1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007,2008,2009 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 #include "private/bitwriter.h"
39 #include "private/crc.h"
40 #include "FLAC/assert.h"
41 #include "share/alloc.h"
42 #include "share/endswap.h"
44 /* Things should be fastest when this matches the machine word size */
45 /* WATCHOUT: if you change this you must also change the following #defines down to SWAP_BE_WORD_TO_HOST below to match */
46 /* WATCHOUT: there are a few places where the code will not work unless bwword is >= 32 bits wide */
47 typedef FLAC__uint32 bwword;
48 #define FLAC__BYTES_PER_WORD 4
49 #define FLAC__BITS_PER_WORD 32
50 #define FLAC__WORD_ALL_ONES ((FLAC__uint32)0xffffffff)
51 /* SWAP_BE_WORD_TO_HOST swaps bytes in a bwword (which is always big-endian) if necessary to match host byte order */
53 #define SWAP_BE_WORD_TO_HOST(x) (x)
55 #define SWAP_BE_WORD_TO_HOST(x) ENDSWAP_32(x)
59 * The default capacity here doesn't matter too much. The buffer always grows
60 * to hold whatever is written to it. Usually the encoder will stop adding at
61 * a frame or metadata block, then write that out and clear the buffer for the
64 static const unsigned FLAC__BITWRITER_DEFAULT_CAPACITY = 32768u / sizeof(bwword); /* size in words */
65 /* When growing, increment 4K at a time */
66 static const unsigned FLAC__BITWRITER_DEFAULT_INCREMENT = 4096u / sizeof(bwword); /* size in words */
68 #define FLAC__WORDS_TO_BITS(words) ((words) * FLAC__BITS_PER_WORD)
69 #define FLAC__TOTAL_BITS(bw) (FLAC__WORDS_TO_BITS((bw)->words) + (bw)->bits)
74 #define min(x,y) ((x)<(y)?(x):(y))
76 /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
78 #define FLAC__U64L(x) x
80 #define FLAC__U64L(x) x##LLU
87 struct FLAC__BitWriter {
89 bwword accum; /* accumulator; bits are right-justified; when full, accum is appended to buffer */
90 unsigned capacity; /* capacity of buffer in words */
91 unsigned words; /* # of complete words in buffer */
92 unsigned bits; /* # of used bits in accum */
95 /* * WATCHOUT: The current implementation only grows the buffer. */
96 static FLAC__bool bitwriter_grow_(FLAC__BitWriter *bw, unsigned bits_to_add)
98 unsigned new_capacity;
101 FLAC__ASSERT(0 != bw);
102 FLAC__ASSERT(0 != bw->buffer);
104 /* calculate total words needed to store 'bits_to_add' additional bits */
105 new_capacity = bw->words + ((bw->bits + bits_to_add + FLAC__BITS_PER_WORD - 1) / FLAC__BITS_PER_WORD);
107 /* it's possible (due to pessimism in the growth estimation that
108 * leads to this call) that we don't actually need to grow
110 if(bw->capacity >= new_capacity)
113 /* round up capacity increase to the nearest FLAC__BITWRITER_DEFAULT_INCREMENT */
114 if((new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT)
115 new_capacity += FLAC__BITWRITER_DEFAULT_INCREMENT - ((new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT);
116 /* make sure we got everything right */
117 FLAC__ASSERT(0 == (new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT);
118 FLAC__ASSERT(new_capacity > bw->capacity);
119 FLAC__ASSERT(new_capacity >= bw->words + ((bw->bits + bits_to_add + FLAC__BITS_PER_WORD - 1) / FLAC__BITS_PER_WORD));
121 new_buffer = safe_realloc_mul_2op_(bw->buffer, sizeof(bwword), /*times*/new_capacity);
124 bw->buffer = new_buffer;
125 bw->capacity = new_capacity;
130 /***********************************************************************
132 * Class constructor/destructor
134 ***********************************************************************/
136 FLAC__BitWriter *FLAC__bitwriter_new(void)
138 FLAC__BitWriter *bw = calloc(1, sizeof(FLAC__BitWriter));
139 /* note that calloc() sets all members to 0 for us */
143 void FLAC__bitwriter_delete(FLAC__BitWriter *bw)
