/src/libmpeg2/decoder/impeg2d_d_pic.c

Source
/******************************************************************************
 *
 * 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 <string.h>
#include "iv_datatypedef.h"
#include "impeg2_defs.h"
#include "impeg2_globals.h"
#include "impeg2_platform_macros.h"
#include "impeg2_inter_pred.h"
#include "impeg2_idct.h"
#include "impeg2_format_conv.h"
#include "impeg2_disp_mgr.h"
#include "impeg2_buf_mgr.h"

#include "impeg2d.h"
#include "impeg2d_bitstream.h"
#include "impeg2d_structs.h"
#include "impeg2d_vld.h"
#include "impeg2d_vld_tables.h"

#define BLK_SIZE 8
#define LUMA_BLK_SIZE (2 * (BLK_SIZE))
#define CHROMA_BLK_SIZE (BLK_SIZE)
/*****************************************************************************/
/*                                                                           */
/*  Function Name : impeg2d_get_luma_dc_diff                                         */
/*                                                                           */
/*  Description   : Decode the DC differential value from the bitstream for  */
/*                  luma block                                               */
/*                                                                           */
/*  Inputs        : stream - Input stream                                    */
/*                                                                           */
/*  Globals       : None                                                     */
/*                                                                           */
/*  Processing    : Decode the vlc for dc_diff                               */
/*                                                                           */
/*  Outputs       : dc_diff - dc differential used in dc prediction          */
/*                                                                           */
/*  Returns       : dc_diff - dc differential used in dc prediction          */
/*                                                                           */
/*  Issues        : None                                                     */
/*                                                                           */
/*  Revision History:                                                        */
/*                                                                           */
/*         DD MM YYYY   Author(s)       Changes                              */
/*         14 09 2005   Harish M        First Version                        */
/*                                                                           */
/*****************************************************************************/
WORD16  impeg2d_get_luma_dc_diff(stream_t *ps_stream)
{
    UWORD16 u2_dc_size;
    WORD16  i2_dc_diff;

    u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[0],
                        MPEG2_DCT_DC_LUMA_SIZE_LEN) +
                        MPEG2_DCT_DC_SIZE_OFFSET;
    if (u2_dc_size != 0)
    {
        i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
        if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
            i2_dc_diff -= (1 << u2_dc_size) - 1;
    }
    else
    {
        i2_dc_diff = 0;
    }
    return i2_dc_diff;
}

/*****************************************************************************/
/*                                                                           */
/*  Function Name : impeg2d_get_chroma_dc_diff                                       */
/*                                                                           */
/*  Description   : Decode the DC differential value from the bitstream for  */
/*                  chroma block                                             */
/*                                                                           */
/*  Inputs        : stream - Input stream                                    */
/*                                                                           */
/*  Globals       : None                                                     */
/*                                                                           */
/*  Processing    : Decode the vlc for dc_diff                               */
/*                                                                           */
/*  Outputs       : dc_diff - dc differential used in dc prediction          */
/*                                                                           */
/*  Returns       : dc_diff - dc differential used in dc prediction          */
/*                                                                           */
/*  Issues        : None                                                     */
/*                                                                           */
/*  Revision History:                                                        */
/*                                                                           */
/*         DD MM YYYY   Author(s)       Changes                              */
/*         14 09 2005   Harish M        First Version                        */
/*                                                                           */
/*****************************************************************************/
WORD16  impeg2d_get_chroma_dc_diff(stream_t *ps_stream)
{
    UWORD16 u2_dc_size;
    WORD16  i2_dc_diff;
    u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[1],
                        MPEG2_DCT_DC_CHROMA_SIZE_LEN) +
                        MPEG2_DCT_DC_SIZE_OFFSET;
    if (u2_dc_size != 0)
    {
        i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
        if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
            i2_dc_diff -= (1 << u2_dc_size) - 1;
    }
    else
    {
        i2_dc_diff = 0;
    }
    return i2_dc_diff;
}
/*******************************************************************************
*  Function Name   : impeg2d_dec_d_slice
*
*  Description     : Decodes I slice
*
*  Arguments       :
*  dec             : Decoder state
*
*  Values Returned : None
*******************************************************************************/
IMPEG2D_ERROR_CODES_T impeg2d_dec_d_slice(dec_state_t *ps_dec)
{
    UWORD32 i;
    yuv_buf_t *ps_cur_frm_buf  = &ps_dec->s_cur_frm_buf;

    stream_t   *ps_stream       = &ps_dec->s_bit_stream;
    UWORD8   *pu1_vld_buf;

