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FFmpeg/libavcodec/dxva2_h264.c
Hendrik Leppkes 64fd62d68a avcodec/dxva2_h264: fix slice offset in long slice struct after ca2f19b9 
The GetBitContext now includes the NAL header, which offsets the slice by
one byte, which needs to be accounted for here.
2016-05-08 17:48:19 +02:00

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/*
* DXVA2 H264 HW acceleration.
*
* copyright (c) 2009 Laurent Aimar
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "h264.h"
#include "h264data.h"
#include "mpegutils.h"
// The headers above may include w32threads.h, which uses the original
// _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
// potentially newer version.
#include "dxva2_internal.h"
struct dxva2_picture_context {
DXVA_PicParams_H264 pp;
DXVA_Qmatrix_H264 qm;
unsigned slice_count;
DXVA_Slice_H264_Short slice_short[MAX_SLICES];
DXVA_Slice_H264_Long slice_long[MAX_SLICES];
const uint8_t *bitstream;
unsigned bitstream_size;
};
static void fill_picture_entry(DXVA_PicEntry_H264 *pic,
unsigned index, unsigned flag)
{
assert((index&0x7f) == index && (flag&0x01) == flag);
pic->bPicEntry = index | (flag << 7);
}
static void fill_picture_parameters(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h,
DXVA_PicParams_H264 *pp)
{
const H264Picture *current_picture = h->cur_pic_ptr;
int i, j;
memset(pp, 0, sizeof(*pp));
/* Configure current picture */
fill_picture_entry(&pp->CurrPic,
ff_dxva2_get_surface_index(avctx, ctx, current_picture->f),
h->picture_structure == PICT_BOTTOM_FIELD);
/* Configure the set of references */
pp->UsedForReferenceFlags = 0;
pp->NonExistingFrameFlags = 0;
for (i = 0, j = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
const H264Picture *r;
if (j < h->short_ref_count) {
r = h->short_ref[j++];
} else {
r = NULL;
while (!r && j < h->short_ref_count + 16)
r = h->long_ref[j++ - h->short_ref_count];
}
if (r) {
fill_picture_entry(&pp->RefFrameList[i],
ff_dxva2_get_surface_index(avctx, ctx, r->f),
r->long_ref != 0);
if ((r->reference & PICT_TOP_FIELD) && r->field_poc[0] != INT_MAX)
pp->FieldOrderCntList[i][0] = r->field_poc[0];
if ((r->reference & PICT_BOTTOM_FIELD) && r->field_poc[1] != INT_MAX)
pp->FieldOrderCntList[i][1] = r->field_poc[1];
pp->FrameNumList[i] = r->long_ref ? r->pic_id : r->frame_num;
if (r->reference & PICT_TOP_FIELD)
pp->UsedForReferenceFlags |= 1 << (2*i + 0);
if (r->reference & PICT_BOTTOM_FIELD)
pp->UsedForReferenceFlags |= 1 << (2*i + 1);
} else {
pp->RefFrameList[i].bPicEntry = 0xff;
pp->FieldOrderCntList[i][0] = 0;
pp->FieldOrderCntList[i][1] = 0;
pp->FrameNumList[i] = 0;
}
}
pp->wFrameWidthInMbsMinus1 = h->mb_width - 1;
pp->wFrameHeightInMbsMinus1 = h->mb_height - 1;
pp->num_ref_frames = h->sps.ref_frame_count;
pp->wBitFields = ((h->picture_structure != PICT_FRAME) << 0) |
((h->sps.mb_aff &&
(h->picture_structure == PICT_FRAME)) << 1) |
(h->sps.residual_color_transform_flag << 2) |
/* sp_for_switch_flag (not implemented by FFmpeg) */
(0 << 3) |
(h->sps.chroma_format_idc << 4) |
((h->nal_ref_idc != 0) << 6) |
(h->pps.constrained_intra_pred << 7) |
(h->pps.weighted_pred << 8) |
(h->pps.weighted_bipred_idc << 9) |
/* MbsConsecutiveFlag */
(1 << 11) |
(h->sps.frame_mbs_only_flag << 12) |
(h->pps.transform_8x8_mode << 13) |
((h->sps.level_idc >= 31) << 14) |
/* IntraPicFlag (Modified if we detect a non
* intra slice in dxva2_h264_decode_slice) */
(1 << 15);
