145 lines
4.6 KiB
C
Executable File
145 lines
4.6 KiB
C
Executable File
/* (C) 2007-2008 Jean-Marc Valin, CSIRO
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef RATE_H
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#define RATE_H
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#define MAX_PULSES 128
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#define LOG_MAX_PULSES 7
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#define BITRES 4
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#define BITROUND 8
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#define BITOVERFLOW 30000
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#include "cwrs.h"
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static __inline int bits2pulses(const CELTMode *m, const celt_int16_t *cache, int N, int bits)
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{
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int i;
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int lo, hi;
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lo = 0;
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hi = MAX_PULSES-1;
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#if 0 /* Disabled until we can make that useful */
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/* Use of more than MAX_PULSES is disabled until we are able to cwrs that decently */
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if (bits > cache[MAX_PULSES-1] && N<=4)
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{
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/*int pulses;
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pulses = 127;
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while (16 + log2_frac(2*(pulses+1)*(pulses+1) + 1, 4) <= bits && pulses < 32767)
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pulses++;*/
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lo = 127;
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switch (N)
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{
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case 3:
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hi = 1024;
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for (i=0;i<10;i++)
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{
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int pulses = (lo+hi)>>1;
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if (log2_frac(((UMUL16_16(pulses,pulses)>>1)+1)>>1, 4) > bits)
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hi = pulses;
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else
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lo = pulses;
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}
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break;
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case 4:
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hi = 1024;
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for (i=0;i<10;i++)
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{
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int pulses = (lo+hi)>>1;
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if (log2_frac((UMUL32(UMUL16_16(pulses,pulses)+2,pulses))/3<<3, 4) > bits)
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hi = pulses;
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else
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lo = pulses;
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}
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break;
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}
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return lo;
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}
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#endif
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/* Instead of using the "bisection condition" we use a fixed number of
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iterations because it should be faster */
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/*while (hi-lo != 1)*/
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for (i=0;i<LOG_MAX_PULSES;i++)
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{
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int mid = (lo+hi)>>1;
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/* OPT: Make sure this is implemented with a conditional move */
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if (cache[mid] >= bits)
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hi = mid;
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else
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lo = mid;
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}
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if (bits-cache[lo] <= cache[hi]-bits)
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return lo;
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else
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return hi;
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}
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static __inline int pulses2bits(const celt_int16_t *cache, int N, int pulses)
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{
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#if 0 /* Use of more than MAX_PULSES is disabled until we are able to cwrs that decently */
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if (pulses > 127)
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{
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int bits;
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switch (N)
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{
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case 3:
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bits = log2_frac(((UMUL16_16(pulses,pulses)>>1)+1)>>1, 4);
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break;
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case 4:
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bits = log2_frac((UMUL32(UMUL16_16(pulses,pulses)+2,pulses))/3<<3, 4);
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break;
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}
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/*printf ("%d <- %d\n", bits, pulses);*/
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return bits;
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}
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#endif
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return cache[pulses];
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}
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/** Computes a cache of the pulses->bits mapping in each band */
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celt_int16_t **compute_alloc_cache(CELTMode *m, int C);
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/** Compute the pulse allocation, i.e. how many pulses will go in each
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* band.
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@param m mode
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@param offsets Requested increase or decrease in the number of bits for
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each band
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@param total Number of bands
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@param pulses Number of pulses per band (returned)
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@return Total number of bits allocated
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*/
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void compute_allocation(const CELTMode *m, int *offsets, int total, int *pulses, int *ebits, int *fine_priority);
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#endif
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