145 FLAC__ASSERT(0 != bw);
147 FLAC__bitwriter_free(bw);
151 /***********************************************************************
153 * Public class methods
155 ***********************************************************************/
157 FLAC__bool FLAC__bitwriter_init(FLAC__BitWriter *bw)
159 FLAC__ASSERT(0 != bw);
161 bw->words = bw->bits = 0;
162 bw->capacity = FLAC__BITWRITER_DEFAULT_CAPACITY;
163 bw->buffer = malloc(sizeof(bwword) * bw->capacity);
170 void FLAC__bitwriter_free(FLAC__BitWriter *bw)
172 FLAC__ASSERT(0 != bw);
178 bw->words = bw->bits = 0;
181 void FLAC__bitwriter_clear(FLAC__BitWriter *bw)
183 bw->words = bw->bits = 0;
186 void FLAC__bitwriter_dump(const FLAC__BitWriter *bw, FILE *out)
190 fprintf(out, "bitwriter is NULL\n");
193 fprintf(out, "bitwriter: capacity=%u words=%u bits=%u total_bits=%u\n", bw->capacity, bw->words, bw->bits, FLAC__TOTAL_BITS(bw));
195 for(i = 0; i < bw->words; i++) {
196 fprintf(out, "%08X: ", i);
197 for(j = 0; j < FLAC__BITS_PER_WORD; j++)
198 fprintf(out, "%01u", bw->buffer[i] & (1 << (FLAC__BITS_PER_WORD-j-1)) ? 1:0);
202 fprintf(out, "%08X: ", i);
203 for(j = 0; j < bw->bits; j++)
204 fprintf(out, "%01u", bw->accum & (1 << (bw->bits-j-1)) ? 1:0);
210 FLAC__bool FLAC__bitwriter_get_write_crc16(FLAC__BitWriter *bw, FLAC__uint16 *crc)
212 const FLAC__byte *buffer;
215 FLAC__ASSERT((bw->bits & 7) == 0); /* assert that we're byte-aligned */
217 if(!FLAC__bitwriter_get_buffer(bw, &buffer, &bytes))
220 *crc = (FLAC__uint16)FLAC__crc16(buffer, bytes);
221 FLAC__bitwriter_release_buffer(bw);
225 FLAC__bool FLAC__bitwriter_get_write_crc8(FLAC__BitWriter *bw, FLAC__byte *crc)
227 const FLAC__byte *buffer;
230 FLAC__ASSERT((bw->bits & 7) == 0); /* assert that we're byte-aligned */
232 if(!FLAC__bitwriter_get_buffer(bw, &buffer, &bytes))
235 *crc = FLAC__crc8(buffer, bytes);
236 FLAC__bitwriter_release_buffer(bw);
240 FLAC__bool FLAC__bitwriter_is_byte_aligned(const FLAC__BitWriter *bw)
242 return ((bw->bits & 7) == 0);
245 unsigned FLAC__bitwriter_get_input_bits_unconsumed(const FLAC__BitWriter *bw)
247 return FLAC__TOTAL_BITS(bw);
250 FLAC__bool FLAC__bitwriter_get_buffer(FLAC__BitWriter *bw, const FLAC__byte **buffer, size_t *bytes)
252 FLAC__ASSERT((bw->bits & 7) == 0);
253 /* double protection */
256 /* if we have bits in the accumulator we have to flush those to the buffer first */
258 FLAC__ASSERT(bw->words <= bw->capacity);
259 if(bw->words == bw->capacity && !bitwriter_grow_(bw, FLAC__BITS_PER_WORD))
261 /* append bits as complete word to buffer, but don't change bw->accum or bw->bits */
262 bw->buffer[bw->words] = SWAP_BE_WORD_TO_HOST(bw->accum << (FLAC__BITS_PER_WORD-bw->bits));
264 /* now we can just return what we have */
265 *buffer = (FLAC__byte*)bw->buffer;
266 *bytes = (FLAC__BYTES_PER_WORD * bw->words) + (bw->bits >> 3);
270 void FLAC__bitwriter_release_buffer(FLAC__BitWriter *bw)
272 /* nothing to do. in the future, strict checking of a 'writer-is-in-
273 * get-mode' flag could be added everywhere and then cleared here
278 FLaC__INLINE FLAC__bool FLAC__bitwriter_write_zeroes(FLAC__BitWriter *bw, unsigned bits)
282 FLAC__ASSERT(0 != bw);
283 FLAC__ASSERT(0 != bw->buffer);
287 /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+bits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */
288 if(bw->capacity <= bw->words + bits && !bitwriter_grow_(bw, bits))
290 /* first part gets to word alignment */
292 n = min(FLAC__BITS_PER_WORD - bw->bits, bits);
296 if(bw->bits == FLAC__BITS_PER_WORD) {
297 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum);
304 while(bits >= FLAC__BITS_PER_WORD) {
305 bw->buffer[bw->words++] = 0;
306 bits -= FLAC__BITS_PER_WORD;
