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157 lines
8.9 KiB
157 lines
8.9 KiB
4 months ago
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/******************************************************************************
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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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/*****************************************************************************/
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/* */
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/* File Name : impeg2d_bitstream.h */
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/* */
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/* Description : This file contains all the necessary examples to */
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/* establish a consistent use of Ittiam C coding */
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/* standards (based on Indian Hill C Standards) */
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/* */
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/* List of Functions : <List the functions defined in this file> */
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/* */
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/* Issues / Problems : None */
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/* */
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/* Revision History : */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 10 01 2005 Ittiam Draft */
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/* */
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/*****************************************************************************/
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#ifndef __IMPEG2D_BITSTREAM_H__
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#define __IMPEG2D_BITSTREAM_H__
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/* Structure for the stream */
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typedef struct _stream_t
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{
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void *pv_bs_buf; /* Pointer to buffer containing the
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bitstream */
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UWORD32 *pu4_buf_aligned; /* Pointer to the buffer after alignment correction,
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It points to the currently usable buffer */
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UWORD32 u4_offset; /* Offset in the buffer for the current bit */
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UWORD32 u4_buf; /* Buffer storing the current word */
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UWORD32 u4_buf_nxt; /* Buffer storing the next Word */
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UWORD32 u4_max_offset; /* Max Bit stream buffer offset in bytes for error checks */
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} stream_t;
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#define GET_MARKER_BIT(dec,stream) \
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{ \
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if (impeg2d_bit_stream_get(stream,1) != 0x1) { \
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/* No need to return error if marker is not present. */ \
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} \
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}
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/* Define A macro for inlining of FlushBits */
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#define FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,u4_no_bits,pu4_buf_aligned) \
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{ \
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UWORD32 u4_temp; \
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\
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if (((u4_offset & 0x1f) + u4_no_bits)>= 32) \
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{ \
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u4_buf = u4_buf_nxt; \
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\
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u4_temp = *(pu4_buf_aligned)++; \
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\
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CONV_LE_TO_BE(u4_buf_nxt,u4_temp) \
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} \
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u4_offset += u4_no_bits; \
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}
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/* Macro to initialize the variables from stream */
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#define GET_TEMP_STREAM_DATA(u4_buf,u4_buf_nxt,u4_offset,pu4_buf_aligned,stream) \
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{ \
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u4_buf = stream->u4_buf; \
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u4_buf_nxt = stream->u4_buf_nxt; \
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u4_offset = stream->u4_offset; \
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pu4_buf_aligned = stream->pu4_buf_aligned; \
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}
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/* Macro to put the stream variable values back */
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#define PUT_TEMP_STREAM_DATA(u4_buf,u4_buf_nxt,u4_offset,pu4_buf_aligned,stream) \
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{ \
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stream->u4_buf = u4_buf; \
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stream->u4_buf_nxt = u4_buf_nxt; \
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stream->u4_offset = u4_offset; \
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stream->pu4_buf_aligned = pu4_buf_aligned; \
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}
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/* Macro to implement the get bits inline (ibits_nxt_inline) */
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#define IBITS_NXT(u4_buf, u4_buf_nxt, u4_offset, u4_bits, no_of_bits) \
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{ \
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UWORD8 u4_bit_ptr; \
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UWORD32 u4_temp; \
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\
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u4_bit_ptr = u4_offset & 0x1F; \
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u4_bits = u4_buf << u4_bit_ptr; \
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\
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u4_bit_ptr += no_of_bits; \
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\
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if(32 < u4_bit_ptr) \
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{ \
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/* Read bits from the next word if necessary */ \
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u4_temp = u4_buf_nxt; \
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u4_bit_ptr &= (BITS_IN_INT - 1); \
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\
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u4_temp = (u4_temp >> (BITS_IN_INT - u4_bit_ptr)); \
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\
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/* u4_temp consists of bits,if any that had to be read from the next word*/ \
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/* of the buffer.The bits read from both the words are concatenated and*/ \
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/* moved to the least significant positions of 'u4_bits'*/ \
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u4_bits = (u4_bits >> (32 - no_of_bits)) | u4_temp; \
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} \
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else \
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{ \
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u4_bits = (u4_bits >> (32 - no_of_bits)); \
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} \
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}
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/* Macro to implement the get bits inline (ibits_get_inline) */
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#define IBITS_GET(u4_buf,u4_buf_nxt,u4_offset,u4_bits,pu4_buf_aligned,no_of_bits) \
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{ \
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IBITS_NXT(u4_buf, u4_buf_nxt, u4_offset, u4_bits, no_of_bits) \
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FLUSH_BITS(u4_offset,u4_buf,u4_buf_nxt,no_of_bits,pu4_buf_aligned) \
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}
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void impeg2d_bit_stream_init(stream_t *stream,
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UWORD8 *byteBuf,
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UWORD32 u4_max_offset);
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INLINE UWORD8 impeg2d_bit_stream_get_bit(stream_t *stream);
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INLINE void impeg2d_bit_stream_flush(void* ctxt, UWORD32 NoOfBits);
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INLINE void impeg2d_bit_stream_flush_to_byte_boundary(void* ctxt);
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INLINE UWORD32 impeg2d_bit_stream_nxt(stream_t *stream, WORD32 NoOfBits);
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INLINE UWORD32 impeg2d_bit_stream_get(void* ctxt, UWORD32 numBits);
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INLINE UWORD32 impeg2d_bit_stream_num_bits_read(void* ctxt);
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#endif /* __IMPEG2D_BITSTREAM_H__ */
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