diff options
Diffstat (limited to 'media/libstagefright/codecs/m4v_h263/dec/src/conceal.cpp')
| -rw-r--r-- | media/libstagefright/codecs/m4v_h263/dec/src/conceal.cpp | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/m4v_h263/dec/src/conceal.cpp b/media/libstagefright/codecs/m4v_h263/dec/src/conceal.cpp new file mode 100644 index 0000000..e9ead01 --- /dev/null +++ b/media/libstagefright/codecs/m4v_h263/dec/src/conceal.cpp @@ -0,0 +1,193 @@ +/* ------------------------------------------------------------------ + * Copyright (C) 1998-2009 PacketVideo + * + * 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. + * ------------------------------------------------------------------- + */ +#include "mp4dec_lib.h" /* video decoder function prototypes */ +#include "vlc_decode.h" +#include "bitstream.h" +#include "scaling.h" + +/* ====================================================================== / +Function : ConcealTexture_I() +Date : 06/12/2001 +Purpose : Conceal texture for I-partition +In/out : +Return : +Modified : +/ ====================================================================== */ +void ConcealTexture_I(VideoDecData *video, int32 startFirstPartition, int mb_start, int mb_stop, int slice_counter) +{ + int mbnum; + BitstreamDecVideo *stream = video->bitstream; + int16 QP; + int intra_dc_vlc_thr = video->currVop->intraDCVlcThr; + + movePointerTo(stream, startFirstPartition); + + video->usePrevQP = 0; + for (mbnum = mb_start; mbnum < mb_stop; mbnum++) + { + video->mbnum = mbnum; + video->mbnum_row = PV_GET_ROW(mbnum, video->nMBPerRow); + video->mbnum_col = mbnum - video->mbnum_row * video->nMBPerRow; + video->sliceNo[mbnum] = (uint8) slice_counter; + QP = video->QPMB[mbnum]; + PV_VlcDecMCBPC_com_intra(stream); + GetMBheaderDataPart_DQUANT_DC(video, &QP); + + if (intra_dc_vlc_thr) + { + if (video->usePrevQP) + QP = video->QPMB[mbnum-1]; + if (intra_dc_vlc_thr == 7 || QP >= intra_dc_vlc_thr*2 + 11) /* if switched then conceal from previous frame */ + { + ConcealPacket(video, mbnum, mb_stop, slice_counter); + video->mbnum = mb_stop - 1; + video->mbnum_row = PV_GET_ROW(video->mbnum, video->nMBPerRow); + video->mbnum_col = video->mbnum - video->mbnum_row * video->nMBPerRow; + break; + } + } + + video->headerInfo.CBP[mbnum] = 0; + video->acPredFlag[mbnum] = 0; + GetMBData_DataPart(video); + video->usePrevQP = 1; + } + return; +} + +/* ====================================================================== / +Function : ConcealTexture_P() +Date : 05/16/2000 +Purpose : Conceal texture for P-partition +In/out : +Return : +/ ====================================================================== */ + +void ConcealTexture_P(VideoDecData *video, int mb_start, int mb_stop, int slice_counter) +{ + int mbnum; + + for (mbnum = mb_start; mbnum < mb_stop; mbnum++) + { + video->mbnum = mbnum; + video->mbnum_row = PV_GET_ROW(mbnum, video->nMBPerRow); + video->mbnum_col = mbnum - video->mbnum_row * video->nMBPerRow; + video->sliceNo[mbnum] = (uint8) slice_counter; + oscl_memset(video->mblock->block, 0, sizeof(typeMBStore)); + /* to get rid of dark region caused by INTRA blocks */ + /* 05/19/2000 */ + if (video->headerInfo.Mode[mbnum] & INTER_MASK) + { + MBMotionComp(video, 0); + } + else + { + video->headerInfo.Mode[mbnum] = MODE_SKIPPED; + SkippedMBMotionComp(video); + } + } + + return; +} + +/*************************************************************** +Function: ConcealPacket +Purpose : Conceal motion and texture of a packet by direct +copying from previous frame. +Returned: void +Modified: +*************************************************************/ +void ConcealPacket(VideoDecData *video, + int mb_start, + int mb_stop, + int slice_counter) +{ + int i; + for (i = mb_start; i < mb_stop; i++) + { + CopyVopMB(video->currVop, video->concealFrame, i, video->width, video->height); + video->sliceNo[i] = (uint8) slice_counter; + video->headerInfo.Mode[i] = MODE_SKIPPED; + } + + return; +} + +/**************************************************************************** +Function: CopyVopMB +Purpose : Fill a macroblock with previous Vop. +Returned : void +Modified: 6/04/2001 rewrote the function + copies from concealFrame +****************************************************************************/ +void CopyVopMB(Vop *curr, uint8 *prevFrame, int mbnum, int width_Y, int height) +{ + int width_C = width_Y >> 1; + int row = MB_SIZE; + uint8 *y1, *y2, *u1, *u2, *v1, *v2; + int xpos, ypos, MB_in_width; + int32 lumstart, chrstart, size; + + MB_in_width = (width_Y + 15) >> 4; + ypos = PV_GET_ROW(mbnum, MB_in_width); + xpos = mbnum - ypos * MB_in_width; + lumstart = (ypos << 4) * (int32)width_Y + (xpos << 4); + chrstart = (ypos << 3) * (int32)width_C + (xpos << 3); + + size = (int32)height * width_Y; + + y1 = curr->yChan + lumstart; + u1 = curr->uChan + chrstart; + v1 = curr->vChan + chrstart; + y2 = prevFrame + lumstart; + u2 = prevFrame + size + chrstart; + v2 = prevFrame + size + (size >> 2) + chrstart; + while (row) + { + oscl_memcpy(y1, y2, MB_SIZE); + y1 += width_Y; + y2 += width_Y; + oscl_memcpy(y1, y2, MB_SIZE); + y1 += width_Y; + y2 += width_Y; + oscl_memcpy(y1, y2, MB_SIZE); + y1 += width_Y; + y2 += width_Y; + oscl_memcpy(y1, y2, MB_SIZE); + y1 += width_Y; + y2 += width_Y; + + oscl_memcpy(u1, u2, B_SIZE); + u1 += width_C; + u2 += width_C; + oscl_memcpy(u1, u2, B_SIZE); + u1 += width_C; + u2 += width_C; + + oscl_memcpy(v1, v2, B_SIZE); + v1 += width_C; + v2 += width_C; + oscl_memcpy(v1, v2, B_SIZE); + v1 += width_C; + v2 += width_C; + + row -= 4; + } + return; +} /* CopyVopMB */ + |