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199 lines
9.5 KiB
199 lines
9.5 KiB
/******************************************************************************
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*
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* Copyright (C) 2015 The Android Open Source Project
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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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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#ifndef _IH264D_BITSTRM_H_
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#define _IH264D_BITSTRM_H_
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/*!
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*************************************************************************
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* \file ih264d_bitstrm.h
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*
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* \brief
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* Contains all the declarations of bitstream reading routines
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*
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* \date
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* 20/11/2002
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*
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* \author AI
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*************************************************************************
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*/
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/* Includes */
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#include <stdio.h>
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#include <stdlib.h>
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#include "ih264_typedefs.h"
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#include "ih264_macros.h"
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#include "ih264_platform_macros.h"
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#define INT_IN_BYTES 4
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#define INT_IN_BITS 32
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/* Based on level 1.2 of baseline profile */
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/* 396[MAX_FS] * 128 * 1.5 [ChromaFormatParameter] / sizeof(UWORD32)
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i.e 396 * 128 * 1.5 / 4 = 19008 */
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/* Based on level 3 of main profile */
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/* 1620[MAX_FS] * 128 * 1.5 [ChromaFormatParameter] / sizeof(UWORD32)
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i.e 1620 * 128 * 1.5 / 4= 77760 */
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#define SIZE_OF_BUFFER 77760
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/* Structure for the ps_bitstrm */
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typedef struct
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{
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UWORD32 u4_ofst; /* Offset in the buffer for the current bit */
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UWORD32 *pu4_buffer; /* Bitstream Buffer */
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UWORD32 u4_max_ofst; /* points to first bit beyond the buffer */
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void * pv_codec_handle; /* For Error Handling */
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} dec_bit_stream_t;
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/* To read the next bit */
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UWORD8 ih264d_get_bit_h264(dec_bit_stream_t *);
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/* To read the next specified number of bits */
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UWORD32 ih264d_get_bits_h264(dec_bit_stream_t *, UWORD32);
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/* To see the next specified number of bits */
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UWORD32 ih264d_next_bits_h264(dec_bit_stream_t *, UWORD32);
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/* To flush a specified number of bits*/
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WORD32 ih264d_flush_bits_h264(dec_bit_stream_t *, WORD32);
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/*!
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**************************************************************************
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* \if Function name : MoreRbspData \endif
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*
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* \brief
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* Determines whether there is more data in RBSP or not.
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*
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* \param ps_bitstrm : Pointer to bitstream
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*
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* \return
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* Returns 1 if there is more data in RBSP before rbsp_trailing_bits().
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* Otherwise it returns FALSE.
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**************************************************************************
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*/
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#define EXCEED_OFFSET(ps_bitstrm) \
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(ps_bitstrm->u4_ofst > ps_bitstrm->u4_max_ofst)
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#define CHECK_BITS_SUFFICIENT(ps_bitstrm, bits_to_read) \
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(ps_bitstrm->u4_ofst + bits_to_read <= ps_bitstrm->u4_max_ofst)
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#define MORE_RBSP_DATA(ps_bitstrm) \
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CHECK_BITS_SUFFICIENT(ps_bitstrm, 1)
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void GoToByteBoundary(dec_bit_stream_t * ps_bitstrm);
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UWORD8 ih264d_check_byte_aligned(dec_bit_stream_t * ps_bitstrm);
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/*****************************************************************************/
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/* Define a macro for inlining of GETBIT: */
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/*****************************************************************************/
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#define GETBIT(u4_code, u4_offset, pu4_bitstream) \
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{ \
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UWORD32 *pu4_buf = (pu4_bitstream); \
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UWORD32 u4_word_off = ((u4_offset) >> 5); \
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UWORD32 u4_bit_off = (u4_offset) & 0x1F; \
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u4_code = pu4_buf[u4_word_off] << u4_bit_off; \
