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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
25  * AAC definitions and structures
26  * @author Oded Shimon ( ods15 ods15 dyndns org )
27  * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
28  */
29 
30 #ifndef AVCODEC_AAC_H
31 #define AVCODEC_AAC_H
32 
33 #include "libavutil/float_dsp.h"
34 #include "avcodec.h"
35 #include "imdct15.h"
36 #include "fft.h"
37 #include "mpeg4audio.h"
38 #include "sbr.h"
39 
40 #include <stdint.h>
41 
42 #define MAX_CHANNELS 64
43 #define MAX_ELEM_ID 16
44 
45 #define TNS_MAX_ORDER 20
46 #define MAX_LTP_LONG_SFB 40
47 
57 };
58 
64  EXT_SBR_DATA = 0xd,
66 };
67 
73 };
74 
75 enum BandType {
76  ZERO_BT = 0, ///< Scalefactors and spectral data are all zero.
77  FIRST_PAIR_BT = 5, ///< This and later band types encode two values (rather than four) with one code word.
78  ESC_BT = 11, ///< Spectral data are coded with an escape sequence.
79  NOISE_BT = 13, ///< Spectral data are scaled white noise not coded in the bitstream.
80  INTENSITY_BT2 = 14, ///< Scalefactor data are intensity stereo positions.
81  INTENSITY_BT = 15, ///< Scalefactor data are intensity stereo positions.
82 };
83 
84 #define IS_CODEBOOK_UNSIGNED(x) (((x) - 1) & 10)
85 
93 };
94 
95 /**
96  * The point during decoding at which channel coupling is applied.
97  */
102 };
103 
104 /**
105  * Output configuration status
106  */
107 enum OCStatus {
108  OC_NONE, ///< Output unconfigured
109  OC_TRIAL_PCE, ///< Output configuration under trial specified by an inband PCE
110  OC_TRIAL_FRAME, ///< Output configuration under trial specified by a frame header
111  OC_GLOBAL_HDR, ///< Output configuration set in a global header but not yet locked
112  OC_LOCKED, ///< Output configuration locked in place
113 };
114 
115 typedef struct OutputConfiguration {
119  int channels;
120  uint64_t channel_layout;
123 
124 /**
125  * Predictor State
126  */
127 typedef struct PredictorState {
128  float cor0;
129  float cor1;
130  float var0;
131  float var1;
132  float r0;
133  float r1;
135 
136 #define MAX_PREDICTORS 672
137 
138 #define SCALE_DIV_512 36 ///< scalefactor difference that corresponds to scale difference in 512 times
139 #define SCALE_ONE_POS 140 ///< scalefactor index that corresponds to scale=1.0
140 #define SCALE_MAX_POS 255 ///< scalefactor index maximum value
141 #define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard
142 #define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference
143 
144 #define NOISE_PRE 256 ///< preamble for NOISE_BT, put in bitstream with the first noise band
145 #define NOISE_PRE_BITS 9 ///< length of preamble
146 #define NOISE_OFFSET 90 ///< subtracted from global gain, used as offset for the preamble
147 
148 /**
149  * Long Term Prediction
150  */
151 typedef struct LongTermPrediction {
152  int8_t present;
153  int16_t lag;
154  float coef;
157 
158 /**
159  * Individual Channel Stream
160  */
161 typedef struct IndividualChannelStream {
162  uint8_t max_sfb; ///< number of scalefactor bands per group
164  uint8_t use_kb_window[2]; ///< If set, use Kaiser-Bessel window, otherwise use a sine window.
168  const uint16_t *swb_offset; ///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window
169  const uint8_t *swb_sizes; ///< table of scalefactor band sizes for a particular window
170  int num_swb; ///< number of scalefactor window bands
178 
179 /**
180  * Temporal Noise Shaping
181  */
182 typedef struct TemporalNoiseShaping {
183  int present;
184  int n_filt[8];
185  int length[8][4];
186  int direction[8][4];
187  int order[8][4];
188  float coef[8][4][TNS_MAX_ORDER];
190 
191 /**
192  * Dynamic Range Control - decoded from the bitstream but not processed further.
193  */
194 typedef struct DynamicRangeControl {
195  int pce_instance_tag; ///< Indicates with which program the DRC info is associated.
196  int dyn_rng_sgn[17]; ///< DRC sign information; 0 - positive, 1 - negative
197  int dyn_rng_ctl[17]; ///< DRC magnitude information
198  int exclude_mask[MAX_CHANNELS]; ///< Channels to be excluded from DRC processing.
199  int band_incr; ///< Number of DRC bands greater than 1 having DRC info.