pp->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8;
pp->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8;
if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG)
pp->Reserved16Bits = 0;
else if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
pp->Reserved16Bits = 0x34c;
else
pp->Reserved16Bits = 3; /* FIXME is there a way to detect the right mode ? */
pp->StatusReportFeedbackNumber = 1 + DXVA_CONTEXT_REPORT_ID(avctx, ctx)++;
pp->CurrFieldOrderCnt[0] = 0;
if ((h->picture_structure & PICT_TOP_FIELD) &&
current_picture->field_poc[0] != INT_MAX)
pp->CurrFieldOrderCnt[0] = current_picture->field_poc[0];
pp->CurrFieldOrderCnt[1] = 0;
if ((h->picture_structure & PICT_BOTTOM_FIELD) &&
current_picture->field_poc[1] != INT_MAX)
pp->CurrFieldOrderCnt[1] = current_picture->field_poc[1];
pp->pic_init_qs_minus26 = h->pps.init_qs - 26;
pp->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
pp->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
pp->ContinuationFlag = 1;
pp->pic_init_qp_minus26 = h->pps.init_qp - 26;
pp->num_ref_idx_l0_active_minus1 = h->pps.ref_count[0] - 1;
pp->num_ref_idx_l1_active_minus1 = h->pps.ref_count[1] - 1;
pp->Reserved8BitsA = 0;
pp->frame_num = h->frame_num;
pp->log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
pp->pic_order_cnt_type = h->sps.poc_type;
if (h->sps.poc_type == 0)
pp->log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
else if (h->sps.poc_type == 1)
pp->delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
pp->direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
pp->entropy_coding_mode_flag = h->pps.cabac;
pp->pic_order_present_flag = h->pps.pic_order_present;
pp->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
pp->slice_group_map_type = h->pps.mb_slice_group_map_type;
pp->deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
pp->redundant_pic_cnt_present_flag= h->pps.redundant_pic_cnt_present;
pp->Reserved8BitsB = 0;
pp->slice_group_change_rate_minus1= 0; /* XXX not implemented by FFmpeg */
//pp->SliceGroupMap[810]; /* XXX not implemented by FFmpeg */
}
static void fill_scaling_lists(const AVCodecContext *avctx, AVDXVAContext *ctx, const H264Context *h, DXVA_Qmatrix_H264 *qm)
{
unsigned i, j;
memset(qm, 0, sizeof(*qm));
if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_SCALING_LIST_ZIGZAG) {
for (i = 0; i < 6; i++)
for (j = 0; j < 16; j++)
qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][j];
for (i = 0; i < 64; i++) {
qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][i];
qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][i];
}
} else {
for (i = 0; i < 6; i++)
for (j = 0; j < 16; j++)
qm->bScalingLists4x4[i][j] = h->pps.scaling_matrix4[i][ff_zigzag_scan[j]];
for (i = 0; i < 64; i++) {
qm->bScalingLists8x8[0][i] = h->pps.scaling_matrix8[0][ff_zigzag_direct[i]];
qm->bScalingLists8x8[1][i] = h->pps.scaling_matrix8[3][ff_zigzag_direct[i]];
}
}
}
static int is_slice_short(const AVCodecContext *avctx, AVDXVAContext *ctx)
{
assert(DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 1 ||
DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2);
return DXVA_CONTEXT_CFG_BITSTREAM(avctx, ctx) == 2;
}
static void fill_slice_short(DXVA_Slice_H264_Short *slice,
unsigned position, unsigned size)
{
memset(slice, 0, sizeof(*slice));
slice->BSNALunitDataLocation = position;
slice->SliceBytesInBuffer = size;
slice->wBadSliceChopping = 0;
}
