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Diffstat (limited to 'deps/flac-1.3.2/src/libFLAC/bitwriter.c')
| -rw-r--r-- | deps/flac-1.3.2/src/libFLAC/bitwriter.c | 881 |
1 files changed, 0 insertions, 881 deletions
diff --git a/deps/flac-1.3.2/src/libFLAC/bitwriter.c b/deps/flac-1.3.2/src/libFLAC/bitwriter.c deleted file mode 100644 index 402b1c4..0000000 --- a/deps/flac-1.3.2/src/libFLAC/bitwriter.c +++ /dev/null @@ -1,881 +0,0 @@ -/* libFLAC - Free Lossless Audio Codec library - * Copyright (C) 2000-2009 Josh Coalson - * Copyright (C) 2011-2016 Xiph.Org Foundation - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * - Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * - Neither the name of the Xiph.org Foundation nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR - * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif - -#include <stdlib.h> -#include <string.h> -#include "private/bitwriter.h" -#include "private/crc.h" -#include "private/macros.h" -#include "FLAC/assert.h" -#include "share/alloc.h" -#include "share/compat.h" -#include "share/endswap.h" - -/* Things should be fastest when this matches the machine word size */ -/* WATCHOUT: if you change this you must also change the following #defines down to SWAP_BE_WORD_TO_HOST below to match */ -/* WATCHOUT: there are a few places where the code will not work unless bwword is >= 32 bits wide */ - -#if (ENABLE_64_BIT_WORDS == 0) - -typedef FLAC__uint32 bwword; -#define FLAC__BYTES_PER_WORD 4 /* sizeof bwword */ -#define FLAC__BITS_PER_WORD 32 -/* SWAP_BE_WORD_TO_HOST swaps bytes in a bwword (which is always big-endian) if necessary to match host byte order */ -#if WORDS_BIGENDIAN -#define SWAP_BE_WORD_TO_HOST(x) (x) -#else -#define SWAP_BE_WORD_TO_HOST(x) ENDSWAP_32(x) -#endif - -#else - -typedef FLAC__uint64 bwword; -#define FLAC__BYTES_PER_WORD 8 /* sizeof bwword */ -#define FLAC__BITS_PER_WORD 64 -/* SWAP_BE_WORD_TO_HOST swaps bytes in a bwword (which is always big-endian) if necessary to match host byte order */ -#if WORDS_BIGENDIAN -#define SWAP_BE_WORD_TO_HOST(x) (x) -#else -#define SWAP_BE_WORD_TO_HOST(x) ENDSWAP_64(x) -#endif - -#endif - -/* - * The default capacity here doesn't matter too much. The buffer always grows - * to hold whatever is written to it. Usually the encoder will stop adding at - * a frame or metadata block, then write that out and clear the buffer for the - * next one. - */ -static const unsigned FLAC__BITWRITER_DEFAULT_CAPACITY = 32768u / sizeof(bwword); /* size in words */ -/* When growing, increment 4K at a time */ -static const unsigned FLAC__BITWRITER_DEFAULT_INCREMENT = 4096u / sizeof(bwword); /* size in words */ - -#define FLAC__WORDS_TO_BITS(words) ((words) * FLAC__BITS_PER_WORD) -#define FLAC__TOTAL_BITS(bw) (FLAC__WORDS_TO_BITS((bw)->words) + (bw)->bits) - -struct FLAC__BitWriter { - bwword *buffer; - bwword accum; /* accumulator; bits are right-justified; when full, accum is appended to buffer */ - unsigned capacity; /* capacity of buffer in words */ - unsigned words; /* # of complete words in buffer */ - unsigned bits; /* # of used bits in accum */ -}; - -/* * WATCHOUT: The current implementation only grows the buffer. */ -#ifndef __SUNPRO_C -static -#endif -FLAC__bool bitwriter_grow_(FLAC__BitWriter *bw, unsigned bits_to_add) -{ - unsigned new_capacity; - bwword *new_buffer; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - - /* calculate total words needed to store 'bits_to_add' additional bits */ - new_capacity = bw->words + ((bw->bits + bits_to_add + FLAC__BITS_PER_WORD - 1) / FLAC__BITS_PER_WORD); - - /* it's possible (due to