Corrections to channel coupling code to attain conformance for appropriate
[libav.git] / libavcodec / aac.h
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1/*
2 * AAC definitions and structures
3 * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
4 * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file aac.h
25 * AAC definitions and structures
26 * @author Oded Shimon ( ods15 ods15 dyndns org )
27 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
28 */
29
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30#ifndef AVCODEC_AAC_H
31#define AVCODEC_AAC_H
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32
33#include "avcodec.h"
34#include "dsputil.h"
35#include "mpeg4audio.h"
36
37#include <stdint.h>
38
39#define AAC_INIT_VLC_STATIC(num, size) \
40 INIT_VLC_STATIC(&vlc_spectral[num], 6, ff_aac_spectral_sizes[num], \
41 ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
42 ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
43 size);
44
cc0591da 45#define MAX_CHANNELS 64
9cc04edf 46#define MAX_ELEM_ID 16
cc0591da 47
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48#define TNS_MAX_ORDER 20
49#define PNS_MEAN_ENERGY 3719550720.0f // sqrt(3.0) * 1<<31
50
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51enum AudioObjectType {
52 AOT_NULL,
53 // Support? Name
54 AOT_AAC_MAIN, ///< Y Main
55 AOT_AAC_LC, ///< Y Low Complexity
56 AOT_AAC_SSR, ///< N (code in SoC repo) Scalable Sample Rate
57 AOT_AAC_LTP, ///< N (code in SoC repo) Long Term Prediction
58 AOT_SBR, ///< N (in progress) Spectral Band Replication
59 AOT_AAC_SCALABLE, ///< N Scalable
60 AOT_TWINVQ, ///< N Twin Vector Quantizer
61 AOT_CELP, ///< N Code Excited Linear Prediction
62 AOT_HVXC, ///< N Harmonic Vector eXcitation Coding
63 AOT_TTSI = 12, ///< N Text-To-Speech Interface
64 AOT_MAINSYNTH, ///< N Main Synthesis
65 AOT_WAVESYNTH, ///< N Wavetable Synthesis
66 AOT_MIDI, ///< N General MIDI
67 AOT_SAFX, ///< N Algorithmic Synthesis and Audio Effects
68 AOT_ER_AAC_LC, ///< N Error Resilient Low Complexity
69 AOT_ER_AAC_LTP = 19, ///< N Error Resilient Long Term Prediction
70 AOT_ER_AAC_SCALABLE, ///< N Error Resilient Scalable
71 AOT_ER_TWINVQ, ///< N Error Resilient Twin Vector Quantizer
72 AOT_ER_BSAC, ///< N Error Resilient Bit-Sliced Arithmetic Coding
73 AOT_ER_AAC_LD, ///< N Error Resilient Low Delay
74 AOT_ER_CELP, ///< N Error Resilient Code Excited Linear Prediction
75 AOT_ER_HVXC, ///< N Error Resilient Harmonic Vector eXcitation Coding
76 AOT_ER_HILN, ///< N Error Resilient Harmonic and Individual Lines plus Noise
77 AOT_ER_PARAM, ///< N Error Resilient Parametric
78 AOT_SSC, ///< N SinuSoidal Coding
79};
80
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81enum RawDataBlockType {
82 TYPE_SCE,
83 TYPE_CPE,
84 TYPE_CCE,
85 TYPE_LFE,
86 TYPE_DSE,
87 TYPE_PCE,
88 TYPE_FIL,
89 TYPE_END,
90};
91
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92enum ExtensionPayloadID {
93 EXT_FILL,
94 EXT_FILL_DATA,
95 EXT_DATA_ELEMENT,
96 EXT_DYNAMIC_RANGE = 0xb,
97 EXT_SBR_DATA = 0xd,
98 EXT_SBR_DATA_CRC = 0xe,
99};
100
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101enum WindowSequence {
102 ONLY_LONG_SEQUENCE,
103 LONG_START_SEQUENCE,
104 EIGHT_SHORT_SEQUENCE,
105 LONG_STOP_SEQUENCE,
106};
107
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108enum BandType {
109 ZERO_BT = 0, ///< Scalefactors and spectral data are all zero.
110 FIRST_PAIR_BT = 5, ///< This and later band types encode two values (rather than four) with one code word.
111 ESC_BT = 11, ///< Spectral data are coded with an escape sequence.
112 NOISE_BT = 13, ///< Spectral data are scaled white noise not coded in the bitstream.
113 INTENSITY_BT2 = 14, ///< Scalefactor data are intensity stereo positions.
114 INTENSITY_BT = 15, ///< Scalefactor data are intensity stereo positions.
115};
116
117#define IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10)
118
119enum ChannelPosition {
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120 AAC_CHANNEL_FRONT = 1,
121 AAC_CHANNEL_SIDE = 2,
122 AAC_CHANNEL_BACK = 3,
123 AAC_CHANNEL_LFE = 4,
124 AAC_CHANNEL_CC = 5,
125};
126
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127/**
128 * The point during decoding at which channel coupling is applied.
