
"mov %1,%1,lsr #16;"
"orr %1,%1,r3,lsl #16;"
"0:"
"cmp r0,%3;\n"
"bhi 1b;\n"
// odd filter assymetry
"ands r0,%5,#1;\n"
"beq 2f;\n"
"add r0,%3,%5,lsl#2;\n"
"ldr r1,[r0,#-4];\n"