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ffmpeg/libavcodec/h264_parser.c

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/*
* H.26L/H.264/AVC/JVT/14496-10/... parser
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
/**
* @file
* H.264 / AVC / MPEG-4 part10 parser.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#define UNCHECKED_BITSTREAM_READER 1
#include <stdint.h>
#include "libavutil/avutil.h"
#include "libavutil/error.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/pixfmt.h"
#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"
#include "h264.h"
#include "h264dsp.h"
#include "h264_parse.h"
#include "h264_sei.h"
#include "h264_ps.h"
#include "h2645_parse.h"
#include "h264data.h"
#include "mpegutils.h"
#include "parser.h"
#include "startcode.h"
typedef struct H264ParseContext {
ParseContext pc;
H264ParamSets ps;
H264DSPContext h264dsp;
H264POCContext poc;
H264SEIContext sei;
int is_avc;
int nal_length_size;
int got_first;
int picture_structure;
uint8_t parse_history[6];
int parse_history_count;
int parse_last_mb;
int64_t reference_dts;
int last_frame_num, last_picture_structure;
} H264ParseContext;
static int find_start_code(const uint8_t *buf, int buf_size,
int buf_index, int next_avc)
{
uint32_t state = -1;
buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
return FFMIN(buf_index, buf_size);
}
static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
int buf_size, void *logctx)
{
int i, j;
uint32_t state;
ParseContext *pc = &p->pc;
int next_avc = p->is_avc ? 0 : buf_size;
// mb_addr= pc->mb_addr - 1;
state = pc->state;
if (state > 13)
state = 7;
if (p->is_avc && !p->nal_length_size)
av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
for (i = 0; i < buf_size; i++) {
if (i >= next_avc) {
int64_t nalsize = 0;
i = next_avc;
for (j = 0; j < p->nal_length_size; j++)
nalsize = (nalsize << 8) | buf[i++];
if (!nalsize || nalsize > buf_size - i) {
av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %"PRId64" "
"remaining %d\n", nalsize, buf_size - i);
return buf_size;
}
next_avc = i + nalsize;
state = 5;
}
if (state == 7) {
i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
if (i < next_avc)
state = 2;
} else if (state <= 2) {
if (buf[i] == 1)
state ^= 5; // 2->7, 1->4, 0->5
else if (buf[i])
state = 7;
else
state >>= 1; // 2->1, 1->0, 0->0
} else if (state <= 5) {
int nalu_type = buf[i] & 0x1F;
if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
if (pc->frame_start_found) {
i++;
goto found;
}
} else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
nalu_type == H264_NAL_IDR_SLICE) {
state += 8;
continue;
}
state = 7;
} else {
unsigned int mb, last_mb = p->parse_last_mb;
GetBitContext gb;
p->parse_history[p->parse_history_count++] = buf[i];
init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
mb= get_ue_golomb_long(&gb);
if (get_bits_left(&gb) > 0 || p->parse_history_count > 5) {
p->parse_last_mb = mb;
if (pc->frame_start_found) {
if (mb <= last_mb) {
i -= p->parse_history_count - 1;
p->parse_history_count = 0;
goto found;
}
} else
pc->frame_start_found = 1;
p->parse_history_count = 0;
state = 7;
}
}
}
pc->state = state;
if (p->is_avc)
return next_avc;
return END_NOT_FOUND;
found:
pc->state = 7;
pc->frame_start_found = 0;
if (p->is_avc)
return next_avc;
return i - (state & 5);
}
static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
void *logctx)
{
H264PredWeightTable pwt;
int slice_type_nos = s->pict_type & 3;
H264ParseContext *p = s->priv_data;
int list_count, ref_count[2];
if (p->ps.pps->redundant_pic_cnt_present)
get_ue_golomb(gb); // redundant_pic_count
if (slice_type_nos == AV_PICTURE_TYPE_B)
get_bits1(gb); // direct_spatial_mv_pred
if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
slice_type_nos, p->picture_structure, logctx) < 0)
return AVERROR_INVALIDDATA;
if (slice_type_nos != AV_PICTURE_TYPE_I) {
int list;
for (list = 0; list < list_count; list++) {
if (get_bits1(gb)) {
int index;
for (index = 0; ; index++) {
unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
if (reordering_of_pic_nums_idc < 3)
get_ue_golomb_long(gb);
else if (reordering_of_pic_nums_idc > 3) {
