Add missing #includes for avutil.h, required for the AV_VERSION* macros.
[ffmpeg-lucabe.git] / libavcodec / mpegaudio.h
blobd3bf1539b2cd60ac273ace6f40a6dc1752c6979d
1 /*
2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
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
21 /**
22 * @file libavcodec/mpegaudio.h
23 * mpeg audio declarations for both encoder and decoder.
26 #ifndef AVCODEC_MPEGAUDIO_H
27 #define AVCODEC_MPEGAUDIO_H
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "dsputil.h"
33 #define CONFIG_AUDIO_NONSHORT 0
35 /* max frame size, in samples */
36 #define MPA_FRAME_SIZE 1152
38 /* max compressed frame size */
39 #define MPA_MAX_CODED_FRAME_SIZE 1792
41 #define MPA_MAX_CHANNELS 2
43 #define SBLIMIT 32 /* number of subbands */
45 #define MPA_STEREO 0
46 #define MPA_JSTEREO 1
47 #define MPA_DUAL 2
48 #define MPA_MONO 3
50 /* header + layer + bitrate + freq + lsf/mpeg25 */
51 #define SAME_HEADER_MASK \
52 (0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
54 #define MP3_MASK 0xFFFE0CCF
56 #if CONFIG_MPEGAUDIO_HP
57 #define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
58 #define WFRAC_BITS 16 /* fractional bits for window */
59 #else
60 #define FRAC_BITS 15 /* fractional bits for sb_samples and dct */
61 #define WFRAC_BITS 14 /* fractional bits for window */
62 #endif
64 #define FRAC_ONE (1 << FRAC_BITS)
66 #define FIX(a) ((int)((a) * FRAC_ONE))
68 #if CONFIG_MPEGAUDIO_HP && CONFIG_AUDIO_NONSHORT
69 typedef int32_t OUT_INT;
70 #define OUT_MAX INT32_MAX
71 #define OUT_MIN INT32_MIN
72 #define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 31)
73 #define OUT_FMT SAMPLE_FMT_S32
74 #else
75 typedef int16_t OUT_INT;
76 #define OUT_MAX INT16_MAX
77 #define OUT_MIN INT16_MIN
78 #define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15)
79 #define OUT_FMT SAMPLE_FMT_S16
80 #endif
82 #if FRAC_BITS <= 15
83 typedef int16_t MPA_INT;
84 #else
85 typedef int32_t MPA_INT;
86 #endif
88 #define BACKSTEP_SIZE 512
89 #define EXTRABYTES 24
91 /* layer 3 "granule" */
92 typedef struct GranuleDef {
93 uint8_t scfsi;
94 int part2_3_length;
95 int big_values;
96 int global_gain;
97 int scalefac_compress;
98 uint8_t block_type;
99 uint8_t switch_point;
100 int table_select[3];
101 int subblock_gain[3];
102 uint8_t scalefac_scale;
103 uint8_t count1table_select;
104 int region_size[3]; /* number of huffman codes in each region */
105 int preflag;
106 int short_start, long_end; /* long/short band indexes */
107 uint8_t scale_factors[40];
108 int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
109 } GranuleDef;
111 #define MPA_DECODE_HEADER \
112 int frame_size; \
113 int error_protection; \
114 int layer; \
115 int sample_rate; \
116 int sample_rate_index; /* between 0 and 8 */ \
117 int bit_rate; \
118 int nb_channels; \
119 int mode; \
120 int mode_ext; \
121 int lsf;
123 typedef struct MPADecodeHeader {
124 MPA_DECODE_HEADER
125 } MPADecodeHeader;
127 typedef struct MPADecodeContext {
128 MPA_DECODE_HEADER
129 uint8_t last_buf[2*BACKSTEP_SIZE + EXTRABYTES];
130 int last_buf_size;
131 /* next header (used in free format parsing) */
132 uint32_t free_format_next_header;
133 GetBitContext gb;
134 GetBitContext in_gb;
135 DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512 * 2]);
136 int synth_buf_offset[MPA_MAX_CHANNELS];
137 DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]);
138 int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
139 GranuleDef granules[2][2]; /* Used in Layer 3 */
140 #ifdef DEBUG
141 int frame_count;
142 #endif
143 void (*compute_antialias)(struct MPADecodeContext *s, struct GranuleDef *g);
144 int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
145 int dither_state;
146 int error_recognition;
147 AVCodecContext* avctx;
148 } MPADecodeContext;
150 /* layer 3 huffman tables */
151 typedef struct HuffTable {
152 int xsize;
153 const uint8_t *bits;
154 const uint16_t *codes;
155 } HuffTable;
157 int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
158 int ff_mpa_decode_header(AVCodecContext *avctx, uint32_t head, int *sample_rate, int *channels, int *frame_size, int *bitrate);
159 extern MPA_INT ff_mpa_synth_window[];
160 void ff_mpa_synth_init(MPA_INT *window);
161 void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
162 MPA_INT *window, int *dither_state,
163 OUT_INT *samples, int incr,
164 int32_t sb_samples[SBLIMIT]);
166 /* fast header check for resync */
167 static inline int ff_mpa_check_header(uint32_t header){
168 /* header */
169 if ((header & 0xffe00000) != 0xffe00000)
170 return -1;
171 /* layer check */
172 if ((header & (3<<17)) == 0)
173 return -1;
174 /* bit rate */
175 if ((header & (0xf<<12)) == 0xf<<12)
176 return -1;
177 /* frequency */
178 if ((header & (3<<10)) == 3<<10)
179 return -1;
180 return 0;
183 #endif /* AVCODEC_MPEGAUDIO_H */