    WORD16 i2_dc_diff;
    WORD32 row;
    UWORD32 u4_frame_width = ps_dec->u2_frame_width;
    UWORD32 u4_frm_offset = 0;
    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;
        WORD16 i2_dc_val;

        UWORD32 u4_dst_x_offset     = u4_frm_offset + (ps_dec->u2_mb_x << 4);
        UWORD32 u4_dst_y_offset     = (ps_dec->u2_mb_y << 4) * u4_frame_width;
        UWORD8 *pu1_vld_buf8        = ps_cur_frm_buf->pu1_y + u4_dst_x_offset + u4_dst_y_offset;
        UWORD32 u4_dst_wd           = u4_frame_width;
        /*------------------------------------------------------------------*/
        /* Discard the Macroblock stuffing in case of MPEG-1 stream         */
        /*------------------------------------------------------------------*/
        while(impeg2d_bit_stream_nxt(ps_stream,MB_STUFFING_CODE_LEN) == MB_STUFFING_CODE &&
                ps_stream->u4_offset < ps_stream->u4_max_offset)
            impeg2d_bit_stream_flush(ps_stream,MB_STUFFING_CODE_LEN);

        /*------------------------------------------------------------------*/
        /* Flush 2 bits from bitstream [MB_Type and MacroBlockAddrIncrement]*/
        /*------------------------------------------------------------------*/
        impeg2d_bit_stream_flush(ps_stream,1);

        if(impeg2d_bit_stream_get(ps_stream, 1) != 0x01)
        {
            /* Ignore and continue decoding. */
        }

        /* Process LUMA blocks of the MB */
        for(i = 0; i < NUM_LUMA_BLKS; ++i)
        {

            u4_x_offset    = gai2_impeg2_blk_x_off[i];
            u4_y_offset    = gai2_impeg2_blk_y_off_frm[i] ;
            u4_blk_pos     = (u4_y_offset * u4_dst_wd) + u4_x_offset;
            pu1_vld_buf     = pu1_vld_buf8 + u4_blk_pos;

            i2_dc_diff = impeg2d_get_luma_dc_diff(ps_stream);
            i2_dc_val = ps_dec->u2_def_dc_pred[Y_LUMA] + i2_dc_diff;
            ps_dec->u2_def_dc_pred[Y_LUMA] = i2_dc_val;
            i2_dc_val = CLIP_U8(i2_dc_val);

            for(row = BLK_SIZE; row > 0; row--)
            {
                memset(pu1_vld_buf, i2_dc_val, BLK_SIZE);
                pu1_vld_buf += u4_dst_wd;
            }
        }



        /* Process U block of the MB */

        u4_dst_x_offset                >>= 1;
        u4_dst_y_offset                >>= 2;
        u4_dst_wd                      >>= 1;
        pu1_vld_buf                     = ps_cur_frm_buf->pu1_u + u4_dst_x_offset + u4_dst_y_offset;
        i2_dc_diff                     = impeg2d_get_chroma_dc_diff(ps_stream);
        i2_dc_val                      = ps_dec->u2_def_dc_pred[U_CHROMA] + i2_dc_diff;
        ps_dec->u2_def_dc_pred[U_CHROMA]    = i2_dc_val;
        i2_dc_val = CLIP_U8(i2_dc_val);
        for(row = BLK_SIZE; row > 0; row--)
        {
            memset(pu1_vld_buf, i2_dc_val, BLK_SIZE);
            pu1_vld_buf += u4_dst_wd;
        }


        /* Process V block of the MB */

        pu1_vld_buf                     = ps_cur_frm_buf->pu1_v + u4_dst_x_offset + u4_dst_y_offset;
        i2_dc_diff                     = impeg2d_get_chroma_dc_diff(ps_stream);
        i2_dc_val                      = ps_dec->u2_def_dc_pred[V_CHROMA] + i2_dc_diff;
        ps_dec->u2_def_dc_pred[V_CHROMA]    = i2_dc_val;
        i2_dc_val = CLIP_U8(i2_dc_val);
        for(row = BLK_SIZE; row > 0; row--)
        {
            memset(pu1_vld_buf, i2_dc_val, BLK_SIZE);
            pu1_vld_buf += u4_dst_wd;
        }