av_log(logctx, AV_LOG_ERROR,
"illegal reordering_of_pic_nums_idc %d\n",
reordering_of_pic_nums_idc);
return AVERROR_INVALIDDATA;
} else
break;
if (index >= ref_count[list]) {
av_log(logctx, AV_LOG_ERROR,
"reference count %d overflow\n", index);
return AVERROR_INVALIDDATA;
}
}
}
}
}
if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
(p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
&pwt, p->picture_structure, logctx);
if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
int i;
for (i = 0; i < H264_MAX_MMCO_COUNT; i++) {
MMCOOpcode opcode = get_ue_golomb_31(gb);
if (opcode > (unsigned) MMCO_LONG) {
av_log(logctx, AV_LOG_ERROR,
"illegal memory management control operation %d\n",
opcode);
return AVERROR_INVALIDDATA;
}
if (opcode == MMCO_END)
return 0;
else if (opcode == MMCO_RESET)
return 1;
if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
get_ue_golomb_31(gb);
}
}
return 0;
}
/**
* Parse NAL units of found picture and decode some basic information.
*
* @param s parser context.
* @param avctx codec context.
* @param buf buffer with field/frame data.
* @param buf_size size of the buffer.
*/
static inline int parse_nal_units(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t * const buf, int buf_size)
{
H264ParseContext *p = s->priv_data;
H2645RBSP rbsp = { NULL };
H2645NAL nal = { NULL };
int buf_index, next_avc;
unsigned int pps_id;
unsigned int slice_type;
int state = -1, got_reset = 0;
int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
int field_poc[2];
int ret;
/* set some sane default values */
s->pict_type = AV_PICTURE_TYPE_I;
s->key_frame = 0;
s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
ff_h264_sei_uninit(&p->sei);
p->sei.frame_packing.arrangement_cancel_flag = -1;
p->sei.unregistered.x264_build = -1;
if (!buf_size)
return 0;
av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
if (!rbsp.rbsp_buffer)
return AVERROR(ENOMEM);
buf_index = 0;
next_avc = p->is_avc ? 0 : buf_size;
for (;;) {
const SPS *sps;
int src_length, consumed, nalsize = 0;
if (buf_index >= next_avc) {
nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
if (nalsize < 0)
break;
next_avc = buf_index + nalsize;
} else {
buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
if (buf_index >= buf_size)
break;
if (buf_index >= next_avc)
continue;
}
src_length = next_avc - buf_index;
state = buf[buf_index];
switch (state & 0x1f) {
case H264_NAL_SLICE:
case H264_NAL_IDR_SLICE:
// Do not walk the whole buffer just to decode slice header
if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
/* IDR or disposable slice
* No need to decode many bytes because MMCOs shall not be present. */
if (src_length > 60)
src_length = 60;
} else {
/* To decode up to MMCOs */
if (src_length > 1000)
src_length = 1000;
}
break;
}
consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
if (consumed < 0)
break;
buf_index += consumed;
ret = init_get_bits8(&nal.gb, nal.data, nal.size);
if (ret < 0)
goto fail;
get_bits1(&nal.gb);
nal.ref_idc = get_bits(&nal.gb, 2);
nal.type = get_bits(&nal.gb, 5);
switch (nal.type) {
case H264_NAL_SPS:
ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
break;
case H264_NAL_PPS:
ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
nal.size_bits);
break;
case H264_NAL_SEI:
ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
break;
case H264_NAL_IDR_SLICE:
s->key_frame = 1;
p->poc.prev_frame_num = 0;
p->poc.prev_frame_num_offset = 0;
p->poc.prev_poc_msb =
p->poc.prev_poc_lsb = 0;
/* fall through */
case H264_NAL_SLICE:
get_ue_golomb_long(&nal.gb); // skip first_mb_in_slice
slice_type = get_ue_golomb_31(&nal.gb);
s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
/* key frame, since recovery_frame_cnt is set */
s->key_frame = 1;
}
pps_id = get_ue_golomb(&nal.gb);
if (pps_id >= MAX_PPS_COUNT) {
av_log(avctx, AV_LOG_ERROR,
"pps_id %u out of range\n", pps_id);
goto fail;
}
if (!p->ps.pps_list[pps_id]) {
av_log(avctx, AV_LOG_ERROR,
"non-existing PPS %u referenced\n", pps_id);
goto fail;
}
av_buffer_unref(&p->ps.pps_ref);
p->ps.pps = NULL;
p->ps.sps = NULL;
p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
