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Linshizhi
ffmpeg.wasm-core
Commits
ead15f1d
Commit
ead15f1d
authored
Feb 14, 2011
by
Young Han Lee
Committed by
Alex Converse
Feb 15, 2011
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aacdec: Implement LTP support.
Ported from gsoc svn.
parent
77c330a0
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Showing
4 changed files
with
178 additions
and
20 deletions
+178
-20
aac.h
libavcodec/aac.h
+23
-9
aacdec.c
libavcodec/aacdec.c
+146
-10
aacdectab.h
libavcodec/aacdectab.h
+8
-0
mpeg4audio.h
libavcodec/mpeg4audio.h
+1
-1
No files found.
libavcodec/aac.h
View file @
ead15f1d
...
@@ -43,6 +43,7 @@
...
@@ -43,6 +43,7 @@
#define MAX_ELEM_ID 16
#define MAX_ELEM_ID 16
#define TNS_MAX_ORDER 20
#define TNS_MAX_ORDER 20
#define MAX_LTP_LONG_SFB 40
enum
RawDataBlockType
{
enum
RawDataBlockType
{
TYPE_SCE
,
TYPE_SCE
,
...
@@ -130,6 +131,16 @@ typedef struct {
...
@@ -130,6 +131,16 @@ typedef struct {
#define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard
#define SCALE_MAX_DIFF 60 ///< maximum scalefactor difference allowed by standard
#define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference
#define SCALE_DIFF_ZERO 60 ///< codebook index corresponding to zero scalefactor indices difference
/**
* Long Term Prediction
*/
typedef
struct
{
int8_t
present
;
int16_t
lag
;
float
coef
;
int8_t
used
[
MAX_LTP_LONG_SFB
];
}
LongTermPrediction
;
/**
/**
* Individual Channel Stream
* Individual Channel Stream
*/
*/
...
@@ -139,6 +150,7 @@ typedef struct {
...
@@ -139,6 +150,7 @@ typedef struct {
uint8_t
use_kb_window
[
2
];
///< If set, use Kaiser-Bessel window, otherwise use a sinus window.
uint8_t
use_kb_window
[
2
];
///< If set, use Kaiser-Bessel window, otherwise use a sinus window.
int
num_window_groups
;
int
num_window_groups
;
uint8_t
group_len
[
8
];
uint8_t
group_len
[
8
];
LongTermPrediction
ltp
;
const
uint16_t
*
swb_offset
;
///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window
const
uint16_t
*
swb_offset
;
///< table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window
const
uint8_t
*
swb_sizes
;
///< table of scalefactor band sizes for a particular window
const
uint8_t
*
swb_sizes
;
///< table of scalefactor band sizes for a particular window
int
num_swb
;
///< number of scalefactor window bands
int
num_swb
;
///< number of scalefactor window bands
...
@@ -206,14 +218,15 @@ typedef struct {
...
@@ -206,14 +218,15 @@ typedef struct {
IndividualChannelStream
ics
;
IndividualChannelStream
ics
;
TemporalNoiseShaping
tns
;
TemporalNoiseShaping
tns
;
Pulse
pulse
;
Pulse
pulse
;
enum
BandType
band_type
[
128
];
///< band types
enum
BandType
band_type
[
128
];
///< band types
int
band_type_run_end
[
120
];
///< band type run end points
int
band_type_run_end
[
120
];
///< band type run end points
float
sf
[
120
];
///< scalefactors
float
sf
[
120
];
///< scalefactors
int
sf_idx
[
128
];
///< scalefactor indices (used by encoder)
int
sf_idx
[
128
];
///< scalefactor indices (used by encoder)
uint8_t
zeroes
[
128
];
///< band is not coded (used by encoder)
uint8_t
zeroes
[
128
];
///< band is not coded (used by encoder)
DECLARE_ALIGNED
(
16
,
float
,
coeffs
)[
1024
];
///< coefficients for IMDCT
DECLARE_ALIGNED
(
16
,
float
,
coeffs
)[
1024
];
///< coefficients for IMDCT
DECLARE_ALIGNED
(
16
,
float
,
saved
)[
1024
];
///< overlap
DECLARE_ALIGNED
(
16
,
float
,
saved
)[
1024
];
///< overlap
DECLARE_ALIGNED
(
16
,
float
,
ret
)[
2048
];
///< PCM output
DECLARE_ALIGNED
(
16
,
float
,
ret
)[
2048
];
///< PCM output
DECLARE_ALIGNED
(
16
,
int16_t
,
ltp_state
)[
3072
];
///< time signal for LTP
PredictorState
predictor_state
[
MAX_PREDICTORS
];
PredictorState
predictor_state
[
MAX_PREDICTORS
];
}
SingleChannelElement
;
}
SingleChannelElement
;
...