static int get_refpic_index(const DXVA_PicParams_H264 *pp, int surface_index)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(pp->RefFrameList); i++) {
if ((pp->RefFrameList[i].bPicEntry & 0x7f) == surface_index)
return i;
}
return 0x7f;
}
static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
const DXVA_PicParams_H264 *pp, unsigned position, unsigned size)
{
const H264Context *h = avctx->priv_data;
H264SliceContext *sl = &h->slice_ctx[0];
AVDXVAContext *ctx = avctx->hwaccel_context;
unsigned list;
memset(slice, 0, sizeof(*slice));
slice->BSNALunitDataLocation = position;
slice->SliceBytesInBuffer = size;
slice->wBadSliceChopping = 0;
slice->first_mb_in_slice = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
slice->NumMbsForSlice = 0; /* XXX it is set once we have all slices */
slice->BitOffsetToSliceData = get_bits_count(&sl->gb) - 8;
slice->slice_type = ff_h264_get_slice_type(sl);
if (sl->slice_type_fixed)
slice->slice_type += 5;
slice->luma_log2_weight_denom = sl->pwt.luma_log2_weight_denom;
slice->chroma_log2_weight_denom = sl->pwt.chroma_log2_weight_denom;
if (sl->list_count > 0)
slice->num_ref_idx_l0_active_minus1 = sl->ref_count[0] - 1;
if (sl->list_count > 1)
slice->num_ref_idx_l1_active_minus1 = sl->ref_count[1] - 1;
slice->slice_alpha_c0_offset_div2 = sl->slice_alpha_c0_offset / 2;
slice->slice_beta_offset_div2 = sl->slice_beta_offset / 2;
slice->Reserved8Bits = 0;
for (list = 0; list < 2; list++) {
unsigned i;
for (i = 0; i < FF_ARRAY_ELEMS(slice->RefPicList[list]); i++) {
if (list < sl->list_count && i < sl->ref_count[list]) {
const H264Picture *r = sl->ref_list[list][i].parent;
unsigned plane;
unsigned index;
if (DXVA_CONTEXT_WORKAROUND(avctx, ctx) & FF_DXVA2_WORKAROUND_INTEL_CLEARVIDEO)
index = ff_dxva2_get_surface_index(avctx, ctx, r->f);
else
index = get_refpic_index(pp, ff_dxva2_get_surface_index(avctx, ctx, r->f));
fill_picture_entry(&slice->RefPicList[list][i], index,
sl->ref_list[list][i].reference == PICT_BOTTOM_FIELD);
for (plane = 0; plane < 3; plane++) {
int w, o;
if (plane == 0 && sl->pwt.luma_weight_flag[list]) {
w = sl->pwt.luma_weight[i][list][0];
o = sl->pwt.luma_weight[i][list][1];
} else if (plane >= 1 && sl->pwt.chroma_weight_flag[list]) {
w = sl->pwt.chroma_weight[i][list][plane-1][0];
o = sl->pwt.chroma_weight[i][list][plane-1][1];
} else {
w = 1 << (plane == 0 ? sl->pwt.luma_log2_weight_denom :
sl->pwt.chroma_log2_weight_denom);
o = 0;
}
slice->Weights[list][i][plane][0] = w;
slice->Weights[list][i][plane][1] = o;
}
} else {
unsigned plane;
slice->RefPicList[list][i].bPicEntry = 0xff;
for (plane = 0; plane < 3; plane++) {
slice->Weights[list][i][plane][0] = 0;
slice->Weights[list][i][plane][1] = 0;
}
}
}
}
slice->slice_qs_delta = 0; /* XXX not implemented by FFmpeg */
slice->slice_qp_delta = sl->qscale - h->pps.init_qp;
slice->redundant_pic_cnt = sl->redundant_pic_count;
if (sl->slice_type == AV_PICTURE_TYPE_B)
slice->direct_spatial_mv_pred_flag = sl->direct_spatial_mv_pred;
slice->cabac_init_idc = h->pps.cabac ? sl->cabac_init_idc : 0;
if (sl->deblocking_filter < 2)
slice->disable_deblocking_filter_idc = 1 - sl->deblocking_filter;
else
slice->disable_deblocking_filter_idc = sl->deblocking_filter;
slice->slice_id = h->current_slice - 1;
}
static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
DECODER_BUFFER_DESC *bs,
DECODER_BUFFER_DESC *sc)
{
const H264Context *h = avctx->priv_data;
const unsigned mb_count = h->mb_width * h->mb_height;
AVDXVAContext *ctx = avctx->hwaccel_context;
