2 * Float MPEG Audio decoder
3 * Copyright (c) 2010 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/samplefmt.h"
27 #include "mpegaudio.h"
29 #define SHR(a,b) ((a)*(1.0f/(1<<(b))))
30 #define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5))
31 #define FIXR(x) ((float)(x))
32 #define FIXHR(x) ((float)(x))
33 #define MULH3(x, y, s) ((s)*(y)*(x))
34 #define MULLx(x, y, s) ((y)*(x))
35 #define RENAME(a) a ## _float
36 #define OUT_FMT AV_SAMPLE_FMT_FLT
37 #define OUT_FMT_P AV_SAMPLE_FMT_FLTP
39 /* Intensity stereo table. See commit b91d46614df189e7905538e7f5c4ed9c7ed0d274
40 * (float based mp1/mp2/mp3 decoders.) for how they were created. */
41 static const float is_table[2][16] = {
42 { 0.000000000000000000e+00, 2.113248705863952637e-01, 3.660253882408142090e-01,
43 5.000000000000000000e-01, 6.339746117591857910e-01, 7.886751294136047363e-01,
44 1.000000000000000000e+00 },
45 { 1.000000000000000000e+00, 7.886751294136047363e-01, 6.339746117591857910e-01,
46 5.000000000000000000e-01, 3.660253882408142090e-01, 2.113248705863952637e-01,
47 0.000000000000000000e+00 }
50 /* Antialiasing table. See commit 6f1ec38ce2193d3d4cacd87edb452c6d7ba751ec
51 * (mpegaudio: clean up compute_antialias() definition) for how they were
53 static const float csa_table[8][4] = {
54 { 8.574929237365722656e-01, -5.144957900047302246e-01,
55 3.429971337318420410e-01, -1.371988654136657715e+00 },
56 { 8.817420005798339844e-01, -4.717319905757904053e-01,
57 4.100100100040435791e-01, -1.353474020957946777e+00 },
58 { 9.496286511421203613e-01, -3.133774697780609131e-01,
59 6.362511515617370605e-01, -1.263006091117858887e+00 },
60 { 9.833145737648010254e-01, -1.819131970405578613e-01,
61 8.014013767242431641e-01, -1.165227770805358887e+00 },
62 { 9.955177903175354004e-01, -9.457419067621231079e-02,
63 9.009436368942260742e-01, -1.090092062950134277e+00 },
64 { 9.991605877876281738e-01, -4.096558317542076111e-02,
65 9.581949710845947266e-01, -1.040126085281372070e+00 },
66 { 9.998992085456848145e-01, -1.419856864959001541e-02,
67 9.857006072998046875e-01, -1.014097809791564941e+00 },
68 { 9.999931454658508301e-01, -3.699974622577428818e-03,
69 9.962931871414184570e-01, -1.003693103790283203e+00 }
72 #include "mpegaudiodec_template.c"
74 #if CONFIG_MP1FLOAT_DECODER
75 const AVCodec ff_mp1float_decoder = {
77 .long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
78 .type = AVMEDIA_TYPE_AUDIO,
79 .id = AV_CODEC_ID_MP1,
80 .priv_data_size = sizeof(MPADecodeContext),
82 .decode = decode_frame,
83 .capabilities = AV_CODEC_CAP_CHANNEL_CONF |
86 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
89 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
92 #if CONFIG_MP2FLOAT_DECODER
93 const AVCodec ff_mp2float_decoder = {
95 .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
96 .type = AVMEDIA_TYPE_AUDIO,
97 .id = AV_CODEC_ID_MP2,
98 .priv_data_size = sizeof(MPADecodeContext),
100 .decode = decode_frame,
101 .capabilities = AV_CODEC_CAP_CHANNEL_CONF |
104 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
106 AV_SAMPLE_FMT_NONE },
107 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
110 #if CONFIG_MP3FLOAT_DECODER
111 const AVCodec ff_mp3float_decoder = {
113 .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
114 .type = AVMEDIA_TYPE_AUDIO,
115 .id = AV_CODEC_ID_MP3,
116 .priv_data_size = sizeof(MPADecodeContext),
118 .decode = decode_frame,
119 .capabilities = AV_CODEC_CAP_CHANNEL_CONF |
122 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
124 AV_SAMPLE_FMT_NONE },
125 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
128 #if CONFIG_MP3ADUFLOAT_DECODER
129 const AVCodec ff_mp3adufloat_decoder = {
130 .name = "mp3adufloat",
131 .long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
132 .type = AVMEDIA_TYPE_AUDIO,
133 .id = AV_CODEC_ID_MP3ADU,
134 .priv_data_size = sizeof(MPADecodeContext),
136 .decode = decode_frame_adu,
137 .capabilities = AV_CODEC_CAP_CHANNEL_CONF |
140 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
142 AV_SAMPLE_FMT_NONE },
143 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
146 #if CONFIG_MP3ON4FLOAT_DECODER
147 const AVCodec ff_mp3on4float_decoder = {
148 .name = "mp3on4float",
149 .long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"),
150 .type = AVMEDIA_TYPE_AUDIO,
151 .id = AV_CODEC_ID_MP3ON4,
152 .priv_data_size = sizeof(MP3On4DecodeContext),
153 .init = decode_init_mp3on4,
154 .close = decode_close_mp3on4,
155 .decode = decode_frame_mp3on4,
156 .capabilities = AV_CODEC_CAP_CHANNEL_CONF |
158 .flush = flush_mp3on4,
159 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
160 AV_SAMPLE_FMT_NONE },
161 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,