308 /* do any leftovers */
316 FLaC__INLINE FLAC__bool FLAC__bitwriter_write_raw_uint32(FLAC__BitWriter *bw, FLAC__uint32 val, unsigned bits)
318 register unsigned left;
320 /* WATCHOUT: code does not work with <32bit words; we can make things much faster with this assertion */
321 FLAC__ASSERT(FLAC__BITS_PER_WORD >= 32);
323 FLAC__ASSERT(0 != bw);
324 FLAC__ASSERT(0 != bw->buffer);
326 FLAC__ASSERT(bits <= 32);
330 /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+bits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */
331 if(bw->capacity <= bw->words + bits && !bitwriter_grow_(bw, bits))
334 left = FLAC__BITS_PER_WORD - bw->bits;
340 else if(bw->bits) { /* WATCHOUT: if bw->bits == 0, left==FLAC__BITS_PER_WORD and bw->accum<<=left is a NOP instead of setting to 0 */
342 bw->accum |= val >> (bw->bits = bits - left);
343 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum);
349 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(val);
355 FLaC__INLINE FLAC__bool FLAC__bitwriter_write_raw_int32(FLAC__BitWriter *bw, FLAC__int32 val, unsigned bits)
357 /* zero-out unused bits */
359 val &= (~(0xffffffff << bits));
361 return FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)val, bits);
364 FLaC__INLINE FLAC__bool FLAC__bitwriter_write_raw_uint64(FLAC__BitWriter *bw, FLAC__uint64 val, unsigned bits)
366 /* this could be a little faster but it's not used for much */
369 FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)(val>>32), bits-32) &&
370 FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)val, 32);
373 return FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)val, bits);
376 FLaC__INLINE FLAC__bool FLAC__bitwriter_write_raw_uint32_little_endian(FLAC__BitWriter *bw, FLAC__uint32 val)
378 /* this doesn't need to be that fast as currently it is only used for vorbis comments */
380 if(!FLAC__bitwriter_write_raw_uint32(bw, val & 0xff, 8))
382 if(!FLAC__bitwriter_write_raw_uint32(bw, (val>>8) & 0xff, 8))
384 if(!FLAC__bitwriter_write_raw_uint32(bw, (val>>16) & 0xff, 8))
386 if(!FLAC__bitwriter_write_raw_uint32(bw, val>>24, 8))
392 FLaC__INLINE FLAC__bool FLAC__bitwriter_write_byte_block(FLAC__BitWriter *bw, const FLAC__byte vals[], unsigned nvals)
396 /* this could be faster but currently we don't need it to be since it's only used for writing metadata */
397 for(i = 0; i < nvals; i++) {
398 if(!FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)(vals[i]), 8))
405 FLAC__bool FLAC__bitwriter_write_unary_unsigned(FLAC__BitWriter *bw, unsigned val)
408 return FLAC__bitwriter_write_raw_uint32(bw, 1, ++val);
411 FLAC__bitwriter_write_zeroes(bw, val) &&
412 FLAC__bitwriter_write_raw_uint32(bw, 1, 1);
415 unsigned FLAC__bitwriter_rice_bits(FLAC__int32 val, unsigned parameter)
419 FLAC__ASSERT(parameter < sizeof(unsigned)*8);
421 /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */
422 uval = (val<<1) ^ (val>>31);
424 return 1 + parameter + (uval >> parameter);
428 unsigned FLAC__bitwriter_golomb_bits_signed(int val, unsigned parameter)
430 unsigned bits, msbs, uval;
433 FLAC__ASSERT(parameter > 0);
435 /* fold signed to unsigned */
437 uval = (unsigned)(((-(++val)) << 1) + 1);
439 uval = (unsigned)(val << 1);
441 k = FLAC__bitmath_ilog2(parameter);
442 if(parameter == 1u<<k) {
443 FLAC__ASSERT(k <= 30);
451 d = (1 << (k+1)) - parameter;
452 q = uval / parameter;
453 r = uval - (q * parameter);
462 unsigned FLAC__bitwriter_golomb_bits_unsigned(unsigned uval, unsigned parameter)
467 FLAC__ASSERT(parameter > 0);
469 k = FLAC__bitmath_ilog2(parameter);
470 if(parameter == 1u<<k) {
471 FLAC__ASSERT(k <= 30);
479 d = (1 << (k+1)) - parameter;
480 q = uval / parameter;
481 r = uval - (q * parameter);