const H264Picture *current_picture = h->cur_pic_ptr;
struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
DXVA_Slice_H264_Short *slice = NULL;
void *dxva_data_ptr = NULL;
uint8_t *dxva_data, *current, *end;
unsigned dxva_size = 0;
void *slice_data;
unsigned slice_size;
unsigned padding;
unsigned i;
unsigned type;
/* Create an annex B bitstream buffer with only slice NAL and finalize slice */
#if CONFIG_D3D11VA
if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD) {
type = D3D11_VIDEO_DECODER_BUFFER_BITSTREAM;
if (FAILED(ID3D11VideoContext_GetDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context,
D3D11VA_CONTEXT(ctx)->decoder,
type,
&dxva_size, &dxva_data_ptr)))
return -1;
}
#endif
#if CONFIG_DXVA2
if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
type = DXVA2_BitStreamDateBufferType;
if (FAILED(IDirectXVideoDecoder_GetBuffer(DXVA2_CONTEXT(ctx)->decoder,
type,
&dxva_data_ptr, &dxva_size)))
return -1;
}
#endif
dxva_data = dxva_data_ptr;
current = dxva_data;
end = dxva_data + dxva_size;
for (i = 0; i < ctx_pic->slice_count; i++) {
static const uint8_t start_code[] = { 0, 0, 1 };
static const unsigned start_code_size = sizeof(start_code);
unsigned position, size;
assert(offsetof(DXVA_Slice_H264_Short, BSNALunitDataLocation) ==
offsetof(DXVA_Slice_H264_Long, BSNALunitDataLocation));
assert(offsetof(DXVA_Slice_H264_Short, SliceBytesInBuffer) ==
offsetof(DXVA_Slice_H264_Long, SliceBytesInBuffer));
if (is_slice_short(avctx, ctx))
slice = &ctx_pic->slice_short[i];
else
slice = (DXVA_Slice_H264_Short*)&ctx_pic->slice_long[i];
position = slice->BSNALunitDataLocation;
size = slice->SliceBytesInBuffer;
if (start_code_size + size > end - current) {
av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
break;
}
slice->BSNALunitDataLocation = current - dxva_data;
slice->SliceBytesInBuffer = start_code_size + size;
if (!is_slice_short(avctx, ctx)) {
DXVA_Slice_H264_Long *slice_long = (DXVA_Slice_H264_Long*)slice;
if (i < ctx_pic->slice_count - 1)
slice_long->NumMbsForSlice =
slice_long[1].first_mb_in_slice - slice_long[0].first_mb_in_slice;
else
slice_long->NumMbsForSlice = mb_count - slice_long->first_mb_in_slice;
}
memcpy(current, start_code, start_code_size);
current += start_code_size;
memcpy(current, &ctx_pic->bitstream[position], size);
current += size;
}
padding = FFMIN(128 - ((current - dxva_data) & 127), end - current);
if (slice && padding > 0) {
memset(current, 0, padding);
current += padding;
slice->SliceBytesInBuffer += padding;
}
#if CONFIG_D3D11VA
if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD)
if (FAILED(ID3D11VideoContext_ReleaseDecoderBuffer(D3D11VA_CONTEXT(ctx)->video_context, D3D11VA_CONTEXT(ctx)->decoder, type)))
return -1;
#endif
#if CONFIG_DXVA2
if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD)
if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(DXVA2_CONTEXT(ctx)->decoder, type)))
return -1;
#endif
if (i < ctx_pic->slice_count)
return -1;
#if CONFIG_D3D11VA
if (avctx->pix_fmt == AV_PIX_FMT_D3D11VA_VLD) {
D3D11_VIDEO_DECODER_BUFFER_DESC *dsc11 = bs;
memset(dsc11, 0, sizeof(*dsc11));
dsc11->BufferType = type;
dsc11->DataSize = current - dxva_data;
dsc11->NumMBsInBuffer = mb_count;
type = D3D11_VIDEO_DECODER_BUFFER_SLICE_CONTROL;
av_assert0((dsc11->DataSize & 127) == 0);
}
#endif
#if CONFIG_DXVA2
if (avctx->pix_fmt == AV_PIX_FMT_DXVA2_VLD) {
DXVA2_DecodeBufferDesc *dsc2 = bs;
memset(dsc2, 0, sizeof(*dsc2));
dsc2->CompressedBufferType = type;