pessimism in the growth estimation that - * leads to this call) that we don't actually need to grow - */ - if(bw->capacity >= new_capacity) - return true; - - /* round up capacity increase to the nearest FLAC__BITWRITER_DEFAULT_INCREMENT */ - if((new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT) - new_capacity += FLAC__BITWRITER_DEFAULT_INCREMENT - ((new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT); - /* make sure we got everything right */ - FLAC__ASSERT(0 == (new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT); - FLAC__ASSERT(new_capacity > bw->capacity); - FLAC__ASSERT(new_capacity >= bw->words + ((bw->bits + bits_to_add + FLAC__BITS_PER_WORD - 1) / FLAC__BITS_PER_WORD)); - - new_buffer = safe_realloc_mul_2op_(bw->buffer, sizeof(bwword), /*times*/new_capacity); - if(new_buffer == 0) - return false; - bw->buffer = new_buffer; - bw->capacity = new_capacity; - return true; -} - - -/*********************************************************************** - * - * Class constructor/destructor - * - ***********************************************************************/ - -FLAC__BitWriter *FLAC__bitwriter_new(void) -{ - FLAC__BitWriter *bw = calloc(1, sizeof(FLAC__BitWriter)); - /* note that calloc() sets all members to 0 for us */ - return bw; -} - -void FLAC__bitwriter_delete(FLAC__BitWriter *bw) -{ - FLAC__ASSERT(0 != bw); - - FLAC__bitwriter_free(bw); - free(bw); -} - -/*********************************************************************** - * - * Public class methods - * - ***********************************************************************/ - -FLAC__bool FLAC__bitwriter_init(FLAC__BitWriter *bw) -{ - FLAC__ASSERT(0 != bw); - - bw->words = bw->bits = 0; - bw->capacity = FLAC__BITWRITER_DEFAULT_CAPACITY; - bw->buffer = malloc(sizeof(bwword) * bw->capacity); - if(bw->buffer == 0) - return false; - - return true; -} - -void FLAC__bitwriter_free(FLAC__BitWriter *bw) -{ - FLAC__ASSERT(0 != bw); - - if(0 != bw->buffer) - free(bw->buffer); - bw->buffer = 0; - bw->capacity = 0; - bw->words = bw->bits = 0; -} - -void FLAC__bitwriter_clear(FLAC__BitWriter *bw) -{ - bw->words = bw->bits = 0; -} - -void FLAC__bitwriter_dump(const FLAC__BitWriter *bw, FILE *out) -{ - unsigned i, j; - if(bw == 0) { - fprintf(out, "bitwriter is NULL\n"); - } - else { - fprintf(out, "bitwriter: capacity=%u words=%u bits=%u total_bits=%u\n", bw->capacity, bw->words, bw->bits, FLAC__TOTAL_BITS(bw)); - - for(i = 0; i < bw->words; i++) { - fprintf(out, "%08X: ", i); - for(j = 0; j < FLAC__BITS_PER_WORD; j++) - fprintf(out, "%01u", bw->buffer[i] & ((bwword)1 << (FLAC__BITS_PER_WORD-j-1)) ? 1:0); - fprintf(out, "\n"); - } - if(bw->bits > 0) { - fprintf(out, "%08X: ", i); - for(j = 0; j < bw->bits; j++) - fprintf(out, "%01u", bw->accum & ((bwword)1 << (bw->bits-j-1)) ? 1:0); - fprintf(out, "\n"); - } - } -} - -FLAC__bool FLAC__bitwriter_get_write_crc16(FLAC__BitWriter *bw, FLAC__uint16 *crc) -{ - const FLAC__byte *buffer; - size_t bytes; - - FLAC__ASSERT((bw->bits & 7) == 0); /* assert that we're byte-aligned */ - - if(!FLAC__bitwriter_get_buffer(bw, &buffer, &bytes)) - return false; - - *crc = (FLAC__uint16)FLAC__crc16(buffer, bytes); - FLAC__bitwriter_release_buffer(bw); - return true; -} - -FLAC__bool FLAC__bitwriter_get_write_crc8(FLAC__BitWriter *bw, FLAC__byte *crc) -{ - const FLAC__byte *buffer; - size_t bytes; - - FLAC__ASSERT((bw->bits & 7) == 0); /* assert that we're byte-aligned */ - - if(!FLAC__bitwriter_get_buffer(bw, &buffer, &bytes)) - return false; - - *crc = FLAC__crc8(buffer, bytes); - FLAC__bitwriter_release_buffer(bw); - return true; -} - -FLAC__bool