FFmpeg
alacdsp_init.c
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1 /*
2  * Copyright © 2022 Rémi Denis-Courmont.
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdint.h>
22 
23 #include "libavutil/attributes.h"
24 #include "libavutil/cpu.h"
25 #include "libavcodec/avcodec.h"
26 #include "libavcodec/alacdsp.h"
27 
28 void ff_alac_decorrelate_stereo_rvv(int32_t *buffer[2], int nb_samples,
29  int decorr_shift, int decorr_left_weight);
31  int32_t *extra_bits_buf[2],
32  int extra_bits, int channels,
33  int nb_samples);
35  int32_t *extra_bits_buf[2],
36  int extra_bits, int channels,
37  int nb_samples);
38 
40 {
41 #if HAVE_RVV && (__riscv_xlen == 64)
42  int flags = av_get_cpu_flags();
43 
44  if (flags & AV_CPU_FLAG_RVV_I32) {
45  c->decorrelate_stereo = ff_alac_decorrelate_stereo_rvv;
46  c->append_extra_bits[0] = ff_alac_append_extra_bits_mono_rvv;
47  c->append_extra_bits[1] = ff_alac_append_extra_bits_stereo_rvv;
48  }
49 #endif
50 }
extra_bits
#define extra_bits(eb)
Definition: intrax8.c:125
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:103
alacdsp.h
ff_alac_append_extra_bits_mono_rvv
void ff_alac_append_extra_bits_mono_rvv(int32_t *buffer[2], int32_t *extra_bits_buf[2], int extra_bits, int channels, int nb_samples)
av_cold
#define av_cold
Definition: attributes.h:90
channels
channels
Definition: aptx.h:31
ff_alac_append_extra_bits_stereo_rvv
void ff_alac_append_extra_bits_stereo_rvv(int32_t *buffer[2], int32_t *extra_bits_buf[2], int extra_bits, int channels, int nb_samples)
ALACDSPContext
Definition: alacdsp.h:24
c
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
cpu.h
attributes.h
ff_alac_decorrelate_stereo_rvv
void ff_alac_decorrelate_stereo_rvv(int32_t *buffer[2], int nb_samples, int decorr_shift, int decorr_left_weight)
AV_CPU_FLAG_RVV_I32
#define AV_CPU_FLAG_RVV_I32
Vectors of 8/16/32-bit int's *‍/.
Definition: cpu.h:85
avcodec.h
ff_alacdsp_init_riscv
av_cold void ff_alacdsp_init_riscv(ALACDSPContext *c)
Definition: alacdsp_init.c:39
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
int32_t
int32_t
Definition: audioconvert.c:56
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561