/******************************************************************************
*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
#include "iv_datatypedef.h"
#include "iv.h"
#include "impeg2_buf_mgr.h"
#include "impeg2_disp_mgr.h"
#include "impeg2_defs.h"
#include "impeg2_platform_macros.h"
#include "impeg2_inter_pred.h"
#include "impeg2_idct.h"
#include "impeg2_globals.h"
#include "impeg2_mem_func.h"
#include "impeg2_format_conv.h"
#include "impeg2_macros.h"
#include "ivd.h"
#include "impeg2d.h"
#include "impeg2d_bitstream.h"
#include "impeg2d_structs.h"
#include "impeg2d_vld_tables.h"
#include "impeg2d_vld.h"
#include "impeg2d_pic_proc.h"
#include "impeg2d_debug.h"
#include "impeg2d_globals.h"
#include "impeg2d_mv_dec.h"
/*******************************************************************************
* Function Name : impeg2d_dec_i_mb_params
*
* Description : Decoding I MB parameters.
*
* Arguments :
* dec : Decoder state
* stream : Bitstream
*
* Values Returned : None
*******************************************************************************/
void impeg2d_dec_i_mb_params(dec_state_t *ps_dec)
{
UWORD16 u2_next_bits;
UWORD16 u2_bits_to_flush;
stream_t *ps_stream = &ps_dec->s_bit_stream;
/*-----------------------------------------------------------------------*/
/* Flush the MBAddrIncr Bit */
/* */
/* Since we are not supporting scalable modes there won't be skipped */
/* macroblocks in I-Picture and the MBAddrIncr will always be 1, */
/* The MBAddrIncr can never be greater than 1 for the simple and main */
/* profile MPEG2. */
/*-----------------------------------------------------------------------*/
if(impeg2d_bit_stream_nxt(ps_stream,1) == 1) //Making sure the increment is one.
{
impeg2d_bit_stream_flush(ps_stream,1);
}
else if(ps_dec->u2_first_mb && ps_dec->u2_mb_x)
{
WORD32 i4_mb_add_inc = impeg2d_get_mb_addr_incr(ps_stream);
//VOLParams->FirstInSlice = 0;
/****************************************************************/
/* Section 6.3.17 */
/* The first MB of a slice cannot be skipped */
/* But the mb_addr_incr can be > 1, because at the beginning of */
/* a slice, it indicates the offset from the last MB in the */
/* previous row. Hence for the first slice in a row, the */
/* mb_addr_incr needs to be 1. */
/****************************************************************/
/* MB_x is set to zero whenever MB_y changes. */
ps_dec->u2_mb_x = i4_mb_add_inc - 1;
ps_dec->u2_mb_x = MIN(ps_dec->u2_mb_x, (ps_dec->u2_num_horiz_mb - 1));
}
/*-----------------------------------------------------------------------*/
/* Decode the macroblock_type, dct_type and quantiser_scale_code */
/* */
/* macroblock_type 2 bits [can be either 1 or 01] */
/* dct_type 1 bit */
/* quantiser_scale_code 5 bits */
/*-----------------------------------------------------------------------*/
u2_next_bits = impeg2d_bit_stream_nxt(ps_stream,8);
if(BIT(u2_next_bits,7) == 1)
{
/* read the dct_type if needed */
u2_bits_to_flush = 1;
if(ps_dec->u2_read_dct_type)
{
u2_bits_to_flush++;
ps_dec->u2_field_dct = BIT(u2_next_bits,6);
}
}
else
{
u2_bits_to_flush = 7;
/*------------------------------------------------------------------*/
/* read the dct_type if needed */
/*------------------------------------------------------------------*/
if(ps_dec->u2_read_dct_type)
{
u2_bits_to_flush++;
ps_dec->u2_field_dct = BIT(u2_next_bits,5);
}
else
{
u2_next_bits >>= 1;
}
/*------------------------------------------------------------------*/
/* Quant scale code decoding */
/*------------------------------------------------------------------*/
{
UWORD16 quant_scale_code;
quant_scale_code = u2_next_bits & 0x1F;
ps_dec->u1_quant_scale = (ps_dec->u2_q_scale_type) ?
