virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-01-03 05:10:03 +02:00
Code Issues Releases Activity

aacdec: template TNS application separately

Browse Source
This commit is contained in:
Lynne 2024-03-13 22:20:59 +01:00
parent ad16349f9b
commit db5128ef70
No known key found for this signature in database
GPG Key ID: A2FEA5F03F034464
4 changed files with 71 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
libavcodec/aac/aacdec_dsp_template.c
View File

@ -31,6 +31,7 @@
#include "libavcodec/aacdec.h"
#include "libavcodec/aac_defines.h"
#include "libavcodec/lpc_functions.h"
#include "libavcodec/aactab.h"
@ -174,8 +175,72 @@ static void AAC_RENAME(apply_intensity_stereo)(AACDecContext *ac,
}
}
/**
* Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.
*
* @param decode 1 if tool is used normally, 0 if tool is used in LTP.
* @param coef spectral coefficients
*/
static void AAC_RENAME(apply_tns)(void *_coef_param, TemporalNoiseShaping *tns,
IndividualChannelStream *ics, int decode)
{
const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
int w, filt, m, i;
int bottom, top, order, start, end, size, inc;
INTFLOAT *coef_param = _coef_param;
INTFLOAT lpc[TNS_MAX_ORDER];
INTFLOAT tmp[TNS_MAX_ORDER+1];
UINTFLOAT *coef = coef_param;
if(!mmm)
return;
for (w = 0; w < ics->num_windows; w++) {
bottom = ics->num_swb;
for (filt = 0; filt < tns->n_filt[w]; filt++) {
top = bottom;
bottom = FFMAX(0, top - tns->length[w][filt]);
order = tns->order[w][filt];
if (order == 0)
continue;
// tns_decode_coef
compute_lpc_coefs(tns->AAC_RENAME(coef)[w][filt], order, lpc, 0, 0, 0);
start = ics->swb_offset[FFMIN(bottom, mmm)];
end = ics->swb_offset[FFMIN( top, mmm)];
if ((size = end - start) <= 0)
continue;
if (tns->direction[w][filt]) {
inc = -1;
start = end - 1;
} else {
inc = 1;
}
start += w * 128;
if (decode) {
// ar filter
for (m = 0; m < size; m++, start += inc)
for (i = 1; i <= FFMIN(m, order); i++)
coef[start] -= AAC_MUL26((INTFLOAT)coef[start - i * inc], lpc[i - 1]);
} else {
// ma filter
for (m = 0; m < size; m++, start += inc) {
tmp[0] = coef[start];
for (i = 1; i <= FFMIN(m, order); i++)
coef[start] += AAC_MUL26(tmp[i], lpc[i - 1]);
for (i = order; i > 0; i--)
tmp[i] = tmp[i - 1];
}
}
}
}
}
const AACDecDSP AAC_RENAME(aac_dsp) = {
.dequant_scalefactors = &AAC_RENAME(dequant_scalefactors),
.apply_mid_side_stereo = &AAC_RENAME(apply_mid_side_stereo),
.apply_intensity_stereo = &AAC_RENAME(apply_intensity_stereo),
.apply_tns = &AAC_RENAME(apply_tns),
};

6
libavcodec/aacdec.h
View File

@ -311,12 +311,6 @@ struct AACDecContext {
/* aacdec functions pointers */
void (*imdct_and_windowing)(struct AACDecContext *ac, SingleChannelElement *sce);
void (*apply_ltp)(struct AACDecContext *ac, SingleChannelElement *sce);
union {
void (*apply_tns)(float coef[1024], TemporalNoiseShaping *tns,
IndividualChannelStream *ics, int decode);
void (*apply_tns_fixed)(int coef[1024], TemporalNoiseShaping *tns,
IndividualChannelStream *ics, int decode);
};
union {
void (*windowing_and_mdct_ltp)(struct AACDecContext *ac, float *out,
float *in, IndividualChannelStream *ics);