129 */
130enum CouplingPoint {
131 BEFORE_TNS,
132 BETWEEN_TNS_AND_IMDCT,
133 AFTER_IMDCT = 3,
134};
135
136/**
137 * Individual Channel Stream
138 */
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139typedef struct {
140 uint8_t max_sfb; ///< number of scalefactor bands per group
141 enum WindowSequence window_sequence[2];
142 uint8_t use_kb_window[2]; ///< If set, use Kaiser-Bessel window, otherwise use a sinus window.
143 int num_window_groups;
144 uint8_t group_len[8];
145 const uint16_t *swb_offset; ///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window
146 int num_swb; ///< number of scalefactor window bands
147 int num_windows;
148 int tns_max_bands;
149} IndividualChannelStream;
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150
151/**
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152 * Temporal Noise Shaping
153 */
154typedef struct {
155 int present;
156 int n_filt[8];
157 int length[8][4];
158 int direction[8][4];
159 int order[8][4];
160 float coef[8][4][TNS_MAX_ORDER];
161} TemporalNoiseShaping;
162
163/**
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164 * Dynamic Range Control - decoded from the bitstream but not processed further.
165 */
166typedef struct {
167 int pce_instance_tag; ///< Indicates with which program the DRC info is associated.
168 int dyn_rng_sgn[17]; ///< DRC sign information; 0 - positive, 1 - negative
169 int dyn_rng_ctl[17]; ///< DRC magnitude information
170 int exclude_mask[MAX_CHANNELS]; ///< Channels to be excluded from DRC processing.
171 int band_incr; ///< Number of DRC bands greater than 1 having DRC info.
172 int interpolation_scheme; ///< Indicates the interpolation scheme used in the SBR QMF domain.
173 int band_top[17]; ///< Indicates the top of the i-th DRC band in units of 4 spectral lines.
174 int prog_ref_level; /**< A reference level for the long-term program audio level for all
175 * channels combined.
176 */
177} DynamicRangeControl;
178
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179typedef struct {
180 int num_pulse;
848a5815 181 int pos[4];
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182 int amp[4];
183} Pulse;
184
185/**
186 * coupling parameters
187 */
188typedef struct {
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189 enum CouplingPoint coupling_point; ///< The point during decoding at which coupling is applied.
190 int num_coupled; ///< number of target elements
191 enum RawDataBlockType type[8]; ///< Type of channel element to be coupled - SCE or CPE.
192 int id_select[8]; ///< element id
193 int ch_select[8]; /**< [0] shared list of gains; [1] list of gains for left channel;
194 * [2] list of gains for right channel; [3] lists of gains for both channels
195 */
196 float gain[16][120];
197} ChannelCoupling;
198
199/**
200 * Single Channel Element - used for both SCE and LFE elements.
201 */
202typedef struct {
203 IndividualChannelStream ics;
204 TemporalNoiseShaping tns;
205 enum BandType band_type[120]; ///< band types
206 int band_type_run_end[120]; ///< band type run end points
207 float sf[120]; ///< scalefactors
208 DECLARE_ALIGNED_16(float, coeffs[1024]); ///< coefficients for IMDCT
b0f5852a 209 DECLARE_ALIGNED_16(float, saved[512]); ///< overlap
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210 DECLARE_ALIGNED_16(float, ret[1024]); ///< PCM output
211} SingleChannelElement;
212
213/**
214 * channel element - generic struct for SCE/CPE/CCE/LFE
215 */
216typedef struct {
217 // CPE specific
218 uint8_t ms_mask[120]; ///< Set if mid/side stereo is used for each scalefactor window band
219 // shared
220 SingleChannelElement ch[2];
221 // CCE specific
222 ChannelCoupling coup;
223} ChannelElement;
cc0591da 224
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225/**
226 * main AAC context
227 */
228typedef struct {
229 AVCodecContext * avccontext;
230
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231 MPEG4AudioConfig m4ac;
232
233 int is_saved; ///< Set if elements have stored overlap from previous frame.
234 DynamicRangeControl che_drc;
235
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236 /**
237 * @defgroup elements
238 * @{
239 */
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240 enum ChannelPosition che_pos[4][MAX_ELEM_ID]; /**< channel element channel mapping with the
241 * first index as the first 4 raw data block types
242 */
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243 ChannelElement * che[4][MAX_ELEM_ID];
244 /** @} */
cc0591da 245
589ce6e6 246 /**
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247 * @defgroup temporary aligned temporary buffers (We do not want to have these on the stack.)
248 * @{
249 */
b0f5852a 250 DECLARE_ALIGNED_16(float, buf_mdct[1024]);
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251 /** @} */
252
253 /**
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254 * @defgroup tables Computed / set up during initialization.
255 * @{
256 */
257 MDCTContext mdct;
258 MDCTContext mdct_small;
259 DSPContext dsp;
9cc04edf 260 int random_state;
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261 /** @} */
262
263 /**
cc0591da 264 * @defgroup output Members used for output interleaving.
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265 * @{
266 */
cc0591da 267 float *output_data[MAX_CHANNELS]; ///< Points to each element's 'ret' buffer (PCM output).
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268 float add_bias; ///< offset for dsp.float_to_int16
269 float sf_scale; ///< Pre-scale for correct IMDCT and dsp.float_to_int16.
270 int sf_offset; ///< offset into pow2sf_tab as appropriate for dsp.float_to_int16
271 /** @} */
272
273} AACContext;
274
98790382 275#endif /* AVCODEC_AAC_H */