491 FLAC__bool FLAC__bitwriter_write_rice_signed(FLAC__BitWriter *bw, FLAC__int32 val, unsigned parameter)
493 unsigned total_bits, interesting_bits, msbs;
494 FLAC__uint32 uval, pattern;
496 FLAC__ASSERT(0 != bw);
497 FLAC__ASSERT(0 != bw->buffer);
498 FLAC__ASSERT(parameter < 8*sizeof(uval));
500 /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */
501 uval = (val<<1) ^ (val>>31);
503 msbs = uval >> parameter;
504 interesting_bits = 1 + parameter;
505 total_bits = interesting_bits + msbs;
506 pattern = 1 << parameter; /* the unary end bit */
507 pattern |= (uval & ((1<<parameter)-1)); /* the binary LSBs */
510 return FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits);
513 FLAC__bitwriter_write_zeroes(bw, msbs) && /* write the unary MSBs */
514 FLAC__bitwriter_write_raw_uint32(bw, pattern, interesting_bits); /* write the unary end bit and binary LSBs */
517 FLAC__bool FLAC__bitwriter_write_rice_signed_block(FLAC__BitWriter *bw, const FLAC__int32 *vals, unsigned nvals, unsigned parameter)
519 const FLAC__uint32 mask1 = FLAC__WORD_ALL_ONES << parameter; /* we val|=mask1 to set the stop bit above it... */
520 const FLAC__uint32 mask2 = FLAC__WORD_ALL_ONES >> (31-parameter); /* ...then mask off the bits above the stop bit with val&=mask2*/
523 const unsigned lsbits = 1 + parameter;
526 FLAC__ASSERT(0 != bw);
527 FLAC__ASSERT(0 != bw->buffer);
528 FLAC__ASSERT(parameter < 8*sizeof(bwword)-1);
529 /* WATCHOUT: code does not work with <32bit words; we can make things much faster with this assertion */
530 FLAC__ASSERT(FLAC__BITS_PER_WORD >= 32);
533 /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */
534 uval = (*vals<<1) ^ (*vals>>31);
536 msbits = uval >> parameter;
538 #if 0 /* OPT: can remove this special case if it doesn't make up for the extra compare (doesn't make a statistically significant difference with msvc or gcc/x86) */
539 if(bw->bits && bw->bits + msbits + lsbits <= FLAC__BITS_PER_WORD) { /* i.e. if the whole thing fits in the current bwword */
540 /* ^^^ if bw->bits is 0 then we may have filled the buffer and have no free bwword to work in */
541 bw->bits = bw->bits + msbits + lsbits;
542 uval |= mask1; /* set stop bit */
543 uval &= mask2; /* mask off unused top bits */
544 /* NOT: bw->accum <<= msbits + lsbits because msbits+lsbits could be 32, then the shift would be a NOP */
545 bw->accum <<= msbits;
546 bw->accum <<= lsbits;
548 if(bw->bits == FLAC__BITS_PER_WORD) {
549 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum);
551 /* burying the capacity check down here means we have to grow the buffer a little if there are more vals to do */
552 if(bw->capacity <= bw->words && nvals > 1 && !bitwriter_grow_(bw, 1)) {
553 FLAC__ASSERT(bw->capacity == bw->words);
559 #elif 1 /*@@@@@@ OPT: try this version with MSVC6 to see if better, not much difference for gcc-4 */
560 if(bw->bits && bw->bits + msbits + lsbits < FLAC__BITS_PER_WORD) { /* i.e. if the whole thing fits in the current bwword */
561 /* ^^^ if bw->bits is 0 then we may have filled the buffer and have no free bwword to work in */
562 bw->bits = bw->bits + msbits + lsbits;
563 uval |= mask1; /* set stop bit */
564 uval &= mask2; /* mask off unused top bits */
565 bw->accum <<= msbits + lsbits;
570 /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+msbits+lsbits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */
571 /* OPT: pessimism may cause flurry of false calls to grow_ which eat up all savings before it */
572 if(bw->capacity <= bw->words + bw->bits + msbits + 1/*lsbits always fit in 1 bwword*/ && !bitwriter_grow_(bw, msbits+lsbits))
576 /* first part gets to word alignment */
578 left = FLAC__BITS_PER_WORD - bw->bits;
580 bw->accum <<= msbits;
587 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum);
