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435 lines
15 KiB
435 lines
15 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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/**
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******************************************************************************
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* @file
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* ih264e_bitstream.c
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*
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* @brief
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* This file contains function definitions related to bitstream generation
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*
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* @author
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* ittiam
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*
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* @par List of Functions:
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* - ih264e_bitstrm_init()
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* - ih264e_put_bits()
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* - ih264e_put_bit()
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* - ih264e_put_rbsp_trailing_bits()
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* - ih264e_put_uev()
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* - ih264e_put_sev()
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* - ih264e_put_nal_start_code_prefix()
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*
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******************************************************************************
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*/
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/*****************************************************************************/
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/* File Includes */
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/*****************************************************************************/
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/* System include files */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <stdarg.h>
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#include <math.h>
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/* User include files */
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#include "ih264e_config.h"
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#include "ih264_typedefs.h"
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#include "ih264_platform_macros.h"
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#include "ih264_debug.h"
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#include "ih264e_error.h"
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#include "ih264e_bitstream.h"
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#include "ih264_defs.h"
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#include "ih264_macros.h"
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/*****************************************************************************/
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/* Function Definitions */
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/*****************************************************************************/
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/**
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******************************************************************************
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*
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* @brief Initializes the encoder bitstream engine
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*
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* @par Description
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* This routine needs to be called at start of slice/frame encode
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*
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* @param[in] ps_bitstrm
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* pointer to bitstream context (handle)
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*
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* @param[in] p1_bitstrm_buf
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* bitstream buffer pointer where the encoded stream is generated in byte order
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*
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* @param[in] u4_max_bitstrm_size
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* indicates maximum bitstream buffer size. (in bytes)
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* If actual stream size exceeds the maximum size, encoder should
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* 1. Not corrupt data beyond u4_max_bitstrm_size bytes
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* 2. Report an error back to application indicating overflow
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*
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* @return success or failure error code
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*
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******************************************************************************
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*/
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IH264E_ERROR_T ih264e_bitstrm_init(bitstrm_t *ps_bitstrm,
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UWORD8 *pu1_bitstrm_buf,
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UWORD32 u4_max_bitstrm_size)
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{
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ps_bitstrm->pu1_strm_buffer = pu1_bitstrm_buf;
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ps_bitstrm->u4_max_strm_size = u4_max_bitstrm_size;
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/* Default init values for other members of bitstream context */
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ps_bitstrm->u4_strm_buf_offset = 0;
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ps_bitstrm->u4_cur_word = 0;
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ps_bitstrm->i4_bits_left_in_cw = WORD_SIZE;
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ps_bitstrm->i4_zero_bytes_run = 0;
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return(IH264E_SUCCESS);
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}
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/**
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******************************************************************************
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*
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* @brief puts a code with specified number of bits into the bitstream
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*
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* @par Description
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* inserts code_len number of bits from lsb of code_val into the
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* bitstream. updates context members like u4_cur_word, u4_strm_buf_offset and
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* i4_bits_left_in_cw. If the total words (u4_strm_buf_offset) exceeds max
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* available size (u4_max_strm_size), returns error without corrupting data
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* beyond it
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*
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* @param[in] ps_bitstrm
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* pointer to bitstream context (handle)
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*
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* @param[in] u4_code_val
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* code value that needs to be inserted in the stream.
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*
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* @param[in] code_len
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* indicates code length (in bits) of code_val that would be inserted in
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* bitstream buffer size. Range of length[1:WORD_SIZE]
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*
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* @remarks Assumptions: all bits from bit position code_len to msb of
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* code_val shall be zero
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*
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* @return success or failure error code
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*
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******************************************************************************
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*/
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IH264E_ERROR_T ih264e_put_bits(bitstrm_t *ps_bitstrm,
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UWORD32 u4_code_val,
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WORD32 code_len)
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{
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UWORD32 u4_cur_word = ps_bitstrm->u4_cur_word;
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WORD32 bits_left_in_cw = ps_bitstrm->i4_bits_left_in_cw;
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/* check assumptions made in the module */
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ASSERT(code_len > 0 && code_len <= WORD_SIZE);
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if(code_len < WORD_SIZE)
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ASSERT((u4_code_val >> code_len) == 0);
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/* sanity check on the bitstream engine state */
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ASSERT(bits_left_in_cw > 0 && bits_left_in_cw <= WORD_SIZE);
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ASSERT(ps_bitstrm->i4_zero_bytes_run <= EPB_ZERO_BYTES);
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ASSERT(ps_bitstrm->pu1_strm_buffer != NULL);
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if(bits_left_in_cw > code_len)
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{