gau1_impeg2_non_linear_quant_scale[quant_scale_code] :
(quant_scale_code << 1);
}
}
impeg2d_bit_stream_flush(ps_stream,u2_bits_to_flush);
/*************************************************************************/
/* Decoding of motion vectors if concealment motion vectors are present */
/*************************************************************************/
if(ps_dec->u2_concealment_motion_vectors)
{
if(ps_dec->u2_picture_structure != FRAME_PICTURE)
impeg2d_bit_stream_flush(ps_stream,1);
impeg2d_dec_mv(ps_stream,ps_dec->ai2_pred_mv[FORW][FIRST],ps_dec->ai2_mv[FORW][FIRST],
ps_dec->au2_f_code[FORW],0,0);
/* Flush the marker bit */
if(0 == (impeg2d_bit_stream_get(ps_stream,1)))
{
/* Ignore marker bit error */
}
}
ps_dec->u2_first_mb = 0;
return;
}
/*******************************************************************************
* Function Name : impeg2d_dec_i_slice
*
* Description : Decodes I slice
*
* Arguments :
* dec : Decoder state
*
* Values Returned : None
*******************************************************************************/
IMPEG2D_ERROR_CODES_T impeg2d_dec_i_slice(dec_state_t *ps_dec)
{
WORD16 *pi2_vld_out;
UWORD32 i;
yuv_buf_t *ps_cur_frm_buf = &ps_dec->s_cur_frm_buf;
UWORD32 u4_frame_width = ps_dec->u2_frame_width;
UWORD32 u4_frm_offset = 0;
UWORD8 *pu1_out_p;
IMPEG2D_ERROR_CODES_T e_error = (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;
pi2_vld_out = ps_dec->ai2_vld_buf;
if(ps_dec->u2_picture_structure != FRAME_PICTURE)
{
u4_frame_width <<= 1;
if(ps_dec->u2_picture_structure == BOTTOM_FIELD)
{
u4_frm_offset = ps_dec->u2_frame_width;
}
}
do
{
UWORD32 u4_x_offset,u4_y_offset;
UWORD32 u4_blk_pos;
UWORD32 u4_x_dst_offset = 0;
UWORD32 u4_y_dst_offset = 0;
IMPEG2D_TRACE_MB_START(ps_dec->u2_mb_x, ps_dec->u2_mb_y);
impeg2d_dec_i_mb_params(ps_dec);
u4_x_dst_offset = u4_frm_offset + (ps_dec->u2_mb_x << 4);
u4_y_dst_offset = (ps_dec->u2_mb_y << 4) * u4_frame_width;
pu1_out_p = ps_cur_frm_buf->pu1_y + u4_x_dst_offset + u4_y_dst_offset;
for(i = 0; i < NUM_LUMA_BLKS; ++i)
{
e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out,
ps_dec->pu1_inv_scan_matrix, 1, Y_LUMA, 0);
if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)
{
return e_error;
}
u4_x_offset = gai2_impeg2_blk_x_off[i];
if(ps_dec->u2_field_dct == 0)
u4_y_offset = gai2_impeg2_blk_y_off_frm[i] ;
else
u4_y_offset = gai2_impeg2_blk_y_off_fld[i] ;
u4_blk_pos = u4_y_offset * u4_frame_width + u4_x_offset;
IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);
PROFILE_DISABLE_IDCT_IF0
{
WORD32 i4_idx;
i4_idx = 1;
if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))
i4_idx = 0;
ps_dec->pf_idct_recon[i4_idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,
ps_dec->ai2_idct_stg1,
(UWORD8 *)gau1_impeg2_zerobuf,
pu1_out_p + u4_blk_pos,
8,
8,
u4_frame_width << ps_dec->u2_field_dct,
~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);
}
}
/* For U and V blocks, divide the x and y offsets by 2. */
u4_x_dst_offset >>= 1;
u4_y_dst_offset >>= 2;
/* In case of chrominance blocks the DCT will be frame DCT */
/* i = 0, U component and */
e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out,
ps_dec->pu1_inv_scan_matrix, 1, U_CHROMA, 0);
if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)
{
return e_error;
}
pu1_out_p = ps_cur_frm_buf->pu1_u + u4_x_dst_offset + u4_y_dst_offset;
IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);
PROFILE_DISABLE_IDCT_IF0
{
WORD32 i4_idx;
i4_idx = 1;
if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))
i4_idx = 0;
ps_dec->pf_idct_recon[i4_idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,
ps_dec->ai2_idct_stg1,
(UWORD8 *)gau1_impeg2_zerobuf,
pu1_out_p,
8,
8,
u4_frame_width >> 1,
~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);
}
/* Write the idct_out block to the current frame dec->curFrame*/
/* In case of field DCT type, write to alternate lines */
e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out,
ps_dec->pu1_inv_scan_matrix, 1, V_CHROMA, 0);
if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)
{
return e_error;
}
pu1_out_p = ps_cur_frm_buf->pu1_v + u4_x_dst_offset + u4_y_dst_offset;
IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);
PROFILE_DISABLE_IDCT_IF0
{
WORD32 i4_idx;
i4_idx = 1;
if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))
i4_idx = 0;
ps_dec->pf_idct_recon[i4_idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,
ps_dec->ai2_idct_stg1,
(UWORD8 *)gau1_impeg2_zerobuf,
pu1_out_p,
8,
8,
u4_frame_width >> 1,
~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);
}
ps_dec->u2_num_mbs_left--;
ps_dec->u2_mb_x++;
if(ps_dec->s_bit_stream.u4_offset > ps_dec->s_bit_stream.u4_max_offset)
{
return IMPEG2D_BITSTREAM_BUFF_EXCEEDED_ERR;
}
else if (ps_dec->u2_mb_x == ps_dec->u2_num_horiz_mb)
{
ps_dec->u2_mb_x = 0;
ps_dec->u2_mb_y++;
}
}
while(ps_dec->u2_num_mbs_left != 0 && impeg2d_bit_stream_nxt(&ps_dec->s_bit_stream,23) != 0x0);
return e_error;
}