path: root/libavcodec/flacdsp.c (plain)
blob: bc9a5dbed916a6bf06236c2401b5e32a164aa7fd

1	/*
2	* Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
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 "libavutil/attributes.h"
22	#include "libavutil/samplefmt.h"
23	#include "flacdsp.h"
24	#include "config.h"
25
26	#define SAMPLE_SIZE 16
27	#define PLANAR 0
28	#include "flacdsp_template.c"
29	#include "flacdsp_lpc_template.c"
30
31	#undef PLANAR
32	#define PLANAR 1
33	#include "flacdsp_template.c"
34
35	#undef SAMPLE_SIZE
36	#undef PLANAR
37	#define SAMPLE_SIZE 32
38	#define PLANAR 0
39	#include "flacdsp_template.c"
40	#include "flacdsp_lpc_template.c"
41
42	#undef PLANAR
43	#define PLANAR 1
44	#include "flacdsp_template.c"
45
46	static void flac_lpc_16_c(int32_t *decoded, const int coeffs[32],
47	int pred_order, int qlevel, int len)
48	{
49	int i, j;
50
51	for (i = pred_order; i < len - 1; i += 2, decoded += 2) {
52	SUINT c = coeffs[0];
53	SUINT d = decoded[0];
54	int s0 = 0, s1 = 0;
55	for (j = 1; j < pred_order; j++) {
56	s0 += c*d;
57	d = decoded[j];
58	s1 += c*d;
59	c = coeffs[j];
60	}
61	s0 += c*d;
62	d = decoded[j] += (SUINT)(s0 >> qlevel);
63	s1 += c*d;
64	decoded[j + 1] += (SUINT)(s1 >> qlevel);
65	}
66	if (i < len) {
67	int sum = 0;
68	for (j = 0; j < pred_order; j++)
69	sum += coeffs[j] * (SUINT)decoded[j];
70	decoded[j] = decoded[j] + (unsigned)(sum >> qlevel);
71	}
72	}
73
74	static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],
75	int pred_order, int qlevel, int len)
76	{
77	int i, j;
78
79	for (i = pred_order; i < len; i++, decoded++) {
80	int64_t sum = 0;
81	for (j = 0; j < pred_order; j++)
82	sum += (int64_t)coeffs[j] * decoded[j];
83	decoded[j] += sum >> qlevel;
84	}
85
86	}
87
88	av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt, int channels,
89	int bps)
90	{
91	c->lpc16 = flac_lpc_16_c;
92	c->lpc32 = flac_lpc_32_c;
93	c->lpc16_encode = flac_lpc_encode_c_16;
94	c->lpc32_encode = flac_lpc_encode_c_32;
95
96	switch (fmt) {
97	case AV_SAMPLE_FMT_S32:
98	c->decorrelate[0] = flac_decorrelate_indep_c_32;
99	c->decorrelate[1] = flac_decorrelate_ls_c_32;
100	c->decorrelate[2] = flac_decorrelate_rs_c_32;
101	c->decorrelate[3] = flac_decorrelate_ms_c_32;
102	break;
103
104	case AV_SAMPLE_FMT_S32P:
105	c->decorrelate[0] = flac_decorrelate_indep_c_32p;
106	c->decorrelate[1] = flac_decorrelate_ls_c_32p;
107	c->decorrelate[2] = flac_decorrelate_rs_c_32p;
108	c->decorrelate[3] = flac_decorrelate_ms_c_32p;
109	break;
110
111	case AV_SAMPLE_FMT_S16:
112	c->decorrelate[0] = flac_decorrelate_indep_c_16;
113	c->decorrelate[1] = flac_decorrelate_ls_c_16;
114	c->decorrelate[2] = flac_decorrelate_rs_c_16;
115	c->decorrelate[3] = flac_decorrelate_ms_c_16;
116	break;
117
118	case AV_SAMPLE_FMT_S16P:
119	c->decorrelate[0] = flac_decorrelate_indep_c_16p;
120	c->decorrelate[1] = flac_decorrelate_ls_c_16p;
121	c->decorrelate[2] = flac_decorrelate_rs_c_16p;
122	c->decorrelate[3] = flac_decorrelate_ms_c_16p;
123	break;
124	}
125
126	if (ARCH_ARM)
127	ff_flacdsp_init_arm(c, fmt, channels, bps);
128	if (ARCH_X86)
129	ff_flacdsp_init_x86(c, fmt, channels, bps);
130	}
131