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/*******************************************************************/
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/* insert the code in local bitstream word and return */
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/* code is inserted in position of bits left (post decrement) */
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/*******************************************************************/
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bits_left_in_cw -= code_len;
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u4_cur_word |= (u4_code_val << bits_left_in_cw);
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ps_bitstrm->u4_cur_word = u4_cur_word;
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ps_bitstrm->i4_bits_left_in_cw = bits_left_in_cw;
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return(IH264E_SUCCESS);
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}
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else
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{
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/********************************************************************/
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/* 1. insert partial code corresponding to bits left in cur word */
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/* 2. flush all the bits of cur word to bitstream */
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/* 3. insert emulation prevention bytes while flushing the bits */
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/* 4. insert remaining bits of code starting from msb of cur word */
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/* 5. update bitsleft in current word and stream buffer offset */
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/********************************************************************/
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IH264E_ERROR_T status = IH264E_SUCCESS;
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WORD32 i, rem_bits = (code_len - bits_left_in_cw);
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/* insert parital code corresponding to bits left in cur word */
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u4_cur_word |= u4_code_val >> rem_bits;
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for(i = WORD_SIZE; i > 0; i -= 8)
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{
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/* flush the bits in cur word byte by byte and copy to stream */
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UWORD8 u1_next_byte = (u4_cur_word >> (i-8)) & 0xFF;
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status |= ih264e_put_byte_epb(ps_bitstrm, u1_next_byte);
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}
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/* insert the remaining bits from code val into current word */
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u4_cur_word = rem_bits ? (u4_code_val << (WORD_SIZE - rem_bits)) : 0;
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/* update the state variables and return success */
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ps_bitstrm->u4_cur_word = u4_cur_word;
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ps_bitstrm->i4_bits_left_in_cw = WORD_SIZE - rem_bits;
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return (status);
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}
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}
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/**
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******************************************************************************
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*
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* @brief inserts a 1-bit code into the bitstream
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*
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* @par Description
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* inserts 1bit lsb of code_val into the bitstream
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* updates context members like u4_cur_word, u4_strm_buf_offset and
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* i4_bits_left_in_cw. If the total words (u4_strm_buf_offset) exceeds max
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* available size (u4_max_strm_size), returns error without corrupting data
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* beyond it
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*
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* @param[in] ps_bitstrm
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* pointer to bitstream context (handle)
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*
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* @param[in] u4_code_val
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* code value that needs to be inserted in the stream.
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*
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* @remarks Assumptions: all bits from bit position 1 to msb of code_val
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* shall be zero
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*
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* @return success or failure error code
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*
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******************************************************************************
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*/
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IH264E_ERROR_T ih264e_put_bit(bitstrm_t *ps_bitstrm, UWORD32 u4_code_val)
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{
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/* call the put bits function for 1 bit and return */
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return(ih264e_put_bits(ps_bitstrm, u4_code_val, 1));
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}
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/**
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******************************************************************************
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*
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* @brief inserts rbsp trailing bits at the end of stream buffer (NAL)
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*
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* @par Description
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* inserts rbsp trailing bits, updates context members like u4_cur_word and
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* i4_bits_left_in_cw and flushes the same in the bitstream buffer. If the
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* total words (u4_strm_buf_offset) exceeds max available size
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* (u4_max_strm_size), returns error without corrupting data beyond it
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*
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* @param[in] ps_bitstrm
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* pointer to bitstream context (handle)
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*
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* @return success or failure error code
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*
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******************************************************************************
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*/
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IH264E_ERROR_T ih264e_put_rbsp_trailing_bits(bitstrm_t *ps_bitstrm)
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{
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WORD32 i;
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UWORD32 u4_cur_word = ps_bitstrm->u4_cur_word;
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WORD32 bits_left_in_cw = ps_bitstrm->i4_bits_left_in_cw;
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WORD32 bytes_left_in_cw = (bits_left_in_cw - 1) >> 3;
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IH264E_ERROR_T status = IH264E_SUCCESS;
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/* insert a 1 at the end of current word and flush all the bits */
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u4_cur_word |= (1 << (bits_left_in_cw - 1));
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/* get the bits to be inserted in msbdb of the word */
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//u4_cur_word <<= (WORD_SIZE - bytes_left_in_cw + 1);
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for(i = WORD_SIZE; i > (bytes_left_in_cw*8); i -= 8)
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{
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/* flush the bits in cur word byte by byte and copy to stream */
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UWORD8 u1_next_byte = (u4_cur_word >> (i-8)) & 0xFF;
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status |= ih264e_put_byte_epb(ps_bitstrm, u1_next_byte);
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}
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/* Default init values for scratch variables of bitstream context */
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ps_bitstrm->u4_cur_word = 0;
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ps_bitstrm->i4_bits_left_in_cw = WORD_SIZE;
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ps_bitstrm->i4_zero_bytes_run = 0;
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return (status);
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}
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/**
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******************************************************************************
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*
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* @brief puts exponential golomb code of a unsigned integer into bitstream
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*
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* @par Description
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* computes uev code for given syntax element and inserts the same into
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* bitstream by calling ih264e_put_bits() interface.