592 while(msbits >= FLAC__BITS_PER_WORD) {
593 bw->buffer[bw->words++] = 0;
594 msbits -= FLAC__BITS_PER_WORD;
596 /* do any leftovers */
603 uval |= mask1; /* set stop bit */
604 uval &= mask2; /* mask off unused top bits */
606 left = FLAC__BITS_PER_WORD - bw->bits;
608 bw->accum <<= lsbits;
613 /* if bw->bits == 0, left==FLAC__BITS_PER_WORD which will always
614 * be > lsbits (because of previous assertions) so it would have
615 * triggered the (lsbits<left) case above.
617 FLAC__ASSERT(bw->bits);
618 FLAC__ASSERT(left < FLAC__BITS_PER_WORD);
620 bw->accum |= uval >> (bw->bits = lsbits - left);
621 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum);
634 FLAC__bool FLAC__bitwriter_write_golomb_signed(FLAC__BitWriter *bw, int val, unsigned parameter)
636 unsigned total_bits, msbs, uval;
639 FLAC__ASSERT(0 != bw);
640 FLAC__ASSERT(0 != bw->buffer);
641 FLAC__ASSERT(parameter > 0);
643 /* fold signed to unsigned */
645 uval = (unsigned)(((-(++val)) << 1) + 1);
647 uval = (unsigned)(val << 1);
649 k = FLAC__bitmath_ilog2(parameter);
650 if(parameter == 1u<<k) {
653 FLAC__ASSERT(k <= 30);
656 total_bits = 1 + k + msbs;
657 pattern = 1 << k; /* the unary end bit */
658 pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */
660 if(total_bits <= 32) {
661 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits))
665 /* write the unary MSBs */
666 if(!FLAC__bitwriter_write_zeroes(bw, msbs))
668 /* write the unary end bit and binary LSBs */
669 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, k+1))
676 d = (1 << (k+1)) - parameter;
677 q = uval / parameter;
678 r = uval - (q * parameter);
679 /* write the unary MSBs */
680 if(!FLAC__bitwriter_write_zeroes(bw, q))
682 /* write the unary end bit */
683 if(!FLAC__bitwriter_write_raw_uint32(bw, 1, 1))
685 /* write the binary LSBs */
687 if(!FLAC__bitwriter_write_raw_uint32(bw, r+d, k+1))
691 if(!FLAC__bitwriter_write_raw_uint32(bw, r, k))
698 FLAC__bool FLAC__bitwriter_write_golomb_unsigned(FLAC__BitWriter *bw, unsigned uval, unsigned parameter)
700 unsigned total_bits, msbs;
703 FLAC__ASSERT(0 != bw);
704 FLAC__ASSERT(0 != bw->buffer);
705 FLAC__ASSERT(parameter > 0);
707 k = FLAC__bitmath_ilog2(parameter);
708 if(parameter == 1u<<k) {
711 FLAC__ASSERT(k <= 30);
714 total_bits = 1 + k + msbs;
715 pattern = 1 << k; /* the unary end bit */
716 pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */
718 if(total_bits <= 32) {
719 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits))
723 /* write the unary MSBs */
724 if(!FLAC__bitwriter_write_zeroes(bw, msbs))
726 /* write the unary end bit and binary LSBs */
727 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, k+1))
734 d = (1 << (k+1)) - parameter;
735 q = uval / parameter;
736 r = uval - (q * parameter);
737 /* write the unary MSBs */
738 if(!FLAC__bitwriter_write_zeroes(bw, q))
740 /* write the unary end bit */
741 if(!FLAC__bitwriter_write_raw_uint32(bw, 1, 1))
743 /* write the binary LSBs */
745 if(!FLAC__bitwriter_write_raw_uint32(bw, r+d, k+1))
749 if(!FLAC__bitwriter_write_raw_uint32(bw, r, k))
757 FLAC__bool FLAC__bitwriter_write_utf8_uint32(FLAC__BitWriter *bw, FLAC__uint32 val)
761 FLAC__ASSERT(0 != bw);
762 FLAC__ASSERT(0 != bw->buffer);
764 FLAC__ASSERT(!(val & 0x80000000)); /* this version only handles 31 bits */
767 return FLAC__bitwriter_write_raw_uint32(bw, val, 8);
769 else if(val < 0x800) {
770 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xC0 | (val>>6), 8);
771 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (val&0x3F), 8);
773 else if(val < 0x10000) {
774 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xE0 | (val>>12), 8);
775 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>6)&0x3F), 8);
