80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/*
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*
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* Copyright 2015 Rockchip Electronics Co. LTD
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include "mpp_bitput.h"
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RK_S32 mpp_set_bitput_ctx(BitputCtx_t *bp, RK_U64 *data, RK_U32 len)
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{
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memset(bp, 0, sizeof(BitputCtx_t));
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bp->index = 0;
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bp->bitpos = 0;
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bp->bvalue = 0;
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bp->size = len;
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bp->buflen = len; // align 64bit
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bp->pbuf = data;
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return 0;
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}
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void mpp_put_bits(BitputCtx_t *bp, RK_U64 invalue, RK_S32 lbits)
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{
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RK_U8 hbits = 0;
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if (!lbits) return;
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if (bp->index >= bp->buflen) return;
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hbits = 64 - lbits;
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invalue = (invalue << hbits) >> hbits;
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bp->bvalue |= invalue << bp->bitpos; // high bits value
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if ((bp->bitpos + lbits) >= 64) {
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bp->pbuf[bp->index] = bp->bvalue;
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bp->bvalue = invalue >> (64 - bp->bitpos); // low bits value
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bp->index++;
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}
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if (bp->index >= bp->buflen)
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return;
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bp->pbuf[bp->index] = bp->bvalue;
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bp->bitpos = (bp->bitpos + lbits) & 63;
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// mpp_log("bp->index = %d bp->bitpos = %d lbits = %d invalue 0x%x bp->hvalue 0x%x bp->lvalue 0x%x",bp->index,bp->bitpos,lbits, (RK_U32)invalue,(RK_U32)(bp->bvalue >> 32),(RK_U32)bp->bvalue);
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}
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void mpp_put_align(BitputCtx_t *bp, RK_S32 align_bits, int flag)
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{
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RK_U32 word_offset = 0, len = 0;
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word_offset = (align_bits >= 64) ? ((bp->index & (((align_bits & 0xfe0) >> 6) - 1)) << 6) : 0;
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len = (align_bits - (word_offset + (bp->bitpos % align_bits))) % align_bits;
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while (len > 0) {
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if (len >= 8) {
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if (flag == 0)
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mpp_put_bits(bp, ((RK_U64)0 << (64 - 8)) >> (64 - 8), 8);
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else
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mpp_put_bits(bp, (0xffffffffffffffff << (64 - 8)) >> (64 - 8), 8);
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len -= 8;
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} else {
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if (flag == 0)
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mpp_put_bits(bp, ((RK_U64)0 << (64 - len)) >> (64 - len), len);
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else
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mpp_put_bits(bp, (0xffffffffffffffff << (64 - len)) >> (64 - len), len);
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len -= len;
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}
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}
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}
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