/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 "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_mem_func.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;
    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);

            ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, 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);
        ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, 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);
        ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, 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: 2026-02-26 07:02

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
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_mem_func.h"
28		#include "impeg2_format_conv.h"
29		#include "impeg2_disp_mgr.h"
30		#include "impeg2_buf_mgr.h"
31
32		#include "impeg2d.h"
33		#include "impeg2d_bitstream.h"
34		#include "impeg2d_structs.h"
35		#include "impeg2d_vld.h"
36		#include "impeg2d_vld_tables.h"
37
38		#define BLK_SIZE 8
39		#define LUMA_BLK_SIZE (2 * (BLK_SIZE))
40		#define CHROMA_BLK_SIZE (BLK_SIZE)
41		/*****************************************************************************/
42		/* */
43		/* Function Name : impeg2d_get_luma_dc_diff */
44		/* */
45		/* Description : Decode the DC differential value from the bitstream for */
46		/* luma block */
47		/* */
48		/* Inputs : stream - Input stream */
49		/* */
50		/* Globals : None */
51		/* */
52		/* Processing : Decode the vlc for dc_diff */
53		/* */
54		/* Outputs : dc_diff - dc differential used in dc prediction */
55		/* */
56		/* Returns : dc_diff - dc differential used in dc prediction */
57		/* */
58		/* Issues : None */
59		/* */
60		/* Revision History: */
61		/* */
62		/* DD MM YYYY Author(s) Changes */
63		/* 14 09 2005 Harish M First Version */
64		/* */
65		/*****************************************************************************/
66		WORD16 impeg2d_get_luma_dc_diff(stream_t *ps_stream)
67	76.6M	{
68	76.6M	UWORD16 u2_dc_size;
69	76.6M	WORD16 i2_dc_diff;
70
71	76.6M	u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[0],
72	76.6M	MPEG2_DCT_DC_LUMA_SIZE_LEN) +
73	76.6M	MPEG2_DCT_DC_SIZE_OFFSET;
74	76.6M	if (u2_dc_size != 0)
75	69.1M	{
76	69.1M	i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
77	69.1M	if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
78	51.8M	i2_dc_diff -= (1 << u2_dc_size) - 1;
79	69.1M	}
80	7.45M	else
81	7.45M	{
82	7.45M	i2_dc_diff = 0;
83	7.45M	}
84	76.6M	return i2_dc_diff;
85	76.6M	}
86
87		/*****************************************************************************/
88		/* */
89		/* Function Name : impeg2d_get_chroma_dc_diff */
90		/* */
91		/* Description : Decode the DC differential value from the bitstream for */
92		/* chroma block */
93		/* */
94		/* Inputs : stream - Input stream */
95		/* */
96		/* Globals : None */
97		/* */
98		/* Processing : Decode the vlc for dc_diff */
99		/* */
100		/* Outputs : dc_diff - dc differential used in dc prediction */
101		/* */
102		/* Returns : dc_diff - dc differential used in dc prediction */
103		/* */
104		/* Issues : None */
105		/* */
106		/* Revision History: */
107		/* */
108		/* DD MM YYYY Author(s) Changes */
109		/* 14 09 2005 Harish M First Version */
110		/* */
111		/*****************************************************************************/
112		WORD16 impeg2d_get_chroma_dc_diff(stream_t *ps_stream)
113	38.3M	{
114	38.3M	UWORD16 u2_dc_size;
115	38.3M	WORD16 i2_dc_diff;
116	38.3M	u2_dc_size = impeg2d_dec_vld_symbol(ps_stream,gai2_impeg2d_dct_dc_size[1],
117	38.3M	MPEG2_DCT_DC_CHROMA_SIZE_LEN) +
118	38.3M	MPEG2_DCT_DC_SIZE_OFFSET;
119	38.3M	if (u2_dc_size != 0)
120	19.1M	{
121	19.1M	i2_dc_diff = impeg2d_bit_stream_get(ps_stream,u2_dc_size);
122	19.1M	if ((i2_dc_diff & (1 << (u2_dc_size - 1))) == 0)
123	11.2M	i2_dc_diff -= (1 << u2_dc_size) - 1;
124	19.1M	}
125	19.1M	else
126	19.1M	{
127	19.1M	i2_dc_diff = 0;
128	19.1M	}
129	38.3M	return i2_dc_diff;
130	38.3M	}
131		/*******************************************************************************
132		* Function Name : impeg2d_dec_d_slice
133		*
134		* Description : Decodes I slice
135		*
136		* Arguments :
137		* dec : Decoder state
138		*
139		* Values Returned : None
140		*******************************************************************************/