@@ -259,7 +272,7 @@ typedef struct {
...
@@ -259,7 +272,7 @@ typedef struct {
* @defgroup temporary aligned temporary buffers (We do not want to have these on the stack.)
* @defgroup temporary aligned temporary buffers (We do not want to have these on the stack.)
* @{
* @{
*/
*/
DECLARE_ALIGNED
(
16
,
float
,
buf_mdct
)[
1024
];
DECLARE_ALIGNED
(
16
,
float
,
buf_mdct
)[
2048
];
/** @} */
/** @} */
/**
/**
...
@@ -268,6 +281,7 @@ typedef struct {
...
@@ -268,6 +281,7 @@ typedef struct {
*/
*/
FFTContext
mdct
;
FFTContext
mdct
;
FFTContext
mdct_small
;
FFTContext
mdct_small
;
FFTContext
mdct_ltp
;
DSPContext
dsp
;
DSPContext
dsp
;
FmtConvertContext
fmt_conv
;
FmtConvertContext
fmt_conv
;
int
random_state
;
int
random_state
;
...
...
libavcodec/aacdec.c
View file @
ead15f1d
This diff is collapsed.
Click to expand it.
libavcodec/aacdectab.h
View file @
ead15f1d
...
@@ -35,6 +35,14 @@
...
@@ -35,6 +35,14 @@
#include <stdint.h>
#include <stdint.h>
/* @name ltp_coef
* Table of the LTP coefficient (multiplied by 2)
*/
static
const
float
ltp_coef
[
8
]
=
{
1
.
141658
,
1
.
393232
,
1
.
626008
,
1
.
822608
,
1
.
969800
,
2
.
135788
,
2
.
2389202
,
2
.
739066
,
};
/* @name tns_tmp2_map
/* @name tns_tmp2_map
* Tables of the tmp2[] arrays of LPC coefficients used for TNS.
* Tables of the tmp2[] arrays of LPC coefficients used for TNS.
* The suffix _M_N[] indicate the values of coef_compress and coef_res
* The suffix _M_N[] indicate the values of coef_compress and coef_res
...
...
libavcodec/mpeg4audio.h
View file @
ead15f1d
...
@@ -57,7 +57,7 @@ enum AudioObjectType {
...
@@ -57,7 +57,7 @@ enum AudioObjectType {
AOT_AAC_MAIN
,
///< Y Main
AOT_AAC_MAIN
,
///< Y Main
AOT_AAC_LC
,
///< Y Low Complexity
AOT_AAC_LC
,
///< Y Low Complexity
AOT_AAC_SSR
,
///< N (code in SoC repo) Scalable Sample Rate
AOT_AAC_SSR
,
///< N (code in SoC repo) Scalable Sample Rate
AOT_AAC_LTP
,
///<
N (code in SoC repo)
Long Term Prediction
AOT_AAC_LTP
,
///<
Y
Long Term Prediction
AOT_SBR
,
///< Y Spectral Band Replication
AOT_SBR
,
///< Y Spectral Band Replication
AOT_AAC_SCALABLE
,
///< N Scalable
AOT_AAC_SCALABLE
,
///< N Scalable
AOT_TWINVQ
,
///< N Twin Vector Quantizer
AOT_TWINVQ
,
///< N Twin Vector Quantizer
...
...
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