dsc2->DataSize = current - dxva_data;
dsc2->NumMBsInBuffer = mb_count;
type = DXVA2_SliceControlBufferType;
av_assert0((dsc2->DataSize & 127) == 0);
}
#endif
if (is_slice_short(avctx, ctx)) {
slice_data = ctx_pic->slice_short;
slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_short);
} else {
slice_data = ctx_pic->slice_long;
slice_size = ctx_pic->slice_count * sizeof(*ctx_pic->slice_long);
}
return ff_dxva2_commit_buffer(avctx, ctx, sc,
type,
slice_data, slice_size, mb_count);
}
static int dxva2_h264_start_frame(AVCodecContext *avctx,
av_unused const uint8_t *buffer,
av_unused uint32_t size)
{
const H264Context *h = avctx->priv_data;
AVDXVAContext *ctx = avctx->hwaccel_context;
struct dxva2_picture_context *ctx_pic = h->cur_pic_ptr->hwaccel_picture_private;
if (DXVA_CONTEXT_DECODER(avctx, ctx) == NULL ||
DXVA_CONTEXT_CFG(avctx, ctx) == NULL ||
DXVA_CONTEXT_COUNT(avctx, ctx) <= 0)
return -1;
assert(ctx_pic);
/* Fill up DXVA_PicParams_H264 */
fill_picture_parameters(avctx, ctx, h, &ctx_pic->pp);
/* Fill up DXVA_Qmatrix_H264 */
fill_scaling_lists(avctx, ctx, h, &ctx_pic->qm);
ctx_pic->slice_count = 0;
ctx_pic->bitstream_size = 0;
ctx_pic->bitstream = NULL;
return 0;
}
static int dxva2_h264_decode_slice(AVCodecContext *avctx,
const uint8_t *buffer,
uint32_t size)
{
const H264Context *h = avctx->priv_data;
const H264SliceContext *sl = &h->slice_ctx[0];
AVDXVAContext *ctx = avctx->hwaccel_context;
const H264Picture *current_picture = h->cur_pic_ptr;
struct dxva2_picture_context *ctx_pic = current_picture->hwaccel_picture_private;
unsigned position;
if (ctx_pic->slice_count >= MAX_SLICES)
return -1;
if (!ctx_pic->bitstream)
ctx_pic->bitstream = buffer;
ctx_pic->bitstream_size += size;
position = buffer - ctx_pic->bitstream;
if (is_slice_short(avctx, ctx))
fill_slice_short(&ctx_pic->slice_short[ctx_pic->slice_count],
position, size);
else
fill_slice_long(avctx, &ctx_pic->slice_long[ctx_pic->slice_count],
&ctx_pic->pp, position, size);
ctx_pic->slice_count++;
if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI)
ctx_pic->pp.wBitFields &= ~(1 << 15); /* Set IntraPicFlag to 0 */
return 0;
}
static int dxva2_h264_end_frame(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
H264SliceContext *sl = &h->slice_ctx[0];
struct dxva2_picture_context *ctx_pic =
h->cur_pic_ptr->hwaccel_picture_private;
int ret;
if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
return -1;
ret = ff_dxva2_common_end_frame(avctx, h->cur_pic_ptr->f,
&ctx_pic->pp, sizeof(ctx_pic->pp),
&ctx_pic->qm, sizeof(ctx_pic->qm),
commit_bitstream_and_slice_buffer);
if (!ret)
ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
return ret;
}
#if CONFIG_H264_DXVA2_HWACCEL
AVHWAccel ff_h264_dxva2_hwaccel = {
.name = "h264_dxva2",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.pix_fmt = AV_PIX_FMT_DXVA2_VLD,
.start_frame = dxva2_h264_start_frame,
.decode_slice = dxva2_h264_decode_slice,
.end_frame = dxva2_h264_end_frame,
.frame_priv_data_size = sizeof(struct dxva2_picture_context),
};
#endif
#if CONFIG_H264_D3D11VA_HWACCEL
AVHWAccel ff_h264_d3d11va_hwaccel = {
.name = "h264_d3d11va",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.pix_fmt = AV_PIX_FMT_D3D11VA_VLD,
.start_frame = dxva2_h264_start_frame,
.decode_slice = dxva2_h264_decode_slice,
.end_frame = dxva2_h264_end_frame,
.frame_priv_data_size = sizeof(struct dxva2_picture_context),
};
#endif
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