        /* Common MB processing Steps */


        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++;

        }

        /* Flush end of macro block */
        impeg2d_bit_stream_flush(ps_stream,1);
    }
    while(ps_dec->u2_num_mbs_left != 0 && impeg2d_bit_stream_nxt(&ps_dec->s_bit_stream,23) != 0x0);
    return (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;
}/* End of impeg2d_dec_d_slice() */

Coverage Report

Created: 2026-10-28 06:50

Line	Count	Source
1		/******************************************************************************
2		*
3		* Copyright (C) 2015 The Android Open Source Project
4		*
5		* Licensed under the Apache License, Version 2.0 (the "License");
6		* you may not use this file except in compliance with the License.
7		* You may obtain a copy of the License at:
8		*
9		* http://www.apache.org/licenses/LICENSE-2.0
10		*
11		* Unless required by applicable law or agreed to in writing, software
12		* distributed under the License is distributed on an "AS IS" BASIS,
13		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14		* See the License for the specific language governing permissions and
15		* limitations under the License.
16		*
17		*****************************************************************************
18		* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
19		*/
20		#include <string.h>
21		#include "iv_datatypedef.h"
22		#include "impeg2_defs.h"
23		#include "impeg2_globals.h"
24		#include "impeg2_platform_macros.h"
25		#include "impeg2_inter_pred.h"
26		#include "impeg2_idct.h"
27		#include "impeg2_format_conv.h"
28		#include "impeg2_disp_mgr.h"
29		#include "impeg2_buf_mgr.h"
30
31		#include "impeg2d.h"
32		#include "impeg2d_bitstream.h"
33		#include "impeg2d_structs.h"
34		#include "impeg2d_vld.h"
35		#include "impeg2d_vld_tables.h"
36
37	4.35G	#define BLK_SIZE 8
38		#define LUMA_BLK_SIZE (2 * (BLK_SIZE))
39		#define CHROMA_BLK_SIZE (BLK_SIZE)
40		/*****************************************************************************/
41		/* */
42		/* Function Name : impeg2d_get_luma_dc_diff */
43		/* */
44		/* Description : Decode the DC differential value from the bitstream for */
45		/* luma block */
46		/* */
47		/* Inputs : stream - Input stream */
48		/* */
49		/* Globals : None */
50		/* */
51		/* Processing : Decode the vlc for dc_diff */
52		/* */
53		/* Outputs : dc_diff - dc differential used in dc prediction */
54		/* */
55		/* Returns : dc_diff - dc differential used in dc prediction */
56		/* */
57		/* Issues : None */
58		/* */
59		/* Revision History: */
60		/* */
61		/* DD MM YYYY Author(s) Changes */
62		/* 14 09 2005 Harish M First Version */
63		/* */
64		/*****************************************************************************/
65		WORD16 impeg2d_get_luma_dc_diff(stream_t *ps_stream)
66	322M	{
67	322M	UWORD16 u2_dc_size;
68	322M	WORD16 i2_dc_diff;
69
70	322M	u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[0],
71	322M	MPEG2_DCT_DC_LUMA_SIZE_LEN) +
72	322M	MPEG2_DCT_DC_SIZE_OFFSET;
73	322M	if (u2_dc_size != 0)
74	291M	{
75	291M	i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
76	291M	if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
77	225M	i2_dc_diff -= (1 << u2_dc_size) - 1;
