mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
b3332a182f
These 2 fields are not always the same, it is simpler to always use the same field for detecting studio profile Fixes: null pointer dereference Fixes: ffmpeg_crash_3.avi Found-by: Thuan Pham <thuanpv@comp.nus.edu.sg>, Marcel Böhme, Andrew Santosa and Alexandru RazvanCaciulescu with AFLSmart Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
123 lines
4.7 KiB
C
123 lines
4.7 KiB
C
/*
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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_IDCTDSP_H
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#define AVCODEC_IDCTDSP_H
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#include <stdint.h>
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#include "config.h"
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#include "avcodec.h"
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/**
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* Scantable.
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*/
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typedef struct ScanTable {
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const uint8_t *scantable;
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uint8_t permutated[64];
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uint8_t raster_end[64];
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} ScanTable;
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enum idct_permutation_type {
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FF_IDCT_PERM_NONE,
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FF_IDCT_PERM_LIBMPEG2,
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FF_IDCT_PERM_SIMPLE,
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FF_IDCT_PERM_TRANSPOSE,
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FF_IDCT_PERM_PARTTRANS,
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FF_IDCT_PERM_SSE2,
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};
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void ff_init_scantable(uint8_t *permutation, ScanTable *st,
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const uint8_t *src_scantable);
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void ff_init_scantable_permutation(uint8_t *idct_permutation,
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enum idct_permutation_type perm_type);
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int ff_init_scantable_permutation_x86(uint8_t *idct_permutation,
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enum idct_permutation_type perm_type);
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typedef struct IDCTDSPContext {
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/* pixel ops : interface with DCT */
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void (*put_pixels_clamped)(const int16_t *block /* align 16 */,
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uint8_t *av_restrict pixels /* align 8 */,
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ptrdiff_t line_size);
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void (*put_signed_pixels_clamped)(const int16_t *block /* align 16 */,
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uint8_t *av_restrict pixels /* align 8 */,
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ptrdiff_t line_size);
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void (*add_pixels_clamped)(const int16_t *block /* align 16 */,
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uint8_t *av_restrict pixels /* align 8 */,
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ptrdiff_t line_size);
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void (*idct)(int16_t *block /* align 16 */);
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/**
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* block -> idct -> clip to unsigned 8 bit -> dest.
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* (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...)
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* @param line_size size in bytes of a horizontal line of dest
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*/
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void (*idct_put)(uint8_t *dest /* align 8 */,
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ptrdiff_t line_size, int16_t *block /* align 16 */);
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/**
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* block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
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* @param line_size size in bytes of a horizontal line of dest
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*/
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void (*idct_add)(uint8_t *dest /* align 8 */,
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ptrdiff_t line_size, int16_t *block /* align 16 */);
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/**
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* IDCT input permutation.
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* Several optimized IDCTs need a permutated input (relative to the
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* normal order of the reference IDCT).
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* This permutation must be performed before the idct_put/add.
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* Note, normally this can be merged with the zigzag/alternate scan<br>
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* An example to avoid confusion:
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* - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...)
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* - (x -> reference DCT -> reference IDCT -> x)
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* - (x -> reference DCT -> simple_mmx_perm = idct_permutation
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* -> simple_idct_mmx -> x)
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* - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant
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* -> simple_idct_mmx -> ...)
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*/
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uint8_t idct_permutation[64];
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enum idct_permutation_type perm_type;
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int mpeg4_studio_profile;
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} IDCTDSPContext;
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void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
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ptrdiff_t line_size);
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void ff_add_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
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ptrdiff_t line_size);
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void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx);
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void ff_idctdsp_init_aarch64(IDCTDSPContext *c, AVCodecContext *avctx,
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unsigned high_bit_depth);
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void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx,
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unsigned high_bit_depth);
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void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx,
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unsigned high_bit_depth);
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void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx,
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unsigned high_bit_depth);
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void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx,
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unsigned high_bit_depth);
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void ff_idctdsp_init_mips(IDCTDSPContext *c, AVCodecContext *avctx,
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unsigned high_bit_depth);
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#endif /* AVCODEC_IDCTDSP_H */
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