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(u4_offset)++; \
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u4_code = (u4_code >> 31); \
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}
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/*****************************************************************************/
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/* Define a macro for inlining of GETBITS: u4_no_bits shall not exceed 32 */
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/*****************************************************************************/
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#define GETBITS(u4_code, u4_offset, pu4_bitstream, u4_no_bits) \
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{ \
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UWORD32 *pu4_buf = (pu4_bitstream); \
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UWORD32 u4_word_off = ((u4_offset) >> 5); \
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UWORD32 u4_bit_off = (u4_offset) & 0x1F; \
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u4_code = pu4_buf[u4_word_off++] << u4_bit_off; \
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\
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if(u4_bit_off) \
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u4_code |= (pu4_buf[u4_word_off] >> (INT_IN_BITS - u4_bit_off)); \
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u4_code = u4_code >> (INT_IN_BITS - u4_no_bits); \
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(u4_offset) += u4_no_bits; \
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} \
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\
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/*****************************************************************************/
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/* Define a macro for inlining of NEXTBITS */
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/*****************************************************************************/
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#define NEXTBITS(u4_word, u4_offset, pu4_bitstream, u4_no_bits) \
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{ \
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UWORD32 *pu4_buf = (pu4_bitstream); \
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UWORD32 u4_word_off = ((u4_offset) >> 5); \
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UWORD32 u4_bit_off = (u4_offset) & 0x1F; \
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u4_word = pu4_buf[u4_word_off++] << u4_bit_off; \
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if(u4_bit_off) \
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u4_word |= (pu4_buf[u4_word_off] >> (INT_IN_BITS - u4_bit_off)); \
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u4_word = u4_word >> (INT_IN_BITS - u4_no_bits); \
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}
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/*****************************************************************************/
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/* Define a macro for inlining of NEXTBITS_32 */
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/*****************************************************************************/
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#define NEXTBITS_32(u4_word, u4_offset, pu4_bitstream) \
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{ \
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UWORD32 *pu4_buf = (pu4_bitstream); \
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UWORD32 u4_word_off = ((u4_offset) >> 5); \
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UWORD32 u4_bit_off = (u4_offset) & 0x1F; \
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\
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u4_word = pu4_buf[u4_word_off++] << u4_bit_off; \
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if(u4_bit_off) \
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u4_word |= (pu4_buf[u4_word_off] >> (INT_IN_BITS - u4_bit_off)); \
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}
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/*****************************************************************************/
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/* Define a macro for inlining of FIND_ONE_IN_STREAM_32 */
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/*****************************************************************************/
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#define FIND_ONE_IN_STREAM_32(u4_ldz, u4_offset, pu4_bitstream) \
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{ \
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UWORD32 u4_word; \
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NEXTBITS_32(u4_word, u4_offset, pu4_bitstream); \
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u4_ldz = CLZ(u4_word); \
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(u4_offset) += (u4_ldz + 1); \
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}
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/*****************************************************************************/
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/* Define a macro for inlining of FIND_ONE_IN_STREAM_LEN */
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/*****************************************************************************/
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#define FIND_ONE_IN_STREAM_LEN(u4_ldz, u4_offset, pu4_bitstream, u4_len) \
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{ \
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UWORD32 u4_word; \
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NEXTBITS_32(u4_word, u4_offset, pu4_bitstream); \
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u4_ldz = CLZ(u4_word); \
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if(u4_ldz < u4_len) \
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(u4_offset) += (u4_ldz + 1); \
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else \
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{ \
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u4_ldz = u4_len; \
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(u4_offset) += u4_ldz; \
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} \
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}
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/*****************************************************************************/
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/* Define a macro for inlining of FLUSHBITS */
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/*****************************************************************************/
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#define FLUSHBITS(u4_offset, u4_no_bits) \
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{ \
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(u4_offset) += (u4_no_bits); \
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}
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#endif /* _BITSTREAM_H_ */
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