if (!p->ps.pps_ref)
goto fail;
p->ps.pps = (const PPS*)p->ps.pps_ref->data;
p->ps.sps = p->ps.pps->sps;
sps = p->ps.sps;
// heuristic to detect non marked keyframes
if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
s->key_frame = 1;
p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
s->coded_width = 16 * sps->mb_width;
s->coded_height = 16 * sps->mb_height;
s->width = s->coded_width - (sps->crop_right + sps->crop_left);
s->height = s->coded_height - (sps->crop_top + sps->crop_bottom);
if (s->width <= 0 || s->height <= 0) {
s->width = s->coded_width;
s->height = s->coded_height;
}
switch (sps->bit_depth_luma) {
case 9:
if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P9;
else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
else s->format = AV_PIX_FMT_YUV420P9;
break;
case 10:
if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P10;
else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
else s->format = AV_PIX_FMT_YUV420P10;
break;
case 8:
if (sps->chroma_format_idc == 3) s->format = AV_PIX_FMT_YUV444P;
else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
else s->format = AV_PIX_FMT_YUV420P;
break;
default:
s->format = AV_PIX_FMT_NONE;
}
avctx->profile = ff_h264_get_profile(sps);
avctx->level = sps->level_idc;
if (sps->frame_mbs_only_flag) {
p->picture_structure = PICT_FRAME;
} else {
if (get_bits1(&nal.gb)) { // field_pic_flag
p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
} else {
p->picture_structure = PICT_FRAME;
}
}
if (nal.type == H264_NAL_IDR_SLICE)
get_ue_golomb_long(&nal.gb); /* idr_pic_id */
if (sps->poc_type == 0) {
p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
if (p->ps.pps->pic_order_present == 1 &&
p->picture_structure == PICT_FRAME)
p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
}
if (sps->poc_type == 1 &&
!sps->delta_pic_order_always_zero_flag) {
p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
if (p->ps.pps->pic_order_present == 1 &&
p->picture_structure == PICT_FRAME)
p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
}
/* Decode POC of this picture.
* The prev_ values needed for decoding POC of the next picture are not set here. */
field_poc[0] = field_poc[1] = INT_MAX;
ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
&p->poc, p->picture_structure, nal.ref_idc);
if (ret < 0)
goto fail;
/* Continue parsing to check if MMCO_RESET is present.
* FIXME: MMCO_RESET could appear in non-first slice.
* Maybe, we should parse all undisposable non-IDR slice of this
* picture until encountering MMCO_RESET in a slice of it. */
if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
got_reset = scan_mmco_reset(s, &nal.gb, avctx);
if (got_reset < 0)
goto fail;
}
/* Set up the prev_ values for decoding POC of the next picture. */
p->poc.prev_frame_num = got_reset ? 0 : p->poc.frame_num;
p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
if (nal.ref_idc != 0) {
if (!got_reset) {
p->poc.prev_poc_msb = p->poc.poc_msb;
p->poc.prev_poc_lsb = p->poc.poc_lsb;
} else {
p->poc.prev_poc_msb = 0;
p->poc.prev_poc_lsb =
p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
}
}
if (p->sei.picture_timing.present) {
ret = ff_h264_sei_process_picture_timing(&p->sei.picture_timing,
sps, avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error processing the picture timing SEI\n");
p->sei.picture_timing.present = 0;
}
}
if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
switch (p->sei.picture_timing.pic_struct) {
case H264_SEI_PIC_STRUCT_TOP_FIELD:
case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
s->repeat_pict = 0;
break;
case H264_SEI_PIC_STRUCT_FRAME:
case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
s->repeat_pict = 1;
break;
case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
s->repeat_pict = 2;
break;
case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
s->repeat_pict = 3;
break;
case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
s->repeat_pict = 5;
break;
default:
s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
break;
}
} else {
s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
}
