1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18 #include "mp4dec_lib.h" /* video decoder function prototypes */
19 #include "vlc_decode.h"
20 #include "bitstream.h"
21 #include "scaling.h"
22
23 /* ====================================================================== /
24 Function : ConcealTexture_I()
25 Date : 06/12/2001
26 Purpose : Conceal texture for I-partition
27 In/out :
28 Return :
29 Modified :
30 / ====================================================================== */
ConcealTexture_I(VideoDecData * video,int32 startFirstPartition,int mb_start,int mb_stop,int slice_counter)31 void ConcealTexture_I(VideoDecData *video, int32 startFirstPartition, int mb_start, int mb_stop, int slice_counter)
32 {
33 int mbnum;
34 BitstreamDecVideo *stream = video->bitstream;
35 int16 QP;
36 int intra_dc_vlc_thr = video->currVop->intraDCVlcThr;
37
38 movePointerTo(stream, startFirstPartition);
39
40 video->usePrevQP = 0;
41 for (mbnum = mb_start; mbnum < mb_stop; mbnum++)
42 {
43 video->mbnum = mbnum;
44 video->mbnum_row = PV_GET_ROW(mbnum, video->nMBPerRow);
45 video->mbnum_col = mbnum - video->mbnum_row * video->nMBPerRow;
46 video->sliceNo[mbnum] = (uint8) slice_counter;
47 QP = video->QPMB[mbnum];
48 PV_VlcDecMCBPC_com_intra(stream);
49 GetMBheaderDataPart_DQUANT_DC(video, &QP);
50
51 if (intra_dc_vlc_thr)
52 {
53 if (video->usePrevQP)
54 QP = video->QPMB[mbnum-1];
55 if (intra_dc_vlc_thr == 7 || QP >= intra_dc_vlc_thr*2 + 11) /* if switched then conceal from previous frame */
56 {
57 ConcealPacket(video, mbnum, mb_stop, slice_counter);
58 video->mbnum = mb_stop - 1;
59 video->mbnum_row = PV_GET_ROW(video->mbnum, video->nMBPerRow);
60 video->mbnum_col = video->mbnum - video->mbnum_row * video->nMBPerRow;
61 break;
62 }
63 }
64
65 video->headerInfo.CBP[mbnum] = 0;
66 video->acPredFlag[mbnum] = 0;
67 GetMBData_DataPart(video);
68 video->usePrevQP = 1;
69 }
70 return;
71 }
72
73 /* ====================================================================== /
74 Function : ConcealTexture_P()
75 Date : 05/16/2000
76 Purpose : Conceal texture for P-partition
77 In/out :
78 Return :
79 / ====================================================================== */
80
ConcealTexture_P(VideoDecData * video,int mb_start,int mb_stop,int slice_counter)81 void ConcealTexture_P(VideoDecData *video, int mb_start, int mb_stop, int slice_counter)
82 {
83 int mbnum;
84
85 for (mbnum = mb_start; mbnum < mb_stop; mbnum++)
86 {
87 video->mbnum = mbnum;
88 video->mbnum_row = PV_GET_ROW(mbnum, video->nMBPerRow);
89 video->mbnum_col = mbnum - video->mbnum_row * video->nMBPerRow;
90 video->sliceNo[mbnum] = (uint8) slice_counter;
91 oscl_memset(video->mblock->block, 0, sizeof(typeMBStore));
92 /* to get rid of dark region caused by INTRA blocks */
93 /* 05/19/2000 */
94 if (video->headerInfo.Mode[mbnum] & INTER_MASK)
95 {
96 MBMotionComp(video, 0);
97 }
98 else
99 {
100 video->headerInfo.Mode[mbnum] = MODE_SKIPPED;
101 SkippedMBMotionComp(video);
102 }
103 }
104
105 return;
106 }
107
108 /***************************************************************
109 Function: ConcealPacket
110 Purpose : Conceal motion and texture of a packet by direct
111 copying from previous frame.
112 Returned: void
113 Modified:
114 *************************************************************/
ConcealPacket(VideoDecData * video,int mb_start,int mb_stop,int slice_counter)115 void ConcealPacket(VideoDecData *video,
116 int mb_start,
117 int mb_stop,
118 int slice_counter)
119 {
120 int i;
121 for (i = mb_start; i < mb_stop; i++)
122 {
123 CopyVopMB(video->currVop, video->concealFrame, i, video->width, video->height);
124 video->sliceNo[i] = (uint8) slice_counter;
125 video->headerInfo.Mode[i] = MODE_SKIPPED;
126 }
127
128 return;
129 }
130
131 /****************************************************************************
132 Function: CopyVopMB
133 Purpose : Fill a macroblock with previous Vop.
134 Returned : void
135 Modified: 6/04/2001 rewrote the function
136 copies from concealFrame
137 ****************************************************************************/
CopyVopMB(Vop * curr,uint8 * prevFrame,int mbnum,int width_Y,int height)138 void CopyVopMB(Vop *curr, uint8 *prevFrame, int mbnum, int width_Y, int height)
139 {
140 int width_C = width_Y >> 1;
141 int row = MB_SIZE;
142 uint8 *y1, *y2, *u1, *u2, *v1, *v2;
143 int xpos, ypos, MB_in_width;
144 int32 lumstart, chrstart, size;
145
146 MB_in_width = (width_Y + 15) >> 4;
147 ypos = PV_GET_ROW(mbnum, MB_in_width);
148 xpos = mbnum - ypos * MB_in_width;
149 lumstart = (ypos << 4) * (int32)width_Y + (xpos << 4);
150 chrstart = (ypos << 3) * (int32)width_C + (xpos << 3);
151
152 size = (int32)height * width_Y;
153
154 y1 = curr->yChan + lumstart;
155 u1 = curr->uChan + chrstart;
156 v1 = curr->vChan + chrstart;
157 y2 = prevFrame + lumstart;
158 u2 = prevFrame + size + chrstart;
159 v2 = prevFrame + size + (size >> 2) + chrstart;
160 while (row)
161 {
162 oscl_memcpy(y1, y2, MB_SIZE);
163 y1 += width_Y;
164 y2 += width_Y;
165 oscl_memcpy(y1, y2, MB_SIZE);
166 y1 += width_Y;
167 y2 += width_Y;
168 oscl_memcpy(y1, y2, MB_SIZE);
169 y1 += width_Y;
170 y2 += width_Y;
171 oscl_memcpy(y1, y2, MB_SIZE);
172 y1 += width_Y;
173 y2 += width_Y;
174
175 oscl_memcpy(u1, u2, B_SIZE);
176 u1 += width_C;
177 u2 += width_C;
178 oscl_memcpy(u1, u2, B_SIZE);
179 u1 += width_C;
180 u2 += width_C;
181
182 oscl_memcpy(v1, v2, B_SIZE);
183 v1 += width_C;
184 v2 += width_C;
185 oscl_memcpy(v1, v2, B_SIZE);
186 v1 += width_C;
187 v2 += width_C;
188
189 row -= 4;
190 }
191 return;
192 } /* CopyVopMB */
193
194