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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
19 #include "libavutil/attributes.h"
20 #include "avcodec.h"
21 #include "dct.h"
22 #include "faandct.h"
23 #include "fdctdsp.h"
24 #include "config.h"
27 {
28  const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
30  if (avctx->bits_per_raw_sample == 10 || avctx->bits_per_raw_sample == 9) {
33  } else if (avctx->dct_algo == FF_DCT_FASTINT) {
34  c->fdct = ff_fdct_ifast;
37  } else if (avctx->dct_algo == FF_DCT_FAAN) {
38  c->fdct = ff_faandct;
40 #endif /* CONFIG_FAANDCT */
41  } else {
42  c->fdct = ff_jpeg_fdct_islow_8; // slow/accurate/default
44  }
46  if (ARCH_PPC)
47  ff_fdctdsp_init_ppc(c, avctx, high_bit_depth);
48  if (ARCH_X86)
49  ff_fdctdsp_init_x86(c, avctx, high_bit_depth);
50 }
void ff_jpeg_fdct_islow_10(int16_t *data)
void ff_fdct248_islow_10(int16_t *data)
void ff_fdct_ifast(int16_t *data)
Definition: jfdctfst.c:208
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:1706
void ff_faandct248(int16_t *data)
Definition: faandct.c:168
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1747
#define FF_DCT_FAAN
Definition: avcodec.h:1712
av_cold void ff_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx)
Definition: fdctdsp.c:26
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:88
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
void ff_fdctdsp_init_x86(FDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: fdctdsp_init.c:26
void ff_fdct248_islow_8(int16_t *data)
void(* fdct)(int16_t *block)
Definition: fdctdsp.h:27
void ff_jpeg_fdct_islow_8(int16_t *data)
void ff_faandct(int16_t *data)
Definition: faandct.c:114
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:536
void(* fdct248)(int16_t *block)
Definition: fdctdsp.h:28
void ff_fdct_ifast248(int16_t *data)
Definition: jfdctfst.c:274
av_cold void ff_fdctdsp_init_ppc(FDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: fdctdsp.c:464
Definition: avcodec.h:1708
Floating point AAN DCT