200  int interpolation_scheme; ///< Indicates the interpolation scheme used in the SBR QMF domain.
201  int band_top[17]; ///< Indicates the top of the i-th DRC band in units of 4 spectral lines.
202  int prog_ref_level; /**< A reference level for the long-term program audio level for all
203  * channels combined.
204  */
206 
207 typedef struct Pulse {
209  int start;
210  int pos[4];
211  int amp[4];
212 } Pulse;
213 
214 /**
215  * coupling parameters
216  */
217 typedef struct ChannelCoupling {
218  enum CouplingPoint coupling_point; ///< The point during decoding at which coupling is applied.
219  int num_coupled; ///< number of target elements
220  enum RawDataBlockType type[8]; ///< Type of channel element to be coupled - SCE or CPE.
221  int id_select[8]; ///< element id
222  int ch_select[8]; /**< [0] shared list of gains; [1] list of gains for right channel;
223  * [2] list of gains for left channel; [3] lists of gains for both channels
224  */
225  float gain[16][120];
227 
228 /**
229  * Single Channel Element - used for both SCE and LFE elements.
230  */
231 typedef struct SingleChannelElement {
235  enum BandType band_type[128]; ///< band types
236  int band_type_run_end[120]; ///< band type run end points
237  float sf[120]; ///< scalefactors
238  int sf_idx[128]; ///< scalefactor indices (used by encoder)
239  uint8_t zeroes[128]; ///< band is not coded (used by encoder)
240  DECLARE_ALIGNED(32, float, pcoeffs)[1024]; ///< coefficients for IMDCT, pristine
241  DECLARE_ALIGNED(32, float, coeffs)[1024]; ///< coefficients for IMDCT, maybe processed
242  DECLARE_ALIGNED(32, float, saved)[1536]; ///< overlap
243  DECLARE_ALIGNED(32, float, ret_buf)[2048]; ///< PCM output buffer
244  DECLARE_ALIGNED(16, float, ltp_state)[3072]; ///< time signal for LTP
246  float *ret; ///< PCM output
248 
249 /**
250  * channel element - generic struct for SCE/CPE/CCE/LFE
251  */
252 typedef struct ChannelElement {
253  int present;
254  // CPE specific
255  int common_window; ///< Set if channels share a common 'IndividualChannelStream' in bitstream.
256  int ms_mode; ///< Signals mid/side stereo flags coding mode (used by encoder)
257  uint8_t ms_mask[128]; ///< Set if mid/side stereo is used for each scalefactor window band
258  // shared
260  // CCE specific
264 
265 /**
266  * main AAC context
267  */
268 struct AACContext {
269  AVClass *class;
272 
273  int is_saved; ///< Set if elements have stored overlap from previous frame.
275 
276  /**
277  * @name Channel element related data
278  * @{
279  */
284  /** @} */
285 
286  /**
287  * @name temporary aligned temporary buffers
288  * (We do not want to have these on the stack.)
289  * @{
290  */
291  DECLARE_ALIGNED(32, float, buf_mdct)[1024];
292  /** @} */
293 
294  /**
295  * @name Computed / set up during initialization
296  * @{
297  */
305  /** @} */
306 
307  /**
308  * @name Members used for output
309  * @{
310  */
311  SingleChannelElement *output_element[MAX_CHANNELS]; ///< Points to each SingleChannelElement
312  /** @} */
313 
314 
315  /**
316  * @name Japanese DTV specific extension
317  * @{
318  */
319  int force_dmono_mode;///< 0->not dmono, 1->use first channel, 2->use second channel
320  int dmono_mode; ///< 0->not dmono, 1->use first channel, 2->use second channel
321  /** @} */
322 
323  DECLARE_ALIGNED(32, float, temp)[128];
324 
327 
328  /* aacdec functions pointers */
331  void (*apply_tns)(float coef[1024], TemporalNoiseShaping *tns,
332  IndividualChannelStream *ics, int decode);
334  float *in, IndividualChannelStream *ics);
336 
337 };
338 
340 
341 #endif /* AVCODEC_AAC_H */
int predictor_initialized
Definition: aac.h:174
AVFloatDSPContext * fdsp
Definition: aac.h:303
Definition: aac.h:53
uint8_t use_kb_window[2]
If set, use Kaiser-Bessel window, otherwise use a sine window.
Definition: aac.h:164
IMDCT15Context * mdct480
Definition: aac.h:302
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
AVCodecContext * avctx
Definition: aac.h:270
Definition: aac.h:207
float pcoeffs[1024]
coefficients for IMDCT, pristine
Definition: aac.h:240
Definition: aac.h:56
Definition: aac.h:49
Definition: aac.h:50
ChannelElement * che[4][MAX_ELEM_ID]
Definition: aac.h:280
float cor1
Definition: aac.h:129
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:53
int present
Definition: aac.h:253
int common_window
Set if channels share a common 'IndividualChannelStream' in bitstream.