78	291M	}
79	30.6M	else
80	30.6M	{
81	30.6M	i2_dc_diff = 0;
82	30.6M	}
83	322M	return i2_dc_diff;
84	322M	}
85
86		/*****************************************************************************/
87		/* */
88		/* Function Name : impeg2d_get_chroma_dc_diff */
89		/* */
90		/* Description : Decode the DC differential value from the bitstream for */
91		/* chroma block */
92		/* */
93		/* Inputs : stream - Input stream */
94		/* */
95		/* Globals : None */
96		/* */
97		/* Processing : Decode the vlc for dc_diff */
98		/* */
99		/* Outputs : dc_diff - dc differential used in dc prediction */
100		/* */
101		/* Returns : dc_diff - dc differential used in dc prediction */
102		/* */
103		/* Issues : None */
104		/* */
105		/* Revision History: */
106		/* */
107		/* DD MM YYYY Author(s) Changes */
108		/* 14 09 2005 Harish M First Version */
109		/* */
110		/*****************************************************************************/
111		WORD16 impeg2d_get_chroma_dc_diff(stream_t *ps_stream)
112	161M	{
113	161M	UWORD16 u2_dc_size;
114	161M	WORD16 i2_dc_diff;
115	161M	u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[1],
116	161M	MPEG2_DCT_DC_CHROMA_SIZE_LEN) +
117	161M	MPEG2_DCT_DC_SIZE_OFFSET;
118	161M	if (u2_dc_size != 0)
119	75.3M	{
120	75.3M	i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
121	75.3M	if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
122	43.9M	i2_dc_diff -= (1 << u2_dc_size) - 1;
123	75.3M	}
124	85.7M	else
125	85.7M	{
126	85.7M	i2_dc_diff = 0;
127	85.7M	}
128	161M	return i2_dc_diff;
129	161M	}
130		/*******************************************************************************
131		* Function Name : impeg2d_dec_d_slice
132		*
133		* Description : Decodes I slice
134		*
135		* Arguments :
136		* dec : Decoder state
137		*
138		* Values Returned : None
139		*******************************************************************************/
140		IMPEG2D_ERROR_CODES_T impeg2d_dec_d_slice(dec_state_t *ps_dec)
141	7.58M	{
142	7.58M	UWORD32 i;
143	7.58M	yuv_buf_t *ps_cur_frm_buf = &ps_dec->s_cur_frm_buf;
144
145	7.58M	stream_t *ps_stream = &ps_dec->s_bit_stream;
146	7.58M	UWORD8 *pu1_vld_buf;
147
148	7.58M	WORD16 i2_dc_diff;
149	7.58M	WORD32 row;
150	7.58M	UWORD32 u4_frame_width = ps_dec->u2_frame_width;
151	7.58M	UWORD32 u4_frm_offset = 0;
152	7.58M	if(ps_dec->u2_picture_structure != FRAME_PICTURE)
153	2.58k	{
154	2.58k	u4_frame_width <<= 1;
155	2.58k	if(ps_dec->u2_picture_structure == BOTTOM_FIELD)
156	2.35k	{
157	2.35k	u4_frm_offset = ps_dec->u2_frame_width;
158	2.35k	}
159	2.58k	}
160
161	7.58M	do
162	80.5M	{
163
164	80.5M	UWORD32 u4_x_offset, u4_y_offset;
165	80.5M	UWORD32 u4_blk_pos;
166	80.5M	WORD16 i2_dc_val;
167
168	80.5M	UWORD32 u4_dst_x_offset = u4_frm_offset + (ps_dec->u2_mb_x << 4);
169	80.5M	UWORD32 u4_dst_y_offset = (ps_dec->u2_mb_y << 4) * u4_frame_width;
170	80.5M	UWORD8 *pu1_vld_buf8 = ps_cur_frm_buf->pu1_y + u4_dst_x_offset + u4_dst_y_offset;
171	80.5M	UWORD32 u4_dst_wd = u4_frame_width;
172		/------------------------------------------------------------------/
173		/* Discard the Macroblock stuffing in case of MPEG-1 stream */
174		/------------------------------------------------------------------/
