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471 lines
16 KiB
471 lines
16 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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UWORD32 u4_strm_buf_offset = ps_bitstrm->u4_strm_buf_offset; |
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UWORD32 u4_max_strm_size = ps_bitstrm->u4_max_strm_size; |
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WORD32 zero_run = ps_bitstrm->i4_zero_bytes_run; |
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UWORD8* pu1_strm_buf = ps_bitstrm->pu1_strm_buffer; |
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WORD32 i, rem_bits = (code_len - bits_left_in_cw); |
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/*********************************************************************/ |
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/* Bitstream overflow check */ |
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/* NOTE: corner case of epb bytes (max 2 for 32bit word) not handled */ |
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/*********************************************************************/ |
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if((u4_strm_buf_offset + (WORD_SIZE>>3)) >= u4_max_strm_size) |
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{ |
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/* return without corrupting the buffer beyond its size */ |
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return(IH264E_BITSTREAM_BUFFER_OVERFLOW); |
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} |
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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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PUTBYTE_EPB(pu1_strm_buf, u4_strm_buf_offset, u1_next_byte, zero_run); |
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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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ps_bitstrm->i4_zero_bytes_run = zero_run; |
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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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} |
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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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UWORD32 u4_strm_buf_offset = ps_bitstrm->u4_strm_buf_offset; |
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UWORD32 u4_max_strm_size = ps_bitstrm->u4_max_strm_size; |
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WORD32 zero_run = ps_bitstrm->i4_zero_bytes_run; |
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UWORD8* pu1_strm_buf = ps_bitstrm->pu1_strm_buffer; |
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/*********************************************************************/ |
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/* Bitstream overflow check */ |
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/* NOTE: corner case of epb bytes (max 2 for 32bit word) not handled */ |
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/*********************************************************************/ |
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if((u4_strm_buf_offset + (WORD_SIZE>>3) - bytes_left_in_cw) >= |
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u4_max_strm_size) |
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{ |
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/* return without corrupting the buffer beyond its size */ |
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return(IH264E_BITSTREAM_BUFFER_OVERFLOW); |
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} |
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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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PUTBYTE_EPB(pu1_strm_buf, u4_strm_buf_offset, u1_next_byte, zero_run); |
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} |
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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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/* 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 (IH264E_SUCCESS); |
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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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