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*
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* @param[in] ps_bitstrm
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* pointer to bitstream context (handle)
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*
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* @param[in] u4_code_num
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* unsigned integer input whose golomb code is written in stream
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*
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* @remarks Assumptions: code value can be represented in less than 16bits
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*
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* @return success or failure error code
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*
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******************************************************************************
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*/
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IH264E_ERROR_T ih264e_put_uev(bitstrm_t *ps_bitstrm, UWORD32 u4_code_num)
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{
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UWORD32 u4_bit_str, u4_range;
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IH264E_ERROR_T e_error;
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/* convert the codenum to exp-golomb bit code: Table 9-2 JCTVC-J1003_d7 */
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u4_bit_str = u4_code_num + 1;
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/* get range of the bit string and put using put_bits() */
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GETRANGE(u4_range, u4_bit_str);
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e_error = ih264e_put_bits(ps_bitstrm, u4_bit_str, (2 * u4_range - 1));
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return(e_error);
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}
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/**
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******************************************************************************
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*
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* @brief puts exponential golomb code of a signed integer into bitstream
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*
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* @par Description
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* computes sev code for given syntax element and inserts the same into
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* bitstream by calling ih264e_put_bits() interface.
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*
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* @param[in] ps_bitstrm
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* pointer to bitstream context (handle)
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*
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* @param[in] syntax_elem
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* signed integer input whose golomb code is written in stream
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*
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* @remarks Assumptions: code value can be represented in less than 16bits
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*
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* @return success or failure error code
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*
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******************************************************************************
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*/
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IH264E_ERROR_T ih264e_put_sev(bitstrm_t *ps_bitstrm, WORD32 syntax_elem)
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{
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UWORD32 u4_code_num, u4_bit_str, u4_range;
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IH264E_ERROR_T e_error;
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/************************************************************************/
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/* convert the codenum to exp-golomb bit code for signed syntax element */
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/* See Table9-2 and Table 9-3 of standard JCTVC-J1003_d7 */
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/************************************************************************/
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if(syntax_elem <= 0)
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{
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/* codeNum for non-positive integer = 2*abs(x) : Table9-3 */
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u4_code_num = ((-syntax_elem) << 1);
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}
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else
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{
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/* codeNum for positive integer = 2x-1 : Table9-3 */
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u4_code_num = (syntax_elem << 1) - 1;
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}
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/* convert the codenum to exp-golomb bit code: Table 9-2 JCTVC-J1003_d7 */
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u4_bit_str = u4_code_num + 1;
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/* get range of the bit string and put using put_bits() */
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GETRANGE(u4_range, u4_bit_str);
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e_error = ih264e_put_bits(ps_bitstrm, u4_bit_str, (2 * u4_range - 1));
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return(e_error);
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}
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/**
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******************************************************************************
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*
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* @brief insert NAL start code prefix (0x000001) into bitstream with an option
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* of inserting leading_zero_8bits (which makes startcode prefix as 0x00000001)
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*
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* @par Description
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* Although start code prefix could have been put by calling ih264e_put_bits(),
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* ih264e_put_nal_start_code_prefix() is specially added to make sure emulation
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* prevention insertion is not done for the NAL start code prefix which will
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* surely happen otherwise by calling ih264e_put_bits() interface.
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*
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* @param[in] ps_bitstrm
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* pointer to bitstream context (handle)
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*
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* @param[in] insert_leading_zero_8bits
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* flag indicating if one more zero bytes needs to prefixed before start code
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*
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* @return success or failure error code
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*
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******************************************************************************
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*/
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IH264E_ERROR_T ih264e_put_nal_start_code_prefix(bitstrm_t *ps_bitstrm,
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WORD32 insert_leading_zero_8bits)
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{
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UWORD32 u4_strm_buf_offset = ps_bitstrm->u4_strm_buf_offset;
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UWORD8* pu1_strm_buf = ps_bitstrm->pu1_strm_buffer;
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/* Bitstream buffer overflow check assuming worst case of 4 bytes */
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if((u4_strm_buf_offset + 4) >= ps_bitstrm->u4_max_strm_size)
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{
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return(IH264E_BITSTREAM_BUFFER_OVERFLOW);
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}
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/* Insert leading zero 8 bits conditionally */
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if(insert_leading_zero_8bits)
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{
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pu1_strm_buf[u4_strm_buf_offset] = 0x00;
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u4_strm_buf_offset++;
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}
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/* Insert NAL start code prefix 0x00 00 01 */
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pu1_strm_buf[u4_strm_buf_offset] = 0x00;
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u4_strm_buf_offset++;
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pu1_strm_buf[u4_strm_buf_offset] = 0x00;
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u4_strm_buf_offset++;
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pu1_strm_buf[u4_strm_buf_offset] = 0x01;
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u4_strm_buf_offset++;
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/* update the stream offset */
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ps_bitstrm->u4_strm_buf_offset = u4_strm_buf_offset;
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return (IH264E_SUCCESS);
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}
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