175	82.3M	while(impeg2d_bit_stream_nxt(ps_stream,MB_STUFFING_CODE_LEN) == MB_STUFFING_CODE &&
176	1.82M	ps_stream->u4_offset < ps_stream->u4_max_offset)
177	1.82M	impeg2d_bit_stream_flush(ps_stream,MB_STUFFING_CODE_LEN);
178
179		/------------------------------------------------------------------/
180		/* Flush 2 bits from bitstream [MB_Type and MacroBlockAddrIncrement]*/
181		/------------------------------------------------------------------/
182	80.5M	impeg2d_bit_stream_flush(ps_stream,1);
183
184	80.5M	if(impeg2d_bit_stream_get(ps_stream, 1) != 0x01)
185	57.4M	{
186		/* Ignore and continue decoding. */
187	57.4M	}
188
189		/* Process LUMA blocks of the MB */
190	402M	for(i = 0; i < NUM_LUMA_BLKS; ++i)
191	322M	{
192
193	322M	u4_x_offset = gai2_impeg2_blk_x_off[i];
194	322M	u4_y_offset = gai2_impeg2_blk_y_off_frm[i] ;
195	322M	u4_blk_pos = (u4_y_offset * u4_dst_wd) + u4_x_offset;
196	322M	pu1_vld_buf = pu1_vld_buf8 + u4_blk_pos;
197
198	322M	i2_dc_diff = impeg2d_get_luma_dc_diff(ps_stream);
199	322M	i2_dc_val = ps_dec->u2_def_dc_pred[Y_LUMA] + i2_dc_diff;
200	322M	ps_dec->u2_def_dc_pred[Y_LUMA] = i2_dc_val;
201	322M	i2_dc_val = CLIP_U8(i2_dc_val);
202
203	2.90G	for(row = BLK_SIZE; row > 0; row--)
204	2.57G	{
205	2.57G	memset(pu1_vld_buf, i2_dc_val, BLK_SIZE);
206	2.57G	pu1_vld_buf += u4_dst_wd;
207	2.57G	}
208	322M	}
209
210
211
212		/* Process U block of the MB */
213
214	80.5M	u4_dst_x_offset >>= 1;
215	80.5M	u4_dst_y_offset >>= 2;
216	80.5M	u4_dst_wd >>= 1;
217	80.5M	pu1_vld_buf = ps_cur_frm_buf->pu1_u + u4_dst_x_offset + u4_dst_y_offset;
218	80.5M	i2_dc_diff = impeg2d_get_chroma_dc_diff(ps_stream);
219	80.5M	i2_dc_val = ps_dec->u2_def_dc_pred[U_CHROMA] + i2_dc_diff;
220	80.5M	ps_dec->u2_def_dc_pred[U_CHROMA] = i2_dc_val;
221	80.5M	i2_dc_val = CLIP_U8(i2_dc_val);
222	725M	for(row = BLK_SIZE; row > 0; row--)
223	644M	{
224	644M	memset(pu1_vld_buf, i2_dc_val, BLK_SIZE);
225	644M	pu1_vld_buf += u4_dst_wd;
226	644M	}
227
228
229		/* Process V block of the MB */
230
231	80.5M	pu1_vld_buf = ps_cur_frm_buf->pu1_v + u4_dst_x_offset + u4_dst_y_offset;
232	80.5M	i2_dc_diff = impeg2d_get_chroma_dc_diff(ps_stream);
233	80.5M	i2_dc_val = ps_dec->u2_def_dc_pred[V_CHROMA] + i2_dc_diff;
234	80.5M	ps_dec->u2_def_dc_pred[V_CHROMA] = i2_dc_val;
235	80.5M	i2_dc_val = CLIP_U8(i2_dc_val);
236	725M	for(row = BLK_SIZE; row > 0; row--)
237	644M	{
238	644M	memset(pu1_vld_buf, i2_dc_val, BLK_SIZE);
239	644M	pu1_vld_buf += u4_dst_wd;
240	644M	}
241
242		/* Common MB processing Steps */
243
244
245	80.5M	ps_dec->u2_num_mbs_left--;
246	80.5M	ps_dec->u2_mb_x++;
247
248	80.5M	if(ps_dec->s_bit_stream.u4_offset > ps_dec->s_bit_stream.u4_max_offset)
249	3.70k	{
250	3.70k	return IMPEG2D_BITSTREAM_BUFF_EXCEEDED_ERR;
251	3.70k	}
252	80.5M	else if (ps_dec->u2_mb_x == ps_dec->u2_num_horiz_mb)
253	992k	{
254	992k	ps_dec->u2_mb_x = 0;
255	992k	ps_dec->u2_mb_y++;
256
257	992k	}
258
259		/* Flush end of macro block */
260	80.5M	impeg2d_bit_stream_flush(ps_stream,1);
261	80.5M	}
262	80.5M	while(ps_dec->u2_num_mbs_left != 0 && impeg2d_bit_stream_nxt(&ps_dec->s_bit_stream,23) != 0x0);
263	7.58M	return (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;
264	7.58M	}/* End of impeg2d_dec_d_slice() */