776 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (val&0x3F), 8);
778 else if(val < 0x200000) {
779 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xF0 | (val>>18), 8);
780 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>12)&0x3F), 8);
781 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>6)&0x3F), 8);
782 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (val&0x3F), 8);
784 else if(val < 0x4000000) {
785 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xF8 | (val>>24), 8);
786 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>18)&0x3F), 8);
787 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>12)&0x3F), 8);
788 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>6)&0x3F), 8);
789 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (val&0x3F), 8);
792 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xFC | (val>>30), 8);
793 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>24)&0x3F), 8);
794 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>18)&0x3F), 8);
795 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>12)&0x3F), 8);
796 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | ((val>>6)&0x3F), 8);
797 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (val&0x3F), 8);
803 FLAC__bool FLAC__bitwriter_write_utf8_uint64(FLAC__BitWriter *bw, FLAC__uint64 val)
807 FLAC__ASSERT(0 != bw);
808 FLAC__ASSERT(0 != bw->buffer);
810 FLAC__ASSERT(!(val & FLAC__U64L(0xFFFFFFF000000000))); /* this version only handles 36 bits */
813 return FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)val, 8);
815 else if(val < 0x800) {
816 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xC0 | (FLAC__uint32)(val>>6), 8);
817 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8);
819 else if(val < 0x10000) {
820 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xE0 | (FLAC__uint32)(val>>12), 8);
821 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
822 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8);
824 else if(val < 0x200000) {
825 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xF0 | (FLAC__uint32)(val>>18), 8);
826 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
827 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
828 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8);
830 else if(val < 0x4000000) {
831 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xF8 | (FLAC__uint32)(val>>24), 8);
832 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8);
833 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
834 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
835 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8);
837 else if(val < 0x80000000) {
838 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xFC | (FLAC__uint32)(val>>30), 8);
839 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8);
840 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8);
841 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
842 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
843 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8);
846 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0xFE, 8);
847 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>30)&0x3F), 8);
848 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8);
849 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8);
850 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
851 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
852 ok &= FLAC__bitwriter_write_raw_uint32(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8);
858 FLAC__bool FLAC__bitwriter_zero_pad_to_byte_boundary(FLAC__BitWriter *bw)
860 /* 0-pad to byte boundary */
862 return FLAC__bitwriter_write_zeroes(bw, 8 - (bw->bits & 7u));