FLAC__bitwriter_is_byte_aligned(const FLAC__BitWriter *bw) -{ - return ((bw->bits & 7) == 0); -} - -unsigned FLAC__bitwriter_get_input_bits_unconsumed(const FLAC__BitWriter *bw) -{ - return FLAC__TOTAL_BITS(bw); -} - -FLAC__bool FLAC__bitwriter_get_buffer(FLAC__BitWriter *bw, const FLAC__byte **buffer, size_t *bytes) -{ - FLAC__ASSERT((bw->bits & 7) == 0); - /* double protection */ - if(bw->bits & 7) - return false; - /* if we have bits in the accumulator we have to flush those to the buffer first */ - if(bw->bits) { - FLAC__ASSERT(bw->words <= bw->capacity); - if(bw->words == bw->capacity && !bitwriter_grow_(bw, FLAC__BITS_PER_WORD)) - return false; - /* append bits as complete word to buffer, but don't change bw->accum or bw->bits */ - bw->buffer[bw->words] = SWAP_BE_WORD_TO_HOST(bw->accum << (FLAC__BITS_PER_WORD-bw->bits)); - } - /* now we can just return what we have */ - *buffer = (FLAC__byte*)bw->buffer; - *bytes = (FLAC__BYTES_PER_WORD * bw->words) + (bw->bits >> 3); - return true; -} - -void FLAC__bitwriter_release_buffer(FLAC__BitWriter *bw) -{ - /* nothing to do. in the future, strict checking of a 'writer-is-in- - * get-mode' flag could be added everywhere and then cleared here - */ - (void)bw; -} - -inline FLAC__bool FLAC__bitwriter_write_zeroes(FLAC__BitWriter *bw, unsigned bits) -{ - unsigned n; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - - if(bits == 0) - return true; - /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+bits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */ - if(bw->capacity <= bw->words + bits && !bitwriter_grow_(bw, bits)) - return false; - /* first part gets to word alignment */ - if(bw->bits) { - n = flac_min(FLAC__BITS_PER_WORD - bw->bits, bits); - bw->accum <<= n; - bits -= n; - bw->bits += n; - if(bw->bits == FLAC__BITS_PER_WORD) { - bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); - bw->bits = 0; - } - else - return true; - } - /* do whole words */ - while(bits >= FLAC__BITS_PER_WORD) { - bw->buffer[bw->words++] = 0; - bits -= FLAC__BITS_PER_WORD; - } - /* do any leftovers */ - if(bits > 0) { - bw->accum = 0; - bw->bits = bits; - } - return true; -} - -static inline FLAC__bool FLAC__bitwriter_write_raw_uint32_nocheck(FLAC__BitWriter *bw, FLAC__uint32 val, unsigned bits) -{ - register unsigned left; - - /* WATCHOUT: code does not work with <32bit words; we can make things much faster with this assertion */ - FLAC__ASSERT(FLAC__BITS_PER_WORD >= 32); - - if(bw == 0 || bw->buffer == 0) - return false; - - if (bits > 32) - return false; - - if(bits == 0) - return true; - - FLAC__ASSERT((bits == 32) || (val>>bits == 0)); - - /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+bits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */ - if(bw->capacity <= bw->words + bits && !bitwriter_grow_(bw, bits)) - return false; - - left = FLAC__BITS_PER_WORD - bw->bits; - if(bits < left) { - bw->accum <<= bits; - bw->accum |= val; - bw->bits += bits; - } - 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 */ - bw->accum <<= left; - bw->accum |= val >> (bw->bits = bits - left); - bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); - bw->accum = val; /* unused top bits can contain garbage */ - } - else { /* at this point bits == FLAC__BITS_PER_WORD == 32 and bw->bits == 0 */ - bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST((bwword)val); - } - - return true; -} - -inline FLAC__bool FLAC__bitwriter_write_raw_uint32(FLAC__BitWriter *bw, FLAC__uint32 val, unsigned bits) -{ - /* check that unused bits are unset */ - if((bits < 32) && (val>>bits != 0)) - return false; - - return