Definition: aac.h:255
void(* update_ltp)(AACContext *ac, SingleChannelElement *sce)
Definition: aac.h:335
void(* imdct_and_windowing)(AACContext *ac, SingleChannelElement *sce)
Definition: aac.h:329
uint64_t channel_layout
Definition: aac.h:120
uint8_t ms_mask[128]
Set if mid/side stereo is used for each scalefactor window band.
Definition: aac.h:257
#define MAX_LTP_LONG_SFB
Definition: aac.h:46
Dynamic Range Control - decoded from the bitstream but not processed further.
Definition: aac.h:194
float coef[8][4][TNS_MAX_ORDER]
Definition: aac.h:188
ChannelPosition
Definition: aac.h:86
Spectral data are scaled white noise not coded in the bitstream.
Definition: aac.h:79
Definition: aac.h:51
int band_incr
Number of DRC bands greater than 1 having DRC info.
Definition: aac.h:199
int dmono_mode
0->not dmono, 1->use first channel, 2->use second channel
Definition: aac.h:320
const uint16_t * swb_offset
table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular wind...
Definition: aac.h:168
Definition: aac.h:60
BandType
Definition: aac.h:75
uint8_t
uint8_t layout_map[MAX_ELEM_ID *4][3]
Definition: aac.h:117
float saved[1536]
overlap
Definition: aac.h:242
Output configuration under trial specified by an inband PCE.
Definition: aac.h:109
SingleChannelElement ch[2]
Definition: aac.h:259
Definition: aac.h:52
TemporalNoiseShaping tns
Definition: aac.h:233
CouplingPoint
The point during decoding at which channel coupling is applied.
Definition: aac.h:98
int num_coupled
number of target elements
Definition: aac.h:219
int exclude_mask[MAX_CHANNELS]
Channels to be excluded from DRC processing.
Definition: aac.h:198
int n_filt[8]
Definition: aac.h:184
FFTContext mdct_ltp
Definition: aac.h:301
SingleChannelElement * output_element[MAX_CHANNELS]
Points to each SingleChannelElement.
Definition: aac.h:311
Scalefactor data are intensity stereo positions.
Definition: aac.h:81
int id_select[8]
element id
Definition: aac.h:221
ChannelElement * tag_che_map[4][MAX_ELEM_ID]
Definition: aac.h:281
Output configuration set in a global header but not yet locked.
Definition: aac.h:111
int random_state
Definition: aac.h:304
float var1
Definition: aac.h:131
MPEG4AudioConfig m4ac
Definition: aac.h:116
int dyn_rng_sgn[17]
DRC sign information; 0 - positive, 1 - negative.
Definition: aac.h:196
float coeffs[1024]
coefficients for IMDCT, maybe processed
Definition: aac.h:241
PredictorState predictor_state[MAX_PREDICTORS]
Definition: aac.h:245
SpectralBandReplication sbr
Definition: aac.h:262
FFTContext mdct_small
Definition: aac.h:299
enum CouplingPoint coupling_point
The point during decoding at which coupling is applied.
Definition: aac.h:218
ExtensionPayloadID
Definition: aac.h:59
Spectral Band Replication definitions and structures.
int amp[4]
Definition: aac.h:211
GLsizei GLsizei * length
Definition: opengl_enc.c:115
float temp[128]
Definition: aac.h:323
uint8_t max_sfb
number of scalefactor bands per group
Definition: aac.h:162
Definition: aac.h:55
WindowSequence
Definition: aac.h:68
int num_swb
number of scalefactor window bands
Definition: aac.h:170
Libavcodec external API header.
int prog_ref_level
A reference level for the long-term program audio level for all channels combined.
Definition: aac.h:202
Output configuration locked in place.
Definition: aac.h:112
Predictor State.
Definition: aac.h:127
int warned_remapping_once
Definition: aac.h:283
Definition: fft.h:88
enum WindowSequence window_sequence[2]
Definition: aac.h:163
int predictor_reset_group
Definition: aac.h:175
int dyn_rng_ctl[17]
DRC magnitude information.
Definition: aac.h:197
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int pos[4]
Definition: aac.h:210
float var0
Definition: aac.h:130
FFTContext mdct_ld
Definition: aac.h:300
void ff_aacdec_init_mips(AACContext *c)
Definition: aacdec_mips.c:433
int pce_instance_tag
Indicates with which program the DRC info is associated.
