mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-30 03:12:08 +00:00
ac4e3e188a
Fixes: out of array access Fixes: 62467/clusterfuzz-testcase-minimized-ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-6092990982258688 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: "Dawid Kozinski/Multimedia (PLT) /SRPOL/Staff Engineer/Samsung Electronics" <d.kozinski@samsung.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
215 lines
8.0 KiB
C
215 lines
8.0 KiB
C
/*
|
|
* 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 "golomb.h"
|
|
#include "evc.h"
|
|
#include "evc_parse.h"
|
|
|
|
// @see ISO_IEC_23094-1 (7.3.2.6 Slice layer RBSP syntax)
|
|
int ff_evc_parse_slice_header(GetBitContext *gb, EVCParserSliceHeader *sh,
|
|
const EVCParamSets *ps, enum EVCNALUnitType nalu_type)
|
|
{
|
|
const EVCParserPPS *pps;
|
|
const EVCParserSPS *sps;
|
|
int num_tiles_in_slice = 0;
|
|
unsigned slice_pic_parameter_set_id;
|
|
|
|
slice_pic_parameter_set_id = get_ue_golomb_31(gb);
|
|
|
|
if (slice_pic_parameter_set_id >= EVC_MAX_PPS_COUNT)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
pps = ps->pps[slice_pic_parameter_set_id];
|
|
if(!pps)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
sps = ps->sps[pps->pps_seq_parameter_set_id];
|
|
if(!sps)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
memset(sh, 0, sizeof(*sh));
|
|
sh->slice_pic_parameter_set_id = slice_pic_parameter_set_id;
|
|
|
|
if (!pps->single_tile_in_pic_flag) {
|
|
sh->single_tile_in_slice_flag = get_bits1(gb);
|
|
sh->first_tile_id = get_bits(gb, pps->tile_id_len_minus1 + 1);
|
|
} else
|
|
sh->single_tile_in_slice_flag = 1;
|
|
|
|
if (!sh->single_tile_in_slice_flag) {
|
|
if (pps->arbitrary_slice_present_flag)
|
|
sh->arbitrary_slice_flag = get_bits1(gb);
|
|
|
|
if (!sh->arbitrary_slice_flag)
|
|
sh->last_tile_id = get_bits(gb, pps->tile_id_len_minus1 + 1);
|
|
else {
|
|
unsigned num_remaining_tiles_in_slice_minus1 = get_ue_golomb_long(gb);
|
|
if (num_remaining_tiles_in_slice_minus1 > EVC_MAX_TILE_ROWS * EVC_MAX_TILE_COLUMNS - 2)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
num_tiles_in_slice = num_remaining_tiles_in_slice_minus1 + 2;
|
|
sh->num_remaining_tiles_in_slice_minus1 = num_remaining_tiles_in_slice_minus1;
|
|
for (int i = 0; i < num_tiles_in_slice - 1; ++i)
|
|
sh->delta_tile_id_minus1[i] = get_ue_golomb_long(gb);
|
|
}
|
|
}
|
|
|
|
sh->slice_type = get_ue_golomb_31(gb);
|
|
|
|
if (nalu_type == EVC_IDR_NUT)
|
|
sh->no_output_of_prior_pics_flag = get_bits1(gb);
|
|
|
|
if (sps->sps_mmvd_flag && ((sh->slice_type == EVC_SLICE_TYPE_B) || (sh->slice_type == EVC_SLICE_TYPE_P)))
|
|
sh->mmvd_group_enable_flag = get_bits1(gb);
|
|
else
|
|
sh->mmvd_group_enable_flag = 0;
|
|
|
|
if (sps->sps_alf_flag) {
|
|
int ChromaArrayType = sps->chroma_format_idc;
|
|
|
|
sh->slice_alf_enabled_flag = get_bits1(gb);
|
|
|
|
if (sh->slice_alf_enabled_flag) {
|
|
sh->slice_alf_luma_aps_id = get_bits(gb, 5);
|
|
sh->slice_alf_map_flag = get_bits1(gb);
|
|
sh->slice_alf_chroma_idc = get_bits(gb, 2);
|
|
|
|
if ((ChromaArrayType == 1 || ChromaArrayType == 2) && sh->slice_alf_chroma_idc > 0)
|
|
sh->slice_alf_chroma_aps_id = get_bits(gb, 5);
|
|
}
|
|
if (ChromaArrayType == 3) {
|
|
int sliceChromaAlfEnabledFlag = 0;
|
|
int sliceChroma2AlfEnabledFlag = 0;
|
|
|
|
if (sh->slice_alf_chroma_idc == 1) { // @see ISO_IEC_23094-1 (7.4.5)
|
|
sliceChromaAlfEnabledFlag = 1;
|
|
sliceChroma2AlfEnabledFlag = 0;
|
|
} else if (sh->slice_alf_chroma_idc == 2) {
|
|
sliceChromaAlfEnabledFlag = 0;
|
|
sliceChroma2AlfEnabledFlag = 1;
|
|