FLAC__bitwriter_write_raw_uint32_nocheck(bw, val, bits); -} - -inline FLAC__bool FLAC__bitwriter_write_raw_int32(FLAC__BitWriter *bw, FLAC__int32 val, unsigned bits) -{ - /* zero-out unused bits */ - if(bits < 32) - val &= (~(0xffffffff << bits)); - - return FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)val, bits); -} - -inline FLAC__bool FLAC__bitwriter_write_raw_uint64(FLAC__BitWriter *bw, FLAC__uint64 val, unsigned bits) -{ - /* this could be a little faster but it's not used for much */ - if(bits > 32) { - return - FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)(val>>32), bits-32) && - FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)val, 32); - } - else - return FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)val, bits); -} - -inline FLAC__bool FLAC__bitwriter_write_raw_uint32_little_endian(FLAC__BitWriter *bw, FLAC__uint32 val) -{ - /* this doesn't need to be that fast as currently it is only used for vorbis comments */ - - if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, val & 0xff, 8)) - return false; - if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, (val>>8) & 0xff, 8)) - return false; - if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, (val>>16) & 0xff, 8)) - return false; - if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, val>>24, 8)) - return false; - - return true; -} - -inline FLAC__bool FLAC__bitwriter_write_byte_block(FLAC__BitWriter *bw, const FLAC__byte vals[], unsigned nvals) -{ - unsigned i; - - /* this could be faster but currently we don't need it to be since it's only used for writing metadata */ - for(i = 0; i < nvals; i++) { - if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)(vals[i]), 8)) - return false; - } - - return true; -} - -FLAC__bool FLAC__bitwriter_write_unary_unsigned(FLAC__BitWriter *bw, unsigned val) -{ - if(val < 32) - return FLAC__bitwriter_write_raw_uint32_nocheck(bw, 1, ++val); - else - return - FLAC__bitwriter_write_zeroes(bw, val) && - FLAC__bitwriter_write_raw_uint32_nocheck(bw, 1, 1); -} - -unsigned FLAC__bitwriter_rice_bits(FLAC__int32 val, unsigned parameter) -{ - FLAC__uint32 uval; - - FLAC__ASSERT(parameter < 32); - - /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */ - uval = val; - uval <<= 1; - uval ^= (val>>31); - - return 1 + parameter + (uval >> parameter); -} - -#if 0 /* UNUSED */ -unsigned FLAC__bitwriter_golomb_bits_signed(int val, unsigned parameter) -{ - unsigned bits, msbs, uval; - unsigned k; - - FLAC__ASSERT(parameter > 0); - - /* fold signed to unsigned */ - if(val < 0) - uval = (unsigned)(((-(++val)) << 1) + 1); - else - uval = (unsigned)(val << 1); - - k = FLAC__bitmath_ilog2(parameter); - if(parameter == 1u<<k) { - FLAC__ASSERT(k <= 30); - - msbs = uval >> k; - bits = 1 + k + msbs; - } - else { - unsigned q, r, d; - - d = (1 << (k+1)) - parameter; - q = uval / parameter; - r = uval - (q * parameter); - - bits = 1 + q + k; - if(r >= d) - bits++; - } - return bits; -} - -unsigned FLAC__bitwriter_golomb_bits_unsigned(unsigned uval, unsigned parameter) -{ - unsigned bits, msbs; - unsigned k; - - FLAC__ASSERT(parameter > 0); - - k = FLAC__bitmath_ilog2(parameter); - if(parameter == 1u<<k) { - FLAC__ASSERT(k <= 30); - - msbs = uval >> k; - bits = 1 + k + msbs; - } - else { - unsigned q, r, d; - - d = (1 << (k+1)) - parameter; - q = uval / parameter; - r = uval - (q * parameter); - - bits = 1 + q + k; - if(r >= d) - bits++; - } - return bits; -} -#endif /* UNUSED */ - -FLAC__bool FLAC__bitwriter_write_rice_signed(FLAC__BitWriter *bw, FLAC__int32 val, unsigned parameter) -{ - unsigned total_bits, interesting_bits, msbs; - FLAC__uint32 