Definition: aac.h:195
int interpolation_scheme
Indicates the interpolation scheme used in the SBR QMF domain.
Definition: aac.h:200
coupling parameters
Definition: aac.h:217
int tags_mapped
Definition: aac.h:282
int ch_select[8]
[0] shared list of gains; [1] list of gains for right channel; [2] list of gains for left channel; [3...
Definition: aac.h:222
float coef
Definition: aac.h:154
int force_dmono_mode
0->not dmono, 1->use first channel, 2->use second channel
Definition: aac.h:319
int is_saved
Set if elements have stored overlap from previous frame.
Definition: aac.h:273
int order[8][4]
Definition: aac.h:187
int warned_num_aac_frames
Definition: aac.h:326
Temporal Noise Shaping.
Definition: aac.h:182
Long Term Prediction.
Definition: aac.h:151
main external API structure.
Definition: avcodec.h:1241
IndividualChannelStream ics
Definition: aac.h:232
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
#define MAX_PREDICTORS
Definition: aac.h:136
GLint GLenum type
Definition: opengl_enc.c:105
uint8_t group_len[8]
Definition: aac.h:166
#define MAX_ELEM_ID
Definition: aac.h:43
Describe the class of an AVClass context structure.
Definition: log.h:67
Spectral data are coded with an escape sequence.
Definition: aac.h:78
const uint8_t * swb_sizes
table of scalefactor band sizes for a particular window
Definition: aac.h:169
OCStatus
Output configuration status.
Definition: aac.h:107
#define MAX_CHANNELS
Definition: aac.h:42
float * ret
PCM output.
Definition: aac.h:246
#define TNS_MAX_ORDER
Definition: aac.h:45
main AAC context
Definition: aac.h:268
LongTermPrediction ltp
Definition: aac.h:167
ChannelCoupling coup
Definition: aac.h:261
int ms_mode
Signals mid/side stereo flags coding mode (used by encoder)
Definition: aac.h:256
float gain[16][120]
Definition: aac.h:225
Output configuration under trial specified by a frame header.
Definition: aac.h:110
float ltp_state[3072]
time signal for LTP
Definition: aac.h:244
uint8_t zeroes[128]
band is not coded (used by encoder)
Definition: aac.h:239
int band_type_run_end[120]
band type run end points
Definition: aac.h:236
float sf[120]
scalefactors
Definition: aac.h:237
int sf_idx[128]
scalefactor indices (used by encoder)
Definition: aac.h:238
int band_top[17]
Indicates the top of the i-th DRC band in units of 4 spectral lines.
Definition: aac.h:201
enum OCStatus status
Definition: aac.h:121
Scalefactor data are intensity stereo positions.
Definition: aac.h:80
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:522
int16_t lag
Definition: aac.h:153
DynamicRangeControl che_drc
Definition: aac.h:274
AVFrame * frame
Definition: aac.h:271
OutputConfiguration oc[2]
Definition: aac.h:325
int direction[8][4]
Definition: aac.h:186
void(* apply_ltp)(AACContext *ac, SingleChannelElement *sce)
Definition: aac.h:330
uint8_t prediction_used[41]
Definition: aac.h:176
Single Channel Element - used for both SCE and LFE elements.
Definition: aac.h:231
static double c[64]
Definition: aac.h:54
Individual Channel Stream.
Definition: aac.h:161
channel element - generic struct for SCE/CPE/CCE/LFE
Definition: aac.h:252
void(* windowing_and_mdct_ltp)(AACContext *ac, float *out, float *in, IndividualChannelStream *ics)
Definition: aac.h:333
int start
Definition: aac.h:209
float r1
Definition: aac.h:133
Scalefactors and spectral data are all zero.
Definition: aac.h:76
int num_pulse
Definition: aac.h:208
void(* apply_tns)(float coef[1024], TemporalNoiseShaping *tns, IndividualChannelStream *ics, int decode)
Definition: aac.h:331
float cor0
Definition: aac.h:128
enum BandType band_type[128]
band types
Definition: aac.h:235
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
float ret_buf[2048]
PCM output buffer.
Definition: aac.h:243
FFTContext mdct
Definition: aac.h:298
float r0
Definition: aac.h:132
int8_t used[MAX_LTP_LONG_SFB]
Definition: aac.h:155
int8_t present
Definition: aac.h:152
Definition: aac.h:99
Spectral Band Replication.
Definition: sbr.h:137
int layout_map_tags
Definition: aac.h:118
float buf_mdct[1024]
Definition: aac.h:291
Output unconfigured.
Definition: aac.h:108
This and later band types encode two values (rather than four) with one code word.
Definition: aac.h:77
RawDataBlockType
Definition: aac.h:48