} else if (sh->slice_alf_chroma_idc == 3) {
|
|
sliceChromaAlfEnabledFlag = 1;
|
|
sliceChroma2AlfEnabledFlag = 1;
|
|
} else {
|
|
sliceChromaAlfEnabledFlag = 0;
|
|
sliceChroma2AlfEnabledFlag = 0;
|
|
}
|
|
|
|
if (!sh->slice_alf_enabled_flag)
|
|
sh->slice_alf_chroma_idc = get_bits(gb, 2);
|
|
|
|
if (sliceChromaAlfEnabledFlag) {
|
|
sh->slice_alf_chroma_aps_id = get_bits(gb, 5);
|
|
sh->slice_alf_chroma_map_flag = get_bits1(gb);
|
|
}
|
|
|
|
if (sliceChroma2AlfEnabledFlag) {
|
|
sh->slice_alf_chroma2_aps_id = get_bits(gb, 5);
|
|
sh->slice_alf_chroma2_map_flag = get_bits1(gb);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (nalu_type != EVC_IDR_NUT) {
|
|
if (sps->sps_pocs_flag)
|
|
sh->slice_pic_order_cnt_lsb = get_bits(gb, sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
|
|
}
|
|
|
|
// @note
|
|
// If necessary, add the missing fields to the EVCParserSliceHeader structure
|
|
// and then extend parser implementation
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ff_evc_derive_poc(const EVCParamSets *ps, const EVCParserSliceHeader *sh,
|
|
EVCParserPoc *poc, enum EVCNALUnitType nalu_type, int tid)
|
|
{
|
|
const EVCParserPPS *pps = ps->pps[sh->slice_pic_parameter_set_id];
|
|
const EVCParserSPS *sps;
|
|
|
|
if (!pps)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
sps = ps->sps[pps->pps_seq_parameter_set_id];
|
|
if (!sps)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (sps->sps_pocs_flag) {
|
|
int PicOrderCntMsb = 0;
|
|
poc->prevPicOrderCntVal = poc->PicOrderCntVal;
|
|
|
|
if (nalu_type == EVC_IDR_NUT)
|
|
PicOrderCntMsb = 0;
|
|
else {
|
|
int MaxPicOrderCntLsb = 1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
|
|
int prevPicOrderCntLsb = poc->PicOrderCntVal & (MaxPicOrderCntLsb - 1);
|
|
int prevPicOrderCntMsb = poc->PicOrderCntVal - prevPicOrderCntLsb;
|
|
|
|
if ((sh->slice_pic_order_cnt_lsb < prevPicOrderCntLsb) &&
|
|
((prevPicOrderCntLsb - sh->slice_pic_order_cnt_lsb) >= (MaxPicOrderCntLsb / 2)))
|
|
PicOrderCntMsb = prevPicOrderCntMsb + MaxPicOrderCntLsb;
|
|
else if ((sh->slice_pic_order_cnt_lsb > prevPicOrderCntLsb) &&
|
|
((sh->slice_pic_order_cnt_lsb - prevPicOrderCntLsb) > (MaxPicOrderCntLsb / 2)))
|
|
PicOrderCntMsb = prevPicOrderCntMsb - MaxPicOrderCntLsb;
|
|
else
|
|
PicOrderCntMsb = prevPicOrderCntMsb;
|
|
}
|
|
poc->PicOrderCntVal = PicOrderCntMsb + sh->slice_pic_order_cnt_lsb;
|
|
} else {
|
|
if (nalu_type == EVC_IDR_NUT) {
|
|
poc->PicOrderCntVal = 0;
|
|
poc->DocOffset = -1;
|
|
} else {
|
|
int SubGopLength = 1 << sps->log2_sub_gop_length;
|
|
|
|
if (tid > (SubGopLength > 1 ? 1 + av_log2(SubGopLength - 1) : 0))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (tid == 0) {
|
|
poc->PicOrderCntVal = poc->prevPicOrderCntVal + SubGopLength;
|
|
poc->DocOffset = 0;
|
|
poc->prevPicOrderCntVal = poc->PicOrderCntVal;
|
|
} else {
|
|
int ExpectedTemporalId;
|
|
int PocOffset;
|
|
int prevDocOffset = poc->DocOffset;
|
|
|
|
poc->DocOffset = (prevDocOffset + 1) % SubGopLength;
|
|
if (poc->DocOffset == 0) {
|
|
poc->prevPicOrderCntVal += SubGopLength;
|
|
ExpectedTemporalId = 0;
|
|
} else
|
|
ExpectedTemporalId = 1 + av_log2(poc->DocOffset);
|
|
|
|
while (tid != ExpectedTemporalId) {
|
|
poc->DocOffset = (poc->DocOffset + 1) % SubGopLength;
|
|
if (poc->DocOffset == 0)
|
|
ExpectedTemporalId = 0;
|
|
else
|
|
ExpectedTemporalId = 1 + av_log2(poc->DocOffset);
|
|
}
|
|
PocOffset = (int)(SubGopLength * ((2.0 * poc->DocOffset + 1) / (1 << tid) - 2));
|
|
poc->PicOrderCntVal = poc->prevPicOrderCntVal + PocOffset;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|