uval, pattern; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - FLAC__ASSERT(parameter < 32); - - /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */ - uval = val; - uval <<= 1; - uval ^= (val>>31); - - msbs = uval >> parameter; - interesting_bits = 1 + parameter; - total_bits = interesting_bits + msbs; - pattern = 1 << parameter; /* the unary end bit */ - pattern |= (uval & ((1<<parameter)-1)); /* the binary LSBs */ - - if(total_bits <= 32) - return FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits); - else - return - FLAC__bitwriter_write_zeroes(bw, msbs) && /* write the unary MSBs */ - FLAC__bitwriter_write_raw_uint32(bw, pattern, interesting_bits); /* write the unary end bit and binary LSBs */ -} - -FLAC__bool FLAC__bitwriter_write_rice_signed_block(FLAC__BitWriter *bw, const FLAC__int32 *vals, unsigned nvals, unsigned parameter) -{ - const FLAC__uint32 mask1 = (FLAC__uint32)0xffffffff << parameter; /* we val|=mask1 to set the stop bit above it... */ - const FLAC__uint32 mask2 = (FLAC__uint32)0xffffffff >> (31-parameter); /* ...then mask off the bits above the stop bit with val&=mask2 */ - FLAC__uint32 uval; - unsigned left; - const unsigned lsbits = 1 + parameter; - unsigned msbits, total_bits; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - FLAC__ASSERT(parameter < 31); - /* WATCHOUT: code does not work with <32bit words; we can make things much faster with this assertion */ - FLAC__ASSERT(FLAC__BITS_PER_WORD >= 32); - - while(nvals) { - /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */ - uval = *vals; - uval <<= 1; - uval ^= (*vals>>31); - - msbits = uval >> parameter; - total_bits = lsbits + msbits; - - if(bw->bits && bw->bits + total_bits < FLAC__BITS_PER_WORD) { /* i.e. if the whole thing fits in the current bwword */ - /* ^^^ if bw->bits is 0 then we may have filled the buffer and have no free bwword to work in */ - bw->bits += total_bits; - uval |= mask1; /* set stop bit */ - uval &= mask2; /* mask off unused top bits */ - bw->accum <<= total_bits; - bw->accum |= uval; - } - else { - /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+msbits+lsbits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */ - /* OPT: pessimism may cause flurry of false calls to grow_ which eat up all savings before it */ - if(bw->capacity <= bw->words + bw->bits + msbits + 1 /* lsbits always fit in 1 bwword */ && !bitwriter_grow_(bw, total_bits)) - return false; - - if(msbits) { - /* first part gets to word alignment */ - if(bw->bits) { - left = FLAC__BITS_PER_WORD - bw->bits; - if(msbits < left) { - bw->accum <<= msbits; - bw->bits += msbits; - goto break1; - } - else { - bw->accum <<= left; - msbits -= left; - bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); - bw->bits = 0; - } - } - /* do whole words */ - while(msbits >= FLAC__BITS_PER_WORD) { - bw->buffer[bw->words++] = 0; - msbits -= FLAC__BITS_PER_WORD; - } - /* do any leftovers */ - if(msbits > 0) { - bw->accum = 0; - bw->bits = msbits; - } - } -break1: - uval |= mask1; /* set stop bit */ - uval &= mask2; /* mask off unused top bits */ - - left = FLAC__BITS_PER_WORD - bw->bits; - if(lsbits < left) { - bw->accum <<= lsbits; - bw->accum |= uval; - bw->bits += lsbits; - } - else { - /* if bw->bits == 0, left==FLAC__BITS_PER_WORD which will always - * be > lsbits (because of previous assertions) so it would have - * triggered the (lsbits<left) case above. - */ - FLAC__ASSERT(bw->bits); - FLAC__ASSERT(left < FLAC__BITS_PER_WORD); - bw->accum <<= left; - bw->accum |= uval >> (bw->bits = lsbits - left); - bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); - bw->accum = uval; /* unused top bits can contain garbage */ - } - } - vals++; - nvals--; - } - return true; -} - -#if 0 /* UNUSED */ -FLAC__bool FLAC__bitwriter_write_golomb_signed(FLAC__BitWriter *bw, int val, unsigned parameter) -{ - unsigned total_bits, msbs, uval; - unsigned k; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - FLAC__ASSERT(parameter > 0); - - /* fold signed to unsigned */ - if(val < 0) - uval = (unsigned)(((-(++val)) << 1) + 1); - else - uval = (unsigned)(val << 1); - - k = FLAC__bitmath_ilog2(parameter); - if(parameter == 1u<<k) { - unsigned pattern; - - FLAC__ASSERT(k <= 30); - - msbs = uval >> k; - total_bits = 1 + k + msbs; - pattern = 1 << k; /* the unary end bit */ - pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */ - - if(total_bits <= 32) { - if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits)) - return false; - } - else { - /* write the unary MSBs */ - if(!FLAC__bitwriter_write_zeroes(bw, msbs)) - return false; - /* write the unary end bit and binary LSBs */ - if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, k+1)) - return false; - } - } - else { - unsigned q, r, d; - - d = (1 << (k+1)) - parameter; - q = uval / parameter; - r = uval - (q * parameter); - /* write the unary MSBs */ - if(!FLAC__bitwriter_write_zeroes(bw, q)) - return false; - /* write the unary end bit */ - if(!FLAC__bitwriter_write_raw_uint32(bw, 1, 1)) - return false; - /* write the binary LSBs */ - if(r >= d) { - if(!FLAC__bitwriter_write_raw_uint32(bw, r+d, k+1)) - return false; - } - else { - if(!FLAC__bitwriter_write_raw_uint32(bw, r, k)) - return false; - } - } - return true; -} - -FLAC__bool FLAC__bitwriter_write_golomb_unsigned(FLAC__BitWriter *bw, unsigned uval, unsigned parameter) -{ - unsigned total_bits, msbs; - unsigned k; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - FLAC__ASSERT(parameter > 0); - - k = FLAC__bitmath_ilog2(parameter); - if(parameter == 1u<<k) { - unsigned pattern; - - FLAC__ASSERT(k <= 30); - - msbs = uval >> k; - total_bits = 1 + k + msbs; - pattern = 1 << k; /* the unary end bit */ - pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */ - - if(total_bits <= 32) { - if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits)) - return false; - } - else { - /* write the unary MSBs */ - if(!FLAC__bitwriter_write_zeroes(bw, msbs)) - return false; - /* write the unary end bit and binary LSBs */ - if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, k+1)) - return false; - } - } - else { - unsigned q, r, d; - - d = (1 << (k+1)) - parameter; - q = uval / parameter; - r = uval - (q * parameter); - /* write the unary MSBs */ - if(!FLAC__bitwriter_write_zeroes(bw, q)) - return false; - /* write the unary end bit */ - if(!FLAC__bitwriter_write_raw_uint32(bw, 1, 1)) - return false; - /* write the binary LSBs */ - if(r >= d) { - if(!FLAC__bitwriter_write_raw_uint32(bw, r+d, k+1)) - return false; - } - else { - if(!FLAC__bitwriter_write_raw_uint32(bw, r, k)) - return false; - } - } - return true; -} -#endif /* UNUSED */ - -FLAC__bool FLAC__bitwriter_write_utf8_uint32(FLAC__BitWriter *bw, FLAC__uint32 val) -{ - FLAC__bool ok = 1; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - - if((val & 0x80000000) != 0) /* this version only handles 31 bits */ - return false; - - if(val < 0x80) { - return FLAC__bitwriter_write_raw_uint32_nocheck(bw, val, 8); - } - else if(val < 0x800) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xC0 | (val>>6), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); - } - else if(val < 0x10000) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xE0 | (val>>12), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); - } - else if(val < 0x200000) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF0 | (val>>18), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>12)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); - } - else if(val < 0x4000000) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF8 | (val>>24), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>18)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>12)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); - } - else { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xFC | (val>>30), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>24)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>18)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>12)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); - } - - return ok; -} - -FLAC__bool FLAC__bitwriter_write_utf8_uint64(FLAC__BitWriter *bw, FLAC__uint64 val) -{ - FLAC__bool ok = 1; - - FLAC__ASSERT(0 != bw); - FLAC__ASSERT(0 != bw->buffer); - - if((val & FLAC__U64L(0xFFFFFFF000000000)) != 0) /* this version only handles 36 bits */ - return false; - - if(val < 0x80) { - return FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)val, 8); - } - else if(val < 0x800) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xC0 | (FLAC__uint32)(val>>6), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); - } - else if(val < 0x10000) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xE0 | (FLAC__uint32)(val>>12), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); - } - else if(val < 0x200000) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF0 | (FLAC__uint32)(val>>18), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); - } - else if(val < 0x4000000) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF8 | (FLAC__uint32)(val>>24), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); - } - else if(val < 0x80000000) { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xFC | (FLAC__uint32)(val>>30), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); - } - else { - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xFE, 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>30)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); - ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); - } - - return ok; -} - -FLAC__bool FLAC__bitwriter_zero_pad_to_byte_boundary(FLAC__BitWriter *bw) -{ - /* 0-pad to byte boundary */ - if(bw->bits & 7u) - return FLAC__bitwriter_write_zeroes(bw, 8 - (bw->bits & 7u)); - else - return true; -} - -/* These functions are declared inline in this file but are also callable as - * externs from elsewhere. - * According to the C99 spec, section 6.7.4, simply providing a function - * prototype in a header file without 'inline' and making the function inline - * in this file should be sufficient. - * Unfortunately, the Microsoft VS compiler doesn't pick them up externally. To - * fix that we add extern declarations here. - */ -extern FLAC__bool FLAC__bitwriter_write_zeroes(FLAC__BitWriter *bw, unsigned bits); -extern FLAC__bool FLAC__bitwriter_write_raw_uint32(FLAC__BitWriter *bw, FLAC__uint32 val, unsigned bits); -extern FLAC__bool FLAC__bitwriter_write_raw_int32(FLAC__BitWriter *bw, FLAC__int32 val, unsigned bits); -extern FLAC__bool FLAC__bitwriter_write_raw_uint64(FLAC__BitWriter *bw, FLAC__uint64 val, unsigned bits); -extern FLAC__bool FLAC__bitwriter_write_raw_uint32_little_endian(FLAC__BitWriter *bw, FLAC__uint32 val); -extern FLAC__bool FLAC__bitwriter_write_byte_block(FLAC__BitWriter *bw, const FLAC__byte vals[], unsigned nvals); |