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https://github.com/FFmpeg/FFmpeg.git
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8e207bf463
It is accessed via AV_RN64A in ff_simple_idct_put_int32_10bit(). Should fix the UBSan failures in the mpeg4-simple-studio-profile test here: https://fate.ffmpeg.org/report.cgi?time=20240312011016&slot=ppc-linux-gcc-13.2-ubsan-altivec-qemu Reviewed-by: Kieran Kunhya <kierank@obe.tv> Tested-by: Sean McGovern <gseanmcg@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/*
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* MPEG-4 decoder internal header.
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* Copyright (c) 2000,2001 Fabrice Bellard
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* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_MPEG4VIDEODEC_H
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#define AVCODEC_MPEG4VIDEODEC_H
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#include <stdint.h>
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#include "get_bits.h"
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#include "mpegvideo.h"
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#include "mpeg4videodsp.h"
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#include "libavutil/mem_internal.h"
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typedef struct Mpeg4DecContext {
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MpegEncContext m;
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/// number of bits to represent the fractional part of time
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int time_increment_bits;
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int shape;
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int vol_sprite_usage;
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int sprite_brightness_change;
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int sprite_warping_accuracy;
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int num_sprite_warping_points;
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int real_sprite_warping_points;
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int sprite_offset[2][2]; ///< sprite offset[isChroma][isMVY]
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int sprite_delta[2][2]; ///< sprite_delta [isY][isMVY]
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/// sprite trajectory points
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uint16_t sprite_traj[4][2];
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/// sprite shift [isChroma]
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int sprite_shift[2];
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// reversible vlc
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int rvlc;
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/// could this stream contain resync markers
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int resync_marker;
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/// time distance of first I -> B, used for interlaced B-frames
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int t_frame;
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int new_pred;
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int enhancement_type;
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int scalability;
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/// QP above which the ac VLC should be used for intra dc
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int intra_dc_threshold;
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/* bug workarounds */
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int divx_version;
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int divx_build;
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int xvid_build;
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int lavc_build;
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int vo_type;
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/// flag for having shown the warning about invalid Divx B-frames
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int showed_packed_warning;
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/** does the stream contain the low_delay flag,
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* used to work around buggy encoders. */
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int vol_control_parameters;
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int cplx_estimation_trash_i;
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int cplx_estimation_trash_p;
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int cplx_estimation_trash_b;
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int rgb;
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Mpeg4VideoDSPContext mdsp;
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DECLARE_ALIGNED(8, int32_t, block32)[12][64];
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// 0 = DCT, 1 = DPCM top to bottom scan, -1 = DPCM bottom to top scan
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int dpcm_direction;
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int16_t dpcm_macroblock[3][256];
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} Mpeg4DecContext;
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int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb,
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int header, int parse_only);
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void ff_mpeg4_decode_studio(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb,
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uint8_t *dest_cr, int block_size, int uvlinesize,
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int dct_linesize, int dct_offset);
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void ff_mpeg4_mcsel_motion(MpegEncContext *s,
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uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
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uint8_t *const *ref_picture);
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int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
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int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
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int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx);
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int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
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void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
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int dir);
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int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
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#endif
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