141		IMPEG2D_ERROR_CODES_T impeg2d_dec_d_slice(dec_state_t *ps_dec)
142	1.90M	{
143	1.90M	UWORD32 i;
144	1.90M	yuv_buf_t *ps_cur_frm_buf = &ps_dec->s_cur_frm_buf;
145
146	1.90M	stream_t *ps_stream = &ps_dec->s_bit_stream;
147	1.90M	UWORD8 *pu1_vld_buf;
148
149	1.90M	WORD16 i2_dc_diff;
150	1.90M	UWORD32 u4_frame_width = ps_dec->u2_frame_width;
151	1.90M	UWORD32 u4_frm_offset = 0;
152	1.90M	if(ps_dec->u2_picture_structure != FRAME_PICTURE)
153	647	{
154	647	u4_frame_width <<= 1;
155	647	if(ps_dec->u2_picture_structure == BOTTOM_FIELD)
156	267	{
157	267	u4_frm_offset = ps_dec->u2_frame_width;
158	267	}
159	647	}
160
161	1.90M	do
162	19.1M	{
163
164	19.1M	UWORD32 u4_x_offset, u4_y_offset;
165	19.1M	UWORD32 u4_blk_pos;
166	19.1M	WORD16 i2_dc_val;
167
168	19.1M	UWORD32 u4_dst_x_offset = u4_frm_offset + (ps_dec->u2_mb_x << 4);
169	19.1M	UWORD32 u4_dst_y_offset = (ps_dec->u2_mb_y << 4) * u4_frame_width;
170	19.1M	UWORD8 *pu1_vld_buf8 = ps_cur_frm_buf->pu1_y + u4_dst_x_offset + u4_dst_y_offset;
171	19.1M	UWORD32 u4_dst_wd = u4_frame_width;
172		/------------------------------------------------------------------/
173		/* Discard the Macroblock stuffing in case of MPEG-1 stream */
174		/------------------------------------------------------------------/
175	19.5M	while(impeg2d_bit_stream_nxt(ps_stream,MB_STUFFING_CODE_LEN) == MB_STUFFING_CODE &&
176	357k	ps_stream->u4_offset < ps_stream->u4_max_offset)
177	357k	impeg2d_bit_stream_flush(ps_stream,MB_STUFFING_CODE_LEN);
178
179		/------------------------------------------------------------------/
180		/* Flush 2 bits from bitstream [MB_Type and MacroBlockAddrIncrement]*/
181		/------------------------------------------------------------------/
182	19.1M	impeg2d_bit_stream_flush(ps_stream,1);
183
184	19.1M	if(impeg2d_bit_stream_get(ps_stream, 1) != 0x01)
185	13.2M	{
186		/* Ignore and continue decoding. */
187	13.2M	}
188
189		/* Process LUMA blocks of the MB */
190	95.8M	for(i = 0; i < NUM_LUMA_BLKS; ++i)
191	76.6M	{
192
193	76.6M	u4_x_offset = gai2_impeg2_blk_x_off[i];
194	76.6M	u4_y_offset = gai2_impeg2_blk_y_off_frm[i] ;
195	76.6M	u4_blk_pos = (u4_y_offset * u4_dst_wd) + u4_x_offset;
196	76.6M	pu1_vld_buf = pu1_vld_buf8 + u4_blk_pos;
197
198	76.6M	i2_dc_diff = impeg2d_get_luma_dc_diff(ps_stream);
199	76.6M	i2_dc_val = ps_dec->u2_def_dc_pred[Y_LUMA] + i2_dc_diff;
200	76.6M	ps_dec->u2_def_dc_pred[Y_LUMA] = i2_dc_val;
201	76.6M	i2_dc_val = CLIP_U8(i2_dc_val);
202
203	76.6M	ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, u4_dst_wd);
204	76.6M	}
205
206
207
208		/* Process U block of the MB */
209
210	19.1M	u4_dst_x_offset >>= 1;
211	19.1M	u4_dst_y_offset >>= 2;
212	19.1M	u4_dst_wd >>= 1;
213	19.1M	pu1_vld_buf = ps_cur_frm_buf->pu1_u + u4_dst_x_offset + u4_dst_y_offset;
214	19.1M	i2_dc_diff = impeg2d_get_chroma_dc_diff(ps_stream);
215	19.1M	i2_dc_val = ps_dec->u2_def_dc_pred[U_CHROMA] + i2_dc_diff;
216	19.1M	ps_dec->u2_def_dc_pred[U_CHROMA] = i2_dc_val;
217	19.1M	i2_dc_val = CLIP_U8(i2_dc_val);
218	19.1M	ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, u4_dst_wd);
219
220
221		/* Process V block of the MB */
222
223	19.1M	pu1_vld_buf = ps_cur_frm_buf->pu1_v + u4_dst_x_offset + u4_dst_y_offset;
224	19.1M	i2_dc_diff = impeg2d_get_chroma_dc_diff(ps_stream);
225	19.1M	i2_dc_val = ps_dec->u2_def_dc_pred[V_CHROMA] + i2_dc_diff;
226	19.1M	ps_dec->u2_def_dc_pred[V_CHROMA] = i2_dc_val;
227	19.1M	i2_dc_val = CLIP_U8(i2_dc_val);
228	19.1M	ps_dec->pf_memset_8bit_8x8_block(pu1_vld_buf, i2_dc_val, u4_dst_wd);
229
230		/* Common MB processing Steps */
231
232
233	19.1M	ps_dec->u2_num_mbs_left--;
234	19.1M	ps_dec->u2_mb_x++;
235
236	19.1M	if(ps_dec->s_bit_stream.u4_offset > ps_dec->s_bit_stream.u4_max_offset)
237	2.25k	{
238	2.25k	return IMPEG2D_BITSTREAM_BUFF_EXCEEDED_ERR;
239	2.25k	}
240	19.1M	else if (ps_dec->u2_mb_x == ps_dec->u2_num_horiz_mb)
241	237k	{
242	237k	ps_dec->u2_mb_x = 0;
243	237k	ps_dec->u2_mb_y++;
244
245	237k	}
246
247		/* Flush end of macro block */
248	19.1M	impeg2d_bit_stream_flush(ps_stream,1);
249	19.1M	}
250	19.1M	while(ps_dec->u2_num_mbs_left != 0 && impeg2d_bit_stream_nxt(&ps_dec->s_bit_stream,23) != 0x0);
251	1.90M	return (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;
252	1.90M	}/* End of impeg2d_dec_d_slice() */