if (p->picture_structure == PICT_FRAME) {
s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
switch (p->sei.picture_timing.pic_struct) {
case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
s->field_order = AV_FIELD_TT;
break;
case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
s->field_order = AV_FIELD_BB;
break;
default:
s->field_order = AV_FIELD_PROGRESSIVE;
break;
}
} else {
if (field_poc[0] < field_poc[1])
s->field_order = AV_FIELD_TT;
else if (field_poc[0] > field_poc[1])
s->field_order = AV_FIELD_BB;
else
s->field_order = AV_FIELD_PROGRESSIVE;
}
} else {
if (p->picture_structure == PICT_TOP_FIELD)
s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
else
s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
if (p->poc.frame_num == p->last_frame_num &&
p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
p->last_picture_structure != s->picture_structure) {
if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
s->field_order = AV_FIELD_TT;
else
s->field_order = AV_FIELD_BB;
} else {
s->field_order = AV_FIELD_UNKNOWN;
}
p->last_picture_structure = s->picture_structure;
p->last_frame_num = p->poc.frame_num;
}
if (sps->timing_info_present_flag) {
int64_t den = sps->time_scale;
if (p->sei.unregistered.x264_build < 44U)
den *= 2;
av_reduce(&avctx->framerate.den, &avctx->framerate.num,
sps->num_units_in_tick * avctx->ticks_per_frame, den, 1 << 30);
}
av_freep(&rbsp.rbsp_buffer);
return 0; /* no need to evaluate the rest */
}
}
if (q264) {
av_freep(&rbsp.rbsp_buffer);
return 0;
}
/* didn't find a picture! */
av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
fail:
av_freep(&rbsp.rbsp_buffer);
return -1;
}
static int h264_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
H264ParseContext *p = s->priv_data;
ParseContext *pc = &p->pc;
int next;
if (!p->got_first) {
p->got_first = 1;
if (avctx->extradata_size) {
ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
&p->ps, &p->is_avc, &p->nal_length_size,
avctx->err_recognition, avctx);
}
}
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
} else {
next = h264_find_frame_end(p, buf, buf_size, avctx);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
if (next < 0 && next != END_NOT_FOUND) {
av_assert1(pc->last_index + next >= 0);
h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
}
}
parse_nal_units(s, avctx, buf, buf_size);
if (avctx->framerate.num)
avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
if (p->sei.picture_timing.cpb_removal_delay >= 0) {
s->dts_sync_point = p->sei.buffering_period.present;
s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
s->pts_dts_delta = p->sei.picture_timing.dpb_output_delay;
} else {
s->dts_sync_point = INT_MIN;
s->dts_ref_dts_delta = INT_MIN;
s->pts_dts_delta = INT_MIN;
}
if (s->flags & PARSER_FLAG_ONCE) {
s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
}
if (s->dts_sync_point >= 0) {
int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
if (den > 0) {
int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
if (s->dts != AV_NOPTS_VALUE) {
// got DTS from the stream, update reference timestamp
p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
} else if (p->reference_dts != AV_NOPTS_VALUE) {
// compute DTS based on reference timestamp
s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
}
if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
if (s->dts_sync_point > 0)
p->reference_dts = s->dts; // new reference
}
}
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
static void h264_close(AVCodecParserContext *s)
{
H264ParseContext *p = s->priv_data;
ParseContext *pc = &p->pc;
av_freep(&pc->buffer);
ff_h264_sei_uninit(&p->sei);
ff_h264_ps_uninit(&p->ps);
}
static av_cold int init(AVCodecParserContext *s)
{
H264ParseContext *p = s->priv_data;
p->reference_dts = AV_NOPTS_VALUE;
p->last_frame_num = INT_MAX;
ff_h264dsp_init(&p->h264dsp, 8, 1);
return 0;
}
const AVCodecParser ff_h264_parser = {
.codec_ids = { AV_CODEC_ID_H264 },
.priv_data_size = sizeof(H264ParseContext),
.parser_init = init,
.parser_parse = h264_parse,
.parser_close = h264_close,
};
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