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mpegaudiodec_float.c
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1 /*
2  * Float MPEG Audio decoder
3  * Copyright (c) 2010 Michael Niedermayer
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #include "config.h"
23 #include "libavutil/samplefmt.h"
24 
25 #define USE_FLOATS 1
26 
27 #include "mpegaudio.h"
28 
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
38 
39 #include "mpegaudiodec_template.c"
40 
41 #if CONFIG_MP1FLOAT_DECODER
42 AVCodec ff_mp1float_decoder = {
43  .name = "mp1float",
44  .long_name = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
45  .type = AVMEDIA_TYPE_AUDIO,
46  .id = AV_CODEC_ID_MP1,
47  .priv_data_size = sizeof(MPADecodeContext),
48  .init = decode_init,
49  .close = decode_close,
51  .capabilities = AV_CODEC_CAP_DR1,
52  .flush = flush,
53  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
56 };
57 #endif
58 #if CONFIG_MP2FLOAT_DECODER
59 AVCodec ff_mp2float_decoder = {
60  .name = "mp2float",
61  .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
62  .type = AVMEDIA_TYPE_AUDIO,
63  .id = AV_CODEC_ID_MP2,
64  .priv_data_size = sizeof(MPADecodeContext),
65  .init = decode_init,
67  .close = decode_close,
68  .capabilities = AV_CODEC_CAP_DR1,
69  .flush = flush,
70  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
73 };
74 #endif
75 #if CONFIG_MP3FLOAT_DECODER
76 AVCodec ff_mp3float_decoder = {
77  .name = "mp3float",
78  .long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
79  .type = AVMEDIA_TYPE_AUDIO,
80  .id = AV_CODEC_ID_MP3,
81  .priv_data_size = sizeof(MPADecodeContext),
82  .init = decode_init,
83  .close = decode_close,
85  .capabilities = AV_CODEC_CAP_DR1,
86  .flush = flush,
87  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
90 };
91 #endif
92 #if CONFIG_MP3ADUFLOAT_DECODER
93 AVCodec ff_mp3adufloat_decoder = {
94  .name = "mp3adufloat",
95  .long_name = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
96  .type = AVMEDIA_TYPE_AUDIO,
97  .id = AV_CODEC_ID_MP3ADU,
98  .priv_data_size = sizeof(MPADecodeContext),
99  .init = decode_init,
100  .close = decode_close,
101  .decode = decode_frame_adu,
102  .capabilities = AV_CODEC_CAP_DR1,
103  .flush = flush,
104  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
107 };
108 #endif
109 #if CONFIG_MP3ON4FLOAT_DECODER
110 AVCodec ff_mp3on4float_decoder = {
111  .name = "mp3on4float",
112  .long_name = NULL_IF_CONFIG_SMALL("MP3onMP4"),
113  .type = AVMEDIA_TYPE_AUDIO,
114  .id = AV_CODEC_ID_MP3ON4,
115  .priv_data_size = sizeof(MP3On4DecodeContext),
116  .init = decode_init_mp3on4,
117  .close = decode_close_mp3on4,
118  .decode = decode_frame_mp3on4,
119  .capabilities = AV_CODEC_CAP_DR1,
120  .flush = flush_mp3on4,
121  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
123 };
124 #endif
float, planar
Definition: samplefmt.h:69
static void flush(AVCodecContext *avctx)
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
MPEG Audio decoder.
AVCodec.
Definition: avcodec.h:3559
static av_cold int decode_init(AVCodecContext *avctx)
Definition: 4xm.c:981
static av_cold int decode_close(AVCodecContext *avctx)
Definition: ansi.c:464
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: 4xm.c:827
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:515
const char * name
Name of the codec implementation.
Definition: avcodec.h:3566
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:752
mpeg audio declarations for both encoder and decoder.
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:956