[SDK] One step further towards ReactOS source code tree restructure: the sdk folder...

[reactos.git] / reactos / lib / 3rdparty / libmpg123 / ntom.c

diff --git a/reactos/lib/3rdparty/libmpg123/ntom.c b/reactos/lib/3rdparty/libmpg123/ntom.c
deleted file mode 100644 (file)
index 196a569..0000000
--- a/reactos/lib/3rdparty/libmpg123/ntom.c
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
-       ntom.c: N->M down/up sampling; the setup code.
-
-       copyright 1995-2008 by the mpg123 project - free software under the terms of the LGPL 2.1
-       see COPYING and AUTHORS files in distribution or http://mpg123.org
-       initially written by Michael Hipp
-*/
-
-#define SAFE_NTOM /* Do not depend on off_t*off_t with big values still being in the range... */
-#include "mpg123lib_intern.h"
-#include "debug.h"
-
-int synth_ntom_set_step(mpg123_handle *fr)
-{
-       long m,n;
-       m = frame_freq(fr);
-       n = fr->af.rate;
-       if(VERBOSE2)
-               fprintf(stderr,"Init rate converter: %ld->%ld\n",m,n);
-
-       if(n > NTOM_MAX_FREQ || m > NTOM_MAX_FREQ || m <= 0 || n <= 0) {
-               if(NOQUIET) error("NtoM converter: illegal rates");
-               fr->err = MPG123_BAD_RATE;
-               return -1;
-       }
-
-       n *= NTOM_MUL;
-       fr->ntom_step = (unsigned long) n / m;
-
-       if(fr->ntom_step > (unsigned long)NTOM_MAX*NTOM_MUL) {
-               if(NOQUIET) error3("max. 1:%i conversion allowed (%lu vs %lu)!", NTOM_MAX, fr->ntom_step, (unsigned long)8*NTOM_MUL);
-               fr->err = MPG123_BAD_RATE;
-               return -1;
-       }
-
-       fr->ntom_val[0] = fr->ntom_val[1] = ntom_val(fr, fr->num);
-       return 0;
-}
-
-/*
-       The SAFE_NTOM does iterative loops instead of straight multiplication.
-       The safety is not just about the algorithm closely mimicking the decoder instead of applying some formula,
-       it is more about avoiding multiplication of possibly big sample offsets (a 32bit off_t could overflow too easily).
-*/
-
-unsigned long ntom_val(mpg123_handle *fr, off_t frame)
-{
-       off_t ntm;
-#ifdef SAFE_NTOM /* Carry out the loop, without the threatening integer overflow. */
-       off_t f;
-       ntm = NTOM_MUL>>1; /* for frame 0 */
-       for(f=0; f<frame; ++f)   /* for frame > 0 */
-       {
-               ntm += fr->spf*fr->ntom_step;
-               ntm -= (ntm/NTOM_MUL)*NTOM_MUL;
-       }
-#else /* Just make one computation with overall sample offset. */
-       ntm  = (NTOM_MUL>>1) + fr->spf*frame*fr->ntom_step;
-       ntm -= (ntm/NTOM_MUL)*NTOM_MUL;
-#endif
-       return (unsigned long) ntm;
-}
-
-/* Set the ntom value for next expected frame to be decoded.
-   This is for keeping output consistent across seeks. */
-void ntom_set_ntom(mpg123_handle *fr, off_t num)
-{
-       fr->ntom_val[1] = fr->ntom_val[0] = ntom_val(fr, num);
-}
-
-/* Carry out the ntom sample count operation for this one frame. 
-   No fear of integer overflow here. */
-off_t ntom_frame_outsamples(mpg123_handle *fr)
-{
-       /* The do this before decoding the separate channels, so there is only one common ntom value. */
-       int ntm = fr->ntom_val[0];
-       ntm += fr->spf*fr->ntom_step;
-       return ntm/NTOM_MUL;
-}
-
-/* Convert frame offset to unadjusted output sample offset. */
-off_t ntom_frmouts(mpg123_handle *fr, off_t frame)
-{
-#ifdef SAFE_NTOM
-       off_t f;
-#endif
-       off_t soff = 0;
-       off_t ntm = ntom_val(fr,0);
-#ifdef SAFE_NTOM
-       if(frame <= 0) return 0;
-       for(f=0; f<frame; ++f)
-       {
-               ntm  += fr->spf*fr->ntom_step;
-               soff += ntm/NTOM_MUL;
-               ntm  -= (ntm/NTOM_MUL)*NTOM_MUL;
-       }
-#else
-       soff = (ntm + frame*(off_t)fr->spf*(off_t)fr->ntom_step)/(off_t)NTOM_MUL;
-#endif
-       return soff;
-}
-
-/* Convert input samples to unadjusted output samples. */
-off_t ntom_ins2outs(mpg123_handle *fr, off_t ins)
-{
-       off_t soff = 0;
-       off_t ntm = ntom_val(fr,0);
-#ifdef SAFE_NTOM
-       {
-               off_t block = fr->spf;
-               if(ins <= 0) return 0;
-               do
-               {
-                       off_t nowblock = ins > block ? block : ins;
-                       ntm  += nowblock*fr->ntom_step;
-                       soff += ntm/NTOM_MUL;
-                       ntm  -= (ntm/NTOM_MUL)*NTOM_MUL;
-                       ins -= nowblock;
-               } while(ins > 0);
-       }
-#else
-       /* Beware of overflows: when off_t is 32bits, the multiplication blows too easily.
-          Of course, it blows for 64bits, too, in theory, but that's for _really_ large files. */
-       soff = ((off_t)ntm + (off_t)ins*(off_t)fr->ntom_step)/(off_t)NTOM_MUL;
-#endif
-       return soff;
-}
-
-/* Determine frame offset from unadjusted output sample offset. */
-off_t ntom_frameoff(mpg123_handle *fr, off_t soff)
-{
-       off_t ioff = 0; /* frames or samples */
-       off_t ntm = ntom_val(fr,0);
-#ifdef SAFE_NTOM
-       if(soff <= 0) return 0;
-       for(ioff=0; 1; ++ioff)
-       {
-               ntm  += fr->spf*fr->ntom_step;
-               if(ntm/NTOM_MUL > soff) break;
-               soff -= ntm/NTOM_MUL;
-               ntm  -= (ntm/NTOM_MUL)*NTOM_MUL;
-       }
-       return ioff;
-#else
-       ioff = (soff*(off_t)NTOM_MUL-ntm)/(off_t)fr->ntom_step;
-       return ioff/(off_t)fr->spf;
-#endif
-}