1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
20 #include "avclib_common.h"
22 /* see subclause 8.2.2 Decoding process for macroblock to slice group map */
23 OSCL_EXPORT_REF AVCStatus FMOInit(AVCCommonObj *video)
25 AVCPicParamSet *currPPS = video->currPicParams;
26 int *MbToSliceGroupMap = video->MbToSliceGroupMap;
27 int PicSizeInMapUnits = video->PicSizeInMapUnits;
28 int PicWidthInMbs = video->PicWidthInMbs;
30 if (currPPS->num_slice_groups_minus1 == 0)
32 memset(video->MbToSliceGroupMap, 0, video->PicSizeInMapUnits*sizeof(uint));
36 switch (currPPS->slice_group_map_type)
39 FmoGenerateType0MapUnitMap(MbToSliceGroupMap, currPPS->run_length_minus1, currPPS->num_slice_groups_minus1, PicSizeInMapUnits);
42 FmoGenerateType1MapUnitMap(MbToSliceGroupMap, PicWidthInMbs, currPPS->num_slice_groups_minus1, PicSizeInMapUnits);
45 FmoGenerateType2MapUnitMap(currPPS, MbToSliceGroupMap, PicWidthInMbs, currPPS->num_slice_groups_minus1, PicSizeInMapUnits);
48 FmoGenerateType3MapUnitMap(video, currPPS, MbToSliceGroupMap, PicWidthInMbs);
51 FmoGenerateType4MapUnitMap(MbToSliceGroupMap, video->MapUnitsInSliceGroup0, currPPS->slice_group_change_direction_flag, PicSizeInMapUnits);
54 FmoGenerateType5MapUnitMap(MbToSliceGroupMap, video, currPPS->slice_group_change_direction_flag, PicSizeInMapUnits);
57 FmoGenerateType6MapUnitMap(MbToSliceGroupMap, (int*)currPPS->slice_group_id, PicSizeInMapUnits);
60 return AVC_FAIL; /* out of range, shouldn't come this far */
67 /* see subclause 8.2.2.1 interleaved slice group map type*/
68 void FmoGenerateType0MapUnitMap(int *mapUnitToSliceGroupMap, uint *run_length_minus1, uint num_slice_groups_minus1, uint PicSizeInMapUnits)
75 (iGroup <= num_slice_groups_minus1) && (i < PicSizeInMapUnits);
76 i += run_length_minus1[iGroup++] + 1)
78 for (j = 0; j <= run_length_minus1[ iGroup ] && i + j < PicSizeInMapUnits; j++)
79 mapUnitToSliceGroupMap[i+j] = iGroup;
82 while (i < PicSizeInMapUnits);
85 /* see subclause 8.2.2.2 dispersed slice group map type*/
86 void FmoGenerateType1MapUnitMap(int *mapUnitToSliceGroupMap, int PicWidthInMbs, uint num_slice_groups_minus1, uint PicSizeInMapUnits)
89 for (i = 0; i < PicSizeInMapUnits; i++)
91 mapUnitToSliceGroupMap[i] = ((i % PicWidthInMbs) + (((i / PicWidthInMbs) * (num_slice_groups_minus1 + 1)) / 2))
92 % (num_slice_groups_minus1 + 1);
96 /* see subclause 8.2.2.3 foreground with left-over slice group map type */
97 void FmoGenerateType2MapUnitMap(AVCPicParamSet *pps, int *mapUnitToSliceGroupMap, int PicWidthInMbs,
98 uint num_slice_groups_minus1, uint PicSizeInMapUnits)
102 uint yTopLeft, xTopLeft, yBottomRight, xBottomRight;
104 for (i = 0; i < PicSizeInMapUnits; i++)
106 mapUnitToSliceGroupMap[ i ] = num_slice_groups_minus1;
109 for (iGroup = num_slice_groups_minus1 - 1 ; iGroup >= 0; iGroup--)
111 yTopLeft = pps->top_left[ iGroup ] / PicWidthInMbs;
112 xTopLeft = pps->top_left[ iGroup ] % PicWidthInMbs;
113 yBottomRight = pps->bottom_right[ iGroup ] / PicWidthInMbs;
114 xBottomRight = pps->bottom_right[ iGroup ] % PicWidthInMbs;
115 for (y = yTopLeft; y <= yBottomRight; y++)
117 for (x = xTopLeft; x <= xBottomRight; x++)
119 mapUnitToSliceGroupMap[ y * PicWidthInMbs + x ] = iGroup;