73
libavcodec/aacdec_template.c
View File

@ -2367,68 +2367,6 @@ static int decode_extension_payload(AACDecContext *ac, GetBitContext *gb, int cn
return res;
}
/**
* Decode Temporal Noise Shaping filter coefficients and apply all-pole filters; reference: 4.6.9.3.
*
* @param decode 1 if tool is used normally, 0 if tool is used in LTP.
* @param coef spectral coefficients
*/
static void apply_tns(INTFLOAT coef_param[1024], TemporalNoiseShaping *tns,
IndividualChannelStream *ics, int decode)
{
const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
int w, filt, m, i;
int bottom, top, order, start, end, size, inc;
INTFLOAT lpc[TNS_MAX_ORDER];
INTFLOAT tmp[TNS_MAX_ORDER+1];
UINTFLOAT *coef = coef_param;
if(!mmm)
return;
for (w = 0; w < ics->num_windows; w++) {
bottom = ics->num_swb;
for (filt = 0; filt < tns->n_filt[w]; filt++) {
top = bottom;
bottom = FFMAX(0, top - tns->length[w][filt]);
order = tns->order[w][filt];
if (order == 0)
continue;
// tns_decode_coef
compute_lpc_coefs(tns->AAC_RENAME(coef)[w][filt], order, lpc, 0, 0, 0);
start = ics->swb_offset[FFMIN(bottom, mmm)];
end = ics->swb_offset[FFMIN( top, mmm)];
if ((size = end - start) <= 0)
continue;
if (tns->direction[w][filt]) {
inc = -1;
start = end - 1;
} else {
inc = 1;
}
start += w * 128;
if (decode) {
// ar filter
for (m = 0; m < size; m++, start += inc)
for (i = 1; i <= FFMIN(m, order); i++)
coef[start] -= AAC_MUL26((INTFLOAT)coef[start - i * inc], lpc[i - 1]);
} else {
// ma filter
for (m = 0; m < size; m++, start += inc) {
tmp[0] = coef[start];
for (i = 1; i <= FFMIN(m, order); i++)
coef[start] += AAC_MUL26(tmp[i], lpc[i - 1]);
for (i = order; i > 0; i--)
tmp[i] = tmp[i - 1];
}
}
}
}
}
/**
* Apply windowing and MDCT to obtain the spectral
* coefficient from the predicted sample by LTP.
@ -2479,7 +2417,7 @@ static void apply_ltp(AACDecContext *ac, SingleChannelElement *sce)
ac->AAC_RENAME(windowing_and_mdct_ltp)(ac, predFreq, predTime, &sce->ics);
if (sce->tns.present)
ac->AAC_RENAME(apply_tns)(predFreq, &sce->tns, &sce->ics, 0);
ac->dsp.apply_tns(predFreq, &sce->tns, &sce->ics, 0);
for (sfb = 0; sfb < FFMIN(sce->ics.max_sfb, MAX_LTP_LONG_SFB); sfb++)
if (ltp->used[sfb])
@ -2815,11 +2753,11 @@ static void spectral_to_sample(AACDecContext *ac, int samples)
}
}
if (che->ch[0].tns.present)
ac->AAC_RENAME(apply_tns)(che->ch[0].AAC_RENAME(coeffs),
&che->ch[0].tns, &che->ch[0].ics, 1);
ac->dsp.apply_tns(che->ch[0].AAC_RENAME(coeffs),
&che->ch[0].tns, &che->ch[0].ics, 1);
if (che->ch[1].tns.present)
ac->AAC_RENAME(apply_tns)(che->ch[1].AAC_RENAME(coeffs),
&che->ch[1].tns, &che->ch[1].ics, 1);
ac->dsp.apply_tns(che->ch[1].AAC_RENAME(coeffs),
&che->ch[1].tns, &che->ch[1].ics, 1);
if (type <= TYPE_CPE)
apply_channel_coupling(ac, che, type, i, BETWEEN_TNS_AND_IMDCT, AAC_RENAME(apply_dependent_coupling));
if (type != TYPE_CCE || che->coup.coupling_point == AFTER_IMDCT) {
@ -3272,7 +3210,6 @@ static void aacdec_init(AACDecContext *c)
{
c->imdct_and_windowing = imdct_and_windowing;
c->apply_ltp = apply_ltp;
c->AAC_RENAME(apply_tns) = apply_tns;
c->AAC_RENAME(windowing_and_mdct_ltp) = windowing_and_mdct_ltp;
c->update_ltp = update_ltp;
#if USE_FIXED

2
libavcodec/mips/aacdec_mips.c
View File

@ -275,7 +275,7 @@ static void apply_ltp_mips(AACDecContext *ac, SingleChannelElement *sce)
ac->windowing_and_mdct_ltp(ac, predFreq, predTime, &sce->ics);
if (sce->tns.present)
ac->apply_tns(predFreq, &sce->tns, &sce->ics, 0);
ac->dsp.apply_tns(predFreq, &sce->tns, &sce->ics, 0);
for (sfb = 0; sfb < FFMIN(sce->ics.max_sfb, MAX_LTP_LONG_SFB); sfb++)
if (ltp->used[sfb])