126 /* see subclause 8.2.2.4 box-out slice group map type */
127 /* follow the text rather than the JM, it's quite different. */
128 void FmoGenerateType3MapUnitMap(AVCCommonObj *video, AVCPicParamSet* pps, int *mapUnitToSliceGroupMap,
132 int leftBound, topBound, rightBound, bottomBound;
133 int x, y, xDir, yDir;
135 uint PicSizeInMapUnits = video->PicSizeInMapUnits;
136 uint MapUnitsInSliceGroup0 = video->MapUnitsInSliceGroup0;
138 for (i = 0; i < PicSizeInMapUnits; i++)
140 mapUnitToSliceGroupMap[ i ] = 1;
143 x = (PicWidthInMbs - pps->slice_group_change_direction_flag) / 2;
144 y = (video->PicHeightInMapUnits - pps->slice_group_change_direction_flag) / 2;
151 xDir = pps->slice_group_change_direction_flag - 1;
152 yDir = pps->slice_group_change_direction_flag;
154 for (k = 0; k < MapUnitsInSliceGroup0; k += mapUnitVacant)
156 mapUnitVacant = (mapUnitToSliceGroupMap[ y * PicWidthInMbs + x ] == 1);
159 mapUnitToSliceGroupMap[ y * PicWidthInMbs + x ] = 0;
162 if (xDir == -1 && x == leftBound)
164 leftBound = AVC_MAX(leftBound - 1, 0);
167 yDir = 2 * pps->slice_group_change_direction_flag - 1;
169 else if (xDir == 1 && x == rightBound)
171 rightBound = AVC_MIN(rightBound + 1, (int)PicWidthInMbs - 1);
174 yDir = 1 - 2 * pps->slice_group_change_direction_flag;
176 else if (yDir == -1 && y == topBound)
178 topBound = AVC_MAX(topBound - 1, 0);
180 xDir = 1 - 2 * pps->slice_group_change_direction_flag;
183 else if (yDir == 1 && y == bottomBound)
185 bottomBound = AVC_MIN(bottomBound + 1, (int)video->PicHeightInMapUnits - 1);
187 xDir = 2 * pps->slice_group_change_direction_flag - 1;
198 /* see subclause 8.2.2.5 raster scan slice group map types */
199 void FmoGenerateType4MapUnitMap(int *mapUnitToSliceGroupMap, int MapUnitsInSliceGroup0, int slice_group_change_direction_flag, uint PicSizeInMapUnits)
201 uint sizeOfUpperLeftGroup = slice_group_change_direction_flag ? (PicSizeInMapUnits - MapUnitsInSliceGroup0) : MapUnitsInSliceGroup0;
205 for (i = 0; i < PicSizeInMapUnits; i++)
206 if (i < sizeOfUpperLeftGroup)
207 mapUnitToSliceGroupMap[ i ] = 1 - slice_group_change_direction_flag;
209 mapUnitToSliceGroupMap[ i ] = slice_group_change_direction_flag;
213 /* see subclause 8.2.2.6, wipe slice group map type. */
214 void FmoGenerateType5MapUnitMap(int *mapUnitToSliceGroupMap, AVCCommonObj *video,
215 int slice_group_change_direction_flag, uint PicSizeInMapUnits)
217 int PicWidthInMbs = video->PicWidthInMbs;
218 int PicHeightInMapUnits = video->PicHeightInMapUnits;
219 int MapUnitsInSliceGroup0 = video->MapUnitsInSliceGroup0;
220 int sizeOfUpperLeftGroup = slice_group_change_direction_flag ? (PicSizeInMapUnits - MapUnitsInSliceGroup0) : MapUnitsInSliceGroup0;
223 for (j = 0; j < PicWidthInMbs; j++)
225 for (i = 0; i < PicHeightInMapUnits; i++)
227 if (k++ < sizeOfUpperLeftGroup)
229 mapUnitToSliceGroupMap[ i * PicWidthInMbs + j ] = 1 - slice_group_change_direction_flag;
233 mapUnitToSliceGroupMap[ i * PicWidthInMbs + j ] = slice_group_change_direction_flag;
239 /* see subclause 8.2.2.7, explicit slice group map */
240 void FmoGenerateType6MapUnitMap(int *mapUnitToSliceGroupMap, int *slice_group_id, uint PicSizeInMapUnits)
243 for (i = 0; i < PicSizeInMapUnits; i++)
245 mapUnitToSliceGroupMap[i] = slice_group_id[i];